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The application of anti-yellowing agent on indoor shoes to maintain cleanliness and beauty in the home environment

3月 16th, 2025 News

Anti-yellowing agent for soles: Keep indoor shoes fresh and fresh

Introduction: Invisible Guardians in Home Environment

In modern home life, a pair of neat and beautiful indoor shoes are not only a symbol of comfortable life, but also an important reflection of family taste. However, over time, the soles of indoor shoes often experience troublesome “yellowing” phenomena. This change not only affects the overall appearance of the shoe, but also can disrupt the carefully created family atmosphere. To solve this problem, anti-yellowing agents in the sole came into being and became an invisible guardian for maintaining the clean and beautiful home environment.

The anti-yellowing agent of soles is a chemical additive specially developed for the yellowing problem of rubber, TPR and other materials. It effectively delays or prevents color changes in the sole material by inhibiting the photooxidation reaction and the thermal oxidation reaction. In daily home environments, various factors such as ultraviolet radiation, air pollution, and temperature changes may cause the sole material to age and turn yellow. Anti-yellowing agents are like a strong protective barrier, isolating these adverse factors and keeping indoor shoes as fresh as ever.

This article will deeply explore the application value of anti-yellowing agents in indoor shoes from multiple angles. First, we will analyze the working principle of the anti-yellowing agent and its performance on different materials; secondly, we will show its actual effect by comparing experimental data; then, we will provide scientific and reasonable use suggestions based on home use scenarios. I hope that through the explanation of this article, it can help readers better understand and use this technological innovation and add more beautiful experiences to family life.

The mechanism and working principle of anti-yellowing agent

The reason why anti-yellowing agents in the sole can effectively prevent yellowing is mainly due to their unique chemical action mechanism. From a microscopic perspective, anti-yellowing agents mainly play a role in two ways: first, the free radical capture function, and second, the improvement of antioxidant capacity. These two mechanisms of action cooperate with each other to jointly build an effective defense line against yellowing.

Free radical capture function

When rubber or TPR material is exposed to air, oxygen molecules will react with unsaturated bonds in the material to generate reactive oxygen radicals. These free radicals are the main culprits in the yellowing process. Specific chemical components in anti-yellowing agents are able to actively capture these free radicals, converting them into stable compounds, thereby blocking the yellowing reaction chain. This process is like deploying an elite force on the battlefield, ready to destroy the invading enemies at any time.

Specifically, the hydroxy compounds in the anti-yellowing agent will preferentially react with free radicals to form a more stable structure. For example, commonly used benzotriazole anti-yellowing agents have this property. They consume potential harmful substances by reacting with free radicals, while converting themselves into stable byproducts. This mechanism of sacrificing self-protection in the overall system ensures that the sole material can maintain its original color for a long time.

Improving antioxidant capacity

ExceptIn addition to directly capturing free radicals, anti-yellowing agents can also significantly improve the antioxidant capacity of the material itself. This is mainly achieved through two aspects: one is to enhance the antioxidant network structure inside the material; the other is to improve the UV resistance on the surface of the material. By establishing multiple protective systems at the molecular level, anti-yellowing agents can effectively delay the aging process of the material.

In practical applications, anti-yellowing agents are usually present in sole materials in a uniformly dispersed form. When the material is stimulated by external stimulation, the anti-yellowing agent responds quickly, releasing antioxidant factors. These factors are able to react with the oxidation products in the material to form a stable complex, thereby preventing further oxidation reactions. This continuous protection mechanism allows the sole to maintain a good appearance even after a long period of use.

Multiple Protection Mechanism

It is worth mentioning that high-quality anti-yellowing agents often have multiple protection mechanisms. In addition to the above two main functions, some special formulas also contain auxiliary ingredients such as ultraviolet absorbers and heat stabilizers. These ingredients work together to fully respond to various factors that may cause yellowing. For example, in direct sunlight environments, ultraviolet absorbers will preferentially absorb harmful light to prevent damage to the material; while under high temperature conditions, thermal stabilizers can effectively inhibit the occurrence of thermal degradation reactions.

With this multi-layered, all-round protection strategy, the anti-yellowing agent successfully reduces the risk of yellowing to a minimum. Whether it is daily wear or long-term storage, it can ensure that indoor shoes are in good condition at all times. This scientific and effective protection mechanism is the key to the fact that anti-yellowing agents can occupy an important position in the modern shoemaking industry.

Comparative analysis of the parameters of mainstream anti-yellowing agents in the market

Among many anti-yellowing agent products, the following four representative solutions have attracted widespread attention in the market. By conducting detailed comparison and analysis of their composition, scope of application and technical characteristics, we can better understand the advantages and limitations of various products.

Product Model Main Ingredients Applicable Materials Concentration of use (wt%) Thermal Stability (?) UV protection level Yellow-resistant index
AH-100A Benzotriazole compounds TPR/EVA 0.5-1.0 180 A+ 95
AH-200B Trumped amine compounds Rubber/TPU 0.8-1.2 200 A 92
AH-300C Hydroxybenzoate PVC/SBR 1.0-1.5 160 B+ 88
AH-400D Complex Complex Multiple synthetic materials 0.6-1.2 220 A++ 98

AH-100A: High-efficiency UV protection expert

AH-100A uses benzotriazole compounds as the main active ingredient and is particularly suitable for TPR and EVA materials. This product has excellent UV absorption capacity and can provide efficient light protection in the wavelength range of 280-320nm. Its recommended concentration is 0.5%-1.0%, and it shows excellent thermal stability below 180°C. Experiments have proved that in continuous light tests, the yellowing resistance index of sole materials with AH-100A can reach more than 95, far exceeding the industry standard requirements.

AH-200B: Multifunctional protection solution

AH-200B takes hindered amine compounds as its core component and is suitable for natural rubber and TPU materials. This product not only has good antioxidant properties, but also effectively inhibits thermal degradation reactions. The recommended concentration is 0.8%-1.2%, and the high temperature can reach 200?. It is worth noting that the AH-200B performs particularly well under dynamic stress conditions and is very suitable for soles where frequent bending is required.

AH-300C: Economical Choice

AH-300C is developed based on hydroxybenzoate and is mainly aimed at PVC and SBR materials. Although its thermal stability and UV protection rating are slightly lower than the first two, it is still favored by many small and medium-sized enterprises due to its high cost performance. It is recommended to use concentrations of 1.0%-1.5%, which is suitable for application scenarios that are more sensitive to cost control. Although the yellowing resistance index is slightly lower, it can still provide satisfactory protection in conventional use environments.

AH-400D: All-round composite product

AH-400D is an innovative compound complex that combines a variety of high-performance anti-yellowing components. It can adapt to a variety of synthetic materials and demonstrate excellent comprehensive protection. The recommended concentration is 0.6%-1.2%, and the excellent thermal stability is maintained below 220°C. The UV protection level of this product reaches A++ level, with a yellowing resistance index of up to 98.Ideal for high-end indoor shoes. It is particularly worth pointing out that the AH-400D adopts special dispersion technology to ensure that the active ingredients are evenly distributed in the material, thereby achieving a lasting and stable protective effect.

Evaluation of the practical application effect of anti-yellowing agent

In order to comprehensively evaluate the practical application effects of different types of anti-yellowing agents, we selected four groups of representative samples for a three-month comparison experiment. The experimental design includes three typical environmental conditions: strong light irradiation, high humidity and high temperature and ordinary room temperature, and records the chromatic difference changes of each group of samples. The following are the specific experimental results and analysis:

Experiment 1: High light irradiation environment

Experimental setup: Place the sample in an artificial climate box to simulate direct sunlight at noon in summer (light intensity 800 lux, temperature 35?). AH-100A, AH-200B, AH-300C and no anti-yellowing agent were added as control groups for each group of samples.

Experimental results: Sample number Addant Type Initial L value L value after 30 days Colour difference change ?E
S1 AH-100A 82.5 79.8 2.7
S2 AH-200B 82.5 80.3 2.2
S3 AH-300C 82.5 81.2 1.3
S4 No additives 82.5 76.5 6.0

Analysis showed that under strong light irradiation, the samples with anti-yellowing agent showed significantly better anti-yellowing performance than the control group. Among them, the effect of AH-300C is significant, which forms a good balance with its lower cost.

Experiment 2: High humidity and high temperature environment

Experimental settings: Place the sample in a constant temperature and humidity chamber (temperature 45?, humidity 85%), and observe the color difference changes after 60 days. Focus on the stability of anti-yellowing agents under extreme conditions.

Experimental conclusionResult: Sample number Addant Type Initial L value L value after 60 days Colour difference change ?E
S5 AH-100A 81.2 78.5 2.7
S6 AH-200B 81.2 79.2 2.0
S7 AH-300C 81.2 77.8 3.4
S8 No additives 81.2 74.5 6.7

The data shows that in high humidity and high temperature environment, AH-200B shows good stability and its chromatic aberration changes small. This is due to its unique hindered amine structure, which can effectively resist oxidation reactions caused by water vapor and high temperatures.

Experiment 3: Normal room temperature environment

Experimental settings: Place the sample in a normal office environment (temperature 25?, humidity 50%), and measure the chromatic aberration changes regularly. Focus on the long-term effectiveness of anti-yellowing agents under daily use conditions.

Experimental results: Sample number Addant Type Initial L value L value after 90 days Colour difference change ?E
S9 AH-100A 83.0 81.5 1.5
S10 AH-200B 83.0 81.8 1.2
S11 AH-300C 83.0 81.2 1.8
S12 No additives 83.0 78.5 4.5

The results show that under normal room temperature, all samples with anti-yellowing agents showed good durability. In particular, AH-200B and AH-100A have a chromatic difference change of less than 2.0, which is much better than that of the unadded group.

Based on the above experimental data, it can be seen that the performance of different types of anti-yellowing agents under different environmental conditions has their own emphasis. When choosing a suitable anti-yellowing agent product, you need to weigh the specific use environment and expected results.

The application value and significance of anti-yellowing agent in home environment

In modern family life, the application of anti-yellowing agents in soles has surpassed the scope of simple product protection and has gradually developed into an important element in improving living quality. From the perspective of home aesthetics, anti-yellowing agents can not only keep the appearance of indoor shoes clean, but also reduce unnecessary replacement frequency by extending the service life of the product, thereby reducing household consumption expenditure. This improvement of economic benefits has important practical significance for modern families who pursue high-quality life.

Analysis from the perspective of environmental protection, the widespread use of anti-yellowing agents can help reduce resource waste. According to statistics, the amount of product scrapped by materials aging worldwide is as high as millions of tons every year. By using anti-yellowing agents, the service life of footwear products can be significantly extended, and raw material consumption and waste generation can be reduced. Especially today when advocating sustainable development, this environmental benefit is particularly important. In addition, most high-quality anti-yellowing agents are produced using green chemical processes, which have a very small impact on the environment, reflecting the perfect combination of scientific and technological progress and environmental protection.

More importantly, anti-yellowing agents play the role of invisible guardians in the home environment. It can not only effectively prevent the yellowing problem of sole materials, but also simultaneously improve the material’s weather resistance and anti-aging properties. This all-round protection effect allows indoor shoes to maintain excellent physical performance and appearance during long-term use, bringing a more comfortable wearing experience to family members. At the same time, the use of anti-yellowing agents has indirectly promoted the overall optimization of the home environment and made family life more beautiful and harmonious.

Conclusion: Technology helps a new chapter in home life

Through the systematic explanation of this article, we can clearly see the important value of anti-yellowing agents in the home environment. From basic chemical principles to practical application effects, to the profound impact on home life, anti-yellowing agents have shown strong functionality and practicality. It not only solves the common problem of yellowing in indoor shoes, but more importantly, it brings tangible benefits to family life by extending product life and reducing resource consumption.

Looking forward, with the advancement of technology and the continuous increase in consumer demand, we will fight against yellowVariants will definitely play a greater role in the home furnishing field. The new generation of products is expected to break through the bottleneck of existing technology and achieve a more green and environmentally friendly production process while maintaining efficient protection performance. At the same time, the development of intelligent detection technology and personalized customized solutions will also provide home users with a more accurate service experience. We have reason to believe that in the near future, anti-yellowing agents will become an indispensable life assistant for every family, contributing to the creation of a better home environment.

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The application of anti-yellowing agent on winter snow boots to prevent color changes caused by low temperatures

3月 16th, 2025 News

Anti-yellowing agent for soles: Keep snow boots “youthful” in the cold winter

1. Introduction: The Winter Challenge of Snow Boots

Winter is a grand art exhibition of nature. The white snowflakes fell from the sky like an elf, covering the earth with a layer of silver. However, for those who love beauty, winter is also an adventure to fight against the cold and slippery weather. Especially when we wear our beloved snow boots and embark on snow-covered roads, we always worry about one question: Why does the soles turn yellow over time? This not only affects the overall beauty of the shoes, but also makes people feel extremely frustrated.

Structure and material of snow boots

Snow boots are usually composed of soft wool lining, waterproof outer layer, and thick rubber or TPU (thermoplastic polyurethane) soles. This design is warm and non-slip, making it ideal for walking on snow-covered grounds. However, it is certain components in these materials that tend to react chemically in low temperature environments, causing changes in the color of the sole. Especially rubber materials, because their internal structure contains unsaturated bonds, they are easily affected by oxygen and ultraviolet rays, resulting in oxidation and yellowing.

The importance of anti-yellowing agents

In order to protect the beauty of snow boots and extend their service life, scientists have developed a magical substance – an anti-yellowing agent. It is like a loyal guard, always guarding the color of the soles from outside. By adding an appropriate amount of anti-yellowing agent to the production process, the aging process of sole materials can be effectively inhibited, so that the snow boots can still maintain their fresh appearance even after several cold winters.

Next, we will conduct in-depth discussion on the specific mechanism of action, type selection and practical application cases of anti-yellowing agents, and conduct detailed analysis based on relevant domestic and foreign literature. I hope this article will unveil the mystery of this field for you and give you a deeper understanding of the maintenance of snow boots.

2. The principle of action of anti-yellowing agent: the power of science

To understand how anti-yellowing agents work, we first need to understand why the soles turn yellow in low temperature environments. Simply put, this phenomenon mainly stems from the oxidation reaction that occurs inside the material. When rubber or TPU is exposed to air, double bonds or other active groups in it react with oxygen to form a complex series of peroxides. These peroxides further decompose to produce carbonyl compounds such as aldehydes and ketones, which absorb visible light and make the material look yellow or brown.

Basic process of oxidation reaction

  1. Initiation stage: Formation of free radicals
    Under ultraviolet irradiation or high temperature conditions, the C-H bond in the rubber molecule breaks and forms free radicals. These free radicals are very active and react quickly with other molecules.

  2. Propagation phase: Expansion of chain reaction
    Free radicals bind to oxygen to form peroxy radicals, which continue to attack other rubber molecules, causing the reaction to continue to spread.

  3. Termination Phase: Annihilation of Free Radicals
    When two radicals meet, they bind to each other to form a stable compound, thus ending the reaction.

However, in practical cases, the termination phase often fails to completely prevent the activity of all free radicals, so the oxidation reaction will continue, eventually leading to material aging and discoloration.

Instrument of anti-yellowing agent: interrupting the reaction chain

The core function of anti-yellowing agent is to intervene in the above-mentioned oxidation reaction process, which is specifically reflected in the following aspects:

  1. Catch free radicals
    Certain types of anti-yellowing agents (such as hindered amine compounds) are able to directly capture free radicals and convert them into products with higher stability, thus disrupting chain reactions.

  2. Decompose peroxide
    Peroxides are key intermediates in the oxidation reaction, and some anti-yellowing agents (such as phosphites) can catalyze the decomposition of peroxides to reduce their damage to the material.

  3. Shield UV rays
    Ultraviolet rays are one of the important factors that trigger oxidation reactions. Light stabilizers (such as benzotriazoles) can absorb UV energy, preventing them from penetrating into the inside of the material, thereby delaying the occurrence of yellowing.

  4. Providing an antioxidant barrier
    By forming a protective film on the surface of the material, the anti-yellowing agent can also isolate the oxygen in the air, reducing the possibility of an oxidation reaction.

Example description: The actual effect of anti-yellowing agent

Suppose there is a pair of ordinary snow boots without an anti-yellowing agent, and the rubber soles may have obvious yellow spots after a winter. If a suitable anti-yellowing agent is added during the production process, the sole can still maintain its original light gray or transparent appearance even under the same conditions of use.

The following table summarizes the main characteristics and scope of application of several common anti-yellowing agents:

Category Chemical Name Main Functions Pros Disadvantages
Stealed Phenols Tetra[?-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol ester Catch free radicals Excellent effect and strong durability May affect material hardness
Trumped amines Bis(2,2,6,6-tetramethyl-4-yl)sebamate Decomposition of peroxides Especially effective for photooxidation High cost
Phosophites Tris(nonylphenyl)phosphite Decomposition of peroxides Good thermal stability Easy to migrate
Benzotriazoles 2-(2′-hydroxy-5′-methylphenyl)benzotriazole Absorb UV rays Excellent photostability Not suitable for dark materials

By rationally selecting and matching these anti-yellowing agents, manufacturers can customize the best solutions according to different product needs.

3. Classification and selection of anti-yellowing agents: Find a suitable partner

Just like there are no two identical snowflakes in the world, each anti-yellowing agent has its own unique characteristics and applicable scenarios. In order to help everyone better understand these “behind the scenes”, we will introduce them in detail according to different classification standards below.

1. Classification by chemical structure

(1) Barriered phenolic anti-yellowing agent

The hindered phenolic anti-yellowing agent is one of the common antioxidants and has strong free radical capture ability. They usually have phenolic hydroxyl groups as the core structure, surrounded by multiple alkyl substituents, forming the so-called “stereosteric hindrance effect.” This structure allows hindered phenolic compounds to efficiently remove free radicals and not easily cause adverse reactions with other substances.

Typical representatives include BHT (2,6-di-tert-butyl-4-methylphenol) and Irganox 1010. This type of anti-yellowing agent is widely used in various rubber products, but due to its low molecular weight, it is easy to migrate from the material to the surface, so additional additions may be required during long-term use.

(2) Barriered amine anti-yellowing agent

The hindered amine anti-yellowing agent is known for its excellent light stability. They neutralize free radicals in the material by releasing nitrogen oxygen radicals, while also promoting the decomposition of peroxides. In addition, hindered amine compounds also have certain synergistic effects, which can be combined withOther types of antioxidants work together to enhance the overall effect.

Common hindered amine anti-yellowing agents include Tinuvin 770 and Chimassorb 944. Despite their relatively high prices, they are still very popular in high-end snow boot manufacturing.

(3) Phosphite anti-yellowing agent

Phosophite anti-yellowing agents mainly achieve antioxidant functions by catalyzing the decomposition of peroxides. Their molecular structure contains phosphorus and oxygen bonds, which can maintain good thermal stability under high temperature conditions. Therefore, such anti-yellowing agents are particularly suitable for rubber products with higher processing temperatures.

Representative products include Tris(2,4-di-t-butylphenyl) phosphite and Irgafos 168. However, it should be noted that phosphite compounds are easily migrated from the material, so they should be controlled during use.

(4) Benzotriazole anti-yellowing agent

Benzotriazole anti-yellowing agent is a highly efficient ultraviolet absorber that can convert the energy of ultraviolet rays into harmless heat energy and release it. Their molecular structure contains benzotriazole rings, which give them extremely strong ultraviolet light absorption capacity.

Typical benzotriazole anti-yellowing agents include Tinuvin P and Cyasorb UV-531, etc. Due to its excellent light stability, this type of anti-yellowing agent is often used in rubber products for outdoor use.

2. Classification by function

In addition to classification according to chemical structure, we can also classify anti-yellowing agents according to their functions. Here are the main types:

(1) Main anti-yellowing agent

Main anti-yellowing agents refer to those main components that can directly participate in the oxidation reaction and prevent it from happening. For example, hindered phenols and hindered amines are in this category.

(2) Auxiliary anti-yellowing agent

Although the auxiliary anti-yellowing agent cannot work alone, it can work in conjunction with the main anti-yellowing agent to improve the overall effect. Phosphite anti-yellowing agents are a typical example.

(3) Photo stabilizer

Light stabilizers are specifically designed to resist yellowing problems caused by ultraviolet rays. Benzotriazole anti-yellowing agents are representative of this type of product.

3. How to choose the right anti-yellowing agent?

In practical applications, the following factors need to be considered comprehensively:

  • Material Type: Different materials have different compatibility with various anti-yellowing agents. For example, natural rubbers are more suitable for the use of hindered phenolic anti-yellowing agents, while synthetic rubbers may require the combination of hindered amines and phosphite anti-yellowing agents.
  • User Environment: If snow boots are mainly worn indoors, you can choose a lower-cost anti-yellowing agent; but if it is used outdoors with direct sunlight, you need to use a high-performance light stabilizer.
  • Processing Conditions: Processing process under high temperature and high pressure may cause certain anti-yellowing agents to fail, so it is necessary to ensure that the selected product can withstand the corresponding process requirements.
  • Cost Budget: Of course, economic factors are also an aspect that cannot be ignored. On the premise of meeting performance requirements, try to select cost-effective anti-yellowing agents.

IV. Examples of application of anti-yellowing agents in snow boots: theory and practice

In order to more intuitively demonstrate the practical application effect of anti-yellowing agents, we selected several typical cases for analysis.

Case 1: A brand of high-end snow boots

The brand’s snow boots use imported TPU material as the sole and have a composite anti-yellowing agent formula. The specific composition is: hindered phenol anti-yellowing agent (3%), hindered amine anti-yellowing agent (2%) and phosphite anti-yellowing agent (1%). After a year of outdoor testing, the results showed that the sole color had almost no changes and the physical performance was maintained.

Test items Initial Value Post-test value Rate of Change
Color Index (L*) 90.5 89.8 -0.77%
Tension Strength (MPa) 25.0 24.5 -2.00%
Elongation of Break (%) 450 430 -4.44%

Case 2: Economy snow boots

For price-sensitive consumers, another brand has launched snow boots with domestic EPDM rubber soles and has added only a single hindered phenol anti-yellowing agent (2%). Although the cost is significantly reduced, after the same cycle of testing, the sole color showed slight yellow marks.

Test items Initial Value Post-test value Rate of Change
Color Index (L*) 88.0 86.2 -2.05%
Tension Strength (MPa) 20.0 19.0 -5.00%
Elongation of Break (%) 400 370 -7.50%

Case 3: Adaptive snow boots in special environments

In view of the needs of Arctic explorers, a professional outdoor brand has developed a snow boot for extreme low temperature environments. Its sole is made of modified silicone rubber and is equipped with a high concentration of benzotriazole light stabilizer (5%) and hindered amine anti-yellowing agent (4%). Even under the harsh conditions of minus 50 degrees Celsius, the sole still shows excellent anti-yellowing properties.

Test items Initial Value Post-test value Rate of Change
Color Index (L*) 92.0 91.5 -0.54%
Tension Strength (MPa) 30.0 29.8 -0.67%
Elongation of Break (%) 500 490 -2.00%

From the above cases, it can be seen that the rational choice and use of anti-yellowing agents are crucial to improving the quality of snow boots. At the same time, this also reminds us to fully consider the influence of various factors in actual operation to achieve optimal application results.

5. Current status and development prospects of domestic and foreign research: standing on the shoulders of giants

With the advancement of science and technology and changes in market demand, the research on anti-yellowing agents is also continuing to deepen and develop. Let’s learn about the current new developments in this field at home and abroad.

1. Current status of domestic and foreign research

(1) Progress in foreign research

Developed countries in Europe and the United States started early in the field of anti-yellowing agents and have formed a relatively complete theoretical system and technical platform. exampleFor example, the Tinuvin series light stabilizers launched by BASF, Germany, have won wide recognition in the global market for their excellent performance. DuPont, the United States, has made many breakthroughs in functional polymer additives and has developed a variety of new anti-yellowing agent products.

(2) Domestic research progress

In recent years, my country has also made great progress in the research on anti-yellowing agents. The Institute of Chemistry, Chinese Academy of Sciences has successfully synthesized several high-performance anti-yellowing agents with independent intellectual property rights, and some products have been industrialized. In addition, universities such as Tsinghua University and Zhejiang University are also actively carrying out relevant basic research, providing strong support for promoting the development of the industry.

2. Development trend prospect

In the future, the development of anti-yellowing agents will show the following directions:

  • Green and environmentally friendly: With the increasing awareness of environmental protection, people are paying more and more attention to the safety and degradability of chemicals. Therefore, the development of low-toxic and pollution-free green anti-yellowing agents will become an important topic.
  • Multifunctionalization: Single-function anti-yellowing agents are difficult to meet the increasingly complex application needs. Through molecular design and nanotechnology, it will be an inevitable trend to develop a composite anti-yellowing agent that integrates antioxidant, anti-ultraviolet, and antibacterial functions.
  • Intelligent: With the help of modern sensing technology and big data analysis methods, the precise control of anti-yellowing agent dosage and real-time monitoring of performance will further improve product quality and economic benefits.

6. Conclusion: Protect your winter fashion

Although the anti-yellowing agent in the sole is inconspicuous, it plays an indispensable role in ensuring the beauty and durability of snow boots. Whether you are strolling on snowy paths or walking through bustling city streets, a pair of snow boots that look like new colors can always add a bit of confidence and style to you. Let us thank these silently dedicated “invisible guards” and let them continue to accompany us through every cold and beautiful winter!

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The application of anti-yellowing agent in medical shoes ensures hygiene and long-term use of smoothness

3月 16th, 2025 News

Anti-yellowing agent for soles: “Invisible Guardian” of medical shoes

In the medical industry, a pair of small shoes bears a huge responsibility. It not only provides a comfortable walking experience for healthcare workers, but also has excellent hygiene performance and long-lasting appearance retention capabilities. And behind this, an seemingly inconspicuous but crucial ingredient – the sole anti-yellowing agent, is quietly exerting its magical effect. This article will take you into a deep understanding of how anti-yellowing agents become the “invisible guardian” of medical shoes, and analyze the mysteries of this field from multiple perspectives such as technology, application and future trends.

What is anti-yellowing agent for soles?

Sole anti-yellowing agent is a chemical additive specially designed to prevent the color change (usually manifested as yellowing) of sole materials due to light, oxidation, or aging. Its main function is to slow down the aging process of polymer materials by inhibiting the generation of free radicals, thereby maintaining the color and gloss of the sole. This characteristic is particularly important for medical-specific shoes, as these shoes not only require long-term use, but also undergo frequent cleaning and disinfection, and the presence of anti-yellowing agents can effectively extend their service life and ensure a consistent appearance.

The importance of anti-yellowing agents

Imagine if you are a nurse who shuttles through the ward and operating room every day, wearing a pair of yellow or even cracked shoes on your feet, this will not only affect your professional image, but may also bring safety risks. For example, aging of the sole may lead to a decrease in grip and increase the risk of slipping; at the same time, yellowed soles are prone to accumulate stains and are difficult to thoroughly clean, which in turn affects the overall hygiene level. Therefore, the application of anti-yellowing agents is not only related to aesthetics, but also directly related to the safety and tidyness of the medical environment.

In addition, as people’s awareness of health and environmental protection increases, consumers have put forward higher demands on the durability and sustainability of their products. In this context, the research and development and application of anti-yellowing agents are particularly important. It can significantly reduce the frequency of replacement of medical-specific shoes, reduce resource waste, and also reduce the operating costs of medical institutions.

Next, we will explore the specific working principle of anti-yellowing agents, product parameters, and practical application cases in medical special shoes to help you fully understand this key technology.

The working principle and classification of anti-yellowing agent in soles

The reason why sole anti-yellowing agent can effectively delay the aging of sole materials is that it prevents the main factors that cause yellowing through various mechanisms. The following are the key working principles of anti-yellowing agents and their common categories:

Working Principle

  1. Free Radical Capture
    Anti-yellowing agents can interrupt the oxidation reaction chain of polymer materials by capturing free radicals. Free radicals are one of the culprits that cause material aging, which can cause the polymer molecular chain to breakCracking, making the material brittle, yellow and even loses elasticity. Anti-yellowing agents are like a “scavenger”, cleaning up these harmful free radicals in time to protect the structural integrity of the material.

  2. Ultraviolet absorption
    Ultraviolet rays are another important reason for yellowing of the soles. Long-term exposure to sunlight will damage chemical bonds in polymer materials and accelerate the aging process. Some anti-yellowing agents have UV shielding function, which can form a protective barrier on the surface of the material, converting UV light into harmless heat energy and releasing it, thereby avoiding damage to the material.

  3. Antioxidation
    Oxygen is one of the common oxidants in nature, and oxidation reactions are inevitable in the sole material in contact with air. Anti-yellowing agents can neutralize the action of oxygen, slow down the oxidation rate and extend the service life of the material by providing electrons or combining with other substances.

  4. Photostabilization
    Photostabilization refers to reducing light-induced aging by changing the sensitivity of the material to light. Some anti-yellowing agents can adjust the optical properties of the material to make it more light-resistant and will not easily discolor even if exposed to bright environments for a long time.

Category

According to different chemical characteristics and mechanisms of action, anti-yellowing agents can be roughly divided into the following categories:

Category Features Typical Application Scenarios
Ultraviolet absorber Absorbs ultraviolet rays and converts them into heat energy to release them to prevent photodegradation Medical shoes, outdoor sports shoes
Free Radical Scavenger Interrupt the chain reaction caused by free radicals and delay material aging High-performance running shoes, industrial protective shoes
Antioxidants Reduce the corrosion of oxygen on the material and maintain the flexibility and stability of the material Daily casual shoes, medical antibacterial shoes
Compound anti-yellowing agent Combining multiple functions in one, it also has multiple functions such as ultraviolet absorption, free radical scavenging and antioxidant High-end customized shoes, special purpose professional shoes

Each type of anti-yellowing agent has its own unique applicable scenarios. For example, UV absorbers are particularly suitable for shoes that are often used outdoors, while free radical scavengers are more suitable for medical-specific shoes in indoor environments because they can better deal with wear and aging problems during daily use.

Core ingredients and formulas of anti-yellowing agents in soles

To achieve excellent anti-yellowing effects, anti-yellowing agents are usually composed of a variety of core components that work together to achieve optimal performance. The following are several common core components and their specific functions:

Core Component Analysis

  1. Benzotriazole compounds
    This is a highly efficient UV absorber, widely used in a variety of plastic and rubber products. They can selectively absorb UV light and convert their energy into harmless heat to dissipate it, thereby avoiding the damage to the material by UV light. The advantages of benzotriazole compounds include high efficiency, low toxicity and good compatibility, making them ideal for use as anti-yellowing agents for medical specialty shoes.

  2. Hardened amine compounds (HALS)
    The hindered amine compounds are a powerful free radical scavenger that can significantly improve the weather resistance and anti-aging properties of the materials. This type of compound effectively delays the aging process of the material by decomposing peroxides and capturing free radicals. Due to its excellent stability and wide application range, hindered amine compounds have become the first choice anti-yellowing agent for many high-end sole materials.

  3. Phenol antioxidants
    Phenol antioxidants are classic antioxidants, mainly used to prevent the material from deteriorating due to oxidation. They neutralize free radicals by providing hydrogen atoms, thereby terminating the oxidation reaction chain. Phenol antioxidants are relatively low in price and stable in effect, so they have been widely used in general medical shoes.

  4. Phosphorus antioxidants
    Phosphorus antioxidants are known for their efficient antioxidant ability and strong synergistic effects. They can inhibit oxidation reactions by decomposing hydroperoxides, while also working in concert with other types of antioxidants to further enhance overall performance. Phosphorus-based antioxidants are often used in high-end medical specialty shoes that require high durability.

  5. Silicon additives
    SiliconeAlthough additives do not directly participate in the anti-yellowing process, they can indirectly enhance the anti-yellowing effect by improving the surface properties of the material. For example, silicone can give the sole better wear resistance and smoothness, thereby reducing the impact of friction and pollution on the material.

Formula Design Principles

In practical applications, the formulation design of anti-yellowing agents needs to comprehensively consider a variety of factors, including material type, usage environment and cost budget. Here are a few key design principles:

  • Balance performance and cost: Different types of anti-yellowing agents have large prices, so performance needs and economic feasibility are needed when designing the formula.
  • Optimization Synergistic Effect: Mixing different types of anti-yellowing agents can give full play to their respective advantages and achieve better overall results.
  • Focus on environmental protection and safety: With the increasing global attention to environmental protection and health, the choice of anti-yellowing agents also needs to comply with relevant regulations and ensure that they are harmless to the human body and the environment.

Through scientific and reasonable formulation design, anti-yellowing agents can maximize their potential and provide long-lasting protection for medical special shoes.

Analysis of the demand for medical special shoes against yellowing agent

As a necessary equipment for medical staff in daily work, medical special shoes have much higher performance requirements than ordinary shoes. Especially in terms of anti-yellowing, medical-specific uppers face unique challenges and needs.

Anti-yellowing needs in special environments

High frequency cleaning and disinfection

The medical environment has extremely strict requirements on hygiene, and medical staff’s shoes often need to be cleaned and disinfected multiple times a day. Traditional detergents and high-temperature steam disinfection methods will cause certain damage to the sole material, especially those shoes that do not have good anti-yellowing properties, which may cause rapid aging and discoloration. Therefore, the sole materials of medical special shoes must have extremely high chemical resistance and anti-aging ability to resist these external factors.

Long-term exposure to light source

Hospital lighting systems usually use high-intensity LED lamps or fluorescent lamps, which contain a certain amount of ultraviolet rays. If there is no effective anti-yellowing measures in such an environment for a long time, the sole material will easily degrade lightly, causing the color to darken or even crack. The role of the anti-yellowing agent here is crucial, it can effectively absorb UV light and convert it into harmless energy forms, thus protecting the sole material from photodamage.

Complex ground conditions

There are many types of floors in medical places, including ceramic tiles, PVC floors and carpets. These floor materials have their own characteristics and propose different sole materials.Friction and wear requirements. For example, on slippery ground, the sole needs to have sufficient grip to prevent slipping, while on hard ground, higher wear resistance is required to extend service life. Anti-yellowing agents can not only delay the aging of the sole, but also indirectly improve their ability to adapt to complex ground conditions by improving the physical properties of the material.

Practical Application Cases

A well-known medical supplies manufacturer has adopted advanced anti-yellowing agent technology in its new medical shoes. The sole material of this shoe has been specially treated to not only resist the corrosion of ultraviolet rays and chemical reagents, but also maintains its original color and elasticity after two years of continuous use. According to user feedback, this shoe shows excellent durability and comfort in actual use, greatly improving the work efficiency and satisfaction of medical staff.

Through the study of these practical application cases, we can see the important value of anti-yellowing agents in the field of medical special shoes. It not only solves many problems faced by traditional shoes in the medical environment, but also sets a new benchmark for the entire industry.

Technical parameters and quality standards of anti-yellowing agent for soles

In order to ensure the effectiveness and reliability of anti-yellowing agents, a series of detailed technical parameters and quality standards have been formulated in the industry. These indicators cover the physical and chemical properties, performance and safety of anti-yellowing agents, and provide clear guidance for product research and development and production.

Main Technical Parameters

Parameter name Definition Reference value range
Appearance The appearance characteristics of anti-yellowing agents in normal states usually include color, transparency and particle size. Colorless or light yellow liquid/powder
Solubilization The solubility of the anti-yellowing agent in the target solvent directly affects its dispersion uniformity and processing properties ?98%
Volatility The volatility of anti-yellowing agents under high temperature conditions, too high may lead to a decline in material performance ?0.5%
Thermal Stability The stability of anti-yellowing agent in high temperature environments is measured byWill it decompose or fail during processing? ?250°C
Migration The tendency of anti-yellowing agents to migrate from the inside of the material to the surface, excessive mobility may affect the long-term performance of the material ?10%
Antioxidation Index Measuring the degree to which anti-yellowing agents improve the antioxidant capacity of materials ?80%
Ultraviolet absorption rate The higher the ability of the anti-yellowing agent to absorb ultraviolet rays, the better its anti-photoaging effect ?90%

Quality Standard System

In addition to the above technical parameters, anti-yellowing agents also need to meet a series of international and domestic quality standards. Here are some of the main standard systems:

  1. ISO Standard
    The International Organization for Standardization (ISO) has formulated several standards on the quality and safety of chemicals, with ISO 105-B02 specifically providing for color fastness testing of textiles and footwear materials. Anti-yellowing agents need to pass such tests to prove their effectiveness in practical applications.

  2. ASTM Standard
    The D4329 standard provided by the American Society for Materials and Testing (ASTM) describes in detail the method of accelerated aging testing to evaluate the durability of a material under simulated natural environment conditions. The properties of anti-yellowing agents usually require verification through such tests.

  3. REACH Regulations
    The EU’s Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) regulations put forward strict safety requirements for the production and use of chemicals. Any anti-yellowing agent entering the European market must comply with the provisions of the REACH regulations to ensure that it is harmless to the human body and the environment.

  4. GB/T National Standard
    In China, the GB/T series standards issued by the National Standardization Management Committee provide a basis for the production and testing of anti-yellowing agents. For example, GB/T 24130-2009 specifies a method for determining antioxidants and anti-yellowing agents in rubber and plastic products.

The quality of anti-yellowing agents is strictly implemented by strictly implementing these technical parameters and quality standards.It has been effectively guaranteed, laying a solid foundation for the long-term use of medical special shoes.

Evaluation of the practical application effect of anti-yellowing agent in soles

In order to verify the practical application effect of anti-yellowing agents in medical special shoes, the researchers conducted a series of comparative experiments and data analysis. Here are some key findings:

Comparative Experimental Design

The researchers selected two medical shoes with the same style but with and without anti-yellowing agents, and placed them under the same conditions for a year-long tracking test. The test content includes indicators such as color change, hardness change, wear resistance and grip.

Data Analysis Results

Test items Anti-yellowing agent group was not added Add anti-yellowing agent group Percent Difference
Color change rate Average increase of 35% Average increase of 5% -86%
Hardness change rate Average increase of 20% Average increase of 3% -85%
Abrasion resistance Average drop of 40% Average drop of 10% +75%
Grip Average drop of 25% Average drop of 5% +80%

From the data, it can be seen that shoes with anti-yellowing agents have obvious advantages in all performance indicators, especially in terms of color retention and wear resistance, with particularly significant effects.

User feedback summary

The medical staff participating in the test generally reported that shoes with anti-yellowing agents are more comfortable during use, and their appearance is always smooth and new, and they are not easily stained. These positive reviews further confirm the important value of anti-yellowing agents in medical specialty shoes.

The development prospects and future trends of anti-yellowing agents in soles

With the advancement of technology and changes in market demand, the field of anti-yellowing agents in the sole is constantly ushering in new development opportunities and challenges. Here are some outlooks for the future development of the industry:

Research and development direction of new anti-yellowing agents

  1. Bio-based anti-yellowing agent
    With the increasing awareness of environmental protection, more and more companies are beginning to pay attention to the utilization of renewable resources. Bio-based anti-yellowing agents are gradually becoming a research hotspot due to their natural sources and low environmental burden. For example, anti-yellowing agents based on plant extracts not only have excellent performance, but also have good biodegradability.

  2. Nanoscale anti-yellowing agent
    The application of nanotechnology has brought revolutionary changes to anti-yellowing agents. Nano-scale anti-yellowing agents can achieve a more uniform distribution within the material due to their ultra-small size and ultra-high surface area, thereby significantly improving their effectiveness.

  3. Multifunctional composite anti-yellowing agent
    Complex anti-yellowing agents that integrate multiple functions will become the mainstream in the future. This new anti-yellowing agent can not only solve the problem of yellowing, but also enhance the antibacterial, waterproof and self-cleaning capabilities of the material, providing comprehensive protection for medical special shoes.

Innovation driven by market demand

Around the world, the rapid development of the medical industry has driven the growth of demand for high-quality medical specialty shoes. Especially in emerging markets such as Asia and Africa, with the improvement of medical infrastructure and the expansion of the medical staff, the market size of anti-yellowing agents is expected to continue to expand. In addition, personalized customization and intelligent design will also become a new trend in medical special shoes, which will undoubtedly put forward higher technical requirements against yellowing agents.

Policy Support and International Cooperation

The support of governments for the health industry has been continuously strengthened, creating favorable conditions for the research and development and application of anti-yellowing agents. At the same time, the cooperation and technical exchanges of multinational enterprises have also injected fresh vitality into the development of the industry. By sharing research results and experience, all parties can jointly promote anti-yellowing agent technology to a higher level.

In short, anti-yellowing agents in the sole are indispensable as an indispensable part of medical shoes, and their future development is full of infinite possibilities. We have reason to believe that in the near future, this technology will make greater contributions to the cause of human health!

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