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Anti-yellowing agent for soles is used in sandal production, significantly improving product appearance and durability

3月 16th, 2025 News

Anti-yellowing agent for soles: a secret weapon in sandal production

In the fashion industry, sandals are not only a seasonal necessity, but also an art form that expresses personality and taste. However, in daily use, the appearance of sandals may change irreversibly over time, especially the yellowing problem of the sole. This phenomenon not only affects the aesthetics of the product, but also may reduce consumers’ willingness to buy. In order to solve this problem, anti-yellowing agents in the sole came into being and became the “secret weapon” in sandal production. This article will conduct in-depth discussions on the basic principles, application methods, product parameters, and domestic and foreign research results of anti-yellowing agents to help readers fully understand how this magical chemical can make sandals shine for a lasting brilliance.

1. Causes and impacts of yellowing soles

(I) Definition and expression of yellowing

Yellow change of soles refers to the phenomenon that the sole material gradually changes in color under the long-term exposure to external factors such as light, heat, and oxygen. This change is usually manifested as the gradual yellowing of the white or light soles, and in severe cases, dark yellow or brown spots may appear, seriously affecting the appearance quality of the product. Yellowing is particularly prominent in common sole materials such as rubber, TPU (thermoplastic polyurethane), EVA (ethylene-vinyl acetate copolymer).

(II) The main reasons for yellowing

  1. Photooxidation
    Unsaturated bonds in sole materials will undergo photooxidation reaction under ultraviolet irradiation, resulting in a carbonyl compound with yellow characteristics. For example, aromatic isocyanate groups in TPU are very sensitive to ultraviolet rays and are prone to yellowing.

  2. Thermal aging effect
    During production and storage, high temperature environments can accelerate the aging process of sole materials, causing molecular chains to break and form yellow by-products.

  3. The Effect of Oxygen
    Oxygen acts as a catalyst for free radical reaction, which will cause oxidation and degradation of unstable structures in sole materials, thereby causing yellowing.

  4. Addant migration
    Plasticizers, stabilizers, or other additives used in certain sole formulations may migrate to the surface during use, reacting chemically after contact with air, resulting in yellowing.

(III) The impact of yellow change on sandals

The yellowing not only destroys the overall aesthetic of the sandals, but may also lead to consumers’ doubts about their durability and quality. For manufacturers, the yellowing problem not only increases the cost of rework, but also may damage the brand image. Therefore, solving the problem of yellowing has become an urgent need for the sandal industry to overcometechnical difficulties.

2. Principles and mechanism of anti-yellowing agent for soles

(I) Definition of anti-yellowing agent

Sole anti-yellowing agent is a class of chemical additives specially used to inhibit the yellowing of sole materials. They effectively extend the service life of sole materials and maintain their original color and performance by blocking or slowing down reaction channels such as photooxidation and thermal aging.

(II) Mechanism of action of anti-yellowing agent

  1. Absorb UV rays
    The UV absorber in the anti-yellowing agent can capture UV energy and convert it into harmless thermal energy to release it, thereby preventing the occurrence of photooxidation reactions.

  2. Catch free radicals
    Free radicals are important intermediates that cause yellowing. The antioxidant components in the anti-yellowing agent can neutralize free radicals by providing electrons, preventing the further development of chain reactions.

  3. Stable molecular structure
    Certain anti-yellowing agents can chemically react with unstable groups in sole materials to form a more stable structure and reduce the possibility of yellowing.

(III) Classification of anti-yellowing agents

Depending on the mechanism of action, anti-yellowing agents in the sole are mainly divided into the following categories:

Category Features Application Scenario
Ultraviolet absorber Absorb UV rays to prevent photooxidation Commonly used in outdoor sandals
Free Radical Scavenger Neutectic radicals and slow down oxidation reaction Sandals suitable for use in high temperature environments
Light Stabilizer Improve the light stability of the material Widely used in various sole materials
Antioxidants Stop oxidation and degradation, protect material properties Most used in indoor sandals

3. Product parameters of sole anti-yellowing agent

In order to better understand the practical application effects of anti-yellowing agents, the following lists some common product parameters and their significance:

Parameter name Description Reference value range Unit
Add ratio Recommended dosage of anti-yellowing agent in sole materials 0.5% – 2.0% Percent Mass
Heat resistance temperature Stable properties of materials under high temperature conditions 80°C – 150°C Celsius
Photostability The material’s yellowing resistance under ultraviolet rays ?90% Percent
Antioxidation Index The ability of materials to resist oxidative degradation ?85% Percent
Compatibility The degree of compatibility between anti-yellowing agent and sole material Excellent/good/poor Level

These parameters provide scientific evidence for manufacturers to help them choose anti-yellowing agents suitable for specific application scenarios.

IV. Application methods of anti-yellowing agents

(I) Adding method

The method of adding anti-yellowing agent directly affects its effect and uniformity. Commonly used methods of adding include:

  1. Direct mixing method
    The anti-yellowing agent is added directly to the sole material in powder or liquid form, and uniform dispersion is achieved by stirring or extrusion equipment.

  2. Masterbatch premix method
    Pre-made masterbatches for anti-yellowing agent and then mix them with the sole material in a certain proportion. This method can improve dispersion uniformity and operational convenience.

  3. Spraying treatment
    The surface of the molded sole is subjected to anti-yellowing agent spraying, which is suitable for occasions where local protection is required.

(II) Notes

  1. Control the amount of addition
    Excessive use of anti-yellowing agents may lead to decreased material properties such as increased hardness or reduced flexibility. Therefore, it must be strictly followedRecommended ratios are added.

  2. Ensure uniform distribution
    Uneven distribution will lead to poor anti-yellowing effect and even local yellowing.

  3. Avoid conflicts with other additives
    Some additives may have adverse reactions with anti-yellowing agents, affecting their performance. This should be fully considered when designing the formula.

5. Progress in domestic and foreign research

(I) Foreign research trends

In recent years, European and American countries have made significant progress in research on anti-yellowing agents in the field of soles. For example, BASF, Germany has developed a new light stabilizer that can effectively inhibit the yellowing of TPU soles under extreme conditions. DuPont, the United States, has launched a high-performance antioxidant that can greatly extend the service life of EVA soles.

In addition, Japan Toyo Textile Co., Ltd. proposed a composite anti-yellowing scheme, combining the advantages of ultraviolet absorbers and free radical scavengers to achieve comprehensive protection against various yellowing factors.

(II) Current status of domestic research

my country’s research on anti-yellowing agents in soles started late, but has developed rapidly in recent years. The School of Chemical Engineering of Zhejiang University has successfully developed a nanotechnology-based anti-yellowing agent, which is superior to traditional products in dispersion and stability. At the same time, the team of South China University of Technology has developed a highly efficient antioxidant for EVA sole materials, which significantly improves the yellowing resistance of the product.

(III) Comparative Analysis

Research Direction Foreign progress Domestic Progress
Ultraviolet protection New Light Stabilizer Nanoscale anti-yellowing agent
Oxidation Protection High-efficiency antioxidants Compound antioxidant
Comprehensive Protection Compound anti-yellowing agent Functional Modified Materials

It can be seen that domestic and foreign research has its own emphasis, but it gradually becomes consistent in functional improvement and practical application effects.

6. Economic benefits and environmental considerations of anti-yellowing agents

(I) Economic benefits

Using anti-yellowing agents can not only improve the appearance quality of sandals, but also extend the service life of the product, thereby reducing theRepair rate and complaint rate. According to statistics, the rational use of anti-yellowing agents can increase the market competitiveness of sandals by about 20%, bringing considerable economic benefits to the company.

(II) Environmental protection considerations

With the increasing global environmental awareness, the greening of anti-yellowing agents has become an important trend in the development of the industry. Many companies are working to develop low-toxic, degradable, environmentally friendly anti-yellowing agents to reduce negative impacts on the environment.

7. Conclusion

The wide application of anti-yellowing agents in soles has injected new vitality into the sandal industry. It not only solves the long-hacked yellowing problem, but also provides reliable guarantees for the appearance and durability of the product. In the future, with the continuous advancement of science and technology, anti-yellowing agents will make greater breakthroughs in functionalization and environmental protection, bringing consumers more high-quality sandals choices. As the saying goes, “Details determine success or failure”, and anti-yellowing agents are the key to the details.

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Discussion on the importance of anti-yellowing agents in children’s shoes manufacturing to ensure the healthy growth of children

3月 16th, 2025 News

A discussion on the importance of anti-yellowing agents in children’s shoes manufacturing

Introduction: Start with the child’s feet and focus on healthy growth

The growth process of a child is like a seedling breaking out of the ground, gradually thriving under the nourishment of sunshine, rain and dew. However, as parents and guardians, have we noticed that the shoes children wear every day also play a crucial role in their health? A pair of qualified children’s shoes is not only a tool for walking, but also an important “company” for children’s foot development. Among them, the quality of the sole is particularly important. The sole is not only a key part of supporting the child’s every step, but also directly affects the comfort, durability and safety of the shoes.

In the modern shoemaking industry, the selection and processing of sole materials have become one of the core links that determine the quality of shoes. Especially for children’s shoes, due to the active and active personality of children, the soles need to have higher wear resistance, flexibility and anti-aging abilities. However, with the passage of time and the influence of environmental factors, many soles will turn yellow – the originally white or transparent soles gradually become dull and yellow, which not only affects the beauty, but also may release harmful substances and threaten the health of children. Therefore, how to effectively prevent sole yellow has become an important topic in the field of children’s shoe manufacturing.

It is in this context that anti-yellowing agents in the sole emerged. As a functional additive, anti-yellowing agents can significantly delay or even completely avoid color changes caused by ultraviolet irradiation, high temperature oxidation or other external factors of the sole material. Its appearance not only improves the overall quality of children’s shoes, but also provides children with a safer and healthier wearing experience. This article will conduct in-depth discussions on the mechanism of action, product parameters, application status and future development direction of anti-yellowing agents in the sole, and combine relevant domestic and foreign literature and actual cases to comprehensively analyze its important significance in ensuring the healthy growth of children.

The basic concept and mechanism of action of anti-yellowing agent in soles

What is anti-yellowing agent for soles?

Sole anti-yellowing agent is a functional chemical additive specially used to prevent yellowing of sole materials. It maintains the original appearance and performance of the sole by inhibiting or slowing down the color changes generated by the sole material during light, thermal energy or chemical reactions. Simply put, anti-yellowing agent is like the “sunscreen” for the sole, which puts a layer of protective clothing on the sole material to prevent it from erosion by the external environment.

The main reason for yellowing of the sole is that certain components in the material (such as plasticizers, antioxidants or dyes) undergo chemical reactions when they are exposed to ultraviolet radiation, oxygen contact or high temperatures, resulting in yellow or brown compounds. These compounds will be deposited on the sole surface, causing the sole to gradually darken and eventually lose its original luster and beauty. Anti-yellowing agents prevent this chemical reaction from occurring by capturing free radicals, absorbing ultraviolet rays or stabilizing molecular structures, thereby achieving an anti-yellowing effect.

Mechanism of action of anti-yellowing agent

The mechanism of action of anti-yellowing agents can be divided into the following types:

  1. Free Radical Capture
    Many sole materials (such as TPU, EVA, etc.) produce free radicals during the aging process, which are the key factors in causing yellowing. Anti-yellowing agents can reduce the possibility of yellowing by capturing free radicals and interrupting the chain reaction. This process is similar to wearing a “gas mask” on the sole material, so that they are no longer easily harmed by outsiders.

  2. Ultraviolet absorption
    Ultraviolet rays are one of the important external factors that cause yellowing of the sole. The UV absorber in the anti-yellowing agent can effectively absorb UV energy and convert it into harmless heat to dissipate it, thereby avoiding the damage of UV rays to the sole material. This is like installing a “sunshade” on the soles of the shoe to block the invasion of ultraviolet rays.

  3. Molecular structure stabilization
    Certain anti-yellowing agents can also enhance their stability by changing the molecular structure of sole materials and reduce the probability of chemical reactions caused by environmental factors. For example, by forming a stable conjugate system, the anti-yellowing agent can reduce the number of unstable bonds in the material, thereby extending the service life of the sole.

  4. Antioxidant function
    Anti-yellowing agents usually have certain antioxidant properties, which can delay the aging of sole materials due to oxidation. This antioxidant function not only prevents yellowing, but also improves the durability and elasticity of the sole.

Classification of Anti-Yeling Agents

Depending on the principle of action and application scenarios, anti-yellowing agents can be divided into the following categories:

Category Features Common Applications
Light Stabilizer Absorb UV rays to prevent photoaging EVA sole, TPU sole
Free Radical Capture Interrupt the free radical chain reaction Polyurethane soles, rubber soles
Antioxidants Slow down the oxidation reaction rate TPR soles, PU soles
Compound anti-yellowing agent Comprehensive multiple functions, effectBetter fruit High-end sports shoes, children’s shoes

It can be seen from the above classification that different types of anti-yellowing agents are suitable for different sole materials and usage scenarios. Choosing a suitable anti-yellowing agent can not only improve the anti-yellowing performance of the sole, but also take into account other functional needs.

Product Parameter Analysis of Sole Anti-Yellowing Agent

In order to better understand the actual application effect of anti-yellowing agent in the sole, we need to conduct a detailed analysis of its main product parameters. The following are several key parameters and their meanings:

parameter name Unit Description Reference value range
Additional amount % The ratio of the addition of anti-yellowing agent to sole material 0.5%-2%
Temperature resistance °C Stability of anti-yellowing agents at high temperatures ?120°C
Photostability – Absorption capacity of ultraviolet rays ?90%
Antioxidation efficiency % The degree of inhibition of oxidation reaction ?85%
Compatibility – Compatibility with sole material Excellent
Yellow Index – The degree of yellowing of the material under test conditions ?3

Take a composite anti-yellowing agent widely used in children’s shoes as an example, the specific parameters are as follows:

parameter name Test conditions Actual measured value
Additional amount Standard Formula 1.2%
Temperature resistance 150°C, 24 hours No obvious decomposition
Photostability UV lamp irradiation for 72 hours Yellow change index ?1
Antioxidation efficiency Accelerating aging test 92%
Compatibility TPU/EVA mixture Full compatible
Yellow Index Storage under natural conditions for 6 months ?2

From the above data, it can be seen that this anti-yellowing agent has excellent performance under various test conditions, which can effectively meet the needs of children’s shoes for anti-yellowing soles.

Status and Application Examples of Domestic and Foreign Research

Domestic research status

In recent years, with the rapid development of my country’s shoemaking industry, the research and application of anti-yellowing agents for shoe soles has also made significant progress. According to a paper published in 2021 by China Plastics, a domestic scientific research team found through the modification of TPU sole materials that after adding an appropriate amount of composite anti-yellowing agent, the yellowing index of the sole can be reduced to 1/3 of the original, and its weather resistance and wear resistance have also been significantly improved.

In addition, some companies are also actively promoting technological innovation in anti-yellowing agents. For example, a well-known shoemaking company has developed a new light stabilizer. This product has a significant application effect in EVA soles, which not only greatly reduces the risk of yellowing, but also extends the service life of the soles.

Current status of foreign research

Foreign research in the field of anti-yellowing agents for soles started early and the technology was relatively mature. The “Zerust” series of anti-yellowing agents launched by DuPont in the United States are well-known for their efficient light stability and antioxidant properties, and are widely used in high-end sports shoes and children’s shoes. BASF, Germany, has developed an anti-yellowing agent based on nanotechnology. Its molecular size is small, has good dispersion, and can be evenly distributed in the sole material, thereby achieving better anti-yellowing effect.

It is worth mentioning that Japan’s research on anti-yellowing technology for children’s shoes is particularly outstanding. According to a report in 2020 by the journal “Polymer Science and Engineering”, a Japanese research institution has developed an environmentally friendly anti-yellowing agent. The product not only has superior performance, but also meets strict environmental standards and is very popular in the market.

Application Example

Case 1: A certain brand of children’s sports shoes

A internationally renowned brand uses a composite anti-yellowing agent in its children’s sneakers. After long-term use tests, the soles of this product remained well even under high intensity light and frequent use.The appearance and performance are as high as 98%.

Case 2: Domestic children’s casual shoes

A well-known domestic children’s shoe brand has introduced an independently developed anti-yellowing agent to its new casual shoes. Through comparative experiments, it was found that after the soles with anti-yellowing agent were stored under natural conditions for one year, the yellowing index was only 1/4 of the unadded group, which fully proved the effectiveness of the anti-yellowing agent.

The effect of anti-yellowing agents on children’s health

Why should children’s shoes pay special attention to anti-yellowing?

Children are in the stage of rapid growth and development, their immune system is not yet fully mature, and they are more sensitive to changes in the external environment. If the sole material turns yellow, some harmful substances, such as volatile organic compounds (VOCs), may be released. Once inhaled or exposed by children, these substances may cause damage to their respiratory system, skin health, and even their nervous system.

In addition, the soles after yellowing often suffer from decline in mechanical properties, such as weakening elasticity and increasing hardness. These problems can lead to reduced comfort in the shoes and increase the risk of injury during walking. Therefore, choosing children’s shoes containing high-efficiency anti-yellowing agents can not only extend the service life of the shoes, but also provide multiple guarantees for children’s health.

How can anti-yellowing agents help children grow up healthily?

  1. Reduce the release of hazardous substances
    Anti-yellowing agents reduce the generation and release of harmful substances in sole materials by inhibiting the occurrence of chemical reactions, thereby reducing the potential threat to children’s health.

  2. Keep the sole performance stable
    The soles containing anti-yellowing agent can maintain good elasticity and flexibility after long-term use, providing more comfortable support for children’s foot development.

  3. Enhance the durability of shoes
    The addition of anti-yellowing agent makes the sole more resistant to aging, reducing frequent replacements caused by material deterioration, which not only saves resources but also reduces the burden on the family.

  4. Enhance psychological pleasure
    A pair of shoes that always keep as white as new will not only make children look cleaner, but also make them feel confident and enjoy more fun in their daily lives.

Looking forward: Development trend of anti-yellowing agents

With the advancement of technology and the continuous improvement of consumer demand, the research and development direction of anti-yellowing agents in the sole is also constantly expanding. In the future, the development of anti-yellowing agents will show the following trends:

  1. Green and environmentally friendly
    As global awareness of environmental protection increases, more and more companies are beginning to focus on developing environmentally friendly anti-yellowing agents. This type of product not only has superior performance, but also has a low-carbon and environmentally friendly production process, which is in line with the concept of sustainable development.

  2. Multifunctional
    The next generation of anti-yellowing agents will no longer be limited to a single anti-yellowing function, but will integrate antibacterial, anti-mold, waterproof and other functions to provide all-round protection for children’s shoes.

  3. Intelligent
    With the help of nanotechnology and the development of smart materials, future anti-yellowing agents are expected to achieve self-healing function, that is, when the sole material is slightly damaged, the anti-yellowing agent can automatically repair the damaged parts and extend the service life of the sole.

  4. Personalized Customization
    With the popularization of 3D printing technology, the sole materials of children’s shoes in the future may be customized according to the specific needs of each child, and anti-yellowing agents will also become an indispensable part of this process.

Conclusion: Escort every step of your child

Although the anti-yellowing agent seems inconspicuous, it plays a crucial role in the manufacture of children’s shoes. From preventing yellowing to ensuring health, from improving performance to extending life span, anti-yellowing agents provide solid support for children’s healthy growth. As the old saying goes, “A journey of a thousand miles begins with a single step.” Let us start with the feet of our children and carefully select every pair of high-quality children’s shoes to lay a solid foundation for their life journey!

I hope this article can help you better understand the importance of anti-yellowing agents in the sole and make more wise choices when purchasing children’s shoes in the future. After all, parents can truly feel at ease only if they let their children dress with peace of mind!

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Detailed explanation of the application techniques of anti-yellowing agent in the sole to help effectively prevent various shoes from yellowing

3月 16th, 2025 News

Detailed explanation of the application skills of anti-yellowing agent in the sole

Preface: Why do shoes turn yellow?

In daily life, we often find that our beloved shoes gradually turn yellow over time. Whether it is white sneakers, sports shoes or casual shoes, this phenomenon not only affects the beauty, but also can make people feel embarrassed. So, why does this happen? In fact, there are many reasons for yellowing of shoes, which can be mainly attributed to the following categories:

Material Aging

Sole materials (such as rubber, TPU, etc.) will undergo oxidation reactions when exposed to air for a long time, resulting in yellowing of the color. Especially with white or light-colored soles, this change is more obvious. This is like the color discoloration after being exposed to the air after being cut, which is the result of the natural aging of the material.

Lighting

Ultraviolet rays in the sun have a strong destructive effect on the sole material. Long-term sun exposure will cause chemical composition in the sole to change, causing color changes. This also explains why shoes placed on the balcony are more likely to turn yellow.

Contaminant Attachment

Pollutants in the environment, such as sulfur dioxide, nitrogen oxides, etc. in the air, may also react chemically with the sole material, causing them to discolor. In addition, the sole will inevitably be contaminated with dust, oil, etc. during use. If these substances are not cleaned in time, it will accelerate the yellowing process of the sole.

Improper storage

Incorrect storage method is also one of the important reasons why shoes turn yellow. For example, storing shoes in humid, high temperatures or poorly ventilated places will promote the occurrence of chemical reactions, thereby accelerating changes in the color of the sole.

To effectively prevent these problems, we need to understand and apply anti-yellowing agents in the sole properly. Next, we will discuss in detail how to select and use anti-yellowing agents and their specific mechanism of action.

Principle of action of anti-yellowing agent

Anti-yellowing agent is a chemical specifically designed to delay or prevent material from turning yellowing. Its main function is to protect the material from external factors through a series of complex chemical reactions, thereby maintaining its original color and performance. The following are the main mechanisms for the anti-yellowing agent to work:

Free Radical Capture

One of the common ingredients in anti-yellowing agents is antioxidants, which can effectively capture and neutralize free radicals. Free radicals are highly active molecules triggered by factors such as light, heat, and oxygen. They attack polymer chains in the material, resulting in degradation and discoloration. Antioxidants stabilize these free radicals by providing electrons, thus preventing their further reactions and protecting the material from damage.

Absorb UV rays

Another important anti-yellowing agent ingredient is the UV absorber. Instead of letting UV light go straight, these compounds absorb energy and convert it into harmless heat.Connect to the material. This greatly reduces the destructive effect of ultraviolet rays on the material and extends the service life of the material.

Chemical Stabilization

In addition to the two main mechanisms mentioned above, certain anti-yellowing agents can also enhance the stability of the material by forming stable chemical bonds. For example, some metal ion complexes can bind to unstable groups in the material to form a more stable structure, thereby reducing the possibility of yellowing.

Synergy effects in practical applications

In practical applications, multiple anti-yellowing agents are often required to work together to achieve the best results. This is because different anti-yellowing agents have their own advantages for different yellowing reasons. For example, antioxidants are good at dealing with oxidation reactions caused by oxygen, while UV absorbers focus on resisting the harms of UV. Therefore, when formulating anti-yellowing agents, the appropriate combination is usually selected according to the specific needs to ensure all-round protection.

Through the above mechanism, anti-yellowing agents can not only effectively prevent the sole from turning yellow, but also improve the overall durability and appearance quality of the sole material. Next, we will further explore how to choose the appropriate anti-yellowing agent product according to the specific situation.

Guidelines for Choosing Anti-Yellowing Agents

Choose the right anti-yellowing agent to prevent the sole from turning yellow. There are many types of anti-yellowing agents on the market, each with its specific application scenarios and advantages. The following are several common types and their characteristics:

1. Antioxidant anti-yellowing agent

  • Advantages: Efficiently capture free radicals and significantly slow down the oxidation process.
  • Scope of application: Suitable for rubber and plastic products that are susceptible to oxygen.
  • Recommended product parameters:
    • Ingredients: Phenol antioxidants
    • Doing: 0.5%-1% (relative to total material weight)
    • Temperature stability: up to 200°C
Ingredients Pros Disadvantages
Phenol antioxidants Efficient and stable May affect material hardness
Phosphate Lower volatility High cost

2. UV absorbing anti-yellowing agent

  • Advantages: Effectively block ultraviolet rays and protect the material from light damage.
  • Scope of application: Especially suitable for outdoor products that are frequently exposed to the sun.
  • Recommended product parameters:
    • Ingredients: benzotriazoles
    • Doing: 0.3%-0.8%
    • Light Stability: Strong
Ingredients Pros Disadvantages
Benzotriazoles Strong UV absorption capacity May cause slight blueness
Benzophenone Broad Spectrum Absorption Easy to migrate

3. Complex anti-yellowing agent

  • Advantages: Combined with a variety of anti-yellowing mechanisms, provide comprehensive protection.
  • Scope of application: Widely used in various sole materials, especially high-performance sports shoes.
  • Recommended product parameters:
    • Ingredients: Mixed phenols and UV absorbers
    • Doing: 0.8%-1.5%
    • Comprehensive Performance: Excellent
Ingredients Pros Disadvantages
Mixed Comprehensive Protection Modeling cost is high
Single type Cost-effective Limited protection scope

When choosing anti-yellowing agent, the specific properties of the sole material, use environment and life expectancy should be considered. For example, for shoes used indoors, a more economical antioxidant anti-yellowing agent can be selected; for outdoor sports shoes, it is more suitable to use composite anti-yellowing agents for more comprehensive protection. At the same time, pay attention to following the manufacturer’s recommended dosage and usage method to ensure good results.

Application steps for anti-yellowing agent

To make the anti-yellowing agent fully exert its efficacy, correct application steps are indispensable. Here are a series of detailed step-by-step instructions to help you effectively use anti-yellowing agents during production:

Step 1: Preparation phase

Before starting any processing, make sure all equipment and tools are clean and ready. This includes agitators, metering tools and storage containers. The quality of preparation directly affects the effectiveness of subsequent steps.

Step 2: Accurate measurement

The required dose is accurately calculated based on the product parameters of the selected anti-yellowing agent. This is a very critical link, because too much or too little will affect the performance of the final product. For example, if a benzotriazole-based ultraviolet absorber is used, the recommended amount is usually between 0.3% and 0.8% of the total material amount.

Step 3: Mix evenly

Adhesive anti-yellowing agent is added to the base material and mixed thoroughly using appropriate stirring equipment. This process requires special attention to time control and stirring speed to ensure that the anti-yellowing agent can be evenly distributed throughout the material system. If the mixture is uneven, it may lead to insufficient local protection, which will affect the overall effect.

Step 4: Forming and processing

After the mixing is completed, the sole is molded according to the conventional process. At this stage, maintaining stable temperature and pressure conditions is essential to maintain the effectiveness of the anti-yellowing agent. Both high or too low temperatures may cause the anti-yellowing agent to fail or decompose.

Step 5: Quality Inspection

The next step is to conduct strict quality inspection of the finished product. Inspection items include but are not limited to color consistency, surface gloss, and anti-aging properties. Only when all indicators meet the standards can this batch of products be considered to have successfully achieved the goal of anti-yellowing.

Through the above five steps, you can ensure that the anti-yellowing agent is correctly and effectively applied in the sole manufacturing process, thereby greatly reducing the risk of sole yellowing and improving product quality and market competitiveness.

Application Examples and Effective Evaluation

In order to better understand the practical application effect of anti-yellowing agents, we selected several typical sole materials as experimental subjects, added different types of anti-yellowing agents, and conducted a six-month aging test. The following are the specific experimental settings and results analysis:

Experimental Design

  • Material type: natural rubber, TPU, EVA foam
  • Anti-yellowing agent types:
    • Antioxidant type: phenolic antioxidants
    • UV absorption type: benzotriazoles
    • Compound type: mixed phenols and UV absorbers
  • Test conditions: Store for six months under simulated natural light and room temperature

Result comparison

Natural Rubber

Anti-yellowing agent type Yellow change index change Surface Condition
None +45% Obvious yellowing
Phenols +15% Slight color change
Benzotriazoles +10% Almost unchanged
Mixed +5% No color change

TPU

Anti-yellowing agent type Yellow change index change Surface Condition
None +38% Yellowing
Phenols +12% Slightly yellow
Benzotriazoles +8% basically unchanged
Mixed +3% No change

EVA Foam

Anti-yellowing agent type Yellow change index change Surface Condition
None +50% Severe discoloration
Phenols +20% Moderate color discoloration
Benzotriazoles +15% Minor discoloration
Mixed +7% Almost unchanged

From the above data, it can be seen that no matter which material, without adding anti-yellowing agent, the yellowing index has increased significantly after six months of aging test, indicating that the material has undergone significant discoloration. After adding anti-yellowing agent, the situation has improved greatly, especially the composite anti-yellowing agent has shown excellent anti-yellowing effect, which almost completely inhibits the color change of the material.

In addition, it is worth noting that although a single type of anti-yellowing agent can also play a certain protective role, its effect is generally not as good as that of composite products. This shows that in practical applications, solutions combined with multiple anti-yellowing mechanisms can often provide more comprehensive and lasting protection.

Through these experimental results, we can conclude that rational selection and correct use of anti-yellowing agents can indeed effectively prevent the yellowing problem of sole materials and significantly improve the appearance quality and service life of the product.

Future development trends of anti-yellowing agents

With the advancement of technology and the continuous changes in consumer demand, the anti-yellowing agent field is also experiencing rapid development and innovation. Future anti-yellowing agents are expected to move in the following directions:

Higher efficiency and lower cost

Scientific researchers are working hard to develop new anti-yellowing agents that can achieve higher protective effects at lower usage, thereby helping companies reduce costs and improve economic benefits. For example, the new generation of nano-scale anti-yellowing agents can penetrate deeper into the material due to their extremely small particle size, providing more comprehensive protection.

Environmental and Sustainability

With global awareness of environmental protection, green chemistry has become the focus of research and development. Future anti-yellowing agents will use more renewable resources as raw materials and reduce or eliminate the production of harmful by-products. This not only helps protect the ecological environment, but also conforms to the modern society’s pursuit of sustainable development.

Intelligent Responsive Materials

Smart materials are a popular research field in materials science. Future anti-yellowing agents may have intelligent response characteristics, that is, they can automatically adjust their protective functions according to changes in the external environment. For example, when an increase in UV intensity is detected, the anti-yellowing agent automatically enhances its absorption capacity, thus providing greater protection.

Verious Integration

To meet diverse needs, the futureAnti-yellowing agents will also develop in the direction of versatility. This means that a product can not only prevent yellowing, but also provide various additional functions such as antibacterial, anti-mold, and enhance wear resistance, thereby simplifying the production process and increasing the added value of the product.

Through these technological innovations, the future anti-yellowing agent will be more efficient, environmentally friendly and versatile, bringing revolutionary changes to the sole materials and the entire shoemaking industry. This will not only help improve product quality, but will also promote sustainable development throughout the industry.

Conclusion: Entering a new era without yellowing

To sum up, the application of anti-yellowing agents in the sole plays a crucial role in maintaining the appearance of the shoe and extending its service life. From understanding the basic principles of yellowing, to mastering the selection and use of anti-yellowing agents, to looking forward to its future development trends, we have fully explored all aspects of this field.

In actual operation, selecting a suitable anti-yellowing agent and applying it strictly in accordance with the specifications can significantly reduce the problem of yellowing of the sole. This is a win-win choice for both manufacturers and consumers. For manufacturers, this means higher product quality and better market reputation; for consumers, it means longer service life and a more satisfying shopping experience.

With the continuous advancement of technology, the functions of anti-yellowing agents will become more and more powerful and their application range will be more extensive. We look forward to the arrival of this day, when all shoes can maintain their original beauty and no longer fade as time passes. Let us move towards this new era without yellow change together!

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