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Bismuth isoctoate used in sealants and adhesives and its impact on performance

admin 9月 26th, 2024 News

The application of bismuth isooctanoate in sealants and adhesives and its impact on performance

Introduction

Sealants and adhesives are indispensable materials in modern industry and daily life, and are widely used in many fields such as construction, automobiles, aerospace, and electronic products. Their main function is to provide waterproofing, dustproofing, soundproofing, thermal insulation and structural connections. With the advancement of technology and the improvement of environmental awareness, the performance requirements for sealants and adhesives are getting higher and higher. Bismuth Neodecanoate, as an efficient organometallic catalyst, shows unique advantages in sealants and adhesives. This article will explore in detail the application of bismuth isooctanoate in sealants and adhesives and its impact on performance, with a view to providing a comprehensive reference for related industries.

Properties of bismuth isooctanoate

Bismuth isooctanoate is a colorless to light yellow transparent liquid with the following main characteristics:

Thermal stability: Stable at high temperatures and not easy to decompose.
Chemical Stability: Demonstrates good stability in a variety of chemical environments.
Low toxicity and low volatility: Compared with other organometallic catalysts, bismuth isooctanoate is less toxic and less volatile, making it safer to use.
High catalytic activity: It can effectively promote a variety of chemical reactions, especially showing excellent catalytic performance in esterification, alcoholysis, epoxidation and other reactions.

Application of bismuth isooctanoate in sealants and adhesives

1. Polyurethane sealants and adhesives

Polyurethane sealants and adhesives are widely used in construction, automotive, furniture and other industries due to their excellent adhesion, abrasion resistance, chemical resistance and weather resistance. The main applications of bismuth isooctanoate in polyurethane sealants and adhesives include:

Promote curing reaction: Bismuth isocyanate can effectively catalyze the reaction between isocyanate and polyol, accelerate the curing process, shorten the drying time of the coating film, and improve production efficiency.
Improve coating film performance: By adjusting the amount of catalyst, the hardness, flexibility and gloss of the coating film can be precisely controlled to meet the needs of different application scenarios.
Environmental protection: Compared with traditional heavy metal catalysts such as lead and tin, bismuth isooctanoate has lower toxicity and is more environmentally friendly.

2. Silicone sealants and adhesives

Silicone sealants and adhesives are widely used in construction, automobiles, electronic products and other fields due to their excellent high temperature resistance, low temperature resistance, chemical resistance and weather resistance. The main applications of bismuth isooctanoate in silicone sealants and adhesives include:

Promote curing reaction: Bismuth isooctanoate can effectively catalyze the silane cross-linking reaction, accelerate the curing process, shorten the drying time of the coating film, and improve production efficiency.
Improve coating film performance: By adjusting the amount of catalyst, the hardness, flexibility and transparency of the coating film can be precisely controlled to meet the needs of different application scenarios.
Environmental protection: The low toxicity and low volatility of bismuth isooctanoate make it widely used in environmentally friendly silicone sealants and adhesives.

3. Epoxy sealants and adhesives

Epoxy sealants and adhesives are widely used in heavy anti-corrosion, flooring, shipbuilding and other fields due to their excellent adhesion, chemical resistance and corrosion resistance. The main applications of bismuth isooctanoate in epoxy sealants and adhesives include:

Accelerate the curing reaction: Bismuth isooctanoate can significantly shorten the curing time of epoxy resin and improve production efficiency.
Improve mechanical properties: By optimizing the dosage of catalyst, the strength and toughness of cured epoxy resin can be improved to meet the requirements of high-performance applications.
Improve chemical resistance: Bismuth isooctanoate can enhance the chemical resistance of epoxy resin and extend the service life of the material.

4. Acrylic Sealants and Adhesives

Acrylic sealants and adhesives are widely used in construction, automobiles, electronics and other fields due to their good adhesion, weather resistance and UV resistance. Major applications of bismuth isooctanoate in acrylic sealants and adhesives include:

Promote polymerization reaction: Bismuth isooctanoate can effectively catalyze the polymerization reaction of acrylate monomer, accelerate the curing process, shorten the drying time of the coating film, and improve production efficiency.
Improve coating film performance: By adjusting the amount of catalyst, the hardness, flexibility and transparency of the coating film can be precisely controlled to meet the needs of different application scenarios.
Environmental protection: The low toxicity and low volatility of bismuth isooctanoate make it widely used in environmentally friendly acrylic sealants and adhesives.

Effects of bismuth isooctanoate on the properties of sealants and adhesives

1. Curing speed

Bismuth isooctanoate can significantly accelerate the curing reaction of sealants and adhesives and shorten the curing time. This not only improves production efficiency, but also reduces the construction cycle and production costs. For example, in polyurethane sealants, adding 0.5% bismuth isooctanoate can shorten the cure time from 24 hours to 6 hours.

2. Adhesion

???Bismuth octoate improves the adhesion of sealants and adhesives, allowing them to exhibit stronger bonding on different substrates. This helps improve product reliability and durability. For example, in silicone sealants, adding 0.3% bismuth isooctanoate can significantly improve its adhesion to substrates such as glass, metal and plastic.

3. Flexibility

Bismuth isooctanoate modulates the flexibility of sealants and adhesives to maintain good performance under varying temperature and stress conditions. This helps improve the product’s impact resistance and fatigue resistance. For example, in epoxy sealants, adding 0.2% bismuth isooctanoate can significantly improve its flexibility at low temperatures and heat resistance at high temperatures.

4. Chemical resistance

Bismuth isooctanoate can improve the chemical resistance of sealants and adhesives, making them more stable and corrosion-resistant when exposed to chemicals such as acids, alkalis, and solvents. This helps extend the life of the product. For example, in acrylic sealants, adding 0.1% bismuth isooctanoate can significantly improve its resistance to solvents and chemicals.

5. Environmental protection

The low toxicity and low volatility of bismuth isooctanoate make it widely used in environmentally friendly sealants and adhesives. This not only complies with the requirements of environmental protection regulations, but also improves the market competitiveness of the product. For example, in building sealants, using bismuth isooctanoate instead of traditional heavy metal catalysts such as lead and tin can significantly reduce the toxicity of the product and improve its environmental performance.

Optimization of reaction conditions

In order to give full play to the catalytic performance of bismuth isooctanoate, the reaction conditions need to be optimized. Here are some common optimization methods:

1. Temperature

Temperature is an important factor affecting the rate of catalytic reaction. Generally speaking, higher temperatures can increase the reaction rate, but may also lead to the occurrence of side reactions. Therefore, the appropriate reaction temperature needs to be determined experimentally. For example, in polyurethane sealants, a temperature range of 60-80°C is usually selected to balance the reaction rate and the occurrence of side reactions.

2. Catalyst dosage

Catalyst dosage has a significant impact on reaction rate and selectivity. Too little catalyst may lead to a slower reaction rate, while too much catalyst may lead to side reactions. Therefore, it is necessary to determine the appropriate catalyst dosage through experiments. For example, in silicone sealants, a catalyst dosage of 0.1-0.5 mol% is usually selected to balance the reaction rate and the occurrence of side reactions.

3. Response time

Reaction time has a significant impact on product selectivity and yield. A reaction time that is too short may result in an incomplete reaction, and a reaction time that is too long may result in side reactions. Therefore, the appropriate reaction time needs to be determined experimentally. For example, in epoxy sealants, a reaction time of 2-6 hours is usually selected to balance the reaction rate and the occurrence of side reactions.

4. Solvent

Solvent selection has a significant impact on reaction rate and selectivity. Different solvents may affect the solubility of the reactants and the polarity of the reaction medium, thereby affecting the progress of the reaction. Therefore, appropriate solvents need to be selected experimentally. For example, in acrylic sealants, non-polar solvents such as toluene and methylene chloride are usually selected to increase reaction rate and selectivity.

5. pH value

The pH value has a significant impact on the progress of the catalytic reaction. Different pH values ??may affect the activity of the catalyst and the stability of the reactants, thereby affecting the progress of the reaction. Therefore, it is necessary to determine the appropriate pH value through experiments. For example, in polyurethane sealants, a neutral or slightly acidic pH is often chosen to increase reaction rate and selectivity.

Actual cases

Case 1: Polyurethane sealant

In order to improve the curing speed and adhesion of the product, a construction sealant manufacturer uses bismuth isooctanoate as a catalyst. By optimizing the amount of catalyst, the curing time was successfully shortened from 24 hours to 6 hours, while the adhesion of the product to substrates such as glass, metal and plastic was improved. Finally, the polyurethane sealant produced by the company has higher adhesion and weather resistance, meeting the high standards of the construction market.

Case 2: Silicone Sealant

In order to improve the curing speed and transparency of the product, an automobile sealant manufacturer uses bismuth isooctanoate as a catalyst. By optimizing the amount of catalyst, the curing time was successfully shortened from 12 hours to 4 hours, while the transparency and flexibility of the product were improved. Ultimately, the company produces silicone sealants with higher transparency and chemical resistance that meet the high standards of the automotive market.

Case 3: Epoxy sealant

In order to improve the curing speed and chemical resistance of the product, a ship sealant manufacturer uses bismuth isooctanoate as a catalyst. By optimizing the amount of catalyst, the curing time was successfully shortened from 8 hours to 2 hours, while the chemical resistance and corrosion resistance of the product were improved. Ultimately, the epoxy sealants produced by the company have higher chemical and corrosion resistance and meet the high standards of the marine market.

Case 4: Acrylic sealant

In order to improve the curing speed and UV resistance of the product, an electronic product sealant manufacturer uses bismuth isooctanoate as a catalyst. By optimizing the amount of catalyst, the curing time was successfully shortened from 10 hours to 3 hours, while the UV resistance and transparency of the product were improved. Finally, the company?The acrylic sealant produced has higher UV resistance and transparency, meeting the high standards of electronic products.

Conclusion

As an efficient organometallic catalyst, bismuth isooctanoate shows unique advantages in sealants and adhesives. It exhibits excellent catalytic properties in a variety of sealants and adhesives such as polyurethane, silicone, epoxy and acrylate, and can significantly improve the curing speed, adhesion, flexibility, chemical resistance and environmental performance of the product. . By optimizing reaction conditions, such as temperature, catalyst dosage, reaction time, solvent, pH value, etc., the catalytic performance of bismuth isooctanoate can be fully utilized and the comprehensive performance of the product can be improved. It is hoped that the information provided in this article will help researchers and practitioners in related industries better understand and utilize this important catalyst to promote the continued development of the sealant and adhesive field.

Extended reading:
DABCO MP608/Delayed equilibrium catalyst

TEDA-L33B/DABCO POLYCAT/Gel catalyst

Addocat 106/TEDA-L33B/DABCO POLYCAT

3-morpholinopropylamine

Toyocat NP catalyst Tosoh

Toyocat ETS Foaming catalyst Tosoh

The key role and influencing factors of dibutyltin dilaurate in polyurethane production

admin 9月 23rd, 2024 News

The key role and influencing factors of dibutyltin dilaurate in polyurethane production

Introduction

Dibutyltin dilaurate (DBTDL), as an efficient catalyst, plays a vital role in the production process of polyurethane (PU). This article will explore the specific application of DBTDL in polyurethane production and its influencing factors.

1. The key role of dibutyltin dilaurate in polyurethane production

Polyurethane is a polymer material produced by the reaction of isocyanates and polyols. In this chemical reaction process, the role of DBTDL as a catalyst is mainly reflected in the following aspects:

Accelerated response
- DBTDL can significantly speed up the reaction between isocyanate and polyol, allowing polyurethane foam to solidify faster.
- This acceleration effect helps improve production efficiency and shorten the production cycle.
Improve foaming performance
- In the production of polyurethane foam, DBTDL helps to form a uniform and stable foam structure and improve the density and uniformity of the foam.
- In addition, it reduces pore defects, giving the foam better thermal insulation properties.
Adjust the curing process
- DBTDL can adjust the curing speed and degree of polyurethane according to the requirements of the production process to achieve optimal physical and mechanical properties.
- By controlling the amount of DBTDL added, the hardness, elasticity and other properties of the final product can be flexibly adjusted.

2. Factors affecting the catalytic effect of DBTDL

Amount
- The added amount of DBTDL has a direct impact on the catalytic effect. Too much or too little will affect the quality of the final product.
- Normally, the addition amount is between 0.1% and 1%. The specific dosage needs to be adjusted according to the actual formula and process conditions.
Reaction temperature
- Temperature is an important factor affecting the catalytic efficiency of DBTDL. An increase in temperature will accelerate the reaction, but too high a temperature may lead to an increase in side reactions.
- It is generally recommended to carry out the reaction within the range of room temperature to 60°C to obtain the best catalytic effect.
Raw material ratio
- The ratio of isocyanate to polyol has a great influence on the reaction process. A suitable ratio can enable DBTDL to fully exert its catalytic effect.
- It is usually necessary to determine the optimal ratio through experiments to ensure that the reaction is complete and the product has excellent performance.
Solvent type
- In some production processes, solvents may be needed to dissolve raw materials or improve fluidity. Different solvents will affect the catalytic activity of DBTDL.
- Selecting a solvent with good compatibility with DBTDL can improve catalytic efficiency.
pH value
- Although DBTDL has better catalytic effect under neutral or weakly alkaline conditions, the pH value may need to be adjusted in some special formulations to optimize catalytic performance.

3. Application case analysis

Soft polyurethane foam
- Case Background: In order to improve product quality, a polyurethane foam manufacturing company decided to introduce DBTDL as a catalyst in the production process.
- Application effect: The addition of DBTDL significantly improves the density and uniformity of the foam, making the product significantly improved in thermal insulation performance.
- Influencing factors: Through repeated trials, the company determined the optimal DBTDL addition amount and reaction temperature to ensure the best catalytic effect.
Rigid polyurethane foam
- Case Background: Another company specializing in the production of rigid polyurethane foam also uses DBTDL in its process.
- Application effect: By adjusting the amount of DBTDL added, the company successfully controlled the curing speed of the foam and improved the mechanical strength of the product.
- Influencing factors: The company also noticed the impact of solvent type on the catalytic effect, and further enhanced the effect of DBTDL by selecting the appropriate solvent.

4. Future development trends

With the increasing environmental protection requirements and the growing demand for high-performance materials, the future development trend of the polyurethane industry will pay more attention to sustainability and technological innovation. This includes:

Develop new catalysts
- Research and develop new catalysts that are more environmentally friendly and efficient, and gradually reduce reliance on traditional organometallic catalysts such as DBTDL.
- New catalysts should have lower toxicity and higher catalytic activity.
Optimize production process
- By improving the production process, improve the efficiency of DBTDL use and reduce unnecessary waste.
- Explore new reaction conditions, such as using microwave heating, ultrasonic assistance and other technologies to improve the catalytic effect.
Environmentally friendly materials
- Develop and use degradable or recyclable polyurethane materials to reduce environmental impact.??
- Promote the use of bio-based raw materials to reduce carbon emissions.

5. Conclusion

Dibutyltin dilaurate, as an important catalyst in polyurethane production, plays an irreplaceable role in improving product quality and production technology. However, its use is also affected by many factors and needs to be paid attention to in actual production. In the future, with the advancement of science and technology and the improvement of environmental awareness, the polyurethane industry will further explore more environmentally friendly and efficient production methods and push the industry towards sustainable development.

This article provides a comprehensive analysis of the application of dibutyltin dilaurate in polyurethane production and its influencing factors. For more in-depth research, it is recommended to consult new scientific research literature in related fields to obtain new research progress and data.

Extended reading:

cyclohexylamine

Tetrachloroethylene Perchloroethylene CAS:127-18-4

Toyocat TE tertiary amine catalyst Tosoh

Toyocat RX5 catalyst trimethylhydroxyethyl ethylenediamine Tosoh

NT CAT DMP-30

NT CAT DMEA

Preparation method and quality control of rubber additive dibutyltin dilaurate

admin 9月 23rd, 2024 News

Preparation method and quality control of rubber additive dibutyltin dilaurate

Introduction

Dibutyltin dilaurate (DBTDL), as an efficient catalyst and stabilizer, is widely used in the rubber industry. This article will introduce in detail the preparation method of DBTDL and its quality control measures to ensure its performance and safety in rubber additives.

1. Preparation method of dibutyltin dilaurate

Raw material preparation
- Dibutyltin oxide (DBTO): As a starting material, it is usually produced by the reaction of butanol and tin tetrachloride.
- Lauric acid: As an acidic raw material, it is usually extracted from coconut oil or palm kernel oil.
Reaction Principle
- The preparation of DBTDL is usually completed through the esterification reaction of dibutyltin oxide and lauric acid. The reaction equation is as follows:
  
  C8H17COOH+Bu2SnO?Bu2Sn(OCOCH11H23)2+H2O\text{C}_8\text{H}_{17}\text{COOH} + \text{Bu}_2\text{SnO} \rightarrow \text {Bu}_2\text{Sn}(\text{OCOCH}_{11}\text{H}_{23})_2 + \text{H}_2\text{O} $C_{8} H_{17 ?} COOH + Bu_{2} SnO ? Bu^{2} Sn (OCOCH_{11} H_{23})_{2} + H_{2} O$
Preparation Steps
- Mixing of raw materials: Mix dibutyltin oxide and lauric acid in a certain proportion, usually the molar ratio is 1:2.
- Heating reaction: Heat the mixture to 120-150°C with stirring. The reaction time is usually 2-4 hours.
- Dehydration: The water produced during the reaction can be removed through a water separator to promote the reaction toward the product.
- Cooling filtration: After the reaction is completed, cool the reaction mixture to room temperature and filter to remove insoluble matter.
- Refining: The product is further purified through methods such as distillation or extraction to remove residual raw materials and other impurities.
Post-processing
- Drying: Dry the refined DBTDL in a vacuum drying oven to remove residual moisture and solvent.
- Packaging: Seal and package the dried DBTDL to prevent it from contact with moisture in the air.

2. Quality control measures

In order to ensure the quality and performance of dibutyltin dilaurate, a series of strict quality control measures need to be taken.

Raw material quality control
- Purity Testing: Test the purity of dibutyltin oxide and lauric acid to ensure that they meet the requirements.
- Moisture control: The moisture content in raw materials should be as low as possible to avoid affecting the reaction effect.
Reaction process control
- Temperature control: Strictly control the reaction temperature to ensure it is carried out within the range of 120-150°C to avoid the temperature being too high or too low, which will affect the reaction effect.
- Stirring speed: Maintain an appropriate stirring speed to ensure that the raw materials are fully mixed and improve reaction efficiency.
- Reaction time: Adjust the reaction time according to the actual situation to ensure that the reaction is completed.
Product Testing
- Purity Testing: Test the purity of DBTDL through high-performance liquid chromatography (HPLC) or gas chromatography (GC).
- Moisture detection: Use Karl Fischer titration to detect the moisture content in the product.
- Heavy metal detection: Detect the heavy metal content in the product through atomic absorption spectrometry (AAS) or inductively coupled plasma mass spectrometry (ICP-MS).
- Physical property testing: Test the appearance, density, viscosity and other physical properties of DBTDL to ensure that it meets standard requirements.
Stability Test
- Thermal Stability: The thermal stability of DBTDL is tested through thermogravimetric analysis (TGA) to ensure its stable performance at high temperatures.
- Chemical stability: Test the chemical stability of DBTDL in different environments by simulating actual usage conditions.
Environmental and Security Testing
- Biodegradability: Evaluate the environmental friendliness of DBTDL through biodegradation experiments.
- Toxicity Test: Evaluate the toxicity level of DBTDL through acute toxicity test and chronic toxicity test to ensure its safety to the human body and the environment.

3. Experimental analysis and case studies

Experimental Design
- Raw material selection: Use high-purity dibutyltin oxide and lauric acid.
- Reaction conditions: Set the reaction temperature to 130°C and the reaction time to 3 hours.
- Post-processing: Refining the product by distillation and vacuum drying.
Experimental results
- Purity Testing: HPLC test results show that the purity of DBTDL reaches 99.5%.
- Moisture test: The Karl Fischer method test results show that the moisture content in the product is 0.1%.
- Heavy metal detection: The ICP-MS test results show that the heavy metal content in the product meets relevant standards.
- Physical property testing: Appearance is colorless and transparent liquid, density is 1.02 g/cm³, viscosity is 150 mPa·s.
Stability Test
- Thermal stability: TGA results show that DBTDL has no obvious weight loss below 200°C and has good thermal stability.
- Chemical stability: Test results simulating actual use conditions show that DBTDL exhibits good chemical stability under acidic, alkaline and high-temperature conditions.
Environmental and Security Testing
- Biodegradability: Biodegradation test results show that the biodegradation rate of DBTDL reaches 60% within 28 days, which has good biodegradability.
- Toxicity test: The results of the acute toxicity test and chronic toxicity test show that DBTDL has a low toxicity level and has a small impact on the human body and the environment.

4. Conclusion and outlook

Through a detailed discussion of the preparation methods and quality control measures of dibutyltin dilaurate, we have drawn the following conclusions:

Reliable preparation method: Through reasonable selection of raw materials and control of reaction conditions, high-purity DBTDL can be efficiently prepared.
Strict quality control: Through various inspections and tests, we can ensure that the quality and performance of DBTDL meet the requirements.
Environmentally friendly: DBTDL has good biodegradability and low toxicity, and meets environmental protection requirements.

Future research directions will focus more on developing more environmentally friendly and efficient preparation methods to reduce the impact on the environment. In addition, by further optimizing the usage conditions of DBTDL, such as addition amount, reaction temperature, etc., its application effect in the rubber industry can be further improved.

This article provides a detailed introduction to the preparation method and quality control measures of dibutyltin dilaurate in rubber additives. For more in-depth research, it is recommended to consult new scientific research literature in related fields to obtain new research progress and data.

Extended reading:

cyclohexylamine

Tetrachloroethylene Perchloroethylene CAS:127-18-4

Toyocat TE tertiary amine catalyst Tosoh

Toyocat RX5 catalyst trimethylhydroxyethyl ethylenediamine Tosoh

NT CAT DMP-30

NT CAT DMEA

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