News Details
PVC plastic antioxidant
2018-1-14 22:56:18
PVC plastic antioxidant
The antioxidants used in polyvinyl chloride should be compatible with polyvinyl chloride and fully integrated into PVC plastic.
The compatibility of polyvinyl chloride antioxides can be changed. Polyvinyl chloride (PVC) anti-oxygen agent can produce different compatibility with the change of the internal components of PVC.
In addition, the influencing factors of antioxidant efficiency are: 1. The structure of antioxidant. Different structures determine different mechanisms and efficiencies.
The concentration of antioxidants. An appropriate concentration of the antioxidant used in polyvinyl chloride should have an adverse effect on its effectiveness.
The volatility of antioxidants. The volatile size has a great influence on the efficiency of the antioxidant in the process of processing and use. Volatility is not conducive to performance.
Use of antioxidants. The addition and effect, synergistic effect or antagonistic effect can be produced between antioxidants. It is better to choose an anti - oxygen system with additive and effect.
Polyvinyl chloride is not a very high requirement, so most of the polyvinyl chloride formulations do not contain antioxidants. But for long - term outdoor application, high temperature environment application, the high - resistance requirements of high PVC products. In particular, oxidative cracking and potential degradation of plasticized polyvinyl chloride products, such as cable materials. In the formulation, a certain amount of antioxidant is added to ensure the inner stability and appearance quality of PVC products.
Other waste recycling in the reprocessing of polyvinyl chloride (PVC) products, not only should add, the loss of heat stabilizer, it should also add a certain amount of antioxidants, reduce the activity of free radicals because of the aging or loss. Avoid chain reaction, enhance the stability of new products and extend their service life.
Antioxidants are generally used in combination with main and auxiliary antioxidants. In terms of comprehensive performance, source and cost, bisphenol A is the most widely used polyvinyl chloride. Bisphenol A and help phosphite ester antioxidant agent and the effect is remarkable, used both have antioxidant effect on PVC, not only to prevent plasticizer volatilization and oxidation decomposition at the same time also have inhibition.
Antioxidant bisphenol A is an inefficient antioxidant, but it can meet the requirements of polyvinyl chloride, which is generally 0.3~0.5%. Help antioxidant phosphite ester (TPP) for polyvinyl chloride chelating agent use extensively, especially in metallic soap family stabilizer, cooperate to use can reduce the harm of metal chlorides, transparency and coloration protection products, generally for the amount of 0.3 ~ 1%.
Triphenyl phosphite (antioxidant, stabilizer TPPi) production process
1. Phosphorus oxychloride as the direct method (also called thermal method) phenol with pyridine and anhydrous benzene as solvent, in no more than 10 ℃ temperature, slowly add oxygen phosphorus chloride, then under reflux temperature, the reaction of 3 ~ 4 h. After cooling to room temperature, the reactants are washed by water to recycle pyridine. After centrifugal dehydration, the reagents are dehydrated with dried sodium sulfate, which is filtered to remove sodium sulfate. The first atmospheric distillation recovery of benzene, vacuum distillation, collected 243 ~ 245 ℃ (1.47 kPa) fraction, by cooling, crystallization, crushing is the finished product.
2. After phenol melting, stirring under add phosphorus trichloride under 25 ℃, Triphenyl phosphite is generated; Then heat up to 70 ℃ ventilation with chlorine gas, generated two chlorinated triphenyl phosphate; Again at 50 ℃ water hydrolysis, triphenyl phosphate. The hydrolysate with 5% soda solution for neutralization, water washing, the evaporation and vacuum distillation, collected 243 ~ 245 ℃ (1.47 kPa) fractions, cooling, crystallization, crushing, packaging is the finished product.
Triphenyl phosphite (TPPi antioxidants, stabilizer) is mainly used in PVC, polyethylene, polypropylene, polystyrene, polyester, abs resin, epoxy resin, synthetic rubber antioxidant stabilizer, used in polyvinyl chloride (PVC) products as a chelating agent.
In addition, the antioxidant agents used in polyvinyl chloride include: antioxidant CA, antioxidant 264, antioxidant 2246, antioxidant 1076, etc. The dosage is generally 0.01~0.5%. Epoxy-lipid compounds such as epoxy-soybean oil have a certain inhibitory effect on the thermal oxidation of polyvinyl chloride and synergize with antioxidant.
In the actual production of antioxidant, the method of mixing in resin or adding plasticizer is basically used. When producing soft polyvinyl chloride, the antioxidant can be added by adding plasticizer, and when producing hard polyvinyl chloride, the antioxidant can be added by conventional dry mixing method.
Antioxidants can delay or inhibit the oxidation degradation of polyvinyl chloride, enhance the stability of polyvinyl chloride, improve the color and weatherability of the products, and prolong the life of the products.
Antioxidants are not commonly used in polyvinyl chloride (PVC), but the outdoor products, cable material, waste PVC recycle it or other formula, add a certain amount of antioxidant, can improve its performance, improve the appearance quality.
Antioxidants can effectively prevent the oxidation of plasticizers in PVC products.
In order to improve the performance of PVC, it is necessary to study the application of antioxidant in polyvinyl chloride.
Polyvinyl chloride is a polymer material that USES a chlorine atom instead of a hydrogen atom in polyethylene. It is an amorphous polymer containing a small amount of crystalline structure. The structure of this material is as follows: [- CH2 - CHCl -]n. PVC is a linear polymer with the head - tail structure in most of the VCM monomers. Carbon atoms are serrated, and all atoms are connected by a bond. All carbon atoms are sp3 hybridized.
There is a short interlocking structure in PVC molecular chain. With the decrease of polymerization temperature, the regulation of the interstitial structure increased. In the structure of polyvinyl chloride, there are some disadvantages such as head structure, branched chain, double bond, allyl chloride and tertiary chlorine, etc. After cross linking, this kind of defect can be eliminated.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
The antioxidants used in polyvinyl chloride should be compatible with polyvinyl chloride and fully integrated into PVC plastic.
The compatibility of polyvinyl chloride antioxides can be changed. Polyvinyl chloride (PVC) anti-oxygen agent can produce different compatibility with the change of the internal components of PVC.
In addition, the influencing factors of antioxidant efficiency are: 1. The structure of antioxidant. Different structures determine different mechanisms and efficiencies.
The concentration of antioxidants. An appropriate concentration of the antioxidant used in polyvinyl chloride should have an adverse effect on its effectiveness.
The volatility of antioxidants. The volatile size has a great influence on the efficiency of the antioxidant in the process of processing and use. Volatility is not conducive to performance.
Use of antioxidants. The addition and effect, synergistic effect or antagonistic effect can be produced between antioxidants. It is better to choose an anti - oxygen system with additive and effect.
Polyvinyl chloride is not a very high requirement, so most of the polyvinyl chloride formulations do not contain antioxidants. But for long - term outdoor application, high temperature environment application, the high - resistance requirements of high PVC products. In particular, oxidative cracking and potential degradation of plasticized polyvinyl chloride products, such as cable materials. In the formulation, a certain amount of antioxidant is added to ensure the inner stability and appearance quality of PVC products.
Other waste recycling in the reprocessing of polyvinyl chloride (PVC) products, not only should add, the loss of heat stabilizer, it should also add a certain amount of antioxidants, reduce the activity of free radicals because of the aging or loss. Avoid chain reaction, enhance the stability of new products and extend their service life.
Antioxidants are generally used in combination with main and auxiliary antioxidants. In terms of comprehensive performance, source and cost, bisphenol A is the most widely used polyvinyl chloride. Bisphenol A and help phosphite ester antioxidant agent and the effect is remarkable, used both have antioxidant effect on PVC, not only to prevent plasticizer volatilization and oxidation decomposition at the same time also have inhibition.
Antioxidant bisphenol A is an inefficient antioxidant, but it can meet the requirements of polyvinyl chloride, which is generally 0.3~0.5%. Help antioxidant phosphite ester (TPP) for polyvinyl chloride chelating agent use extensively, especially in metallic soap family stabilizer, cooperate to use can reduce the harm of metal chlorides, transparency and coloration protection products, generally for the amount of 0.3 ~ 1%.
Triphenyl phosphite (antioxidant, stabilizer TPPi) production process
1. Phosphorus oxychloride as the direct method (also called thermal method) phenol with pyridine and anhydrous benzene as solvent, in no more than 10 ℃ temperature, slowly add oxygen phosphorus chloride, then under reflux temperature, the reaction of 3 ~ 4 h. After cooling to room temperature, the reactants are washed by water to recycle pyridine. After centrifugal dehydration, the reagents are dehydrated with dried sodium sulfate, which is filtered to remove sodium sulfate. The first atmospheric distillation recovery of benzene, vacuum distillation, collected 243 ~ 245 ℃ (1.47 kPa) fraction, by cooling, crystallization, crushing is the finished product.
2. After phenol melting, stirring under add phosphorus trichloride under 25 ℃, Triphenyl phosphite is generated; Then heat up to 70 ℃ ventilation with chlorine gas, generated two chlorinated triphenyl phosphate; Again at 50 ℃ water hydrolysis, triphenyl phosphate. The hydrolysate with 5% soda solution for neutralization, water washing, the evaporation and vacuum distillation, collected 243 ~ 245 ℃ (1.47 kPa) fractions, cooling, crystallization, crushing, packaging is the finished product.
Triphenyl phosphite (TPPi antioxidants, stabilizer) is mainly used in PVC, polyethylene, polypropylene, polystyrene, polyester, abs resin, epoxy resin, synthetic rubber antioxidant stabilizer, used in polyvinyl chloride (PVC) products as a chelating agent.
In addition, the antioxidant agents used in polyvinyl chloride include: antioxidant CA, antioxidant 264, antioxidant 2246, antioxidant 1076, etc. The dosage is generally 0.01~0.5%. Epoxy-lipid compounds such as epoxy-soybean oil have a certain inhibitory effect on the thermal oxidation of polyvinyl chloride and synergize with antioxidant.
In the actual production of antioxidant, the method of mixing in resin or adding plasticizer is basically used. When producing soft polyvinyl chloride, the antioxidant can be added by adding plasticizer, and when producing hard polyvinyl chloride, the antioxidant can be added by conventional dry mixing method.
Antioxidants can delay or inhibit the oxidation degradation of polyvinyl chloride, enhance the stability of polyvinyl chloride, improve the color and weatherability of the products, and prolong the life of the products.
Antioxidants are not commonly used in polyvinyl chloride (PVC), but the outdoor products, cable material, waste PVC recycle it or other formula, add a certain amount of antioxidant, can improve its performance, improve the appearance quality.
Antioxidants can effectively prevent the oxidation of plasticizers in PVC products.
In order to improve the performance of PVC, it is necessary to study the application of antioxidant in polyvinyl chloride.
Polyvinyl chloride is a polymer material that USES a chlorine atom instead of a hydrogen atom in polyethylene. It is an amorphous polymer containing a small amount of crystalline structure. The structure of this material is as follows: [- CH2 - CHCl -]n. PVC is a linear polymer with the head - tail structure in most of the VCM monomers. Carbon atoms are serrated, and all atoms are connected by a bond. All carbon atoms are sp3 hybridized.
There is a short interlocking structure in PVC molecular chain. With the decrease of polymerization temperature, the regulation of the interstitial structure increased. In the structure of polyvinyl chloride, there are some disadvantages such as head structure, branched chain, double bond, allyl chloride and tertiary chlorine, etc. After cross linking, this kind of defect can be eliminated.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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