News Details
Plastic material antioxidants
2018-1-6 12:17:39
Plastic material antioxidants
The anti-oxidant can effectively reduce the autooxidation reaction speed of plastic materials and the plastic additives that delay the degradation of plastic materials, and its application involves almost all polymer products. The antioxygenation of plastic materials usually includes phenolic antioxygenation agent, phosphorus and sulfur auxiliary antioxidant and metal ion passivation.
Plastic polymers commonly is polar polymer, and plastic material of antioxidant molecules with different degrees of polarity, the intermiscibility is poorer, usually under the high temperature plastic materials combined antioxidants and polymer melt during the curing reaction of polymer between the antioxidant capacity in polymer molecules.
Within the scope of the dosage of formula, antioxidants to melt under the processing temperature, it is important to pay special attention to, the design formula, choose the melting point of solid antioxidant or melting range limit, should not be lower than the plastic polymer processing temperature.
Billingham and Calvert have shown that polymer crystal area spherulite interface of amorphous phase, is the most susceptible to oxidation in the polymer matrix, solubility good antioxidant was focused on the area of polymer needs it most.
Plastic products, especially the surface area and volume (or weight ratio) value relatively small, opaque products oxidation reaction mainly occurs on the surface of products, which requires antioxidant continuously from plastic products surface of internal migration to products and play a role. To move too fast on the surface of the products, but if the large amount of migration, antioxidants will evaporate into the environment, on the surface of the products or spread to contact with the surface of other medium loss, this loss is inevitable, in fact, the design formula should be considered.
When antioxidants varieties have a choice, should choose relatively large molecular weight, high melting point appropriate varieties, and in the most severe processing conditions and using the environment as the prerequisite to determine the amount of adding antioxidants.
The market of plastic anti-oxygen agent grew by about 5% annually in 2005-2008, and about 2% in 2008 and 2011. In 2011, the total consumption of plastic anti-oxidants in the world was about 420,000 tons, and the demand and production of antioxidant agents continued to shift from Europe and America to emerging Asian markets, especially China and India. The consumption of antioxidant agents was still dominated by blocked phenols.
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.
The addition of antioxidant to plastic materials is only one of the methods to improve the heat resistance and oxygen tolerance of plastics. The anti - thermal - oxygen aging function is the basic function of anti - aging.
The hindered ammonia has good thermal and oxygen stability and function, especially the polymerized polymer blocked ammonia. The resistance of ammonia to polyvinyl chloride is good.
When designing a stable system of antioxidants, it is important to consider the factors that weaken or inhibit the action of antioxidants.
Determined by way of test or practical application of antioxidant system and antioxidant only under certain conditions can have certain effect, very slight variations in certain conditions, the effect of antioxidant and function may be significantly affected. One of the main reasons for the anti-aging design requirement of anti-aging plastic products is that there are local mechanical defects in the products.
The quantity and quality of domestic antioxidants can meet the needs of the petrochemical industry and the plastics industry.
Special antioxidant mother material. Use grain instead of powder material is one of the development of plastic additives to, its advantage is to solve dust powder additives in use process, process complex, mixed problem such as uneven, with metal effect, the lower the melting point.
Antioxidant market demand is so intertwined with synthetic resin production and consumption, as the world's manufacturing plant in China, with the integration of refining and the rapid development of the coal to olefin plant, domestic synthetic resin production will maintain rapid growth trend, while production increased, but currently imports more than 16 million tons every year. According to the statistics and customs data of China petrochemical association, the consumption of five major synthetic resin in China was nearly 54 million tons in 2011.
According to the statistics, during the 11th five-year plan period, the total annual growth rate of the top five synthetic resins in China is about 11.1%, and the annual growth rate of plastic products is about 17.0%. Although the growth rate has slowed in the past two years, the growth rate of domestic synthetic resins will remain at around 5-7% during the 12th five-year plan period. With the development of resin and products, the increase and refinement of resin plate number, specialization and functionalization will stimulate and stimulate the market demand of antioxidants. In the next few years, the annual growth rate of domestic plastic anti-oxidants is expected to remain between 6 and 8 percent.
With the rapid development of plastic industry, especially all kinds of continuous development and application of new functional plastics, global antioxidant industry is the composite polymer quantitative,, environmental protection, hydrolysis resistance, high temperature resistance, such as multi-functional direction.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
The anti-oxidant can effectively reduce the autooxidation reaction speed of plastic materials and the plastic additives that delay the degradation of plastic materials, and its application involves almost all polymer products. The antioxygenation of plastic materials usually includes phenolic antioxygenation agent, phosphorus and sulfur auxiliary antioxidant and metal ion passivation.
Plastic polymers commonly is polar polymer, and plastic material of antioxidant molecules with different degrees of polarity, the intermiscibility is poorer, usually under the high temperature plastic materials combined antioxidants and polymer melt during the curing reaction of polymer between the antioxidant capacity in polymer molecules.
Within the scope of the dosage of formula, antioxidants to melt under the processing temperature, it is important to pay special attention to, the design formula, choose the melting point of solid antioxidant or melting range limit, should not be lower than the plastic polymer processing temperature.
Billingham and Calvert have shown that polymer crystal area spherulite interface of amorphous phase, is the most susceptible to oxidation in the polymer matrix, solubility good antioxidant was focused on the area of polymer needs it most.
Plastic products, especially the surface area and volume (or weight ratio) value relatively small, opaque products oxidation reaction mainly occurs on the surface of products, which requires antioxidant continuously from plastic products surface of internal migration to products and play a role. To move too fast on the surface of the products, but if the large amount of migration, antioxidants will evaporate into the environment, on the surface of the products or spread to contact with the surface of other medium loss, this loss is inevitable, in fact, the design formula should be considered.
When antioxidants varieties have a choice, should choose relatively large molecular weight, high melting point appropriate varieties, and in the most severe processing conditions and using the environment as the prerequisite to determine the amount of adding antioxidants.
The market of plastic anti-oxygen agent grew by about 5% annually in 2005-2008, and about 2% in 2008 and 2011. In 2011, the total consumption of plastic anti-oxidants in the world was about 420,000 tons, and the demand and production of antioxidant agents continued to shift from Europe and America to emerging Asian markets, especially China and India. The consumption of antioxidant agents was still dominated by blocked phenols.
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.
The addition of antioxidant to plastic materials is only one of the methods to improve the heat resistance and oxygen tolerance of plastics. The anti - thermal - oxygen aging function is the basic function of anti - aging.
The hindered ammonia has good thermal and oxygen stability and function, especially the polymerized polymer blocked ammonia. The resistance of ammonia to polyvinyl chloride is good.
When designing a stable system of antioxidants, it is important to consider the factors that weaken or inhibit the action of antioxidants.
Determined by way of test or practical application of antioxidant system and antioxidant only under certain conditions can have certain effect, very slight variations in certain conditions, the effect of antioxidant and function may be significantly affected. One of the main reasons for the anti-aging design requirement of anti-aging plastic products is that there are local mechanical defects in the products.
The quantity and quality of domestic antioxidants can meet the needs of the petrochemical industry and the plastics industry.
Special antioxidant mother material. Use grain instead of powder material is one of the development of plastic additives to, its advantage is to solve dust powder additives in use process, process complex, mixed problem such as uneven, with metal effect, the lower the melting point.
Antioxidant market demand is so intertwined with synthetic resin production and consumption, as the world's manufacturing plant in China, with the integration of refining and the rapid development of the coal to olefin plant, domestic synthetic resin production will maintain rapid growth trend, while production increased, but currently imports more than 16 million tons every year. According to the statistics and customs data of China petrochemical association, the consumption of five major synthetic resin in China was nearly 54 million tons in 2011.
According to the statistics, during the 11th five-year plan period, the total annual growth rate of the top five synthetic resins in China is about 11.1%, and the annual growth rate of plastic products is about 17.0%. Although the growth rate has slowed in the past two years, the growth rate of domestic synthetic resins will remain at around 5-7% during the 12th five-year plan period. With the development of resin and products, the increase and refinement of resin plate number, specialization and functionalization will stimulate and stimulate the market demand of antioxidants. In the next few years, the annual growth rate of domestic plastic anti-oxidants is expected to remain between 6 and 8 percent.
With the rapid development of plastic industry, especially all kinds of continuous development and application of new functional plastics, global antioxidant industry is the composite polymer quantitative,, environmental protection, hydrolysis resistance, high temperature resistance, such as multi-functional direction.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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