News Details
High polymer antioxidants
2018-1-16 12:16:24
High polymer antioxidants
Polymer in the processing, storage and use process under the role of oxygen in the air, especially in the heat, light, or the presence of heavy metal ions, will accelerate degradation or crosslinking polymer molecular chain, leading to product impact strength, crooked strength, tensile strength, stretching rate and other physical and mechanical properties declined dramatically, which affect the normal use of polymer products. This phenomenon is known as the automatic oxidation of plastics, or aging.
Polymer antioxidants can effectively slow down the oxidation of the influence of polymer materials, improve the service life of polymer materials, especially the high temperature heat antioxidant ability, is the indispensable component polymer additives.
Usually high polymer antioxidants are free radical scavengers, mainly aromatic amines and phenols. The ability of amine to capture free radicals is stronger than phenol, but because the stable compounds produced are dark and toxic, they are quickly replaced by phenolic antioxidants in the plastics industry. In the early stage, phenolic antioxygenation agents were more than those with lower molecular weight and phenolic hydroxyl groups. Such as antioxidant 264, antioxidant 246, styrene phenol and so on.
Due to the poor compatibility of polymers and low molecular weight, the surface migration rate of the polymer is relatively fast, which can not be sustained for the protection of polymer materials. Therefore, a high molecular weight anti-oxidant, such as antioxidant 245, antioxidant 1076 and antioxidant 1010, has been used since then.
Due to the improvement of molecular weight, the performance of phenol antioxidant has been improved greatly compared with that of early inhibitors. In the same period, asymmetrical anti-oxidants with complex structure and high molecular weight were also present, such as ao-80. The half the combination of hindered phenol and screw ring diol structure, makes the product has good thermal stability and good compatibility with base material, oxygen and nitrogen oxide coloring resistance is excellent.
In recent years, more and more appear in the same molecule contains the heteroatom such as N, P, S composite antioxidants, such as 300, antioxidant 2246 and antioxidant, the multifunctional antioxidants in addition to its antioxidant activity also with impurity atoms produce synergistic effect, make its aging resistance, thermal stability, light stability, precipitation resistance, radiation resistance of multifunctional antioxidants.
In the early 1950s, our country began to produce anti-aging agent for rubber products, such as anti-aging agent and anti-oxidant. After that, there are also simple hindered phenol products to be put into production. High molecular weight retardation phenols were developed, such as antioxidant 1010, 1076, and thiol ester DLTP, i.e., dilauryl dipropionate and other products.
Triphenyl phosphite (TPPi antioxidants, stabilizer) is the main raw materials of phenol, phosphorus oxychloride, phosphorus trichloride, phosphorus oxychloride, phosphorus trichloride belong to highly toxic chemicals, state control chemicals. Through raw material phenol, triclosan phosphorous and trichloride phosphorus, the direct method of trichloro phosphorus is used to direct (also known as thermal) and the indirect method of trichloride phosphorus (also known as cold method).
According to the relevant state regulations, tppi is currently exported to 9 kinds of dangerous goods.
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 recent years the rapid development of ethylene industry in China, synthetic materials such as polyethylene, polyvinyl chloride (PVC) and polystyrene were developed composite materials are widely used in industry, agriculture, transportation, communication, and in all areas of People's Daily life. Plastic processing agent against oxygen demand increased dramatically to meet the requirements of plastic processing industry against deoxidant, must strengthen the research and development, increase the varieties of antioxidant and the scale of production, to meet the market demand.
Antioxidants are on the market at present esters hindered phenol, generally the last step of the synthesis of ester exchange reaction, the ester exchange method in the application of synthetic antioxidants, many scholars at home and abroad for study, research is focused on the choice of catalysts, because good catalyst can not only improve the conversion rate of raw material, and also is quite important for subsequent processing of reactant, can simplify the post-processing steps, improve the yield.
Currently, tin compounds are widely used as catalysts for ester exchange, including organic tin and inorganic tin. Inorganic tin, including tin oxide, tin oxide, and tin chloride, has been seldom used in recent years.
The organic tin classes have dibutyl tin oxide, dibutyl maleate, dichlorodibutyl tin, tin tributyl acetate, tin tributyl chloride and trimethyl chloride, dibutyl laurate, etc.
The catalyst ntcatao-70 has two advantages: ntcatao-70 can be completely substituted for conventional organic tin catalyst for all ester exchange reactions. The catalytic efficiency of ntcatao-70 is higher than that of conventional organic tin catalysts.
Plastic has excellent performance, variety and versatility. It can replace metal materials, cellulose materials and silicate materials used in three traditional materials, and as the most powerful traditional materials competitors. General plastics has been widely used in agriculture, light industry, textiles, electronic appliances, machinery, building materials, packaging and transportation and other departments, profound impact on industrial and agricultural production development and the progress of science and technology.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Polymer in the processing, storage and use process under the role of oxygen in the air, especially in the heat, light, or the presence of heavy metal ions, will accelerate degradation or crosslinking polymer molecular chain, leading to product impact strength, crooked strength, tensile strength, stretching rate and other physical and mechanical properties declined dramatically, which affect the normal use of polymer products. This phenomenon is known as the automatic oxidation of plastics, or aging.
Polymer antioxidants can effectively slow down the oxidation of the influence of polymer materials, improve the service life of polymer materials, especially the high temperature heat antioxidant ability, is the indispensable component polymer additives.
Usually high polymer antioxidants are free radical scavengers, mainly aromatic amines and phenols. The ability of amine to capture free radicals is stronger than phenol, but because the stable compounds produced are dark and toxic, they are quickly replaced by phenolic antioxidants in the plastics industry. In the early stage, phenolic antioxygenation agents were more than those with lower molecular weight and phenolic hydroxyl groups. Such as antioxidant 264, antioxidant 246, styrene phenol and so on.
Due to the poor compatibility of polymers and low molecular weight, the surface migration rate of the polymer is relatively fast, which can not be sustained for the protection of polymer materials. Therefore, a high molecular weight anti-oxidant, such as antioxidant 245, antioxidant 1076 and antioxidant 1010, has been used since then.
Due to the improvement of molecular weight, the performance of phenol antioxidant has been improved greatly compared with that of early inhibitors. In the same period, asymmetrical anti-oxidants with complex structure and high molecular weight were also present, such as ao-80. The half the combination of hindered phenol and screw ring diol structure, makes the product has good thermal stability and good compatibility with base material, oxygen and nitrogen oxide coloring resistance is excellent.
In recent years, more and more appear in the same molecule contains the heteroatom such as N, P, S composite antioxidants, such as 300, antioxidant 2246 and antioxidant, the multifunctional antioxidants in addition to its antioxidant activity also with impurity atoms produce synergistic effect, make its aging resistance, thermal stability, light stability, precipitation resistance, radiation resistance of multifunctional antioxidants.
In the early 1950s, our country began to produce anti-aging agent for rubber products, such as anti-aging agent and anti-oxidant. After that, there are also simple hindered phenol products to be put into production. High molecular weight retardation phenols were developed, such as antioxidant 1010, 1076, and thiol ester DLTP, i.e., dilauryl dipropionate and other products.
Triphenyl phosphite (TPPi antioxidants, stabilizer) is the main raw materials of phenol, phosphorus oxychloride, phosphorus trichloride, phosphorus oxychloride, phosphorus trichloride belong to highly toxic chemicals, state control chemicals. Through raw material phenol, triclosan phosphorous and trichloride phosphorus, the direct method of trichloro phosphorus is used to direct (also known as thermal) and the indirect method of trichloride phosphorus (also known as cold method).
According to the relevant state regulations, tppi is currently exported to 9 kinds of dangerous goods.
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 recent years the rapid development of ethylene industry in China, synthetic materials such as polyethylene, polyvinyl chloride (PVC) and polystyrene were developed composite materials are widely used in industry, agriculture, transportation, communication, and in all areas of People's Daily life. Plastic processing agent against oxygen demand increased dramatically to meet the requirements of plastic processing industry against deoxidant, must strengthen the research and development, increase the varieties of antioxidant and the scale of production, to meet the market demand.
Antioxidants are on the market at present esters hindered phenol, generally the last step of the synthesis of ester exchange reaction, the ester exchange method in the application of synthetic antioxidants, many scholars at home and abroad for study, research is focused on the choice of catalysts, because good catalyst can not only improve the conversion rate of raw material, and also is quite important for subsequent processing of reactant, can simplify the post-processing steps, improve the yield.
Currently, tin compounds are widely used as catalysts for ester exchange, including organic tin and inorganic tin. Inorganic tin, including tin oxide, tin oxide, and tin chloride, has been seldom used in recent years.
The organic tin classes have dibutyl tin oxide, dibutyl maleate, dichlorodibutyl tin, tin tributyl acetate, tin tributyl chloride and trimethyl chloride, dibutyl laurate, etc.
The catalyst ntcatao-70 has two advantages: ntcatao-70 can be completely substituted for conventional organic tin catalyst for all ester exchange reactions. The catalytic efficiency of ntcatao-70 is higher than that of conventional organic tin catalysts.
Plastic has excellent performance, variety and versatility. It can replace metal materials, cellulose materials and silicate materials used in three traditional materials, and as the most powerful traditional materials competitors. General plastics has been widely used in agriculture, light industry, textiles, electronic appliances, machinery, building materials, packaging and transportation and other departments, profound impact on industrial and agricultural production development and the progress of science and technology.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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