News Details
Hindered phenolic antioxidants
2017-12-28 15:38:12
Hindered phenolic antioxidants
The antioxidant mechanism of chain termination agent is the main antioxidant system, called antioxidants, antioxidant, polypropylene is the phenolic, according to the structure can be divided into single phenol, bisphenol A, three phenols, polyphenols, hydroquinone, thiobisphenol and other types of phenols is mainly in the resistance of phenolic structures. Due to phenolic hydroxyl group ortho para tert butyl electron repelling effect, and significantly enhanced, easy to provide active H atom combined with free radicals, free radical species of phenol itself is formed with low activity and high stability.
The hindered phenolic antioxidant is a phenolic compound with a space hindered structure. The main types of antioxidant tether termination. According to the number of hindered phenolic functional groups in the molecule, it is generally divided into one element hindered phenol and multiple hindered phenol. The hindered phenolic antioxidants are mostly used in plastic products, which show the synergistic effect with the auxiliary antioxidants such as phosphite and thioether. The representative varieties of 2,8 tert butyl -4 methyl phenol, antioxidant lU1U, antioxidant lU6.
Phenol radicals through a series of changes after the combination of a ROO free radical generated quinone peroxide, its poor thermal stability; or self assemble into p-benzoquinone type peroxides, showing the color, usually yellow, the color pollution in polypropylene products, so the phenol has some limitations in application.
Common varieties of phenolic antioxidant antioxidant 1010, antioxidant 1076 and CA; as the basic varieties of phenolic antioxidant 2, 6- di Ding Jifen (BHT), because of low molecular weight, volatile, and yellow discoloration and other shortcomings, the amount is reduced year by year.
The consumption ratio of high molecular weight blocked phenol, represented by 1010 and 1076, is increasing year by year, and it has become the leading product in the market of phenolic antioxidants.
With the development of science and technology, many non symmetrical hindered phenolic antioxidants are constantly developing and production, compared with the traditional products showed more excellent thermal stability and resistance to discoloration, represents the trend of the world in the field of polymer oxidation, a novel antioxidant with the structure of Cyanoxl1790, Irganox245, SumilizerGA/MarkAO-80 etc..
In addition, in order to meet the requirements of recycled plastics and engineering plastics processing, high molecular weight and efficient antioxidants will become one of the mainstream of future development, such as Topanol205, AntioxidantHPM-12 and Irganox1425.
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.
Polymerization type and reaction type hindered phenolic antioxidant product development is also very active, Silanox is the latest type polymerization of phenolic antioxidants; phenolic antioxidants Anox20, mainly used for polyolefin and styrenic polymers, has excellent antioxidant capacity; Luchemao-R300 products with reactive hydrazine groups, in the processing conditions directly bonded to the the polymer backbone, keep the anti oxygen stable lasting effect, become the best performance of reactive hindered phenolic antioxidant.
There are many kinds of polymer stabilisation auxiliaries, and their functions are different. However, a large number of research results show that there may be synergistic or antagonistic effects between different types, even the same type and different antioxidants. The research of Irganox B series composite antioxidants shows that the proper combination of antioxidants can not only improve the performance of products, enhance the effect of oxygen resistance, but also reduce the cost, but if they are mismatched, they will not only play an anti oxidant role, but also accelerate the aging of polymers.
Hindered phenolic antioxidants have attracted much attention in recent years because of their advantages of good oxygen resistance, high thermal stability and low toxicity. However, whether the antioxidant compound is appropriate or not has a direct effect on the effect of oxygen resistance. Therefore, it is very important to study the mechanism of antioxidant action. In recent years, the world's major antioxidants manufacturers are committed to research and develop composite antioxidants, and the mechanism of synergism between various antioxidants is of great guiding significance for the development of new antioxidants.
The mechanism of inhibition of phenolic antioxidants. In the process of high temperature processing or use of polymer materials, the oxidative degradation of oxygen atoms will occur because of the attack of oxygen atoms. After years of research, it is found that the A dynamic oxidation process of the polymer is a series of A by the basic reaction process. The main product in the initial stage of the reaction is that hydrogen peroxide is decomposed into active free radicals under appropriate conditions. The radical reacts with macromolecular hydrocarbon or oxygen to form new free radicals. This cycle starts again and again, so that the oxidation reaction proceeds according to the radical chain process.
Adding antioxidants to polymers is to capture free radicals R. and R00 formed in the chain reaction stage, so that they do not cause destructive chain reactions. Antioxidants can also decompose hydroperoxide RO0H to make stable inactive products.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
The antioxidant mechanism of chain termination agent is the main antioxidant system, called antioxidants, antioxidant, polypropylene is the phenolic, according to the structure can be divided into single phenol, bisphenol A, three phenols, polyphenols, hydroquinone, thiobisphenol and other types of phenols is mainly in the resistance of phenolic structures. Due to phenolic hydroxyl group ortho para tert butyl electron repelling effect, and significantly enhanced, easy to provide active H atom combined with free radicals, free radical species of phenol itself is formed with low activity and high stability.
The hindered phenolic antioxidant is a phenolic compound with a space hindered structure. The main types of antioxidant tether termination. According to the number of hindered phenolic functional groups in the molecule, it is generally divided into one element hindered phenol and multiple hindered phenol. The hindered phenolic antioxidants are mostly used in plastic products, which show the synergistic effect with the auxiliary antioxidants such as phosphite and thioether. The representative varieties of 2,8 tert butyl -4 methyl phenol, antioxidant lU1U, antioxidant lU6.
Phenol radicals through a series of changes after the combination of a ROO free radical generated quinone peroxide, its poor thermal stability; or self assemble into p-benzoquinone type peroxides, showing the color, usually yellow, the color pollution in polypropylene products, so the phenol has some limitations in application.
Common varieties of phenolic antioxidant antioxidant 1010, antioxidant 1076 and CA; as the basic varieties of phenolic antioxidant 2, 6- di Ding Jifen (BHT), because of low molecular weight, volatile, and yellow discoloration and other shortcomings, the amount is reduced year by year.
The consumption ratio of high molecular weight blocked phenol, represented by 1010 and 1076, is increasing year by year, and it has become the leading product in the market of phenolic antioxidants.
With the development of science and technology, many non symmetrical hindered phenolic antioxidants are constantly developing and production, compared with the traditional products showed more excellent thermal stability and resistance to discoloration, represents the trend of the world in the field of polymer oxidation, a novel antioxidant with the structure of Cyanoxl1790, Irganox245, SumilizerGA/MarkAO-80 etc..
In addition, in order to meet the requirements of recycled plastics and engineering plastics processing, high molecular weight and efficient antioxidants will become one of the mainstream of future development, such as Topanol205, AntioxidantHPM-12 and Irganox1425.
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.
Polymerization type and reaction type hindered phenolic antioxidant product development is also very active, Silanox is the latest type polymerization of phenolic antioxidants; phenolic antioxidants Anox20, mainly used for polyolefin and styrenic polymers, has excellent antioxidant capacity; Luchemao-R300 products with reactive hydrazine groups, in the processing conditions directly bonded to the the polymer backbone, keep the anti oxygen stable lasting effect, become the best performance of reactive hindered phenolic antioxidant.
There are many kinds of polymer stabilisation auxiliaries, and their functions are different. However, a large number of research results show that there may be synergistic or antagonistic effects between different types, even the same type and different antioxidants. The research of Irganox B series composite antioxidants shows that the proper combination of antioxidants can not only improve the performance of products, enhance the effect of oxygen resistance, but also reduce the cost, but if they are mismatched, they will not only play an anti oxidant role, but also accelerate the aging of polymers.
Hindered phenolic antioxidants have attracted much attention in recent years because of their advantages of good oxygen resistance, high thermal stability and low toxicity. However, whether the antioxidant compound is appropriate or not has a direct effect on the effect of oxygen resistance. Therefore, it is very important to study the mechanism of antioxidant action. In recent years, the world's major antioxidants manufacturers are committed to research and develop composite antioxidants, and the mechanism of synergism between various antioxidants is of great guiding significance for the development of new antioxidants.
The mechanism of inhibition of phenolic antioxidants. In the process of high temperature processing or use of polymer materials, the oxidative degradation of oxygen atoms will occur because of the attack of oxygen atoms. After years of research, it is found that the A dynamic oxidation process of the polymer is a series of A by the basic reaction process. The main product in the initial stage of the reaction is that hydrogen peroxide is decomposed into active free radicals under appropriate conditions. The radical reacts with macromolecular hydrocarbon or oxygen to form new free radicals. This cycle starts again and again, so that the oxidation reaction proceeds according to the radical chain process.
Adding antioxidants to polymers is to capture free radicals R. and R00 formed in the chain reaction stage, so that they do not cause destructive chain reactions. Antioxidants can also decompose hydroperoxide RO0H to make stable inactive products.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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