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Antioxidant synergies
2018-1-9 17:35:48
Antioxidant synergies
There are two main effects: synergistic effect and anti-synergistic effect. The combination of two or more antioxidants is called synergistic effect if it is better than one. If the effect is worse than the one used alone, it is called anti-synergistic effect.
Synergy antioxidants include collaborative intermolecular and intramolecular synergy, which intermolecular coordination is divided into the following two: (1) all synergy (ho - mo - synergism), refers to the oxidation mechanism of the same synergy antioxidants; (2) non-uniform synergism (heter-synergism) refers to the synergistic effect of antioxidants with different antioxidant mechanisms.
Synergism, also known as auto-synergism, refers to the synergistic effect of an antioxidant containing multiple functional groups.
The synergistic effect of hindered phenolic antioxidant agents. There are synergistic effects on the use of phenolic antioxygenated agents with different kinds of antioxygenation agents, and the antioxygenation of different phenols and phenols. AH is high resistance or low active antioxidant, BH is a small resistance or high active antioxidant, and BH is more responsive when reacting with peroxide free radicals.
Highly active antioxidant can effectively capture oxide free radical or superoxide free radicals, low active antioxidants could supply of hydrogen at this moment, make highly active antioxidants to regenerate, to keep the lasting antioxidant effectiveness, so this two kinds of antioxidants compound can produce synergies after use.
Synergistic effect between main and auxiliary antioxidants. An example of non-uniform synergistic effect of auxiliary antioxidant and main antioxidant. The experimental results show that there is synergistic effect between phenolic antioxidant and phosphatide. As the main antioxidant phenolic antioxidants, points are in the active hydrogen atoms (0 ~ H), the hydrogen atoms than those of the polymer chain (including carbon double bond in the chain of hydrogen) and lively, it can be out with macromolecular chain radical r. or R00., generate hydrogen peroxide and stable phenol oxygen free radicals (ArO).
Because of phenol oxygen free radicals ortho replace base to increase or the increase of its branches, or increase the space block effect, so that you can make it of the protection of the adjacent large volume groups and improve the stability of phenolic oxygen free radicals.
In addition, because of phenol with benzene ring oxygen free radicals in big conjugate system, which is stable, low activity, can trigger a chain reaction, can only be combined with another active free radicals, again to terminate a free radicals, generated a relatively stable compounds, ending a chain reaction. This stability of phenolic oxygen free radicals can prevent the oxidation of antioxidants from direct oxidation, and also reduce chain transfer reaction, thus improving their antioxidant properties.
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, when is given priority to with metal stabilizer, cooperate with this product can reduce the harm of metal chlorides, maintain product transparency, and inhibition of color change, is also a good chemical intermediates, with phosphorus-containing flame retardant and use, can play a role of flame retardant antioxidant, and with stable performance, light can be used for synthesis alkyd resin and polyester, main raw materials for resin, this product can also be preparing pesticide intermediates trimethyl phosphite.
In order to prevent a chain reaction, and the truncated chain extension reaction, still need to cooperate to use a kind of can break down large molecules of hydrogen peroxide R00H antioxidants, which make it generate stable compounds, to prevent the development of chain reaction, the decomposition of hydrogen peroxide antioxidant known as auxiliary antioxidant.
Therefore, the synergistic effect between the main antioxidant, auxiliary antioxidant and stabilizer can be combined into various effective compound stabilizers.
Many of the compound antioxidants sold now are the complex of blocked phenol and phosphatide, such as Irganox B series, which is a mixture of Irganox 1010, Irganox 1076, Irganox 1330 and Irganox 168. In addition, the compound products of semi-blocked phenol and sulfurate antioxidant are also available.
There have been many reports on the interaction between phenolic antioxidant and HALS in the interaction between phenolic antioxidant and HALS. The inhibition of phenolic antioxidant and HALS, most of which produce synergistic effect in the aging of thermal oxygen, and more anti-synergistic effect in photooxygen aging.
Causes of synergies. Luckietal think antioxidants can capture free radicals, but at the same time generate free radicals generating peroxide ROOR and ROOH, HALS can make the ROOR and ROOH inactivation, thus preventing their thermal decomposition or photolysis produce free radicals. The transition product of HALS, alkyl hydroxylamine and phenolic oxygen free radical reaction, can inhibit the regeneration of phenol.
Alien think, under the condition of the hot oxygen aging, can generate a high concentration of nitrogen and oxygen free radicals, it generated in play a stabilizing role of alkyl hydroxylamine in oven aging temperatures (130 ℃), easy pyrolysis or with oxygen free radical reaction, and regeneration of the nitrogen oxygen free radical, due to the mutual compensation of nitrogen oxygen free radicals and hindered phenol circulation, got two active chain termination agents regeneration and synergy.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
There are two main effects: synergistic effect and anti-synergistic effect. The combination of two or more antioxidants is called synergistic effect if it is better than one. If the effect is worse than the one used alone, it is called anti-synergistic effect.
Synergy antioxidants include collaborative intermolecular and intramolecular synergy, which intermolecular coordination is divided into the following two: (1) all synergy (ho - mo - synergism), refers to the oxidation mechanism of the same synergy antioxidants; (2) non-uniform synergism (heter-synergism) refers to the synergistic effect of antioxidants with different antioxidant mechanisms.
Synergism, also known as auto-synergism, refers to the synergistic effect of an antioxidant containing multiple functional groups.
The synergistic effect of hindered phenolic antioxidant agents. There are synergistic effects on the use of phenolic antioxygenated agents with different kinds of antioxygenation agents, and the antioxygenation of different phenols and phenols. AH is high resistance or low active antioxidant, BH is a small resistance or high active antioxidant, and BH is more responsive when reacting with peroxide free radicals.
Highly active antioxidant can effectively capture oxide free radical or superoxide free radicals, low active antioxidants could supply of hydrogen at this moment, make highly active antioxidants to regenerate, to keep the lasting antioxidant effectiveness, so this two kinds of antioxidants compound can produce synergies after use.
Synergistic effect between main and auxiliary antioxidants. An example of non-uniform synergistic effect of auxiliary antioxidant and main antioxidant. The experimental results show that there is synergistic effect between phenolic antioxidant and phosphatide. As the main antioxidant phenolic antioxidants, points are in the active hydrogen atoms (0 ~ H), the hydrogen atoms than those of the polymer chain (including carbon double bond in the chain of hydrogen) and lively, it can be out with macromolecular chain radical r. or R00., generate hydrogen peroxide and stable phenol oxygen free radicals (ArO).
Because of phenol oxygen free radicals ortho replace base to increase or the increase of its branches, or increase the space block effect, so that you can make it of the protection of the adjacent large volume groups and improve the stability of phenolic oxygen free radicals.
In addition, because of phenol with benzene ring oxygen free radicals in big conjugate system, which is stable, low activity, can trigger a chain reaction, can only be combined with another active free radicals, again to terminate a free radicals, generated a relatively stable compounds, ending a chain reaction. This stability of phenolic oxygen free radicals can prevent the oxidation of antioxidants from direct oxidation, and also reduce chain transfer reaction, thus improving their antioxidant properties.
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, when is given priority to with metal stabilizer, cooperate with this product can reduce the harm of metal chlorides, maintain product transparency, and inhibition of color change, is also a good chemical intermediates, with phosphorus-containing flame retardant and use, can play a role of flame retardant antioxidant, and with stable performance, light can be used for synthesis alkyd resin and polyester, main raw materials for resin, this product can also be preparing pesticide intermediates trimethyl phosphite.
In order to prevent a chain reaction, and the truncated chain extension reaction, still need to cooperate to use a kind of can break down large molecules of hydrogen peroxide R00H antioxidants, which make it generate stable compounds, to prevent the development of chain reaction, the decomposition of hydrogen peroxide antioxidant known as auxiliary antioxidant.
Therefore, the synergistic effect between the main antioxidant, auxiliary antioxidant and stabilizer can be combined into various effective compound stabilizers.
Many of the compound antioxidants sold now are the complex of blocked phenol and phosphatide, such as Irganox B series, which is a mixture of Irganox 1010, Irganox 1076, Irganox 1330 and Irganox 168. In addition, the compound products of semi-blocked phenol and sulfurate antioxidant are also available.
There have been many reports on the interaction between phenolic antioxidant and HALS in the interaction between phenolic antioxidant and HALS. The inhibition of phenolic antioxidant and HALS, most of which produce synergistic effect in the aging of thermal oxygen, and more anti-synergistic effect in photooxygen aging.
Causes of synergies. Luckietal think antioxidants can capture free radicals, but at the same time generate free radicals generating peroxide ROOR and ROOH, HALS can make the ROOR and ROOH inactivation, thus preventing their thermal decomposition or photolysis produce free radicals. The transition product of HALS, alkyl hydroxylamine and phenolic oxygen free radical reaction, can inhibit the regeneration of phenol.
Alien think, under the condition of the hot oxygen aging, can generate a high concentration of nitrogen and oxygen free radicals, it generated in play a stabilizing role of alkyl hydroxylamine in oven aging temperatures (130 ℃), easy pyrolysis or with oxygen free radical reaction, and regeneration of the nitrogen oxygen free radical, due to the mutual compensation of nitrogen oxygen free radicals and hindered phenol circulation, got two active chain termination agents regeneration and synergy.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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