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Phosphoric acid ester auxiliary antioxidant
2018-1-16 12:16:16
Phosphoric acid ester auxiliary antioxidant
Phosphite ester auxiliary antioxidants play an important role in antioxidant system, auxiliary phosphite antioxidants in addition to the outstanding ability of decomposition of hydrogen peroxide (this is hindered phenol antioxidant cannot), as well as good color and luster protection ability, can be hindered phenol antioxidant was faded after oxidation dyeing group. In addition, it can improve the processing temperature of the polymer and have a good synergistic effect with the light stabilizer.
In PVC formulations generally think the phosphate rock mixture effect on main, it has no obvious effect of stability when used alone, but with the metal soap and after can complexing metal chlorides, improve heat resistance and weather resistance, transparency. It can also show synergies with organic tin and epoxy compounds.
It can reduce the amount of primary stabilizer, especially the expensive organic tin stabilizer. Organic phosphatide is widely used in liquid compound stabilizers, accounting for 10%~30% of the total amount. In the formulation of PVC products, especially in transparent products, there is a wide application, and the dosage is generally 0.3-1.0 PHR.
The various ways and mechanism of the stable PVC. There are several explanations of free radical mechanism, ion mechanism and single molecular mechanism. It is generally accepted that free radical chain reaction mechanism. According to the mechanism of the double bond and branched points existing in the PVC, remaining initiator end group, the structure of the oxygen and so on, by the heat or the light activated to produce free radicals, under the free radicals cause, PVC chain reaction dehydrochlorination and degradation.
PVC dehydrochloride forms a double bond. Due to the activity of allyl, the reaction continues to form a conjugate double bond, which becomes polyene structure and causes PVC discoloration. The new free radicals further induce the degradation of PVC and form a chain reaction, which aggravates the degradation of PVC.
Phosphite ester through different means and methods on the stability of PVC, cummings, kyle and Roy, a long, detailed research have been carried out such as per capita, they think mainly by Roman abramovich hour (Arbuzov) reaction, make PVC macromolecule prevents the initial coloring, and improve the thermal stability.
(1) capture the hydrogen chloride released in PVC degradation and inhibit its self-catalysis.
(2) replace the unstable allyl chloride atoms in PVC molecules and inhibit dehydrochlorination.
(3) passivation harmful metal ions: PVC resin or mixing materials containing metal ions such as Fe, Mn, etc., generated in the process of the thermal degradation of metal chlorides, especially ZnCI2, CdCI2 strongly promote the dehydrochlorination of PVC. The phosphatide can make these ions passivate and prevent the precipitation of the metal chloride, thus enhancing the transparency of PVC products. The phosphatides can be directly combined with metal salts to prevent metal chlorides, and can also be directly used for metal chloride.
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.
(4) antioxidation: because organic phosphatide is an auxiliary antioxidant, it can capture oxygen and decompose peroxide.
(5) inhibition of free radicals: the mechanism of the stabilizing effect of phosphatates in PVC is quite complex, which is difficult to tell which stability is large, and some is only a theoretical speculation. However, it is very effective to apply central Asian phosphatate as PVC anti-turbidity agent, regardless of whether the chemical ao cooperation is real or not. In addition, the phosphatide has a good effect on the transparency of PVC plastic containing lead salt, barium salt and calcium salt.
(6) it has excellent peeling, non-sticking roller and mould, increasing the production rate and inhibiting the production of the product.
As the most effective PVC stabilizer in organic auxiliary stabilizer, it is generally considered to have the following four functions:
(1) to prevent the catalytic degradation of metal chloride, thus improving the heat resistance and resistance of the polymer;
(2) the unstable allyl chloride, which is highly susceptible to the further deoxidation of hydrogen, is catalyzed by PVC molecules to produce phosphate and stabilize the product.
(3) as the acceptor of hydrogen chloride, the reaction produces oxygenane and acid-type phosphatate, which reacts with epoxide to produce new phosphatide;
(4) decomposition of hydrogen peroxides and hydrogen peroxide decomposition agents.
The use of Triphenyl phosphite is widely used, and it can eliminate free phenol, so that it does not harm the environment, health and safety. Phosphoric acid and trionyl phenyl ester are often used in the non-toxic fields recognized by the FDA.
All kinds of plastic products that have been added to the acid ester have been improved, the stability of heat resistance has improved, and the transparency has improved. However, the biggest disadvantage of organic phosphors is that they are easy to hydrolyze.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Phosphite ester auxiliary antioxidants play an important role in antioxidant system, auxiliary phosphite antioxidants in addition to the outstanding ability of decomposition of hydrogen peroxide (this is hindered phenol antioxidant cannot), as well as good color and luster protection ability, can be hindered phenol antioxidant was faded after oxidation dyeing group. In addition, it can improve the processing temperature of the polymer and have a good synergistic effect with the light stabilizer.
In PVC formulations generally think the phosphate rock mixture effect on main, it has no obvious effect of stability when used alone, but with the metal soap and after can complexing metal chlorides, improve heat resistance and weather resistance, transparency. It can also show synergies with organic tin and epoxy compounds.
It can reduce the amount of primary stabilizer, especially the expensive organic tin stabilizer. Organic phosphatide is widely used in liquid compound stabilizers, accounting for 10%~30% of the total amount. In the formulation of PVC products, especially in transparent products, there is a wide application, and the dosage is generally 0.3-1.0 PHR.
The various ways and mechanism of the stable PVC. There are several explanations of free radical mechanism, ion mechanism and single molecular mechanism. It is generally accepted that free radical chain reaction mechanism. According to the mechanism of the double bond and branched points existing in the PVC, remaining initiator end group, the structure of the oxygen and so on, by the heat or the light activated to produce free radicals, under the free radicals cause, PVC chain reaction dehydrochlorination and degradation.
PVC dehydrochloride forms a double bond. Due to the activity of allyl, the reaction continues to form a conjugate double bond, which becomes polyene structure and causes PVC discoloration. The new free radicals further induce the degradation of PVC and form a chain reaction, which aggravates the degradation of PVC.
Phosphite ester through different means and methods on the stability of PVC, cummings, kyle and Roy, a long, detailed research have been carried out such as per capita, they think mainly by Roman abramovich hour (Arbuzov) reaction, make PVC macromolecule prevents the initial coloring, and improve the thermal stability.
(1) capture the hydrogen chloride released in PVC degradation and inhibit its self-catalysis.
(2) replace the unstable allyl chloride atoms in PVC molecules and inhibit dehydrochlorination.
(3) passivation harmful metal ions: PVC resin or mixing materials containing metal ions such as Fe, Mn, etc., generated in the process of the thermal degradation of metal chlorides, especially ZnCI2, CdCI2 strongly promote the dehydrochlorination of PVC. The phosphatide can make these ions passivate and prevent the precipitation of the metal chloride, thus enhancing the transparency of PVC products. The phosphatides can be directly combined with metal salts to prevent metal chlorides, and can also be directly used for metal chloride.
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.
(4) antioxidation: because organic phosphatide is an auxiliary antioxidant, it can capture oxygen and decompose peroxide.
(5) inhibition of free radicals: the mechanism of the stabilizing effect of phosphatates in PVC is quite complex, which is difficult to tell which stability is large, and some is only a theoretical speculation. However, it is very effective to apply central Asian phosphatate as PVC anti-turbidity agent, regardless of whether the chemical ao cooperation is real or not. In addition, the phosphatide has a good effect on the transparency of PVC plastic containing lead salt, barium salt and calcium salt.
(6) it has excellent peeling, non-sticking roller and mould, increasing the production rate and inhibiting the production of the product.
As the most effective PVC stabilizer in organic auxiliary stabilizer, it is generally considered to have the following four functions:
(1) to prevent the catalytic degradation of metal chloride, thus improving the heat resistance and resistance of the polymer;
(2) the unstable allyl chloride, which is highly susceptible to the further deoxidation of hydrogen, is catalyzed by PVC molecules to produce phosphate and stabilize the product.
(3) as the acceptor of hydrogen chloride, the reaction produces oxygenane and acid-type phosphatate, which reacts with epoxide to produce new phosphatide;
(4) decomposition of hydrogen peroxides and hydrogen peroxide decomposition agents.
The use of Triphenyl phosphite is widely used, and it can eliminate free phenol, so that it does not harm the environment, health and safety. Phosphoric acid and trionyl phenyl ester are often used in the non-toxic fields recognized by the FDA.
All kinds of plastic products that have been added to the acid ester have been improved, the stability of heat resistance has improved, and the transparency has improved. However, the biggest disadvantage of organic phosphors is that they are easy to hydrolyze.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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