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It ACTS as an auxiliary antioxidant
2018-1-17 11:24:45
It ACTS as an auxiliary antioxidant
As auxiliary antioxidant phosphite ester structure, R1, R2, R3 for the same or different alkyl or aryl, according to the theory of atomic structure, phosphorus element d orbitals can participate in the hybrid process, after its P orbitals overlapping with other atoms tend to form stable Pd key, in general, trivalent phosphorus oxide P = O bond energy is as high as 502 ~ 712 kj/mo, l phosphite ester oxide P = O bond energy is as high as 611 kj/mo, mark the phosphite compounds with strong oxidation reduction effect, but the nucleophilic effect of phosphorus and its volume is bigger, so as the auxiliary antioxidant phosphite are exist in different degrees of hydrolytic stability.
It can effectively inhibit hydrolysis, Ethanox The hydrolytic stability of F atom with strong electronegative properties was introduced in the structure of bisphenol phosphite, which can be used in the stabilization of water-bearing system polymers.
Holcik such as measuring the ratios of different phosphite ester decomposition rate of hydrogen peroxide, found thatalkanes heartland of phosphate ester decomposition rate of ROOH big Yu Fang heartland of phosphate, but found in practical use, the stability of the heartland of phosphate is better, the main reason is that alkyl class antioxidant to heat, water stability, easy volatile, in storage, processing and use of extraction and hydrolysis losses, at the same time by its stability mechanism known alkyl classes in at the same time, give play to the role of stabilization can also cause free radical reaction, hampered by phosphite aryl esters can be not only decomposition of hydrogen peroxide, also has the function of chain termination agent.
As auxiliary antioxidant phosphite usually pay attention to overcome the shortcomings, such as the increase of molecular weight to improve its resistance to volatile, extraction resistance, twin screw structure are introduced to improve the thermal stability, increase P atoms surrounding space steric hindrance to improve hydrolytic stability.
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.
Triphenyl phosphite (antioxidant, stabilizer TPPi)
Packing method: net weight of 200KG/galvanized iron bucket (a small cabinet to hold 16 tons), 1000KG/IB (a small container with 18 tons) or 23 tons of it.
Port of shipment: Shanghai port
Price quotation validity: 15 days
Warehouse time: within 15 days (customs clearance)
Export rights: our own right to import and export.
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 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.
(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.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
As auxiliary antioxidant phosphite ester structure, R1, R2, R3 for the same or different alkyl or aryl, according to the theory of atomic structure, phosphorus element d orbitals can participate in the hybrid process, after its P orbitals overlapping with other atoms tend to form stable Pd key, in general, trivalent phosphorus oxide P = O bond energy is as high as 502 ~ 712 kj/mo, l phosphite ester oxide P = O bond energy is as high as 611 kj/mo, mark the phosphite compounds with strong oxidation reduction effect, but the nucleophilic effect of phosphorus and its volume is bigger, so as the auxiliary antioxidant phosphite are exist in different degrees of hydrolytic stability.
It can effectively inhibit hydrolysis, Ethanox The hydrolytic stability of F atom with strong electronegative properties was introduced in the structure of bisphenol phosphite, which can be used in the stabilization of water-bearing system polymers.
Holcik such as measuring the ratios of different phosphite ester decomposition rate of hydrogen peroxide, found thatalkanes heartland of phosphate ester decomposition rate of ROOH big Yu Fang heartland of phosphate, but found in practical use, the stability of the heartland of phosphate is better, the main reason is that alkyl class antioxidant to heat, water stability, easy volatile, in storage, processing and use of extraction and hydrolysis losses, at the same time by its stability mechanism known alkyl classes in at the same time, give play to the role of stabilization can also cause free radical reaction, hampered by phosphite aryl esters can be not only decomposition of hydrogen peroxide, also has the function of chain termination agent.
As auxiliary antioxidant phosphite usually pay attention to overcome the shortcomings, such as the increase of molecular weight to improve its resistance to volatile, extraction resistance, twin screw structure are introduced to improve the thermal stability, increase P atoms surrounding space steric hindrance to improve hydrolytic stability.
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.
Triphenyl phosphite (antioxidant, stabilizer TPPi)
Packing method: net weight of 200KG/galvanized iron bucket (a small cabinet to hold 16 tons), 1000KG/IB (a small container with 18 tons) or 23 tons of it.
Port of shipment: Shanghai port
Price quotation validity: 15 days
Warehouse time: within 15 days (customs clearance)
Export rights: our own right to import and export.
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 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.
(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.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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