Application of a kind of dipyridyl phosphite in PVC heat stabilizer

Abstract

The invention relates to the application of bipyridine ester phosphite to a PVC heat stabilizer. bipyridine ester phosphite can be applied to preparation of a liquid barium-zinc stabilizer, a liquid barium-cadmium-zinc stabilizer and a liquid calcium-zinc stabilizer. The liquid barium-zinc stabilizer is prepared from, by weight, 40-50 parts of barium isotanoate, 10-15 parts of zinc-based complex, 5-10 parts of bipyridine ester phosphite, 2-7 parts of 2-ethyl acetyl benzoyl methane, 1-10 parts of thiodipropionicacid dilauryl ester and 10-20 parts of tripropylene glycol n-butyl ether. The bipyridine ester phosphite compound has a higher anti-precipitation property than aliphatic or aromatic phosphite ester by means of a novel heterocyclic perssad replacing the aliphatic or aromatic perssad during preparation of the liquid barium-zinc stabilizer, the liquid barium-cadmium-zinc stabilizer and the liquid calcium-zinc stabilizer. By introducing nitrogen atoms to the heterocyclic ring, the auxiliary stabilization effect on phosphite ester is improved remarkably, and then the printing performance and stability of a modified PVC product are improved.

Description

technical field [0001] The invention relates to the application of dipyridyl phosphite in PVC heat stabilizers. Background technique [0002] Polyvinyl chloride (PVC) is the second largest plastic species next to polyethylene. It has high strength, excellent corrosion resistance and insulation. Its products are widely used in construction, electrical appliances, toys, packaging and other industries. However, PVC has its structural defects. It is unstable when heated and decomposes to release hydrogen chloride gas. The solution is to add heat stabilizers to PVC processing. Liquid compound stabilizer has been more and more widely used in soft PVC products because of its advantages of no dust pollution in the production and application process, convenient measurement and low price. [0003] Due to the poor compatibility of metal soap and PVC resin in traditional liquid stabilizers, metal soap is continuously precipitated during the PVC calendering process, and the precipitates...

AI Technical Summary

Problems solved by technology

[0003] Due to the poor compatibility of metal soap and PVC resin in traditional liquid stabilizers, metal soap is continuously precipitated in the process of PVC calendering, and the precipitate is attached to the surface of the PVC film, which affects the printing, inkjet and transparency of the product; secondly At present, the liquid composite heat stabilizers mainly use fatty acid calcium salt and fatty acid zinc salt as the main stabilizers. Obvious problems such as pressure segregation and blooming

This is mainly due to the fact that traditional liquid stabilizers use aliphatic or aromatic phosphorous acid as an anti-separation agent, which has poor anti-separation performance and auxiliary stability performance, which ultimately limits the wide application of liquid stabilizers in the PVC field.

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