Method for preparing flaky calcium-zinc stabilizer

Abstract

The invention discloses a method for preparing flaky calcium-zinc stabilizer. The method comprises the following raw material components in parts by weight: 31.25 parts of stearic acid, 1.5 parts of calcium hydroxide, 3.5 parts of zinc oxide, 6.97 parts of auxiliary stabilizer, 53.97 parts of filler, 13.25 parts of catalyst and 0.7 part of water. According to the flaky calcium-zinc stabilizer, calcium and zinc are adopted as main elements to replace lead salt stabilizers, the acute nodes of a polar group and PVC resin have relatively strong affinity due to relatively large electronegativity inthe plasticizing process to form a compound with relatively strong bond energy, so that the attraction of the ionic bond in each layer of PVC can be weakened or eliminated, mutually winding chain segments of PVC can be easily scattered, the boundary among molecular groups can easily disappear, PVC resin plasticization can be promoted, the PVC product performance can be improved, mechanical abrasion can be reduced, and the service life of downstream equipment can be prolonged; and the stabilizer has the advantages of no toxicity, harmlessness and no dust pollution, has relatively high stability and lubrication, and can be used for preparing PVC products with relatively good dispersion, compatibility and relatively high smoothness.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation method of a flaky calcium-zinc stabilizer, in particular to a preparation method of a flaky calcium-zinc stabilizer applied in the PVC industry and artificial leather. Background technique [0002] PVC (polyvinyl chloride) is one of the five largest synthetic resins used in the world. It is a thermoplastic linear polymer produced by free radical polymerization of vinyl chloride monomer. PVC material has the advantages of high strength, low price, good chemical corrosion resistance, good electrical insulation and difficult to burn, and is easy to process. It can be processed by molding, lamination, injection molding and other methods. It is widely used in engineering construction, Hard and soft products in food packaging, electrical and other industries. With the further expansion of application fields, the demand for PVC will continue to increase. [000...

AI Technical Summary

Problems solved by technology

[0005] At present, the most widely used stabilizer in the PVC industry is lead sulfate tribasic, generally referred to as lead salt. The effective lead content of lead salt is higher. Although it shows better thermal stability than other products, lead salt The main problems and shortcomings of the stabilizer are as follows: one is that the lead salt stabilizer is poisonous. Due to the high lead content of PVC products produced using the lead salt stabilizer, many countries have revised the lead content standards in drinking water. It is impossible to use lead salts in the environment, and the toxicity of toxic lead salt stabilizers limits its application in many occasions with strict hygiene requirements; second, the stabilizers currently on the market are mainly in powder form, although they are easy to process. However, due to the large amount of dust produced in the processing, the dust will cause greater harm to the human respiratory tract and the environment; the third is that the general lead salt is only attached to the surface of the PVC particles so that the dispersibility of the salt lead is poor, and its effect is equivalent to hindering PVC particles. The fusion will significantly delay plasticization, reduce the friction between PVC particles, reduce the shearing effect in PVC, and reduce the load on processing equipment; if the amount of lead salt is more, the finer the lead salt particles, the more obvious this effect , This has caused the problems of large equipment loss and high machine elimination rate in downstream processing enterprises, and reduced the performance of PVC products, increased mechanical wear, and reduced the service life of equipment