Preparation method of epoxidized calcium zinc oleate for PVC heat stabilizer

Abstract

The invention discloses a preparation method of epoxidized calcium zinc oleate for a PVC heat stabilizer. The method comprises the following steps: S1, adding oleic acid, a solid metal oxide catalyst, formic acid and hydrogen peroxide into a reactor to obtain epoxidized oleic acid liquid; S2, adding an alkaline solution and a surfactant into the epoxidized oleic acid liquid reactor to obtain epoxidized sodium oleate saponification liquid; S3, neutralizing the epoxidized sodium oleate saponification liquid with dilute acid, adding a calcium / zinc ion-containing solution, cooling to normal temperature, discharging and filtering; and S4, drying a filter cake to constant weight to obtain an epoxidized calcium zinc oleate finished product. The prepared epoxidized calcium zinc oleate has high thermal stability and plasticizing performance, the epoxy value is obviously increased by adopting the solid metal oxide catalyst compared with common concentrated sulfuric acid and p-toluenesulfonic acid catalysts, and the catalyst is a metal compound and can be directly changed into a corresponding PVC stabilizer, a synergistic effect is achieved with epoxidized calcium zinc oleate, and the reaction rate is increased.

Description

technical field [0001] The invention relates to a preparation method of epoxidized calcium-zinc oleate for PVC heat stabilizers, and belongs to the technical field of synthesis of PVC processing aids. Background technique [0002] Polyvinyl chloride (PVC) is one of the five general-purpose resins in the world and one of the earliest industrialized resins. Its output is second only to polyethylene. It is widely used in various fields of people's lives because of its excellent performance and low price. However, due to the defects of its own structure, it is prone to dehydrochlorination reaction and degradation during the heating process. Therefore, heat stabilizers must be added in PVC processing applications. [0003] At present, the PVC heat stabilizers that have been industrialized mainly include lead salts, metal soaps, organotins, rare earths, and organic auxiliary heat stabilizers. Although these stabilizers have their own advantages, there are many disadvantages such...

AI Technical Summary

Problems solved by technology

Although these stabilizers have their own advantages, they have many disadvantages such as toxicity, high price and poor stabilization efficiency.

Therefore, it is very necessary to develop a multifunctional, non-toxic, and reasonably priced heat stabilizer, and the traditional stabilizer is compounded with zinc stearate and calcium stearate, which has poor compatibility with PVC, and the synergistic effect has not reached the best.