Calcium-zinc composite stabilizer for plastic pipe production, and preparation method thereof

Abstract

The present invention relates to a calcium-zinc composite stabilizer for plastic pipe production, and a preparation method thereof. The calcium-zinc composite stabilizer is prepared from the following raw materials by weight: 30-70 parts of basic zinc calcium phosphite, 10-35 parts of zinc calcium silicate, 20-53 parts of a layered dihydroxy composite metal oxide, 8-32 parts of a metal hydroxide, 2-4 parts of a surfactant, 15-35 parts of an auxiliary stabilizer, and 10-35 of a lubricant. The preparation method comprises: 1) carrying out a reaction to synthesize basic zinc calcium phosphate; 2) carrying out surface treatment; 3) compounding; and 4) carrying out sheet forming and breaking. According to the present invention, the calcium-zinc composite stabilizer has advantages of good stability, sulfidization pollution resistance, less consumption, good thermal stability superior to the traditional lead salt composite stabilizer, good weathering resistance, long mold cleaning period, excellent physical property of the product, and the like; during the production process, no three-waste is generated, and no dust is generated during the application; the calcium-zinc composite stabilizer further has characteristics of low production cost, easily-available raw materials, significant economic benefits, significant social benefits and significant environmental benefits, and can widely replace the traditional lead salt composite stabilizer and the organotin stabilizer.

Description

Technical field [0001] The invention relates to a composite stabilizer, in particular to a calcium-zinc composite stabilizer for plastic pipes suitable for making plastic pipes, such as PVC pipes, PE pipes and the like, and a preparation method thereof. Background technique [0002] PVC and PE are general-purpose plastics with the largest output and consumption. The world's PVC output has exceeded 100 million tons, and my country's 17.8 million tons. Due to the poor thermal stability and processing difficulties of PVC, about 4% of heat stabilizer must be added during molding and processing. my country consumes about 700,000 tons of heat stabilizer each year. Traditionally, heat stabilizers are mainly lead salt heat stabilizers. Because lead salt stabilizers are highly toxic, bioaccumulative, and easy to generate dust, they will cause chronic problems for operators during production and use. Lead is poisoned, and will cause serious environmental pollution after being discarded. ...

AI Technical Summary

Problems solved by technology

However, calcium-zinc heat stabilizers still have defects such as poor stabilizing effect, initial coloring, and "zinc burning", and the application effect is not ideal, so it is difficult to replace lead salt heat stabilizers, and auxiliary heat stabilizers need to be synergistic

[0003] Composite heat stabilizers are a development trend due to their excellent performance and good environmental protection performance. However, existing composite heat stabilizers (such as lead salt composite stabilizers and organotin stabilizers) have higher production costs and contain certain Toxicity, toxic wastewater and waste gas will be produced during the production process, which will pollute the environment and affect human health