Preparation method and application of zinc-aluminum-magnesium hydrotalcite-based PVC complex heat stabilizer

Abstract

The invention relates to synthesis of novel zinc-aluminum-magnesium hydrotalcite and preparation of a PVC complex heat stabilizer from the hydrotalcite and calcium soap, zinc soap and the like according to a certain ratio. The complex heat stabilizer comprises the main components shown in the description, wherein X is more than or equal to 0.25 and less than or equal to 0.5, n is more than or equal to 0 and less than or equal to 0.1, and m is more than or equal to 0 and less than or equal to 4; while the popular hydrotalcite in market at present has the general molecular formula shown in the description. The complex heat stabilizer prepared from the hydrotalcite has the advantages of higher initial hue and long-lasting heat stability for PVC and other chlorine-containing high polymers, and has the characteristics of no toxin, no pollution, low cost, rich raw materials and the like.

Description

Technical field: The invention relates to synthesizing a novel zinc-magnesium-aluminum hydrotalcite for preparing a PVC composite heat stabilizer. Background technique: As we all know, PVC is easy to decompose under the condition of processing temperature, and a stabilizer must be added to make it process smoothly. A lot of research work has been done on the stabilization of PVC at home and abroad. So far, the widely used heat stabilizers are mainly basic lead salts, metal soaps (Ba, Cd, Ca, Zn), organotin compounds, etc. Lead and cadmium compounds are highly toxic to human health and pollute the environment. Organotin is expensive and has an odor. Now the non-toxic calcium and zinc composite stabilizer is a popular product, but the thermal stability of calcium and zinc soap-based stabilizers is not good, and people are looking for better new materials to cooperate with calcium and zinc soap. Heat stabilizers. Therefore, hydrotalcite, a new functional material, is applied...

AI Technical Summary

Problems solved by technology

Lead and cadmium compounds are highly toxic to human health and pollute the environment. Organotin is expensive and has an odor

Now the non-toxic calcium and zinc composite stabilizer is a popular product, but the thermal stability of calcium and zinc soap-based stabilizers is not good, and people are looking for better new materials to cooperate with calcium and zinc soap. Heat stabilizers

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