High-quality modifier for PVC (Polyvinyl Chloride) processing and preparation process thereof

Abstract

The invention provides a high-quality modifier for PVC (Polyvinyl Chloride) processing and a preparation process thereof. The modifier comprises a component A, a component B and an additive C, whereinthe component A is prepared from the following raw materials: brucite, diatomite-supported heteropoly acid and composite surfactant; the component B is prepared from the following raw materials: polyimide, thermoplastic phenolic resin and cellulose acetate propionate; the additive C includes a dispersant and a lubricant; the mass ratio of the component A to the component B is 1 to (1 to 2); the mass of the additive C is 3 to 7 percent of the total mass of the component A and the component B. Through special multi-component compounding and improvements on process steps and parameters, the high-quality modifier has the advantages of high reactivity among raw materials, high structural stability, excellent flame retardancy, stability and mechanical property, high efficiency and environmentalfriendliness. When the high-quality modifier is used in the processing and production of PVC, the dispersibility, flame retardancy, weatherability, toughness and the like of products are significantly improved, and the comprehensive quality is significantly improved.

Description

technical field [0001] The invention relates to the technical field of plastic processing aids, in particular to a high-quality modified modifier for PVC processing and a preparation process thereof. Background technique [0002] Polyvinyl chloride (PVC) can be divided into two categories: hard and soft. The chlorine content of PVC is as high as 56.8%, and its oxygen index (OI) is 45-49%. Therefore, it is not necessary to add flame retardants for flame retardancy. However, a large amount of plasticizer is added to soft PVC, the chlorine content can be reduced to about 36%, and the oxygen index can be reduced to about 22%, so it must be flame retardant. Due to the large amount of smoke produced by PVC, whether it is hard or soft PVC, if it is to be flame retardant, a smoke suppressant must be added. Flame retardants that can be used for soft PVC flame retardant include antimony trioxide (Sb 2 o 3 ), aluminum hydroxide, zinc borate, phosphate ester, chlorinated paraffin, re...

AI Technical Summary

Problems solved by technology

However, the polarity of magnesium hydroxide flame retardant is very strong, the surface has a positive charge, is hydrophilic, and is easy to agglomerate, and has poor compatibility with polymer materials. It is difficult to process when blended with PVC, making PVC materials The tensile strength, elongation, tear strength and other indicators are greatly reduced, which affects the physical and mechanical properties of PVC materials.

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