Self-stabilizing polyvinyl chloride resin preparation method

Abstract

The invention discloses a self-stabilizing polyvinyl chloride resin preparation method, wherein the self-stabilizing polyvinyl chloride resin is prepared from the following production raw materials byweight: 100-200 parts of deionized water, 100 parts of vinyl chloride, 0.006-0.02 part of a dispersing agent, 0.008-0.015 part of an initiator, 0.008-0.03 part of a heat stabilizer, 0.002-0.01 part of an antioxidant, 0.003-0.01 part of a pH regulator and 0.008-0.02 part of a terminating agent, wherein the heat stabilizer is an epoxy compound stabilizer. According to the invention, the epoxy compound heat stabilizer is added during the preparation of the polyvinyl chloride resin, wherein the epoxy compound heat stabilizer as the auxiliary stabilizer only has the common stabilizing effect, thesteric hindrance of the epoxy group of the heat stabilizer is large, and under the synergistic effect of the epoxy compound heat stabilizer, the antioxidant, the terminating agent and the like added during the preparation of the polyvinyl chloride resin, HCl released by the degradation of PVC is effectively absorbed, the catalytic effect of HCl to the degradation of PVC is inhibited, the decomposition reaction of the polyvinyl chloride resin in the forming processing process is effectively prevented, and the excellent thermal stability effect is achieved.

Description

technical field

[0001] The invention relates to the field of polyvinyl chloride resin synthesis, in particular to a self-stabilizing polyvinyl chloride resin and a preparation method thereof. Background technique

[0002] During the processing of polyvinyl chloride resin (PVC resin), the temperature is usually above 150°C, while PVC resin begins to decompose at 120°C, releasing HCL gas. If the decomposition is not inhibited, HCL will promote the decomposition and accelerate the decomposition process of PVC resin. A series of chain reactions caused by the de-HCL reaction finally lead to the breakage of the macromolecular chain, resulting in discoloration of the material and poor performance, which is a defect of polyvinyl chloride resin. In order to solve the problem of poor thermal stability of PVC in the processing industry, heat stabilizers are usually added during the molding process to prevent or delay the decomposition reaction of PVC products during the molding process...

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