Poly vinyl chloride (PVC) processing molding composite heat stabilizer composition and preparation method thereof

Abstract

The invention discloses a poly vinyl chloride (PVC) processing molding composite heat stabilizer composition and a preparation method thereof. The PVC processing molding composite heat stabilizer composition consists of the following raw materials in part by mass: 20 to 50 parts of substrate resin, 5 to 30 parts of organic stibium heat stabilizer, 5 to 10 parts of macromolecular epoxy compound, 5to 30 parts of ultraviolet light absorber, 5 to 30 parts of calcium stearate, 5 to 30 parts of C2-6 calcium carboxylate, 1 to 15 parts of C2-6 zinc carboxylate, 5 to 20 parts of hindered phenol antioxidant, 0 to 5 parts of beta-diketone and 1 to 5 parts of organic chelating agent. The obtained PVC processing molding composite heat stabilizer composition has relatively lower toxicity, low cost andrelatively higher light resistance, and avoids the precipitation phenomenon of auxiliary agents; in addition, in the extrusion processing of PVC adopting the composite heat stabilizer composition, processing current is effectively reduced, so that energy consumption is low.

Description

technical field [0001] The invention relates to a composite thermal stabilizer composition for PVC processing and molding and a preparation method thereof. Background technique [0002] Polyvinyl chloride (PVC) resin is a widely used thermoplastic general-purpose plastic, but due to its poor thermal stability, a certain amount of heat stabilizer must be added during processing to meet the molding requirements. At present, the most important PVC heat stabilizers are: lead salts, metal soaps, organic tin, rare earth, organic antimony and organic auxiliary heat stabilizers. Among them, lead salt heat stabilizers are restricted in use by many countries or industries because of their high toxicity; metal soaps are poor in effect when used alone, and there is also cadmium pollution; organic tins are expensive and produce peculiar smells during PVC processing; rare earths are A new type of PVC heat stabilizer. At present, my country has adopted a relatively strict management system...

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Problems solved by technology

Among them, lead salt heat stabilizers are restricted in use by many countries or industries because of their high toxicity; metal soaps are poor in effect when used alone, and there is also cadmium pollution; organic tins are expensive and produce peculiar smells during PVC processing; rare earths are A new type of PVC heat stabilizer. At present, my country has adopted a relatively strict management system for rare earth resources, which will have a certain impact on its development; organic antimony has poor light resistance

In addition, due to the poor compatibility between the general heat stabilizer and PVC resin, the heat stabilizer will be precipitated with the prolongation of use time.

In addition, when the general PVC heat stabilizer is added to PVC, the processing current of the twin-screw cannot be reduced well, that is, the energy consumption cannot be reduced well.

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