Low-cost environment-friendly injection-molding high heat-resistant high impact-resistant rigid polyvinyl chloride composite and preparation method thereof

Abstract

The invention discloses a low-cost environment-friendly injection-molding high heat-resistant high impact-resistant rigid polyvinyl chloride composite and a preparation method thereof. The composite is prepared from the following raw materials in part by weight: 100 parts of medium-low polymerization degree polyvinyl chloride, 10 to 100 parts of high polymerization degree polyvinyl chloride, 4 to 100 parts of impact-resistant modifier, 5 to 50 parts of nano rigid particle, 1 to 5 parts of lanthanum tin compound stabilizer, 1 to 3 parts of acrylate processing aid, 1 to 10 parts of internal lubricant and 0.3 to 2 parts of external lubricant. The low-cost environment-friendly injection-molding high heat-resistant high impact-resistant rigid polyvinyl chloride composite is prepared by the steps of: performing mechanochemistry treatment on the polyvinyl chloride and the aid in a high-speed mixer through new technology; and pelleting by using a cone-shaped double-screw extruder. The compatibility between the polyvinyl chloride and the aid is improved through the new technology, the problem that the conventional nano particles easily agglomerate and have poor compatibility between a heat-resistant modifier and a substrate so as to reduce the mechanical property is solved, and the product has the advantages of high heat resistance, high toughness and good comprehensive mechanical property.

Description

technical field [0001] The invention relates to a low-cost, environment-friendly, high-heat-resistant and high-impact rigid polyvinyl chloride compound capable of injection molding and a preparation method. Background technique [0002] Polyvinyl chloride is one of the commonly used general-purpose plastics. It has the advantages of low price, flame retardancy, high chemical resistance, good mechanical strength and electrical insulation, and wide source of raw materials. At the same time, it also has some disadvantages, such as, however, polyvinyl chloride has poor heat resistance, poor toughness, poor thermal stability, and difficult processing. The heat distortion temperature of ordinary PVC injection molding products is less than 55°C, the Vicat softening temperature is only about 75°C, and the notched impact strength at room temperature is less than 4KkJ / m 2 , which largely limits its application. [0003] Plastic composite materials are a new class of high-performance...

AI Technical Summary

Problems solved by technology

At the same time, it also has some disadvantages, such as, however, polyvinyl chloride has poor heat resistance, poor toughness, poor thermal stability, and difficult processing.

The heat distortion temperature of ordinary PVC injection molding products is less than 55°C, the Vicat softening temperature is only about 75°C, and the notched impact strength at room temperature is less than 4KkJ / m 2 , which largely limits its application

However, the existing heat-resistant modification technology mostly adopts the method of blending a large amount of heat-resistant modifiers, and the addition of heat-resistant modifiers will increase the cost; at the same time, due to the poor compatibility of heat-resistant modifiers with the system , will lead to a decrease in the processability and mechanical properties of the system

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