Method for preparing high-flow high-heat-resistance transparent polyvinyl chloride alloy capable of injection molding

Abstract

The invention discloses a method for preparing high-flow high-heat-resistance transparent polyvinyl chloride alloy capable of injection molding. The method comprises the following steps of: adding 100 weight parts of polyvinyl chloride and 1-3 weight parts of heat stabilizers into a high-speed mixer for mixing; sequentially adding 1-3 weight parts of acrylate processing aids, 1-3 parts of internal lubricants, 0.3-1 weight part of external lubricant, 4-100 weight parts of flow modifiers, 4-100 weight parts of heat-resistant anti-reflection modifiers and 1-50 weight parts of impact modifiers; taking out the mixed material, cooling, and adding the cooled material into a cone-shaped twin-screw extruder; melting and extruding under the condition that the temperature of a first area is 130-170 DEG C, the temperature of a second area is 140-180 DEG C, the temperature of a third area is 150-185 DEG C and the temperature of a fourth area is 140-180 DEG C; and granulating. In the preparation method of the alloy, the polyvinyl chloride, the processing aid and the modifiers are mechanochemically treated by adopting a new process, thereby the effective adsorption of the processing aid is enhanced, the compatibility of the modifiers and the polyvinyl chloride is improved, and the alloy product has the advantages of good transparency, good flowability, high heat resistance, high strength, and the like.

Description

technical field [0001] The invention relates to a preparation method of a transparent polyvinyl chloride alloy with high fluidity and high heat resistance which can be injection molded. Background technique [0002] Polyvinyl chloride is one of the commonly used general-purpose plastics. It has the advantages of flame retardancy, high chemical resistance, good mechanical strength and electrical insulation, low price, and wide application fields. PVC also has some disadvantages, such as poor fluidity, poor heat resistance, poor thermal stability, difficult processing, etc., which limit its use. [0003] Plastic alloys are a class of new materials with high performance, functionalization and specialization obtained by physical blending or chemical grafting. Plastic alloys can improve or enhance the performance of existing plastics and reduce costs, and are widely used in automobiles, electronics, precision instruments, office equipment, packaging materials, building materials...

AI Technical Summary

Problems solved by technology

The Chinese patent CN1651505A published on August 10, 2005 discloses a heat-resistant and smoke-suppressing polyvinyl chloride composition and its preparation method, which uses multi-component composite technology to improve the defects of polyvinyl chloride's insufficient heat resistance and toughness

It can also be seen from the existing research that while improving the heat resistance and mechanical properties of PVC, the existing PVC modifiers are often difficult to take into account the fluidity of PVC, and even make processing more difficult

In addition, the addition of existing polyvinyl chloride processing aids and modifiers often leads to poor transparency of products, which limits the application of rigid polyvinyl chloride in transparent occasions

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