Preparation method of ultra-high molecular weight polyethylene injection molding composite material crosslinked by light irradiation

Abstract

The invention relates to a method for preparing a light-irradiated crosslinked ultrahigh molecular weight polyethylene injection molded composite material, comprising the following steps: firstly compounding a low molecular weight polyolefin material and a photo-crosslinking agent, and then compounding the composite low molecular weight polyolefin and ultrahigh molecular weight polyethylene to prepare a photocrosslinked ultrahigh molecular weight polyethylene injection molded composite material; and combining the ultraviolet radiation technology in the injection moulding stage to realize the preparation of a photocrosslinked ultrahigh molecular weight polyethylene injection molded product. According to the invneiton, the photo-crosslinking technology is applied to injection moulding of ultrahigh molecular weight polyethylene for the first time to prepare the ultrahigh molecular weight polyethylene photocrosslinked product. By the method, wear resistance of the injection molded productis significantly improved; and the preparation method is simple, has characteristics of low cost, mild reaction conditions and wide application range, and has a good development prospect.

Description

technical field [0001] The invention belongs to the field of material compounding, and in particular relates to a preparation method of light irradiation crosslinked ultra-high molecular weight polyethylene injection molding composite material. Background technique [0002] Ultra-high molecular weight polyethylene (UHMW-PE) is a thermoplastic engineering plastic with a linear structure and excellent comprehensive properties. The world's first industrialization was realized in 1957 by Allied Chemical Company of the United States, and then Hoechst Company of Germany, Hercules Company of the United States, Mitsui Petrochemical Company of Japan, etc. were also put into industrial production. my country was the first to successfully develop and put into industrial production in 1964. Limited to the conditions at that time, the molecular weight of the product was about 1.5 million. With the advancement of technology, the current molecular weight of the product can reach more than...

AI Technical Summary

Problems solved by technology

[0009] So far, the use of flow modifiers is the most commonly used in the realization of UHMWPE injection molding technical solutions, but the addition of low molecular weight polyethylene will reduce wear resistance and mechanical properties, so further modification is required

At present, the most direct method for wear-resistant modification and mechanical property modification of polyethylene system is cross-linking treatment, including chemical cross-linking, silane cross-linking, radiation cross-linking, etc., due to chemical cross-linking, silane cross-linking The association will greatly increase the viscosity of the melt. In addition, when the injection molding of the UHMWPE injection molding compound itself is extremely difficult, chemical cross-linking and silane cross-linking cannot be realized.

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