Preparation method of wear-resistant heat-conducting irradiation-crosslinking ultra-high molecular weight polyethylene

Abstract

The invention discloses a preparation method of wear-resistant heat-conducting irradiation-crosslinking ultra-high molecular weight polyethylene. The preparation method comprises the following steps: adding ultra-high molecular weight polyethylene granules with the molecular weight of 2 million or so into 8 wt% of heat-conducting filler, boron nitride, 0.5 wt% of wear-resistant filler, carbon nanotubes, 1 wt% of crosslinking accelerator and 0.1 wt% of antioxidant to form a mixture; sufficiently mixing the mixture, sending the mixture into an extruder, melting by heating, and extruding by an extruder, wherein in the heating process, the temperature and pressure of the raw materials are controlled, and the thickness of the extruded material is kept at 1-10mm; and irradiating the obtained sample by gamma-rays of a cobalt source in air with the irradiation dose of 50-180 kGy, and putting the irradiation sample into a drying oven under vacuum conditions. On the premise of keeping the inherent properties of the ultra-high molecular weight polyethylene material stable, the method further enhances the wear resistance, heat-conducting property, temperature resistance and mechanical strength of the ultra-high molecular weight polyethylene material.

Description

technical field [0001] The invention relates to the technical field of engineering plastic materials, in particular to a preparation method of wear-resistant and heat-conductive irradiation cross-linked ultra-high molecular weight polyethylene. Background technique [0002] According to the division method of Philips Petroleum Company of the United States, polyethylene with a molecular weight of more than 1.5 million is called "UHMWPE", that is, Ultra-high molecular weight PE, and it is called ultra-high molecular weight polyethylene in Chinese. Hoechst of Germany, Hercules of the United States and Mitsui Petrochemical Company of Japan are the three major companies producing UHMWPE in the world. The main manufacturers in China are Beijing Auxiliary No. 2 Plant, Shanghai Takahashi Petrochemical The company's chemical plant, Sinopec Qilu Petrochemical Branch. [0003] The extremely high molecular weight of UHMWPE (the molecular weight of HDPE is usually only 20,000-300,000) e...

AI Technical Summary

Problems solved by technology

However, due to its ultra-long linear molecular structure, there is still a certain gap between its heat resistance, hardness, abrasive wear resistance and fatigue wear resistance compared with other engineering plastics, especially in the injection molding process, UHMWPE is too thermally conductive Poor results in changes in its shape after demoulding, which seriously affects the quality of the product and the efficiency of production

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