Heat-conducting friction-resistant polyformaldehyde composite material and preparation method thereof

Abstract

The invention belongs to the field of polymer composite materials, and relates to a heat-conducting friction-resistant polyformaldehyde composite material and a preparation method thereof. The composite material comprises the following raw materials in parts by weight: 100 parts of polyformaldehyde resin, 0.1-1 part of an antioxidant, 5-20 parts of polytetrafluoroethylene, 5-10 parts of polyurethane elastomer, 5-30 parts of wollastonite, 5-50 parts of copper powder, 0.1-2 parts of a coupling agent and 0.5-3 parts of a lubricant. The treated wollastonite and copper powder are mixed with polyformaldehyde, polytetrafluoroethylene, polyurethane, the antioxidant and the lubricant through a two-roll mixing mill, and then the mixture is subjected to tabletting in a flat vulcanizing machine to obtain the friction-resistant polyformaldehyde composite material. The composite material prepared by the method disclosed by the invention has the characteristics of low friction factor and good mechanical properties, and can be applied to preparation of wear-resistant parts including bearings, gears and the like.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and in particular relates to a friction-resistant polyoxymethylene composite material and a preparation method thereof. Background technique [0002] Polyoxymethylene (POM) is an engineering plastic with excellent comprehensive properties, with a high degree of crystallinity (generally up to 70% to 85%), a glass transition temperature Tg of -30°C, a melting point of 182°C, and a density of 1.4 to 1.6g / cm 3 , is one of the resin varieties in plastics whose specific strength and specific stiffness are close to metal. POM has high strength and rigidity, good dimensional stability, excellent corrosion resistance, wear resistance, self-lubrication and creep resistance, no noise, fatigue resistance, convenient processing and molding, cheap and easy-to-get raw materials, and is widely used in the fields of machinery and electronics. In recent years, with the improvement of the use environm...

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Problems solved by technology

In order to further improve the friction performance of POM, many researchers at home and abroad blend POM with other polymers (such as polytetrafluoroethylene, polyurethane) or use fibers (such as CF, GF, aramid fibers, whiskers) and inorganic nano Particles (graphite, molybdenum disulfide and nano-copper, calcium carbonate, alumina) etc. have made composite reinforcement and toughening modification of POM, and achieved certain results, but there are certain limitations. The tribological and mechanical properties of polyoxymethylene still needs to be further improved

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