Abrasion-proof self-lubricating composite material and its preparation method

Abstract

The invention relates to an abrasion resistant self-lubricating composite material and a preparation method thereof. The raw materials in weight percentage of the material are: 1 to 15 percent of nano-porous silicon dioxide and 85 to 99 percent of suspended PTFE resin moulding powder. The material can be widely applied to the fields of lubricating, sealing and so on, is made into various parts such as bushes, sealing rings, guiding rings and so on, and is suitable for the working occasions at ultralow temperature and ultrahigh temperature, such as oil forbidden self-lubricating abrasion resistant parts of ultralow temperature refrigerating machines, liquid fuel pumps, high pressure pumps, oxygen generating devices, high temperature driers, conveyor belts inside furnaces, medicines and foods and so on, and dynamic seals of liquid or gas of an engine.

Description

technical field [0001] The invention relates to a wear-resistant self-lubricating composite material and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) has excellent heat resistance, corrosion resistance and dielectric properties, especially its unique non-adhesive and self-lubricating properties, so that it is not only used in the chemical and electrical industries but also in the mechanical and electronic industries. broad attention. However, pure PTFE has the obvious disadvantages of poor wear resistance and poor creep resistance, which greatly limits its application range and effect. Modified PTFE is usually filled with micron-sized inorganic particles. However, the micron-sized particle-filled modified PTFE material still has certain limitations, such as increased friction coefficient and significantly reduced toughness, and hardness, creep resistance and wear resistance are closely related to the content of inorganic substa...

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Problems solved by technology

[0004] Chinese invention patent CN 1176153C discloses a polytetrafluoroethylene wear-resistant composite material containing carbon nanotubes, Chinese invention patent CN 1844228A discloses a preparation method of a rare earth modified carbon nanotube / polytetrafluoroethylene composite material, China Invention patent CN 1775846A discloses a polytetrafluoroethylene wear-resistant composite material containing transition metal disulfide nanotubes, and Chinese invention patent CN 1699464A discloses a nano-Si 3 N 4 / Preparation method of polytetrafluoroethylene wear-resistant composite material, but filler carbon nanotubes, rare earth modified carbon nanotubes, transition metal disulfide nanotubes and nano Si 3 N 4 Both have the disadvantages of complicated preparation process, high price, and unstable performance, so they are not suitable for application and mass production

[0005] Chinese invention patent CN 1221646C discloses a nano-material modified polytetrafluoroethylene oil seal composition and its preparation method, but ordinary nano-inorganic particles are used to improve the hardness, creep resistance and wear resistance of the material Limited, its main use is oil seal compound composition

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