Preparation method of nickel phosphorus/expanded graphite-polyester resin/polytetrafluoroethylene composite material

Abstract

The invention provides a method for preparing a nickel phosphorus / expanded graphite-polyester resin / polytetrafluoroethylene composite material. The method comprises the following steps: firstly, preparing expanded graphite of which the surface is coated by a chemical nickel phosphorus cladding layer, secondly, filling a foamed nickel support with the expanded graphite, preparing an unsaturated polyester resin / polytetrafluoroethylene mixed solution, sufficiently filling pores of foamed nickel filled with the expanded graphite with the unsaturated polyester resin / polytetrafluoroethylene mixed solution, and finally conducting room-temperature polymerization and later polishing and grinding, so as to obtain the nickel phosphorus / expanded graphite-polyester resin / polytetrafluoroethylene composite material. In the preparation process of the nickel phosphorus / expanded graphite-polyester resin / polytetrafluoroethylene composite material, sufficient contact of the polyester resin and the expanded graphite of which the surface is coated by the nickel phosphorus cladding layer with polytetrafluoroethylene is ensured, so aggregation of the polytetrafluoroethylene and the expanded graphite is effectively avoided, furthermore, the wearing resistance of the polytetrafluoroethylene is greatly improved, the prepared composite material is small in friction coefficient, high in hardness, high in pressure resistance and good in wearing resistance, and has wide application prospects under high-frequency friction working conditions.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and relates to a preparation method of nickel phosphorus / expanded graphite-polyester resin / polytetrafluoroethylene composite material suitable for high-frequency friction working conditions. Background technique [0002] Industries such as engineering manufacturing, automobiles, chemicals, and aerospace have higher and higher requirements for equipment friction and wear performance. Improving the wear resistance and anti-friction performance of mechanical equipment and its parts has become an important guarantee for promoting intelligent manufacturing and industrial mass production. In industrial production and spacecraft operation, sometimes the equipment is in service under high-frequency friction conditions, and its excellent wear resistance and anti-friction performance have become an important measure for its long-term and stable operation. Therefore, under the conditi...

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Problems solved by technology

Patent CN103897304A mentions first amination of graphene and carboxylation of nano-polytetrafluoroethylene, and then a condensation reaction between the amino group on the modified graphene and the carboxyl group on the modified polytetrafluoroethylene to prepare a graphene-nano Polytetrafluoroethylene composite filler, the composite filler obtained by using this technology can be uniformly dispersed in the polymer matrix, which not only improves the friction performance of the polymer, but also enhances its mechanical and thermodynamic properties; but the patented technology has high preparation costs , the defect that the preparation process is complicated

Patent CN201610055057.0A mentions that nano-graphene is aminated first, polytetrafluoroethylene powder is treated with plasma and then acrylic acid is grafted, and then nano-α-manganese dioxide-graphene composite material is prepared by hydrothermal synthesis technology. Finally, the α-manganese dioxide-graphene-polytetrafluoroethylene wear-resistant and anti-friction composite material is obtained. The composite material has the advantages of small friction coefficient, low wear rate, and high thermal stability, but its wear resistance still cannot meet high Frequent friction conditions

Therefore, the application performance of PTFE and its composite materials under high-frequency friction conditions needs to be improved urgently