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Method for preparing nickel phosphorus/expanded graphite-polyester resin/polytetrafluoroethylene composite material

A polytetrafluoroethylene and expanded graphite technology is applied in the field of preparation of nickel phosphorus/expanded graphite-polyester resin/polytetrafluoroethylene composite materials, which can solve the problem that the wear resistance cannot meet the requirements of high frequency friction conditions and the friction coefficient The wear rate is low, thermal stability, and application performance needs to be improved urgently, so as to achieve the effect of small friction coefficient, high compressive strength and high hardness

Active Publication Date: 2019-08-30
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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preparation example Construction

[0033] The invention provides a method for preparing a nickel-phosphorus / expanded graphite-polyester resin / polytetrafluoroethylene composite material. First, the expanded graphite whose surface is coated with an electroless nickel-phosphorus coating is prepared, and then the expanded graphite is filled into a foamed nickel support. Then prepare unsaturated polyester resin / polytetrafluoroethylene mixed solution, and fully impregnate the foamed nickel pores filled with expanded graphite into unsaturated polyester resin / polytetrafluoroethylene mixed solution, and finally undergo room temperature polymerization and subsequent polishing to prepare nickel Phosphorus / expanded graphite-polyester resin / polytetrafluoroethylene wear-resistant and friction-reducing composite material, which specifically includes the following steps:

[0034] S1. Coating chemical nickel-phosphorus coating on the surface of expanded graphite:

[0035] S11, chemically sensitizing and activating the expanded ...

Embodiment 1

[0060] S1. Coating chemical nickel-phosphorus coating on the surface of expanded graphite:

[0061] S11. First prepare a chemical sensitization solution and a chemical activation solution, and perform chemical sensitization and activation treatment on the expanded graphite in turn, and clean it up:

[0062] a. Water washing of expanded graphite: Add 3.5g of worm-like expanded graphite with an average length of 4mm and an average diameter of 1mm into a beaker filled with 200mL deionized water, then boil the deionized water in the beaker for 30min , the solution in the beaker was naturally cooled to room temperature, the expanded graphite was collected by filtration, and the collected expanded graphite was washed with deionized water at room temperature for 3 times, and then dried at 60°C;

[0063] b. The chemical sensitization process of expanded graphite is as follows: put 1.7g of dried expanded graphite in 200mL chemical sensitization solution, first magnetically stir the sol...

Embodiment 2

[0101] S1. Coating chemical nickel-phosphorus coating on the surface of expanded graphite:

[0102] S11. First prepare a chemical sensitization solution and a chemical activation solution, and perform chemical sensitization and activation treatment on the expanded graphite in turn, and clean it up:

[0103] a. Washing of expanded graphite: Add 4g of worm-like expanded graphite with an average length of 4mm and an average diameter of 1mm into a beaker filled with 200mL deionized water, then boil the deionized water in the beaker for 35min. Cool the solution in the beaker to room temperature naturally, filter and collect the expanded graphite, wash the collected expanded graphite with deionized water at room temperature for 3 times, and then dry it at 60°C;

[0104] b. The chemical sensitization process of expanded graphite is as follows: put 2g of dried expanded graphite in 200mL chemical sensitization solution, first magnetically stir the solution at room temperature for 25min...

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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...

Claims

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Application Information

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IPC IPC(8): C08L67/06C08L27/18C08K9/12C08K9/10C08K3/08C08K7/24
CPCC08L67/06C08L27/18C08K9/12C08K9/10C08K3/08C08K7/24
Inventor 宋来洲郁长天杨育林王秀丽梁丽芬李飞李希达
Owner YANSHAN UNIV
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