Polytetrafluoroethylene composite material and preparation method thereof

A polytetrafluoroethylene and composite material technology, applied in the field of load-bearing materials, can solve the problems of abrasive surface wear, increased material friction coefficient, lack of compatibility between metal particles and PTFE, etc., to achieve improved mechanical properties, low friction coefficient, high The effect of mechanical strength

Inactive Publication Date: 2013-02-13
株洲海天工程塑料实业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polytetrafluoroethylene composite material provided by this patent increases the dispersion and wear resistance to a certain extent, but the metal particles lack compatibility with PTFE, which is easy to separate, and will wear the grinding surface, making the material Increased coefficient of friction

Method used

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  • Polytetrafluoroethylene composite material and preparation method thereof
  • Polytetrafluoroethylene composite material and preparation method thereof
  • Polytetrafluoroethylene composite material and preparation method thereof

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preparation example Construction

[0043] The invention provides a kind of preparation method of polytetrafluoroethylene composite material, comprises the following steps:

[0044] a) Mix and dissolve the components described in the above technical solution in an organic solvent to obtain a mixed solution;

[0045] b) drying the mixed solution obtained in step a) to obtain a dry mixture;

[0046] c) Sintering the dry mixture obtained in the step b) under vacuum cold pressure to obtain a polytetrafluoroethylene composite material;

[0047] or

[0048] The dry mixture obtained in the step b) is vacuum hot-pressed to obtain a polytetrafluoroethylene composite material.

[0049] The invention provides a method for preparing a polytetrafluoroethylene composite material. First, the components described in the above technical solution are dissolved in an organic solvent to obtain a mixed solution. The present invention has no special limitation on the dissolution sequence of the components described in the above t...

Embodiment 1

[0073] Dissolve 93.99 g of polytetrafluoroethylene with a particle size of 1 μm in absolute ethanol, add 5 g of polyphenylparaben with a particle size of 5 μm, 0.5 g of expanded graphite with an expansion rate of 100 mL / g, and 0.5 g of basalt After the whisker fibers are dissolved, 0.01 g of a silane coupling agent is added dropwise thereto, and then the resulting mixed solution is placed in an ultrasonic vessel for ultrasonication, while stirring for 30 minutes until uniformly mixed. Put the homogeneously mixed material into a drying oven, heat and dry at 60°C for 48 hours; vacuumize the sintering furnace to make the vacuum degree reach 1.0×10 -3 Pa; After the dried material is cooled, it is molded under a pressure of 25MPa, and the pressure is kept for 5 minutes; after pressure relief, it is heated to 380°C for sintering and kept for 4 hours; stop heating, naturally cool to room temperature, and pressurize at 50MPa at the same time to obtain PTFE Vinyl composite.

[0074] T...

Embodiment 2

[0077] Dissolve 79.98 g of polytetrafluoroethylene with a particle size of 100 μm in absolute ethanol, add 16 g of polyphenylparaben with a particle size of 100 μm, 2 g of expanded graphite with an expansion rate of 400 mL / g, and 2 g of basalt whiskers After dissolving, 0.02 g of silane coupling agent was added dropwise thereto, and then the obtained mixed solution was put into an ultrasonic vessel for ultrasonication, and stirred for 30 minutes until uniformly mixed. Put the homogeneously mixed material into a drying oven and heat and dry it at 60°C for 48 hours; carry out vacuum treatment on the sintering furnace, and the vacuum degree is 1×10 -2 Pa; After the dried material is cooled, it is molded under a pressure of 25MPa, and the pressure is maintained for 5 minutes; after pressure relief, it is heated to 380°C for sintering and kept for 4 hours; stop heating, naturally cool to room temperature, and pressurize at 50MPa at the same time to obtain polytetrafluoroethylene co...

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Abstract

The invention provides a polytetrafluoroethylene composite material and a preparation method thereof. The polytetrafluoroethylene composite material comprises the following components in percentage by weight: 60 to 95 percent of polytetrafluoroethylene, 3 to 35 percent of poly-p-hydroxyphenyl benzoate, 0.1 to 10 percent of expanded graphite, 0.1 to 10 percent of crystal whiskers and 0.01 to 0.1 percent of coupling agent. According to the polytetrafluoroethylene composite material, the polytetrafluoroethylene is modified by using the poly-p-hydroxyphenyl benzoate under the action of the coupling agent, so that the tensile strength and abrasive resistance of the polytetrafluoroethylene are improved; the friction coefficient of the material is reduced by the addition of the expanded graphite; and the mechanical performance of the polytetrafluoroethylene composite material is improved by the addition of the crystal whiskers. Therefore, the polytetrafluoroethylene composite material is high in mechanical strength, tensile strength, ball-milling crack hardness and abrasive resistance and low in friction coefficient.

Description

technical field [0001] The invention relates to the technical field of load-bearing materials, in particular to a polytetrafluoroethylene composite material and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) has outstanding excellent comprehensive properties, high temperature resistance, corrosion resistance, non-stick, self-lubricating, excellent dielectric properties, low friction coefficient, it has been widely used as sealing materials and filling materials . However, pure PTFE has low hardness, poor wear resistance, low mechanical strength, large viscoelastic deformation and easy creep under the action of external force. These shortcomings limit the application of PTFE under heavy load conditions. [0003] In order to make up for the lack of mechanical properties of PTFE, fillers are used to modify it in the prior art, and various compression molding processes have been developed. There are currently four main methods for fo...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C08L27/18C08L67/00C08K7/24C08K7/10
Inventor赵兴仇伟建李宏
Owner株洲海天工程塑料实业股份有限公司