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High-load-bearing low-friction polytetrafluoroethylene friction material and its manufacturing process

A polytetrafluoroethylene, low friction coefficient technology, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of increased friction coefficient of materials, easy separation, and wear of abrasive surfaces, and achieves increased mechanical strength, friction coefficient, etc. reduced effect

Inactive Publication Date: 2011-12-14
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent is prepared by mixing PTFE powder and polyacrylonitrile powder, and adding metals and metal oxides, etc., which increases the dispersion and wear resistance of PTFE to a certain extent, but the lack of compatibility between metal particles and PTFE is easy Separation will occur, and it will wear the grinding surface, increasing the friction coefficient of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Dissolve 93.99% polytetrafluoroethylene with absolute ethanol, dissolve 5% polyphenylparaben, 0.5% expanded graphite, and 0.5% basalt fiber in the solution, and add 0.01% silane coupling dropwise Put the agent into the ultrasonic container, and stir for 30 minutes at the same time until the mixture is uniform. Put the uniformly mixed materials into a drying oven and heat and dry at 60°C for 48 hours; vacuumize the sintering furnace with a vacuum degree of 1.0-10×10 -3 Pa; After the dried material is cooled, it is molded under a pressure of 25 MPa, and the pressure is kept for 5 minutes; the pressure is released, heated to 380°C for sintering, and kept for 4 hours; the heating is stopped, naturally cooled to room temperature, and the pressure is 50 MPa at the same time, and the preparation is obtained. s material.

Embodiment 2

[0022] Example 2: Dissolve 79.98% polytetrafluoroethylene with absolute ethanol, dissolve 16% polyphenylparaben, 2% expanded graphite, and 2% basalt fiber in the solution, and add 0.02% silane coupling dropwise Put the agent into the ultrasonic container, and stir for 30 minutes at the same time until the mixture is uniform. Put the uniformly mixed materials into a drying oven and heat and dry at 60°C for 48 hours; vacuumize the sintering furnace with a vacuum degree of 1.0-10×10 -3 Pa; After the dried material is cooled, it is molded under a pressure of 25 MPa, and the pressure is kept for 5 minutes; the pressure is released, heated to 380°C for sintering, and kept for 4 hours; the heating is stopped, naturally cooled to room temperature, and the pressure is 50 MPa at the same time, and the preparation is obtained. s material.

Embodiment 3

[0023] Example 3: Dissolve 79.97% polytetrafluoroethylene with absolute ethanol, dissolve 14% polyphenylparaben, 3% expanded graphite, and 3% basalt fiber in the solution, and add 0.03% silane coupling dropwise Put the agent into the ultrasonic container, and stir for 30 minutes at the same time until the mixture is uniform. Put the uniformly mixed materials into a drying oven and heat and dry at 60°C for 48 hours; vacuumize the sintering furnace with a vacuum degree of 1.0-10×10 -3 Pa; After the dried material is cooled, it is molded under a pressure of 25 MPa, and the pressure is kept for 5 minutes; the pressure is released, heated to 380°C for sintering, and kept for 4 hours; the heating is stopped, naturally cooled to room temperature, and the pressure is 50 MPa at the same time, and the preparation is obtained. s material.

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Abstract

The invention which relates to a PTFE friction material with high bearing and a low friction coefficient and a manufacturing process thereof belongs to the field of materials with high bearing and low friction coefficients and manufacturing processes thereof. The PTFE friction material which mainly comprises components of PTFE, poly-p-hydroxybenzoate, expanded graphite, a basalt fiber, a silane or titanate coupling agent and the like is manufactured by adopting a mixing technology of ultrasonic vibration-swirling and the manufacturing process of vacuum cold press sintering or vacuum hot pressing molding. The mechanical strength of the PTFE composite material is obviously increased, the friction coefficient of the PTFE composite material is reduced, and the PTFE composite material which has obvious progresses in aspects of tensile strength, ball indentation hardness, wear resistance and the like allows application demands of harsh industrial fields and transport fields of railway freight car bogies, slide slewing bearings and the like to be satisfied. The PTFE friction material of the invention has the advantages of low friction coefficient, and good bearing performance and corrosion resistance, and the manufacturing process of the PTFE friction material has the advantages of simplicity, low cost, and wide practicality.

Description

technical field [0001] The invention relates to a material with high load and low friction coefficient and its manufacturing process, in particular to a polytetrafluoroethylene friction material with high load and low friction coefficient and its manufacturing process. Background technique [0002] Polytetrafluoroethylene (PTFE) has outstanding excellent comprehensive properties, high temperature resistance, corrosion resistance, non-stick, self-lubricating, excellent dielectric properties, and low coefficient of friction. 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. In order to make up for the lack of mechanical properties of PTFE, it is modified with fillers and its molding process is improved. There are currently four main methods for molding PTFE materials: high-temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C09K3/14C08L67/04C08K13/04C08K7/24C08K3/04C08K7/10C08K5/54C08K5/10B29C67/04
Inventor 王世博张纱葛世荣张德坤
Owner CHINA UNIV OF MINING & TECH
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