High-wearing polytetrafluoroethylene composite material and preparing method thereof

A technology of polytetrafluoroethylene and composite materials, which is applied in the field of polytetrafluoroethylene composite materials and its preparation, can solve the problems of limited wear resistance of polytetrafluoroethylene materials, complex processing processes, and unfavorable product molding, etc., to achieve The effect of low production equipment requirements, high storage modulus, and low production cost

Inactive Publication Date: 2007-07-04
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this polyacrylonitrile-based carbon fiber braid has a limited effect on improving the wear resistance of PTFE materials, and its wear resistance can only be significantly improved by adding metal elements.
Moreover, due to the complex processing process of polyacrylonitrile-based carbon fiber, its braid and polytetrafluoroethylene are not conducive to product molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 40% (weight percent) polyacrylonitrile powder (particle size 30 μm) and 60% polytetrafluoroethylene powder (particle size 50 μm) into a high-speed stirrer and stir for 10 minutes to make them evenly mixed. Then press the mixture at 40MPa pressure and room temperature, then put the pressed molded part into the sintering furnace, heat it to 150°C at a heating rate of 100°C / hour in an air environment, and then heat it at a heating rate of 50°C / hour Heat to 270°C, hold for 30 minutes, then heat to 315°C at a heating rate of 40°C / hour, hold for 30 minutes, then heat to 375°C±5°C at a heating rate of 30°C / hour, and hold for 2 hours. In the cooling process, the temperature is first lowered to 315°C at a cooling rate of 50°C / hour, kept at a temperature of 30 minutes, and then naturally cooled to room temperature to obtain a finished product. This embodiment is suitable for materials of various shapes with a thickness of less than 1 cm.

Embodiment 2

[0024] Polyacrylonitrile powder (particle size 50 μm) was heated to 370° C. in the air environment and kept for 2 hours. Put 30% (weight percent) heat-treated polyacrylonitrile powder and 70% polytetrafluoroethylene powder (particle size 80 μm) into a high-speed stirrer and stir for 10 minutes to make them evenly mixed. Then press the mixture under 40MPa pressure and room temperature, then put the pressed molded part into the sintering furnace, heat it to 375°C±5°C at a heating rate of 40°C / hour in the air environment, and keep it warm for 2 hours; then cool it down naturally To room temperature, the finished product is obtained. This example is suitable for products of various sizes.

Embodiment 3

[0026] The polyacrylonitrile powder (particle size 80 μm) was heated to 370° C. for 2 hours in the air environment. Put 50% (weight percent) heat-treated polyacrylonitrile powder and 50% polytetrafluoroethylene powder (particle size 120 μm) into a high-speed stirrer and stir for 10 minutes to make them evenly mixed. Then press the mixture under 40MPa pressure and 200°C, then put the pressed molded part into the sintering furnace, heat it to 315°C at a heating rate of 50°C / hour in the air environment, keep it for 30 minutes, and then heat it at 30°C / hour The heating rate is heated to 375 ° C ± 5 ° C, and kept for 2 hours. In the cooling process, the temperature is first lowered to 315°C at a cooling rate of 50°C / hour, kept at a temperature of 30 minutes, and then naturally cooled to room temperature to obtain a finished product. This example is suitable for products of various sizes.

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Abstract

The invention relates to polytetrafluoroethylene composite material and the method for preparing the same, belonging to polymer material modification field. Said polytetrafluoroethylene composite material with strong wear- resistant property is prepared through following steps: mixing polytetrafluoroethylene with polyacrylonitrile powder, pressing and shaping, and sintering at high temperature. The granule rate of said polytetrafluoroethylene powder is 30- 200 um, and the content is 50- 70%; the granule rate of polyacrylonitrile powder is 30- 100 um, and content is 30- 50%. The metal, metal oxidant, non-metal oxidant, carbide and other fiber packing material can be selectively filled into the component, which can dramatically increase the wear- resistant performance by over 100 times, heat- resistant performance and high temperature mechanical properties. The composite material is suited to be used to prepare wear- resistant, high temperature resistant, chemical product resistant, low- friction coefficient sealing ring, valve, pipeline and pump. The method is characterized by simple process and low production cost.

Description

technical field [0001] The invention belongs to the technical field of polymer material modification, and specifically relates to a polytetrafluoroethylene composite material and a preparation method. Background technique: [0002] PTFE has been widely used in many fields because of its excellent chemical stability, high temperature resistance and low friction coefficient, but its poor wear resistance and high cost restrict its application range. my country's "Polymer Materials Science and Engineering" (1999, Volume 15, No. 1, Pages 68 to 72) once introduced the friction and wear properties of modified polytetrafluoroethylene filled with metals. Adding metal fillers can improve the wear performance of polytetrafluoroethylene by 1-2 orders of magnitude, but due to the lack of compatibility with polytetrafluoroethylene, it is easy to produce phase separation, and these metal particles will cause wear on the grinding surface, making the material The coefficient of friction inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08K3/22C08L33/20
Inventor 黄文浩宋明斌
Owner UNIV OF SCI & TECH OF CHINA
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