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Method for improving wear resistance of PTFE

A technology of wear resistance and PTFE, which is applied in the production field of polytetrafluoroethylene, can solve problems such as increased molecular weight, lowered melting point, and differences in processing technology, and achieves the effect of simple process, simple method, and low friction coefficient

Inactive Publication Date: 2014-03-12
嘉善申嘉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Using 100% XPTFE can produce films, rods or other materials with high wear resistance, but due to the high cost of the radiation crosslinking process, the cost of the end product is also high, which is only possible in some very special fields get applied
In addition, because the melting point of XPTFE is lowered and the molecular weight is increased, the processing technology is also different from conventional PTFE materials.

Method used

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  • Method for improving wear resistance of PTFE

Examples

Experimental program
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Effect test

Embodiment 1

[0014] A kind of method that this embodiment provides to improve PTFE wear resistance, 450 grams of suspended PTFE raw materials (molecular weight more than 8,000,000) and 50 grams of cross-linked PTFE are fully mixed in a mixing machine to prepare a modified material containing 10% cross-linked PTFE PTFE. Take 100 grams of the sample and press it into a disc with a diameter of 5 cm in a mold. In addition, 100 grams of suspended PTFE raw materials were pressed into discs with a diameter of 5 cm under the same conditions as control sample 1. The PTFE disc is subjected to a friction test on a MMW-1A friction and wear testing machine, the test temperature is room temperature, the pressure is 100 Newton, and the time is 60 minutes. After the test, the wear rate of the test is calculated by accurately weighing the mass of the PTFE disc. The friction coefficient of the PTFE sample is 0.22, and the mass wear is 0.32 grams; the friction coefficient of the control PTFE sample under t...

Embodiment 2

[0020] A method for improving the wear resistance of PTFE described in this example is to fully mix 250 grams of suspended PTFE raw materials (more than 8 million molecular weight) with 250 grams of XPTFE (cross-linked PTFE) in a mixing machine, and the selected XPTFE has a melting point of 314 ° C. High wear-resistant XPTFE, thus preparing modified PTFE containing 50% cross-linked PTFE. Take 100 grams of the sample and press it into a disc with a diameter of 5 cm in a mold. The PTFE disc is subjected to a friction test on a MMW-1A friction and wear testing machine, the test temperature is room temperature, the pressure is 100 Newton, and the time is 60 minutes. After the test, the wear rate of the test is calculated by accurately weighing the mass of the PTFE disc. The coefficient of friction of the PTFE sample is 0.248, and the mass wear is 0.075 grams; Therefore, after adding 50% cross-linked PTFE, the friction coefficient increases by about 20%, and the wear decreases by...

Embodiment 3

[0022] A kind of method for improving the wear resistance of PTFE described in this embodiment, 200 grams of suspended PTFE raw materials (more than 8 million molecular weight) and 300 grams of cross-linked PTFE are fully mixed in a mixing machine to prepare modified modified PTFE containing 60% cross-linked PTFE PTFE. Take 100 grams of the sample and press it into a disc with a diameter of 5 cm in a mold. The PTFE disc is subjected to a friction test on a MMW-1A friction and wear testing machine, the test temperature is room temperature, the pressure is 100 Newton, and the time is 60 minutes. After the test, the wear rate of the test is calculated by accurately weighing the mass of the PTFE disc. The coefficient of friction of this PTFE sample is 0.248, and the mass wear is zero. Therefore, after adding 60% cross-linked PTFE, the friction coefficient increases by about 20%, and the wear decreases by 100%. This shows that the 60% cross-linked PTFE added to the test piece ha...

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Abstract

The invention discloses a method for improving the wear resistance of PTFE. XPTFE and conventional PTFE are used as raw materials. The method is characterized in that XPTFE and conventional PTFE are fully mixed through mechanical blending, the content of XPTFE is 5% to 60%, and the content of conventional PTFE is 40% to 95%. XPTFE is crosslinked PTFE powder with an average particle size of less than 30 microns and with high wear resistance. According to the invention, XPTFE and conventional PTFE are blend, the advantages of the two materials are combined together, so modified PTFE with a low friction coefficient and high wear resistance is prepared; since XPTFE and conventional PTFE have good compatibility, almost no influence is posed to processing technology. The method is simple and practical and introduces no chemical components other than PTFE; process is simple, and modified PTFE materials with different wear resistance can be prepared by adjusting the ratio of XPTFE to conventional PTFE.

Description

technical field [0001] The invention relates to a production technology of polytetrafluoroethylene (PTFE), in particular to a method for improving the wear resistance of PTFE. Background technique [0002] Polytetrafluoroethylene (PTFE) has excellent thermal stability, chemical stability, high lubricity, electrical insulation, and can be used for a long time in the temperature range of minus 180°C to 250°C. PTFE products have played a pivotal role in many fields such as chemical industry, machinery, electronics, electrical appliances, military industry, and environmental protection. At present, my country has become the world's largest producer of PTFE. The product forms of pure PTFE include films, sheets, rods and other profiles. Although PTFE has the lowest coefficient of friction among all polymer materials, the biggest disadvantage of PTFE is its low friction and wear resistance. In order to improve the wear resistance of PTFE materials, graphite, glass fiber, carbon ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18
Inventor 吴国忠钟磊胡志强
Owner 嘉善申嘉科技有限公司
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