A high-temperature-resistant and low-creep polytetrafluoroethylene composite sealing ring and its preparation method

A technology of polytetrafluoroethylene and composite materials, which is applied in the direction of engine seals, mechanical equipment, engine components, etc., can solve problems such as poor affinity, low interface bonding strength, and reduced performance of composite sealing rings

Active Publication Date: 2011-12-14
ZHEJIANG SONGHUA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, due to the fact that the surface of CF (carbon fiber) has many pores, grooves, impurities and crystals, and the content of polar groups such as hydroxyl groups and carbonyl groups is relatively small, these make Poor affinity between CF (carbon fiber) and TFE matrix, resulting in low interfacial bonding strength, reducing the performance of composite seal rings

Method used

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  • A high-temperature-resistant and low-creep polytetrafluoroethylene composite sealing ring and its preparation method
  • A high-temperature-resistant and low-creep polytetrafluoroethylene composite sealing ring and its preparation method
  • A high-temperature-resistant and low-creep polytetrafluoroethylene composite sealing ring and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The specific operation of the carbon fiber surface coating air oxidation treatment process is: first dilute the NDZ-201 (pyrophosphate titanate) coupling agent with alcohol to prepare a solution, and the weight percentage concentration of the pyrophosphate titanate coupling agent is 10%, put in carbon fiber, stir for 30 minutes, put in a drying oven at 80°C for 4 hours, and then activate at 105±3°C for 2 hours. Oxidize the surface-coated carbon fibers at a high temperature of 400° C. for 10 minutes to obtain modified carbon fibers.

Embodiment 2

[0037] Such as image 3 A preparation method of a polytetrafluoroethylene composite seal ring with high temperature resistance and low creep shown, the method comprises the following steps:

[0038] (1) Mixing material: add the carbon fiber modified in Example 1 into a high-speed mixer, then add PTFE, the weight ratio of carbon fiber: PTFE is 1:3; stir for 10-15 min, and pass the mixed material through a 60-mesh sieve ;

[0039] (3) Compression molding: put an appropriate amount of mixture in the sealing ring mold, hold the pressure for 10 minutes on a hydraulic press at a pressure of 20-40 MPa, and release the gas twice during the boosting process to obtain a modified seal with a thickness of 2-3 mm. Non-toxic PTFE sealing ring blank;

[0040] (4) High-temperature sintering: put the billet in a special sintering furnace for PTFE materials, raise the temperature to 330 °C at a rate of 100 °C / h, and keep it for 1.5 h; then slowly heat it to 375 °C at a rate of 37 °C / h for 3 h...

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Abstract

The invention relates to a polytetrafluoroethylene (PTFE) composite material sealing ring with high temperature resistance and low creep, and a preparation method thereof. The PTFE and carbon fiber are subjected to pressure forming, high temperature sintering and heat treatment to prepare the composite material sealing ring. The carbon fiber is prepared through the following steps that: a pyrophosphoric acid-type titanic acid ester coupling agent is adopted for carrying out a surface coating treatment for the carbon fiber; then the treated carbon fiber is subjected to an oxidation treatment for 5-20 minutes at a temperature of 350-450 DEG C. According to the present invention, the interfacial combining capacity between the inorganic fiber and the PTFE resin is substantially improved, the mechanical property and the creep resistance of the modified sealing material are increased.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene composite sealing ring and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) has become an indispensable and important material in the fields of chemistry, machinery and aerospace due to its excellent high and low temperature performance and chemical stability. It was put into industrial application in foreign countries in the 1980s as a sealing material. Since the 1990s, some enterprises have gradually produced pure PTFE sealing materials. [0003] With the further expansion of the application range, the traditional pure PTFE sealing materials have been difficult to meet the market requirements due to their shortcomings such as low strength, poor creep resistance and wear resistance, so various modified PTFE sealing materials have been developed accordingly pregnancy. Among them, the use of filler-modified PTFE to prepare high-strength, wear-resistant, and lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08K9/04C08K7/06C08K3/04F16J15/00B29C69/00B29C43/58B29C67/04B29C71/02
Inventor 杨根源杨成刚
Owner ZHEJIANG SONGHUA NEW MATERIAL CO LTD
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