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High-temperature resistant and low-creep polytetrafluoroethylene composite material and preparation method thereof

A polytetrafluoroethylene and composite material technology, which is applied in the field of polytetrafluoroethylene composite materials and their preparation, can solve the problems of low interface bonding strength, poor affinity, and reduce the performance of composite materials, so as to improve mechanical properties and creep resistance. The effect of denaturation, improvement of tensile strength, and improvement of interfacial bonding ability

Active Publication Date: 2012-09-26
ZHEJIANG SONGHUA NEW MATERIAL CO LTD
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  • Abstract
  • Description
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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 bond strength and reduced composite performance

Method used

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  • High-temperature resistant and low-creep polytetrafluoroethylene composite material and preparation method thereof
  • High-temperature resistant and low-creep polytetrafluoroethylene composite material and preparation method thereof

Examples

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Embodiment 1

[0021] 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

[0023] A preparation method of a polytetrafluoroethylene composite material with high temperature resistance and low creep, the method comprises the following steps:

[0024] (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 ;

[0025] (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;

[0026] (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; Then cool down from 38...

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Abstract

The invention relates to a polytetrafluoroethylene composite material and a preparation method thereof. In the preparation method for the high-temperature resistant and low-creep polytetrafluoroethylene composite material, the composite material consists of polytetrafluoroethylene and carbon fibers, wherein the carbon fibers are subjected to surface coating by a pyrophosphate type titanate coupling agent, and are oxidized at the high temperature of between 350 and 450 DEG C for 5 to 20 minutes. The invention also discloses the polytetrafluoroethylene composite material prepared by the method.By the combined treatment process, the interface bonding capacity between inorganic fibers and polytetrafluoroethylene resin is improved greatly, and the mechanical performance and creep resistance of the material are improved.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene composite material 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 low-cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/18C08K9/04C08K7/06C08K3/04
Inventor 杨根源杨成刚
Owner ZHEJIANG SONGHUA NEW MATERIAL CO LTD
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