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Wear-resistant low-creep polytetrafluoroethylene sealing material as well as preparation method and application thereof

A polytetrafluoroethylene and sealing material technology, applied in the low creep polytetrafluoroethylene sealing material and its preparation, in the field of wear resistance, can solve the problems of inability to use in the food industry, creep deformation leakage, wear failure, etc. Good wear reduction, low creep and long service life

Active Publication Date: 2013-12-11
GUANGZHOU MECHANICAL ENG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Most of the PTFE materials with good creep resistance and high wear resistance in the above patents cannot be used in the food industry due to the fillers added, and cannot pass the requirements of U.S.FDA CFR21177.1210 food container sealing rings and gaskets
Abrasion failure, creep deformation and leakage are the main causes of failure of food-grade PTFE seals

Method used

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  • Wear-resistant low-creep polytetrafluoroethylene sealing material as well as preparation method and application thereof
  • Wear-resistant low-creep polytetrafluoroethylene sealing material as well as preparation method and application thereof
  • Wear-resistant low-creep polytetrafluoroethylene sealing material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step (1): Suspend 90% polytetrafluoroethylene resin (particle size 25 μm, Daikin Fluorine Chemicals China Co., Ltd., model M-18F), 0.5% titanium chrome yellow (particle size 20 μm), 8% sulfuric acid Barium (particle size: 30 μm), 1% titanium dioxide (particle size: 30 μm), 0.5% silicon dioxide (particle size: 40 μm) bake in an oven at 100°C for 3 hours, cool to room temperature, and mix in a mixer (low speed, 200 rpm, hold time 30 seconds, then high speed, 2000 rpm, hold time 60 seconds, finally low speed, 200 rpm, hold time 30 seconds), to obtain the mixture;

[0037] Step (2): cold molding the mixture obtained in step (1), the molding pressure is 20Mpa, and the holding time is 1 minute;

[0038] Step (3): Put the product formed in step (2) into the sintering box, heat up to 330°C at a rate of 5°C / hour, keep it warm for 1 hour, and then continue to heat up to 370°C at a rate of 10°C / hour, keep it warm 1 hour; then cool down to 330°C at a rate of 10°C / hour, hold for 3 ho...

Embodiment 2

[0040] Step (1): Suspend 30% polytetrafluoroethylene resin (40 μm particle size, Daikin Fluorochemical China Co., Ltd., model M-18), 20% titanium chrome yellow (60 μm particle size), 30% sulfuric acid Barium (particle size is 30 μm), 10% titanium dioxide (particle size is 40 μm), 10% silicon dioxide (particle size is 40 μm) in an oven at 120 ° C for 2 hours, cooled to room temperature, put into a mixer and mix (low speed, 200 rpm, hold time 30 seconds, then high speed, 2000 rpm, hold time 60 seconds, finally low speed, 200 rpm, hold time 30 seconds), to obtain the mixture;

[0041] Step (2): cold molding the mixture obtained in step (1), the molding pressure is 60Mpa, and the holding time is 10 minutes;

[0042] Step (3): Put the product formed in step (2) into the sintering box, heat up to 330°C at a rate of 60°C / hour, keep it warm for 1 hour, then continue to heat up to 370°C at a rate of 50°C / hour, and keep it warm 1 hour, then cool down to 330°C at a rate of 30°C / hour, ke...

Embodiment 3

[0044] Step (1): Suspend 70% polytetrafluoroethylene resin (particle size 70 μm, Zhonghao Chenguang Chemical Research Institute, model CGM-16), 5% titanium chrome yellow (particle size 60 μm), 20% barium sulfate (particle size is 30μm), 3% titanium dioxide (particle size is 40μm), 2% silicon dioxide (particle size is 40μm) in the oven at 150 ℃ for 1 hour, after cooling to room temperature, put it into the mixer and mix ( Low speed, 200 rev / min, hold time 30 seconds, then high speed, 2000 rev / min, hold time 60 seconds, finally low speed, 200 rev / min, hold time 30 seconds), obtain mixture;

[0045] Step (2): Cold molding the mixture obtained in step (1), the molding pressure is 40Mpa, and the holding time is 5 minutes;

[0046] Step (3): Put the product formed in step (2) into the sintering box, raise the temperature to 330°C at a rate of 30°C / hour, keep it warm for 2 hours, then continue to heat up to 370°C at a rate of 30°C / hour, and keep it warm 3 hours, then cool down to 33...

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Abstract

The invention discloses a wear-resistant low-creep polytetrafluoroethylene sealing material as well as a preparation method and application thereof. The sealing material comprises the following components by mass percent: 30-90% of polytetrafluoroethylene resin, 0.5-50% of chrome antimony titanium buff rutile, 0.5-60% of barium sulfate, 0.5-60% of silicon dioxide, 0.5-60% of titanium dioxide and 0-30% of polymers. The preparation method comprises the steps of drying various components, mixing the components uniformly in a high-speed mixer according to the proportion, carrying out cold compression molding and sintering, insulating and cooling, thus obtaining the wear-resistant low-creep polytetrafluoroethylene sealing material. The wear-resistant low-creep polytetrafluoroethylene sealing material disclosed by the invention is resistant to wear, has low creep and long service life and can be applied to various industrial fields such as national defence, transportation, chemical industry, machinery, textiles, food and the like besides the advanced science and technology.

Description

technical field [0001] The invention belongs to the field of sealing materials, and in particular relates to a wear-resistant and low-creep polytetrafluoroethylene sealing material and a preparation method and application thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) is widely used in aerospace and other fields due to its excellent chemical resistance, high and low temperature resistance, and low friction. In the national industry, PTFE material is the standard sealing material and is often used as a seal for various equipment. PTFE can be used in almost all media conditions and has a wide range of operating temperatures. Pure PTFE has disadvantages such as poor wear resistance and poor creep resistance. These defects can be modified by adding suitable fillers to make it a PTFE sealing material with excellent performance. Commonly used fillers include various inorganic fillers such as metals, metal oxides, glass fibers, carbon fibers, carbon powder,...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08L79/08C08L61/16C08K3/00C08K3/30C08K3/36C08K3/22B29C67/04B29C43/02
Inventor 叶素娟谭锋向宇邓联勇李国一
Owner GUANGZHOU MECHANICAL ENG RES INST
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