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Preparation method of teflon composite material

A technology of polytetrafluoroethylene and composite materials, applied in the field of preparing PTFE composite materials, can solve the problems of difficult to mix evenly with fillers, loss of filler particles, restricting the performance of PTFE composite materials, etc.

Inactive Publication Date: 2012-10-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the filler can significantly improve the performance of PTFE, it is difficult to mix evenly with the filler because PTFE is easy to agglomerate during the mixing process, which restricts the improvement of the performance of PTFE composites
At present, people often adopt dry mixing method and solvent method to prepare PTFE composite materials, but the dry mixing method is not only difficult to mix the materials evenly, but also has disadvantages such as large dust and loss of filler particles, while the solvent method can promote the uniform mixing of materials, but it will use To organic solvents, there are disadvantages such as environmental pollution, flammability and explosion, and harm to human health.

Method used

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  • Preparation method of teflon composite material
  • Preparation method of teflon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1, a kind of method for preparing polytetrafluoroethylene composite material, carry out following steps successively:

[0041] 1) Add 1KG deionized water and 2 grams of sodium lauryl sulfate to a 2L glass beaker at room temperature (about 15~25°C), stir (speed 800 rpm) for 5 minutes, then add 495 grams of PTFE (particle size 50 μm), continue to stir for 10 minutes, add 5 grams of nano-Al modified by silane coupling agent KH560 2 o 3 (particle size of 50 nm), stop stirring after 15 minutes.

[0042] The above-mentioned nano-Al modified by silane coupling agent KH560 2 o 3 The preparation method is as follows:

[0043] Add 50 ml of absolute ethanol, 10 g of nano-alumina (particle size: 50 nm), and 0.4 g of silane coupling agent KH560 to a 200 ml single-necked bottle, and stir at 25°C for 1 hour, then centrifuge to remove absolute ethanol and solid Wash with deionized water three times, each time with 50 ml of deionized water, and then dry at 120 °C for 6 h...

Embodiment 2

[0050] Embodiment 2, a kind of method for preparing polytetrafluoroethylene composite material, carry out following steps successively:

[0051] 1) Add 1KG deionized water and 200mg ammonium perfluorooctanoate to a 2L glass beaker at room temperature (about 15~25°C), stir for 5 minutes, add 495g PTFE (particle size: 50 μm), and continue stirring for 10 minutes. Add 5 grams of nano-Al modified by silane coupling agent KH560 2 o 3 (50 nm), stirring was stopped after 15 minutes.

[0052] The above-mentioned nano-Al modified by silane coupling agent KH560 2 o 3 The preparation method is with embodiment 1.

[0053] 2), with embodiment 1.

[0054] The tensile properties and friction and wear properties of the composite material are tested according to the national standard HGT 2902-1997 and GB-T3960-1983 respectively, in which:

[0055] Tensile strength: 30.48 MPa,

[0056] Elongation at break: 428%,

[0057] Consumption: 50.7 mg,

[0058] Friction coefficient: 0.18.

Embodiment 3

[0059] Embodiment 3, a kind of method for preparing polytetrafluoroethylene composite material, carry out following steps successively:

[0060] 1) Add 1KG deionized water and 2 grams of non-ionic surfactant L44 (a copolymer of ethylene glycol and propylene glycol, with an average molecular weight of 2200, purchased from Nantong) into a 2L glass beaker at room temperature Xinbaoyuan Chemical Co., Ltd.), after stirring for 5 minutes, add 495 grams of PTFE (particle size is 50 μm), continue stirring for 10 minutes, add 5 grams of nano-Al modified by silane coupling agent KH560 2 o 3 (50 nm) and stop stirring after 15 min.

[0061] The above-mentioned nano-Al modified by silane coupling agent KH560 2 o 3 The preparation method is with embodiment 1.

[0062] 2), with embodiment 1.

[0063] The tensile properties and friction and wear properties of the composite material are tested according to the national standard HGT 2902-1997 and GB-T3960-1983 respectively, in which:

[0...

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Abstract

The invention discloses a preparation method of a teflon composite material, comprising the following steps: 1) successively adding teflon and filling materials in the water which contains surfactant, and uniformly stirring, wherein the weight ratio of the surfactant to water is 0.0002-0.1:1, the weight ratio of water to the sum of teflon and filling materials is 0.5-2:1, and the weight of teflon accounts for 84-99% of that of the sum of teflon and filling materials; and 2) filtering the product obtained by the step 1), washing, drying, conducting mold pressing and sintering the solids obtained by filtering to obtain the teflon composite material. The method is simple and green, and the teflon composite material prepared by the method has excellent performance.

Description

technical field [0001] The invention relates to a method for preparing PTFE composite material. Background technique [0002] Polytetrafluoroethylene (PTFE) resin has excellent properties such as high and low temperature resistance, corrosion resistance, aging resistance, high insulation, and non-stickiness. However, due to its poor dimensional stability, poor thermal conductivity, large creep, and low hardness, especially in It is easy to wear under load, which limits its application in the fields of mechanical bearing, friction and wear, and seal lubrication. Therefore, in order to expand the application field of PTFE, it is necessary to modify its filling, that is, to use the advantages of high hardness, wear resistance, dimensional stability, and good thermal conductivity of the filler to improve the defects of PTFE. Commonly used fillers include glass fiber, carbon fiber, bronze powder, graphite, carbon black, various ceramic powders, and some micron fillers such as hi...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08K7/14C08K7/06C08K3/04C08K3/30C08K3/08C08K3/22C08K3/36C08K3/34C08K3/26C08K9/04C08K9/06
Inventor 汪海风罗仲宽杨辉徐意张诚德
Owner ZHEJIANG UNIV
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