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Superfine kaoline filled PTFE composite material and preparation method thereof

A technology of ultra-fine kaolin and composite materials, which is applied in the field of ultra-fine kaolin filled PTFE composite materials and its preparation, can solve the problems of glass fiber damage to the dual surface, glass fiber is not alkali-resistant, ceramic powder has high hardness, etc., and can improve friction and wear. The effect of performance and mechanical properties, simple preparation process and low price

Inactive Publication Date: 2014-01-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Glass fiber, carbon fiber, graphite, molybdenum disulfide, hollow microspheres and various ceramic powders are currently the most commonly used fillers, but they all have shortcomings, such as glass fiber is not resistant to alkali and hydrofluoric acid, and is not resistant to water Grinding, glass fiber will damage the dual surface, molybdenum disulfide, graphite, bronze powder, and various ceramic powders are hard and easy to wear. Therefore, it is necessary to find a more suitable filling material to prepare PTFE with excellent performance and wider application composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] raw material:

[0030] PTFE (particle size 50μm), 85 parts by mass;

[0031] Kaolin (particle size 0.2μm), 15 parts by mass;

[0032] Al 2 o 3 (particle size 60nm), 0.05 parts by mass;

[0033] Perfluorooctanoic acid, 0.05 parts by mass;

[0034] method:

[0035] (1) Dissolve PFOA in water to make a solution with a mass concentration of 0.5%;

[0036] (2) Add polytetrafluoroethylene and superfine kaolin to the solution in step (1) in sequence, disperse with ultrasonic (250W, 26KHz) for 10 minutes, then add filler, stir evenly to obtain a mixture;

[0037] (3) Put the mixture into the mixer and stir it evenly at a high speed, and then cold press it under a strong pressure of 38Mpa (that is, press it at room temperature), and the cold pressing time is 5 minutes;

[0038] (4) The molded product obtained in step (3) is placed in a high-temperature sintering furnace, heated at a heating rate of 80°C / hour, and kept for 30 minutes when the temperature reaches 330°C;...

Embodiment 2

[0043] raw material:

[0044] PTFE (particle size 65μm), 85 parts by mass;

[0045] Kaolin (particle size 0.1 μm), 15 parts by mass;

[0046] graphite (30μm), 0.05 parts by mass;

[0047] Perfluorooctanoic acid, 0.05 parts by mass;

[0048] method:

[0049] (1) Dissolve PFOA in water to make a solution with a mass concentration of 0.5%;

[0050] (2) Add polytetrafluoroethylene and superfine kaolin to the solution in step (1) in sequence, disperse with ultrasonic (250W, 26KHz) for 10 minutes, then add filler, stir evenly to obtain a mixture;

[0051] (3) Put the mixture into the mixer and stir it evenly at high speed, then dry it at 110°C for 2 hours, and then cold press it under a strong pressure of 35Mpa (that is, press it at room temperature), and the cold pressing time is 8 minutes;

[0052] (4) Put the molding into a high-temperature sintering furnace and heat it at a heating rate of 80°C / hour. When the temperature reaches 290 o C for 30 minutes; then continue...

Embodiment 3

[0057] raw material:

[0058] PTFE (particle size 65μm), 90 parts by mass;

[0059] Kaolin (particle size 0.1 μm), 9 parts by mass;

[0060] MoS 2 (0.06μm), 1 part by mass;

[0061] Perfluorosulfonic acid, 0.05 parts by mass;

[0062] method:

[0063] (1) Dissolve PFOA in water to make a solution with a mass concentration of 0.5%;

[0064] (2) Add polytetrafluoroethylene and superfine kaolin to the solution in step (1) in sequence, disperse with ultrasonic (250W, 26KHz) for 10 minutes, then add filler, stir evenly to obtain a mixture;

[0065] (3) Put the mixture into the mixer and stir it evenly at high speed, then dry it at 100°C for 2 hours, and then cold press it under a strong pressure of 35Mpa (that is, press it at room temperature), and the cold pressing time is 5 minutes;

[0066] (4) Put the molding into a high-temperature sintering furnace, heat at a heating rate of 80°C / hour, and keep it warm for 30 minutes when the temperature reaches 290°C; then continue h...

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PUM

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Abstract

The invention provides a superfine kaoline filled PTFE composite material and a preparation method thereof. The composite material mainly comprises the following raw materials in parts by weight: 80 to 95 parts of teflon, 5 to 20 parts of superfine kaoline, 0.01 to 1 part of a filler, and 0.005 to 0.1 part of a surfactant. The superfine kaoline filled PTFE composite material provided by the invention has the advantages that as superfine kaoline is low in cost, wide in application range and soft, can be dispersed in suspended water, and has good plasticity, high cohesiveness and excellent electric insulation property, the composite material is simple in preparation technology, is economical and practical, and has high market competitiveness.

Description

technical field [0001] The invention relates to a superfine kaolin filled PTFE composite material and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) resin has the advantages of low friction coefficient, high and low temperature resistance, chemical corrosion resistance, aging resistance, high insulation, non-stick, etc., but due to its poor dimensional stability, poor thermal conductivity, large creep, low hardness, Especially under load, it is easy to wear, 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, on the basis of maintaining the original advantages of PTFE, fillers are added to PTFE, and the composite effect is used to improve the comprehensive performance of PTFE. Glass fiber, carbon fiber, graphite, molybdenum disulfide, hollow microspheres and various ceramic powders are currently the most commonly use...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08K3/34
Inventor 魏美英王菊华汪海风罗仲宽
Owner ZHEJIANG UNIV
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