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Method for preparing ultrafine zeolite powder filling PTFE (polytetrafluoroethylene) composite material

A technology of composite materials and zeolite powder, which is applied in the field of preparation of polytetrafluoroethylene composite materials, can solve the problems of large surface wear of abrasive parts, high hardness of ceramic powder, complex preparation process, etc., and achieve strong market competitiveness and good adsorption , The effect of low friction coefficient

Inactive Publication Date: 2013-09-11
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, 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 wear-resistant in water. Glass fiber will damage the dual surface, carbon fiber is not resistant to oxidants, the preparation process is complicated, graphite is not resistant to oxidants, molybdenum disulfide is not resistant to strong acids, various ceramic powders have high hardness, and they have great wear on the surface of abrasive parts, etc. (Zhang Yongming, Li Hong, Zhang Heng, Fluorinated Functional Materials, Beijing: Chemical Industry Press, 2008:60-70), therefore, it is necessary to find more suitable filler materials to prepare PTFE composite materials with better performance and wider application fields

Method used

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  • Method for preparing ultrafine zeolite powder filling PTFE (polytetrafluoroethylene) composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1, a kind of preparation method of ultrafine zeolite powder filling PTFE composite material, carry out following steps successively:

[0037] 1) Ingredients:

[0038] PTFE (particle size 50μm), 85%,

[0039] Heffield zeolite powder (particle size 0.2μm), 12%,

[0040] Al 2 o 3 (particle size 60nm), 3%,

[0041] 2) Put the mixture prepared in step 1) into a stirrer and stir at a high speed (3500r.p.m) evenly, and then cold press it under 38Mpa strong pressure (that is, press it at room temperature), and the cold pressing time is 3 minute.

[0042] 3) Put the molded product obtained in step 2) 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 330°C; then continue to heat at a heating rate of 60°C / hour to 370°C ℃, keep warm for 0.5 hours.

[0043] 4) Cool the sintered product obtained in step 3) to 320°C at a rate of 60°C / hour ℃ for 24 minutes, and then natur...

Embodiment 2

[0045] Embodiment 2, a kind of preparation method of ultrafine zeolite powder filling PTFE composite material, carry out following steps successively:

[0046] 1) Ingredients:

[0047] PTFE (particle size 50μm), 87%,

[0048] Heffield zeolite powder (particle size 0.1μm), 10%,

[0049] Graphite (30μm), 3%,

[0050] 2) Put the mixture prepared in step 1) into the mixer and stir evenly at high speed (3500r.p.m), and then cold press it under 35Mpa strong pressure (that is, press it at room temperature), and the cold pressing time is 3 minute.

[0051] 3) Put the molded product obtained in step 2) into a high-temperature sintering furnace, heat at a heating rate of 30°C / hour, and keep it warm for 30 minutes when the temperature reaches 290°C; then continue heating at a heating rate of 60°C / hour to 375 ℃, keep warm for 0.6 hours.

[0052] 4) Cool the sintered product obtained in step 3) to 290°C at a rate of 60°C / hour and keep it warm for 30 minutes, then naturally cool to room ...

Embodiment 3

[0054] Embodiment 3, a kind of preparation method of ultrafine zeolite powder filling PTFE composite material, carry out following steps successively:

[0055] 1) Ingredients:

[0056] PTFE (particle size 50μm), 90%,

[0057] Mordenite powder (particle size 0.1μm), 9%,

[0058] MoS 2 (particle size 20 nm), 1%,

[0059] 2) Put the mixture prepared in step 1) into the mixer and stir evenly at high speed (3500r.p.m), and then cold press it under 35Mpa strong pressure (that is, press it at room temperature), and the cold pressing time is 5 minute.

[0060] 3) Put the molded product obtained in step 2) into a high-temperature sintering furnace, heat at a heating rate of 60°C / hour, and keep it warm for 0.5 hours when the temperature reaches 285°C; then continue to heat at a heating rate of 60°C / hour to 370 ℃, keep warm for 0.5 hours.

[0061] 4) Cool the sintered product obtained in step 3) to 285°C at a rate of 60°C / hour and keep it warm for 30 minutes, then naturally co...

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Abstract

The invention discloses a method for preparing an ultrafine zeolite powder filling PTFE (polytetrafluoroethylene) composite material. The method comprises the steps of 1) proportioning materials, i.e. mixing polytetrafluoroethylene, ultrafine zeolite powder, a filler I and a filler II according to the ratio; 2) uniformly mixing the mixture proportioned and then carrying out cold press forming under the pressure of 20-40 Mpa; 3) putting the formed object obtained in the step 2) into a high temperature sintering furnace, heating to 330-380 DEG C with the speed of 30-100 DEG C / hour and preserving heat for 0.5-2 hours; and 4) naturally cooling sintering products obtained in the step 3) to the room temperature to obtain the ultrafine zeolite powder filling PTFE (polytetrafluoroethylene) composite material. The ultrafine zeolite powder filling PTFE (polytetrafluoroethylene) composite material prepared according to the method has excellent performance, the wear resistance of the composite material is improved upon the premise of not remarkably reducing the matrix friction coefficient of PTFE, and the application range of the composite material is wide.

Description

technical field [0001] The invention belongs to the technical field of polymer material modification, and in particular relates to a preparation method of a polytetrafluoroethylene composite material. Background technique [0002] Polytetrafluoroethylene (PTFE) resin has excellent chemical stability, aging resistance, radiation resistance, thermal stability, etc., but it also has some disadvantages, such as poor mechanical properties and load-bearing capacity, large linear expansion coefficient, and poor thermal conductivity. , poor creep resistance, poor wear resistance, high production costs, etc., these shortcomings limit its application. In order to improve the comprehensive performance of PTFE, people have been working on the modification of PTFE for many years. Filling modification is to add fillers to PTFE. On the basis of maintaining the original advantages of PTFE, the composite effect is used to improve the comprehensive performance of PTFE. Glass fiber, carbon f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08K7/26C08K7/14C08K3/34C08K3/30C08K3/22C08K3/04
Inventor 魏美英汪海风徐意罗仲宽杨辉
Owner ZHEJIANG UNIV
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