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Preparing method of PTFE (polytetrafluoroethylene) composite material filled with nano particles

A technology of nanoparticles and composite materials, which is applied in the field of preparing high-performance nanoparticle-filled PTFE composite materials, which can solve the problems of lower than expected nanoparticle content, loss of nanoparticles, uneven mixing, etc., and achieve solvent recyclability and low pollution , the effect of high mechanical properties

Inactive Publication Date: 2012-07-25
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of mixing PTFE and nanoparticles, people often use dry mixing method, but in the dry mixing process, with the heat generated during stirring, the temperature rises, PTFE will agglomerate, making the mixing uneven, so people start again The jet mill is used to break the agglomeration and improve the uniformity of mixing, but the jet mill will lose and waste nanoparticles during use (Sawyer W, Freudenberg K, Bhimaraj P, Schadler L. “A study on the friction and wear behavior of PTFE filled with aluminum nanoparticles”, wear, 2003, 254: 573-580), resulting in the content of nanoparticles in the final composite material being lower than the expected value, failing to achieve the desired effect

Method used

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  • Preparing method of PTFE (polytetrafluoroethylene) composite material filled with nano particles
  • Preparing method of PTFE (polytetrafluoroethylene) composite material filled with nano particles

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Embodiment 1

[0027] Example 1: γ-glycidyl ether oxypropyltrimethoxysilane (KH560) modified Al 2 o 3 Fill the preparation method of PTFE composite material, carry out following steps successively:

[0028] 1) Weigh 0.4g of KH560 and dissolve it in 200ml of ethanol, stir for ten minutes, then add 10g of nano-Al 2 o 3 (60 nanometers), ultrasonically stirred at 25-35 ° C for 4 hours, filtered to recover the solvent (ie, ethanol), and the solid was dried at 100 ° C for 4 hours; modified nanoparticles --- modified nano-Al 2 o 3 .

[0029] 2) Weigh a certain amount of modified nano-Al 2 o 3 , added to 500 grams of PTFE, and stirred by hand for 10 minutes to form a pre-mixture (ie pre-mixed powder), wherein the modified nano-Al 2 o 3 The weight contents in the premix are 1%, 3%, 5%, 7% and 9%, respectively.

[0030] 3) Add 800 milliliters of ethanol to the premixture, stir ultrasonically for 40 minutes at a temperature of 25-30°C, filter and recover the ethanol, and dry (dry at 100°C for ...

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Abstract

The invention discloses a preparing method of a PTFE (polytetrafluoroethylene) composite material filled with nano particles. The method comprises the following steps of: (1) carrying out surface modification on nano particles by virtue of a coupling agent to obtain modified nano particles; (2) carrying out coarse mixing on PTFE and the modified nano particles to obtain premixing powder, wherein the weight content of the modified nano particles in the premixing powder is 0.1%-50%; (3) adding organic solvent in the premixing powder, carrying out ultrasonic agitation, filtering and drying to obtain PTFE composite powder with uniformly dispersed nano particles, wherein the weight ratio of the organic solvent to the premixing powder is 50-1000%; and (4) carrying out mould-pressing and sintering on the PTFE composite powder to obtain the PTFE composite material filled with nano particles. The PTFE composite material filled with nano particles, prepared by the method, has the characteristics of high mechanical property, high wear-resisting property, low frictional factor and the like.

Description

Technical field [0001] The invention relates to a method for preparing high-performance nanoparticle-filled PTFE composite materials, which are used to prepare PTFE engineering materials with high mechanical properties, high wear resistance and low friction coefficient, and are used in industrial fields such as mechanical bearing, friction and wear, sealing lubrication and so on. . Background technique [0002] Polytetrafluoroethylene (PTFE) resin has excellent high and low temperature resistance, corrosion resistance, aging resistance, high insulation, and non-stick properties. 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 fields of PTFE, it is necessary to modify its filling, that is, to use the advantages of filling p...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08K9/06C08K9/04C08K3/08C08K3/22C08K3/36C08K3/34C08K3/26B29B7/00B29C67/04B29C43/00
Inventor 汪海风杨辉徐意罗仲宽樊先平吴周安王树华
Owner ZHEJIANG UNIV
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