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Potassium hexatitanate whisker reinforced PTFE composite material

A potassium hexatitanate whisker and polytetrafluoroethylene technology, which is applied in the field of potassium hexatitanate whisker-reinforced polytetrafluoroethylene composite materials, can solve problems such as hindering the uniform dispersion of PTFE, and achieve increased interfacial force and compatibility performance, improve overall performance, and increase the use temperature

Inactive Publication Date: 2003-03-12
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific surface area of ​​PTW is 4 to 6 times that of glass fiber, and the number of PTW per gram is dozens or even hundreds of times that of glass fiber, so PTW has serious agglomeration and bridging behavior, which hinders its uniform dispersion in PTFE

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1 Take 95wt% PTFE and 5wt% PTW treated with γ-aminopropyl triethoxysilane (the amount of coupling agent is 0.7wt% of the weight of the potassium hexatitanate whisker) and mix them with a high-speed mixer, and then mix them in Cold pressing at 30MPa and sintering at 375°C to obtain a composite material. The standard sample made of this material is subjected to a point-surface contact friction and wear test on the Optimol SRV high-temperature friction and wear testing machine. Rub for 30 minutes to test its wear quality and wear scar area.

Embodiment 2

[0018] Example 2 Mix 90wt% PTFE with 10wt% PTW treated with gamma-(methacryloyloxy)propyltrimethoxysilane (the amount of coupling agent is 0.5wt% of the weight of the potassium hexatitanate whisker) , and then cold-pressed at 50MPa and sintered at 380°C to obtain a composite material.

[0019] Comparative Example 2-1 Pure PTFE was cold-pressed at 25MPa and sintered at 375°C to obtain the material.

Embodiment 3

[0023] Embodiment 3 takes 86wt% PTFE and 14wt% with silane coupling agent 1 (gamma-aminopropyltriethoxysilane), silane coupling agent 2 (gamma-(2,3-epoxypropoxy) propyl Trimethoxysilane), silane coupling agent 3 (γ-(ethylenediamino) propyltrimethoxysilane) treated PTW mixed (the amount of coupling agent is 1.5wt% of the weight of potassium hexatitanate whisker) , and then cold-pressed at 70MPa and sintered at 385°C to obtain a composite material.

[0024] In Comparative Example 3, 86wt% PTFE was mixed with 14wt% PTW without surface treatment, and the composite material was obtained through the same process as in Example 3.

[0025] The Vicat softening point, notched impact strength, tensile strength, and elongation at break of the composite material obtained in Example 3 are all higher than those in Comparative Example 3, and the comparison results are shown in Table 3.

[0026]

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Abstract

A teflon composite material reinforced by the crystal whisker of potassium hexatitanate, which has 0.5-2 microns of diameter and whose surface has been treated by silane or titanate coupling agent, is disclosed. Its advantages are high impact strength, high temp for thermal deformation, high elongation for break, high tension strength and high antiwear nature.

Description

technical field [0001] The present invention relates to a kind of potassium hexatitanate whisker (K 2 O·6TiO 2 , Potassium Titanate Whiskers, referred to as PTW) modified polytetrafluoroethylene (PTFE) composite material, the material is a wear-resistant, heat-resistant deformation, alkali-resistant, both reinforced and toughened PTFE composite material. Background technique [0002] PTFE has very excellent chemical stability, extremely small coefficient of friction, and a wide range of operating temperatures. It has the reputation of "King of Plastics". However, PTFE has its fatal weakness—severe creep under load and low heat distortion temperature; at the same time, its poor wear resistance and poor dimensional stability also greatly limit its wide application. In order to make up for these deficiencies, fillers must be added. Commonly used inorganic fillers include glass fiber, carbon fiber, molybdenum disulfide, bronze powder and graphite. [0003] At present, glass ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18
Inventor 冯新陈东辉陆小华王昌松孙盛华
Owner NANJING UNIV OF TECH
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