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Wear-resisting modified polyimide composite and preparation method thereof

A polyimide and composite material technology, applied in the field of polymer materials and their preparation, can solve the problem that composite materials cannot achieve friction coefficient, wear rate and mechanical properties, composite material friction coefficient and wear rate are low, PTFE radiation resistance ability Low problems, to achieve the effect of good mechanical strength, low cost, good heat resistance

Active Publication Date: 2015-11-18
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low radiation resistance of PTFE, poor mechanical properties, large coefficient of linear expansion and wear, its use as a friction part alone is limited.
[0005] Wear-resistant modified polyimide composites have been reported in relevant literature and patents, but the reported composites cannot achieve friction coefficient, wear rate and mechanical properties. The balance between performance
For example, U.S. Patents US5179153 and US5700863 reported that graphite, LCP and PTFE were used to modify thermosetting PI for wear resistance, and the friction coefficient and wear rate of the composite material were low, but the mechanical properties were poor.
U.S. Patent US4816516 discloses the use of lead oxide, molybdenum disulfide, graphite, boron nitride, fluororesin, etc. to modify PI for wear resistance. The friction coefficient of the composite material in the patent is low, but the wear rate is high

Method used

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  • Wear-resisting modified polyimide composite and preparation method thereof
  • Wear-resisting modified polyimide composite and preparation method thereof
  • Wear-resisting modified polyimide composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Phenolphthalein polyimide (Ⅰ-3), polytetrafluoroethylene (trade name is 1600N) powders were dried at 150°C for 3 hours in a forced air drying oven.

[0054] (2) Place the dried phenolphthalein polyimide (I-3) and polytetrafluoroethylene powder, antioxidant 1010, antioxidant 168, lubricant PETS-3 and UV-531 at room temperature at high speed Mix in the mixer for 3 minutes, and mix in 3 times to obtain polyimide / polytetrafluoroethylene composite powder; wherein the mass fraction of phenolphthalein type polyimide (I-3) is 88.4%, and the mass fraction of polytetrafluoroethylene powder The fraction is 10%, the mass fraction of antioxidant 1010 is 0.5%, the mass fraction of antioxidant 168 is 0.5%, the mass fraction of lubricant PETS-3 is 0.3%, and the mass fraction of UV-531 is 0.3%. The uniformly mixed materials were put into the hopper of the twin-screw extruder, melted and blended, extruded and granulated to obtain a wear-resistant modified polyimide composite materi...

Embodiment 2

[0058] The preparation process is the same as in Example 1, except that the mass fraction of phenolphthalein polyimide (I-3) is 83.4%, the mass fraction of polytetrafluoroethylene powder is 15%, and the antioxidant 1010 mass fraction is 0.5%. The mass fraction of antioxidant 168 is 0.5%, the mass fraction of lubricant PETS-3 is 0.3%, and the mass fraction of UV-531 is 0.3%, which are mixed in 4 times.

Embodiment 3

[0060] The preparation process is the same as in Example 1, except that the mass fraction of phenolphthalein polyimide (I-3) is 78.4%, the mass fraction of polytetrafluoroethylene powder is 20%, and the antioxidant 1010 mass fraction is 0.5%. The mass fraction of antioxidant 168 is 0.5%, the mass fraction of lubricant PETS-3 is 0.3%, and the mass fraction of UV-531 is 0.3%, and the mixture is divided into 5 times.

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Abstract

The invention discloses wear-resisting modified polyimide composite. The modified polyimide composite comprises raw materials in percentage by mass as follows: 78%-89% of phenolphthalein type polyimide, 10%-20% of polytetrafluoroethylene, 0.01%-1% of an antioxidant and 0.01%-1% of other aids, wherein the structure formula of phenolphthalein type polyimide is shown in the formula (I), n is a positive integer, and Ar is an aromatic group with the carbon number ranging from 6 to 30. According to the wear-resisting modified polyimide composite provided by the invention, phenolphthalein type polyimide with a special structure is taken as a raw material, and polytetrafluoroethylene is used for modifying phenolphthalein type polyimide, so that the prepared composite has a smaller friction coefficient and wear rate and also has better mechanical strength and excellent heat resistance.

Description

technical field [0001] The invention relates to the technical field of polymer materials and their preparation, in particular to a wear-resistant modified polyimide composite material and a preparation method thereof. Background technique [0002] With the rapid development of cutting-edge technology, the requirements for wear-resistant and anti-friction materials are getting higher and higher. It is difficult for general engineering polymers to meet the design requirements of friction parts working in high temperature, high speed, high vacuum and high radiation environments. [0003] Polyimide (PI) is a heterocyclic polymer characterized by imide ring structure, which has outstanding thermal stability, mechanical properties, radiation resistance and solvent resistance. The phenolphthalein-type polyimide uses phenolphthalein monomer, dinitro or bishalogenated imide monomer as raw materials, and synthesizes phenolphthalein-type polyimide through aromatic nucleophilic substitu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08L27/18C08K5/134C08K5/526C08K5/132
CPCC08L79/08C08L2201/08C08L27/18C08K5/1345C08K5/526C08K5/132
Inventor 龙昱王树华付铁柱陈振华周晓勇周强王玮陈国飞方省众
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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