Polytetrafluoroethylene modified filler, modified polytetrafluoroethylene composite material, preparation method and application

A polytetrafluoroethylene and composite material technology, applied in the field of modified polytetrafluoroethylene composite materials and preparation, polytetrafluoroethylene modified filler, can solve the interface difference, friction coefficient and wear rate can not be reduced at the same time, filler and The problem of matrix interface has not been effectively solved, etc.

Pending Publication Date: 2022-04-26
北京石墨烯技术研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing filling modified fillers are divided into two categories, (1) traditional fillers: bronze powder, carbon fiber, glass fiber, graphite, etc., there is a problem that the modification effect is compromised, and the friction coefficient and wear rate cannot be reduced at the same time, often Improving the performance of the other at the cost of losing one performance, the mechanical properties of PTFE will generally decrease after filling modification
Moreover, the interface between the filler and the PTFE matrix is ​​generally poor, which affects the mechanical properties; (2) new nanofillers: graphene, nano-Al 2 o 3 , nano-SiO 2 etc. Nano-fillers generally have the problems of uneven dispersion and easy agglomeration, and the dispersion process is generally simple mechanical mixing, so that the advantages of nano-fillers cannot be fully utilized, and the interface between fillers and substrates has not been effectively resolved. The modification effect is similar to that of traditional There is no absolute advantage over fillers

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  • Polytetrafluoroethylene modified filler, modified polytetrafluoroethylene composite material, preparation method and application
  • Polytetrafluoroethylene modified filler, modified polytetrafluoroethylene composite material, preparation method and application
  • Polytetrafluoroethylene modified filler, modified polytetrafluoroethylene composite material, preparation method and application

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preparation example Construction

[0044] In some embodiments, the preparation method of the polytetrafluoroethylene modified filler includes: mixing organic fibers, graphene oxide nanosheets, dopamine hydrochloride, Tris-HCl buffer solution and a solvent. The solvent can be water and / or conventional organic solvents such as methanol, ethanol, acetone, and the like.

[0045] In some embodiments, the preparation method of polytetrafluoroethylene modified filler includes:

[0046]S1, mixing graphene oxide nanosheets, dopamine hydrochloride, Tris-HCl buffer solution and solvent, heating and reacting to obtain a solution containing polydopamine-graphene oxide nanosheets;

[0047] S2, immersing the organic fibers in a solution containing polydopamine-graphene oxide nanosheets.

[0048] The solvent in the preparation method is the same as the above-mentioned solvents, and can be water and / or conventional organic solvents, such as methanol, ethanol, acetone, and the like.

[0049] In some preferred embodiments, the ...

Embodiment 1～5 and comparative example 1～7

[0087] Prepare the modified polytetrafluoroethylene composite material according to the ratio of raw materials shown in Table 1, and the specific preparation method is as follows:

[0088] (1) Chopped polyimide fibers with a fiber density of 2.2dtex and a fiber length of 1 to 3 mm were ultrasonically cleaned with acetone and ethanol for 15 to 20 minutes, and then dried.

[0089] (2) A certain amount of graphene oxide nanosheets (with a sheet diameter of 1 μm to 50 μm) was placed in deionized water and stirred and mixed to prepare a graphene oxide nanosheet solution with a concentration of 10 mg / mL.

[0090] (3) Soak the treated polyimide fibers in the graphene oxide nanosheet solution, and stir for 20 minutes with magnetic force to mix.

[0091] (4) Take an appropriate amount of the mixed impregnating liquid of step (3), add dopamine hydrochloride to the mixed impregnating liquid, add Tris-HCl solution (trishydroxymethylaminomethane hydrochloride, commercially available, conce...

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Abstract

The invention relates to the technical field of sealing materials, in particular to a polytetrafluoroethylene modified filler, a modified polytetrafluoroethylene composite material, a preparation method and application. The polytetrafluoroethylene modified filler comprises polydopamine, reduced graphene nanosheets and organic fibers, the filler has a three-dimensional network skeleton structure, the organic fibers are used as a skeleton, and the reduced graphene nanosheets are attached to the surfaces of the organic fibers in a physical adsorption manner. The polydopamine is combined with the reduced graphene nanosheet in a chemical bonding manner; wherein the organic fibers are polyimide or polyether-ether-ketone, and are chopped fibers.

Description

technical field [0001] The invention relates to the technical field of sealing materials, in particular to a polytetrafluoroethylene modified filler, a modified polytetrafluoroethylene composite material, a preparation method and an application. Background technique [0002] As a special engineering plastic, polytetrafluoroethylene (PTFE) is widely used in many fields. It has good acid and alkali resistance, solvent resistance, high and low temperature resistance, and weather resistance. Most importantly, compared with other materials, PTFE has a low coefficient of friction and is an excellent self-lubricating material that can be used as a good sealing material. However, PTFE has poor wear resistance, is easy to wear, and has a short service life, which greatly restricts its wider application. At present, there are three main methods of tribological modification of PTFE in the scientific and engineering circles: filling modification, blending modification, and surface modi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/12C08K9/04C08K3/04C08L27/18C08L79/08C08L61/16
CPCC08K9/12C08K9/08C08K3/042C08L27/18C08L79/08C08L61/16C08K2201/011C08L2205/16
Inventor 朱巧思郭建强李炯利王旭东王刚罗圭纳
Owner 北京石墨烯技术研究院有限公司
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