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High-filling-capacity polytetrafluoroethylene composite film and preparation method thereof

A polytetrafluoroethylene and composite film technology, which is applied in the field of high-filling polytetrafluoroethylene composite film and its preparation, can solve the problem of weakening the structural uniformity and mechanical properties of the PTFE composite film, and cannot realize the high-filling PTFE composite film and resin. Due to the low degree of particle infiltration and coating, the effect of dense and defect-free structure, reduced sintering time and smooth surface can be achieved.

Pending Publication Date: 2020-08-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When preparing filler / PTFE composite film, under the strong cutting action of turning, filler and PTFE are prone to interfacial separation, which makes the film more defects and poorer performance. content is lower than 20wt%), there is no report on the preparation of high filler loading PTFE composite film
In the process of calendering, due to the fluidity and viscosity, the shear rate in different parts of the slurry flow is inconsistent, resulting in obvious differences in fibrosis of the product as a whole, thus weakening the structural uniformity and mechanical properties of the PTFE composite film. Therefore, this method is usually used to prepare PTFE microporous membranes, fibers, etc., and there is no research on the preparation of highly filled and dense PTFE composite membrane materials.
At the same time, these two traditional PTFE membrane material molding processes both use PTFE resin particles of different sizes to prepare composite membrane materials through dry blending, resulting in poor filler dispersion and low degree of infiltration and coating of resin particles, so it cannot be realized. Preparation of High Filling and High Performance PTFE Composite Film

Method used

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  • High-filling-capacity polytetrafluoroethylene composite film and preparation method thereof

Examples

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preparation example Construction

[0038] The present invention also provides a method for preparing a high-fill polytetrafluoroethylene composite film, comprising the steps of:

[0039] (1) mixing raw materials except the filler to obtain a polytetrafluoroethylene composite dispersion, then adding filler to obtain a compound;

[0040] (2) using the mixture to coat a layer of thin film, followed by drying and sintering to obtain a coating;

[0041] (3) Repeat step (2) on the surface of the resulting coating until the high-filling polytetrafluoroethylene composite film is obtained.

[0042] When the present invention prepares the polytetrafluoroethylene composite film with a high filling amount, the raw materials except the filler are first mixed to obtain the polytetrafluoroethylene composite dispersion liquid, and then the filler is added to the polytetrafluoroethylene composite dispersion liquid to obtain the mixture .

[0043]After the mixture is prepared in the present invention, a layer of film is first ...

Embodiment 1

[0049] Take 100 parts of 0.3μm 60wt% polytetrafluoroethylene dispersion and 2 parts of dispersant, 2 parts of active agent, 1 part of modifier, 2 parts of stabilizer, 1 part of leveling agent, 1 part of defoamer, 1 part of The antioxidants are mixed to obtain a polytetrafluoroethylene composite dispersion, and then the polytetrafluoroethylene composite dispersion is mixed with 100 parts of fillers to obtain a compound. The filler used in this example is a mixed filler mixed with inorganic filler, organic filler and metal particles at a mass ratio of 1:1:2, wherein the inorganic filler is glass fiber, the organic filler is polyphenylene ether, and the metal particle is iron powder. Use this mixture to coat a film, first dry at 60°C for 20 minutes, and then sinter at 360°C for 30 minutes to obtain a layer of coating. The coating has a thickness of 40 μm. Repeat coating once on the surface of the obtained coating to prepare a polytetrafluoroethylene composite film with a thickne...

Embodiment 2

[0052] Take 100 parts of 0.2 μm 60wt% polytetrafluoroethylene dispersion and 2 parts of dispersant, 2 parts of active agent, 2 parts of modifier, 2 parts of stabilizer, 1 part of leveling agent, 1 part of defoamer, 1 part of The antioxidants were mixed to obtain a polytetrafluoroethylene composite dispersion, and then the polytetrafluoroethylene composite dispersion was mixed with 150 parts of fillers to obtain a compound. The filler used in this example is a mixed filler mixed with inorganic filler, organic filler and metal particles according to the mass ratio of 3:2:1, wherein the inorganic filler is a mixture of alumina and silica, the organic filler is polyarylsulfone, and the metal particle The particles are mixed with copper powder and aluminum powder. Use this mixture to coat a film, first dry at 100°C for 8 minutes, and then sinter at 380°C for 60 minutes to obtain a layer of coating. The coating has a thickness of 40 μm. Repeat the coating step once on the surface ...

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Abstract

The invention belongs to the technical field of high-performance composite materials, and provides a high-filling-capacity polytetrafluoroethylene composite film and a preparation method thereof. Thehigh-filling-capacity polytetrafluoroethylene composite film provided by the invention is prepared from the following raw materials in parts by weight: 100 parts of polytetrafluoroethylene dispersionliquid, 30-300 parts of filler, 0-4 parts of dispersing agent, 0-4 parts of active agent, 0-4 parts of modifier, 0-4 parts of stabilizer, 0-2 parts of leveling agent, 0-2 parts of defoamer and 0-2 parts of antioxidant. According to the high-filling-amount polytetrafluoroethylene composite film provided by the invention, the filling amount of the filler can reach 30-80%, and the high-filling-amountpolytetrafluoroethylene composite film has the characteristics of large filling amount of the filler, excellent mechanical properties and good thermal dimensional stability.

Description

technical field [0001] The invention belongs to the technical field of high-performance composite materials, and in particular relates to a high-filling polytetrafluoroethylene composite film and a preparation method thereof. Background technique [0002] In order to realize the multi-functional and high-performance application of polytetrafluoroethylene (PTFE), the filler / PTFE composite material has been prepared by adding various fillers to the PTFE suspension resin and dispersion resin, so that it not only maintains the excellent performance of PTFE but also It can improve the dimensional stability and wear resistance of PTFE. Most of the existing PTFE-based filled composite materials are PTFE-filled thick-walled products (thickness>0.5mm), and due to the difficulties of PTFE’s high crystallinity, high melting point, poor melt fluidity, and immature film forming process, currently There is little research on PTFE membrane materials, so there are very few domestically ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08L71/12C08L81/02C08L67/00C08L77/00C08L77/10C08L59/00C08L61/02C08K7/14C08K3/08C08K13/04C08K7/06C08K3/04C08K13/02C08K3/22C08K3/38C08J5/18
CPCC08J5/18C08J2327/18C08J2459/00C08J2461/02C08J2467/00C08J2471/12C08J2477/00C08J2477/10C08J2481/02C08K3/04C08K7/06C08K7/14C08K13/02C08K13/04C08K2003/0812C08K2003/085C08K2003/0856C08K2003/0862C08K2003/2241C08K2003/3009C08K2003/385C08K3/041
Inventor 郭少云周茜陈蓉
Owner SICHUAN UNIV
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