Wear-resistant polyimide composite film and preparation method thereof

A technology of polyimide and composite film, which is applied in the direction of coating, etc., can solve the problems of limited improvement of wear resistance, performance difference, and reduction of film light reflection, etc., to achieve continuous industrial production, stable product quality, and improved wear resistance performance effect

Active Publication Date: 2021-05-07
SUZHOU TAIHU ELECTRIC ADVANCED MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese patent application CN201310003942.0 discloses a polyimide film, in which silicon dioxide powder and graphene powder are directly dispersed into the polyimide film, It can reduce the light reflection of the film and reduce the light transmittance. However, the film prepared by this preparation method has an impact on the overall performance of the film due to the uneven dispersion of particles inside the matrix. Compared with similar foreign products, the overall performance is relatively large. difference
However, this method cannot be used for continuous production, and it is difficult to control the amount of silicon dioxide deposited consistently. The silicon dioxide is attached as particles without forming a dense continuous film, and the improvement of wear resistance is limited.

Method used

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  • Wear-resistant polyimide composite film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] This example provides a silica / graphene mixed glue solution, the preparation process of which is as follows:

[0035]Mix 222.56mL tetraethyl orthosilicate (TEOS) and 287.5mL absolute ethanol thoroughly for about 30min under strong stirring with a magnetic stirrer, then add 36mL deionized water dropwise into the mixed solution for about 15min, continue Stir the above mixture magnetically in an ice bath for 12 hours, then add 545 mL of N,N-dimethylacetamide, continue to stir for 12 hours, then add 9.84 g of graphene oxide to the mixed glue, continue ultrasonic and magnetic stirring for 2 hours, The resulting silica / graphene mixed glue has a kinematic viscosity of 0.009cm at 25°C 2 / s~0.02cm 2 Between / s, stand still for later use.

Embodiment 2

[0037] This example provides a silica / graphene mixed glue solution, the preparation process of which is as follows:

[0038] Mix 222.56mL TEOS and 287.5mL absolute ethanol thoroughly for about 30min under strong stirring with a magnetic stirrer, then add 36mL deionized water dropwise into the mixed solution for about 15min, and continue to put the above mixture in an ice bath Stir magnetically for 12 hours, then add 545mL of N,N-dimethylacetamide, continue stirring for 12 hours, then add 49.2g graphene oxide to the mixed glue, continue ultrasonic and magnetic stirring for 2 hours, and obtain silica / graphite Alkene mixed glue, kinematic viscosity at 25°C is 0.009cm 2 / s~0.02cm 2 Between / s, stand still for later use.

Embodiment 3

[0040] This example provides a silica / graphene mixed glue solution, the preparation process of which is as follows:

[0041] Mix 222.56mL of TEOS and 575mL of absolute ethanol for about 30min under strong stirring with a magnetic stirrer, then add 90mL of deionized water dropwise into the mixed solution for about 35min. Stir for 12 hours, then add 887mL of N,N-dimethylacetamide, continue to stir for 12 hours, then add 49.2g of graphene oxide to the mixed glue, continue ultrasonic and magnetic stirring for 2 hours, and obtain silica / graphene The mixed glue has a kinematic viscosity of 0.009cm at 25°C 2 / s~0.02cm 2 Between / s, stand still for later use.

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Abstract

The invention discloses a wear-resistant polyimide composite film and a preparation method thereof. The preparation method comprises the following steps: 1) preparing a silica / graphene glue solution, the kinematic viscosity of the glue solution at 25 DEG C is 0.005 cm <2> / s 0.03 cm <2> / s, and the mass fraction of graphene oxide contained in the glue solution is 1 wt%-5 wt%; (2) carrying out surface modification treatment on the polyimide pure membrane by using alkali liquor; (3) coating the polyimide pure film subjected to surface modification treatment with the silicon dioxide / graphene glue solution by adopting a pulling method, and then sequentially carrying out sealing aging and heat treatment forming to form a silicon dioxide / graphene coating, namely the polyimide composite film. According to the polyimide composite film disclosed by the invention, the inorganic coating is tightly combined with the organic matrix, inorganic particles are uniformly dispersed, and the wear resistance is more excellent while the film maintains relatively good mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of high molecular polymer materials, and in particular relates to a polyimide composite film and a preparation method thereof. Background technique [0002] Polyimide is currently the best film insulating material in the world, and it is widely used in various fields. However, the production of high-performance polyimide films in China is still blank at present, and most of them rely on imports. [0003] Studies have shown that adding a certain amount of inorganic nanoparticles (typically silicon dioxide) to the polyimide matrix can greatly improve its wear resistance, but as the doping amount increases, the mechanical properties of the composite film are relatively pure. The polyimide film has dropped a lot. In order to achieve good wear resistance, a higher doping amount must be carried out. At this time, the mechanical properties of the film are seriously reduced, making it unusable, which limits the pol...

Claims

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Application Information

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IPC IPC(8): C08J7/06C08J7/046C08J7/043C08J7/12C08L79/08
CPCC08J7/06C08J7/046C08J7/043C08J7/12C08J2379/08
Inventor张明玉吴斌张超翁凌周良周晓晨周林江张春琪
OwnerSUZHOU TAIHU ELECTRIC ADVANCED MATERIAL CO LTD