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Colorless transparent polyimide film, preparation method thereof and LED film screen

A transparent polyimide and polyimide resin technology, applied in the film field, can solve the problems of low transmittance and elastic modulus, poor dimensional stability, and poor heat dissipation of film materials, and achieve high elastic modulus and transparent Good effect of service life and heat resistance

Pending Publication Date: 2021-05-25
NINGBO CHANGYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide a kind of colorless transparent polyimide film, to alleviate the low transmittance and elastic modulus of film material existing in the prior art, poor heat resistance, poor dimensional stability under high temperature, Technical problems such as poor heat dissipation

Method used

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  • Colorless transparent polyimide film, preparation method thereof and LED film screen
  • Colorless transparent polyimide film, preparation method thereof and LED film screen

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Embodiment approach

[0065] As an optional embodiment of the present invention, the dianhydride includes 50-100 mol% dianhydride A and 0-50 mol% dianhydride B.

[0066] Among them, dianhydride A includes 4,4'-hexafluoroisopropyl phthalic anhydride, 1,2,4,5-cyclohexane tetracarboxylic dianhydride, 1,2,3,4-cyclobutane tetra Any one or a combination of at least two of formic dianhydride or 1,2,3,4-cyclopentadicarboxylic dianhydride;

[0067] Dianhydride B includes pyromellitic dianhydride, 3,3',4,4'-biphenyltetracarboxylic dianhydride, 2,3,3',4-biphenyltetracarboxylic dianhydride, 3,3' ,4,4'-Benzophenone tetracarboxylic dianhydride, 4,4'-oxodiphthalic anhydride, 1,2,4,5-cyclohexanetetracarboxylic dianhydride, 1,2, Any one or a combination of at least two of 3,4-cyclobutanetetracarboxylic dianhydride, 1,2,3,4-cyclopentadicarboxylic dianhydride, bisphenol A dianhydride or bisphenol F dianhydride .

[0068] Typical but non-limiting amounts of dianhydride A are 50 mol%, 55 mol%, 60 mol%, 65 mol%, 70 m...

Embodiment 1

[0116] This embodiment provides a kind of colorless and transparent polyimide film, mainly adopts following raw material to make: polyimide resin and heat-conducting filler; Wherein, polyimide resin is mainly made of dianhydride A(1,2,3 , 4-cyclobutanetetracarboxylic dianhydride) and diamine A (2,2'-bis(trifluoromethyl)diaminobiphenyl) are obtained by polycondensation under the action of a dehydrating agent (acetic anhydride) and a catalyst (pyridine); The thermally conductive filler is a modified inorganic thermally conductive filler, that is, α-alumina modified by γ-aminopropyltriethoxysilane, and the mass of the thermally conductive filler accounts for 60% of the total mass of the colorless and transparent polyimide film.

[0117] The preparation method of the above-mentioned colorless transparent polyimide film provided in this embodiment comprises the following steps:

[0118] (a) Provide thermally conductive paste formed by thermally conductive fillers and organic polar ...

Embodiment 2

[0128]This embodiment provides a colorless and transparent polyimide film, except that the average particle size of the thermally conductive filler is changed from 0.05 μm to 0.5 μm, and the rest of the raw materials, dosage and preparation method are the same as those in Example 1.

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Abstract

The invention provides a colorless transparent polyimide film, a preparation method thereof and an LED film screen, and relates to the technical field of films. The colorless transparent polyimide film is mainly prepared from polyimide resin, a heat-conducting filler and other raw materials, the prepared colorless transparent polyimide film has high transmittance and excellent heat-conducting property, the appearance of a building wall cannot be affected after the colorless transparent polyimide film is made into an LED film screen, meanwhile, heat generated when an LED emits light can be rapidly conducted, the heat cannot be gathered to cause temperature rise, so that the luminous efficiency of the LED film screen cannot be influenced; in addition, the colorless transparent polyimide film also has the characteristics of high elastic modulus, good heat resistance, low possibility of deformation at high temperature, namely good high-temperature dimensional stability and the like, so that the LED film screen applying the colorless transparent polyimide film has corresponding characteristics. The invention also provides a preparation method of the colorless transparent polyimide film.

Description

technical field [0001] The invention relates to the technical field of films, in particular to a colorless transparent polyimide film, a preparation method thereof and an LED film sticking screen. Background technique [0002] In recent years, with the development of new display technology, outdoor LED display screens have begun to be put in large quantities to replace traditional paper billboards. The LED display screen can display animated images, the content is easy to replace, the colors are bright and eye-catching, so it is greatly favored. However, the traditional LED display is installed on the outer wall of the building, completely blocking the outdoor light, and the weight of the screen itself tests the safety of the building itself. In addition, when the outdoor LED display is not advertising, the entire black screen has an adverse effect on the appearance of the building wall. [0003] In order to solve this problem, the LED film screen combines all the advantag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08J5/18C08K9/06C08K3/22C08K3/28C08K3/04C08K3/38C08K3/34
CPCC08J5/18C08J2379/08C08K2201/005C08K9/06C08K2003/2227C08K2003/282C08K3/042C08K2003/385C08K3/34C08K3/28
Inventor 金亚东祝炬烨李智文朱正平
Owner NINGBO CHANGYANG TECH
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