Transparent polyimide film and preparation method thereof

A transparent polyimide and film technology, applied in the field of new materials, can solve problems such as low transmittance

Inactive Publication Date: 2015-06-03
饶先花
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, polyimide resin is usually brown or yellow, which leads to the disadvantage of low transmittance in the visible light range, so it cannot be used in fields that require transparency, such as the aforementioned flexible display and flexible solar cells.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Add glass beads (D 50 Less than 10um) dispersed in a mixed solvent of ethanol and water (m 乙醇 :m 水 =1:2), stir with an electric mixer for 30 minutes until uniform, add the silane coupling agent into the dispersing mixed solvent, stir for another 30 minutes until uniform, filter with suction, and dry to constant weight to obtain modified inorganic materials or inorganic nanomaterials, The weight of the coupling agent is 0.5% of the weight of the inorganic material or inorganic nano material.

[0033] 2) Synthesis of polyamic acid solution: Dissolve m-phenylenediamine in the solvent DMF, then add 4,4-hexafluoroisopropylphthalic anhydride into the above solution in a solid state, and stir the reaction under nitrogen. The reaction time is 6h. The molar ratio of m-phenylenediamine to 4,4-hexafluoroisopropylphthalic anhydride was 0.97.

[0034] 3) Add the modified glass microspheres to the solution after the reaction in step 2), and stir vigorously to mix evenly. The ...

Embodiment 2

[0038] 1) will graphene (D 50 less than 10um) dispersed in solvent m 乙醇 :m 水 =1:1, stir with an electric mixer for 30 minutes until uniform, add the titanate coupling agent into the dispersion medium, stir for another 30 minutes until uniform, filter with suction, and dry to constant weight to obtain modified inorganic materials or inorganic nanomaterials, The weight of the coupling agent is 3% of the weight of the inorganic material or inorganic nano material.

[0039] 2) Synthesis of polyamic acid solution: Dissolve p-phenylenediamine in the solvent DMSO, and then add 3,3'4,4'-tetracarboxylic diphenyl ether dianhydride into the above solution in solid state, solid 3,3 '4,4'-Tetracarboxylic acid diphenyl ether dianhydride undergoes an exothermic ring-opening reaction with diamine while dissolving, and the reaction time is 5 hours. The molar ratio of p-phenylenediamine to 3,3'4,4'-tetracarboxylic diphenyl ether dianhydride is 1.0.

[0040] 3) Add the modified graphene to t...

Embodiment 3

[0044] 1) will nano-SiO 2 (D 50 Less than 10um) dispersed in solvent (m 乙醇 :m 水 =1:1), stir with an electric mixer for 30min until uniform, add the chromium complex coupling agent, stir for another 30min until uniform, filter with suction, dry to constant weight to obtain modified inorganic nanomaterials, the coupling The weight of the coupling agent and the inorganic nano-SiO 2 2% by weight.

[0045] 2) Synthesis of polyamic acid solution: Dissolve 1,4-bis(3-aminophenoxybenzene) in DMF, and then add 2,2',3,3'-tetracarboxylic benzophenone dianhydride to The solid state is added to the above solution, and the solid 2,2',3,3'-tetracarboxylic acid benzophenone dianhydride undergoes an exothermic ring-opening reaction with diamine while dissolving, and the reaction time is 2 hours. The molar ratio of 1,4-bis(3-aminophenoxybenzene) to 2,2',3,3'-tetracarboxylic benzophenone dianhydride was 1.03.

[0046] 3) The modified inorganic nano-SiO 2 Add to the solution after the react...

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Abstract

The invention discloses a transparent polyimide film. The transparent polyimide film is prepared from a copolymer of aromatic dianhydride and aromatic diamine, and can be modified by adding inorganic materials or inorganic nano-materials into the polymer. The thickness of the film is 25-100 microns, and the Tg temperature range is 180-350 DEG C; the film has low heat expansion coefficient with 3-30 ppm under the Tg temperature, has cutoff wavelength of 550 nm measured by an ultraviolet spectrophotometer and has average transmission rate of 85 percent or more in the range of 380-780 nm. The invention also discloses a preparation method of the transparent polyimide film. The film is high in mechanical property, high in heat stability and suitable for transparent electric conductive films, film transistor substrates, flexible printed circuit boards, solar battery flexible substrates, flexible substrates for flexible display of a new generation of OLED, and the like.

Description

Technical field [0001] The present invention involves a transparent polypelide film and its preparation method, which is a new material technology field. Background technique [0002] Flexible electronic technology is an important direction for the development of the electronic information industry in the past 10 years. Because flexible displays have many advantages: impact resistance, stronger seismic resistance; light weight, small volume, more convenient to carry, and broad market prospects. In recent yearsCome to people more than people's lives.As an important part of the flexible display device, the performance of the flexible display board has an important impact on the quality and life of flexible display devices.The rapid development of a new generation of information industry represented by flexible electronics and flexible display has put forward urgent demand for optical membrane materials. [0003] As a flexible display substrate material, there are several aspects of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08G73/10C08J5/18C08K9/06C08K7/20C08K9/04C08K3/04C08K3/36C08K3/22
CPCC08K9/06C08G73/1067C08G73/1071C08J5/18C08J2379/08C08K3/04C08K3/22C08K3/36C08K7/20C08K9/04C08K2003/2227C08K2201/003C08K2201/011C08L2201/08C08L2201/10C08L2203/16C08L2203/20C08L79/08
Inventor 陈定秀
Owner 饶先花
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