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A kind of polyimide film and preparation method thereof

A polyimide film and polyamic acid technology, which is applied in the field of new materials, can solve the problems that the glass transition temperature cannot meet the requirements of TFT processing temperature and affect the widespread use of AMOLED devices, and achieves improved heat resistance, easy availability, The effect of easy mass production

Active Publication Date: 2022-04-29
南京精工新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the glass transition temperature of these materials cannot meet the temperature requirements of TFT processing (above 400 ° C), which affects the wide use in AMOLED devices

Method used

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  • A kind of polyimide film and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Under the condition of nitrogen at room temperature, take 5.503g of nano-silica particles and add them to 45ml of dimethylacetamide solution, drop in 0.272g of γ-aminopropyltriethoxysilane, then ultrasonically disperse for 30min and then stir for 12h. After standing for 24 hours, it was filtered to obtain a nano-silica dispersion.

[0024] Take 450ml of dimethylacetamide, add 29.630g of p-phenylenediamine (p-PDA) under the condition of blowing nitrogen, and add 80.616g of biphenyltetracarboxylic dianhydride (s-BPDA) after stirring for 30min. Stir for 6h to obtain a polyamic acid solution.

[0025] The nano-silica dispersion liquid was added into the polyamic acid solution, stirred for 3 hours, and then defoamed under vacuum conditions to obtain a polyamic acid composite solution. Apply the polyamic acid composite solution on a glass plate through a slit, and then place the glass plate in a drying oven to dry at 60°C / 1h and 120°C / 30min to obtain a polyamic acid film. A...

Embodiment 2

[0027] Under the condition of nitrogen at room temperature, take 2.251g of nano-silica particles and add them to 45ml of dimethylacetamide solution, drop in 0.118g of γ-aminopropyltriethoxysilane, then ultrasonically disperse for 30min and then stir for 12h. After standing for 24 hours, it was filtered to obtain a nano-silica dispersion.

[0028] Take 450ml of dimethylacetamide, add 29.631g of p-phenylenediamine (p-PDA) under the condition of nitrogen, and add 80.617g of biphenyltetracarboxylic dianhydride (s-BPDA) after stirring for 30min. Stir for 6h to obtain a polyamic acid solution.

[0029] The nano-silica dispersion liquid was added into the polyamic acid solution, stirred for 3 hours, and then defoamed under vacuum conditions to obtain a polyamic acid composite solution. Apply the polyamic acid composite solution on a glass plate through a slit, and then place the glass plate in a drying oven to dry at 60°C / 1h and 120°C / 30min to obtain a polyamic acid film. After peeli...

Embodiment 3

[0031] Under the condition of nitrogen at room temperature, take 1.135g of nano-silica particles and add them to 45ml of dimethylacetamide solution, drop in 0.061g of γ-aminopropyltriethoxysilane, then ultrasonically disperse for 30min and then stir for 12h. After standing for 24 hours, it was filtered to obtain a nano-silica dispersion.

[0032] Take 450ml of dimethylacetamide, add 29.632g of p-phenylenediamine (p-PDA) under the condition of blowing nitrogen, and add 80.617g of biphenyltetracarboxylic dianhydride (s-BPDA) after stirring for 30min. Stir for 6h to obtain a polyamic acid solution.

[0033] The nano-silica dispersion liquid was added into the polyamic acid solution, stirred for 3 hours, and then defoamed under vacuum conditions to obtain a polyamic acid composite solution. Apply the polyamic acid composite solution on a glass plate through a slit, and then place the glass plate in a drying oven to dry at 60°C / 1h and 120°C / 30min to obtain a polyamic acid film. A...

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Abstract

The invention discloses a preparation method of a polyimide film, comprising: adding nano powder and a dispersant to an aprotic polar solvent under a nitrogen atmosphere, stirring after ultrasonic dispersion, standing for 24 to 48 hours of aging, and then filtering , to obtain nano-powder solidifying agent dispersion A; pass nitrogen gas into the aprotic solution for 30 minutes, add diamine monomer, stir until completely dissolved, then add dianhydride monomer and stir to obtain a viscosity of 5000~200000 mPa·s The polyamic acid solution B; Add the dispersion A to the solution B, stir evenly, vacuum degassing for 0.5~12 h, and then apply it on a glass plate through a slit to obtain a uniformly distributed glue film. The liquid film is dried in a drying oven. After taking it out, it is peeled off from the glass plate to obtain an adhesive film. The adhesive film is placed in a high-temperature oven for high-temperature heat treatment and cooled. The film of the present invention has high strength and high modulus, and the glass transition temperature exceeds 430 o C, coefficient of thermal expansion 7ppm / o Below C.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a polyimide film and a preparation method thereof. Background technique [0002] In 2019, Samsung and Huawei successively launched OLED foldable screen smartphones, and the flexible display industry is showing a trend of rapid development. In 2019, the global shipment of flexible AMOLED smartphone panels was about 180 million pieces, a year-on-year increase of 6.2%. With the increasing demand of terminal brands for flexible AMOLED models, it is expected that the shipment of flexible smartphone panels will exceed 300 million pieces in 2020, a year-on-year increase of more than 50%. According to IHS data, the compound growth rate of the flexible AMOLED industry will exceed 80% in the next five years. With the transformation of OLED technology from rigid to flexible, the original glass, PET and other materials can no longer meet the demand, and the cover, touch a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L79/08C08K3/36C08K3/26C08K3/22C08K3/34C08K3/04
CPCC08J5/18C08J2379/08C08K3/36C08K2003/265C08K2003/2241C08K3/34C08K3/346C08K3/042C08K2201/011
Inventor 刘榛王恺史莹飞吕从江石俊峰张鹏孙鹏
Owner 南京精工新材料有限公司