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Polyimide film as well as preparation method, flexible substrate and application thereof

A flexible polyimide, polyimide technology, applied in the field of polyimide film and its preparation, can solve the problems of inability to meet the application requirements of flexible displays, and achieve the effect of good high temperature dimensional stability

Active Publication Date: 2015-12-09
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the substrate has excellent optical transparency, its CTE≥40ppm / ℃ cannot meet the application requirements of flexible displays

Method used

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  • Polyimide film as well as preparation method, flexible substrate and application thereof
  • Polyimide film as well as preparation method, flexible substrate and application thereof
  • Polyimide film as well as preparation method, flexible substrate and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The polyimide shown in formula I is prepared by sBPDA and 1,3-dimethyl-1,2,3,4-cyclobutane tetraacid dianhydride (MCBDA) in a ratio of 90:10 (molar ratio)

[0038] Add 10.8140 g (0.1 mol) of p-phenylenediamine and 60 g of NMP into a 500 mL three-necked flask equipped with a nitrogen inlet, a thermometer and a feeding port. After stirring at room temperature to dissolve completely, 2.2417g (0.01mol) MCBDA and 26.4798g (0.09mol) sBPDA were added, and 98g NMP was added to adjust the solid content to 20% (weight percent). After stirring at room temperature for 24 h, a light brown viscous solution was obtained. The solution was filtered to remove insoluble impurities. The obtained solution was evenly coated on a clean glass substrate, and the film thickness was controlled by a doctor blade. Place the glass plate in a clean drying oven protected by nitrogen and perform thermal imidization according to the following procedure: 80°C / 3h+120°C / 3h+150°C / 1h+180°C / 1h+250°C / 1h+300°...

Embodiment 2

[0044] Be 85:15 (molar ratio) by ratio sBPDA and 1,3-dimethyl-1,2,3,4-cyclobutane tetraacid dianhydride (MCBDA) polyimide shown in formula I

[0045] Add 10.8140 g (0.1 mol) of p-phenylenediamine and 60 g of NMP into a 500 mL three-necked flask equipped with a nitrogen inlet, a thermometer and a feeding port. After stirring at room temperature to dissolve completely, 3.3626g (0.015mol) MCBDA and 25.0087g (0.085mol) sBPDA were added, and 96g NMP was added to adjust the solid content to 20% (weight percent). After stirring at room temperature for 24 h, a light brown viscous solution was obtained. The solution was filtered to remove insoluble impurities. The obtained solution was evenly coated on a clean glass substrate, and the film thickness was controlled by a doctor blade. Put the glass plate in a clean drying oven protected by nitrogen and carry out thermal imidization according to the following procedure: 80°C / 3h+120°C / 3h+150°C / 1h+180°C / 1h+250°C / 1h+300°C / 1h +350°C / 1h. N...

Embodiment 3

[0051] The polyimide shown in formula I is prepared by sBPDA and 1,3-dimethyl-1,2,3,4-cyclobutane tetraacid dianhydride (MCBDA) in a ratio of 80:20 (molar ratio)

[0052] Add 10.8140 g (0.1 mol) of p-phenylenediamine and 60 g of NMP into a 500 mL three-necked flask equipped with a nitrogen inlet, a thermometer and a feeding port. After stirring at room temperature to dissolve completely, 4.4834g (0.02mol) MCBDA and 23.5376g (0.08mol) sBPDA were added, and 95g NMP was added to adjust the solid content to 20% (weight percent). After stirring at room temperature for 24 h, a light brown viscous solution was obtained. The solution was filtered to remove insoluble impurities. The obtained solution was evenly coated on a clean glass substrate, and the film thickness was controlled by a doctor blade. Put the glass plate in a clean drying oven protected by nitrogen and carry out thermal imidization according to the following procedure: 80°C / 3h+120°C / 3h+150°C / 1h+180°C / 1h+250°C / 1h+300°...

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Abstract

The invention discloses a polyimide film as well as a preparation method, a flexible substrate and application thereof. The polyimide is prepared by taking an aromatic dianhydride compound such as 3, 3 minute, 4, 4 minute-biphenyltetracarboxylic dianhydride (sBPDA), cycloaliphatic dianhydride compound 1, 2, 3, 4-cyclobutane tetracid dianhydride (CBDA) or 1, 3-dimethyl-1, 2, 3, 4-cyclobutane tetracid dianhydride (MCBDA) and an aromatic diamine compound as raw materials by virtue of a thermal imidization method. By adjusting the ratio of sBPDA and CBDA or MCBDA, the heat-resisting stability and optical transparence of the polyimide film substrate can be controlled. The film can be used as a flexible substrate to be applied to a flexible display device such as a flexible AMOLED (Active Matrix / Organic Light Emitting Diode), a flexible TFT-LCD (Thin Film Transistor Liquid Crystal Display) and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polyimide film, a preparation method thereof, a flexible substrate and its application. Background technique [0002] Flexible electronics and flexible display technology is one of the most active research directions in the field of electronic information in the past ten years, and it is also one of the important directions for the development of electronic information industry. Flexible electronic products with light weight, bendable, foldable and even rollable characteristics, including flexible thin film transistor liquid crystal display (Flexible TFT-LCD), flexible organic light emitting display (Flexible OLED), etc., have gradually developed into one of the most promising high-tech industries. one. In the development of flexible display technology, the flexible substrate, as the supporting and protecting component of the entire flexible device, not o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08L79/08
Inventor 杨士勇倪洪江刘金刚杨海霞
Owner INST OF CHEM CHINESE ACAD OF SCI
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