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Colorless transparent polyimide thin film and preparation method thereof

A technology of transparent polyimide and polyamic acid, applied in the field of transparent polyimide film and its preparation, can solve the problems of low light transmittance, limited application, poor light transmittance, etc., and achieve the effect of excellent mechanical properties

Active Publication Date: 2018-08-21
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its application in microelectronics and optoelectronics is severely limited due to its dark color and poor light transmittance.
The traditional polyimide film is brownish-yellow, and has a low transmittance to visible light (wavelength 400-700nm), and to 500nm visible light, the transmittance is less than 40%; visible light with a wavelength of 400nm is absorbed by 100%, which is severely limited. Its application in the field of optoelectronics

Method used

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  • Colorless transparent polyimide thin film and preparation method thereof
  • Colorless transparent polyimide thin film and preparation method thereof
  • Colorless transparent polyimide thin film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This example realizes the preparation of transparent polyimide film in the following ways:

[0026] 1. Add 21.62g of fluorine-containing diamine 2,2'-bis(trifluoromethyl)-4,4'-diaminophenyl ether to 238.83g of polar aprotic solvent protected by nitrogen or inert gas (N, In N-dimethylacetamide), at 10-30°C, stir to dissolve completely, control the molar ratio of diamine to anhydride to 1:1-1.02, add the copolymerized anhydride 4,4-hexafluoroisopropane Base phthalic anhydride and cyclobutanetetracarboxylic dianhydride with a mole fraction of aliphatic acid anhydride of 50% were reacted for 24 hours to obtain a transparent polyamic acid solution. Herein, the mole fraction of aliphatic acid anhydride refers to the ratio of the mole number of aliphatic acid anhydride to the sum of the mole number of copolymeric acid anhydride and the mole number of aliphatic acid anhydride.

[0027] 2. Apply the polyamic acid solution obtained in step 1 evenly on a clean glass plate, then p...

Embodiment 2

[0029] The fluorine-containing diamine described in step 1 is 2,2'-bistrifluoromethyl-4,4'-diaminobiphenyl. Others are the same as in Example 1, the effect is that the flexibility of the transparent polyimide film is reduced, and the mechanical properties are better.

Embodiment 3

[0031] The copolymerized acid anhydride described in the first step is 1,2,4,5-pyromellitic dianhydride. Other is the same as embodiment 1, and its effect is: the copolymeric acid anhydride is different, and the transparency of transparent polyimide film is different.

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Abstract

The invention discloses a preparation method of a colorless transparent polyimide thin film. The preparation method comprises the following steps: (1) adding fluorinated diamine into a polar aprotic solvent protected by nitrogen or inert gas, stirring the fluorinated diamine at 10 to 50 DEG C till the fluorinated diamine is completely dissolved, adding copolyanhydride and aliphatic anhydride at acertain mole fraction, controlling a mole ratio of the diamine to the anhydride at 1:(1 to 1.02), and carrying out a reaction for 6 to 24 hours, thereby obtaining a transparent polyamide acid solution; (2) uniformly coating a clean substrate with the polyamide acid solution obtained in step (1) at a predetermined thickness, then placing the clean substrate into a vacuum drying oven for programmedheating to certain temperature, removing the solvent, performing thermal imidization, taking out a glass board after the temperature of the vacuum drying oven is reduced to environmental temperature,and demolding and drying the glass board, thereby obtaining the transparent polyimide thin film. The transparent polyimide thin film prepared according to the preparation method is high in transparency, excellent in thermal stability and high in mechanical property.

Description

technical field [0001] The invention relates to the field of polymer films, and specifically discloses a transparent polyimide film and a preparation method thereof. Background technique [0002] Polyimide (PI) has been widely used in aviation, aerospace, automobile, machinery and other industries because of its excellent thermal properties, mechanical properties, electrical properties and excellent comprehensive properties. However, its dark color and poor light transmittance severely limit its applications in the fields of microelectronics and optoelectronics. The traditional polyimide film is brownish-yellow, and has a low transmittance to visible light (wavelength 400-700nm), and to 500nm visible light, the transmittance is less than 40%; visible light with a wavelength of 400nm is absorbed by 100%, which is severely limited. its application in the field of optoelectronics. The color of polyimide is mainly due to the formation of charge-transfer complexes between molec...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08G73/10C08L79/08
CPCC08G73/1007C08G73/1039C08G73/1042C08G73/1046C08G73/105C08G73/1075C08J5/18C08J2379/08
Inventor 路庆华徐文华苏远海
Owner TONGJI UNIV
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