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Transparent polyimide film and preparation method thereof

A technology of transparent polyimide and film, applied in the field of flexible display, to achieve the effect of increasing packing density, reducing thermal expansion coefficient and high strength

Inactive Publication Date: 2021-01-08
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the polymer substrate materials prepared in the prior art, it is still a difficult point in technological development to simultaneously meet the high heat resistance, high strength, low thermal expansion coefficient and sufficient transparency required for flexible displays.

Method used

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  • Transparent polyimide film and preparation method thereof
  • Transparent polyimide film and preparation method thereof
  • Transparent polyimide film and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0065] The present invention also provides a kind of preparation method of transparent polyimide film, comprises the following steps:

[0066] The diamine monomer and the dianhydride monomer are condensed and then imidized to obtain a transparent polyimide film.

[0067] Specifically, in the present invention, firstly, the diamine monomer, the dianhydride monomer and a solvent are mixed for condensation reaction to obtain a polyamic acid intermediate.

[0068] In the present invention, the method for obtaining the polyamic acid intermediate is not particularly limited, and it can be synthesized by methods known to those skilled in the art.

[0069] In the present invention, polyamic acid is obtained from monomeric dianhydride and monomeric diamine through the preparation method of polyimide solution polymerization well known to those skilled in the art. That is, mixing dianhydride monomers and diamine monomers in an organic solvent to react. In some specific embodiments of t...

Synthetic example 1

[0110] Add 3.623g of 4-aminophthalic acid and 80g of tetrahydrofuran into the reaction vessel, stir, and add 2.242g of cyclohexanetetracarboxylic dianhydride in batches at 10°C, and react for 15 hours. Filter and filter out the solid powder to obtain the tetraacid after drying. Add the obtained tetraacid into 100g of xylene, heat to reflux with water until the distilled water reaches the theoretical amount, cool, filter, and dry to obtain 5.00g of semi-fatty dianhydride (A1), with a yield of 97.2%. 1 HNMR (400MHz, DMSO-d 6 )δ: 8.20 (d, J = 8.1Hz, 2H), 7.96 (s, 2H), 7.86 (dd, J = 8.1, 1.2Hz, 2H), 3.39–3.21 (m, 4H), 2.34 (d, J =13.2Hz,2H),2.06(dd,J=22.2,9.6Hz,2H). 13 C NMR (101MHz, DMSO-d 6 )δ177.5, 162.5, 138.6, 134.0, 132.2, 130.5, 126.0, 123.1, 39.5, 38.0, 21.9.

[0111]

Synthetic example 2

[0113] Add 3.623g of 4-aminophthalic acid and 100g of acetonitrile into the reaction vessel, stir, and at 10°C, add 3.063g of bicyclohexanetetracarboxylic dianhydride in batches, and react for 12 hours. Filter and filter out the solid powder to obtain the tetraacid after drying. Add the obtained tetra-acid to 120g of cyclohexanone, and heat to reflux with water for 12h. Cool, filter, and dry to obtain 5.66 g of semi-fatty dianhydride (A2), with a yield of 95.0%. 1 HNMR (300MHz, DMSO-d 6 )δ:8.66(s,2H),8.40(d,J=7.5Hz,2H),7.72(d,J=7.5Hz,2H),2.60(m,2H),1.87(m,4H),1.42( m,2H),1.52(m,4H),1.27(m,4H). 13 C NMR (101MHz, DMSO-d 6 )δ176.7, 162.3, 140.4, 132.2, 129.8, 129.5, 126.7, 119.8, 37.7, 36.2, 35.5, 30.4, 28.2, 24.8.

[0114]

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Abstract

The invention provides a transparent polyimide film, which is prepared from a diamine compound and a dianhydride compound containing an imide structure and an alicyclic structure at the same time, wherein the dianhydride compound with the structure has the plane characteristic of a bisimide structure so as to improve the stacking density of a molecular chain is improved and reduce the thermal expansion coefficient, the dianhydride monomer has very high reaction activity so as to obtain high-molecular-weight polyimide to make the transparent film have very good mechanical properties, and particularly due to the introduction of the aryl structure, the heat resistance of the polyimide is also improved. The film provided by the invention has the advantages of high strength, low thermal expansion coefficient, heat resistance and enough transparency.

Description

technical field [0001] The invention belongs to the technical field of flexible display, and in particular relates to a transparent polyimide film and a preparation method thereof. Background technique [0002] Flexible display technology is an important development direction in the field of flat panel display. Flexible, flexible, and thin flexible display devices, such as flexible and thin organic light-emitting diode (OLED) displays, flexible solar cells, etc., have become an essential element of high-tech products in the consumer electronics field. Flexible display devices replace glass materials with polymer film materials to achieve thinner, lighter and more flexible displays. [0003] At present, colorless and transparent polyimide materials are required for the cover and substrate materials in flexible or foldable AMOLED displays. The wholly aromatic polyimide obtained by the polycondensation reaction of the commonly used aromatic tetracarboxylic dianhydride and aro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08J5/18C08L79/08
CPCC08G73/1085C08J5/18C08J2379/08
Inventor 郭海泉杨正慧康传情周云春高连勋
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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