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Polyimide resin and polyimide film with self-repairing function, preparation methods thereof and flexible foldable display screen cover plate base film

A polyimide resin and polyimide film technology, applied in the field of materials, can solve the problems of poor mechanical properties, limit the times and efficiency of self-healing, and achieve stable process, simple operation and high light transmittance. Effect

Active Publication Date: 2021-09-14
NINGBO CHANGYANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the self-healing materials prepared by the aforementioned known technologies have their own defects. The former has a fixed number of microcapsules, which limits the number and efficiency of self-healing. The latter is based on a supramolecular structure. bad

Method used

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  • Polyimide resin and polyimide film with self-repairing function, preparation methods thereof and flexible foldable display screen cover plate base film
  • Polyimide resin and polyimide film with self-repairing function, preparation methods thereof and flexible foldable display screen cover plate base film
  • Polyimide resin and polyimide film with self-repairing function, preparation methods thereof and flexible foldable display screen cover plate base film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0057] As an optional embodiment of the present invention, the diamine monomers include 2,2'-bistrifluoromethyl-4,4'-diaminobiphenyl, 1,4-bis(4-amino-2-tri Fluoromethylphenoxy)benzene, 9,9-bis(4-aminophenyl)fluorene, 2,2-bis[4-(4-aminophenoxy)phenyl]propane, 2,2-bis[ Any one or a combination of at least two of 4-(4-aminophenoxy)phenyl]hexafluoropropane or 4,4'-bis(3-aminophenoxy)diphenylsulfone.

[0058] As an optional embodiment of the present invention, the dianhydride monomer includes 4,4-hexafluoroisopropylphthalic anhydride, 1,2,3,4-cyclobutanetetracarboxylic dianhydride, 4,4 Any one or a combination of at least two of '-oxybisphthalic anhydride, biphenyltetracarboxylic dianhydride or bisphenol A diether dianhydride.

[0059] As an optional embodiment of the present invention, the dehydrating agent includes any one or a combination of at least two of acetic anhydride, propionic anhydride or butyric anhydride.

[0060] As an optional embodiment of the present invention, ...

Embodiment approach

[0093] As a preferred embodiment of the present invention, the preparation method of the polyimide film with self-healing function comprises the following steps:

[0094] Dissolving the polyimide resin in the second solvent, drying at 60-80°C for 20-40 minutes, at 120-150°C for 20-40 minutes and at 220-250°C for 40-60 minutes in a nitrogen atmosphere, to obtain Repair function polyimide film.

[0095] By further limiting the preparation method of the polyimide film, the second solvent can be completely volatilized.

[0096] According to the fifth aspect of the present invention, there is also provided a base film for a flexible and foldable display screen cover, which is made of the above-mentioned polyimide resin with self-repair function or the above-mentioned polyimide film with self-repair function .

[0097] In view of the advantages of the above-mentioned polyimide resin or polyimide film with self-healing function, the flexible foldable display cover base film that uses...

Embodiment 1

[0100] This embodiment provides a polyimide resin with self-healing function, which is mainly made of the following raw materials:

[0101] Diamine monomer, dianhydride monomer, furfurylamine, maleic anhydride, dehydrating agent and catalyst.

[0102] Among them, the diamine monomer is 2,2'-bistrifluoromethyl-4,4'-diaminobiphenyl, the dianhydride monomer is 4,4-hexafluoroisopropylphthalic anhydride, and the diamine The molar ratio of monomer and dianhydride monomer is 1:1, maleic anhydride accounts for 1% of the total molar amount of diamine monomer and dianhydride monomer, furfurylamine accounts for the total molar amount of diamine monomer and dianhydride monomer 1% of the amount, the dehydrating agent is acetic anhydride, and the catalyst is pyridine.

[0103] The preparation method of the above-mentioned polyimide resin with self-repairing function comprises the following steps:

[0104] (a) Dissolve 16.01 g (50 mmol) of 2,2'-bistrifluoromethyl-4,4'-diaminobiphenyl in 15...

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Abstract

The invention provides polyimide resin and a polyimide film with a self-repairing function, preparation methods thereof and a flexible foldable display screen cover plate base film, and relates to the technical field of materials. The polyimide resin is mainly prepared from a diamine monomer, a dianhydride monomer, an end-capping reagent, a dehydrating agent, a catalyst and other raw materials, furfuryl amine and maleic anhydride are used as the end-capping reagent, conjugated diene and substituted olefin structures can be introduced into a polyimide resin main body structure, and on the basis of a dynamic reversible Diels-Alder reaction, a cyclohexene structure is cracked at a relatively high temperature to generate the furfuryl amine and maleic anhydride, and furfuryl amine and maleic anhydride spontaneously react in a cooling process to produce the cyclohexene structure, so that self-repairing of the polyimide resin is realized. The invention also provides the polyimide film with the self-repairing function, the polyimide film is prepared from the polyimide resin, the polyimide film has the self-repairing function, and the repairing effect is not reduced along with the increase of the repeating times.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a polyimide resin with self-repairing function, a polyimide film, a preparation method and a flexible foldable display screen cover plate base film. Background technique [0002] Due to the strong interaction between molecular chains and the high rigidity of molecular chains, polyimide has excellent mechanical strength and heat resistance, and has shown broad application prospects in the fields of medical care, electronics, and aerospace. In particular, the development of colorless and transparent polyimide materials has further expanded the application of polyimide in the field of flexible displays. Although the colorless and transparent polyimide film has good strength and toughness, local damage or microcracks will inevitably occur during repeated folding, which will cause the expansion of macroscopic cracks and ultimately affect the integrity and stability of the material. ...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08J5/18C08L79/08
CPCC08G73/1067C08G73/1039C08G73/1014C08G73/1017C08G73/1071C08G73/1064C08G73/1042C08G73/1075C08G73/1078C08J5/18C08J2379/08
Inventor 张远豪周玉波金亚东
Owner NINGBO CHANGYANG TECH
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