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Polyimide, as well as preparation method and application thereof

A technology of polyimide and general formula, applied in the direction of chemical instruments and methods, instruments, liquid crystal materials, etc., can solve the problems of poor friction effect, increase, unfavorable opening ratio, etc., and achieve the effect of improving friction effect and improving uniformity

Inactive Publication Date: 2012-08-22
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following shortcomings in this solution: due to the need for black matrix shading, it is not conducive to the improvement of aperture ratio; it cannot fundamentally improve the defect of poor friction near the end difference area

Method used

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  • Polyimide, as well as preparation method and application thereof
  • Polyimide, as well as preparation method and application thereof
  • Polyimide, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] At room temperature and under nitrogen protection, 20g of p-di-n-hexylcyanopyromellitic dianhydride and 7.8g of p-diaminobiphenyl were mixed and stirred in 200ml of dry NMP (N-methylpyrrolidone) for 24h to obtain the following repeat Unit of polyamic acid liquid.

[0033]

[0034] IR(KBr): 1660cm -1 , 3260-3270cm -1 , 1720cm -1

[0035] Then the polyamic acid liquid obtained above is coated on the surface of the substrate. First, the above-mentioned substrate coated with the polyamic acid liquid is heated at 100° C. for about 2 minutes for pre-curing, and then heated at 230° C. for about 1 h for main curing to obtain a polyimide alignment film.

[0036] IR(KBr): 3260-3270cm -1

[0037] In the infrared spectrum, the stretching vibration of the carbonyl group in the amide group is hardly observed (1660cm -1 ) And the vibration of the carbonyl group of the carboxyl group in the aromatic carboxylic acid (1720cm -1 ), which shows that the amide group and the carboxyl group of the p...

Embodiment 2

[0039] At room temperature, under nitrogen protection, 22.3g terebis(6,6,6-trifluorohexyl)pyromellitic dianhydride and 7.8g p-diaminobiphenyl were mixed and stirred in 200ml dry NMP for 24h to obtain The following repeating unit of polyamic acid liquid.

[0040]

[0041] IR(KBr): 1660cm -1 , 3260-3270cm -1 , 1720cm -1

[0042] Then the polyamic acid liquid obtained above is coated on the surface of the substrate. First, the above-mentioned substrate coated with the polyamic acid liquid is heated at 100° C. for about 2 minutes for pre-curing, and then heated at 230° C. for about 1 h for main curing to obtain a polyimide alignment film.

[0043] IR(KBr): 3260-3270cm -1

[0044] In the same way, it is known that the amide group and carboxyl group of polyamic acid undergo a cyclization reaction to form polyimide.

Embodiment 3

[0046] Under the protection of nitrogen at room temperature, 21g of p-bis(4-acetylbutyl)pyromellitic dianhydride and 7.8g of p-diaminobiphenyl were mixed and stirred for 24h in 200ml of dry NMP to obtain the following repeating unit Polyamic acid liquid.

[0047]

[0048] IR(KBr): 1660cm -1 , 3260-3270cm -1 , 1720cm -1

[0049] Then the polyamic acid liquid obtained above is coated on the surface of the substrate. First, the above-mentioned substrate coated with the polyamic acid liquid is heated at 100° C. for about 2 minutes for pre-curing, and then heated at 230° C. for about 1 h for main curing to obtain a polyimide alignment film.

[0050] IR(KBr): 3260-3270cm -1

[0051] In the same way, it is known that the amide group and carboxyl group of polyamic acid undergo a cyclization reaction to form polyimide.

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Abstract

The invention provides polyimide, as well as a preparation method and an application thereof. The polyimide has a general formula (1) as shown in the specification, wherein Ar and Ar' can represent aryl, aromatic ether or aromatic ketone; and furthermore, the Ar and the Ar' at least comprise a side chain which contains one or more than two of N, O and F atoms at the terminal end and can form a hydrogen bond with hydroxyl. According to the polyimide disclosed by the invention, as the polyimide at least comprises the side chain which contains one or more than two of N, O, F and other atoms at the terminal end and can form the hydrogen bond with the hydroxyl, when the polyimide disclosed by the invention is utilized for forming an alignment film, the rubbing effect of rubbing cloth against the alignment film can be improved and the uniformity in liquid crystal orientation can be further improved.

Description

Technical field [0001] The present invention relates to a liquid crystal alignment material, in particular to a polyimide having at least one end containing one or more of N, O and F atoms and a side chain capable of forming a hydrogen bond with a hydroxyl group, and The preparation method and application of the polyimide. Background technique [0002] Polyimide is widely used in various fields as a material with excellent heat resistance, mechanical properties and chemical resistance. For example, in recent years, polyimide has been used to prepare alignment films in the field of liquid crystal displays. [0003] In the manufacturing process of the liquid crystal panel, a uniformly arranged alignment film is usually used to realize the alignment of the liquid crystal molecules, and the uniformity of the liquid crystal alignment directly affects the quality of the display. In the manufacturing process of the liquid crystal panel, a high-speed rotating rubbing roller is used to ru...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08L79/08C08J5/18C09K19/56G02F1/1337
Inventor 肖昂刘文智朱海波陈旭宋省勋
Owner BOE TECH GRP CO LTD
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