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Soluble polyimide liquid crystal vertical alignment agent, prepration method and liquid crystal box prepared thereby

A soluble polyimide, vertical alignment technology, used in liquid crystal materials, chemical instruments and methods, nonlinear optics, etc., can solve the problems of narrow viewing angle, slow response time, low contrast, etc. , the effect of fast response time and simple molecular structure

Active Publication Date: 2010-06-02
长沙道尔顿电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid crystal cell prepared by it completely overcomes the inherent problems of slow response time, narrow viewing angle and low contrast in the traditional parallel alignment technology of liquid crystal displays.

Method used

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  • Soluble polyimide liquid crystal vertical alignment agent, prepration method and liquid crystal box prepared thereby
  • Soluble polyimide liquid crystal vertical alignment agent, prepration method and liquid crystal box prepared thereby
  • Soluble polyimide liquid crystal vertical alignment agent, prepration method and liquid crystal box prepared thereby

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1.1 Preparation of monomer specific structure diamine

[0038] a. Preparation of 4'-dodecyloxy-4-hydroxybiphenyl

[0039] Add 1 part of 4,4'-dihydroxybiphenyl and 1 part of potassium hydroxide into a three-necked flask with a stirrer, add 40 parts of methanol and stir at a temperature of about 70°C to dissolve completely, then add 1 part of bromo Add dodecane into the reactor, stir and react for about 24 hours, stop the reaction, cool to about 15°C and filter, pour the filtrate into distilled water about 4 times its volume for precipitation, and suction filter after sufficient precipitation, the obtained white solid is first Washing with dilute hydrochloric acid with a weight concentration of 8%, then repeatedly washing with distilled water for 3 times, drying for 24 hours, and recrystallizing with ethanol, the obtained product is the primary product for preparing diamine with a specific monomer structure;

[0040] b. Preparation of 4-dodecyloxybiphenol-3', 5'-dinitrob...

Embodiment 2

[0049] 2.1 Preparation of monomer specific structure diamine

[0050] a. Preparation of 4'-dodecyloxy-4-hydroxybenzene

[0051] Add 10 parts of 4,4'-dihydroxybenzene and 15 parts of potassium hydroxide into a three-necked flask with a stirrer, add 80 parts of methanol and stir at a temperature of about 50°C to dissolve completely, then add 10 parts of decabromide Add dioxane into the reactor, stir and react for about 36 hours, stop the reaction, cool to about 25°C and filter, pour the filtrate into distilled water about 5 times its volume for precipitation, and carry out suction filtration after sufficient precipitation, the obtained white solid is first used Washing with dilute hydrochloric acid with a weight concentration of 5%, then repeatedly washing with distilled water for 3 times, drying for 24 hours, and recrystallizing with ethanol, the obtained product is the primary product for preparing diamine with a specific monomer structure;

[0052] b. Preparation of 4-dodecy...

Embodiment 3

[0061] 3.1 Preparation of monomer specific structure diamine

[0062] a. Preparation of 4'-octyloxy-4-hydroxybiphenyl

[0063] Add 5 parts of 4,4'-dihydroxybiphenyl and 8 parts of potassium hydroxide into a three-necked flask with a stirrer, add 80 parts of methanol and stir at a temperature of about 60°C to dissolve completely, then add 5 parts of bromo Add n-octane into the reactor, stir and react for about 30 hours, stop the reaction, cool to about 20°C and filter, pour the filtrate into distilled water about 6 times its volume for precipitation, and suction filter after sufficient precipitation, the obtained white solid is first Washing with dilute hydrochloric acid with a weight concentration of 4%, then repeatedly washing with distilled water for 3 times, drying for 36 hours, and recrystallizing with ethanol, the obtained product is the primary product for preparing diamine with a specific monomer structure;

[0064] b. Preparation of 4-octyloxybiphenol-3', 5'-dinitrobe...

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Abstract

The invention discloses a polyimide liquid crystal vertical alignment agent, a prepration method and a liquid crystal box prepared thereby. The liquid crystal vertical alignment agent is prepared by dissolving soluble polyimide which accounts for 2.5-5% of the weight of the alignment agent into an organic solvent, the soluble polyimide is prepared by leading 1-50 parts by weight of tetracarboxylic dianhydride, 1-50 parts by weight of diamine with a special structure, 1-50 parts by weight of diamine and 40-80 parts by weight of organic solvent to react under the protection of nitrogen and at the temperature of 160-180 DEG C for 5-12 hours, and the diamine with the special structure is prepared by leading HO-B-OH, a catalyst, the organic solvent, halogenated hydrocarbon X-R and dinitro-substituted benzoyl chloride to carry out three-step reaction. The polyimide of a liquid crystal vertical alignment film formed by using the liquid crystal vertical alignment agent disclosed by the invention is soluble, a pretitle angle of the liquid crystal box prepared by spin-coating the polyimide liquid crystal vertical alignment agent is close to 90 degrees, and a liquid crystal display prepared thereby has excellent performances of fast response, wide viewing angle, high contrast degree and the like.

Description

Technical field: [0001] The invention relates to liquid crystal display technology in the electronics industry, in particular to a technology of a soluble polyimide liquid crystal vertical alignment agent used for preparing a liquid crystal box. Background technique: [0002] Polyimide is widely used in high-tech fields such as microelectronics and optoelectronics because of its excellent heat resistance, mechanical properties and electrical properties. However, due to the rigidity of its molecular chain, it is insoluble and infusible after it is completely imidized, which brings certain difficulties to its processing. Therefore, during the processing of polyimide, it is generally first to form a polyamic acid intermediate, and then to imidize it at high temperature. But this has brought some other problems to its processing, such as the instability of polyamic acid storage, and the high temperature (250-300°C) in the imidization process increases the substrate damage in th...

Claims

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Application Information

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IPC IPC(8): C09K19/56C08G73/10G02F1/1337
Inventor 汪映寒房玉庆
Owner 长沙道尔顿电子材料有限公司
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