Preparation method of polyimide liquid crystal alignment agent and liquid crystal box thereof

A technology of liquid crystal alignment agent and polyimide, which is applied in liquid crystal materials, chemical instruments and methods, instruments, etc., can solve problems such as afterimages in liquid crystal screens, achieve high pre-tilt angles, increase pre-tilt angles, and reduce costs

Inactive Publication Date: 2013-04-10
ZHUHAI CAIZHU IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a voltage is applied to the liquid crystal display element, the generated ionic charge will be absorbed by the alignment film, and the charge is difficult to detach from the alignment film, resulting in afterimage on the liquid crystal screen

Method used

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  • Preparation method of polyimide liquid crystal alignment agent and liquid crystal box thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 4,4'-diaminodiphenyl ether and 3,5-diaminobenzoic acid cholesteryl ester and mix uniformly. The 3,5-diaminobenzoic acid cholesteryl ester accounts for 10% of the total amine molar content. The initial ratio of amine anhydride is Control between 0.95-1.1, add 3g of diamine mixture to 40g of solvent under the protection of nitrogen, add 8g of soluble polyimide, and then add 2.91g of pyromellitic dianhydride in 10 steps, and add 2 After reacting at 40°C for 4 hours, add 20 g of solvent, 25 g of leveling agent, and 0.03 g of coupling agent to obtain a polyimide liquid crystal aligning agent solution and make it into a liquid crystal cell.

Embodiment 2

[0032] Add 4,4'-diaminodiphenyl ether and 3,5-diaminobenzoic acid cholesteryl ester and mix uniformly. The 3,5-diaminobenzoic acid cholesteryl ester accounts for 10% of the total amine molar content. The initial ratio of amine anhydride is Control between 0.95-1.1, add 3.22g of diamine mixture to 40g of solvent under the protection of nitrogen, add 8g of soluble polyimide, then add 2.78g of cyclobutanetetracarboxylic dianhydride in 10 times, After reacting at 20-40°C for 4 hours, add 20 g of solvent, 25 g of leveling agent, and 0.03 g of coupling agent to obtain a polyimide liquid crystal aligning agent solution and make it into a liquid crystal cell.

Embodiment 3

[0034] Add 4,4'-diaminodiphenyl ether and 3,5-diaminobenzoic acid cholesteryl ester and mix uniformly. The 3,5-diaminobenzoic acid cholesteryl ester accounts for 10% of the total amine molar content. The initial ratio of amine anhydride is Control between 0.95-1.1, add 3.22g of diamine mixture to 40g of solvent under the protection of nitrogen, add 12g of soluble polyimide, and then add 2.78g of cyclobutanetetracarboxylic dianhydride in several times, After reacting at 20-40°C for 4 hours, add 20 g of solvent, 25 g of leveling agent, and 0.06 g of coupling agent to obtain a polyimide liquid crystal aligning agent solution and make it into a liquid crystal cell.

[0035] The addition amount of the soluble polyimide in the above embodiment is the addition amount of the soluble polyimide solid, and it can be prepared as a solution before adding.

[0036] The performance results of the examples are shown in Table 1:

[0037] Table 1:

[0038]

[0039] It can be seen from the test results...

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Abstract

The invention discloses a preparation method of a polyimide liquid crystal alignment agent and a liquid crystal box thereof, which comprises the following steps: preparing soluble polyimide; adding a mixture of diamine and long-chain diamine into organic solvent in a nitrogen gas protective atmosphere, and then adding the prepared soluble polyimide; adding tetracarboxylic dianhydride multiple times, reacting at 20-40 DEG C for 3-5 hours, and then adding 20-30% of organic solvent, 10-40% of leveling agent and 0.1-1% of coupling agent, thus obtaining the polyimide liquid crystal alignment agent solution; and preparing the liquid crystal box from the alignment agent solution. According to the invention, the electric properties of a display device can be regulated by regulating the ratio of the soluble polyimide to polyamic acid; the long-chain diamine is used to provide a stable pretilt angle, so that the liquid crystal box disclosed by the invention has a high pretilt angle, a low residual direct current potential and a high voltage retention rate; and the reaction temperature of the synthesized alignment agent solution is biased towards room temperature or above, thus reducing the synthesis reaction time.

Description

【Technical Field】 [0001] The invention relates to a liquid crystal alignment agent and a preparation method of a liquid crystal cell, in particular to a polyimide liquid crystal alignment agent and a preparation method of the liquid crystal cell, belonging to the field of liquid crystal display preparation. 【Background technique】 [0002] To obtain a good display effect for a liquid crystal display, the liquid crystal molecules must have a good and stable alignment. Polyimide (PI) has excellent properties such as high temperature resistance, chemical corrosion resistance, stable orientation, and easy film formation, and is currently widely used in liquid crystal display orientation films. Generally, polyimide is insoluble and infusible. When in use, polyamic acid is coated on a glass substrate and heated to imidize it to form a polyimide film. After rubbing, a certain angle is formed, so that the liquid crystal molecules Directional. When a voltage is applied to the liquid crys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56C08G73/10G02F1/1337
Inventor 钱德伟
Owner ZHUHAI CAIZHU IND
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