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Novel liquid crystal vertical alignment agent and preparation method and application thereof

A vertical alignment, liquid crystal technology, applied in liquid crystal materials, chemical instruments and methods, optics, etc., can solve the problems of cumbersome coating process of PI alignment film, weak anchoring ability of liquid crystal molecules, affecting the performance of liquid crystal medium, etc., and achieve low temperature work effect. Excellent, excellent performance, high optical anisotropy effect

Active Publication Date: 2019-11-01
BEIJING BAYI SPACE LCD MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has obvious shortcomings: the coating process of PI alignment film is cumbersome and takes a long time, which greatly increases the production cost
Rubbing alignment type PI alignment film will generate dust and static electricity during the rubbing process, which will affect the performance of the liquid crystal medium, and even damage the liquid crystal display element during the rubbing process; although the photo alignment type PI alignment material avoids the above defects, its effect on the liquid crystal The molecular anchoring ability is weak, and its application is also limited by the constraints of its own material properties.

Method used

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  • Novel liquid crystal vertical alignment agent and preparation method and application thereof
  • Novel liquid crystal vertical alignment agent and preparation method and application thereof
  • Novel liquid crystal vertical alignment agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] The structural formula of the vertical alignment agent is:

[0077]

[0078] The synthetic route for preparing compound BYLC-01 is as follows:

[0079]

[0080] Specific steps are as follows:

[0081] (1) Synthesis of compound BYLC-01-1:

[0082] Under nitrogen protection, add 33.0g compound 4-methyl ether phenylboronic acid, 42.2g 1-bromo-4-(cyclopropylmethylene)benzene, 200ml N,N-dimethylformamide, 100ml deionized Water, 41.4g anhydrous potassium carbonate, 0.5g tetrakistriphenylphosphine palladium, heated to 70°C for 3 hours. After conventional post-processing, chromatographic purification, eluting with n-hexane, and recrystallization from ethanol gave 43.2 g of a white solid (compound BYLC-01-1), GC: 99.6%, yield: 85.8%.

[0083] (2) Synthesis of compound BYLC-01:

[0084] Add 43.2g of compound BYLC-01-1, 400ml of dichloromethane to the reaction flask, cool down to -10°C, and add 220ml (0.22mol) of 1M boron tribromide in hexane dropwise at -10 to 0°C solu...

Embodiment 2

[0088] According to the technical scheme of Example 1, the following compounds can be synthesized by simply replacing the corresponding raw materials without changing any substantive operations:

[0089]

[0090]

[0091] Among them, p 1 means 0, 1 or 2; n means 0, 1, 2, 3, 4 or 5.

Embodiment 3

[0093] The structural formula of the liquid crystal compound is:

[0094]

[0095] The synthetic route for preparing compound BYLC-02 is as follows:

[0096]

[0097] Specific steps are as follows:

[0098] (1) Synthesis of compound BYLC-02-1:

[0099] Add 40.2g of p-bromoanisole and 450ml of tetrahydrofuran to the reaction flask, add 0.26mol of n-butyl lithium in n-hexane solution dropwise at -70~-80℃, and react for 1 hour under temperature control, and control the temperature at -70~- A solution consisting of 28.8g of 4-(cyclopropylmethylene)cyclohexanone and 90ml of tetrahydrofuran was added dropwise at 80°C, then naturally warmed to -30°C, 500ml of 2M hydrochloric acid aqueous solution was added for acidification, and conventional post-treatment was performed to obtain shallow Yellow liquid (compound BYLC-02-1) 49.6g, GC: 95.6% (cis + trans), yield: 95.4%.

[0100] (2) Synthesis of compound BYLC-02-2:

[0101] Add 49.6g of compound BYLC-02-1, 0.65g of p-toluenesu...

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Abstract

The invention relates to a liquid crystal vertical alignment agent and a preparation method and application thereof. The liquid crystal vertical alignment agent has a structure shown as a formula I. Through interaction between -OH and a substrate surface, the alignment agent achieves vertical alignment of liquid crystal molecules without the presence of PI alignment film. The alignment agent is cheap and stable in performance, can be widely applied in the field of liquid crystal display and has important application value.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal materials, and relates to a liquid crystal vertical alignment agent and a preparation method and application thereof. The liquid crystal vertical alignment agent achieves vertical alignment of liquid crystal media without a conventional polyimide alignment layer. Background technique [0002] In recent years, liquid crystal display devices have been widely used in various electronic devices such as smartphones, tablet computers, car navigation systems, televisions, and the like. Representative liquid crystal display modes include twisted nematic (TN) type, super twisted nematic (STN) type, in-plane switching (IPS) type, fringe field switching (FFS) type and vertical alignment (VA) type. Among them, the VA mode has attracted more and more attention due to its fast fall time, high contrast, wide viewing angle, and high-quality images. [0003] In conventional VA displays, after the glass su...

Claims

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Application Information

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IPC IPC(8): C09K19/56G02F1/1337
CPCC09K19/56G02F1/1337
Inventor 高立龙姜天孟田会强储士红陈海光王新颖苏学辉戴雄
Owner BEIJING BAYI SPACE LCD MATERIALS TECH
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