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A kind of self-alignment additive and its preparation method and application

An additive and self-aligning technology, applied in chemical instruments and methods, instruments, organic chemistry, etc., can solve problems such as time-consuming, weak anchoring ability of liquid crystal molecules, and application limitations.

Active Publication Date: 2020-11-17
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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  • A kind of self-alignment additive and its preparation method and application
  • A kind of self-alignment additive and its preparation method and application
  • A kind of self-alignment additive and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Synthesis of Embodiment 1 BYLC-01

[0082] The structural formula of the liquid crystal compound is:

[0083]

[0084] The synthetic route for preparing compound BYLC-01 is as follows:

[0085]

[0086] Specific steps are as follows:

[0087] (1) Synthesis of compound BYLC-01-1:

[0088] Under the protection of nitrogen, add 40.0g of p-bromoanisole and 280ml of tetrahydrofuran to the reaction flask, and add 0.26mol of n-butyllithium n-hexane solution dropwise at -70~-80°C under temperature control.

[0089] 32.0 g of trimethyl borate was added dropwise at -60 to -70°C under temperature control, and then returned to -30°C naturally.

[0090] Add 400 ml of 2M hydrochloric acid aqueous solution for acidification, perform conventional post-treatment, and recrystallize petroleum ether to obtain 28.3 g of light yellow solid (compound BYLC-01-1), HPLC: 99.7%, yield: 85.7%.

[0091] (2) Synthesis of compound BYLC-01-2:

[0092] Under nitrogen protection, 28.3g of com...

Embodiment 2

[0098] 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:

[0099]

[0100]

[0101] R represents a hydrogen atom or an alkyl group with 1-5 carbon atoms, wherein, one or more non-adjacent CH 2 The radicals can be replaced independently of each other by -O- not directly connected to each other; n represents 0, 1, 2, 3, 4 or 5.

Embodiment 3

[0102] Synthesis of Embodiment 3 BYLC-02

[0103] The structural formula of the liquid crystal compound is:

[0104]

[0105] The synthetic route for preparing compound BYLC-02 is as follows:

[0106]

[0107] Specific steps are as follows:

[0108] (1) Synthesis of compound BYLC-02-1:

[0109] Add 50.0 g of p-bromoanisole and 450 ml of tetrahydrofuran to the reaction flask, add dropwise 0.315 mol of n-butyl lithium in n-hexane solution at -70 to -80°C under temperature control, and react for 1 hour under temperature control;

[0110] A solution consisting of 46.0 g of 4-(3-ethylcyclopentyl) cyclohexanone and 150 ml of tetrahydrofuran was added dropwise at a temperature of -70 to -80°C, and then the temperature was naturally returned to -30°C.

[0111] Add 500ml of 2M hydrochloric acid aqueous solution for acidification and conventional post-treatment to obtain 76.2g of light yellow liquid (compound BYLC-02-1), GC: 93.8% (cis + trans), yield: 96.4%.

[0112](2) Synth...

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Abstract

The invention relates to a self-alignment additive and a preparation method and application thereof. The additive is a compound shown as a general structure I. Through interaction between -OH and a substrate surface, the additive achieves vertical alignment of liquid crystal molecules in a situation of no PI alignment film exists. The additive 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 self-alignment additive and its preparation method and application. 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 substrate is made into electrodes, its surface needs to be coated with a layer of polyimide (PI) alignment film to achieve vertical alignment of liquid crystal molecules. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C13/10C09K19/56G02F1/1333
CPCC09K19/56G02F1/1337
Inventor 高立龙姜天孟储士红田会强陈海光王新颖苏学辉戴雄
Owner BEIJING BAYI SPACE LCD MATERIALS TECH
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