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A novel liquid crystal vertical alignment agent and its preparation method and application

A technology of vertical alignment and alignment agent, applied in the field of self-alignment additives and their preparation, can solve the problems of increased production cost, application limitation, long time consumption, etc.

Active Publication Date: 2020-12-18
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 novel liquid crystal vertical alignment agent and its preparation method and application
  • A novel liquid crystal vertical alignment agent and its preparation method and application
  • A novel liquid crystal vertical alignment agent and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]The structural formula of the vertical alignment agent is:

[0043]

[0044]The synthetic route to prepare compound BYLC-01 is as follows:

[0045]

[0046]Specific steps are as follows:

[0047](1) Synthesis of compound BYLC-01-1:

[0048]Add 20g to the reaction flask(0.073mol), 0.8g 4-(dimethylamino)-pyridine, add 300ml of dichloromethane to dissolve it; control the temperature at 10-15℃ and add 13ml of pyridine dropwise; cool the reaction solution, control the temperature at 0-5℃, and slowly drop Add 6.3ml of methanesulfonyl chloride (0.081mol); stir for 10h. Add 400 ml of 2M hydrochloric acid aqueous solution for acidification, perform conventional post-treatment, and recrystallize from acetonitrile to obtain 24.3 g of colorless crystals (compound BYLC-01-1, 0.069 mol), HPLC: 99.8%, yield: 94.5%.

[0049](2) Synthesis of compound BYLC-01-2:

[0050]Under the protection of nitrogen, 24.3 g of compound BYLC-01-1 (0.069 mol) and 61.6 g of potassium thioacetate were added to the reaction flask, disso...

Embodiment 2

[0056]The structural formula of the vertical alignment agent is:

[0057]

[0058]The synthetic route to prepare compound BYLC-02 is as follows:

[0059]

[0060]Specific steps are as follows:

[0061](1) Synthesis of compound BYLC-02-1:

[0062]Add 10g to the reaction flask(0.034mol), 0.4g 4-(dimethylamino)-pyridine, add 150ml of dichloromethane to dissolve it; control the temperature at 10-15℃ and add 7ml pyridine dropwise; cool the reaction solution, control the temperature at 0-5℃, and slowly drop Add 3.2ml of methanesulfonyl chloride (0.039mol); stir for 10h. Add 200ml of 2M hydrochloric acid aqueous solution for acidification, perform conventional post-treatment, and recrystallize from acetonitrile to obtain 12.1g of colorless crystals (compound BYLC-02-1, 0.031mol), HPLC: 99.7%, yield: 93.2%.

[0063](2) Synthesis of compound BYLC-02-2:

[0064]Under the protection of nitrogen, 12.1g of compound BYLC-02-1 (0.031mol) and 30.5g of potassium thioacetate were added to the reaction flask, dissolved in 40...

Embodiment 3

[0070]According to the technical solutions of Embodiment 1 and Embodiment 2, the following liquid crystal compounds can be synthesized by simply replacing the corresponding raw materials without changing any substantial operations:

[0071]

[0072]

[0073]In the above formulas, p1 represents 1, 2, 3, or 4; n1 represents 0, 1, 2, 3, 4, or 5.

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Abstract

The invention relates to a novel liquid crystal vertical alignment agent. The novel liquid crystal vertical alignment agent has a structure shown in a general formula I. The invention simultaneously relates to a preparation method and application of the alignment agent. According to the alignment agent, through interaction between -SH and the substrate surface, vertical orientation of liquid crystal molecules is achieved under the situation of not containing a PI oriented film. The novel liquid crystal vertical alignment agent is low in coat and stable in performance, can be widely used in thefield 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-aligning additive and a preparation method thereof, which realize the vertical alignment of a liquid crystal medium 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 smart phones, tablet computers, car navigators, televisions, and so on. 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 received more and more attention due to its fast fall time, high contrast, wide viewing angle and high-quality images.[0003]In a conventional VA display, after the glass substrate is made into an electrode, its surface needs to be coated with a layer of polyimide (PI)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/56C09K19/44
CPCC09K19/44C09K19/56
Inventor 王迎运张嫣然姜天孟储士红田会强高立龙王新颖陈海光戴雄
Owner BEIJING BAYI SPACE LCD MATERIALS TECH
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