Self-alignment additive for liquid crystal medium, and preparation method and application of self-alignment additive

A liquid crystal medium, self-alignment 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 Excellent effect, excellent performance, high optical anisotropy effect

Active Publication Date: 2019-09-13
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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  • Self-alignment additive for liquid crystal medium, and preparation method and application of self-alignment additive
  • Self-alignment additive for liquid crystal medium, and preparation method and application of self-alignment additive
  • Self-alignment additive for liquid crystal medium, and preparation method and application of self-alignment additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] The structural formula of the liquid crystal compound is:

[0087]

[0088] The synthetic route for preparing compound BYLC-01 is as follows:

[0089]

[0090] Specific steps are as follows:

[0091] (1) Synthesis of compound BYLC-01-1:

[0092] Under nitrogen protection, add 35g (0.287mol), 150ml tetrahydrofuran, add dropwise 0.37mol n-butyllithium n-hexane solution at -70~-80°C under temperature control, react with temperature control for 1 hour after dropping, then add 46.6g boric acid dropwise under temperature control at -60~-70°C Trimethyl ester (0.44mol), and then naturally warmed to -30°C. Add 400ml of 2M hydrochloric acid aqueous solution for acidification, perform conventional post-treatment, and recrystallize from petroleum ether to obtain 43.0g of light yellow solid (compound BYLC-01-1, 0.259mol), HPLC: 99.7%, yield: 90.2%.

[0093] (2) Synthesis of compound BYLC-01-2:

[0094] Under the protection of nitrogen, add 43.0g compound BYLC-01-1 (0.259...

Embodiment 3

[0104] The structural formula of the liquid crystal compound is:

[0105]

[0106] The synthetic route for preparing compound BYLC-02 is as follows:

[0107]

[0108] Specific steps are as follows:

[0109] (1) Synthesis of compound BYLC-02-1:

[0110] Add 35g to the reaction bottle (0.287mol), 450ml tetrahydrofuran, add dropwise 0.315mol n-butyllithium n-hexane solution at -70~-80℃ under temperature control, react for 1 hour under temperature control after dropping, add 59.7g dropwise under temperature control at -70~-80℃ and 100ml of tetrahydrofuran, then naturally warmed to -30°C, added 500ml of 2M hydrochloric acid aqueous solution for acidification, performed conventional post-treatment, and spin-dried the solvent to obtain 88.8g (0.269mol) of light yellow liquid (compound BYLC-02-1) . GC: 91.3% (cis+trans), yield: 93.7%.

[0111] (2) Synthesis of compound BYLC-02-2:

[0112] Add 88.8g of compound BYLC-02-1 (0.269mol), 0.84g of p-toluenesulfonic acid, 500ml of...

Embodiment 4

[0118] According to the technical scheme of Example 3, the following compounds can be synthesized by simply replacing the corresponding raw materials without changing any substantive operations:

[0119]

[0120] R represents an alkyl or alkoxy group having 1-5 carbon atoms; n represents 0, 1, 2, 3, 4 or 5.

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Abstract

The invention relates to a self-alignment additive for a liquid crystal medium, and a preparation method and application of the self-alignment additive. The self-alignment additive is a compound witha structure represented by the following general formula I. In the general formula I, R represents alkyl, alkoxy, alkenyl or alkenyloxy with 1-10 carbon atoms; the ring A represents 1,4-phenylene, 1,4-cyclohexylidene, 1,4-cyclohexenylene, or 1,4-phenylene with 1-4 hydrogen atoms substituted by fluorine; the ring B represents 1,4-phenylene, 1,4-cyclohexylidene, or 1,4-phenylene with 1-4 hydrogen atoms substituted by fluorine; l and m separately represent 0, 1 or 2, and 0<l+m<=3; and n represents 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10. The self-matching additive realizes vertical orientation of liquidcrystal molecules under the condition that no polyimide (PI) alignment layer is contained. In addition, the compound is low in price and stable in performance, can be widely applied to the field of liquid crystal display, and has an 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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IPC IPC(8): C09K19/56C07D333/16C07D333/32G02F1/1337
CPCC07D333/16C07D333/32C09K19/56G02F1/1337
Inventor 王迎运姜天孟储士红王新颖高立龙陈海光戴雄
Owner BEIJING BAYI SPACE LCD MATERIALS TECH
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