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Light stabilizer and preparation method and application thereof

A light stabilizer, esterification technology, applied in chemical instruments and methods, organic chemistry, liquid crystal materials, etc., can solve the problems of increased conductivity, insufficient stability of liquid crystal media, damage to stable electrical properties, etc., and achieve high specific resistance. value, good liquid crystal mutual solubility, good effect of rotational viscosity

Active Publication Date: 2020-11-06
河北八亿时空药业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, there have been reports of photoinitiators for liquid crystal media, however, for many practical applications of liquid crystal displays, the known liquid crystal media are not stable enough, especially their stability to UV and even to conventional backlight radiation leads to special effects on electrical Damage to properties, e.g. significant increase in electrical conductivity, etc.

Method used

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  • Light stabilizer and preparation method and application thereof
  • Light stabilizer and preparation method and application thereof
  • Light stabilizer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The present embodiment provides a kind of compound, and the structural formula of described compound is:

[0050]

[0051] This embodiment also provides the synthetic route for preparing compound BYLC-01 as follows:

[0052]

[0053] Specific steps are as follows:

[0054]Under nitrogen protection, add 51.6g 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl, 27.5g 2-cyclohexylmalonic acid, 3.7g 4-dimethylamine to the reaction flask basepyridine, 400ml of dichloromethane, stirred for 0.5 hours, controlled temperature -10°C-5°C, added dropwise a solution consisting of 66.0g of dicyclohexylcarbodiimide and 150ml of dichloromethane, and reacted at room temperature for 6 hours. After conventional post-treatment, chromatographic purification and n-hexane elution gave 61.3 g of light pink solid (compound BYLC-01), LC: 99.7%, yield: 82.8%.

[0055] The obtained BYLC-01 was analyzed by LC-MS, and the m / z of the product was 494.1 (M+).

[0056] Elemental analysis: C: 65.55, ...

Embodiment 2

[0058] The present embodiment provides a kind of compound, and the structural formula of described compound is:

[0059]

[0060] This embodiment also provides the synthetic route for preparing compound BYLC-02 as follows:

[0061]

[0062] Specific steps are as follows:

[0063] Under nitrogen protection, add 43.0g 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl, 26.7g 3-cyclohexylglutaric acid, 1.8g 4-dimethylamine to the reaction flask Basepyridine, 500ml of dichloromethane, stirred for 0.5 hours, controlled temperature -5°C-5°C, added dropwise a solution consisting of 31.5g of dicyclohexylcarbodiimide and 80ml of dichloromethane, and reacted at room temperature for 8 hours. After conventional post-treatment, chromatographic purification and n-hexane elution gave 57.6 g of a light pink solid (compound BYLC-02), LC: 99.7%, yield: 88.3%.

[0064] The obtained BYLC-02 was analyzed by LC-MS, and the m / z of the product was 522.1 (M+).

[0065] Elemental analysis: C: 66.63...

Embodiment 3

[0067] The present embodiment provides a kind of compound, and the structural formula of described compound is:

[0068]

[0069] This embodiment also provides its preparation method: using 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl and 4-cyclohexylpimelic acid as raw materials, the reaction steps are the same as those in Example 1. Example 2, synthesis (compound BYLC-03) 55.4g, LC: 99.6%, yield: 82.5%.

[0070] The obtained BYLC-03 was analyzed by LC-MS, and the m / z of the product was 550.1 (M+).

[0071] Elemental analysis: C: 67.60, H: 9.88, N: 5.09, O: 17.43.

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Abstract

The invention belongs to the field of light stabilizers and particularly relates to a light stabilizer and a preparation method and application thereof. The light stabilizer is a compound having a structure as shown in a general formula I which is described in the specification. The compound disclosed by the invention has good rotary viscosity and liquid crystal intersolubility, excellent low-temperature working effect and good thermal stability, chemical stability, optical stability and mechanical properties; and a liquid crystal composition containing the compound has a high specific resistance value, a low threshold voltage and a fast response speed, especially has good stability and stable high VHR for degradation under heat and UV exposure, and has an important application value.

Description

technical field [0001] The invention belongs to the field of light stabilizers, and in particular relates to a light stabilizer and its preparation method and application. Background technique [0002] Liquid crystal display (liquid crystal display) is a display that utilizes the photoelectric changes of liquid crystals. It has the advantages of small size, light weight, low power consumption and good display quality. Therefore, it has become the mainstream of flat-panel displays in recent years. In recent years, liquid crystal display devices have been Widely used in various electronic devices, such as smartphones, tablets, car navigators, TVs, etc. 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 falling time, high contrast, wide viewin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D211/94C09K19/58
CPCC07D211/94C09K19/588
Inventor 高立龙储士红田会强姜天孟苏学辉戴雄
Owner 河北八亿时空药业有限公司
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