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Liquid crystal compound and preparation method and application thereof

A liquid crystal compound and product technology, applied in the field of liquid crystal compound and its preparation, can solve the problems of insufficient charge retention rate, poor image quality, and insufficient fast response of TFT-LCD, etc.

Active Publication Date: 2013-01-23
BEIJING BAYI SPACE LCD MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of the two-terminal active mode is relatively simple, but the image quality is worse than that of the three-terminal active mode, and it is almost eliminated at present.
However, due to the limitations of the liquid crystal material itself, TFT-LCD still has many defects such as insufficient response, insufficient voltage, and insufficient charge retention rate.

Method used

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  • Liquid crystal compound and preparation method and application thereof
  • Liquid crystal compound and preparation method and application thereof
  • Liquid crystal compound and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Embodiment 1 The synthetic method of 1,1-difluorotetrahydronaphthalene liquid crystal compound

[0078] 1.

[0079]

[0080] In a 500mL clean and dry three-neck flask, add 3.1g (0.13mol) magnesium chips, 10mLTHF and a small amount of bromopropane and stir to initiate the reaction, then add the remaining bromopropane (a total of 14.8g, 0.12mol) and 250mL THF dropwise at a temperature of about 25°C The formed solution was reacted at a temperature of about 25°C for 1.5 hours; the temperature was controlled at -5°C to 0°C, and a solution composed of 0.1mol p-bromophenylacetaldehyde and 50mL TFT was added dropwise, and the temperature was controlled for 1 hour to react. Slowly pour the reaction solution into a beaker filled with crushed ice and 50mL concentrated hydrochloric acid, acidify and hydrolyze, separate the liquid after stirring, extract the water phase with (50mL×2) toluene twice, combine the organic phase, and use (50mL×2) toluene for the organic phase 2) Wash...

Embodiment 2

[0100] 1. Synthesis

[0101] Using THF as a solvent, replacing bromopropane with bromoethane, the molar ratio of p-bromophenylacetaldehyde, bromoethane and magnesium chips is 1:1:1, and the temperature is controlled at -5°C to 0°C for 1 hour to obtain the compound Yield 88%.

[0102] 2. Synthesis

[0103] Under nitrogen protection, dichloromethane was used as solvent, pyridine, triphenylphosphine, React with bromine according to 1:1:1:1 at room temperature for 8 hours to obtain the compound The yield is 85%.

[0104] 3. Synthesis

[0105] With absolute ethanol as solvent, the compound Sodium metal and diethyl malonate 1:1:1 react at a temperature of 50°C-60°C for 1 hour to obtain the compound The yield is 83%.

[0106] 4. Synthesis

[0107] The compound obtained in step 3 and polyphosphoric acid were reacted for 2 hours at a ratio of 1:2.5 to obtain the compound The yield is 82%.

[0108] 5. Synthesis

[0109] Using dichloromethane as a solvent, the ...

Embodiment 3

[0116] 1. Synthesis

[0117] Use THF as a solvent, use bromopentane instead of bromopropane, the molar ratio of p-bromophenylacetaldehyde, bromoethane and magnesium chips is 1:2:2, and the temperature is controlled at -5°C to 0°C for 2 hours to obtain the compound The yield is 85%.

[0118] 2. Synthesis

[0119] Under the protection of nitrogen, dichloromethane is used as a solvent, pyridine, triphenylphosphine, the compound obtained in step (1) and bromine are treated according to the ratio of 1:5:5:5 at room temperature for 9 hours to obtain the compound The yield is 85%.

[0120] 3. Synthesis

[0121] Use absolute ethanol as a solvent, diethyl malonate, sodium metal and the compound obtained in step (2) in a molar ratio of 1:1.5:1.5 and react at a temperature of 50°C-60°C for 1.5 hours to obtain the compound The yield is 80%.

[0122] 4. Synthesis

[0123] The compound obtained in step 3 reacted with polyphosphoric acid 1:3 for 2.5 hours to obtain the compo...

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PUM

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Abstract

The invention discloses a liquid crystal compound and a preparation method and application thereof. The liquid crystal compound has the structural formula shown in the specifications; and the compound is stable in structure and property, and has the characteristics of high intersolubility, high ultraviolet resistance property, high charge retention rate, and high dielectric anisotropy. When the liquid crystal compound is applied to a liquid crystal composition, threshold voltage can be reduced, the delta n value of a system can be adjusted, and the comprehensive performance of the liquid crystal composition can be improved.

Description

technical field [0001] The invention relates to the field of liquid crystal materials. Specifically, it relates to a liquid crystal compound and its preparation method and application. Background technique [0002] In 1888, Austrian botanist Friedrich Reinitzer discovered liquid crystals. Since then, the research and application of liquid crystals have developed rapidly, especially after W. Helfrich and M. Schadt discovered the field effect of twisted nematic liquid crystals in 1971, which made liquid crystal display technology possible. accomplish. [0003] There are two drive methods for liquid crystal displays: passive matrix [also known as passive matrix (Passive Matrix, PM) or simple matrix] and active matrix [also known as active matrix (Active Matrix, AM)]. Active matrix liquid crystal displays can be divided into two types according to the type of active devices: two-terminal active matrix and three-terminal active matrix. The process of the two-terminal active mo...

Claims

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Application Information

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IPC IPC(8): C09K19/32C07C43/225C07C41/30C07C25/22C07C17/263G02F1/1333
Inventor 杭德余梁现丽孙丽丽姜天孟田会强陈海光高立龙班全志
Owner BEIJING BAYI SPACE LCD MATERIALS TECH
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