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Fluorine-containing liquid crystal containing difluoromethoxy bridge and polyfluorobiphenyl group and composition thereof

A technology of fluorobiphenyl and liquid crystal compounds, which is applied in the field of TFT liquid crystal displays, and can solve the problems of suppressing viscosity rise and difficulty

Active Publication Date: 2018-10-02
FUJIAN YONGJING TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is very difficult to control the change of Δε while suppressing the increase of viscosity and the decrease of liquid crystal phase temperature.

Method used

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  • Fluorine-containing liquid crystal containing difluoromethoxy bridge and polyfluorobiphenyl group and composition thereof
  • Fluorine-containing liquid crystal containing difluoromethoxy bridge and polyfluorobiphenyl group and composition thereof
  • Fluorine-containing liquid crystal containing difluoromethoxy bridge and polyfluorobiphenyl group and composition thereof

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0026] Synthesis of difluoro-[4-n-propyl-2,6-difluorophenyl]-(3,5,3',4',5'-pentafluorobiphenyloxy)methane series (C-c)

[0027] 1) Synthesis of C3

[0028] Magnesium (2.5g) and 20mL dry tetrahydrofuran were added to a 250mL three-neck flask under nitrogen protection, and magnetically stirred, then 3,5-difluorobromobenzene (19.3g) was dissolved in 70mL dry tetrahydrofuran, and added to 100mL In the normal pressure dropping funnel, drop a small amount (10mL) to activate the magnesium chips, heat up and reflux after 5 minutes, continue to add the remaining mixed solution dropwise, finish dropping in 40 minutes, continue the normal temperature reaction for 1.5 hours, add propionaldehyde ( 5.8g) and 60mL of diethyl ether, drop it over in 10 minutes, heat to reflux for 2 hours, cool down, and slowly add 250mL of saturated ammonium chloride solution (too fast will cause bumping), initially there will be precipitation, continue to drop the precipitation dissolve. The mixture was ext...

Embodiment 2

[0053] Positive polarity liquid crystal composition with dielectric constant anisotropy

[0054] Adopt the positive polarity liquid crystal composition of dielectric constant anisotropy of 15 liquid crystallization examples in the following table

[0055]

[0056] Results: Using the above 15 compounds, according to the weight ratio set in the text, mixed with the conventional mixing method to prepare the liquid crystal composition. The physical parameters of the composition are: clearing point, 92 ° C; Δn, (0.11, 20 ° C ); threshold voltage Vth, 1.40v; Δε, 8.5 (25°C.

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Abstract

The invention relates to a fluorine-containing liquid crystal compound containing a difluoromethoxy bridged bond and a polyfluorobiphenyl group, and a composition, a preparation method and an application of the compound, The fluorine-containing liquid crystal compound has a structural formula shown in the description.

Description

technical field [0001] The present invention is a novel fluorine-containing liquid crystal containing difluoromethoxyl CF2O bridge and polyfluorobiphenyl group in molecular structure and its composition. The composition formed by them and other liquid crystals can be used in TFT liquid crystal display. technical background [0002] Flat-panel liquid crystal displays are the mainstream of display screens on portable computers, marine aviation systems and televisions. These applications have to meet high demands in terms of response time and image contrast. In terms of the physical properties of the liquid crystal material, considering the withstand voltage of the IC, a low driving voltage is required, that is, a liquid crystal and a liquid crystal composition with a low threshold voltage are required. A general practice is to use a liquid crystal compound with a larger dielectric constant anisotropy Δε, which can lower the threshold voltage Vth. Therefore, polar liquid crys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/20C09K19/44C07C41/30C07C43/225
CPCC07C41/30C09K19/20C09K19/44C07C43/225
Inventor 闻建勋王建新杜宏军肖智勇邱绿洲
Owner FUJIAN YONGJING TECH CO LTD
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