Method for purifying liquid crystal material

A liquid crystal material and electric field technology, applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problem of not being able to increase the resistivity of liquid crystal materials stably and effectively, and achieve the effect of small influence, good reproducibility, and low loss of liquid crystal

Inactive Publication Date: 2008-07-02
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for purifying liquid crystal materials that can stably and effectively improve the resistivity of liquid crystal materials in order to overcome the disadvantage that the existing methods for purifying liquid crystal materials cannot stably and effectively improve the resistivity of liquid crystal materials

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  • Method for purifying liquid crystal material

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Embodiment 1

[0021] This example is used to illustrate the method for purifying liquid crystal material provided by the present invention.

[0022] The initial resistivity was reduced to 3.0×10 by the pressurization method using a vacuum pump 11 2 liters of 4-(trans-4'-propylcyclohexyl) cyanide monomer liquid crystal in ohm cm was injected into an indium tin oxide conductive glass cell (CSG) with a length of 1.5 meters, a width of 0.5 meters and a height of 1000 microns Produced by the company), apply a DC voltage of 200 volts on the two pieces of conductive glass of the conductive glass box, control the injection speed of the monomer liquid crystal to 1 liter / 6 hours, and receive the purified liquid crystal material at the outlet of the conductive glass box , to obtain a resistivity of 1.99 liters of 6.3×10 13 ohm-cm liquid crystal material.

Embodiment 2

[0024] This example is used to illustrate the method for purifying liquid crystal material provided by the present invention.

[0025] The initial resistivity was reduced to 4.0×10 by the pressurization method using a vacuum pump 12 2 liters of 4-(trans-4'-propylcyclohexyl) cyanide monomer liquid crystal in ohm cm was injected into an indium tin oxide conductive glass cell (CSG) with a length of 1.5 meters, a width of 0.5 meters and a height of 1000 microns (manufactured by the company), apply a DC voltage of 280 volts on the two pieces of conductive glass of the conductive glass box, control the injection speed of the monomer liquid crystal to 0.5 liters / 6 hours, and receive the purified liquid crystal material at the outlet of the conductive glass box , to obtain a resistivity of 1.99 liters of 6.8×10 13 ohm-cm liquid crystal material.

Embodiment 3

[0027] This example is used to illustrate the method for purifying liquid crystal material provided by the present invention.

[0028] The initial resistivity was reduced to 4.0×10 by the pressurization method using a vacuum pump 12 2 liters of 4-(trans-4'-propylcyclohexyl) cyanide monomer liquid crystal in ohm cm was injected into an indium tin oxide conductive glass cell (CSG) with a length of 1.5 meters, a width of 0.5 meters and a height of 1000 microns (manufactured by the company), apply a DC voltage of 180 volts on the two pieces of conductive glass in the conductive glass box, control the injection speed of the monomer liquid crystal to 0.8 liters / 6 hours, and receive the purified liquid crystal material at the outlet of the conductive glass box , to obtain a resistivity of 1.99 liters of 6.4×10 13 ohm-cm liquid crystal material.

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Abstract

A method for purifying liquid crystal material comprises the steps of settling a liquid crystal material loaded in a semi-sealed conductive box in an electric field environment, and extracting the liquid crystal material in the electric field environment. By adopting electric field action, the method for purifying the liquid crystal material can improve the resistivity of liquid crystal material to above 6*10<13> omega*cm; on the other hand, no solvent is needed so no pollution is caused to environment. Additionally, the electric field environment is typically achieved in the semi-sealed conductive glass box, thus achieving less influence by the environment and the operation, no secondary contamination on the liquid crystal, good reproducibility, and stable production of high-resistivity liquid crystal material. Additionally, the invention also has the advantages of high yield and low liquid crystal loss.

Description

technical field [0001] The invention relates to a method for purifying liquid crystal material. Background technique [0002] Liquid crystal display devices have been widely used in various display terminals due to their advantages of small size, light weight, low power consumption, and low driving voltage. Liquid crystal, the key material in liquid crystal display devices, has a great influence on the performance of all aspects of the display. Liquid crystals must not only have high purity, but also high resistivity, which generally must reach 10 11 More than ohm cm, especially for high-end STN, TFT and other display types, the requirements for resistivity are higher, generally need to reach 10 13 ohm cm or more. [0003] There are many factors that affect the purity of liquid crystals, such as solvents contained in monomeric liquid crystals or mixed liquid crystals, unreacted substances, various reaction by-products, moisture, various anions and cations, etc., all of wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/00
Inventor 刘冬江林宫清
Owner BYD CO LTD
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