Method for electric field to absorb and purify liquid crystal

An electric field and liquid crystal technology, applied in the field of physical chemistry, can solve the problems of difficult purification of high-resistivity liquid crystal materials, unsustainable and stable operation, and achieve high resistivity, strong stability, and improved resistivity.

Inactive Publication Date: 2010-06-30
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a method for the purification of liquid crystal materials by electric field adsorption, the purpose of which is to provide an effective and stable purification method for high-resistivity liquid crystal materials that can be continuously operated to solve the problems of the prior art Medium and high resistivity liquid crystal materials are difficult to purify and cannot be operated continuously and stably

Method used

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  • Method for electric field to absorb and purify liquid crystal

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1 (liquid crystal compound):

[0030] 7 grams of trans 4-(4-pentylcyclohexyl) fluorobenzene white solid was dissolved in 15ml of toluene, the test resistivity was 5.5×10 11Ω·cm (25°C), add to the middle area of ​​20ml electric field tank; add 15ml of pure toluene and 0.2 g of silicon oxide adsorbent to the cathode and anode tanks respectively; the distance between the two electrodes of the electric field is 35mm, and metal oxide film electrodes are used ; When the voltage was 8000V, kept for 90min, the measured solution resistivity was 5.2×10 13 Ω·cm (25°C). After evaporating toluene, the measured resistivity is 2.2×10 13 Ω·cm (25°C).

Embodiment 2

[0031] Embodiment 2 (liquid crystal compound):

[0032] 7 grams of trans 4-(4-pentylcyclohexyl) fluorobenzene white solid was dissolved in 15ml of toluene, the test resistivity was 5.5×10 11 Ω cm (25°C), add to the middle area of ​​20ml electric field tank; add 15ml of pure toluene and 0.1 gram of silicon oxide adsorbent to the cathode and anode tanks respectively; the distance between the two electrodes of the electric field is 35mm, and metal oxide film electrodes are used ; When the voltage was 10000V, kept for 60min, the measured solution resistivity was 3.5×10 13 Ω·cm (25°C). After distilling off the toluene, the measured resistivity was 9.2×10 12 Ω·cm (25°C).

Embodiment 3

[0033] Embodiment 3 (liquid crystal compound):

[0034] 6 grams of trans 4-(4-pentylcyclohexyl) fluorobenzene white solid was dissolved in 15ml of toluene, the test resistivity was 5.5×10 11 Ω cm (25°C), add to the middle area of ​​20ml electric field tank; add 15ml of petroleum ether (90-120) and 0.2 g of silicon oxide adsorbent to the cathode and anode tank respectively; the distance between the two electrodes of the electric field is 35mm, using Metal oxide thin film electrode; when the voltage is 5000V, keep it for 120min, and the measured solution resistivity is 6.8×10 13 Ω·cm (25°C). After distilling off the toluene, the measured resistivity was 3.5×10 13 Ω·cm (25°C).

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Abstract

The invention particularly relates to a method for an electric field to absorb and purify a liquid crystal. The method adopts an electric field absorbing and purifying device which is provided with the following three intervals: a cathode solvent chamber, an anode solvent chamber and a middle purifying chamber. Ion permeable membranes are respectively arranged between the cathode solvent chamber and the middle purifying chamber, and between the anode solvent chamber and the middle purifying chamber. A negative electrode is inserted in the cathode solvent chamber, and a positive electrode is inserted in the anode solvent chamber. When the device is applied for purification, liquid crystal material solution is arranged in the middle purifying chamber, absorbing agents and solvents are respectively arranged in the cathode solvent chamber and the anode solvent chamber, DC or AC electricity is switched on between the two electrodes, and finally high-purity liquid crystal materials are extracted. The invention combines the applied electric field method with the absorption method and carries out centralized as well as combined absorption under the function of the applied electric field by respectively utilizing the characteristics and advantages of the two methods, thereby solving the problems that high-resistivity liquid crystal materials are difficult for purification and cannot be continuously as well as stably operated.

Description

technical field [0001] The invention belongs to the technical field of physics and chemistry, and in particular relates to a method for purifying liquid crystals by electric field adsorption. technical background [0002] In addition to high purity (GC≥99.5%), liquid crystal materials for TFT-LCD also require high resistivity (≥1×10 13 Ω·cm), high charge retention (≥98.5%) and stable product quality. For the purification and refining of liquid crystal compounds, the process requirements are stricter and more difficult; the existing purification methods for TN and STN liquid crystals are difficult to meet the requirements, and it also poses challenges to the purification and refining of domestic liquid crystal materials. [0003] The main factors affecting liquid crystal resistivity, charge retention and performance stability are trace inorganic impurities and large polar organic impurities, and these impurities are mainly introduced from raw materials during the synthesis o...

Claims

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Application Information

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IPC IPC(8): C09K19/00B01D15/26B01D17/06
Inventor 张智勇任占冬朱玉婵张开诚
Owner WUHAN POLYTECHNIC UNIVERSITY
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