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Complex solvent for dissolving liquid crystal and liquid crystal testing method

A technology of compound solvent and test method, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of peripheral neuritis, chronic poisoning, occupational hazards of liquid crystal testers, etc., to meet the test requirements and reduce occupational hazards.

Inactive Publication Date: 2018-04-20
SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, long-term exposure to n-hexane can lead to peripheral neuritis and chronic poisoning, and methylene chloride is a potential carcinogen
Therefore, long-term exposure to n-hexane and methylene chloride will bring great occupational hazards to liquid crystal testers

Method used

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  • Complex solvent for dissolving liquid crystal and liquid crystal testing method

Examples

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Embodiment 1

[0017] Mix isopropanol and nitrogen methylpyrrolidone according to a ratio of 50:1, wherein the metal impurity concentrations of isopropanol and nitrogen methylpyrrolidone are respectively lower than 10ppt and 100ppt, and the present invention selects the metal of isopropanol and nitrogenmethylpyrrolidone Impurity concentrations of 10ppt and 100ppt are a specific embodiment, and the metal impurity concentration of the composite solvent after mixing is 11.8ppt. Dissolve the liquid crystal with the compound solvent mentioned above, and test the liquid crystal. Wherein, the peak time of the composite solvent in the test process is 3 minutes, and the peak time of the liquid crystal is 5 minutes, and the dissolution rate of the liquid crystal in the composite solvent is slightly slow, and the solution with a water content of 2% after dissolving After standing for 36 hours, no liquid crystal precipitation occurred, and the peristaltic tube did not deform during the 36 hours. In ord...

Embodiment 2

[0019] Mix isopropanol and nitrogen methylpyrrolidone according to a ratio of 40:1, wherein the metal impurity concentrations of isopropanol and nitrogen methylpyrrolidone are lower than 10ppt and 100ppt respectively, the present invention selects the metal of isopropanol and nitrogenmethylpyrrolidone Impurity concentrations of 10ppt and 100ppt are a specific embodiment, and the metal impurity concentration of the composite solvent after mixing is 12.2ppt. Dissolve the liquid crystal with the compound solvent mentioned above, and test the liquid crystal. Wherein, the peak time of the composite solvent in the test process is 3 minutes, and the peak time of the liquid crystal is 5 minutes, and the dissolution rate of the liquid crystal in the composite solvent is slightly slow, and the solution with a water content of 2% after dissolving After standing for 36 hours, no liquid crystal precipitation occurred, and the peristaltic tube did not deform during the 36 hours. In order t...

Embodiment 3

[0021] Mix isopropanol and nitrogen methylpyrrolidone according to a ratio of 30:1, wherein the metal impurity concentrations of isopropanol and nitrogen methylpyrrolidone are lower than 10ppt and 100ppt respectively, the present invention selects the metal of isopropanol and nitrogenmethylpyrrolidone Impurity concentrations of 10ppt and 100ppt are a specific embodiment, and the metal impurity concentration of the composite solvent after mixing is 12.9ppt. Dissolve the liquid crystal with the compound solvent mentioned above, and test the liquid crystal. Wherein, the peak time of the composite solvent in the test process is 3 minutes, and the peak time of the liquid crystal is 5 minutes, and the dissolution rate of the liquid crystal in the composite solvent is faster, and the solution with a water content of 2% after dissolving After standing for 36 hours, no liquid crystal precipitation occurred, and the peristaltic tube did not deform during the 36 hours. In order to reduc...

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Abstract

The invention discloses a complex solvent for dissolving liquid crystal and a liquid crystal testing method. The complex solvent comprises isopropanol and N-methyl pyrrolidone, wherein a volume ratioof the isopropanol to the N-methyl pyrrolidone is 5:1 to 50:1. The complex solvent with a low metal impurity concentration is prepared from the isopropanol and the N-methyl pyrrolidone according to the volume ratio of 5:1 to 50:1, and the liquid crystal can be well dissolved without a precipitate. Moreover, the appearance time of the complex solvent is earlier than appearance time of each component of the liquid crystal, so that the current testing requirement on the liquid crystal can be met, and occupational hazards on liquid crystal testing personnel can be reduced.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to a composite solvent for dissolving liquid crystals and a method for testing liquid crystals. Background technique [0002] At present, some VA technologies rely on the polymerization of monomers in liquid crystals to form polymer protrusions to provide pretilt angles. The performance indicators of such liquid crystals include reactive monomer concentration, purity, metal ion impurities, and water content. In the VA liquid crystal performance monitoring project, the reactive monomer concentration, purity and metal ion impurities need to be tested after dissolution, which requires the solvent to have good solubility, no precipitation, low impurity concentration, and peak time earlier than any group in the liquid crystal. The commonly used solvents are n-hexane and dichloromethane. [0003] However, long-term exposure to n-hexane can lead to peripheral neuritis and c...

Claims

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Application Information

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IPC IPC(8): G01N33/00
CPCG01N33/00
Inventor 张维维
Owner SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
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