Method for preparing polyimide liquid crystal aligning agent

A technology of liquid crystal aligning agent and polyimide, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of high single-point defect rate and insufficient

Inactive Publication Date: 2014-12-10
SHENZHEN DALTON ELECTRONICS MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For PI cured by ultraviolet polymerization, the components of the PI directing film stock solution are polyimide with ultraviolet photosensitive groups and solvents. Since the irradiation direction of this PI is the orientation direction of liquid crystal, it has fast production efficiency and convenient operation. However, because it is often not sufficiently aggregated, the current products made of it have a high single-point defect rate in display, and it is only suitable for the production of some light conversion curtain walls, and it is rarely used in LCD displays.

Method used

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  • Method for preparing polyimide liquid crystal aligning agent
  • Method for preparing polyimide liquid crystal aligning agent
  • Method for preparing polyimide liquid crystal aligning agent

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0052] At room temperature, under nitrogen protection, 10 g of the specific diamine was dissolved in 50 ml of N-methylpyrrolidone. Add 14.5 g of pyromellitic dianhydride and stir for 2 hours. Add 10 g of 4,4'-diaminobenzenemethane and stir for 36 h. It was diluted with 600 ml of 1,4-butyrolactone to obtain a polyimide liquid crystal alignment liquid. A liquid crystal cell is made, and the measured pretilt angle is 10.5 degrees.

preparation Embodiment 2

[0054] At room temperature, under nitrogen protection, 10 g of the specific diamine was dissolved in 200 ml of N-methylpyrrolidone. Add 11.7 g of pyromellitic dianhydride and stir for 2 hours. Add 8 g of 3,3'-diaminobenzophenone, and stir for 36 h. It was diluted with 200 ml of 1,4-butyrolactone to obtain a polyimide liquid crystal alignment liquid. A liquid crystal cell is made, and the measured pretilt angle is 11.1 degrees.

[0055]

preparation Embodiment 3

[0057]At room temperature, under nitrogen protection, 10 g of the specific diamine was dissolved in 100 ml of N-methylpyrrolidone. Add 10.5 g of 3,4,9,10-perylenetetracarboxylic anhydride, and stir for 2 hours. Add 8 g of 3,3'-diaminobenzophenone, and stir for 36 h. It was diluted with 500 ml of 1,4-butyrolactone to obtain a polyimide liquid crystal alignment liquid. A liquid crystal cell is made, and the measured pretilt angle is 12.4 degrees.

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Abstract

The invention discloses a method for preparing a polyimide liquid crystal aligning agent. The method comprises the following steps: 1, dissolving specific diamine in an organic solvent in the presence of nitrogen at room temperature; 2, adding organic tetracid dianhydride, and stirring for a period of time 3, adding organic diamine, and stirring for a period of time; 4, diluting by an organic diluent; and 5, preparing the polyimide liquid crystal aligning agent.

Description

technical field [0001] The invention relates to a preparation method of a polyimide liquid crystal aligning agent. Background technique [0002] Polyimide English name: Polyimide, abbreviation: PI. [0003] Polyimide refers to a class of polymers containing imide rings (-CO-NH-CO-) on the main chain, among which polymers containing phthalimide structures are the most important. As a special engineering material, polyimide has been widely used in aviation, aerospace, microelectronics, nanometer, liquid crystal, separation membrane, laser and other fields. In the 1960s, all countries listed the research, development and utilization of polyimide as one of the most promising engineering plastics in the 21st century. [0004] In terms of LCD display screens, liquid crystal displays must have a good and stable initial alignment of liquid crystal molecules in order to obtain high-quality imaging effects. Therefore, the research on the alignment of liquid crystals has become a key...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C09K19/56
Inventor 王胜林王建新黎厚明
Owner SHENZHEN DALTON ELECTRONICS MATERIAL CO LTD
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