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A kind of preparation method of colorless transparent polyimide liquid crystal alignment film

A technology of transparent polyimide and liquid crystal alignment film, applied in liquid crystal materials, chemical instruments and methods, etc., can solve problems such as limiting the application of polyimide materials, and achieve the effect of improving transparency

Active Publication Date: 2021-12-14
EAST CHINA UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the alignment film material of liquid crystal display is mainly polyimide (PI) film. However, due to the influence of the conjugated structure in the structure, the traditional aromatic PI will absorb visible light and appear yellow or brown, and the traditional aromatic PI alignment film has a low pretilt angle. Only 1°~2°, which greatly limits the application of polyimide materials in the field of liquid crystal display

Method used

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  • A kind of preparation method of colorless transparent polyimide liquid crystal alignment film
  • A kind of preparation method of colorless transparent polyimide liquid crystal alignment film
  • A kind of preparation method of colorless transparent polyimide liquid crystal alignment film

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Experimental program
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Effect test

Embodiment 1

[0023] Step A): At room temperature, weigh 2.91g of dianhydride monomer 6FDA and 2.05g of diamine monomer TFMB according to the molar ratio of dianhydride monomer 6FDA to diamine monomer TFMB of 1.02:1. Then measure 30 ml of dried DMAC to ensure that the solid content of the reaction system is 15%. Then pour all the diamine monomer TFMB into a dry 50ml reaction container, add 25ml of DMAC and turn on the switch of the magnetic stirrer, wait until the diamine monomer TFMB is completely dissolved, then add the dianhydride monomer 6FDA into the reaction container three times, Each interval is 10 minutes. After the feeding is completed, rinse the residual monomer on the wall of the bottle with 5ml DMAC, and then pass nitrogen gas for 20 minutes. After 12 hours of reaction, a colorless and transparent polyamic acid solution is obtained. Seal the polyamic acid solution and store it in the refrigerator. ready for use. After 12 hours of reaction, the rotational viscosity of the polya...

Embodiment 2

[0026] The difference between Embodiment 2 and Embodiment 1 is that the types of liquid crystals poured in the liquid crystal cell are different. The liquid crystal cell is filled with TEB300 nematic liquid crystal and two kinds of cholesteric liquid crystals. and TEB300 two kinds of nematic liquid crystals were prepared by adding 2% R5011 chiral agent, and then using a polarizing microscope to observe the orientation uniformity of liquid crystal molecules in the cell, as shown image 3 The polarized photogram shown.

[0027] image 3 Middle (1) is the polarized light micrograph of cholesteric liquid crystal after adding 2% chiral agent to E7, (2) is the polarized light micrograph of cholesteric liquid crystal added to TEB300 with chiral agent, (3) and (4) respectively It is the polarized photomicrograph of bright state and black state of TEB300 nematic liquid crystal. It can be seen from the polarized light micrographs that changing the colorless transparent polyimide align...

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Abstract

The invention discloses a preparation method of a colorless and transparent polyimide liquid crystal alignment film. At room temperature, the dianhydride monomer 6FDA and the diamine monomer TFMB are reacted in DMAC to prepare a polyamic acid solution, and then the polyamic acid The amic acid solution is evenly coated on the glass substrate, and after prebaking and thermal imidization treatment, the liquid crystal cell is filled with E7 nematic liquid crystal, and the pretilt angle can reach 6.9° measured by the crystal rotation method. The polyimide liquid crystal alignment film has obvious advantages over ordinary aromatic polyimide alignment films. It is a colorless and transparent film, and the alignment film can obtain a high pretilt angle of 6.9°, which can well meet the needs of liquid crystal displays. Field The requirements for colorless and large pretilt angle of alignment film materials can be used as alignment film materials for super twisted nematic liquid crystal displays.

Description

【Technical field】 [0001] The invention relates to the technical field of liquid crystal display materials, in particular to a preparation method of a colorless and transparent polyimide liquid crystal alignment film. 【Background technique】 [0002] With the continuous development of liquid crystal display technology, super twisted nematic (STN) liquid crystal display has become an important research direction of liquid crystal display due to its high definition and large information capacity. In order to avoid disclination caused by liquid crystal anti-tilt phenomenon during use, it is required that the liquid crystal molecules in the display and the surface of the alignment film must have a certain pre-tilt angle. The size of the pretilt angle will determine the alignment state of the liquid crystal molecules in the liquid crystal cell, and then affect the photoelectric characteristics of the liquid crystal display. The preparation of an alignment film with a large pretilt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C08J5/18C09K19/56C08L79/08
CPCC08G73/1067C08G73/1039C08J5/18C09K19/56C08J2379/08
Inventor 曹红亮施利凯钟宝其张心悦
Owner EAST CHINA UNIV OF SCI & TECH
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