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Liquid crystal orientation agent and application thereof

A technology of liquid crystal aligning agent and liquid crystal aligning film, which is applied in the direction of liquid crystal materials, chemical instruments and methods, etc., and can solve the problems of accumulating images, retention, low contrast and low charge, etc.

Pending Publication Date: 2021-11-02
波米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned technologies are difficult to simultaneously solve the problems of low contrast caused by low voltage retention rate of liquid crystal display elements in a high-temperature environment and image retention caused by charge accumulation during long-term continuous operation.

Method used

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  • Liquid crystal orientation agent and application thereof
  • Liquid crystal orientation agent and application thereof
  • Liquid crystal orientation agent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A kind of polyimide, its preparation method comprises the following steps:

[0071] S1, put 23.78g of DDM (monomer 1 containing diamine structure) into a three-necked flask with nitrogen protection, add 250g of NMP, mix well, and then add 48.05g of CpODA (monomer 2 containing dianhydride structure ), reacted for 24 hours at normal temperature;

[0072] S2, heating the reaction liquid obtained in S1 to raise the temperature to 60° C., then adding 49.38 g of pyridine and 63.75 g of acetic anhydride to the reaction liquid, and reacting for 24 hours;

[0073] S3, adding the reaction solution obtained in S2 into ethanol for spinning to obtain a white filamentous solid, and washing the obtained white filamentous solid with ethanol to obtain a crude polyimide product.

[0074] S4: Put the crude polyimide product obtained in S3 into 250 g of NMP, fully dissolve it, then add it into ethanol for reprecipitation, filter and retain the solid, and obtain a refined polyimide product...

Embodiment 2

[0076] A kind of polyimide, its preparation method comprises the following steps:

[0077] S1, put 24.90g of NDA (monomer 1 containing diamine structure) into a three-necked flask with nitrogen protection, add 250g of NMP, mix well, and then add 48.05g of CpODA (monomer 2 containing dianhydride structure) ), reacted for 24 hours at normal temperature;

[0078] S2, heating the reaction liquid obtained in S1 to raise the temperature to 60° C., then adding 49.38 g of pyridine and 63.75 g of acetic anhydride to the reaction liquid, and reacting for 24 hours;

[0079] S3, adding the reaction solution obtained in S2 into ethanol for spinning to obtain a white filamentous solid, and washing the obtained white filamentous solid with ethanol to obtain a crude polyimide product.

[0080] S4: Put the crude polyimide product obtained in S3 into 250 g of NMP, fully dissolve it, then add it into ethanol for reprecipitation, filter and retain the solid, and obtain a refined polyimide produc...

Embodiment 3

[0082] A kind of polyimide, its preparation method comprises the following steps:

[0083] S1, put 32.29g of BAPr (monomer 1 containing diamine structure) into a three-necked flask with nitrogen protection, add 250g of NMP, mix well, and then add 48.05g of CpODA (monomer 2 containing dianhydride structure) ), reacted for 24 hours at normal temperature;

[0084] S2, heating the reaction liquid obtained in S1 to raise the temperature to 60° C., then adding 49.38 g of pyridine and 63.75 g of acetic anhydride to the reaction liquid, and reacting for 24 hours;

[0085] S3, adding the reaction solution obtained in S2 into ethanol for spinning to obtain a white filamentous solid, and washing the obtained white filamentous solid with ethanol to obtain a crude polyimide product.

[0086] S4: Put the crude polyimide product obtained in S3 into 250 g of NMP, fully dissolve it, then add it into ethanol for reprecipitation, filter and retain the solid, and obtain a refined polyimide produ...

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Abstract

The invention relates to the field of functional polyimide materials, and particularly discloses a liquid crystal orientation agent and application thereof. The liquid crystal orientation agent comprises polyimide, wherein a repeating structural unit of polyimide is shown as a general formula (I) in the description. The preparation method of polyimide comprises the steps of prepolymerization, ring formation, spinning, washing and the like. The liquid crystal orientation agent can be used for preparing a liquid crystal orientation film and a liquid crystal element, and the prepared liquid crystal element has the characteristics of high voltage retention rate under high-temperature work and low charge accumulation under long-time work.

Description

technical field [0001] This application relates to the field of functional polyimide materials, more specifically, it relates to a liquid crystal aligning agent and its application. Background technique [0002] Liquid crystal alignment film is a kind of functional material used in the manufacture of liquid crystal display devices (LCD). Its function is to induce the orientation of liquid crystal (LC) molecules, thereby producing a uniform response to the applied voltage. Various arrangements of liquid crystal molecules, such as 90° twist, 180°-270° super twist, in-plane arrangement or vertical arrangement, will produce different display methods, resulting in various liquid crystal panels, including twisted nematic liquid crystal displays (TN-LCD), Super Twisted Liquid Crystal Display (STN-LCD), Thin Film Transistor Driven Liquid Crystal Display (TFT-LCD), etc. [0003] The performance requirements of various modes of LCD on the alignment film usually depend on the display ...

Claims

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Application Information

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IPC IPC(8): C08G73/10C09K19/56
CPCC08G73/1078C08G73/1007C09K19/56
Inventor 李铭新王华森张翠红
Owner 波米科技有限公司
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