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Diamine compound, polyamic acid and preparation method thereof, polyimide, liquid crystal aligning agent and liquid crystal cell

A technology of liquid crystal aligning agent and amine compound, which is applied in the field of liquid crystal aligning agent, liquid crystal cell and polyimide, which can solve the problems of high ion density, high residual charge, low voltage retention rate of liquid crystal aligning agent, etc., and achieve low ion density , low residual charge, and high voltage retention

Active Publication Date: 2018-09-28
FUYANG XINYIHUA MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a kind of diamine compound and polyamic acid and preparation method thereof, polyimide, liquid crystal aligning agent and liquid crystal cell, solves the problems of low voltage retention rate and high ion density of liquid crystal aligning agent at high temperature in the prior art , The problem of high residual charge when DC voltage is applied

Method used

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  • Diamine compound, polyamic acid and preparation method thereof, polyimide, liquid crystal aligning agent and liquid crystal cell
  • Diamine compound, polyamic acid and preparation method thereof, polyimide, liquid crystal aligning agent and liquid crystal cell
  • Diamine compound, polyamic acid and preparation method thereof, polyimide, liquid crystal aligning agent and liquid crystal cell

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preparation example Construction

[0033] According to another aspect of the present invention, a kind of preparation method according to the compound of the present invention is provided, the method comprises:

[0034] Coupling step: the compound shown in formula II is contacted with the compound shown in formula III to be converted into the compound shown in formula IV;

[0035] Hydrogenation step: -NO in the compound shown in formula IV 2 is reduced to -NH 2 Afterwards, be converted into compound shown in formula I;

[0036]

[0037] Wherein, R in the compound shown in formula II and formula IV 1 , R 2 , R 3 and R 4 each independently selected from -H, -CH 3 、-CH 2 CH 3 and -CH 2 CH 2 CH 3 .

Embodiment approach

[0038] According to one embodiment of the preparation method of the present invention, the coupling step is specifically:

[0039] The compound represented by formula II, the compound represented by formula III, sodium tert-butoxide, tris(dibenzylideneacetone) dipalladium and 2-(di-tert-butylphosphine)biphenyl were added into toluene for reflux reaction.

[0040] According to one embodiment of the preparation method of the present invention, the hydrogenation step specifically includes: the compound represented by formula IV is converted into the compound represented by formula I by hydrogenation under the condition of palladium carbon as a catalyst.

[0041] According to the preparation method of the compound of the present invention, the compound according to the present invention can be prepared, and the synthesis of specific compounds is listed below to illustrate the preparation method of the present invention.

[0042] The concrete compound of synthesis is shown in formu...

Embodiment 1

[0097] In a 500ml three-necked flask, add 8.64g (80mmol, 0.8eq) of the diamine compound formula V-1 (p-phenylenediamine), 8.67g (20mmol, 0.2eq) of the compound shown in the formula I-1 and 210mL NMP (N-methyl base pyrrolidone) solvent, magnetically stirred at room temperature to dissolve, replaced the air in the flask with nitrogen, and then slowly added compound formula VI-1 (1,2,3,4-cyclobutanetetracarboxylic dianhydride) 19.6 to the mixed solution g (100mmol, 1eq), stirred at room temperature for 24h to obtain a polyamic acid solution with a mass concentration of 15%, labeled as PAA-1.

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Abstract

The invention discloses a diamine compound and polyamic acid and preparation methods thereof, polyimide, a liquid crystal alignment agent and a liquid crystal box. The compound disclosed by invention is represented by the formula I described in the specification, wherein R1, R2, R3 and R4 are independently selected from the group consisting of -H, -CH3, -CH2CH3 and -CH2CH2CH3. The preparation method of the compound comprises a coupling step and a hydrogenation step. The invention discloses a preparation method for the polyamide acid by reaction transformation of the diamine compound and an anhydride compound and the polyamide acid prepared by the method. The invention also discloses the polyimide formed by dehydration transformation of the polyamide acid; the invention further discloses the liquid crystal alignment agent comprising the polyamic acid and / or the polyimide and the liquid crystal box containing the liquid crystal alignment agent.

Description

technical field [0001] The invention relates to the field of liquid crystal display, in particular to a diamine compound, polyamic acid and a preparation method thereof, polyimide, a liquid crystal aligning agent and a liquid crystal cell. Background technique [0002] The liquid crystal aligning film used in liquid crystal display elements is formed by coating a liquid crystal aligning agent on the surface of a glass substrate and curing at high temperature. With the refinement of thin film field effect transistor liquid crystal display (TFT-LCD) display elements, the requirements for liquid crystal aligning agents are getting higher and higher, not only requiring liquid crystal aligning agents to have good liquid crystal orientation and electrical properties, but also requiring (such as: high temperature) has the characteristics of high voltage retention rate, low ion density, less accumulated charge when DC voltage is applied, and fast release of accumulated charge. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D249/14C08G73/10C09K19/56G02F1/1337
Inventor 吴京玮王占奇郭林林洪豪志
Owner FUYANG XINYIHUA MATERIAL TECH
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