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Triazine nitrogen-containing heterocyclic diamine, polyimide and polyimide liquid crystal aligning agent

A technology of polyimide and triazine, which is applied in liquid crystal materials, instruments, organic chemistry, etc., can solve the problems of difficult and expensive synthesis of nitrogen-containing heterocyclic diamines, and achieve good antistatic properties and stable orientation Effect

Active Publication Date: 2019-07-30
SHENZHEN FISHER NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved in the present invention is: to overcome the defects that the existing nitrogen-containing heterocyclic diamines for preparing liquid crystal alignment agents are difficult to synthesize and expensive, and the present invention adopts a triazine-type nitrogen-containing heterocyclic diamines. The amine also has a side chain that can stably control the pretilt angle. The liquid crystal aligning agent using this diamine can obtain a stable and high pretilt angle while having excellent electrostatic discharge ability

Method used

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  • Triazine nitrogen-containing heterocyclic diamine, polyimide and polyimide liquid crystal aligning agent
  • Triazine nitrogen-containing heterocyclic diamine, polyimide and polyimide liquid crystal aligning agent
  • Triazine nitrogen-containing heterocyclic diamine, polyimide and polyimide liquid crystal aligning agent

Examples

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preparation example Construction

[0054] The following introduces the preparation of polyimide liquid crystal alignment agent

[0055] The liquid crystal aligning agent prepared by reacting the diamine and dianhydride described in the formula (6) of the present invention must be prepared according to the known preparation method of soluble polyimide, that is, the dianhydride and the diamine are in polar solvents such as NMP and DMSO. Under nitrogen protection, react at 100-250°C for 8 hours. It is better to generate polyimide (PI) by one-step imidization at 150-200°C, and then precipitate PI solid powder in a poor solvent such as methanol, and then use A good solvent of PI such as NMP is re-dissolved, and dilute to a solid content of 4-6% by adding ethylene glycol butyl ether.

Embodiment

[0057] Abbreviations and structures of monomers and solvents used in the examples

[0058] D1: 2,3,5-tricarboxycyclopentylacetic dianhydride;

[0059] D2: cyclobutane tetra-acid dianhydride;

[0060] A1: 4,4-p-phenylenediamine

[0061] A2: 2,2-bis[4-(4-aminophenoxy)phenyl]propane

[0062] A3: side chain diamine containing triazine nitrogen heterocycle

[0063]

[0064] A4: No nitrogen heterocyclic side chain diamine

[0065]

[0066] Solvent:

[0067] NMP:N-Methylpyrrolidone

[0068] BC: Ethylene glycol butyl ether

Synthetic example 1

[0070] Under nitrogen protection, 22.8g (0.065mol) A3 and 10.58g (0.098mol) A1 were added to 280g of NMP, then 36g (0.16mol) of dianhydride D1 was added, two drops of pyridine were added, and the temperature was raised to 180°C for reaction After 8 hours, the solution was poured into a large amount of methanol to precipitate a white PI precipitate, and the solvent in the white PI was evaporated to dryness under reduced pressure to obtain PI powder. Weigh 5g of PI powder, redissolve and filter with 55g of NMP and 45g of BC, the viscosity is 21cp / 25°C, and filter through a 0.45 micron microfiltration membrane to obtain alignment agent A.

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Abstract

Triazine nitrogen-bearing heterocyclic diamine has a structure shown as in formula (6) shown in the description, wherein R1, R2 and R3 are H, CF3 or C1-12 alkyl structures, or liquid crystalline structures, shown in the description, bonded to benzene rings, wherein R4 to R9 are H1-12 or C1-12 alkyl groups. A polyimide liquid crystal aligning agent prepared with the triazine nitrogen-bearing heterocyclic diamine provided herein provides stable alignment, is better than common like liquid crystal aligning agents in antistatic property, and is applicable to various modes of LCD (liquid crystal display) devices having special requirement on static electricity.

Description

technical field [0001] The invention relates to a triazine-type nitrogen-containing heterocyclic diamine, and polyimide and polyimide liquid crystal alignment agent prepared by using the diamine. The polyimide liquid crystal alignment agent has stable alignment ability and Excellent electrostatic discharge ability. Background technique [0002] With the continuous expansion of the application range of LCD, there will be static interference in many applications. If the LCD has not been treated with anti-static, then the part on the electrostatic induction will not disappear for a long time, and the display will not be normal for a long time. Display the desired content. At the same time, in the production process, such as rubbing orientation, due to the potential difference between the rubbing fleece, the machine, the ITO glass and the orientation film surface, tens of thousands of volts of static electricity will be generated instantaneously, which will easily lead to the b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/56C07D251/18G02F1/1337C08G73/10
CPCC07D251/18C08G73/1007C08G73/1085C09K19/56G02F1/133723
Inventor 许华兵刘呈贵向少华钟平洪
Owner SHENZHEN FISHER NEW MATERIALS CO LTD
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