Compound, oriented material, oriented membrane and their preparation methods and application
An alignment material and composite technology, applied in the field of preparation of the alignment film, can solve problems such as side reactions, poor alignment effect, and difficulty in controlling the uniformity of friction.
Inactive Publication Date: 2012-09-12
BOE TECH GRP CO LTD
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Problems solved by technology
However, there are also the following disadvantages at the same time: a large amount of dust particles are generated during the rubbing process, which will have a negative impact on the alignment film and the device, and require subsequent processing, which increases the process time and cost; static electricity is generated during the rubbing process. TFT-LCD transistors will cause breakdown; when applied to large-area substrates, it is difficult to control the uniformity of friction, etc.
However, when UV light is irradiated, the photoreactive end groups at both ends randomly undergo polymerization reactions, which not only generate the polymer network structure of the main reaction, but also cause side reactions, resulting in the generation of unnecessary by-products
This by-product will affect the liquid crystal in contact, resulting in poor alignment
Method used
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Embodiment 1
[0028] Preparation of oriented materials
[0029] Add 130 mL of absolute ethanol and 130 mL of distilled water to a 500 mL three-necked flask, and add 0.1 mol of 4-cyano-4'-hydroxybiphenyl and 0.2 mol of 1,6-dibromohexane to it. Under stirring, the water bath is heated to reflux. After all is dissolved, 40 mL of potassium hydroxide (0.25 mol) of ethanol aqueous solution (by volume ratio, ethanol: water = 1:1) is slowly added dropwise. After the dropping, the reaction was continued for 4 hours. Stop the reaction and filter with suction while hot to obtain a white solid. After drying, recrystallize with 1,2-dichloroethane to obtain white flaky crystals, namely 4-cyano-4′-(6-bromohexyloxy)biphenyl .
[0030] 1 H-NMR (200MHz, CDCl 3 ): δ 1.446 (4H, m), 1.784 (2H, m), 1.817 (2H, m), 3.431 (2H, q), 3.991 (2H, q), 6.945 (4H, m), 7.452 (4H, m).
[0031] Add 0.05 mol potassium acrylate, 0.025 mol 4 cyano 4′-(6-bromohexyloxy) biphenyl, 0.2 g tetrabutyl ammonium bromide and 180 mL dried N,...
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Abstract
The invention relates to a compound, an oriented material, an oriented membrane and their preparation methods and application. The compound has a general formula of A-B-C-B'-D, wherein A represents a photoreaction end group; B and B' are the same or different and represent linear alkyl having 1-6 single bonds or carbon atoms; C represents an alkoxybiphenyl group, a cholesterol fatty acid ester group, a Schiff base group, an azophenyl group, a distyryl group, a diphenylethynyl group, a biphenyl group, or a triphenyl group; and D represents an end group having no polymerization activity. The oriented material contains the compound. The oriented material can improve orientation effects of a liquid crystal display panel.
Description
Technical field [0001] The invention relates to a composite, an orientation material and an orientation film formed by the orientation material, and also relates to a preparation method and application of the orientation film. Background technique [0002] In the manufacturing process of the liquid crystal panel, a uniformly arranged alignment film is usually used to realize the alignment of the liquid crystal molecules, and the uniformity of the liquid crystal alignment directly affects the quality of the display. Regarding the orientation technology of the orientation film, the industry currently adopts the traditional rubbing orientation technology and the non-rubbing orientation technology developed in recent years. Among them, the rubbing alignment technology uses a high-speed rotating rubbing roller to rub the alignment film formed on the surface of the substrate in the manufacturing process of the liquid crystal panel, so that the alignment film molecules are aligned along...
Claims
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IPC IPC(8): C07C255/54C07C253/30C09K19/56G02F1/1337
CPCG02F1/133788C07C255/54C09K2019/0448C09K2019/548G02F1/133703G02F1/133711
Inventor 李会
Owner BOE TECH GRP CO LTD