Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element having thereof
A liquid crystal alignment agent and solvent technology, applied in liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of slow elimination of accumulated charges and poor process stability.
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Synthetic example A-1-1
[0131] A nitrogen inlet, a stirrer, a condenser, and a thermometer are arranged on a four-necked conical flask with a volume of 500 milliliters, and nitrogen is introduced. Then, 0.188 grams (0.0005 moles) of 1-octadecyloxy-2,4-aminobenzene (hereinafter referred to as b-1-1), 9.83 grams (0.0495 moles) of 4,4'-diamine Diphenylmethane (hereinafter referred to as b-2-1) and 80 grams of N-methyl-2-pyrrolidone (hereinafter referred to as NMP), and stirred at room temperature until dissolved. Then, add 26.8 grams (0.04 moles) of 9,9-bis[4-(3,4-dicarboxylic acid phenoxy)-2-methylphenyl] stilbenic dianhydride (hereinafter referred to as a-1-1 ), 2.18 grams (0.01 mole) of pyromellitic dianhydride (hereinafter abbreviated as a-2-1) and 20 grams of NMP, and reacted at room temperature for 2 hours. After the reaction, the reaction solution was poured into 1500 ml of water to precipitate the polymer, and the obtained polymer was filtered, and the steps of washing and filtering were repeat...
Synthetic example A-2-1
[0135] A nitrogen inlet, a stirrer, a heater, a condenser tube and a thermometer are arranged on a four-neck conical flask with a capacity of 500 milliliters, and nitrogen is introduced. Then, 0.188 g (0.0005 mol) of b-1-1, 9.83 g (0.0495 mol) of b-2-1 and 80 g of NMP were added, and stirred at room temperature until dissolved. Next, 26.8 g (0.04 mol) of a-1-1, 2.18 g (0.01 mol) of a-2-1, and 20 g of NMP were added. After reacting at room temperature for 6 hours, 97 g of NMP, 2.55 g of acetic anhydride, and 19.75 g of pyridine were added, the temperature was raised to 60° C., and stirring was continued for 2 hours to carry out imidization reaction. After the reaction, the reaction solution was poured into 1500 ml of water to precipitate the polymer, and the obtained polymer was filtered, and the steps of washing and filtering were repeated three times with methanol. Afterwards, the product was placed in a vacuum oven and dried at a temperature of 60° C. to obtain a polyimide ...
Embodiment 1
[0141] Add 100 parts by weight of polymer (A-1-1) to 1200 parts by weight of N-methyl-2-pyrrolidone (hereinafter referred to as B-1) and 600 parts by weight of ethylene glycol n-butyl ether (hereinafter referred to as In B-2), at room temperature, the liquid crystal alignment agent can be prepared by continuously stirring with a stirring device until it dissolves.
[0142]Then, use a printing machine (manufactured by Nippon Photo Printing Co., Ltd., model S15-036) to apply the liquid crystal alignment agent prepared above to two glass substrates with conductive films made of ITO (indium-tin-oxide) respectively. , and form a precoat. Next, the pre-coat layer was placed on a hot plate and pre-baked at a temperature of 100°C. After 5 minutes, the pre-coat was removed and placed in a circulating oven at a temperature of 220° C. for post-bake. After 30 minutes, the pre-coating layer is subjected to alignment treatment to form a liquid crystal alignment film on the glass substrate...
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