Alignment film material, liquid crystal alignment agent, liquid crystal alignment film, and liquid crystal display element
A technology of liquid crystal alignment film and liquid crystal alignment agent, which is applied in liquid crystal materials, instruments, optics, etc., can solve the problems of afterimage display element voltage retention rate, slow release speed of accumulated charge, and poor alignment of liquid crystal, so as to avoid the decrease of display contrast, Good anti-image retention and the effect of suppressing the generation of afterimages
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Synthetic example
[0102] 1. The synthetic route of b-1
[0103] (1) Synthesis of b-1-1
[0104] Take compound a (2.63g 10mmol), compound b phenylboronic acid (1.21g 10mmol) in a 250ml three-necked flask, add potassium phosphate (1.07g 5mmol), tetrakis triphenylphosphine palladium (0.5g 0.5mmol) ethanol (120ml) The reaction was carried out at 90° C. for 12 h under nitrogen atmosphere. The progress of the reaction was detected by TLC, and after the reaction was completed, it was cooled to room temperature. The salt was removed by suction filtration, extracted with EA, washed 5 times with saturated brine, and the solvent was removed by rotary evaporation. The white solid product b-1-1a (1.44g) was separated by PE / EA column chromatography, the yield was 67.0%, and the product was measured by HPLC-MS (M+1)=215.07.
[0105] (2) Synthesis of b-1-1b
[0106]Take compound b-1-1a (2.14g 10mmol) in a 100ml three-necked flask, add hydrochloric acid (2ml), hydrogen peroxide (5ml) acetic acid (50ml) an...
Synthetic example A-1-1
[0206] Under a nitrogen atmosphere, drop 1-(4-(4-heptylcyclohexyl)phenoxy)-2,4-diaminobenzene (42.5g, 112mmol) into a 500mL three-necked round-bottomed flask (the following Abbreviated as b-2-8), p-phenylenediamine (3.50g, 32.4 mmol) (hereinafter referred to as b-2-1), p-aminodiphenylethane (6.11g, 35.6 mmol) (hereinafter referred to as b-2 -3) and 96.12 g of NMP, the resulting suspension was stirred until a yellow solution was obtained. Then 38.54g (180 mmol) of 2,3,5-tricarboxycyclopentylacetic dianhydride (hereinafter abbreviated as a-2) plus 0.40 g (4 mmol) of n-hexylamine as a molecular weight regulator and 96.12 g of NMP were added to the system. The reaction was exothermic and stirred at room temperature for 4 hours to obtain polyamic acid polymer A-1-1 with a solid content of 20% dissolved in NMP. Then add 400 millimoles of acetic anhydride and 50 millimoles of pyridine at 60 degrees, react at 60 degrees for 3 hours, pour the obtained polyimide into 2000 milliliters o...
Embodiment 1
[0241] The liquid crystal aligning agent of Example 1 was coated on a first glass substrate with an ITO electrode by roll coating to form a pre-coating layer. After pre-curing (hot plate, 85°C, 10 minutes), main curing (circulation oven, 225°C, 50 minutes), exposure (254nm polarized light, 5mW / cm 2 , 1000mj / cm 2 ) will obtain the first glass substrate with the liquid crystal alignment film of embodiment 1 formed on the ITO electrode.
[0242] The liquid crystal aligning agent of Example 1 was coated on a second glass substrate without an ITO electrode by roller coating to form a pre-coat layer. The second glass substrate on which the liquid crystal aligning film of Example 1 is formed is obtained after the above-mentioned pre-curing, main curing, and light exposure.
[0243] An ultraviolet curable glue is coated on the periphery of one of the first glass substrate and the second glass substrate, and a 3.5 μm spacer is sprinkled on the other substrate. Then the two glass sub...
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