Flexible display device, polyamic acid varnish for display, and polyimide film
A polyimide film and polyamic acid technology, which is applied in the directions of instruments, coatings, identification devices, etc., can solve the problems of increased polyamic acid viscosity, disadvantageous polyamic acid varnish, excellent thermodynamic properties, etc., and achieves film-forming properties. Good, good wetting effect, excellent film thickness uniformity
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Embodiment 1
[0120] A 1L three-neck flask was equipped with mechanical stirring, a spherical condenser and a nitrogen guide head. Put 136.12 gNMP and 0.09mol PDA into the reaction flask. After the PDA was completely dissolved, add 0.085mol BPDA, 0.01mol PMDA and 0.004mol CBDA, and then the mixture was reacted at 30°C for 8 hours. Subsequently, the reaction temperature was lowered to 20° C., and 0.01 mol DAPBI, 0.001 mol DAPBO and 20 g NMP were sequentially added to the reaction solution, and the polymerization reaction was carried out at 20° C. for 10 h after the addition was completed. 0.001 mol of PEPA and 10 g of NMP were sequentially added to the reaction liquid, and the reaction was continued at 20° C. for 10 h to obtain a polyamic acid varnish.
[0121] The obtained polyamic acid varnish is formed into a uniform slit film on the glass substrate through a coating machine, and the obtained wet film is dried in HVCD at 80°C for 15 minutes, and then the obtained gel film is transferred t...
Embodiment 2
[0123] A 1L three-neck flask was equipped with mechanical stirring, a spherical condenser and a nitrogen guide head. Put 158.1 gNMP and 0.08mol PDA into the reaction flask. After the PDA was completely dissolved, add 0.085mol BPDA, 0.01mol DEDA and 0.005mol PMDA, and then the mixture was reacted at 70°C for 2 hours. Subsequently, the reaction temperature was lowered to 15°C, and 0.02mol DAPBI and 20g NMP were sequentially added to the reaction liquid, and after the addition was completed, the polymerization reaction was carried out at 15°C for 6 hours. Add 0.002mol HP and 10g NMP to the reaction solution in sequence, and continue to react at 15° C. for 6 hours to obtain a polyamic acid varnish.
[0124] The obtained polyamic acid varnish is formed into a uniform slit film on the glass substrate through a coating machine, and the obtained wet film is dried in HVCD at 80°C for 15 minutes, and then the obtained gel film is transferred to an infrared high-temperature OVEN, The po...
Embodiment 3
[0126] A 1L three-neck flask equipped with mechanical stirring, spherical condenser and nitrogen guide head, put 204.7 gNMP and 0.09mol PDA into the reaction flask, after the PDA is completely dissolved, add 0.08mol BPDA, 0.016mol PMDA and 0.004mol BSAA, and then the mixture was reacted at 90°C for 2 hours. Subsequently, the reaction temperature was lowered to 10°C, and 0.01mol DAPBO and 20g NMP were sequentially added to the reaction liquid, and after the addition was completed, the polymerization was carried out at 10°C for 6 hours. Add 0.004mol HP and 10g NMP to the reaction solution in sequence, and continue to react at 10° C. for 6 hours to obtain a polyamic acid varnish.
[0127] The obtained polyamic acid varnish is formed into a uniform slit film on the glass substrate through a coating machine, and the obtained wet film is dried in HVCD at 80°C for 15 minutes, and then the obtained gel film is transferred to an infrared high-temperature OVEN, The polyimide film can b...
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