Method for preparing polyimide film by adopting chemical imidization in combined mode
A polyimide film and chemical imidization technology, applied in the field of combined chemical imidization manufacturing of polyamic acid and polyamic acid chemical imidization manufacturing, can solve the problem of low production efficiency, poor finished product performance, Lack of market competitiveness and other problems, to achieve the effects of good dimensional stability, small internal stress, and small coefficient of linear expansion
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Embodiment 1
[0030]Take 600kg of polyamic acid solution with a solid content of 20% and a viscosity of 245,100 centipoise, and keep the temperature below 0°C, quickly mix it with dehydrating agent and catalyst (dehydrating agent: thionyl chloride 11kg, 1,3-dichlorohexyl Carbodiimide 17kg, catalyst: N,N-dimethylaminopyridine 19kg, triethylenediamine 25kg), after mixing and defoaming, cast the film immediately, pay attention to the casting die lip During the whole process of the mouth, the temperature of the glue solution is always kept below 0°C. When the extrusion die device flows from the gap of the casting nozzle to the closed clean system running below it, the endless stainless steel belt running at a speed of 18m / min is cast into a film of uniform thickness, and the chemical sublimation is carried out at 75°C. Amination, after one week of circulation, the preliminary chemically imidated gel film is peeled off the endless steel strip by the peeling roller, and then sent to the bath tank...
Embodiment 2
[0032] Take 650kg of a polyamic acid solution with a solid content of 21% and a viscosity of 255,300 centipoise, and keep the temperature below 0°C, and quickly mix it with a dehydrating agent and a catalyst (dehydrating agent: 18kg of acetic anhydride, 1,3-dichlorohexyl carbonization Diimine 22kg, catalyst: N,N-dimethylaminopyridine 21kg, triethylenediamine 24kg), after mixing and defoaming, cast the film immediately, pay attention to the casting die lip During the whole process, the glue temperature is always kept below 0°C. When the extrusion die device flows from the gap of the casting nozzle to the closed clean system running below it, it is cast on the endless stainless steel belt running at a speed of 25m / min to form a film of uniform thickness, and the chemical sublimation is carried out at 65°C. Amination, after one week of circulation, the preliminary chemically imidated gel film is peeled off the endless steel strip by the peeling roller, and then sent to the bath t...
Embodiment 3
[0034] Take 600kg of a polyamic acid solution with a solid content of 19% and a viscosity of 233,600 centipoise, and keep the temperature below 0°C, quickly mix it with a dehydrating agent and a catalyst (dehydrating agent: thionyl chloride 11kg, N,N-dicyclohexyl Carbodiimide 30kg, catalyst: quinoline 15kg, triethylenediamine 31kg), after mixing and defoaming, cast the film immediately, pay attention to the glue in the whole process of entering the lip of the casting die The temperature is always kept below 0°C. When the extrusion die device flows from the gap of the casting nozzle to the closed clean system running below it, the endless stainless steel belt running at a speed of 10m / min is cast into a film of uniform thickness, and the chemical sublimation is carried out at 85°C. Amination, after one week of circulation, the preliminary chemically imidated gel film is peeled off the endless steel strip by the peeling roller, and then sent to the bath tank with a length of 5 m...
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