Industrial method for preparing PPTA spinning slurry with solid sulphuric acid
A technology of solid sulfuric acid and slurry, which is applied in the direction of spinning solution preparation, filament forming treatment, textiles and papermaking, etc. It can solve the problems that solid sulfuric acid needs to be prepared separately, it is difficult to obtain, and extrusion conditions affect the uniformity of liquid crystal solution, etc., to achieve Excellent self-cleaning effect, reduced resin degradation, excellent mixing effect
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Embodiment 1
[0018] 180 kilograms of solid sulfuric acid with a concentration of 100.1% and 45 kilograms of dry PPTA resin with a logarithmic reduced viscosity of 6.0 are added to a three-axis planetary mixer with an effective volume of 300 liters. The stirring speed is 120 rpm and the jacket temperature is 0 Mix at -3°C for 20 minutes, then pour hot water at 95°C into the jacket, heat up to the mixture is completely dissolved while stirring and vacuuming, the temperature of the melt is controlled at 75°C, and the total residence time is about 2 hours. Then use the screw pump at the bottom of the tank to add the slurry to a continuous biaxial mixer and kneader at a speed of 1.25 kg / min for mixing, kneading, and shearing to form a uniform liquid crystal slurry. The screw diameter of the twin-shaft mixing and kneading machine is 75mm, L / D=40, mixing, kneading and extruding into a mixing batch with a volume of 300 liters, defoaming In the kettle, the temperature is 80°C and the pressure is 0...
Embodiment 2
[0021]Add 180 kg of liquid sulfuric acid with a concentration of 100.1% into a three-axis planetary mixer with an effective volume of 300 liters, stir for 30 minutes at a stirring speed of 120 rpm and a jacket temperature of -10 to 0 ° C, and let the liquid sulfuric acid form a solid Sulfuric acid, then add 45 kg of dry PPTA resin with a logarithmic reduced viscosity of 6.0 and mix for 20 minutes; then pass hot water at 100°C into the jacket, and heat up to the mixture completely dissolved while stirring and vacuumizing. The temperature of the melt is controlled at 85° C., and the residence time of PPTA / H2SO4 is about 2 hours, and then the slurry is added to the continuous twin-shaft mixing and kneader with a screw pump at a speed of 1.25 kg / min. The screw diameter of the twin-shaft mixing and kneading machine is 75mm, L / D=40, and the jacket temperature is 85°C, and the rotation speed is 120rpm. Mixing, kneading and extruding into a mixing batch with a volume of 300 liters, def...
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