Quality optimization of high flow and impact polypropylene EP533N
Based on the market feedback information of high flow and impact copolymerized polypropylene EP533N,a new catalyst-electron donor system was used to optimize the process parameters of polymerization,steaming,drying,extrusion and other units,and to optimize the composite additive system to improve product quality.The results show that the optimized parameters of the process adopted new catalyst system are as follows:the ethylene gas ratio in the fluidized bed reactor is reduced to 0.33-0.36,the temperature in the fluidized reactor is increased to 79-81℃,the steam volume in the evaporator is increased to 2 000-2 200 kg/h,and the temperature of the extruder cylinder is reduced to 200-210℃.The bending modulus of EP533N reaches 1 327 MPa,its impact strength remains stable at 9.50 kJ/m2,and its odor level is reduced to 2.85 level after optimization.The product quality is superior to that of similar products in the market,meeting market demand.
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