Studies Of Qilu High Fluidity Impact Polypropylene Copolymer

High fluidity impact polypropylene copolymer,widely used in the fields such as automobiles, electric appliances and packaging, have good performances of rigidity, toughness and fluidity. There are three ways to produce it: modulate hydrogen concentration during polymeration ,adopt new initiator with hydrogen modulation,or control degradation with peroxide. The last method is also called controlled-rheology method,the product has a short name of controlled-rheology impact polypropylene copolymer (CRIPC). Limited by the short supply of hydrogen from hydrogen pump and the low design-pressure of circumfused pipes, high fluidity impact polypropylene copolymer products can not be manufactured from polypropylene equipments of SINOPEC Qilu.Co.Ltd. So this research was implemented to design the manufacturing procedure of controlled–rheology method, and to investigate the structure and behaviors of CRIPC. The result shows that, QP73N is suitable to be basic resin, and primary material made from peroxides C is the best peroxide. The extrusion temperature is the most important factor that influences the fluidity of degraded products. Other factors can be sequenced as the material feeding rotation speed and the screw rotation speed. At each fixed extrusion temperature, the less the ratio between the materials feeding rotation speed and the screw rotation speed is, the higher the MFR is. Higher temperature and longer setting time do the favor of the leftover of peroxides, but excessive setting time will promote the congregation of latex phase. Stabilization additives have influences on the properties of the degradation products. After degradation, molecular weight of the impact propylene copolymer falls, distribution becomes narrow, fluidity increases, rigidity and toughness falls, crystallization degree increases appreciably. On the contrary, complex viscosity increases at low frequency band after excessive degradation.