嵌段共聚聚丙烯EP548N的开发

Development of block copolypropylene EP548N

采用Spheripol工艺开发生产了中等熔体流动速率、高弯曲模量、高抗冲击性能的嵌段共聚聚丙烯EP548N。生产过程中调整第一环管反应器中H2浓度为4.3～4.5 kg/kg,控制气相反应器中n(C2H4)/n(C2H4+C3H6)为0.38,n(H2)/n(C2H4)为0.05～0.07,采用新型外给电子体二环戊基二甲氧基硅烷,所产EP548N的熔体流动速率达12.5g/10 min,弯曲模量达到1 290 MPa,简支梁缺口冲击强度为10.3 kJ/m2,均高于同类产品。

The block copolypropylene with medium melt flow rate, high flexural modulus and impact strength, EP548N, was produced in Spheripol process. The block copolymer had melt flow rate of 12.5 g/10 min, flexural modulus up to 1290 MPa and notched Charpy impact strength of 10.3 MPa, higher than those of its counterparts, when setting the hydrogen concentration in the first loop reactor at 4.3-4.5 kg/kg, controlling the molar ratio of C2H4 to C2H,＋C3H6 at 0.38 and H2 to C2H4 at 0.05-0.07 in the gas phase reactor, adopting dicycol-pentyl dimethoxy silane as a novel external electron donor during the production.