预聚除能够提高催化剂的活性外，对提高聚丙烯粉料的表观密度和等规指数、减少聚丙烯颗粒的破碎有显著影响。

Besides increasing the catalyst activity, the pre-polymerization can not only raise the bulk density and isotacticity of the PP product, but also significantly diminish the cracking of the PP powders.

youdao

预聚除能够提高催化剂的活性外，对提高聚丙烯粉料的表观密度和等规指数、减少聚丙烯颗粒的破碎有显著影响。

Besides increasing the catalyst activity, the pre-polymerization can not only raise the bulk density and isotacticity of the PP product, but also significantly diminish the cracking of the PP powders.

youdao