BCE型催化剂的共聚合性能

Copolymerization performances of the BCE catalyst

采用分光光度计、粒径分析仪等表征了BCE型催化剂的组成、粒径和形态等;采用核磁共振仪、高温凝胶渗透色谱仪等研究了催化剂的共聚合性能,并与参比催化剂进行了比较。结果表明:BCE型催化剂的聚合活性达16.6 kg/(g·h),较参比催化剂高约8%;所制聚乙烯(PE)的堆密度为0.34 g/cm3,粒径≥75~830μm的粉料质量占PE总质量的97.2%;BCE型催化剂的共聚合性能更好,用其催化乙烯和1-丁烯共聚合时,有更多的1-丁烯插入到高相对分子质量部分,有利于提升所制管材的力学性能。

The composition, particle size and morphology of BCE catalyst were characterized by means of spectrophotometer and particle size analyzer. The copolymerization performances of BCE catalyst and reference catalyst were studied by using nuclear magnetic resonance spectrometer and high temperature gel permeation chromatography. The results show that the activity of BCE catalyst reaches 16.6 kg/(g·h) which is 8% higher than that of the reference catalyst. The bulk density of the resultant PE is 0.34 g/cm3 and the mass fraction of the powders with particle size of 75-830μm is about 97.2%.The performances of BCE catalyst for ethylene and 1-butene copolymerization are better than those of the reference catalyst,and more 1-butene molecules are added to the high relative molecular mass part,which is beneficial to improve the mechanical property of the pipe.