Ziegler-Natta/茂金属复合催化剂制备双峰聚乙烯

通过把茂金属催化剂负载在Ziegler-Natta催化剂上制备了ZM复合催化剂，在单一聚合反应器内研究了ZM催化剂用于乙烯聚合制备双峰聚乙烯的性能。考察了催化剂中茂金属化合物的含量、聚合过程中反应温度、助催化剂的用量和共聚单体1-己烯的用量对催化剂乙烯聚合性能的影响规律。结果表明：采用ZM催化剂可以在单反应器内催化乙烯聚合得到分子量分布呈双峰的聚乙烯，聚乙烯的分子量分布达到155，聚合活性可达2.52×10⁷ g/molMt·h。

Preparation of polyethylene with bimodal distribution catalyzed by complex catalyst of Ziegler-Natta with metallocene

ZM complex catalyst was prepared by impregnating metallocene catalyst on supported Ziegler-Natta catalyst, its catalytic performance in ethylene polymerization toward bimodal polyethylene in a single reactor was investigated. The influence of the amount of metallocene, polymerization temperature, the amount of co-catalyst and 1-hexene on the catalytic activity was studied. The complex catalyst exhibits high catalytic activity for ethylene polymerization, and the MI values of the polymers are obviously relevant to the polymerization temperature, the mol ratio of Al/M and 1-hexene content in feed. The structure and properties of the obtained polymers were characterized by GPC and FT-IR, which revealed that the polymers featured bimodal distribution with MWD at the range of 18 to 155, and the incorporation of 1-hexene within the polymer chain increased with the increase of the co-monomer content in feed.