丙烯聚合化学改性的负载型高效催化剂的研究 (Ⅱ)催化剂的性能和聚合产物的性质与表征

Study Of Chemical Modification of Supported Titanium Catalyst for Propylene Polymerization (Ⅱ) The Polymerization and Characterization of the Products

研究了化学改性的负载型高效催化剂的性能。该催化剂含钛化合物、MgCl_2、硅化合物、酯、烷基铝等组分,在常压下反应1.5h,催化效率为4～8kgPP/g Ti,产品等规度可在90％～97％范围内调节。详细考察了聚合反应条件对催化效率、产品等规度的影响,用偏光显微镜、广角X-射线衍射、红外光谱以及热谱分析对聚合产物结构性质进行表征,表明是一种良好的等规PP。还讨论了催化剂的生产应用前景。

The chemically modified catalyst, comprising Titanium compound, magnesium chloride, silicon compound, Lewis base and AIR_3 has been investigated. The efficiency was 4～8kgPP/gTi/1.5h at ordinary pressure, tacticity being ajustable within 90%～97%. The influences of various polymerization conditions on catalytic efficiencies of propylene and PP tacticity were examined.The polypropylene prepared with chemically modified catalyst was indentified as well defined isotactic PP by X-ray diffraction, IR, and thermo analysis techniques. The new type of catalyst is of great significance for the industrial development of polypropylene.