Modification of the (SiO2/MgO/MgCl2)•TiCl x Ziegler-Natta polyethylene catalysts using the third metal elements

被引:7
作者
Fu, Ting [1 ]
Cheng, Rui-hua [1 ]
He, Xue-lian [1 ]
Liu, Zhen [1 ]
Tian, Zhou [1 ]
Liu, Bo-ping [1 ]
机构
[1] East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China
基金
中国国家自然科学基金;
关键词
Polyethylene; Ziegler-Natta polymerization; Copolymerization; Kinetics; ETHYLENE POLYMERIZATION REACTIONS; MOLECULAR-WEIGHT DISTRIBUTION; MIXED CATALYSTS; ETHYLENE/1-HEXENE; HYDROGEN; NICKEL; COPOLYMERIZATION; MECHANISM; SYSTEMS; HYBRID;
D O I
10.1007/s10118-017-1939-0
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Various (SiO2/MgO/MgCl2)center dot TiCl (x) Ziegler-Natta catalysts modified by the third metal elements were synthesized by the co-impregnation of water-soluble magnesium and the third metal salts. Several key factors including the electronegativity of the third metal elements, catalyst performances in ethylene homo-polymerization, ethylene/1-hexene copolymerization and hydrogen response were systematically investigated. Both the catalyst performance and the polymer properties are influenced by the introduction of the third metal elements. Compared with the unmodified (SiO2/MgO/MgCl2)center dot TiCl (x) Ziegler-Natta catalyst, activity and 1-hexene incorporation are enhanced by the introduction of zirconium, vanadium, aluminum and chromium, while deteriorated by the addition of ferrum, nickel, molybdenum and tungsten. Correlations of the catalyst activities and 1-hexene incorporation ability with the electronegativity of the third metal elements are discovered. It is found that the lower electronegativity of the third metal elements leads to the catalyst with higher activity and higher alpha-olefin co-polymerization ability. The polyethylene produced by a nickel modified catalyst showed broad molecular weight distribution (MWD) and the lowest average molecular weight (MW), while by using a ferrum modified catalyst, the resulting polyethylene had the highest MW, reaching the ultra-high MW area. Vanadium and chromium modified catalysts demonstrated the best hydrogen response.
引用
收藏
页码:739 / 751
页数:13
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