Modification of the (SiO2/MgO/MgCl2)·TiClx Ziegler-Natta Polyethylene Catalysts Using the Third Metal Elements

Citation: Ting Fu, Rui-hua Cheng, Xue-lian He, Zhen Liu, Zhou Tian, Bo-ping Liu. Modification of the (SiO₂/MgO/MgCl₂)·TiCl_x Ziegler-Natta Polyethylene Catalysts Using the Third Metal Elements[J]. Chinese Journal of Polymer Science, 2017, 35(6): 739-751. doi: 10.1007/s10118-017-1939-0 shu

Modification of the (SiO₂/MgO/MgCl₂)·TiCl_x Ziegler-Natta Polyethylene Catalysts Using the Third Metal Elements

通讯作者: , rhcheng@ecust.edu.cn
, boping@ecust.edu.cn

English

Modification of the (SiO₂/MgO/MgCl₂)·TiCl_x Ziegler-Natta Polyethylene Catalysts Using the Third Metal Elements

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

Corresponding author: Rui-hua Cheng, rhcheng@ecust.edu.cn Bo-ping Liu, boping@ecust.edu.cn

Received Date: 27 October 2016
Accepted Date: 28 November 2016
Revised Date: 26 November 2016
Available Online: 05 June 2017
Fund Project:

Abstract: Various (SiO₂/MgO/MgCl₂)·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)·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 a-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.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

Modification of the (SiO₂/MgO/MgCl₂)·TiCl_x Ziegler-Natta Polyethylene Catalysts Using the Third Metal Elements

通讯作者: , rhcheng@ecust.edu.cn
, boping@ecust.edu.cn

English

Modification of the (SiO₂/MgO/MgCl₂)·TiCl_x Ziegler-Natta Polyethylene Catalysts Using the Third Metal Elements

Corresponding author: Rui-hua Cheng, rhcheng@ecust.edu.cn Bo-ping Liu, boping@ecust.edu.cn

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