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Exploring Si/Mg composite supported Ziegler-Natta Ti-based catalysts for propylene polymerization

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Abstract

A series of (SiO2/MgO/ID/MgCl2)·TiCl x Ziegler-Natta catalysts for propylene polymerization has been prepared with a new method. These catalysts were synthesized using soluble Mg-compounds as the Mg-source and the preparation progress was relatively simple. The catalyst could copy the spherical shape of the carrier very well. The propylene polymerization results showed that the catalyst revealed the best activity with 9,9-di(methoxymethyl)fluorene (BMMF) as internal donor at 50 °C with the optimal molar ratio Al/Ti = 5, which was much lower than what the industrial polypropylene catalyst used (at least molar ratio Al/Ti = 100), resulting in great cost saving. Additionally, the polymerization kinetics of the catalyst exhibited very stable property after achieving a relatively high value. These catalysts possessed rather high activity and good hydrogen response. The isotactic index (II.) value of the PP products could be higher than 98% in the presence of both internal and external electron donors. Moreover, temperature rising elution fractionation method was used to understand the influence of donors and H2 on the properties of the PP products.

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Authors and Affiliations

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

    Wei Zhu, Rui-hua Cheng, Xue-lian He, Zhen Liu, Ning Zhao & Bo-ping Liu  (刘柏平)

  2. Key Laboratory of Advanced Control and Optimization for Chemical Processes, Ministry of Education, East China University of Science and Technology, Shanghai, 200237, China

    Zhou Tian  (田洲)

Authors
  1. Wei Zhu
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  2. Zhou Tian  (田洲)
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  3. Rui-hua Cheng
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  4. Xue-lian He
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  5. Zhen Liu
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  6. Ning Zhao
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  7. Bo-ping Liu  (刘柏平)
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Corresponding authors

Correspondence to Zhou Tian  (田洲) or Bo-ping Liu  (刘柏平).

Additional information

This work was financially supported by the National Natural Science Foundation of China (Nos. 21406061 and 21674036), the Major State Basic Research Development Program of China (2014CB239503) and the Fundamental Research Funds for the Central Universities.

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Zhu, W., Tian, Z., Cheng, Rh. et al. Exploring Si/Mg composite supported Ziegler-Natta Ti-based catalysts for propylene polymerization. Chin J Polym Sci 35, 1474–1487 (2017). https://doi.org/10.1007/s10118-017-1999-1

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  • DOI: https://doi.org/10.1007/s10118-017-1999-1

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