Preparing supported metallocene catalysts and applying in production of polyethylene with wide molecular weight distribution

化学工业与工程

Chemcial Industry and Engineering

2024, Vol. 41

Issue (6) :42-49 DOI: 10.13353/j.issn.1004.9533.20230828

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Preparing supported metallocene catalysts and applying in production of polyethylene with wide molecular weight distribution

GU Yongyao¹, WANG Lijuan², JIANG Tao¹, LI Jian¹

1. College of Chemical Engineering and Materials Science, Tianjin University of Science & Technology, Tianjin 300457, China;
2. Daqing Chemical Research Center, Petrochemical Research Institute, China National Petroleum Corporation, Heilongjiang, Daqing 163714, China

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Abstract Metallocene polyethylene has superior properties, but its molecular weight distribution is usually narrow, which will bring a series of problems such as difficulties in subsequent molding and processing, and limit its large-scale application. In this study, a supported metallocene catalyst was obtained by using methylaluminoxane (MAO)-modified silica gel as a carrier and metallocene compound as the active component, and metallocene polyethylene was obtained by catalyzing ethylene polymerization in a slurry system. The effects of preparation conditions on loading and polymerization conditions on activity were systematically investigated, and the catalysts and polymerization products were analyzed and characterized by scanning electron microscopy, inductively coupled plasma mass spectrometry, laser particle size analyzer, and high-temperature gel permeation chromatography. The experimental results showed that the activity release of the supported catalyst was moderate, and the activity of the supported catalyst could reach 1 576.5 g·g^-1. After the addition of 1-hexene, the processing properties of the product were improved, the melting point, density, bulk density and crystallinity of the polymer became lower, the molecular weight distribution was broadened from 2.6 to 3.2, and the melt flow rate increased from 0.088 2 to 0.36 g·min^-1.

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	GU Yongyao
	WANG Lijuan
	JIANG Tao
	LI Jian

Keywords： metallocene catalysts silica gel slurry polymerization molecular weight distribution

Received 2023-12-06;

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GU Yongyao, WANG Lijuan, JIANG Tao, LI Jian.Preparing supported metallocene catalysts and applying in production of polyethylene with wide molecular weight distribution[J] Chemcial Industry and Engineering, 2024,V41(6): 42-49

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