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以聚乙烯和聚丙烯为代表的聚烯烃材料是当今社会不可缺少的通用材料,而聚乙烯作为通用塑料中产量最大的品种,近十年来年增长率达到6.3%,在国民生产中占有非常重要的地位。在催化体系方面,20世纪70年代,我国就开始了齐格勒-纳塔催化剂的研究,经过多年的努力,目前在齐格勒-纳塔研究和应用方面占据了一席之地。由于茂金属催化剂和非茂金属催化剂活性中心单一,能精准地控制聚合,目前茂金属催化剂和后过渡金属催化剂都在研究开发中。文章还阐述了聚乙烯的生产工艺,分析了聚乙烯的工业现状。从市场情况看,双峰聚乙烯,m LLDPE,POE,PERT等产品备受青睐,预示着聚乙烯有着广泛的发展前景。
The polyolefin material represented by polyethylene and polypropylene is an indispensable common material in our society. As the most widely used variety of general plastics, polyethylene has a 6.3% annual growth rate in recent ten years and is very important in national production Position. In the catalytic system, 70 years in the 20th century, China began the Ziegler - Natta catalyst research, after years of efforts, at present Zigler - Natta occupy a place in the research and application. Because metallocene catalysts and non-metallocene catalysts have a single active center and can control polymerization accurately, both metallocene catalysts and post-transition metal catalysts are currently under development. The article also expounds the production technology of polyethylene and analyzes the industrial status of polyethylene. From the market situation, bimodal polyethylene, m LLDPE, POE, PERT and other products are favored, indicating that polyethylene has a wide range of development prospects.