The difference between metallocene polyethylene and linear polyethylene
Auther： Read：497 Time：2021-07-01
Summary：Metallocene polyethylene is the latest generation of polyethylene products. Compared with traditional PE materials, metallocene polyethylene has a narrower molecular weight distribution and regular molecular chain structure, which is
Metallocene polyethylene is the latest generation of polyethylene products. Compared with traditional PE materials, metallocene polyethylene has a narrower molecular weight distribution and regular molecular chain structure, which is reflected in product performance. Metallocene polyethylene has high mechanical strength and good optical properties. .
According to the classification of density, metallocene polyethylene can be divided into elastomer, plastomer, m-VLDPE, m-LLDPE, m-MDPE, m-HDPE. In recent years, metallocene polyethylene has been recognized by downstream users whether it is used for films, pipes, and other fields.
In the past two years, domestic agricultural film, packaging film and other industries have paid more and more attention to metallocene linearity. Some customers are not familiar with metallocene and have certain doubts about the alternative of metallocene linearity and traditional LLDPE/LDPE. Metallocene polyethylene is a new type of thermoplastic. It is a linear polyethylene produced by using metallocene (MAO) as a polymerization catalyst. Its performance is significantly different from LLDPE polymerized by traditional Ziegler-Natta catalysts.
The m-LLDPE film grade has a lower melting point and obvious melting zone, and is significantly better than traditional linear polyethylene in terms of toughness, transparency, hot tack, heat sealing temperature, and low odor. The common domestic LLDPE is mainly used in the production of film, such as packaging film, agricultural film, lining bag, etc. The application range of m-LLDPE is also mainly concentrated in the production of films, such as food packaging, stretch stretch film, heavy packaging bags, solid packaging materials, agricultural films and other fields. As an extremely important application of m-LLDPE, film mainly includes food packaging film, stretch stretch film, heavy packaging film, solid packaging materials, etc. Among them, packaging film (including food packaging, non-food packaging, and heavy packaging bags) is the largest application field. EZP and HPR catalysts are two series of metallocene polyethylene products produced by UNIPOL process.
The process and development of the localization of metallocene polyethylene:
The development of metallocene polyolefins depends on the improvement of metallocene catalysts and large-scale industrial production. In 1991, Exxon Mobil of the United States first industrialized the production of metallocene polyethylene, followed by DOW Chemical Company, Hoechst Company, Fina, BASF and other companies. The production of metal catalysts for industrial polymerization of polyolefins. In recent years, my country has also increased its research and development of metallocene catalysts. Sinopec has been committed to the research of metallocene catalysts and metallocene-catalyzed polyolefins, and has developed metallocene polymerization technology with independent intellectual property rights. At present, Qilu Petrochemical's PE-RT products QHM22F/QHM32F and metallocene membrane products F3306S/2703/2706/181ZR and other metallocene hexene copolymer products have been widely recognized by the market and occupy a considerable market share.