Manufacturing method of metallocene polyethylene
Metallocene polyethylene (mPE) is a high-performance polyethylene, which is widely used in the field of raw materials for chemical production due to its unique molecular structure and performance characteristics. This article will introduce the manufacturing method of metallocene polyethylene in detail.
I. Raw material preparation
The main raw materials for manufacturing metallocene polyethylene are ethylene and metallocene catalyst. Among them, ethylene is the monomer of polyethylene, and metallocene catalyst is the key to control the molecular structure and properties of polyethylene.
Two, catalyst preparation
The preparation of metallocene catalyst is an important link in the manufacture of metallocene polyethylene. Generally speaking, metallocene catalyst consists of metallocene compound and co-catalyst. In the preparation process, metallocene compounds and co-catalysts need to be mixed in a certain proportion and reacted under specific conditions to generate metallocene catalysts with catalytic activity.
Third, polymerization reaction
After the metallocene catalyst is prepared, it is added into the polymerization reactor together with the ethylene monomer to carry out the polymerization reaction. During the polymerization reaction, the metallocene catalyst will control the polymerization speed and mode of the ethylene monomer to produce metallocene polyethylene with specific molecular structure and properties. After the polymerization reaction, the metallocene polyethylene needs to be post-treated. Generally speaking, post-treatment includes catalyst removal, product granulation and packaging. The treatment of these links will affect the final quality and performance of metallocene polyethylene.
V. Quality control
In the process of manufacturing metallocene polyethylene, it is necessary to carry out strict quality control of each link to ensure that the quality and performance of the product meet the requirements. The quality control includes the quality of raw materials, the activity of catalyst, the conditions of polymerization reaction and the way of post-treatment.
In conclusion, the manufacturing method of metallocene polyethylene involves a number of links and factors, and it is necessary to strictly control the process parameters and quality indexes of each link in order to manufacture high-quality metallocene polyethylene products. At the same time, with the continuous progress of technology and application requirements, the manufacturing methods of metallocene polyethylene will be constantly updated and improved.
