Manufacturing method of LLDPE polyethylene
I. Introduction
LLDPE polyethylene is a widely used raw material for the production of chemicals, which is widely used in the fields of plastic packaging, pipelines, wires and cables due to its excellent properties, such as chemical resistance, electrical insulation, low temperature toughness, and so on. This article will detail the manufacturing method of LLDPE polyethylene.
II. Manufacturing method
1. Catalyst preparation
The manufacture of LLDPE polyethylene requires the use of catalysts, usually Ziegler-Natta catalysts or chromium catalysts. The preparation process involves mixing the catalyst raw materials in a certain ratio, followed by steps such as grinding and drying.
2. Polymerization reaction
After the catalyst is prepared, it is added to the ethylene monomer to initiate the polymerization reaction. The polymerization reaction can be carried out in solution method, gas phase method or slurry method, different methods will affect the molecular structure and properties of LLDPE polyethylene.
3. Molecular Weight Adjustment
During the polymerization reaction, the molecular weight needs to be adjusted, e.g., by adding hydrogen, to obtain the desired molecular weight range and molecular weight distribution.
4. De-volatilization
After the polymerization reaction, de-volatilization is required to remove unreacted ethylene monomer and catalyst residues.
5. Pelletizing and Packaging
After the de-volatilization process, the LLDPE polyethylene needs to be pelletized for transportation and use. After granulation is completed, it is packed and stored in the warehouse.
3. Precautions
1. The selection and preparation of catalyst has a vital influence on the performance of LLDPE polyethylene, and it is necessary to select a suitable catalyst according to the use of the product.
2. The polymerization reaction process needs to strictly control the reaction conditions and molecular weight adjustment mode to obtain the ideal molecular structure and performance.
3. The de-volatilization treatment needs to be thorough to ensure the purity and quality of the product.
4. Conclusion
The manufacturing method of LLDPE polyethylene involves a number of links, and the process parameters and operation process of each step need to be strictly controlled to ensure the quality and performance of the product. Meanwhile, the selection and preparation of catalyst is also one of the key factors, which needs to be selected and optimized according to the actual situation. By mastering the manufacturing method of LLDPE polyethylene, it can provide high-quality raw materials for chemical production and promote the development of related industries.
