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[Chemical Knowledge]：Manufacturing method and process flow of LLDPE polyethylene

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LLDPE polyethylene manufacturing method

1. Introduction

LLDPE polyethylene is a widely used chemical production raw materials, because of its excellent performance, such as chemical corrosion resistance, electrical insulation, low temperature toughness, is widely used in plastic packaging, pipes, wire and cable and other fields. This article will introduce the manufacturing method of LLDPE polyethylene in detail.

2. Manufacturing Methods

1. Catalyst Preparation

The production of LLDPE polyethylene requires the use of a catalyst, usually a Ziegler-Natta catalyst or a chromium-based catalyst. The preparation process needs to mix the catalyst raw materials according to a certain proportion, and then grind, dry and other steps.

2. Polymerization

After the catalyst is prepared, it is added to ethylene monomer to initiate polymerization. The polymerization reaction can be carried out in a solution process, a gas phase process, or a slurry process, and the different processes can affect the molecular structure and properties of the LLDPE polyethylene.

3. Molecular Weight Adjustment

During the polymerization reaction, it is necessary to adjust the molecular weight by adding hydrogen or the like to obtain a desired molecular weight range and molecular weight distribution.

4. Devolatilization Treatment
After completion of the
polymerization reaction, devolatilization treatment is required to remove unreacted ethylene monomer and catalyst residue.

5. Pelletizing and packaging

The devolatilized LLDPE polyethylene needs to be pelletized for transportation and use. After the completion of granulation, packaging, storage preservation.

3. Precautions

1. The selection and preparation of catalysts have a vital influence on the performance of LLDPE polyethylene, and it is necessary to select the appropriate catalyst according to the product use.

2. The reaction conditions and molecular weight adjustment methods need to be strictly controlled during the polymerization reaction to obtain the ideal molecular structure and performance.

3. The devolatilization treatment needs to be thorough to ensure the purity and quality of the product.

4. Conclusion The manufacturing method of

LLDPE polyethylene involves many links, and it is necessary to strictly control the process parameters and operation process of each step to ensure the quality and performance of the product. At the same time, the selection and preparation of the 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.

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