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[Chemical Knowledge]：The manufacturing method and process of SIS.

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SIS (styrene-isoprene-styrene) terpolymer is an important raw material for chemical production, which is widely used in rubber, plastics, adhesives and other fields. A manufacturing method of the SIS will be described below.

1. Raw Material Preparation

1. Styrene: Styrene is one of the main components of SIS, used to provide hardness and rigidity.
2. Isoprene: Isoprene is another major component in SIS and is used to provide elasticity and flexibility.
3. Initiator: used to initiate monomer polymerization. Commonly used initiators are benzoyl peroxide, azobisisobutyronitrile, etc.
4. solvent: used to adjust the viscosity of the polymerization reaction system, commonly used solvents such as toluene, ethylbenzene.

2. Manufacturing Process

1. Ingredients: Styrene, isoprene, initiator and solvent are added to the polymerization reactor according to a predetermined ratio.
2. Polymerization: At appropriate temperature and pressure, the initiator decomposes to generate free radicals that initiate polymerization of the monomers. The polymerization reaction can be divided into three stages: the initiation period, the growth period and the termination period.
3. Post-treatment: After the polymerization reaction is completed, post-treatment processes such as degassing, devolatilization, extrusion and granulation are performed to obtain a finished SIS product.
Precautions for
3.

1. Strictly control the temperature and pressure of the polymerization reaction to ensure the smooth progress of the reaction.
2. The type and dosage of the initiator have a great influence on the speed of the polymerization reaction and the molecular weight of the product, and need to be adjusted according to the actual situation.
3. In the post-processing process, it is necessary to ensure the quality and stable performance of the product.

4. application field

SIS as an important chemical production raw material, widely used in the following fields:

1. rubber products: SIS can be used in the production of tires, rubber hose, tape and other rubber products, improve the wear resistance, crack resistance and elasticity of products.
2. Plastic products: SIS can be used to produce plastic modifiers, toughening agents, etc., to improve the toughness and impact resistance of plastic products.
3. Adhesive: SIS can be used as the basic component of the adhesive to improve the adhesion and weather resistance of the adhesive.

In short, the manufacturing method of SIS involves multiple links and precautions, and it is necessary to strictly control the process parameters and quality indicators of each process to ensure product quality and stable performance. At the same time, SIS, as an important raw material for chemical production, has a wide range of applications in the fields of rubber, plastics and adhesives.

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