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

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The manufacturing method
of SIS rubber
SIS rubber (styrene-isoprene-styrene triblock copolymer) is an important chemical production raw material, widely used in the manufacture of hot melt adhesive, pressure sensitive adhesive, rubber modifier and other fields. A manufacturing method of the SIS rubber will be described below.

1. raw material preparation

1. Styrene (St): industrial grade, purity ≥ 99%.
2. Isoprene (Ip): industrial grade, purity ≥ 98%.
3. Initiator: Organic peroxides such as benzoyl peroxide (BPO) are commonly used.
4. Solvent: Toluene or petroleum ether is usually used to adjust the viscosity of the reaction system.

2. Manufacturing Process
The manufacture of
SIS rubber adopts a solution polymerization method, which includes the following steps:

1. ingredients: according to a predetermined formula, styrene, isoprene, initiator and solvent are added to the reaction kettle.
2. Stirring and heating: Turn on the stirrer to fully mix the reaction materials while heating the reactor to a predetermined temperature.
3. Initiating polymerization: When the temperature in the reaction kettle reaches a predetermined value, an initiator is added to initiate the polymerization reaction.
4. Constant temperature reaction: At a constant temperature, let the reaction proceed for a period of time to ensure the full growth of the SIS rubber molecular chain.
5. Post-treatment: After the reaction, the reaction product is subjected to post-treatment operations such as devolatilization, filtration, washing and drying to obtain a finished SIS rubber product.
Precautions for
3.

1. Strictly control the reaction temperature and time to ensure that the structure and molecular weight distribution of the SIS rubber molecular chain meet the requirements.
2. Prevent oxygen from entering the reaction system to avoid the initiator reacting with oxygen and affecting the polymerization effect.
3. In the post-treatment process, ensure that the solvent is completely removed, so as not to affect the performance of SIS rubber.

4. Quality Control

In order to ensure the stable quality of SIS rubber, it is necessary to comprehensively monitor the production process, including key indicators such as raw material quality, reaction conditions, molecular weight distribution, and Mooney viscosity. At the same time, it is also necessary to test the performance of the finished product, such as tensile strength, tear strength, aging resistance, etc., to ensure that the product meets relevant standards and customer requirements.

In short, the manufacture of SIS rubber requires strict control of raw material quality, reaction conditions and post-treatment processes to ensure stable product quality and performance. At the same time, it is also necessary to strengthen the monitoring and quality control of the production process to ensure that the products meet the relevant standards and customer requirements, and provide high-quality raw materials for the chemical production field.

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