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[Chemical Knowledge]：Production and manufacturing method and process flow of solution-polymerized styrene-butadiene rubber

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Manufacturing method
of solution polymerized styrene butadiene rubber (SSBR)
solution polymerized styrene butadiene rubber (SSBR) is a kind of high-performance synthetic rubber, which has excellent wear resistance, wet skid resistance and low rolling resistance. It is widely used in tire, shoe material, plastic modification and other fields. This article will detail the manufacturing method of solution polymerized styrene-butadiene rubber.

1. Raw material preparation

1. Butadiene: As the main monomer of SSBR, the quality of butadiene has a great influence on the quality of the final product. Generally, the purity is above 99.5%.
2. Styrene: As another monomer, styrene is copolymerized with butadiene. The purity is required to be above 99.9%.
3. Solvent: For dissolving monomers and polymers, organic solvents such as cyclohexane and toluene are usually selected.
4. Initiator: Used to initiate the polymerization of monomers, alkyl lithium compounds are commonly used.

2. manufacturing process

1. ingredients: according to the predetermined formula, the butadiene, styrene, solvent and initiator into the ingredients kettle, fully stirred.
2. Polymerization: The mixture in the batching kettle is transferred to the polymerization reactor, and the polymerization reaction is carried out at a certain temperature and pressure. The temperature and pressure need to be strictly controlled during the reaction to ensure the smooth progress of the reaction.
3. Post-treatment: After the completion of the polymerization reaction, the polymer solution is degassed and dehydrated to remove the low molecular by-products.
4. Coagulation: A coagulant is added to the polymer solution to precipitate the polymer and separate it from the solvent.
5. Drying: The coagulated polymer is dried to remove residual moisture and solvent.
6. Mixing: According to needs, the dried polymer can be mixed with other additives to improve its processing performance and use performance.

3. quality control

1. molecular weight control: by adjusting the amount of initiator and reaction temperature, can control the polymer molecular weight and molecular weight distribution.
2. Mooney viscosity: Mooney viscosity is an important index to measure the processing performance of solution polymerized styrene butadiene rubber, which needs to be controlled by adjusting the polymerization process parameters.
3. Unsaturation: Unsaturation has a great influence on the performance of solution-polymerized styrene-butadiene rubber, which needs to be controlled by selecting the appropriate monomer ratio and polymerization conditions.

4. environmental protection and safety production

1. Exhaust gas treatment: Some harmful gases will be produced during the production process, which need to be purified to ensure that the emission standards are met.
2. Wastewater treatment: The wastewater in the production process needs to be treated to meet environmental protection requirements.
3. Safety protection: strictly abide by the safety operation procedures in the production process to ensure the safety of employees and equipment.

In short, the manufacturing process of solution polymerized styrene butadiene rubber requires strict control of various process parameters to ensure product quality and environmental protection and safety. At the same time, with the continuous development of science and technology, it is also necessary to continuously optimize the production process, improve production efficiency and reduce costs to meet the needs of the market.

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