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The manufacturing method of solution polymerized styrene butadiene rubber (SSBR) is a high-performance synthetic rubber with excellent wear resistance, wet slip resistance, and low rolling resistance. It is widely used in fields such as tires, shoe materials, and plastic modification. This article will provide a detailed introduction to 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 significant impact on the final product quality. Generally, purity is required to be above 99.5%

2. Styrene: As another monomer, styrene undergoes copolymerization reaction with butadiene. The purity requirement is above 99.9%

3. Solvent: Used to dissolve monomers and polymers, usually organic solvents such as cyclohexane and toluene are selected

4. Initiating agent: Used to initiate monomer polymerization reactions, commonly used are alkyl lithium compounds

2、 Manufacturing process 

1 Ingredients: According to the predetermined formula, add butadiene, styrene, solvent, and initiator to the ingredient kettle and stir thoroughly

2. Polymerization reaction: Transfer the mixture from the ingredient kettle into the polymerization reactor and carry out the polymerization reaction at a certain temperature and pressure. Strict control of temperature and pressure is required during the reaction process to ensure the smooth progress of the reaction

3. Post treatment: After the polymerization reaction is completed, the polymer solution is degassed and dehydrated to remove low molecular by-products

4. Coagulation: Adding a coagulant to a polymer solution to precipitate the polymer and separate it from the solvent

5. Drying: Dry the condensed polymer to remove residual moisture and solvents

6. Mixing: As needed, the dried polymer can be mixed with other additives to improve its processing and usability

3、 Quality Control 

1 Molecular weight control: By adjusting the amount of initiator and reaction temperature, the molecular weight and molecular weight distribution of the polymer can be controlled

2. Mooney viscosity: Mooney viscosity is an important indicator for measuring 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 significant impact on the performance of solution polymerized styrene butadiene rubber, which needs to be controlled by selecting appropriate monomer ratios and polymerization conditions

4、 Environmental protection and safety production 

1 Waste gas treatment: During the production process, some harmful gases will be generated and need to be purified to ensure compliance with emission standards

2. Wastewater treatment: Wastewater from the production process needs to be treated to meet environmental requirements

3. Safety protection: During the production process, strict adherence to safety operating procedures is required to ensure the safety of employees and equipment

In summary, the manufacturing process of solution polymerized styrene butadiene rubber requires strict control of various process parameters to ensure product quality and environmental safety. Meanwhile, with the continuous development of technology, it is also necessary to continuously optimize production processes, improve production efficiency, and reduce costs to meet market demand.