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The manufacturing method of styrene butadiene rubber (SBR) is an important chemical widely used in the fields of tires, footwear, plastic modification, etc. Its superior performance and low price have made it widely used worldwide. This article will provide a detailed introduction to the manufacturing method of styrene butadiene rubber, including raw material preparation, polymerization reaction, post-treatment, and other processes

2、 Raw material preparation 

1 Butadiene: Butadiene is one of the main monomers of butadiene styrene rubber, usually obtained through naphtha cracking or ethylene oxidation

2. Styrene: Styrene is another major monomer of butadiene styrene rubber, produced by the reaction of ethylene and benzene

3. Initiating agents: Commonly used initiators include benzoyl peroxide, azodiisobutyronitrile, etc

4. Emulsifier: It is used to prepare lotion. Common emulsifiers include sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, etc

3、 Polymerization 

The polymerization of styrene butadiene rubber generally adopts the lotion polymerization method, including the following steps: 

1 Preparation of lotion: add monomer, initiator, emulsifier, etc. into water to prepare lotion

2. Polymerization reaction: under the action of initiator, monomer polymerizes in lotion to generate styrene butadiene rubber particles

3. Cooling termination: the polymerization reaction is terminated by cooling to obtain styrene butadiene rubber lotion

4、 Post processing 

1 Coagulation: add electrolyte to lotion to agglomerate styrene butadiene rubber particles into solids

2. Dehydration: Use a centrifuge or press to remove condensed water

3. Drying: Dry the dehydrated butadiene styrene rubber in a drying oven to obtain the finished product

5、 Notes 

1 Strictly control the proportion of monomers, initiators, emulsifiers, etc. to ensure the smooth progress of polymerization reactions

2. In the process of polymerization, appropriate temperature and stirring speed shall be maintained to prevent local overheating and gel formation

During the post-treatment process, the amount of electrolyte added and the conditions for dehydration and drying should be well controlled to ensure product quality

6、 Environmental protection and safety production 

1 Waste gas treatment: During the production process, some waste gases, such as unreacted monomers and initiators, should be treated through absorption, adsorption and other methods to reduce environmental pollution

2. Wastewater treatment: The wastewater generated during the production process should be treated to meet the discharge standards before being discharged to avoid adverse effects on the environment

3. Safety protection: Some chemicals used in the production process have certain toxicity and corrosiveness, and safety training for operators should be strengthened to ensure safety during the production process

7、 Conclusion: The manufacturing method of styrene butadiene rubber involves multiple processes and precautions. Only under strict control of each process can high-quality styrene butadiene rubber be produced. Meanwhile, environmental protection and safety production are also issues that must be taken seriously in the manufacturing process. Effective measures should be taken to reduce environmental pollution and ensure production safety.