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

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The manufacturing method
of styrene butadiene rubber
1. Introduction

styrene butadiene rubber (SBR) is an important chemical product widely used in tires, footwear, plastic modification and other fields. Its superior performance and low price, so it has been widely used in the world. This article will introduce the manufacturing method of styrene-butadiene rubber in detail, 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 styrene-butadiene rubber, generally prepared by naphtha cracking or ethylene oxidation.
2. Styrene: Styrene is another major monomer of styrene-butadiene rubber, prepared by the reaction of ethylene and benzene.
3. initiator: commonly used initiator benzoyl peroxide, azobisisobutyronitrile and so on.
4. emulsifier: used for the preparation of emulsion, commonly used emulsifiers are sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, etc.

3. polymerization reaction

styrene-butadiene rubber polymerization reaction generally adopts emulsion polymerization method, including the following steps:

1. preparation of emulsion: monomer, initiator, emulsifier, etc. are added into water to prepare emulsion.
2. Polymerization: Under the action of the initiator, the monomer is polymerized in the emulsion to generate styrene butadiene rubber particles.
3. Cooling termination: The polymerization reaction was terminated by cooling to obtain a styrene-butadiene rubber emulsion.

4. Post-treatment

1. Agglomeration: An electrolyte is added to the emulsion to agglomerate the styrene-butadiene rubber particles into a solid.
2. Dewatering: use a centrifuge or press to remove the water after condensation.
3. Drying: The dehydrated styrene-butadiene rubber is dried in a drying oven to obtain a finished styrene-butadiene rubber.
Precautions for
5.

1. Strictly control the ratio of monomer, initiator, emulsifier, etc. to ensure the smooth progress of the polymerization reaction.
2. During the polymerization reaction, it is necessary to maintain an appropriate temperature and stirring speed to prevent local overheating and gel formation.
3. In the post-treatment process, the amount of electrolyte added and the conditions of dehydration and drying should be controlled to ensure the quality of the product.

6. environmental protection and safety production

1. Waste gas treatment: In the production process will produce some waste gas, such as unreacted monomer, initiator, etc., should be treated by absorption, adsorption and other methods to reduce environmental pollution.
2. Wastewater treatment: The wastewater generated during the production process should be discharged after being treated to meet the discharge standards to avoid adverse effects on the environment.
3. Safety protection: Some chemicals used in the production process have certain toxicity and corrosiveness. Safety training for operators should be strengthened to ensure safety in 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. At the same time, environmental protection and production safety are also issues that must be paid attention to in the manufacturing process, and effective measures should be taken to reduce environmental pollution and ensure production safety.

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