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The manufacturing method of ABS/AS polymers 

1. Introduction 

ABS (acrylonitrile butadiene styrene copolymer) and AS (acrylonitrile styrene copolymer) polymers are important materials in the field of chemical production raw materials, with excellent physical properties and chemical stability, and are widely used in fields such as automobiles, electronics, construction, and home appliances. This article will provide a detailed introduction to the manufacturing methods of ABS/AS polymers

2、 Manufacturing method 

1 Lotion polymerization 

lotion polymerization is the main method to produce ABS/AS polymer. In this method, styrene, acrylonitrile and butadiene are used as monomers, water is used as medium, emulsifier and initiator are added, and lotion polymerization is carried out under stirring. During the polymerization process, monomers aggregate in micelles to form particles, which continuously grow and eventually condense into polymers. This method can obtain polymer particles with uniform particle size distribution and high molecular weight

2. Suspension polymerization method 

Suspension polymerization method is also one of the methods for producing ABS/AS polymers. This method uses styrene, acrylonitrile, and butadiene as monomers, water as the medium, suspension agents and initiators are added, and suspension polymerization is carried out under stirring. During the polymerization process, monomers polymerize in suspension to form particles and gradually grow into polymers. This method can obtain polymer particles with large particle size and wide particle size distribution

3. Solution polymerization method 

Solution polymerization method is one of the methods for producing AS polymers. This method uses styrene and acrylonitrile as monomers, organic solvents as media, and initiators for solution polymerization. During the polymerization process, monomers polymerize in solution to form polymer chains, resulting in an AS polymer solution. This method can obtain AS polymers with high molecular weight and low viscosity

3、 Manufacturing process 

1 Monomer preparation: Mix styrene, acrylonitrile, and butadiene in a certain proportion to prepare the desired monomer mixture

2. Polymerization reaction 

Add the monomer mixture to the reactor, add initiators and emulsifiers or suspensions, and carry out the polymerization reaction under stirring. The reaction temperature and pressure are determined by specific process conditions, and it is generally necessary to control the reaction temperature within a certain range to ensure the smooth progress of the polymerization reaction

3. After the polymerization reaction is completed, post-treatment is required, including steps such as demulsification, washing, drying, etc., to obtain pure ABS/AS polymer. The specific post-treatment process may vary depending on the polymerization method and product requirements

4、 Notes 

1 The monomer ratio and feeding sequence have a significant impact on the performance and yield of polymers, and optimization is needed based on specific product requirements

During the polymerization reaction process, strict control of temperature and pressure is required to ensure the smooth progress of the reaction and the quality of the product

During the post-processing process, attention should be paid to the operating conditions of steps such as demulsification, washing, and drying to avoid a decrease in product quality

5、 Conclusion 

ABS/AS polymer manufacturing methods include lotion polymerization, suspension polymerization, solution polymerization and other methods. The specific method selection needs to be comprehensively considered according to product requirements and process conditions. In the manufacturing process, it is necessary to strictly control various process parameters to ensure the quality and yield of the product.