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[Chemical Knowledge]：The manufacturing method and process of PM/PMA.

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PM/PMA manufacturing method: exploration
in the field of raw materials for chemical production
abstract

this paper introduces in detail the manufacturing methods of PM (polymethyl methacrylate) and PMA (polymethyl acrylate) in the field of raw materials for chemical production. Through in-depth discussion of the production process, raw material selection, reaction conditions and post-treatment and other aspects of the content, aimed at providing a useful reference for the production of chemical products.

Introduction

PM and PMA as common chemical production raw materials, widely used in plastics, coatings, adhesives and other fields. With the continuous growth of market demand, it is of great significance to study its manufacturing methods for improving production efficiency, reducing costs and optimizing product quality.

1. Raw Material Selection

1. Methyl Methacrylate (MMA): The main raw material for the production of PM, with high transparency, high hardness, good weather resistance and so on.
2. Methyl acrylate (MA): The main raw material for the production of PMA, with low viscosity and easy processing.

2. Production Process

1. Solution Polymerization

MMA or MA monomer and initiator, chain transfer agent, etc. are added to the solvent, and the polymerization reaction is carried out under stirring conditions. By controlling the reaction temperature, time and the amount of initiator, PM or PMA with moderate molecular weight and uniform molecular weight distribution can be obtained.

2. Suspension Polymerization
The polymerization is carried out
adding water, dispersant and MMA or MA monomer to a reactor and introducing an initiator. This method can obtain PM or PMA particles with uniform particle size and high transparency.

3. Emulsion Polymerization

MMA or MA monomer, water, emulsifier and initiator are mixed to form an emulsion followed by polymerization under agitation. This method can prepare PM or PMA emulsion with small particle size and uniform distribution.

3. reaction conditions optimization

1. temperature: appropriate to increase the reaction temperature is conducive to accelerate the rate of polymerization, but too high temperature may lead to polymerization or decomposition. Therefore, it is necessary to select the appropriate reaction temperature according to the specific process.
2. initiator dosage: too much initiator dosage will lead to too fast reaction rate, too little initiator dosage may lead to too slow reaction rate. Therefore, it is necessary to optimize the amount of initiator to improve the production efficiency.
3. pH value: In the process of emulsion polymerization, adjusting the pH value of the system helps to stabilize the emulsion state and improve the stability of the emulsion. Therefore, it is necessary to select the appropriate pH value according to the specific process.

4. Post-Treatment
After completion of the
polymerization, post-treatment is required to obtain the final PM or PMA product. The specific steps include: removal of unreacted monomers, solvents and moisture; granulation or emulsification to obtain the product in the desired form; and finally packaging and storage.

Conclusion

This paper discusses the manufacturing methods of PM and PMA in detail, including raw material selection, production process, optimization of reaction conditions and post-treatment. Through the comparison and analysis of different manufacturing methods, it aims to provide a useful reference for the production of chemical products. In the actual production process, the appropriate manufacturing method can be selected according to specific needs and conditions to improve production efficiency, reduce costs, and optimize product quality.

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