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[Chemical Knowledge]：Manufacturing method and process of PMMA

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PMMA (polymethyl methacrylate) is a kind of transparent organic glass, which has the advantages of high transparency, high hardness, good weather resistance and easy processing. It is widely used in the field of chemical production raw materials. A manufacturing method of PMMA will be described below.

1. Raw Material Preparation

The main raw material for manufacturing PMMA is methyl methacrylate (MMA). MMA is a colorless and transparent liquid with a strong pungent odor. Before making PMMA, it is necessary to purify MMA to remove impurities.

2. Polymerization

The manufacturing process of PMMA is to convert MMA monomer into high molecular polymer by polymerization reaction. The polymerization can be carried out in solution or in bulk. Among them, the solution polymerization method is a more commonly used method.

1. solution polymerization method

solution polymerization method is the MMA monomer, initiator, solvent and other raw materials into the polymerization kettle, under the action of stirring polymerization reaction. Commonly used initiators are benzoyl peroxide, azobisisobutyronitrile, etc. In the reaction process, it is necessary to control the temperature, stirring speed, initiator dosage and other factors to ensure the smooth progress of the reaction.

2. bulk polymerization method

bulk polymerization method is the MMA monomer and initiator directly into the polymerization kettle polymerization reaction, do not need to add solvent. This method has the advantages of high product purity and low production cost, but it needs to control the reaction temperature and pressure to ensure the stability and safety of the reaction.

3. post-treatment

After the polymerization reaction is completed, PMMA needs to be post-treated to obtain high-quality products. Post-processing includes crushing, granulation, drying, screening and other processes to obtain a certain particle size and dryness of PMMA products.
Precautions for
4.

1. In the manufacturing process, the quality of raw materials needs to be strictly controlled to ensure product stability and reliability.
2. It is necessary to pay attention to the control of temperature and pressure during the polymerization reaction to avoid safety accidents.
3. It is necessary to pay attention to the particle size and dryness of the product during the post-processing process to ensure the quality and performance of the product.

In short, the manufacturing process of PMMA needs to strictly control the process parameters and raw material quality of each process to ensure product quality and stability. At the same time, it is necessary to pay attention to safety production and environmental protection requirements to avoid harm to the environment and human body.

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