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[Chemical Knowledge]：Production and manufacturing method and process of polycaprolactam

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Polycaprolactam (Polycaprolactam, referred to as PA6) is an important engineering plastic, widely used in automotive, electronics, aerospace, textile and other fields. Its manufacturing method mainly involves chemical processes such as polymerization reaction and polycondensation reaction. This article will introduce the manufacturing method of polycaprolactam in detail.

1. Raw Material Preparation

1. Caprolactam Monomer: Caprolactam is a monomer of polycaprolactam, usually made by the polycondensation reaction of adipic acid and hexamethylene diamine.
2. initiator: commonly used initiators are persulfate, benzoyl peroxide, etc.
3. Additives: such as heat stabilizers, antioxidants, etc., to improve the thermal stability and oxidation resistance of polycaprolactam.

2. Polymerization Process

1. Caprolactam monomer is added to a polymerization kettle and heated to a certain temperature.
2. Add initiator to initiate polymerization.
3. Maintain a certain reaction time at a certain temperature and pressure to fully polymerize the monomer.
4. Unreacted monomers and low molecular by-products are removed by vacuum dehydration or the like.

Post -3. Treatment

1. The polymerization product was subjected to extrusion granulation to obtain polycaprolactam granules.
2. Dry the granules to remove moisture and other volatile substances.
3. Sieve the granules to obtain polycaprolactam products with different particle sizes.
Precautions for
4.

1. The temperature and pressure need to be strictly controlled during the polymerization process to ensure the smooth progress of the reaction.
2. According to the product use and requirements, select the appropriate initiator and additives.
3. Pay attention to the quality and appearance of the product during the post-processing process to ensure the performance and use value of the product.

In short, the manufacturing method of polycaprolactam involves multiple chemical processes, and it is necessary to strictly control the process parameters and operating conditions of each link to ensure the quality and output of the product. At the same time, it is necessary to continuously study and improve the manufacturing process, improve production efficiency and reduce costs to meet the growing demand of the market.

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