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[Chemical Knowledge]：Production and manufacturing method and process flow of polyhexamethylene adipamide

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Poly (hexamethylene adipamide) (Polyhexamethylene Adipamide, referred to as PA66) is an important chemical raw material, widely used in plastics, fibers and engineering materials and other fields. The following is a detailed description of the method for producing polyhexamethylene adipamide.

1. Raw Materials Preparation

The main raw materials for manufacturing polyhexamethylene adipamide are adipic acid and hexamethylene diamine. These two raw materials are relatively easy to obtain in the market, but the quality and purity need to be paid attention.

2. polymerization reaction

1. ring opening polymerization: adipic acid and hexamethylene diamine according to a certain molar ratio into the reaction kettle, heating to a certain temperature, so that adipic acid and hexamethylene diamine ring opening polymerization reaction, generating poly adipamide.
2. Polycondensation reaction: After the ring-opening polymerization reaction is completed, a catalyst is added and heating is continued to cause polycondensation reaction between molecules of poly (hexamethylene adipamide) to generate high molecular weight poly (hexamethylene adipamide).

3. post-treatment

1. Dehydration: The reaction product is subjected to vacuum dehydration to remove residual moisture and other low molecular weight by-products.
2. Granulation: The dehydrated hexamethylene adipamide is cut into granules to obtain granules of a certain length and diameter.

4. Quality Control

In the manufacturing process, it is necessary to strictly control the temperature, time, amount of catalyst and other parameters of the polymerization reaction to ensure that the quality and molecular weight of the product meet the requirements. At the same time, it is also necessary to test the quality of raw materials to ensure compliance with manufacturing requirements.

In summary, the manufacturing method of polyhexamethylene adipamide requires a number of steps including raw material preparation, polymerization reaction, post-treatment and quality control. In the manufacturing process, attention should be paid to the operation details and parameter control of each step to ensure the quality and yield of the product.

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