Polyhexamethylene Adipamide (PA66 for short) is an important raw material for the production of chemicals, which is widely used in the fields of plastics, fibers and engineering materials. The following is a detailed introduction about the manufacturing method of Polyhexamethylene Adipamide.
I. Raw material preparation
The main raw materials for the manufacture of polyhexanediylhexanediamine are adipic acid and adipic diamine. These two raw materials in the market is relatively easy to obtain, but need to pay attention to the quality and purity.
2. Polymerization reaction
1. Ring-opening polymerization: Adipic acid and adipic acid are added into the reactor according to a certain molar ratio, and heated to a certain temperature, so that adipic acid and adipic acid undergo a ring-opening polymerization reaction to produce polyhexanediylhexanediamine.
2. Polycondensation reaction: After the completion of ring-opening polymerization reaction, add catalyst, continue heating, so that polyhexanediylhexanediamine intermolecular polycondensation reaction occurs, resulting in high molecular weight polyhexanediylhexanediamine.
III. Post-treatment
1. Dehydration: Vacuum dehydration of the reaction product to remove residual water and other low molecular weight by-products.
2. Granulation: The dehydrated polyhexanediylhexanediamine is granulated to obtain granules of 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, the quality of raw materials also needs to be tested to ensure that it meets the manufacturing requirements.
In conclusion, the manufacturing method of polyhexanediylhexanediamine requires multiple steps, including raw material preparation, polymerization reaction, post-treatment and quality control. Attention needs to be paid to the operational details and parameter control of each step in the manufacturing process to ensure the quality and yield of the product.
