PA66 engineering plastic is a condensation polymer that uses hexamethylenediamine and adipic acid as monomers and is connected by amide bonds. It has high strength, good resistance, and excellent performance such as wear resistance. It is used in automobiles, electronics and textiles. Has a wide range of applications. With the continuous increase in the market demand for PA66 engineering plastics in my country, more and more companies independently research and produce engineering plastics in China. They will in-depth study the production process of nylon 66, especially its polycondensation method.

In the process of producing PA66 engineering plastics, the more commonly used polycondensation methods include sequential polycondensation and intermittent polycondensation. The successive polycondensation method can be divided into horizontal tube type decompression continuous polycondensation, vertical tube type continuous polycondensation, and “five major device” type continuous polycondensation according to the different equipment capabilities used for polycondensation. The application is more common. The “five major” type sequential polycondensation method means that nylon 66 material is made into PA66 engineering plastics with good performance after passing through the evaporator, preheater, tubular reverberator, flash evaporator and finishing reverber in sequence.

The intermittent polycondensation method and the successive polycondensation method produce PA66 engineering plastics in the same principle, and the reaction conditions are basically the same. Only the reaction process in the intermittent method (such as heating, high-pressure polymerization, decompression, evacuation, etc.) needs to be completed intermittently in the high-pressure reactor. The processes of pre-condensation, flash evaporation, and finishing polycondensation in successive polycondensation are successively carried out in different connected equipment. That is to say, the polycondensation process of PA66 engineering plastic in the batch method changes with the change of the response time, while the reaction process in the continuous method changes with the change of the spatial orientation. These two polycondensation methods have their own advantages and disadvantages. Ask to choose.