Continuous production method for high-temperature-resistance nylon and device

Abstract

The present invention relates to the field of polymer material synthesis. Provided is a continuous production method for high-temperature-resistance nylon, aiming at the problem of poor hue of nylon prepared by high-temperature polymerization and the problem of poor homogeneity of copolymerized nylon. The method comprises: step 1, mixing a dibasic acid, a diamine, a lactam, a reaction aid and water, and performing a salt forming reaction to obtain a nylon salt solution; step 2, the nylon salt solution undergoing a pre-polymerization reaction in a tubular polymerization reactor, and performing drying after the reaction to obtain a powdery prepolymer; step 3, the powdery prepolymer first undergoing primary polycondensation in a primary polycondensation reactor and then undergoing secondary polycondensation in a secondary polycondensation reactor, so as to obtain powdery high-temperature-resistance nylon, the reaction temperatures of the pre-polymerization and polycondensation being 200-250℃, all of the polycondensation stages being carried out below the melting point of materials, and the temperature of the secondary polycondensation being higher than that of the primary polycondensation. In the present invention, the reaction temperatures of the whole polymerization piping are relatively close and are below 250℃, thus greatly improving the homogeneity of copolymerization components and the hue. Also provided in the present invention is a matching device for the production method.

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