Industrial method and polycondensation reactor for continuously preparing poly-p-phenylene terephthamide resin with high viscosity

Abstract

The invention relates to an industrial method and a polycondensation reactor for continuously preparing poly-p-phenylene terephthamide resin with high viscosity, comprising the following steps: (1) compounding a flux into an aqueous solution, then mixing with solvent to remove water by refinement and continuously and stably obtaining a solvent system with the water content conforming to the requirement, wherein the weight percentage of the flux in the solvent system is from 6 percent to 15 percent; (2) performing the polycondensation reaction of para-phenylene diamine (PPD) and terephthalyl chloride (TPC) in the mol ratio of 1.01-1 to 1-1.01 in the solvent system prepared in the step (1), and obtaining a polymer after reaction; and (3) obtaining the poly-p-phenylene terephthamide resin inyellow powder after pulverizing, neutralizing, washing and drying the polymer. By utilizing the method, the adverse effects of weather and operation on the polymerized solvent system water is overcome, and continuous, closed and clean production is realized.

Description

Industrial method and polycondensation reactor for continuous preparation of high-viscosity poly-p-phenylene terephthalamide resin technical field The present invention relates to a kind of industrial method for continuously preparing high-viscosity poly-p-phenylene terephthalamide resin (PPTA), especially relate to the aqueous solution of a kind of co-solvent mixed with water-containing NMP to prepare anhydrous NMP / co-solvent solution, then The industrialized method of polymerizing PPD and TPC in anhydrous solvent to prepare high-viscosity poly-p-phenylene terephthalamide resin. Background technique Polyparaphenylene terephthalamide resin (PPTA) is the raw material for preparing aramid 1414 fiber and pulp. Because of their high strength, high modulus, high temperature resistance, flame retardant and other excellent comprehensive properties, they have been widely used in military, aerospace, sports, communication, chemical and other fields. At present, in the relevant rep...

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Problems solved by technology

In this patent, when preparing NMP-CaCl2 solvent, solid industrial CaCl2 is also added to NMP after burning, so the logarithmic viscosity of the resin is not high (the highest is only 5.5). In addition, due to the use of liquid ammonia to neutralize hydrochloric acid , Liquid ammonia is a flammable, explosive, volatile liquid with pungent odor, which is unfavorable to environmental protection and solvent recovery

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