Method for refining crude product of polyether ketone ketone by using hydrochloric acid solution of oxalic acid

Abstract

The invention relates to a high polymer material refining method, and in particular relates to a method for refining a crude product of polyether ketone ketone by using a hydrochloric acid solution of oxalic acid. The method comprises the following steps: firstly, refluxing and stirring a certain amount of the crude product of polyether ketone ketone in a dimethyl sulfoxide solution; subsequently adding the hydrochloric acid solution of oxalic acid, refluxing and stirring, cooling, and filtering; and refluxing and washing with water, filtering, and drying, thereby obtaining a pure product of polyether ketone ketone. By virtue of the swelling property of polyether ketone ketone in the dimethyl sulfoxide solution, molecular chains of polyether ketone ketone by which catalyst impurities are tightly wrapped can be expanded, then impurity ions can be diffused into organic phase, and meanwhile, metal ions can be continuously captured by virtue of the metal-chelating property of oxalic acid, so that Al<3+> in the crude product of polyether ketone ketone can be effectively removed.

Description

technical field [0001] The invention relates to a method for refining polymer materials, in particular to a method for refining crude polyether ketone ketone by using an aqueous hydrochloric acid solution of oxalic acid. Background technique [0002] Polyether ketone ketone (PEKK) is a high-performance semi-crystalline thermoplastic polymer, which belongs to the family of polyarylether ketone special polymer materials. Radiation and flame retardancy have broad application prospects in the fields of national defense, aerospace, electronic information, automobile manufacturing, petrochemical, medical and health, and household appliances. [0003] The electrophilic substitution reaction route to synthesize PEKK usually uses the Friedel-Crafts reaction catalyst AlCl 3 Synthesis, the reaction process requires a large amount of catalysts, due to the entanglement of macromolecular chains, some catalysts are firmly wrapped in the polymer, and catalysts inevitably remain in the poly...

AI Technical Summary

Problems solved by technology

[0004] Traditional methods generally use solvents such as hydrochloric acid, chlorinated alkanes, and alcohols to remove residual metal ion impurities through repeated washing. The process is cumbersome, the treatment efficiency is low, the toxicity is high, the safety risk is high, and the environment is seriously polluted, which is not conducive to product quality stability and scale. production, and the high production cost seriously affects the large-scale application and promotion of polyether ketone ketone

CN200410081436 uses organic solvents and surfactants for purification, which increases the amount of organic solvents and increases production costs; US20050004340 uses high-temperature and high-pressure purification methods, which improves the use requirements of equipment; CN200910009128 uses acid purification methods, a large number of Acid solution brings difficulties to the biochemical treatment of post-production wastewater