Industrial synthetic method of low-color high-transmittance polysulfone resin

Abstract

The invention discloses an industrial synthetic method of low-color high-transmittance polysulfone resin. The method comprises the following steps: by taking 4,4-dichloro-diphenyl sulfone and bisphenol A as reaction monomers, a low-boiling-point organic substance as a solvent, sodium carbonate as a salt forming agent and 3,4'-dichloro-benzophenone as an end capping agent, raising the pressure in a kettle to 2.0-3.0MPa under the protection of an inert gas, and performing polymerization reaction at 200-210 DEG C to obtain a polymerized mucus; and cooling the polymerized mucus, then crushing the polymerized mucus, filtering, then washing to remove the solvent and byproduct salts, and drying. By adopting the synthetic process disclosed by the invention, the problem that the low-boiling-point solvent cannot meet requirements for polymerization during polymerization under a normal pressure condition is solved, the polymerization time is shortened, water-carrying agents including benzene, methylbenzene and dimethylbenzene and the like, which are required to be added during polymerization at normal pressure are avoided, the production cost is reduced, the process steps of recovering and separating these substances in an after treatment process are avoided, and the polysulfone resin prepared by the process disclosed by the invention has very low color and high transmittance, so that the application area of the product is enlarged.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to an industrial synthesis method of polysulfone resin with low luster and high light transmittance. Background technique [0002] Polysulfone is a thermoplastic engineering plastic with excellent mechanical properties, high rigidity, wear resistance, high strength, high thermal stability, high glass transition temperature (~190°C), and maintains excellent mechanical properties even at high temperatures. Performance, long-term use temperature is 160 ° C, short-term use temperature is 190 ° C, and hydrolysis resistance, good dimensional stability, small molding shrinkage, non-toxic, radiation resistance, flame resistance, self-extinguishing, excellent performance in a wide temperature range It has good electrical properties and chemical stability, and can withstand general acids, alkalis, and salts. Therefore, it has been widely used in the fields of electronic...

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Problems solved by technology

[0003] The existing polysulfone production process is usually prepared by reaction in an open system under normal pressure. Polymerization under normal temperature requires the addition of benzene and other water-dividing agents, which undoubtedly increases the difficulty of the post-treatment process. In the process, benzene is not removed cleanly, which affects the light transmittance of the material and other performance problems; at the same time, the post-processing and recycling process also requires huge equipment and complicated processes, resulting in high production costs and prolonged production cycles.

Chinese patent CN103254421A discloses a high-

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