Preparation method of polyethersulfone resin

Abstract

The invention relates to a preparation method of polyethersulfone resin. The method comprises the steps of polymer synthesis, precipitation and purification, bisphenol S and 4,4-dichlorodiphenylsulfone are adopted as raw materials, sulfolane is adopted as a solvent, trimethylbenzene is adopted as a desiccant, K2CO3 is adopted as a catalyst, and the whole reaction process is carried out under the protection of an inert gas. The polyethersulfone resin naturally precipitates in a precipitation solution to make a material become a powdery slurry, so the material conveying and next step purification treatment are facilitated, thereby the problems of difficult product purification and difficult solvent recovery are solved, high molecular chains of the polyethersulfone resin are not destroyed, and the purity and the performances of the above product are guaranteed. The polyethersulfone resin prepared by adopting the preparation method has high purity and stable performances, can be applied in fields of foods, electrons, machines, medical treatment and chemical engineering, and solves the problem of low quality of the product due to high content and difficult removal of impurities in products prepared through traditional methods.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, in particular to a synthesis method of polyethersulfone resin. Background technique [0002] Polyethersulfone (PES) is an amber transparent non-crystalline resin with excellent comprehensive properties such as heat resistance, flame retardancy, chemical stability, and dimensional stability, and has good stress crack resistance. Its temperature at 180 ° C Creep resistance is the highest among thermoplastic resins. The structural formula of polyethersulfone resin is: [0003] [0004] There are rigid benzene rings and flexible ether groups in the molecular chain, and the sulfone group forms a large conjugated system with the entire structural unit. Due to these characteristics, polyethersulfone has high strength, high temperature resistance, radiation resistance, acid resistance, and Oxidation and other advantages, and has excellent characteristics of biocompatibility. Polyethersulf...

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Problems solved by technology

Such a production process has the following disadvantages: one is that it is difficult to operate automatically, the site is polluted, and the product in the polymerization tank is likely to remain and affect the next batch production; the other is that the particle size of the powder obtained after crushing is difficult to be uniform, and the catalyst and by-products used for synthesis are still Partially wrapped in the polymer, it is difficult to purify, resulting in low product purity, which limits the application range of the resin; third, mechanical crushing will inevitably destroy the integrity of the molecular chain, resulting in a decrease in product performance; The increase in the viscosity of the material system caused by the temperature drop in the reactor is not conducive to discharging, and will maintain a higher temperature in the reactor, which will cause the undischarged materials to continue to react, and the polymerization reactor in actual production often leads to a longer discharge time , which easily leads to a wide molecular weight distribution of the product; fifth, because polyethersulfone is an amorphous polymer, it has good solubility in solvents, and it takes a lot of time for the product to precipitate and solidify in the cooling liquid, reducing production efficiency

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