Post-treatment method for polysulfone resin prepared by solution method

Abstract

The invention discloses a post-treatment method for polysulfone resin prepared by a solution method. The post-treatment method comprises the following steps that: (1) inert gas is filled into a reaction kettle to make the pressure inside the reaction kettle higher than the atmosphere pressure, and then is extruded out from nozzle holes in the lower part of the reaction kettle to form resin flow; (2) the resin flow enters coagulating batch through a drawing roller and coagulates while drawing in the coagulating batch under the action of the drawing roller to form threads; (3) the threads enter a granulator through a driving roller to be cut into resin particles; and (4) the resin particles are washed, cleaned and dried to form pure resin particles. According to the post-treatment method, the washing times can be reduced in the washing process, i.e. the post-treatment method can conform to the qualification standard, so that the energy consumption and cost are reduced. Meanwhile, according to the post-treatment method, the loss of the polysulfone resin in the post-treatment process is reduced, and the yield is increased, so that the packing density of the pure resin is greatly improved, and the resin particles obtained by the post-treatment can be directly used for injection, extrusion molding or modification.

Description

technical field [0001] The invention belongs to the field of preparation of special engineering plastics, and in particular relates to a post-treatment method of polysulfone resin prepared by a solution method. Background technique [0002] The traditional industrial post-treatment process for special engineering plastics such as polyethersulfone resins is to crush them into powder or small granular solids with a crusher, and then use a large amount of water or other solvents to cook at high temperature for many times, so that the solvent and The by-product inorganic salt is dissolved in the washing liquid, and then the solid-liquid separation is carried out by means of centrifugation or pressure filtration to achieve the purpose of purifying the resin. It is generally believed that the smaller the particle size of the solid material, the easier it is to remove impurities such as solvents and by-product inorganic salts. But this method also has some problems and deficiencie...

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Problems solved by technology

But this method also has some problems and deficiencies, for example: pulverized smaller particle size solids tend to block and pass through the mesh or sieve, causing separation difficulties and greater losses during solid-liquid separation, reducing the Recovery rate; although the resin is a fine particle or powder, its microstructure is still dense, and it still needs to consume a large amount of washing solvent during washing and can be purified after repeated washing. The production cost is high and the efficiency is low; the powder resin is directly extruded into pellets Feeding is difficult during extrusion modification; the powder after drying has a very small density, which is easy to raise dust and pollute the environment; once dust or other dirt is mixed in, it is difficult to clean up; the bulk density is small, and it takes up a lot of space during storage and transportation, so it has to be cleaned again. Post-processing such as compaction

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