Industrial synthesis method of polyarylether sulfone resin

Abstract

The invention discloses an industrial synthesis method of polyarylether sulfone resin, which comprises the following steps: with 4,4'-dichlorodiphenyl sulfone and 4,4'-biphenol or 4,4'-dihydroxy diphenyl sulfone as reaction monomers, sulfolane as a solvent and sodium carbonate as a salt forming agent, adding the solvent into a reaction kettle filled with nitrogen protection, stirring and heating to 60-80 DEG C, and sequentially adding the reaction monomers, wherein the solid content of the system is 20-45%; after all monomers are dissolved, adding the salt forming agent into the system, then adding a dehydrating agent, stirring and heating to 200-210 DEG C, and performing a salt forming reaction for 1-2 hours; after the salt forming reaction is over, heating to 220-240 DEG C, and performing a constant-temperature polymerization reaction for 1-2.5 hours to obtain polymer mucus; cooling the polymer mucus with water, and grinding into powder; filtering, boiling with deionized water, washing to remove the solvent and the byproduct salt, and drying to obtain the polyarylether sulfone resin. The method disclosed by the invention can greatly shorten the reaction time, increase the productivity, reduce the consumption of raw materials, save the cost and reduce the energy consumption.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to an industrial synthesis method of polyaryl ether sulfone resin. Background technique [0002] Polyaryl ether sulfone is a kind of high-performance engineering plastics, because of their excellent comprehensive properties such as heat resistance, hot water resistance, creep resistance, dimensional stability, impact resistance, chemical resistance, non-toxicity, flame retardancy, etc. Therefore, it has been widely used in the fields of electronics, electrical appliances, machinery, automobiles, medical appliances, food processing and non-stick coatings for a long time. [0003] Industrially important polyarylethersulfones include polyethersulfone (PES) and biphenyl polyethersulfone (PPSU), both of which have high glass transition temperatures (~220°C). Existing polyarylethersulfones have a production process using diphenyl sulfone as a solvent, such as Eu...

AI Technical Summary

Problems solved by technology

The biggest disadvantage of the diphenyl sulfone solvent system is: (1) high reaction temperature, diphenyl sulfone is easy to sublime under high temperature and nitrogen flow state, and at the same time, part of the reaction monomer is brought out to destroy the monomer ratio of the system; (2) in the reaction A certain amount of anti-degradation agent needs to be added when adding end-capping dosage and reacting the reaction monomer in the later stage, making the system more complicated and increasing the difficulty of the post-processing section; (3) The cost of diphenylsulfone is high, and post-processing needs to use Purification of organic solvents such as acetone, the process is relatively complicated

However, the existing process of the sulfolane solvent system in the industrial production process has the following disadvantages: (1) The process using alkali metal hydroxide (KOH or NaOH) as the salt-forming agent is too alkaline, and under conditions of high temperature and water, excessive KOH or NaOH completely with metal ions and - OH exists in the form of sulfolane, and sulfolane is easy to decompose, causing adverse effects such as complex system; (2) using KOH or K 2 CO 3 As a salt-forming agent, it will cause the resin to contain potassium end groups, which will reduce the stability of the resin during high-temperature processing; (3) For product quality considerations, Na 2 CO 3 It needs to be imported from abroad, and the cost is high; (4) xylene is used as the water separating agent, and the amount of xylene added is 10-20% of that of sulfolane. Due to the relatively low boiling point of xylene (138-144°C), it is formed The high temperature in the salt stage (200~210°C) will lead to violent cooling and reflux, which will take away a lot of heat and cause high energy consumption; (5) It takes a long time to heat up to the salt-forming temperature, increasing energy consumption and reducing production capacity

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