A method for synthesizing high-strength polyaryl ether sulfone resin by adding chain extender in the middle section

Abstract

The invention discloses a method for synthesizing high-strength polyaryl ether sulfone resin by adding a chain extender in the middle section, comprising the steps of: using 4,4'-dichlorodiphenyl sulfone and 4,4'-biphenol or 4, 4′‑dihydroxydiphenyl sulfone is the reactive monomer. In the nitrogen-protected reaction kettle, after adding the solvent, start to stir and raise the temperature to 60°C-80°C. Add the reactive monomers in sequence. After dissolving, add the salt forming agent Then add the water separating agent, continue to stir and raise the temperature to 200°C-210°C, and react for 1-2 hours after salt formation; then raise the temperature to 220°C-240°C, perform constant temperature polymerization for 1-2 hours, then add the chain extender and continue the reaction After 40 minutes, the obtained high-strength polyaryl ether sulfone resin viscous is cooled, pulverized, filtered, and dried in a vacuum. The synthesis process of the invention is simple, the production efficiency is high, and the synthesized novel reinforced polyaryl ether sulfone resin has higher mechanical strength, lower melt viscosity, easier processing and molding, and higher thermal stability.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a method for industrially synthesizing high-strength polyaryl ether sulfone resin by adding a chain extender in the middle section. Background technique [0002] Polyarylethersulfone is a high-performance engineering plastic, including polyethersulfone (PES) and biphenyl polyethersulfone (PPSU), both of which have a high glass transition temperature (~220°C), due to their heat resistance , hot water resistance, creep resistance, dimensional stability, impact resistance, chemical resistance, non-toxic, flame retardant and other excellent comprehensive properties, so for a long time in electronics, electrical appliances, machinery, automobiles, medical appliances, food It is widely used in the fields of processing and non-stick coatings. [0003] Industrially important polyarylethersulfones have a production process using diphenyl sulfone and sulfolane as sol...

AI Technical Summary

Problems solved by technology

These two processes have the following defects: (1) the production capacity of polyaryl ether sulfone is low under the same equipment conditions; (2) due to the instability of sulfolane at high temperature, the recovery rate loss of sulfolane in the whole process flow is relatively large; (3) In the late stage of system polymerization, the polymerization rate is weakened, and the molecular weight is difficult to increase; (4) The molecular weight distribution of polyarylethersulfone produced is uneven, the melt viscosity is difficult to control, and the product performance is unstable, which limits its application

[0004] The reaction speed of the polymerization system is greatly affected by the system concentration. We found that in the sulfolane system, the reaction speed decreases with the increase of the concentration. When the solid content is 30-35%, the reaction speed drops by nearly half. There are also certain defects in the solid content

Chinese patent document CN1268526A discloses a method of adding a viscosity regulator organosilicon compound to the system to increase the solid content to 40-45%, but additional organosilicon needs to be added to increase the difficulty of post-processing, and the polymerization cycle is also longer

At present, the most commonly used method is additive blending modification, but polysulfone itself is sensitive to additives, which will reduce the service life of the plastic itself while improving performance.

Chinese patent document CN102532899A discloses a physical method of adding titanium dioxide and glass fiber to polyethersulfone and using mechanical blending to improve its comprehensive mechanical properties such as bonding performance and compatibility, but both titanium dioxide and glass fiber will affect the resin. The light transmittance has a certain influence and the impact strength of the resin is significantly reduced

Chinese patent document CN102532899A discloses organosiloxane polyethersulfone resins containing linear and cage-type main chains and a preparation method thereof. By introducing functional molecular structures into the main chain of polyethersulfone, the polyethersulfone hydrophobicity and mediation properties are improved. electrical constant, but the light transmittance of polyethersulfone synthesized by this method is not high, which is mainly limited to the fields of coatings and microelectronic devices

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