Polyether sulfone synthesis method with high batch stability

Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to a polyethersulfone synthesis method with high batch stability. According to the method, the matching degree of microwaves and polyethersulfone synthesis is screened for the first time, and according to the principle that a large amount of friction heat is generated due to molecular vibration and frequent collision among molecules, the temperature of the material is rapidly increased in a short time, so the salt forming reaction time is greatly shortened. According to the invention, a microwave reactor composite liquid nitrogen rapid cooling technology is adopted, and a cooling program is set, so that the temperature is rapidly reduced to the room temperature when the polymerization later-stage reaction is finished, and the reaction is rapidly terminated, thereby rapidly synthesizing the polyether sulfone with extremely narrow molecular weight distribution, controllable molecular weight and high product batch stability. The microwave reaction is controlled by digital programming, the experiment repetition rate is high, the performance of different batches of products is more stable, and the error between the final molecular weight and the target molecular weight can be controlled within 700 when the reaction is finished.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polyethersulfone synthesis method with high batch stability. Background technique [0002] Polyethersulfone (polyethersulfone), also known as polyphenylene ether sulfone or polyaryl ether sulfone, is a thermoplastic polymer material with excellent comprehensive performance developed by the British ICI company in 1972. It is one of the few special engineering materials currently used One of the plastics, known as the first special engineering plastic that combines high heat distortion temperature, high impact strength and excellent formability. The polyethersulfone molecule has the rigidity of the benzene ring and the flexibility of the ether group. At the same time, the conjugation effect between the sulfone group and the entire structural unit provides the oxidation resistance and thermal stability of the material, so the entire molecule has considerable ...

AI Technical Summary

Problems solved by technology

The traditional methods of terminating the reaction include: (1) cooling down by adding a cold solvent to terminate the polymerization reaction, but the cooling speed of the traditional heating method is slow, and it takes about 1 hour to lower the reaction from 190°C to room temperature. During the cooling process, there are still Due to the residual heat, the molecular weight continues to increase when the reaction needs to be terminated, and the molecular weight of the product cannot be precisely controlled. There is a large gap between the termination of the polyethersulfone polymerization reaction and the molecular weight of the final product, generally between 1500-3000

(2) It is also possible to terminate the reaction by adding an end-capping agent at the end of the polyethersulfone polymerization reaction. Although this method can quickly terminate the reaction, the addition of the end-capping agent will inevitably introduce a new impurity, and this impurity is difficult to obtain. Complete removal will affect the physical and chemical properties of polyethersulfone products

[0005] (1) When there are many low-molecular-weight parts, flashing is easy to occur during injection molding, the temperature resistance of precision parts is worse, and the end of the parts will be deformed due to local heating; it is easy to break during the spinning process, and the finished product of the hollow fiber membrane rate reduction

[0006] (2) When there are many high-molecular-weight parts, the coating will be uneven when the powder is coated and melted, and there will be unmelted crystal points; poor solubility will occur during the spinning process, and the spinneret will be easily blocked.

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