Preparation method of degradation-controllable polypropylene carbonate

Abstract

A preparation method of degradation-controllable polypropylene carbonate belongs to the technical field of high polymer materials and comprises the following steps: weighing 100g of polypropylene carbonate, putting the polypropylene carbonate into a reactor, adding 600-900ml of a solvent into the reactor, stirring and dissolving at 25-30 DEG C, adding 0.1-5g of an organic auxiliary agent which is an organic alkali or quaternary ammonium salt, continuously stirring for 1-5 hours, and then adding 0.1-5g of a catalyst into the reactor, and decompressing to remove the solvent, and drying in vacuum. According to the preparation method, the metal-free organic additive is introduced into the polypropylene carbonate, so that the accurate control of the thermal degradation temperature of the polypropylene carbonate is realized, the degradation temperature interval can be effectively reduced, the lowest degradation temperature can reach 170 DEG C, and the complete degradation temperature interval can be controlled to be reduced to 51 DEG C. As the non-metal organic auxiliary agent is used, the ash residue after the material is degraded is not increased in the preparation process, so that the material has a very good application space in the field of electronic products.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a method for preparing polypropylene carbonate with controllable degradation. Background technique [0002] Polypropylene carbonate is an aliphatic polycarbonate material, which is generally prepared by the copolymerization reaction of carbon dioxide and propylene oxide under the action of a catalyst. Because of the existence of carbonate bonds in the molecular chain, it has good degradation performance, and is an ideal biodegradable polymer material. It has good application potential in the fields of disposable packaging and plastic film, and helps to solve the current increasingly serious plastic pollution problem. [0003] In addition to the application in the field of biodegradation, polypropylene carbonate also has the characteristics of low thermal decomposition temperature, low heat of combustion and no residue in thermal decomposition, and can be us...

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Problems solved by technology

However, in some special application fields, in order to reduce the destructive effect of temperature on the processed substrate, the material is required to have a lower complete degradation temperature, and the degradation temperature can be reduced only by changing the molecular weight of polypropylene carbonate; in addition It is also possible to accelerate its degradation by adding some inorganic metal salts, but this method increases the metal residue after degradation and affects its application in the field of electronic products