A self-healing and reprocessable terpene-based polysiloxane aqueous polyurethane, its preparation method and its reprocessing application

Abstract

The invention discloses a self-repairing and reprocessable terpene-based polysiloxane aqueous polyurethane, its preparation method and its reprocessing application, and a self-repairing and reprocessable terpene-based polysiloxane The structural formula of waterborne polyurethane is: wherein, the value range of n is 30‑100. The terpene-based polysiloxane water-based polyurethane with self-repairing performance and reprocessability utilizes the thiourethane bond generated by the click reaction of mercapto-isocyanate to realize the self-repair of the wound, and the self-repair takes a short time and is self-repairing. The repair rate is high; at the same time, the shredded pieces after recycling can be used to obtain a complete water-based polyurethane film through hot pressing technology, which realizes the recycling and reprocessing of water-based polyurethane and reduces the waste of resources.

Description

technical field [0001] The invention relates to a reprocessable terpene-based polysiloxane water-based polyurethane with self-healing performance, a preparation method and reprocessing use thereof, and belongs to the field of modification of two-component water-based polyurethane. Background technique [0002] As an environment-friendly polymer material, water-based polyurethane (WPU) has excellent low temperature resistance, good flexibility and excellent fatigue resistance compared with traditional solvent-based polyurethane. At the same time, the content of volatile organic compounds (VOC) generated during the preparation of water-based polyurethane is extremely low, or even no VOC volatilization. However, during the use of traditional polyurethane materials, due to mechanical damage caused by friction, bending or collision, it is very prone to micro cracks, which affects subsequent operations and use, and is difficult to recycle, resulting in a waste of resources. There...

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Problems solved by technology

[0003] Chinese patent document CN112724358A discloses a preparation method of water-based flame-retardant self-healing polyurethane based on modified graphene, using graphene oxide dispersion, hexaaminocyclotriphosphazene, and 4-dimethylaminopyridine to prepare nitrogen in a nitrogen atmosphere. Phosphorus-modified graphene oxide, then dispersed in butanone, added isocyanate propyltrimethoxysilane to react, and prepared nitrogen-phosphorus-modified nano-graphene oxide after ultrasonic treatment, and then mixed with polytetrahydrofuran ether glycol, dihydroxymethylpropane acid, dibutyltin dilaurate, and isophorone diisocyanate, capped with 2,2'-diselenidethanol, neutralized with triethylamine, emulsified with deionized water, and vacuum removed butanone to obtain diselenium The phosphorus-modified nano-graphene oxide modified by diol-terminated water-based self-healing polyurethane is mixed with the polyurethane prepolymer without adding nitrogen-phosphorus-modified nano-graphene oxide to prepare water-based flame-retardant self-healing polyurethane modified graphene, although It has good self-healing properties, but the preparation process is more complicated, the cost is higher, and the mechanical properties are not significantly improved

Chinese patent document CN112694587A discloses a self-healing polyurethane based on a two-way repairing structure and its preparation method and application, using isophorone diisocyanate, N,N-dimethylformamide and polyethylene glycol to synthesize a polyurethane prepolymer , and then add self-made mixture A to prepare linear polyurethane, and finally add N,N'-(4,4'-methylenediphenyl)bismaleimide to prepare self-healing polyurethane DNEPU, although it can be obtained from Repair performance, but there is a defect of high energy consumption, and the self-repair rate needs to be further improved, which is not conducive to reprocessing

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