Polyurethane material and preparation, recovery and regeneration methods thereof

Abstract

The invention provides a polyurethane material and preparation, recovery and regeneration methods thereof, and belongs to the technical field of polyurethane. A hydroxyl-containing ketene amine compound, dihydric alcohol, diisocyanate and a cross-linking agent are mixed and dissolved in an organic solvent according to a certain proportion, then the solvent is removed at a high temperature, and reaction molding is performed. According to the invention, small molecules containing a ketene structure are prepared, the small molecules and isocyanate are used to construct dynamic reaction bonds, and the dynamic reaction bonds are added into a polyurethane system, so that polyurethane has dynamic recoverability. Compared with a linear or cross-linked structure, the polyurethane has the advantages of the two structures, and the thermoplasticity is maintained while the solvent resistance and the mechanical property are improved. The method has the advantages of easily available raw materials and low cost. The mechanical properties and the like of the obtained polyurethane elastomer material are improved, the thermoplasticity is not lost, and the polyurethane elastomer material can be processed and used again. The polyurethane material can be widely applied to daily life and industrial production.

Description

technical field [0001] The invention relates to the technical field of polyurethane, in particular to a polyurethane material and methods for its preparation, recovery and regeneration. Background technique [0002] The performance of polyurethane elastomer is between plastic and rubber, oil resistance, wear resistance, low temperature resistance, aging resistance, high hardness and good elasticity. As an essential class of important polymers in various applications, it has also been widely explored. At present, it has been widely used in many fields in daily life, such as home furnishing, construction, daily necessities, transportation, home appliances and other fields. Despite the many advantages of PU, traditionally designed PU and its materials have disadvantages in terms of self-healing, reworkability, and recyclability due to their irreversible chemical bonds. A large amount of use and consumption is also not conducive to environmental protection. Therefore, research ...

AI Technical Summary

Problems solved by technology

However, the polyurethane elastomer prepared by this method is difficult to recycle and reuse, which is not conducive to sustainable development

[0004] CN101134843A discloses a kind of preparation method of high elastic polyurethane elastomer, adopts PTMG2000 or PPG3000 and BDO, catalyst, antiaging agent to mix as polymer component, the isocyanate in the prepolymer component selects MDI, carbodiimide modification MDI and their mixtures, the high elastic elastomer produced has a narrow hardness range (Shao A80±2), and poor rebound performance

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