Waterborne polyurethane-polyurea copolymer, waterborne polyurethane-polyurea foam, preparation method thereof and buffer carrier

Abstract

A waterborne polyurethane-polyurea copolymer is obtained by reacting an isocyanate-containing prepolymer with a polyol, dimethylolpropionic acid, 1,4-butanediol, and a surfactant to obtain a first copolymer. The first copolymer is then hydrolyzed using a neutralizing agent containing divalent metal ions to form a second copolymer with polyurea segments. The second copolymer with polyurea segments is then crosslinked with carbodiimide to form the final product. This invention also provides a waterborne polyurethane-polyurea foam, its preparation method, and a buffer carrier. The waterborne polyurethane-polyurea foam is formed by sequentially subjecting the waterborne polyurethane-polyurea copolymer to foaming, coating, drying, rolling, and curing processes, and exhibits excellent mechanical properties, biocompatibility, and water resistance.

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