Characterization of Biological Waterborne Polyurethane for Synthetic Leather
In order to solve the problem of solution dissolution and peeling of one-component waterborne polyurethane coating in synthetic leather,the bio-based waterborne polyurethane resin was synthesized from isophorone diisocyanate(IPDI),biological polycarbonate diols(PCDL),hydrophilic chain extender dimethylol propionic acid(DMPA),small molecule polyol and polyamine.The water-borne polyurethane was characterized by FTIR,DSC and TGA,and the physical and chemical properties of the polyurethane were studied.The experimental results show that the bio-based polyurethane has two soft segment Tg and one hard segment Tg,which are-73.0℃,-26.0℃and 39.0℃respectively,and the thermal decomposition temperature is 417.0℃under the condition of 95%mass loss.The maximum breaking strength is 38.4 MPa,the elongation at break is 663.2%,the static water contact angle is 79.0°,the water absorption of the film in deionized water is 6.8%,and the water resistance and tensile strength of the film are better in the washing liquid immersion test.
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