Research on Synthesis and Application of Environmentally Friendly Polyurethane Resin with High Water Resistance
To solve the problem of poor water resistance of waterborne polyurethane,an environmentally friendly polyurethane with high water resistance has been developed.The effects of epoxy resin,isocyanate,small molecule chain extender,hydrophilic monomer and waterborne isocyanate curing agent types on the properties of waterborne polyurethane were studied.The results showed that the waterborne polyurethane coating film prepared by selecting epoxy resin(E51)as the modifier,dicyclohexylmethane diisocyanate(HMDI)as the isocyanate,1,6-hexanediol(HDO)as the chain extender,dimethylolbutanoic acid(DMBA)as the hydrophilic monomer and waterborne isocyanate curing agent(XP2655)as the curing agent had the best performance.Through various performance tests,it was found that the synthesized waterborne polyurethane had low VOC content,excellent water resistance and other physical and mechanical properties.
epoxy resindimethylolbutanoic acidhigh water resistancelow VOC content
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