Preparation and properties of colored waterborne polyurethane modified by dihydroxyl dye
In order to investigate the effects of dihydroxyl dye introduction methods on waterborne polyurethane(WPU)emulsion and its film forming properties,a waterborne polyurethane emulsion was synthesized from isophorone diisocyanate,polytetrahydrofuran(PTMG),2,2-dimethylolpropionic acid,and 1,4-butanediol(BDO).Colored chemical copolymerized polyurethane(ARWPUA-1～3)emulsions were then prepared using Acid Red 87 instead of BDO as chain extender.Colored chemical copolymerized polyurethane(ARWPUB-1～3)emulsions were prepared with Acid Red 87 as partial substitute for PTMG.WPU/AR was prepared by blending Acid Red 87 with WPU.The samples obtained were characterized by FTIR,1HNMR and UV-Vis absorption spectroscopy,and further evaluated for analyses on their storage stability,solvent resistance,color fastness to dry/wet friction,and mechanical properties.Molecular dynamics simulation was employed to analyze the binding energy of polyurethane systems.The results indicated that ARWPUA-2 prepared with n(Acid Red 87)∶n(BDO)=1∶4 exhibited excellent storage stability and had no dissolving and decolorization in different solvents with good color fastness to dry/wet friction and high mechanical properties.The tensile strength was 22.6 MPa and the elongation at break was 810%.
waterborne polyurethaneAcid Red 87polymer dyecolor fastnessmolecular dynamics simulationfunctional materials
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