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Waterborne Polyurethane Coatings with Covalently Linked Black Dye Sudan Black B

CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China
Author to whom correspondence should be addressed.
Materials 2017, 10(11), 1247;
Received: 17 September 2017 / Revised: 26 October 2017 / Accepted: 26 October 2017 / Published: 28 October 2017
PDF [4944 KB, uploaded 30 October 2017]


Colored waterborne polyurethanes have been widely used in paintings, leathers, textiles, and coatings. Here, a series of black waterborne polyurethanes (WPUs) with different ratios of black dye, Sudan Black B (SDB), were prepared by step-growth polymerization. WPU emulsions as obtained exhibit low particle sizes and remarkable storage stability at the same time. At different dye loadings, essential structural, statistical and thermal properties are characterized. FTIR (fourier transform infrared) spectra indicate that SDB is covalently linked into waterborne polyurethane chains. All of the WPUs with covalently linked SDB show better color fastness and resistance of thermal migration than those with SDB mixed physically. Besides, WPUs incorporated SDB covalently with different polymeric diols, polytetramethylene ether glycol (PTMG), polypropylene glycol (PPG), poly-1, 4-butylene adipate glycol (PBA) and polycaprolactone glycol (PCL), were prepared to obtain different properties to cater to a variety of practical demands. By a spraying method, the black WPUs can be directly used as metal coatings without complex dyeing process by simply mixing coating additive and other waterborne resins, which exhibit excellent coating performance. View Full-Text
Keywords: sudan black B; waterborne polyurethane; polymeric dye; metal coatings sudan black B; waterborne polyurethane; polymeric dye; metal coatings

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Wang, T.; Sun, W.; Zhang, X.; Xu, H.; Xu, F. Waterborne Polyurethane Coatings with Covalently Linked Black Dye Sudan Black B. Materials 2017, 10, 1247.

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