Researchers from China synthesized a series of novel water-dispersible polyisocyanates (WDPs) by using hexamethylene diisocyanate isoxyanurates (HDI trimer), dimethylol butanoic acid (DMBA), polyethylene glycol monomethyl ether (MPEG-600) and 1,4-cyclohexanedimethanol (CHDM). The effects of molar ratios of DMBA/MPEG and CHDM/MPEG and their amounts on properties of WDPs including the water dispersibility, storage stability, films hardness, and water resistance were investigated.

The results showed that the introduction of CHDM could efficiently improve the storage stability, the hardness and water resistance of 2K-WPU films due to the rigid cyclic structure and hydrophobicity property of CHDM. It was found that WDPs had excellent storage stability, and the 2K-WPU displayed short tack-free times, high hardness, good water resistance, excellent surface appearance and gloss with 3:7:3 of the molar ratio of DMBA/MPEG/CHDM.

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2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44735.