Abstract: A surfactant containing both hydrophilic and hydrophobic chain segments with terminal hydroxyl group at one end of the molecular chain was prepared by reacting refined commercial cashew nut liquid with polyethylglycol at molar ratio of 1:1. Part of the —NCO group of isocyanurate in the trimerized hexamethylene diisocyanate was capped by such surfactant to obtain water-dispersible isocyanate(WPI),which could be used as a crosslinking agent for the hydrophilic polyurethane(PU) terminated with hydroxyl group. The pot life of the mixture of PU and WPI was 5 h. The crosslineked film, formed from this mixture by addition of nanometer calsium carbonate showed good resistance against acetone and very high rapture elongation.

Key words: cashew nut liquid, water-dispersible polyisocyanate, water-borne coatings, non-ionic surfactant