Abstract: Urethane adduct was synthesized from decarboxylated cashew nut shell liquid (CNSL),hexamethylenediisocynate(HDI) and polyethylglycol(PEG),which was then reacted with melamineformaldehyde resin to form aqueous coating material.The optimized formulation was obtained and the performance of the coating is: hardness 0.56;impact strength 50 kg·cm;adhesion strength level 2;flexibility 2 mm,resistant to boiling water. This study provides a new way to comprehensive utilization of CNSL.

Key words: cashew nut shell liquid, urethane adduct, melamineformaldehyde resin, aqueous coating material