Synthesis and Properties of Novel Non-Ionic Polyurethane Dispersion Based on Hydroxylated Tung Oil and Alicyclic Isocyanates

Hydroxylated Tung oil (HTO) based nonionic polyurethane dispersion (HTO-NPUD) were synthe- sized using dicyclohexyl methane diisocyanate (HMDI) and HTO as main hydrophobic materials whereas polyethylene glycol-800 (PEG-800) as hydrophilic chain extender. To effectively study the effects of HTO on properties of NPUD, polypropylene glycol-400(PPG-400) based NPUD was pre- pared by HMDI reacting with PPG-400 and PEG-800. The structures of those novel nonionic po- lyurethane dispersions were characterized by FTIR and 1H NMR. Moreover, particle size and size distribution, cloud point and surface tension had been investigated. Results showed that, by com- paring with PPG based NPUD (PPG-NPUD), the introduction of HTO into NPUD result in larger par- ticle size and more uniformed particle size distribution, higher cloud point and lower surface ten- sion.