高摩尔比封闭异氰酸酯水性胶束的制备及其稳定性研究

Aqueous polyurethane micelles blocked by methyl ethyl ketoxime (MEKO) were prepared under the high molar ratio of -NCO to -OH (R>3.0), using 2,6-hexamethylene diisocyanate (HDI), polyethylene glycol (PEG) and dimethylol propionic acid (DMPA). In this paper, the morphology, structure, particle size and distribution，and de-blocking reaction of the blocking polyurethane micelles with high molar ratio were characterized, and the effect of R value, DMPA content, neutralization degree and zeta potential on the particle size and stability in water was further explored. It has been shown that the reaction conditions has significant influence on the stability of the blocking polyurethane micelles, and the stability in aqueous solution could be determined by the initial Zeta potential. As the neutralization degree was at 100% and DMPA contnets were more than 3.3%, the blocking polyurethane micelles prepared at high molar ratio could be dispersed steadily in aqueous solution.