The present invention provides a W/O nanoemulsion which remains stable even if stored for long periods of six months, for example. The W/O nanoemulsion of the present invention comprises: a) a water content of greater than 0 wt% but no greater than 30 wt%; b) an oil content of less than 100 wt% but no less than 70 wt%; c) 1 to 30 parts by weight of at least one nonionic surfactant for every 100 parts by weight of oil, the nonionic surfactant having an HLB value of 1 to 10; and d) 0.1 to 30 parts by weight of at least one selected from the group consisting of an anionic surfactant, a cationic surfactant, and an amphoteric surfactant, for every 100 parts by weight of water, wherein the average particle size of 50% of the water particles in the W/O nanoemulsion is 100 nm or less.
本发明提供一种 W/O 纳米乳液,该乳液即使长期储存(例如六个月)也能保持稳定。本发明的 W/O 纳米乳液包括:a)
水含量大于 0 wt%,但不大于 30 wt%;b) 油含量小于 100 wt%,但不小于 70 wt%;c) 每 100 重量份油含有 1-30 重量份的至少一种非离子表面活性剂,该非离子表面活性剂的 HLB 值为 1-10;d) 0.1 至 30 份(按每 100 份
水的重量计)至少一种选自阴离子表面活性剂、
阳离子表面活性剂和两性表面活性剂的表面活性剂,其中 W/O 纳米乳液中 50%的
水颗粒的平均粒径为 100 纳米或更小。