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利用自制的SPG(Sh irasu-porous-g lass)膜乳化实验装置研究了制备具有微米级粒径的单分散乳化液体系新方法。对于给定微孔膜孔径条件下,连续相流速和乳化压强成为膜分散过程主要控制因素,对所制备乳液粒径单分散性质起决定作用。对于给定的乳化压强,连续相流速增大,制得的乳液液滴尺寸减小,乳液单分散性增强;保持较高的连续相流速,在临界乳化压强以下,逐渐增大乳化压强使得乳液液滴尺寸增大,乳液单分散性几乎不受影响,超过临界乳化压强后,乳液液滴尺寸急剧增大,乳液单分散性变差。根据上述规律确定合适的工艺条件,使用孔径为0.9μm的SPG膜进行煤油/水体系的膜乳化实验,合成平均粒径3.24μm,分散度为0.56的O/W型稳定乳液。
A new method of preparing a monodisperse emulsion with micron size particles was investigated by using a self-made SPG (Shrasu-porous-gass) membrane emulsification device. For a given microporous membrane pore size, the continuous phase flow rate and emulsification pressure become the main controlling factors of the membrane dispersion process, which will play a decisive role in the monodisperse properties of the prepared emulsion particle size. For a given emulsification pressure, the flow rate of the continuous phase increases, the size of the resulting emulsion droplet decreases, and the emulsion monodispersity increases; maintaining a high flow rate of the continuous phase, gradually increasing the emulsification pressure below the critical emulsification pressure, Droplet size increases, the emulsion monodispersity is almost unaffected, beyond the critical emulsification pressure, the size of the emulsion droplets increased dramatically, the emulsion monodispersity deteriorated. According to the above rules, the appropriate process conditions were determined. The membrane emulsification experiment of kerosene / water system with SPG membrane with a pore diameter of 0.9μm was used to synthesize O / W stable emulsion with average particle size of 3.24μm and dispersion degree of 0.56.