摘要
为探讨片状带电粒子的聚集作用在Pickering乳状液的制备与稳定中的作用,研究了带有正电荷的片状氢氧化镁铝(MAH)微粒对液体石蜡/水体系的乳化作用,及高价阴离子钠盐柠檬酸钠对MAH的聚集作用和该聚集作用对液体石蜡/水的乳化及乳状液稳定性的影响。结果表明,MAH在初始油与水体积比小于3∶1时,可以将液体石蜡/水乳化为O/W型乳状液,乳状液稳定性随液体石蜡体积分数的增加而提高,粘度和液滴直径也随之增加。加入占MAH质量分数10%的柠檬酸钠,可使MAH聚集形成高粘度松散聚集体,提高了MAH对液体石蜡/水的乳化与稳定作用,但乳状液的粘度也随之提高。当柠檬酸钠的质量分数大于10%时,开始引起MAH的失水凝聚,乳状液的稳定性降低,液滴直径也急剧增大。
To explore the role of aggregation of solid particles in stabilizing Picketing emulsions, the emulsifying effect of positively charged magnesium aluminum hydroxide （MAH） on paraffin/water system, the influence of sodium citrate on the aggregation of MAH as well as on the formation of MAH stabilized paraffin/ water emulsion were investigated. The results show that MAH may stabilize the initial oil-to-water volume ratio was less than 3： 1. The stability of the paraffin-in-water emulsion when paraffin-in-water emulsion was improved with increasing paraffin volume fraction, which was accompanied by the increase of emulsion viscosity and droplet size. At the level of less than 10% （w/w based on MAH）, sodium citrate induced the aggregation of MAH particles forming open aggregates with high viscosity, which improved the stability of MAH stabilized paraffin/water emulsion. However, the viscosity of the increased. When denser MAH aggregates were formed by the charge addition level of sodiu~ citrate was larger than 10%, the stability paraffin-in-water emulsion was also neutralization of citrate, e. g. , the of MAH stabilized paraffin-in-water emulsion was lowered and the emulsion droplet size rapidly increased.
出处
《应用化学》
CAS
CSCD
北大核心
2008年第11期1271-1276,共6页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(20476053)
山东省自然科学基金(Y2005B17)资助项目
关键词
氢氧化镁铝
微粒乳化作用
液体石蜡
柠檬酸钠
magnesium aluminum hydroxide （ MAH）, microparticle emulsifying effect, paraffin, sodium citrate
