不同反离子对高效氯氰菊酯微乳液影响的研究

Study on the Effect of Different Antiparticles on α-Cypermethrin Based Microemulsion

研究了结合不同反离子的十二烷基苯磺酸盐(DBS)与苯乙烯苯酚聚氧乙烯醚(NR600)形成的高效氯氰菊酯微乳液的导电机理,以及反离子对体系相行为的影响.研究结果表明,由于阴离子表面活性剂的溶解度不同以及溶解后反离子结合度的差异,使得反离子能改变微乳液界面的亲水亲油作用.具有较小水化半径的K+使界面的亲水作用增强,更有利于O/W型微乳液的形成,而水化半径较大的Na+,Li+不如K+有利于O/W型微乳液的形成;Ca2+与表面活性剂的阴离子结合形成的油溶性的表面活性剂,有利于微乳液界面亲油作用的增强,不利于O/W型微乳液的形成.这与热贮分解率的结果相一致.

The electric mechanism of a-cypermethrin based microemulsion formed by polyoxyethylene styrenyl phenyl ether and dodecyl benzenesulfonic salt combined with different kinds of antiparticles, and the phase behavior were investigated. The results showed that the different solubility of anionic surfactants and the different binding degrees of the antiparticles had actions on the interfacial property of the microemulsion. K^＋ was propitious to the formation of O/W microemulsion for the small hydrated radius, on the contrary, Na^＋ and Li^＋ were not propitious to such formation for the biggish hydrated radius. Ca^2＋ combined with the anion of the anionic surfactant, to yield lipophilic surfactant, which was not propitious to the formation of O/W microemulsion. It was accorded with the result of decomposition rates.