乳化剂和共乳化剂对甲维盐水乳剂乳液稳定性的影响

Effects of emulsifier and co-emulsifier on the particle diameter and surface tension of emulsion in water of emamectin benzoate

在筛选出合适的乳化剂和共乳化剂的基础上,研究了乳化剂亲水亲油平衡值(HLB)、含量以及共乳化剂含量对1%甲氨基阿维菌素苯甲酸盐水乳剂乳液体系稳定性的影响,以及乳化剂在54℃热贮2周的稳定性.结果表明,乳化剂的HLB可以为水乳剂的乳液稳定性提供参考依据,乳液的粒径和表面张力随着乳化剂含量的升高而减小,当乳化剂含量增大到一定程度后,粒径和表面张力开始趋于稳定.共乳化剂对水乳剂的粒径没有太大影响,但可以显著降低水乳剂的表面张力,增强体系的稳定性.水乳剂乳液粒径和表面张力在一定范围内可以反映出乳液体系的稳定性,当粒径和表面张力变小时,乳化剂HLB、含量或共乳化剂含量能够满足热贮稳定性,则此时乳化剂或共乳化剂种类及含量为最佳.

Based on the successful screening for the optimal emulsifiers and co-emulsifiers,the effects of hydrophile lipophile balance（HLB） values of emulsifiers and the concentrations of emulsifiers and co-emulsifiers on the stability of 1% emulsion in water（EW） of emamectin benzoate were studied at 54 ℃ for two weeks.In addition,the stability of emulsifiers was studied.The results showed that the stability of the latex was related to the HLB values of the emulsifiers.The particle diameter and surface tension of the EW decreased corresponding to the increase of the concentration of emulsifier,but particle diameter and surface tension of the 1% emamectin benzoate EW tended to be stable whether the concentration of the emulsifiers increased or not at a higher concentration.No significant effect of co-emulsifiers on the particle diameter of the EW was found.However,co-emulsifiers could increase the stability of the 1% emamectin benzoate EW by decreasing surface tension.The results indicated that the stability of the 1% emamectin benzoate EW could be reflected by particle diameter and surface tension of the latex.The concentration and classes of emulsifier and co-emulsifier with the lowest HLB values were thought to be the optimal,if the concentration and classes of emulsifier and co-emulsifier were stable after the 1% emamectin benzoate EW was stored at 54 ℃ for two weeks.