双梳型共聚物对吡虫啉悬浮剂分散稳定性的影响与表征  

Influence of double comb-shaped copolymer on dispersion stability of imidacloprid suspension

作　　者：郝汉[1] 冯建国[2] 马超[1] 陈保莹[1] 吴学民[1] 

机构地区：[1]中国农业大学应用化学系,农业部农药化学与应用技术重点开放实验室,北京100193 [2]扬州大学园艺与植物保护学院,江苏扬州225009

出　　处：《化工学报》2014年第3期1126-1134,共9页CIESC Journal

基　　金：国家'十二五'科技支撑计划项目(2011BAE06A06-10);北京市大学生科学研究与创业行动计划项目(2012bj094)~~

摘　　要：通过FTIR、SEM、XPS、zeta电位和粒度测试研究了双梳型共聚物AgrilanTM 752对吡虫啉悬浮剂分散稳定性的影响。结果表明AgrilanTM 752分子中存在羧基、酯基和聚氧乙烯醚侧链,通过氢键、范德华力和疏水作用力结合吡虫啉,从而有效地分散吡虫啉颗粒;AgrilanTM 752用量与悬浮剂的分散稳定性密切相关,实验条件下得出其最佳用量为3%(质量分数),此用量下AgrilanTM 752的吸附层厚度和zeta电位负值最大;初始pH值超过6后AgrilanTM 752的吸附层厚度逐渐降低,zeta电位在初始pH=10处存在最大负值,初始pH值在2～10范围内悬浮hina剂的分散稳定性普遍较高,pH值超过10后分散稳定性明显降低;电解质离子(Na+、Mg2+和Ca2+)浓度越高则AgrilanTM 752的吸附层厚度和zeta电位负值越低,悬浮剂的分散稳定性越差,相同浓度下电解质离子对悬浮剂的分散稳定性影响程度顺序为Ca2+>Mg2+>Na+。In this paper, the influence of a double comb-shaped copolymer （AgrilanTM 752） on dispersion stability of imidacloprid suspension was studied with FT1R, SEM, XPS, zeta potential and particle size tests. AgrilanTM 752, which contained carboxyl groups, ester groups and poly-oxyethylene chain, combined with imidacloprid by hydrogen bond, van der Waals force and hydrophobic interaction, and dispersed imidacloprid particles in suspensions effectively. The experimental data indicated that thickness of AgrilanTM 752 adsorbed layers, zeta potential and dispersion stability of suspension reached maximum values when its content was 3%（mass）, i.e., the optimum AgrilanTM 752 content under this experimental conditions was 3%（mass）. Thickness of AgrilanTM 752 adsorbed layers decreased at initial pH 〉 6, zeta potential had a maximum value at initial pH -- 10. On the other hand, dispersion stability was good at initial pH from 2 to 10, and became worse with increasing initial pH value. Moreover, experimental results suggested that electrolyte ions, such as Na＋, Mg2＋ and Ca2＋ reduced thickness of AgrilanTM 752 adsorbed layers and zeta potential, and decreased the dispersion stability of imidacloprid suspension. Moreover, the ability of decreasing dispersion stability of imidacloprid suspension was Ca2＋ 〉 Mg2＋ 〉 Na＋ at the same concentration.

关 键 词：分散 吡虫啉 悬浮系 稳定性 双梳型共聚物 

分 类 号：TQ450.4[化学工程—农药化工]