30%吡虫啉悬浮剂中触变性稳定体系的构建

The Building of Stable Thixotropic Suspension Concentrate of 30% Imidacloprid

为了探寻解决农药悬浮剂贮存物理稳定性问题的新方法,本文以30%吡虫啉悬浮剂为例,在制剂配方中分别加入高黏凹凸棒土、普通凹凸棒土、镁铝硅酸盐和膨润土等可在悬浮体系中协同作用形成触变性结构的矿物质,并通过自然贮存和振荡处理后的析水率判断体系中触变结构的形成和可恢复性的强弱。结果表明,30%吡虫啉悬浮剂中加入高黏凹凸棒土、普通凹凸棒土、镁铝硅酸盐和膨润土后分别得到了具有不同可恢复性结构的触变性悬浮稳定体系,各自较佳用量分别为2%、2%、2%和3%。通过主要技术指标测定表明,农药触变性悬浮体系的分散性与制剂配方中加入的矿物质的种类及其用量有关;同时还发现用于评价农药悬浮剂体系物理稳定性的离心稳定指标与触变性悬浮剂实际室温自然贮存情况存在一定的差异。

In order to develop a new method to solve the physical stability of pesticide suspension concentrate, the high viscous attapulgite, common attapulgite, magnalium silicate and bentonite, which could form a thixotropic structure in the dispersion system, were added in the suspension concentrate of 30% Imidacloprid. The strength and the restructure ability of the thixotropic structure were characterized by the bleeding rate of water after nature storage and shaking treatment respectively. The results showed that the stable thixotropic suspension concentrate of 30% Imidacloprid could be achieved at the suitable contents of 2%, 2%, 2% and 3% of high viscous attapulgite, common attapulgite, magnalium and bentonite respectively. The dispersibility of pesticide suspension concentrate was not only related to the mineral categories but also to the minerals content. It was found that the results of centrifuge stability of suspension concentrate were not greatly related to the realities of the preparation stored in the room temperature.