梳型碳氟高分子表面活性剂在硝磺草酮悬浮剂开发中的应用

Application of comb-type fluorocarbon polymer surfactant in the development of nitrosulfonone suspension concentrate

为了探讨新型梳型含氟高分子表面活性剂在硝磺草酮悬浮剂开发中的应用,分别以该类表面活性剂b1和b9为分散剂,以商品化分散剂YUS-FS3000为对照,分别制备了25%硝磺草酮悬浮剂,并测定了其悬浮率、粒径、入水分散性和稳定性等理化性质,室内除草活性,以及分散剂b1的添加量对以上性能的影响。结果表明:以b1和b9为分散剂制备的硝磺草酮悬浮剂,在热贮、低温和冷冻3种条件下分别贮存14 d,其有效成分含量在25.52%~26.98%之间,3种条件下有效成分质量分数均为合格;同时,在3种贮存条件下的悬浮率均高于98.0%,且以b1为分散剂时,其分散性和稳定性优于以YUS-FS3000为分散剂;即使b1的添加量(质量分数)为2%时,在3种条件下分别贮存14 d,其有效成分含量在25.62%~26.01%之间,同时其悬浮率高于99.0%。3种25%硝磺草酮悬浮剂对稗草Echinochloa crusgalli的GR_(50)值(使杂草生物量降低50%的除草剂剂量)分别为有效成分29.03(YUS-FS3000)、15.70(b1)和10.19(b9)g/hm^(2)。

In order to explore the application of new comb-type fluorine-containing polymer surfactants in the development of nitrosulfonone suspension concentrate,25%nitrosulfonone suspension concentrates with different dispersants were prepared by taking such surfactants b1 and b9 as dispersants and commercial dispersant YUS-FS3000 as control.The physicochemical properties such as suspensibility,nominal size,dispersibility in water,and stability,biological activity in a greenhouse,and the effect of the addition amount of dispersant b1 on the above properties were measured respectively.The results showed that the active ingredient content was 25.52%-26.98%under the three conditions of 54℃,0℃,and−18℃for 14 days,which was qualified under the three conditions.At the same time,the suspensibility was higher than 98.0%under three storage conditions,and the suspension concentrate prepared by b1 was better than that by YUS-FS3000 as dispersant.Even if the addition amount(mass fraction)of b1 was 2%,the active ingredient content was between 25.62%and 26.01%after being stored for 14 days under three conditions.At the same time,the suspensibility was higher than 99.0%under three storage conditions.The GR_(50)(50%growth reduction)values of 25%mesotrione aqueous suspension concentrate prepared by these three dispersants on Echinochloa crusgalli(L.)Beauv were 29.03(YUS-FS3000),15.70(b1)and 10.19(b9)g(a.i.)/hm^(2),respectively.