Study On The Screening And Stability Of Two Pesticide Dispersible Oil Suspension Formulations

Dispersible Oil Suspension is an environmentally friendly formulation developed on the basis of emulsifiable concentrates and suspending agents.It combines the high efficiency of traditional emulsifiable concentrates and the environmental protection of water suspending agents.At the same time,the processing technology is simple and the water dispersibility is relatively excellent.It has good permeability and is safe to use.It is currently a relatively wide range of environmentally friendly pesticide formulations.In this paper,the compound of the insecticide bifenthrin and dinotefuran,and the compound of the herbicide oxyfluorfen and glufosinate are the research objects,and the stability of the dispersible oil suspension concentrate components on the system is screened out Corresponding dispersible oil suspension formulations are presented.The main research contents and results are as follows:In this paper,the relative additives were screened by the viscosity curve method,surface tension method and other methods combined with water-based laser particle size analyzer,rheometer and other instruments,and the excellent 17.5%bifenthrin·dinotefuran dispersible was obtained.Oil suspension agent.17.5%bifenthrin·dinotefuran dispersible oil suspension formulation composition:2.5%bifenthrin,15%difenteran,13%OE08,0.5%550LN,2.5%ODgel 05,1.0%AR200,oil Make up the methyl ester to 100%;study the stability of the 17.5%bifenthrin·dinotefuran dispersible oil suspension formulation from the preparation process of the dispersible oil suspension concentrate,additives and other factors.The results show that:（1）The best ratio of zirconium beads for the preparation of 17.5%bifenthrin·dinotefuran dispersible oil suspension concentrate is 2.5 times,the best speed is 2000r/min,and the sanding time is 150min;（2）the amount of emulsifier and The amount of dispersant will have a relative impact on storage stability.The types and dosages of emulsifiers,dispersants and thickeners were screened by surface tension method,HLB value method,viscosity curve method and other methods,and the excellent performance of 20%carbofluorfen·glufosinate was obtained.Phosphorus dispersible oil suspension formulation,the formulation composition is:0.7%acifluorfen,19.3%glufosinate-ammonium,9.1%500#,7.9%RP500,2.0%DA655,2.5%Attagel 50,2.0%AR200,oleic acid The methyl ester is made up to 100%.Through the related performance measurement,the result shows that all indexes meet the requirements.The preparation process of 20%carboflufen-glufosinate dispersible oil suspension was explored,and the results showed that the best zirconium bead multiple for preparing 20%carboflufen-glufosinate dispersible oil suspension was 2.0 The speed of sanding is2400r/min,and the sanding time is 150min.At the same time,the influence of the amount of emulsifier and dispersant of this formula on the stability of the system was explored,and the results showed that the amount of both will have an impact on the stability of the system.High performance liquid chromatography was used to analyze the content of the four active ingredients in the two formulas.The bifenthrin chromatographic conditions were:Eclipse-XDB-C18 chromatographic column,the mobile phase was methanol and water,and the volume ratio was 87:13,detection wavelength is 220nm,flow rate is 1.0m L·min^-1retention time is about 17min;Dinotefuran detection chromatographic conditions are:Eclipse-XDB-C18 chromatographic column,mobile phase is methanol and water,volume ratio is 60:40,the detection wavelength is270nm,the flow rate is 1.0m L·min^-1,and the retention time is about 2.5min;the chromatographic conditions of acifluorfen are:Eclipse-XDB-C18 chromatographic column,and the mobile phase is methanol:water:acetic acid=75:25:0.2,the detection wavelength is 230nm,the flow rate is 1.0m L·min^-1,and the retention time is about 14min;the efficacy test of 17.5%bifenthrin and dinotefuran dispersible oil suspension was performed,and it was found that 17.5%Bifenthrin·Dinotefuran dispersible oil suspension in purple cabbage,using spray method,when the application concentration is 63～84g/hm²,the control effect of yellow striped beetle is better.