Study On The Environmental Friendly Pesticide Formulation Based On The Green Surfactants

In recent years, as people’s consciousness of environmental protection get much stronger, the development and application of surfactants have been put forward higher request, the preparation and application of green surfactants have become the research focus. Compared with the traditional surfactant, green surfactant is refers to by natural or processing of renewable resources, to human body excitant small and easy to biodegradation of surfactants, green surfactant is produced by natural or renewable resources, mild to human body and easy to biodegradation. In surfactant industry, agricultural surfactant is an important field. The possibility of preparing the common pesticides formulation using the green surfactant, such as MES, APG, AEO, AEC, MAPK, AOS was studied. The results showed that using green surfactants alone or mixed system with traditional surfactants, bifenthrin50EW, bifenthrin50ME, emamectin benzoate30ME, emamectin benzoate50WDG,10000IU/mg Bacillus thuringiensis SC and10000IU/mg Bacillus thuringiensis WDG were prepared and their quality and technical indexes meet the requirements.Based on choosing the best mixing ratio and dosage of green surfactant and traditional surfactant respectively to prepare the bifenthrin50EW, comparison of the effect of the two types of surfactant on the effect on the stability was made and also, the emulsion instability mechanism and fast judgment method of stability of the emulsion were discussion, the results showed that,1) the stable nano-emulsions could be prepared by choosing the best mixing ratio and dosage of the two surfactants, when the mixing ratio of MAPK and AEO was6:4and the dosage was10%, the emulsion prepared with green surfactants was more stable and the original droplet size was200.7nm, while the mixing ratio of NP-10P and EL-60was5:5and the dosage was10%, the emulsion prepared with traditional surfactants was more stable and the original droplet size was288.9nm.2) The reason of why the emulsion showed the most stable was the mixed system of MAPK and AEO has the smallest cmc, ycmc, Acmc when the mixing ratio was6:4and the two emulsifiers have a synergistic effect.3) A good correlation of r3and time was obtained with good regression coefficient for all emulsions, indicating that Ostwald ripening was the driving force for instability.4) The dynamic light scattering technique can be replaced by short-term scan of stability analyzer to judge the stability of the emulsion.5) The increasement rate of droplet size of emulsion prepared with MAPK-AEO was smaller than that of NP-10P-EL-60, the emulsion prepared with green surfactant showed more stable.Based on choosing the best mixing ratio of green surfactants mixture and traditional surfactants mixture respectively using pseudo-ternary phase diagram to prepare the emamectin benzoate30ME, comparison of solubilising power on emamectin benzoate with two kinds of surfactants was made. The results showed that the micro-emulsion of emamectin benzoate was much easier to form when the MAPK: APG=2:1and NP-10P:OP-10=1:2, the solubilising power on emamectin benzoate of green surfactants mixture was low than that of traditional surfactants mixture.The bioassay in the room showed that the bioactivity on Mythimna seperata of bifenthrin50EW prepared with green surfactants had no marked difference with the emamectin benzoate30ME prepared with traditional surfactants. The bioactivity on Plutella xylostella of emamectin benzoate30’ME has the same result.The biodegradation experiment showed that the green surfactants have better bio degradation rate than traditional surfactants. Safety estimation of the two kinds of surfactants on zebra fish showed that the surfactants for test were all low toxic to zebra fish except the OP-10was moderate toxic and there was a difference of LC50value on zebra fish between green and traditional surfactants. Safety estimation of the two kinds of surfactants on Daphnia magna showed that the surfactants for test were all low toxic to Daphnia magna except the OP-10, MOA9PK, T-2700, NNO were moderate toxic and there was a difference of LC50value on Daphnia magna between green and traditional surfactants.Make certain the optimal HLB value to prepare bifenthrin50EW, lambda-cyhalothrin50EW and permethrin50EW by adjusting the mixing ratios of anion-nonionic surfactants with a constant total concentration (10%) using short-term scan of turbiscan lab stability analyzer. The optimal HLB value to prepare bifenthrin50EW, lambda-cyhalothrin50EW and permethrin50EW was10.82、9.48、10.15respectively. The quality and technical indexes all the formulation prepare with the best mixing ratio and the same surfactant concentration meet the requirements. The mixture of MAPK and AEO-3could be used for prepare pyrethroid pesticide emulsions. The best mixing ratio of MAPK and APG mixture to prepare avermectins30ME, emamectin benzoate30ME and ivermectin30ME was2:1,2:1,1:1using pseudo-ternary phase diagram to study. The quality and technical indexes all the formulation prepare with the best mixing ratio and the same surfactant concentration meet the requirements. The mixture of MAPK and APG could be used for prepare macrolides antibiotics pesticide micro emulsions.