摘要
为探明水分散粒剂药液的润湿性能与甘蓝叶表层蜡质的关系,用5%甲维盐水分散粒剂配成浓度为0mg/L、2 mg/L、8 mg/L、32 mg/L的药液,研究其在正常甘蓝叶片和去蜡甘蓝叶片正反面的润湿行为,同时对药液中添加表面活性剂有机硅(Silwet-408)后在甘蓝叶片上润湿行为的变化进行了研究。结果表明:甘蓝叶片正反面的临界表面张力分别为28.51 mN/m和25.91 mN/m,去蜡后提高到34.90 mN/m和33.12 mN/m。各浓度甲维盐水分散粒剂药液的表面张力均大于甘蓝叶片的临界表面张力,接触角大于90°,60 s和120 s后的接触角变化率均小于0.05;蜡质去除后接触角显著减小且均小于90°,但最终仍不能完全润湿展布,接触角变化率均小于0.33。加入质量分数为0.01%的表面活性剂有机硅后,药液的表面张力均小于甘蓝叶片的临界表面张力,初始接触角均显著减小,60 s和120 s后的接触角变化率均显著增大,药液最终完全润湿展布。该研究结果对提高农药利用率和农药剂型的研制有参考价值。
In order to find out the relationship between the wetting characteristics of water dispersible granule（WDG） droplets and epicuticular wax of cabbage leaf,wetting behaviors of 0 mg/L,2 mg/L,8 mg/L,32 mg/L droplets of emamectin benzoate 5% WDG on the adaxial and abaxial surfaces of normal and dewaxed cabbage leaves were studied.The wetting behavior change after adding silicone surfactant into the solution was also studied.The results indicated that the critical surface tensions on adaxial and abaxial surfaces were 28.51 mN/m and 25.91 mN/m,respectively.After dewaxing,they increased to 34.90 mN/m and 33.12 mN/m.The surface tension of emamectin benzoate solution at each concentration was more than the critical surface tension of leaf.The contact angles of droplets on leaves were more than 90° and contact angle variation ratio within 60 s or 120 s was less than 0.05.After dewaxing,the angles were less than 90°,the ratio was less than 0.33,and the normal and dewaxed leaf surfaces were neither totally wet.After adding 0.01% silicone surfactant,the surface tension of solution was less than the critical surface tension of leaf;the momentary contact angle was significantly decreased,and the contact angle variation ratio was significantly increased,thus the leaf surface was totally wet.These results had scientific values for improving pesticide application efficiency rate and developing formulations of pesticide.
出处
《江苏农业学报》
CSCD
北大核心
2012年第6期1294-1299,共6页
Jiangsu Journal of Agricultural Sciences
基金
国家公益性行业(农业)科研专项(200903033)
关键词
甲维盐
临界表面张力
润湿行为
emamectin benzoate
critical surface tension
wetting behavior
