摘要
采用红外光谱、电位滴定、凝胶渗透色谱对改性木质素磺酸钠农药分散剂GCL4-1的分子结构进行了研究,结果表明,GCL4-1分子中磺酸基含量较改性前的木质素磺酸钠LS有明显提高,磺化度从改性前的1.33mmol/g增加到1.96mmol/g;其重均分子量9700,数均分子量2300。进一步研究了GCL4-1对农药水分散粒剂(WG)应用性能和药效等的影响,发现以GCL4-1作分散剂制备的WG具有良好的润湿性和崩解性,WG热贮前后的悬浮率都超过90%;WG悬浮液分散稳定性优良,2h后的悬浮液沉淀层厚度仅为0.386mm,颗粒粒径为7.22μm。制得的80%烯酰吗啉WG防治黄瓜霜霉病的EC90值为58.32mg/L,80%氟虫腈WG样品对小菜蛾的LC50值为0.5196mg/L,室内毒力达到了国外同类制剂最好产品水平。GCL4-1的综合性能达到甚至超过Borregaard公司的Kinsperse126,是一种具有优良性价比的绿色农药分散剂。
Structural characteristics of modified sodium lignosulfonate GCL4-1 were investigated with infrared spectrum, potentionmetric titration and gel chromatography, the result showed that GCL4-I＇s sulfonic group content was obviously increased compared with original sodium lignosulfonate LS, and its sulfonation degree was increased from original 1.33 mmol/g to 1.96 mmol/g; the weight and number average molecular weight of GCL4-1 were 9700 and 2300, respectively. Then influences of GCL4-1 on the applied properties of pesticide water-dispersible granules （WG） were further studied, when GCL4-1 was used as dispersant, the suspension percentages of WG before and after heated storage were both above 90%; the dispersion had excellent stability, the phase thickness of suspension was only 0.386 mm after two hours and the particle size was 7.22 μm. The value of EC90 of 80% dimethomorph WG＇ s control of cucumber downy mildew was 58.32 mg/L, and the value of LC50 of 80% fipronil WG samples on diamondback moth was 0.5196 mg/L, which meaned the indoor toxicity of the two WGs reached the level of the best foreign similar products. The comprehensive property of GCL4-1 is better than Kinsperse126 of the Borregaard company, which shows that GCIA-1 is a green pesticide dispersant with good performance price ratio.
出处
《中国农学通报》
CSCD
北大核心
2009年第24期364-368,共5页
Chinese Agricultural Science Bulletin
基金
广东省自然科学基金项目(8351064101000002)
广东省国际合作项目(2008B050100006)
关键词
改性木质素磺酸钠
农药
水分散粒剂
烯酰吗啉
氟虫腈
modified sodium lignosulfonate, pesticide, water-dispersible granules, dimethomorph, fipronil
