初次油水比对高效氯氟氰菊酯微囊悬浮剂理化特性的影响
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摘要
采用界面聚合法制备了以聚脲树脂为囊材的15%高效氯氟氰菊酯微囊悬浮剂。在制备过程中,以油相质量与初次用水质量相比得到初次油水比,探究了不同初次油水比对高效氯氟氰菊酯微囊悬浮剂理化性质的影响。设定4个不同初次油水比(R_i)处理,分别为R_i=1:0.55、1:0.69、1:0.83和1:0.97,通过光学显微镜、扫描电镜、激光粒度分布仪对所制备微囊的形貌进行表征,并测定包覆率与贮藏稳定性。结果显示:当R_i分别为1:0.83和1:0.97时,所制备的15%高效氯氟氰菊酯微囊悬浮剂成囊质量高,微囊形貌好,微囊包覆率90%以上,粒径3～4μm (D95),贮存稳定性合格。本研究可为制备高效氯氟氰菊酯微囊悬浮剂提供参考。
A 15% lambda-cyhalothrin microcapsule suspension of polyurea resin was prepared as a capsule material by interfacial polymerization. In the preparation of lambda-cyhalothrin microcapsule suspension, the initial oil-water ratio(R_i) was obtained by the quotient of the weight of the oil phase and the weight of the initial water. The effect of the R_i value on the physico-chemical properties of the lambda-cyhalothrin microcapsule suspension was also investigated. Four 15% lambda-cyhalothrin microcapsule suspensions treated with different initial oil-water ratios were prepared. Their R_i values were 1 : 0.55, 1 : 0.69, 1 : 0.83 and 1 : 0.97, respectively. The morphology of the microcapsules was characterized by optical microscope(OM), scanning electron microscope(SEM) and laser particle size analyzer. The encapsulation efficiency and storage stability of each treatment were determined. The experimental results showed that, when the R_i values were 1 : 0.83 and 1 : 0.97, the 15% lambdacyhalothrin microcapsule suspension had high capsule quality, good microcapsule morphology, and the microcapsule encapsulation efficiency was 90% or higher. The particle sizes were in the range of 3-4 μm(D95), and the storage stability has also be qualified. This study has provided a reference for the preparation of lambda-cyhalothrin microcapsule suspensions.
A 15% lambda-cyhalothrin microcapsule suspension of polyurea resin was prepared as a capsule material by interfacial polymerization. In the preparation of lambda-cyhalothrin microcapsule suspension, the initial oil-water ratio(R_i) was obtained by the quotient of the weight of the oil phase and the weight of the initial water. The effect of the R_i value on the physico-chemical properties of the lambda-cyhalothrin microcapsule suspension was also investigated. Four 15% lambda-cyhalothrin microcapsule suspensions treated with different initial oil-water ratios were prepared. Their R_i values were 1 : 0.55, 1 : 0.69, 1 : 0.83 and 1 : 0.97, respectively. The morphology of the microcapsules was characterized by optical microscope(OM), scanning electron microscope(SEM) and laser particle size analyzer. The encapsulation efficiency and storage stability of each treatment were determined. The experimental results showed that, when the R_i values were 1 : 0.83 and 1 : 0.97, the 15% lambdacyhalothrin microcapsule suspension had high capsule quality, good microcapsule morphology, and the microcapsule encapsulation efficiency was 90% or higher. The particle sizes were in the range of 3-4 μm(D95), and the storage stability has also be qualified. This study has provided a reference for the preparation of lambda-cyhalothrin microcapsule suspensions.
引文
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[2]BROWN E N,KESSLER M R,SOTTOS N R,et al.In situ poly(urea-formaldehyde)microencapsulation of dicyclopentadiene[J].J Microencapsul,2003,20(6):719-730.
[3]李北兴,张大侠,张灿光,等.微囊化技术研究进展及其在农药领域的应用[J].农药学学报,2014,16(5):483-496.LI B X,ZHANG D X,ZHANG C G,et al.Research advances and application prospects of microencapsulation techniques in pesticide[J].Chin J Pestic Sci,2014,16(5):483-496.
[4]朱峰,许春丽,曹立冬,等.农药微囊剂及其制备技术研究进展[J].现代农药,2018,17(2):12-16.ZHU F,XU C L,CAO L D,et al.Research advances of pesticide microcapsule and its preparative technique[J].Mod Agrochem,2018,17(2):12-16.
[5]袁昂,黄次沛.微胶囊农药概述[J].农药,2000(6):1-4.YUAN A,HUANG,C P.Overview of microcapsule pesticide[J].Agrochemicals,2000(6):1-4.
[6]王安琪,王琰,王春鑫,等.农药纳米微囊化剂型研究进展[J].中国农业科技导报,2018,20(2):10-18.WANG A Q,WANG Y,WANG C X,et al.Research progress on nanocapsules formulations of pesticides[J].J Agric Sci Technol,2018,20(2):10-18.
[7]董红强,徐好学,胡克德,等.分散乳化条件对氟乐灵微囊悬浮剂形成状态的影响[J].农药,2010,49(6):416-418.DONG H Q,XU H X,HU K D,et al.Effect of dispersion and emulsifying conditions on the appearance of trifluralin microcapsule[J].Agrochemicals,2010,49(6):416-418.
[8]郭雯婷,路福绥,庄占兴,等.乳化剂对乙草胺微胶囊悬浮剂形成的影响[J].农药,2010,49(11):804-806.GUO W T,LU F S,ZHUANG Z X,et al.The effects of emulsifier on microcapsule of acetochlor[J].Agrochemicals,2010,49(11):804-806.
[9]ANDERSSON TROJER M,WENDEL A,HOLMBERG K,et al.The effect of pH on charge,swelling and desorption of the dispersant poly(methacrylic acid)from poly(methyl methacrylate)microcapsules[J].J Colloid Interface Sci,2012,375(1):213-215.
[10]王芳,孙妍,何顺,等.制备工艺对丁硫克百威微囊理化特性的影响[J].农药学学报,2011,13(5):525-530.WANG F,SUN Y, HE S,et al.The effect of preparation procedure on physico-chemical properties of carbosulfan microcapsules[J].Chin JPestic Sci,2011,13(5):525-530.
[11]丁向东.用界面聚合法制备毒死蜱微胶囊悬浮剂[J].农药,2007,46(10):666-668.DING X D.Preparation of chlorpyrifos capsule suspension[J].Agrochemicals,2007,46(10):666-668.
[12]赵德,刘峰,慕卫,等.毒死蜱微囊悬浮剂的制备及微囊化条件的优化[J].农药学学报,2006,8(1):77-82.ZHAO D,LIU F,MU W,et al.Preparation of chlorpyrifos aqueous capsule suspension and optimization of encapsulation conditions[J].Chin J Pestic Sci,2006,8(1):77-82.
[13]LI M W,XU W M,HU D Y,et al.Preparation and application of pyraclostrobin microcapsule formulations[J].Colloids Surfaces Physicochem Eng Aspects,2018,553:578-585.
[14]丑靖宇,谭利,孙俊,等.330 g/L二甲戊灵微囊悬浮剂的制备[J].农药,2015,54(1):26-30.CHOU J Y,TAN L,SUN J,et al.Preparation of pendimethalin 330 g/L aqueous capsule suspension[J].Agrochemicals,2015,54(1):26-30.
[15]CHATZI E G,KIPARISSIDES C.Dynamic simulation of bimodal drop size distributions in low-coalescence batch dispersion systems[J].Chem Eng Sci, 1992,47(2):445-456.