梳型聚羧酸盐分散剂的合成及其在吡虫啉水悬浮剂中的应用

Synthesis of Comb Polymer Carboxylic Dispersant and Its Application in Imidacloprid Aqueous Suspension Concentrate

以马来酸酐(MA)和聚乙二醇200(PEG200)为原料,通过酯化反应制得大分子马来酸聚乙二醇酯(MAPEG),再与丙烯酸(AA)、甲基丙烯酸甲酯(MMA)通过自由基聚合反应制得3种梳型聚羧酸盐分散剂,研究了不同单体比例的聚合物分散剂在600 g/L吡虫啉水悬浮剂中的流点、粘度和Zeta电位.结果表明,当单体摩尔比MAPEG:AA:MMA为1:8:2、共聚物分散剂添加量为6%(ω)时,悬浮液粘度最小,为600 MPa·s,热贮前后悬浮率分别为93.7%±0.22%和92.3%±0.12%,粒径分别为3.26和3.88μm,分散效果与市售同类产品亨斯迈2500相当.

The macromolecular monomer, maleic acid polyethylene glycol ester （MAPEG）, was prepared by maleic anhydride （MA） and polyethylene glycol （PEG） as raw materials. Three kinds of comb-style carboxylic dispersants were synthesized with MAPEG, acrylic acid （AA） and methyl methacrylate （MMA） by radical polymerization at different monomer ratios. Application of the dispersants in 600 g/L imidacloprid aqueous suspension concentrate was investigated through determination of flow point, viscosity and Zeta potential. The results showed that the optimal molar ratio of MAPEG：AA：MMA was 1：8：2. When the dosage of dispersant was 6%（ω）, the minimum viscosity of suspension was 600 MPa.s. The suspension rates before and after heat storage were 93.7%±0.22% and 92.3%＋0.12%, and the particle size 3.26 and 3.88 μm. The effect of dispersion was equal to commercial Huntsman 2500 product.