羧酸盐类聚电解质润湿分散剂的合成与应用

Synthesis and Application of Carboxylate Polyelectrolyte Dispersant

以甲基丙烯酸(MAA)、苯乙烯(St)和丙烯酸羟丙酯(HPA)为单体合成了羧酸盐类聚电解质分散剂,用于制备吡蚜酮水悬浮剂,研究了聚合物的结构、组成和化学性质对水分散体系的影响.优化得到最佳合成条件为:MAA50g,St20g,HPA20g,引发剂过硫酸铵9%(ω),在此条件下合成润湿分散剂SRF10,由红外和氢谱确定其结构,实验测定其亲水亲油平衡值为14.47,临界胶束浓度为1.14g/L(25℃),具有良好的润湿性,持久起泡性弱.用SRF10制备25%吡蚜酮水悬浮剂,其流动性、倾倒性、悬浮性和贮存稳定性良好,与国外助剂YUS-SC3相当.

The carboxylate polyelectrolyte dispersant was synthesized with methacrylic acid （MAA）, styrene （St）, and hydroxypropyl acrylate （HPA） as monomers, and applied for production of pymetrozine suspension concentrate, and then its aqueous dispersion was investigated as the function of structure and chemical properties of the copolymer. The orthogonal experiments were carried out, and the optimal conditions were obtained as： MAA 50 g, St 20 g, HPA 20 g, and initiator ammonium persulfate 9%（ω）. The structure of SRF10 was confirmed by 1H-NMR and FT-IR, and its hydrophile lipophile balance was 14.47, critical micelle concentration 1.14 g/L （25℃）, with good wettability and weak foamability. 25% pymetrozine suspension concentrate was processed with SRF10, obtaining favourable results of flowability, pourability, suspensiability and storage stability, which was similar to the dispersant YUS-SC3 abroad.