2-丙烯酰胺基-2-甲基丙磺酸改性环氧树脂的水性化

以中等相对分子质量的环氧树脂为原料、2-丙烯酰胺基-2-甲基丙磺酸（AMPS）为改性剂，过氧化笨甲酰为自由基引发剂，制备了稳定的环氧树脂乳液；以产物AMPS-EP的收率和水分散性、反应体系的酸值、特性粘数随时间的变化规律为考察对象，对AMPS改性环氧树脂的反应历程进行了推断。结果表明，在反应过程中，AMPS与环氧树脂主链的接枝反应度与环氧基团的开环酯化反应同时进行。AMPS-EP的收率及水分散性与反应时间有关，反应进行2h时，产物具有较高的水分散性；但超过3．5h后，随着反应时间的延长，聚合物的水分散性变差。红外光谱分析结果表明，改性产物AMPS-EP含有环氧基、磺酸基与磺酸酯基。

Waterborne epoxy resin modified by 2-acrylamido-2-methyl-propanesulfonic acid

A stable epoxy emulsion was prepared using epoxy as raw material,2-acrylamido-(2-methyl)-propanesulfonic acid(AMPS) as modifier and BPO as initiator.By criterion of productive rate of AMPS-EP,water-solubility,change of the acid value and intrinsic viscosity along with reaction time,the copolymerization course was deduced.The results show that during the process,2-acrylamido-2-methyl-propanesulfonic acid takes part in both the grafting copolymerization with epoxy principal chain and the ring-opening polyaddition with epoxy group.The productive rate of AMPS-EP and water-dispersing vary with reaction time.When the reaction time reaches 1.5 h,AMPS-EP is of good water-solubility;but the water-solubility becomes bad gradually when the reaction time exceeds 3.5 h.IR spectrum analysis indicates that AMPS-EP contains epoxy groups,sulfonic acid groups and sulfonic ester groups.