Synthesis and Application of a Polymerizable Cationic Surfactant DMDB for Pigment Dispersions

A polymerizable cationic surfactant methacryloxyethyl-dodecyldimethylammonium bromide(DMDB) was synthesized by reaction of dimethylaminoethyl methacrylate and 1-bromododecane at 50 ℃ for 20 h.The product is characterized by FTIR and 1HNMR,and its critical micelle concentration and Krafft point were investigated.In addition,the surfactant was used as a dispersing agent to prepare ultra-fine pigment dispersions by way of ultrasonic.The properties of the dispersions were researched as the DMDB mass fractions were 0.1%,0.3%,0.5%,0.7% and 1%.The results show that when the surfactant mass fraction was above 0.3%,the particle size of the dispersions would be lower than 300 nm,its Zeta potential was about 25 mV,and its centrifuging stability would be better.