Farhood Najafi - Department of Resin and Additives, Institiute for Color Science and Technology, Tehran,Iran
Behzad Shirkavand Hadavand - Department of Resin and Additives, Institiute for Color Science and Technology, Tehran,Iran
Mahdi Moosavi - Department of printing Science and Technology, Institiue for Color Science and Technology, Tehran, Iran

In this research, we have been synthesized novel cationic urethane Gemini surfactant (CUGS) as deinking agent in three steps. At the first, hyrophobically ethoxylate urethane with tertiary anine terminal group was preqared from lauryl alcohol 7mole ethoxylate (LA7EO), N,N-dimethylethanolamine (DMEA)and hexamethylene diisocyanate (HDI) in the presence of dibutytin dilaurate (DBTDL) as catalyst and acetone as a reaction solvent. In the second step, the CUGS was synthesized by quaternizing tertiary amine terminal group of hyrophobically ethoxylate urethane by 1,8- diboromooctane. Finally, acetone was removed by vacuum oven. The CUGA was characterized by H-NMR and FT-IR. The CUGS was investigated as deinking agent. In this study, a commercial polyethylene film with water based printing ink was deinked using cationic surfactant dodecyltimethylammonium bromide (DTAB) and CUGS as a novel cationic gemini surfactant. Solutions of CUGS hve been the most effective at deinking and were showed high efficiency at high pH levels. Deinking of CUGS is more effective than DTAB.

synthesis, gemini surfactant, deinking, uretheane