Preparation, Surface Activity and Application of Fluoro-Spreading Agent

Abstract

Ammonium perfluoro-2,5-bis (trifluoromethyl)-3,6-dioxopelargonate (FY1) was synthesized from perfluoro-2,5-bis (trifluoromethyl)-3,6-dioxopelargonic acid and ammonia in ether, and was characterized by IR and 1H NMR. Its surface activity and spreading performance on gasoline were investigated in detail. The critical micelle concentration (CMC) of FY1 in aqueous solution was 0.25 g / L, and the surface tension at CMC (ڃcmc) was 17.25 mN / m. The aqueous solution of FY1 could spread on the surface of gasoline, but the aqueous solution of FY1 mixed with sodium dodecyl benzene sulfonate (SDBS), sodium dodecyl sulfate (SDS), n-octanol, 2-ethyl hexanol or VF respectively could not spread on gasoline. However, the aqueous solution of two or three components of FY1 with anion fluoro-surfactant Intechem-1 and SDS or n-octanol could spread on gasoline, and the biggest covering degree on gasoline reached 80.2% in 10min. It can decrease the volatilization of gasoline and can be employed to develop a new aqueous film-forming foam for oil-fire fighting.