アクリル酸エステル型オリゴマーの泡消し性について
1986 年 35 巻 12 号 p. 1025-1030
詳細
1986 年 35 巻 12 号 p. 1025-1030
The following oligomers were prepared and their defoaming properties are discussed : poly [(2-ethylhexyl acrylate) -co- (2-hydroxyethyl acrylate)] P (IOA-HEA), poly [(n-octyl acrylate) -co- (2-hydroxyethyl acrylate)] P (NOA-HEA), poly [(2-ethylhexyl methacrylate) -co- (2-hydroxyethyl acrylate)] P (IOMA-HEA), poly [(n-octyl methacrylate) -co- (2-hydroxyethyl acrylate)] P (NOMA-HEA), poly [(2-ethylhexyl acrylate) -co- (2-hydroxyethyl methacrylate)] P (IOA-HEMA) and poly (n-octyl acrylate) -co- (2-hydroxyethyl methacrylate) P (NOA-HEMA). Their defoaming powers were evaluated by the Ross-Miles foam tester (JIS K3362) for aqueous solutions of sodium dodecylbenzenesulfonate (NaDBS), as foaming agent. The rate of adsorption of the oligomers at the aqueous solution/air interface was determined by the vibrating jet procedure.
The defoaming powers of the oligomers was found to depend on their molecular weight (Mn) and composition. P (IOA-HEA) showed the highest defoaming power. The most effective molecular weights for these oligomers were Mn 5001000. Oligomers containing IOA as a hydrophobic group showed better defoaming power than those containing NOA. The introduction of a methyl group to the oligomeric chain enhanced the instability of the foams.
