Antifoaming Properties of Glycols. III.

Ethylene Oxide and Propylene Oxide Adducts

Abstract

The preparation and properties as an antif oamer of ethylene oxide and propylene oxide adducts of branched 1, 2-glycols, such as 2-butyloctane-1, 2-diol 2-hexyldecane-1, 2-dial, and 2-octyldodecane-1, 2-diol were described. The antifoaming power of these adducts was evaluated by the Ross and Miles method for the aqueous solution of sodium dodecylbenzenesulf onate. The results were presented as immediate reading of foam height (foam production) and reading of foam height after 5min (foam stability) as a function of concentration of the adducts. The results of these experiments are shown in Fig, -12O. It was clear that the introduction of 12 molecules of ethylene oxide or propylene oxide to branched 1, 2-glycols improved their antif oaming power considerably. Also it was found that the ethylene oxide adducts were more effective antifoamers than the corresponding propylene oxide adducts.