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May 25, 2018
Grease and oil-based defoamers
Type silicone oil is directly used as defoamers, ointment type silicone oil is added to silica dubbed ointment form defoamers, mainly for anti-foaming non-aqueous systems.
Silicone oils of different viscosities, the same mineral oil foaming system showed different anti-foaming effect. Those who have low viscosity and good defoaming dispersion, but the suppression of persistent lack of bubbles. High viscosity by breaking foam relatively slow, but persistent good suds.
In practice, in order to take into account the above-breaking foam and persistent, you can take the high, low viscosity dimethicone two kinds of use after blending.
Dimethicone more as oil, transmission oil within the add defoamer defoamers, and crude oil exploration, refining, heavy oil cracking process and other processes. Silicone anti-foaming effect depends on the degree of dispersion in the foaming system. Silicone particles dispersed only to 100μm or less anti-foaming effect. To 20μm or less dispersion was stable. In order to improve the degree of dispersion by means of mechanical agitation, such as high-speed high-speed stirring under heating, or pre-formulated with a colloid mill one silicone oil - mineral uniformly dispersed liquid silicone oil as defoamers. Other additives may also be by means of a mineral oil of surface activity. Such as silicone oil previously mixed with detergent or rust inhibitors added together after mineral oil. And advance with silicone paste dubbed silica defoamer by means of silica dispersion to use.