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The application of defoamers should not be underestimated.
Release Date:
2021-03-29
Defoamers, as the name suggests, are substances that eliminate foam. They possess low surface tension and high surface activity, enabling them to inhibit or remove foam from a system. During industrial production, numerous harmful foams can form, significantly impeding process efficiency; in such cases, defoamers must be added to eliminate these undesirable foams.
Defoamer In essence, it refers to the elimination of foam—substances with low surface tension and high surface activity that can suppress or remove foam from a system. During industrial production, large amounts of undesirable foam often arise, significantly impeding process efficiency; in such cases, defoamers must be added to eliminate this harmful foam.
Foam refers to a dispersed system in which gases such as air or carbon dioxide are distributed within liquids like water, oil, slurries, or dye solutions. Foams exist in two distinct states: dilute foam, where the interfacial forces between bubbles are weak and do not coalesce into larger aggregates; and concentrated foam, which is densely packed and constitutes the true foam. Typically, a small amount of a specific substance is added to dispersions such as slurries or dye solutions to suppress foam formation; this substance is known as an antifoaming agent.
During the warp sizing process, foam formation in the sizing vat or trough is due to the continuous and thorough contact between gas bubbles in the sizing liquor and the liquor itself. Because the gas constitutes the dispersed phase (the discontinuous phase) while the sizing liquor serves as the dispersing medium (the continuous phase), and given the substantial density difference between the two, the foam rapidly rises to the surface of the liquor. If the surface tension of the sizing liquor is low at this point, the entrained gas can break through the liquid–gas interface and coalesce into foam.
Thus, it is evident that the formation of foam requires three conditions: first, continuous and thorough contact between gas and liquid; second, when the density difference between the gas and the liquid is very large, the bubbles in the liquid can rise rapidly to the surface, eventually leading to foam formation; and third, liquids with lower surface tension are more prone to foaming.
There are broadly two approaches to foam elimination: physical methods and chemical methods. Defoamers can be used to remove harmful foam generated during production in industries such as latex manufacturing, textile sizing, coatings, petrochemicals, papermaking, industrial cleaning, and food fermentation.
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