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Sep 22, 2016
It can be defined as the foam of air bubbles in aliquid medium in a stable dispersion. If the general air into the liquid, thebubble generated can assume a spherical shape. Since the air is lessdense than the liquid, and thus it will migrate to the surface, when the gasreaches the surface of the liquid without surfactant, the bubble will burst, theair inside the bubble dissipates, the liquid surrounding the bubble in theprevious and together. Thus, the pure liquid (liquid containing nosurfactant) there is no bubble.
In a liquid containing a surface active agent, aspherical bubble rising, into a stable macro bubble (big bubble). While these bubblesrise to the air interface, but which is encircled by a layer of surfactantmolecules. On the air interface also has a layer ofsurfactant molecules of the surface film, and therefore, when the bubbles riseto the surface to form a double layer. Double layerthickness of up to several microns, these small surface of the foam is verystable and difficult to eliminate. Bubbles rise to thesurface to form a foam crown increased. As the liquid is discharged from thedouble layer, the microbubbles will be transformed into a stable macro dynamicsbubble, foam and foam crowns double layers were thin, the foam easily burst.
Foam stability is affected by several factors. Onefactor which is stable thin sandwich, sandwich the liquid inside can’t bedischarged or discharged slowly. Also electrostatic repulsion occupy themezzanine between ionic surfactants also prevents the bubble burst. Another factorprompting the foam stabilizer is Gibbs elasticity. By stretching a film havinga surface-active substance, such an elastic effect will be shown. In this case, thesurface of the double layer is expanded, resulting in local concentration ofthe surfactant reduces the surface tension rises. The film is stretchedlike an elastic layer of the skin, like poly interference, Shidao surfacetension as low as possible.
Water-based coatings and inks in the manufacturing orconstruction process will produce foam. Manufacturing processof mixing, dispersing, or filter, so that the foam is formed and rises crown,it will extend the production time and reduce the effective volume of thesystem. Construction, build stable foam on the air interfacein the film after drying will have a common surface defects. During printing inkfoam damage mobility, even under the most adverse conditions caused by theoverflow of the ink from the work tank.