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Surfactants in paint
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<p><a href="/facts/Paint/Q176AsIG">Paint</a> has four major components: <a href="/facts/Pigments/I3clCYkF">pigments</a>, binders, <a href="/facts/Solvents/LoMPMz8S">solvents</a>, and additives. <a href="/facts/Pigments/I3clCYkF">Pigments</a> serve to give paint its color, texture, toughness, as well as determining if a paint is opaque or not. Common white pigments include <a href="/facts/Titanium_dioxide/T0KWmKcz">titanium dioxide</a> and <a href="/facts/Zinc_oxide/P7sTyDez">zinc oxide</a>. Binders are the film forming component of a paint as it dries and affects the durability, gloss, and flexibility of the coating. Polyurethanes, polyesters, and acrylics are all examples of common binders. The <a href="/facts/Solvent/LoMPMz8S">solvent</a> is the medium in which all other components of the paint are dissolved and evaporates away as the paint dries and cures. The solvent also modifies the curing rate and viscosity of the paint in its liquid state. There are two types of paint: solvent-borne and water-borne paints. Solvent-borne paints use organic solvents as the primary vehicle carrying the solid components in a paint formulation, whereas water-borne paints use water as the continuous medium. The additives that are incorporated into paints are a wide range of things which impart important effects on the properties of the paint and the final coating. Common paint additives are catalysts, thickeners, stabilizers, emulsifiers, texturizers, biocides to fight bacterial growth, etc. </p> <p>The word <i>surfactant</i> is short for <i>surface active agent</i>. <a href="/facts/Surfactants/zgVX6g8o">Surfactants</a> are compounds that lower the surface tension of a liquid, the interfacial tension between two liquids, or the interfacial tension between a liquid and a solid. In solutions this behavior is known as <a href="/facts/Wetting/lGloJUzr">wetting</a>, and it occurs as a result of surfactants adsorbing to the air/water interface. Soluble surfactants are also capable of forming <a href="/facts/Micelles/eMG9whea">micelles</a> and other aggregate structures in solution, leading to a stabilizing effect in latex paints. Surfactants in paint are used to change many end properties of a dried paint, as well as to emulsify paints in their liquid state. </p>