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Surfactant leaching of acrylic (latex) paints, also known as exudate staining, streak staining, streaking, weeping, exudation, etc., occurs when the freshly painted surface becomes wet and water-soluble components of the paint (
p. 28
/ref> This may happen, e.g., due to rain or dew for exterior surfaces, or water vapor condensation on interior ones. On the external surfaces the streaks will normally weather off in several weeks, and removal of them before that time is impractical, especially because it may damage the paint before it is completely cured. The streaking phenomenon may also be observed for some
p. 685
/ref>
Surfactant leaching of acrylic (latex) paints, also known as exudate staining, streak staining, streaking, weeping, exudation, etc., occurs when the freshly painted surface becomes wet and water-soluble components of the paint (dispersant
A dispersant or a dispersing agent is a substance, typically a surfactant, that is added to a suspension of solid or liquid particles in a liquid (such as a colloid or emulsion) to improve the separation of the particles and to prevent their sett ...
s, surfactant
Surfactants are chemical compounds that decrease the surface tension or interfacial tension between two liquids, a liquid and a gas, or a liquid and a solid. The word ''surfactant'' is a Blend word, blend of "surface-active agent",
coined in ...
s, thickeners, glycol
A diol is a chemical compound containing two hydroxyl groups ( groups). An aliphatic diol may also be called a glycol. This pairing of functional groups is pervasive, and many subcategories have been identified. They are used as protecting gro ...
s, etc.) leach out of the paint in sticky brown streaks.Handbook of Odors in Plastic Materialsp. 28
/ref> This may happen, e.g., due to rain or dew for exterior surfaces, or water vapor condensation on interior ones. On the external surfaces the streaks will normally weather off in several weeks, and removal of them before that time is impractical, especially because it may damage the paint before it is completely cured. The streaking phenomenon may also be observed for some
silicone
In Organosilicon chemistry, organosilicon and polymer chemistry, a silicone or polysiloxane is a polymer composed of repeating units of siloxane (, where R = Organyl group, organic group). They are typically colorless oils or elastomer, rubber ...
sealant
Sealant is a substance used to block the passage of fluids through openings in materials, a type of Seal (mechanical), mechanical seal. In building construction ''sealant'' is sometimes synonymous with ''caulk'' (especially if acrylic latex or ...
s.
The leaching effect should be taken into an account by manufacturers when formulating latex paints. A common approach is replacing water-soluble ingredients with volatile organic compound
Volatile organic compounds (VOCs) are organic compounds that have a high vapor pressure at room temperature. They are common and exist in a variety of settings and products, not limited to Indoor mold, house mold, Upholstery, upholstered furnitur ...
s (VOCs), which are not environmentally safe.crylates—Advances in Research and Application: 2013 Edition, Chapter 2: Metacrylatesp. 685
/ref>
See also
*Exudate
An exudate is a fluid released by an organism through pores or a wound, a process known as exuding or exudation.
''Exudate'' is derived from ''exude'' 'to ooze' from Latin language, Latin 'to (ooze out) sweat' (' 'out' and ' 'to sweat').
Medi ...
References
{{reflist, 2 Paints Solid-solid separation