A defoamer or an anti-foaming agent is a chemical additive that reduces and hinders the formation of foam in industrial process liquids. Commonly used agents are insoluble oils, polydimethylsiloxanes and other silicones, certain alcohols, stearates and glycols. The additive is used to prevent formation of foam or is added to break the macro- and micro-foam. Macro-foam is often formed at the surface of the coating and microfoam is entrapment of air bubbles what is not able to raise fast enough to the surface. For micro foam you need a so-called air release agent to coagulate the micro bubbles to bugger air bubbles so they can rais faster to the surface to be destroyed.
In industrial processes, foams pose serious problems. They cause defects on surface coatings. They prevent the efficient filling of containers. A variety of chemical formulae are available to prevent formation of foams.
Generally a defoamer is insoluble in the foaming medium and has surface active properties. An essential feature of a defoamer product is a low viscosity and a facility to spread rapidly on foamy surfaces. It has affinity to the air-liquid surface where it destabilizes the foam lamellas. This causes rupture of the air bubbles and breakdown of surface foam. Entrained air bubbles are agglomerated, and the larger bubbles rise to the surface of the bulk liquid more quickly.
|120 S||Non-silicone||■||0.1-1.0||Strong defoamer especially against macro-foam, can cause haze in high gloss clear coatings|
|130 S||Non-silicone||■||0.1-1.0||Strong defoamer, with improved compatibility compared to 120S|
|131 S||Non-silicone||■||0.1-1.0||Strong defoamer, very suitable for clear and pigmented coating|
|132 S||Non-silicone||■||■||0.1-1.0||Strong defoamer, very suitable for clear coating, espcially against popping and pinholing.|
|150 S||Non-silicone||■||■||0.1-1.0||Strong defoamer, very suitable for self leveling clear floor coatings. Doesn't cause haze or turbidity in the dry film.|
|152 S||Non-silicone||■||■||0.1-1.0||Strong defoamer, very suitable for self leveling floor coatings like epoxy and coil coating. Fast air-release and defoaming properties and excellent film properties.|
|155 S||Non-silicone||■||■||0.1-1.0||Strong defoamer, very suitable for self leveling epoxy floor coatings. Fast air-release and defoaming properties and excellent film properties.|
|170 S||Non-silicone||■||■||0.1-1.0||Suited for UPE, HS coatings like epoxy and 2K PU|
|175 S||Non-silicone||■||■||0.1-1.0||Suited for OPV, UV and High gloss coatings|
|180 W||Non-silicone||■||0.3-3.0||Levelling and anti-popping additive.|
|235 S||Silicone||■||0.1-0.6||All round defoamer for spray, rolling, brushing and curtain coatings|
|238 S||Silicone||■||0.1-0.7||Easy incorporable for top and clear coating|
|245 S||Silicone||■||0.1-0.6||Alround defoamer for spray, rolling, brushing and curtain coatings. Very good working against micro foam.|
|265 W||Silicone||■||0.1-1.0||Strong defoamer for grinding conditions, long lasting, low dosage.|
|272 S||Silicone||■||■||0.1-1.0||Very suited for self leveling epoxy, HS- epoxy, 2K PU and HS 2K PU coatings/primers.|
|280 W||Silicone||■||0.1-1.0||Defoamer for high gloss coating,coating systems, excellent compatibility|
|290 W||Silicone||■||0.1-1.0||Excellent effectiveness against micro-foam in airless/airmix|
|295 W||Silicone||■||0.1-1.0||Strong high shear stable defoamer for grinding processes|