Definition - What does Silicone Anti-fouling mean?
Silicone anti-fouling is the use of silicone-based compounds in coatings to prevent marine organisms from attaching and growing on submerged structures. The silicone-based compound is added to the coating as an additive or as the main component or binder of a resin. These silicone-based coatings are hydrophobic and produce smooth surfaces, which make it difficult for marine organisms such as algae, tubeworms and barnacles to attach to the coated surface.
Silicone-based anti-fouling paints are said to be “fouling-release” or “nonstick.” Marine organisms may still be able to bind to these surfaces, but with less strength so they are easily removed. Although the main purpose of these coatings is anti-fouling, some coatings may provide other useful properties such as anti-corrosion and temperature compatibility.
Corrosionpedia explains Silicone Anti-fouling
The anti-fouling properties of silicone-based coatings are modulated by the following factors:
- Surface energy
- Coating modulus (elasticity)
- Coat thickness
Although lowering the surface energy reduces the ability of organisms to attach, silicone anti-fouling is enhanced by modifying the coating’s elastic modulus and thickness.
Silicon anti-fouling coatings often consist of the following components:
- Epoxy or silane primer
- Elastomeric silicone tie coat
- Elastomeric silicone top coat with a release additive
Silicone anti-fouling solutions are an alternative to less desirable toxic solutions such as organo-tin compounds and copper-based systems.