What Does Phenolic Alkyd Resin Mean?
Phenolic alkyd resins are alkyd resins modified with a phenolic resin in order to improve the properties of an alkyd resin for a particular application. The two resins that are combined are composed of different components. Alkyd resins are polyesters built from polyhydric alcohols and polybasic acids. Phenolic resins are polymers built from phenols and formaldehyde.
Phenolic alkyd resins are often used as marine paints for enhanced water resistance and on industrial machinery for enhanced chemical resistance. Other useful properties include good adhesion and corrosion resistance.
Phenolic alkyd resins may also be known as phenolic modified alkyd resins.
Corrosionpedia Explains Phenolic Alkyd Resin
One of the areas where alkyd resins can be enhanced is by increasing their resistivity to water and oils. While alkyd resins often contain fatty acid components (making them non-polar and water repelling) the connective ester bonds may decompose over time under conditions of extreme water exposure, such as water submersion. Phenolic resins, which offer high chemical and water resistance, can enhance the properties of alkyd resins for marine applications.
Modification with phenolic resins is also useful for applications where extra chemical and corrosion resistance is needed. Materials made with phenolic resins are often used as chemical resistant materials. Adding these properties to an alkyd resin enhances its utility as a reinforcing agent or as a finishing coat over other alkyd resins. As such, phenolic alkyd resins are promoted for use in marine paints, transport paints, industrial machinery, primers, corrosion resistant coatings, and paint finishes. However, phenolic alkyd resins tend to perform poorly against weathering.