SPONSORS OF COATINGS AND CORROSION FEATURE
INNOVATION FROM A PROVEN FORMULA FOR CORROSION PROTECTION
Technology development does not stand still and so it is with a well proven formulation for corrosion protection of steel structures in aggressive marine environments.
SOLVENT FREE POLYURETHANE A UK formulated and developed solvent free polyurethane has been protecting steel structures in aggressive environments including off shore North Sea, marine, bridges and structures and water retaining structures for over twenty five years.
There is recorded track record and independent survey reports confirming the effectiveness of this high build, flexible, impact and abrasion resistant elastomeric coating which when correctly specified and applied has proved to keep corrosion at bay for over twenty five years and many of the structures surveyed have been forecast to have a further twenty years or more corrosion free life.
Unlike paint systems which over time will absorb water and oxygen this formulation at a film thickness of 1mm provides a complete water proof membrane with the lowest recorded moisture vapour and oxygen transmission.
SURFACE COLOUR STABILITY The only negative is colour stability, as being based on aromatic solvent free polyurethane resins, any light shade will quickly change when exposed to sunlight. This is purely a surface effect and the coating is not adversely affected by UV exposure.
To achieve colour stability in white and light shades it is necessary to overcoat the solvent free polyurethane with a colour stable cosmetic top coat which could be solvent or water based aliphatic polyurethane.
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These cosmetic top coats are however only applied at a film thickness of 50 to 100 microns and do not have the proven twenty five years maintenance free track record therefore subsequent cosmetic over coating may become necessary in the future.
SOLUTIONS There are two possible answers to this problem both based on aliphatic polyurethane chemistry.
ADVANCED SOLVENT FREE POLYURETHANE/UREA FORMULATION The first is an advanced solvent free polyurethane/urea formulation as a cosmetic top coat with outstanding colour stability and gloss retention which can be applied at up to 200 microns film build in a single coat application over the previously applied high build solvent free polyurethane and will have the same longevity as the parent solvent free elastomeric coating.
PROVEN TRACK RECORD This formulation has proven track record as a deck and top side coating on marine vessels over single pack moisture curing urethane primer where impact and abrasion resistance and colour stability have been outstanding.
It could also be applied to all sound existing paint systems and aged solvent free polyurethane to provide a colour-stable cosmetic top coat. Also improved durability of the existing coating as adhesion levels with the single pack moisture cured primer are of the highest order and film thickness of over 200 microns could be achieved in two coating applications therefore providing a relatively high film build encapsulation compound to the aged sound paint system.
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