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Monday, 16 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Curing agent provides good corrosion resistance

Wednesday, 7 November 2012

A new amine technology has been developed for zinc-rich 2K waterborne epoxy primers.

The new curing agent delivers good corrosion resistance

Source: Martina Berg/Fotolia

The new curing agent delivers good corrosion resistance

Source: Martina Berg/Fotolia

While waterborne coatings are increasingly replacing solventborne paints, new waterborne epoxy resin and amine curing agent technologies provide good corrosion resistance when appropriate 2K formulations are used.

In the case of epoxy primers enriched with zinc for extra corrosion resistance, the challenge of incorporating a very high weight of zinc powder into an epoxy/curing agent binder system is compounded by zinc’s reactivity with protic components such as water, acidic solvents and dispersing aids.

Comparable or better results

A new amine technology has now been developed for zinc-rich 2K waterborne epoxy primers. At the same zinc loading, the corrosion performance using this curing agent with solid epoxy dispersions is comparable to, or better than, that achieved with traditional solventborne epoxy/polyamidoamine binders.

The zinc-rich paste based on this new curing agent shows no significant outgassing when the curing agent and epoxy components are mixed. Resulting pot life with the recommended solid epoxy dispersion is at least four hours.

A paper describing this new technology has appeared in the September issue of "Paint & Coaitings Industry”.

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