Fast UV-Curing of Anti-Corrosion and Anti-Stain Coatings with High Bio-Based Content (RFT-349)

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Invention Summary

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NDSU Scientists have developed a UV-curable anti-corrosion coating for metal and wood substrates.  The coating is curable in 30 to 60 seconds at room temperature under UV light.  Coating components include well-known materials, including UV-responsive photoinitiators, acrylated plant oil (providing hydrophobicity and contributing to physical barrier), and hyperbranched polyester (providing physical barrier to moisture).  Variations on this basic formula can be developed and optimized for specific substrates and environmental conditions to create highly functional anti-corrosion coatings with a high bio-based content.

Benefits

  • UV-curable in 30 to 60 seconds at room temp, providing rapid anti-corrosion protection with low energy input
  • Enhanced coating hardness, adhesion on aluminum and other substrates, crosslinking efficiency, impact resistance, tensile modulus and toughness, solvent resistance, and Tg
  • Suitable for metal and wood substrates
  • Superior anti-corrosion and anti-stain properties
  • High bio-based content

Invention Premise

Polyester hyperbranched acrylates (HBAs) with differing backbone Tg values and acrylate functionalities were formulated into ASBO-based UV-curable coatings with THFA as a reactive diluent. The addition of HBAs greatly enhanced the coating hardness, adhesion, impact resistance, tensile modulus and toughness, and Tg. The change of coating performance after HBA addition was attributed to the structural features of the more hydrophilic, higher Tg HBAs.  In addition, it was shown that thermal annealing of the UV-cured coating films further enhanced the soy-based coating film properties such as hardness, adhesion and Tg as a result of further reaction of residual acrylate groups in the coating films. The results showed that UV-curable coatings of reasonably high biorenewable content with much improved coating performance can be obtained using synthetic HBAs as efficient toughening agents.

Patents

This technology is patented with fully preserved US patent rights (issued US patent 8,815,969) and is available for licensing/partnering opportunities.

Contact

Henry Nowak, Technology Manager
hnowak@ndsurf.org
(701)231-8173

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