I am interested in learning on the topic of VOCs emission by marine coating. I have read some articles which claim that VOCs emission does not only emitted during the initial stage of application, but can continue to do so for a long period of time. As such, I have been thinking, since coating applied on marine vessel is exposed to the aggressive solution of seawater, wont this accelerate the oxidation of the coating and faster released of VOCs?
I try to find any articles in relate to the topic and idea, but sadly I cannot find much. Any help would be much appreciated. Thank you in advance !
Dear Wan,
thanks for the interesting question you made.
Generally speaking, the VOC emission by a paint is related either to the organic solvent or cosolvent used (only in the case of solventborne systems) or to the unreacted monomer. Is it true that a not optimized systems can present a slow release of VOCs along the time but, to be introduced in a market place, the regulation (https://www.coatings.org.uk/vocproductregulations.aspx) imposes that, in the case of the unreacted monomer, the concentration should be very low depending to the final application.
However, depending of the polymer, is quite common using post-polymerization step to break-down the unreacted monomer concentration.
With respect to the coatings used in the marine environment, due to the aggressive salt water the degradation (not oxidation) of the coating happens after some time and the release of part of the paint (by delamination, blistering and deterioration of the substrate) occurs instead of the VOCs release. Said so once the coating formulation is optimized (low concentration of unreacted monomer and optimal film formation, which means lowest concentration of retained solvent) the VOCs release after some time from the coating casting is not likely to occurs.
However this is an interesting and always evolving topic and if you find any interesting additional information please share with us.
Here you can find some book on the general information about the application and performance of anticorrosion organic coating
- Sander, J. (2010). Anticorrosive Coatings. Vicentz Network, Hanover, Germany.
- Knudsen, Ole Øystein, and Amy Forsgren. Corrosion control through organic coatings. CRC Press, 2017.
Best
Stefano
Dear Wan,
thanks for the interesting question you made.
Generally speaking, the VOC emission by a paint is related either to the organic solvent or cosolvent used (only in the case of solventborne systems) or to the unreacted monomer. Is it true that a not optimized systems can present a slow release of VOCs along the time but, to be introduced in a market place, the regulation (https://www.coatings.org.uk/vocproductregulations.aspx) imposes that, in the case of the unreacted monomer, the concentration should be very low depending to the final application.
However, depending of the polymer, is quite common using post-polymerization step to break-down the unreacted monomer concentration.
With respect to the coatings used in the marine environment, due to the aggressive salt water the degradation (not oxidation) of the coating happens after some time and the release of part of the paint (by delamination, blistering and deterioration of the substrate) occurs instead of the VOCs release. Said so once the coating formulation is optimized (low concentration of unreacted monomer and optimal film formation, which means lowest concentration of retained solvent) the VOCs release after some time from the coating casting is not likely to occurs.
However this is an interesting and always evolving topic and if you find any interesting additional information please share with us.
Here you can find some book on the general information about the application and performance of anticorrosion organic coating
- Sander, J. (2010). Anticorrosive Coatings. Vicentz Network, Hanover, Germany.
- Knudsen, Ole Øystein, and Amy Forsgren. Corrosion control through organic coatings. CRC Press, 2017.
Best
Stefano
Dear Dr. Wan Mohamad Ikhmal ,
reduction of VOC emissions is an important goal for all the “coating system” (primer, intermediate, top coat).
As for the coatings for marine use, the focus is mainly on the part of a new cycle of painting or maintenance (total or partial).
Below, you can find some documents/notes that may be of interest to you:
- New Marine Primer Reduces VOC Emissions by 80–90%
By Coatigs Tech (2019)
Available at: https://www.paint.org/article/new-marine-primer-reduces-voc-emissions-by-80-90/
- Industrial Coatings Segment Tackles VOC Issues
By Coatingsworld (2012)
Available at: https://www.coatingsworld.com/issues/2012-06/view_europe-reports/industrial-coatings-segment-tackles-voc-issues
- Standardsand guidelines for the Reduction of VOC Emissions from CanadianIndustrial Maintenance Coatings
By CCME (2002)
Available at: https://www.ccme.ca/files/Resources/air/emissions/pn_1320_bookmarks_e.pdf
- Alternative Control Techniques Document: Surface Coating Operations at Shipbuilding and Ship Repair Facilities
By EPA (1994)
Available at: https://www3.epa.gov/airquality/ctg_act/199404_voc_epa453_r-94-032_shipbuilding_repair.pdf
Best regards, Pierluigi Traverso
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