USE OF SELEKTOPE IN POLYURETHANE MATERIAL AND SILICONE EPOXY COATINGS

Transcription

1 USE OF SELEKTOPE IN POLYURETHANE MATERIAL AND SILICONE EPOXY COATINGS Dan Isaksson, R&D Chemist, I-Tech AB Presentation to The International Congress on Marine Corrosion and Fouling 19th Conference (This version is adapted for the web) June 25, 2018

2 Introduction to Selektope Antifouling ingredient for marine coatings that prevents barnacle settlement on the hull. One of only three options available to prevent hard fouling. Repelling not killing. The effect of Selektope is reversible, i.e. once the barnacle larvae is out of the exposure area it is unaffected. Selektope does not kill the affected organisms. Potential to reduces biocide loadings. Selektope offers superior hard fouling prevention at very low concentrations ( % by weight in a coating). Mainly used in Asia and Europe Currently 7 commercial antifouling coatings containing Selektope on the market.

3 Challenges for current coating technologies Even though the performance of CDPs (controlled depletion paints), SPCs (self polishing coatings) and FRCs (foul release coatings) have been increasingly perfected over the years, there are still sometimes problems of biofouling attaching to coated surfaces. Regulations that require ships to have a clean hull to enter some harbours around the world are becoming more stringent, therefore the need for hull cleaning will increase.

4 Hull cleaning The cleaning of the hull may be conducted by divers or robots. This activity can potentially damage or reduce the lifetime of coatings It is not only ships that need to remain fouling free, other submerged surfaces/structures also need to stay fouling-free. For example fish farming nets

5 Challenge for submerged structure fouling Fenders, Buoys, Nets, Cables, Measuring/monitoring devices and Energy production devices can suffer from fouling. There is a lot of submerged equipment that could benefit from having an antifouling coated surface that currently may only be coated with ordinary marine paint for corrosion protection. The challenges with cleaning submerged surfaces and equipment calls for the development of new materials or combinations of materials that withstand cleaning and other kinds of mechanical wear.

6 Finding a solution screening suitable materials I-Tech, together with industry partners, has starting screening suitable materials either as coating or construction materials for submerged objects that are: Durable to withstanding cleaning / mechanical wear Slippery: to release fouling Permeable: to release biocides Materials already available that can be mixed or tweaked to improve fouling resistance are: Polyurethanes Silicone epoxies

7 Polyurethanes Test 1 Selektope concentration 0 0.1% 0.2% 0.5% 1% 0%

8 Test 1 results: May September % 0.2% 0.5% 1% 0% Selektope

9 Test 2 Polyurethanes: October November panel test conducted with only one formulation containing 0.37% Selektope versus a reference panel with 0% Selektope

10 Test 3 sprayed Polyurethane Spray application of Polyurethane, static and dynamic testing Polyurethane coating

11 Test 4: silicon epoxy coatings Wearlon products ( , , F-2M, F-3M) with 0% Selektope (reference purposes) or 0.3% Selektope. Paint application by roller. Submerged off west of Sweden in April At the 2 month inspection, all reference panels had plenty of barnacle fouling. Some of the test panels had a few barnacles attached except F-3M with 0.3% Selektope

12 Test 4: silicon epoxy coatings Last inspection November 2017 (at 18 months submerged time) Panel coated with F-3M with addition of 0.3% selektope had no fouling. Every other test panel was completely covered in fouling I-Tech is currently testing with F-3M and F-6M professionally applied by spraying.

13 Conclusion I-Tech has demonstrated that it is possible to protect submerged surfaces/object that are made out of polyurethanes and epoxies. Test results confirmed the prevention of barnacle settlement under static conditions over two seasons (summers). Collaboration opportunities: I-Tech is always interested to collaborate with paint and material manufacturers to develop next generation antifouling materials and surfaces.

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