Synergistic Fouling Control Technologies

Transcription

1 FP7 OCEAN project (614034) Collaborative project Synergistic Fouling Control Technologies Dorothea Stübing, John van Haare

2 Outline State of the art of fouling control technologies Objectives of Seafront Key data The Seafront approach Partners involved First results Fraunhofer IFAM

3 State of the art Fouling Problem The unwanted colonisation of marine/aquatic organisms on immersed substrates The impacts of fouling are: Economic and Environmental

4 State of the art Fouling Problem Case study for marine shipping Container vessel consumes 250 to 300 tonnes of fuel per day. Costs are around $150,000 per day Severe fouling increases hull roughness and drag Approx. 40% increase in fuel consumption greenhouse gas penalty Significant environmental impact release of biocides.

5 State of the art Fouling Control The biocidal approach Function by releasing biocides into the surrounding water. Rely on the biocide preventing or inhibiting settlement of fouling species. Uses device which controls the rate of biocide release. The non biocidal approach Function by preventing or reducing the adhesion of fouling organisms Fouling release. Rely on low adhesion and the movement of the vessel to remove fouling by hydrodynamic shear. A non stick / easy clean surface.

6 Biocidal antifouling Controlled release combined with self polishing to reduce friction and drag Copper acrylate Silyl acrylate Free association paint CO 2 Si i Pr 3 CO 2 Cu O 2 CR Seawater Seawater CO 2 Na CO 2 Na + Cu 2+ (aq) I2 + i Pr 3 SiOH Continuous release of biocides accumulating in aquatic environments.

7 Folie 6 I2 ipr3 IFAM;

8 Non biocidal antifouling Increased performance better deterrence at low shear (=vessel speed). Silicone based Fluoropolymerbased Increased performance (better deterrence, slower removal speed) Increasing hydrophilicity (lower contact angle) Elastomeric coatings with low bulk modulus damage sensitive! Nowadays even slime release products are on the market!

9 Objectives of Seafront (I) 1. Cost effective coatings solutions with reduced environmental footprint as determined by comparative life cycle and eco efficiency assessment* * Measurable parameters for evaluation include: total resource consumption, VOC, toxicity and environmental fate, non fossil derived carbon content and greenhouse gas emissions during in service lifetime % improvement in biofouling deterrence (% coverage) and/or biofouling release (% release at a given speed over time) as compared to latest state of the art commercial Intersmooth7460HS SPC (biocide based coating) and Intersleek900 (fouling release coating) reference controls. 3. Hydrodynamic drag reduction resulting in a consequent 5% improvement in operating efficiency as compared to that offered by Intersleek 900.

10 Objectives of Seafront (II) 4. In parallel, as an integral ethos within the project, a strong fundamental/mechanistic understanding and new performance predictive test methods will be developed to feedback and inform technology evolution and down select promising coating solutions for end user field trials. A B Water-filled chamber Thin-walled glass tube containing cyprids Cyprid exploring surface Camera 2 Camera 1 Surface of interest

11 Key data of Seafront Duration: 48 months 1 January 2014 till 31 December Budget: 11.2 million; EC funding 7.99 million. 19 partners involved: 8 SMEs, 4 MMEs, 2 RTOs, 5 UNIs. 7 EU member states and 1 associate country. 25% EC contribution should go to SMEs. I4

12 Folie 10 I4 maybe funding or contribution would be more appropriate terms for a research project? IFAM;

13 Seafront approach WP1 3: three different technology vectors for developing innovative control coatings: WP1 switchable, topographic surfaces WP2 chemically structured surfaces WP3 immobilization of bio actives WP4: surface characterization, settlement assays, hydrodynamic drag, new test method development and improved fundamental understanding down selection of promising candidates. WP5/WP6: benchmarking, up scaling of coating formulations, LCIA, raft and field end user trials demonstrate scalability and antifouling performance in real life

14 Partners involved

15 First results textured coatings WP1.1 Textured coatings Objectives: Understand the influence of surface texture and coating chemistry on biofouling and hydrodynamic drag Develop novel bio inspired coatings with a structured surface topography optimized to reduce hydrodynamic drag and a surface chemistry and modulus for broad spectrum biofouling control

16 First results textured coatings WP1.1: Textured coatings Background Surface texture inspired by skin of fast swimming sharks W. Hage, Diss Skin of bonnethead shark (Sphyrna tiburo), transversal section of placoid scale with riblets (arrows). psc = placoid scale, drm = skin. Scale bar = 50 μm ( Daehne & Watermann 2012).

17 First results textured coatings WP1.1: Textured coatings approach Application, embossing and curing in one single step

18 First results textured coatings WP1.1: Textured coatings previous work Application in shipping better riblet-coated smooth surface Measured dragreduction: max. 5.2 % worse

19 First results textured coatings WP1.1: Textured coatings chemically cured foul release coating Embossing of commercial fluoropolymer foul release coating 48 µm : 96 µm Hydrodynamic testing of coating types smooth vs. riblet structure Photos of coated T/C cylinders to be added

20 First results chemically structured surfaces WP2.2 Fluoro functionalized particles used as fillers Objectives: Development of materials and materials combinations which prevent biofouling based on a foul release mechanism. Task: Development of a sol gel process for the deposition of functional fluorosilanes and PEG silanes on suitable silica particles and characterization by: SEM: Surface topography TEM: Transmission information EDX: Surface element composition ATR IR: Chemical groups

21 First results chemically structured surfaces PFPE functionalized particles bi functional fluorosilane A bi functional fluorosilane B SiO 2 base particles mono functional fluorosilane A mono functional fluorosilane B

22 First results chemically structured surfaces PEG functionalized particles

23 Questions?