Brominated Epoxy Antifouling Coating for Marine Hulls
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Solution Overview
Problem
Marine organism fouling on ship hulls increases friction, leading to decreased vessel speed and fuel efficiency, and existing antifouling paints containing copper and tri-organotin compounds pose environmental concerns, necessitating the development of copper-free and tri-organotin-free antifouling coatings.
Innovation Solution
A brominated epoxy resin-based antifouling coating composition that includes copper-free and tri-organotin-free antifouling agents, along with a surface additive to reduce adhesion and improve foul-release, formulated without persistent toxic derivatives, providing effective fouling reduction and environmental sustainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper or tri-organotin based antifouling paints are used, then antifouling effectiveness is improved, but environmental harm increases
Solution Approach 1:
The patent changes the chemical composition parameters by replacing copper and tri-organotin compounds with brominated epoxy resin as the active antifouling agent. This parameter substitution maintains antifouling effectiveness while eliminating the harmful environmental effects associated with traditional biocides, as brominated epoxy resin degrades to benign products including bromide ions and carbon dioxide.
Solution Approach 2:
The brominated epoxy resin coating provides effective antifouling protection during its service life and then degrades naturally in the environment. The coating is designed to be environmentally benign and self-decomposing, eliminating the need for persistent toxic substances like copper and tri-organotin that accumulate in marine ecosystems.
2Reliability
If traditional antifouling coatings are used, then hull fouling is reduced, but vessel speed and fuel efficiency decrease
Solution Approach 1:
The brominated epoxy resin coating provides antifouling protection that maintains vessel performance without requiring frequent manual intervention. The coating self-regulates by providing biocidal activity as needed, reducing fouling accumulation and maintaining optimal hull performance, thereby preserving vessel speed and fuel efficiency.
3Loss of time
If extended life antifouling coatings are used, then vessel downtime is reduced, but coating complexity increases
Solution Approach 1:
The patent uses a composite coating system where brominated epoxy resin is combined with appropriate carriers and adhesion promoters to create an extended life antifouling coating. This composite formulation provides long-lasting protection (reducing recoating downtime) while maintaining manageable formulation complexity through the use of standard coating components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The coating significantly reduces hull fouling, enhances fuel efficiency, increases vessel speed, and decreases recoating downtime while minimizing environmental impact by using non-persistent, non-toxic antifouling agents.
Implementation Method 1
Bromine compounds: Chemistry and Applications, D. Price, B. Iddon, and B. J. Wakefield, eds., Elsevier Science Publishers B.V., 1988, Ch. 2, Brominated marine natural products, pp. 121-144.
Implementation Method 2
The surface additive may lower the surface energy, lower adhesion, and improve foul-release.
Data Source
AI summary
Improved antifouling coatings for marine vessels are provided comprising a brominated epoxy resin. An antifouling composition is provided comprising a brominated epoxy resin, one or more copper-free and tri-organotin-free antifouling agents, optionally a surface additive, and further optionally a brominated additive. The antifouling compositions reduce hull fouling to improve the fuel efficiency and increase the speed of vessels, and decrease downtime required for recoating.