Biocidal Composite Material for Controlled Anti-Fouling Release
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Solution Overview
Problem
Existing methods for preventing the growth of unwanted fouling organisms, such as mosses, algae, and lichen, are either costly, environmentally harmful, or provide inconsistent biocidal metal release, leading to structural damage and aesthetic degradation.
Innovation Solution
A biocidal composition comprising mollusc, brachiopod, and/or crustacean shell fragments with chitin and a biocidal metal, optionally with a degradable material, that releases biocidal metal into the environment in response to environmental cues, providing a consistent and controlled release over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic copper sheets or wires are used to prevent fouling organism growth, then biocidal metal release is achieved, but the release rate is inconsistent and unpredictable, and the metal forms an insoluble layer that blocks further release
Solution Approach 1:
The patent uses a composite material consisting of biocidal metal particles dispersed within a biodegradable polymer matrix. This composite structure allows controlled release of the metal while the polymer degrades over time, preventing the formation of blocking insoluble layers and maintaining consistent biocidal release throughout the service life of the product.
Solution Approach 2:
The patent changes the physical and chemical parameters of the metal release system by embedding metal particles within a polymer matrix that degrades at controlled rates. This transforms the release mechanism from direct metal corrosion to polymer-mediated controlled release, achieving consistent and predictable biocidal metal release over extended periods.
2Ease of operation
If manual cleaning with organic biocides is used, then fouling organisms are removed, but the method is harmful to users and the local environment
Solution Approach 1:
The patent replaces mechanical cleaning methods and organic chemical biocides with a passive, sustained-release biocidal system. The biodegradable polymer matrix slowly releases metal ions that continuously prevent fouling organism growth, eliminating the need for repeated manual interventions and harmful chemical applications.
Solution Approach 2:
The patent creates a self-service system where the biocidal product automatically maintains its function over time through controlled metal release. The system self-regulates by releasing biocidal metals at consistent rates as the polymer degrades, eliminating the need for human intervention while providing continuous protection without environmental harm.
3Reliability
If frequent manual removal of fouling organisms is performed, then structural damage and aesthetic degradation are prevented, but the cost and labor requirements increase
Solution Approach 1:
The patent applies preliminary action by incorporating biocidal metal release capability directly into the building material or coating during manufacturing. This preventive approach stops fouling organisms before they can establish and cause damage, eliminating the need for subsequent manual removal operations and associated time and cost losses.
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 composition effectively prevents the growth of fouling organisms by steadily releasing biocidal metals like copper, reducing damage and maintaining aesthetic appeal while being environmentally safe.
Implementation Method 1
the rate of release is conveniently responsive to environmental cues such as ultraviolet light, acidity, hydraulic erosion, and temperature fluctuations
Implementation Method 2
when a composition comprises shell fragments comprising chitin in addition to a source of biocidal metal such as copper, the rate of release of the biocidal metal into adjoining fluids and thus, the environment, is usefully regulated
Data Source
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AI summary
The present invention relates to a composition for reducing the growth of fouling organisms through release of biocidal metal therefrom into the environment, the composition comprising: mollusc, brachiopod, and/or crustacean shell fragments comprising chitin; a biocidal metal; and a degradable material, wherein the shell fragments and biocidal metal are admixed with, and dispersed throughout, the degradable material.