Fouling-Resistant Elastomer Coatings Using Acylated Lanolin
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Solution Overview
Problem
Existing anti-fouling coatings for aquatic structures, while environmentally benign, require high speeds for effective fouling release and have limited commercial success due to inadequate fouling resistance at lower speeds, and there is a need for non-toxic alternatives that provide superior fouling resistance and easy release of marine organisms.
Innovation Solution
A fouling-resistant coating composition comprising an elastomer, specifically organopolysiloxane polymers, combined with acylated lanolin or lanolin oil, which offers superior fouling resistance and effective release at lower speeds without releasing toxic materials into the aquatic environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If silicone rubber coatings are used for fouling resistance, then toxicity to aquatic life is reduced, but vessel speed must be increased to at least 14 knots for effective fouling release
Solution Approach 1:
The patent modifies the surface energy parameters of the silicone rubber coating by incorporating specific fluorinated compounds and silicones with controlled molecular weights and structures. This changes the physical-chemical parameters of the coating surface to achieve both low toxicity and effective fouling release at reduced speeds of 6-12 knots, resolving the contradiction between environmental benignity and operational effectiveness
Solution Approach 2:
The invention creates a composite coating system combining silicone rubber base polymers with fluorinated additives, crosslinking agents, and specific functional compounds. This composite material approach synergistically combines the biocompatibility of silicone rubber with the fouling-release enhancement of fluorinated compounds, achieving both low toxicity and effective performance at lower speeds
2Reliability
If anti-fouling coatings with toxic substances are used, then fouling resistance is improved, but environmental damage increases
Solution Approach 1:
The patent extracts and eliminates toxic biocidal substances from the coating formulation while retaining and enhancing the physical fouling-release mechanism. By removing toxic components and relying on controlled surface energy properties of silicone- fluorinated compounds, the coating maintains reliable fouling resistance without environmental damage
Solution Approach 2:
The invention replaces chemical toxic mechanisms with physical surface energy mechanisms. Instead of using toxic substances to kill or deter fouling organisms, the coating uses controlled surface energy properties to prevent adhesion, substituting a mechanical/physical approach for a chemical/toxic one
3Speed
If conventional fouling-resistant compositions are used, then fouling release is achieved, but adhesion strength of fouling organisms is insufficiently reduced
Solution Approach 1:
The patent precisely controls surface energy parameters by selecting specific fluorinated compounds with particular molecular structures and ratios. This parameter optimization creates a surface that not only enables fast fouling release at low speeds but also significantly reduces the initial adhesion strength of fouling organisms, addressing both aspects simultaneously
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 composition demonstrates enhanced fouling resistance and effective release of marine organisms at speeds as low as 0-12 knots, outperforming previous compositions, with acylated lanolin or lanolin oil providing superior performance against a wide range of fouling types, including slime, weed, and hard fouling, while being environmentally friendly.
Implementation Method 1
WO 02/074870 describes an alternative fouling-resistant composition which has low surface energy and suitable elastomeric properties
Data Source
Figure 1
AI summary
The present invention provides a fouling-resistant composition which comprises an elastomer and a component comprising sterol(s) and/or sterol derivative(s), wherein the component is selected from acylated lanolin, alkoxylated lanolin, or lanolin oil, or a composition comprising at least 20 weight % of one or more sterol(s), at least 20 weight % of one or more C1-C12 sterol ester(s), or at least 20 weight % of alkoxylated sterol(s), wherein weight % is the percentage of the sterol or sterol derivative to the total weight of the component.