Polysiloxane Curable Composition for Organotin-Free Antifouling Coatings
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Solution Overview
Problem
Existing anti-fouling coatings face challenges due to marine pollution concerns and neurotoxic properties of organotin compounds, necessitating a binder system that prevents biofouling without these drawbacks.
Innovation Solution
A hardenable composition comprising polysiloxane, silyl group-bearing polyether, and isocyanate-containing compounds, with specific molecular structures and ratios, forms a coating with amphiphilic properties to counteract bio-growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organotin compounds are used in anti-fouling coatings, then biofouling prevention is achieved, but marine pollution and neurotoxicity problems occur
Solution Approach 1:
The patent removes the harmful organotin compounds from the coating formulation entirely, replacing them with a binder system based on polysiloxanes and silyl group-bearing polyethers that provides anti-fouling protection through amphiphilic surface properties rather than toxic biocides
Solution Approach 2:
The invention changes the fundamental mechanism of anti-fouling action from chemical toxicity to physical surface properties by controlling the amphiphilic balance (hydrophilic-lipophilic ratio) of the polymer coating, thereby eliminating neurotoxicity while maintaining biofouling prevention
2Ease of operation
If degradable polymer coatings are used for self-polishing, then surface renewal and dirt removal are achieved, but coating durability may be reduced
Solution Approach 1:
The patent creates local quality differentiation within the coating by forming an amphiphilic surface layer with specific hydrophilic-lipophilic balance that provides self-polishing properties, while the bulk coating maintains durability through crosslinked polysiloxane and polyether structures
Solution Approach 2:
The invention uses controlled degradation at the surface level (partial action) where the amphiphilic polymer matrix gradually renews itself, while the overall coating structure maintains integrity and durability through its crosslinked network
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 biofouling by forming a coating with amphiphilic properties, reducing adhesion of microorganisms and algae, and avoids the use of neurotoxic organotin compounds.
Implementation Method 1
reaction products of a silyl group-bearing polyether with one or more isocyanate-containing compounds
Implementation Method 2
a hardenable composition containing as Component A at least one polysiloxane, component B at least one silyl group-bearing polyether
Implementation Method 3
forms a coating film that dissolves slowly in seawater
Implementation Method 4
combining hydrophilic and hydrophobic components, could produce a coating that has a surface with amphiphilic properties
Data Source
AI summary
The invention relates to a curable composition comprising as - component A at least one polysiloxane, - component B at least one silyl group-bearing polyether and/or reaction products of a silyl group-bearing polyether with one or more isocyanate-containing compounds and - component C at least one catalyst.