Biodegradable PHA Binder for Antifouling Coatings
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Solution Overview
Problem
Existing antifouling coating products for underwater surfaces face challenges with the duration of their protective effect, as they either release biocides too quickly or have limited abrasion resistance, and there is a need for a biodegradable binder that does not require unsaturated side groups for dissolution in organic solvents.
Innovation Solution
A composition comprising polyhydroxyalkanoates (PHA) with saturated side chains, dissolved in aromatic organic solvents at specific concentrations, is developed, allowing for complete dissolution by heating or fractional distillation, enabling their use as binders for coating products without the need for unsaturated side groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polyhydroxyalkanoates with unsaturated side groups are used to enable dissolution in organic solvents, then the binder can be formulated for coating products, but the polymer requires complex chemical structure modifications and may compromise biodegradability
Solution Approach 1:
The patent changes the chemical parameter of the polymer by using saturated side chains instead of unsaturated ones, and adjusts the dissolution parameter by selecting specific aromatic solvents and controlling concentration (50-200 g/l) and temperature, thereby achieving formulability without structural modification
Solution Approach 2:
The patent uses simple, readily available aromatic solvents (toluene, xylene, ethylbenzene) instead of complex specialized solvents, and accepts that the binder will be applied and dried, leaving only the polymer film, thus simplifying the overall system
2Reliability
If biocides are released quickly from antifouling coatings, then the initial protective effect is strong, but the duration of protection is reduced
Solution Approach 1:
The patent implements periodic release of biocides from the coating, where the binder gradually releases biocidal agents over time, providing sustained protection rather than a single strong initial effect, thereby extending the duration of antifouling action
Solution Approach 2:
The patent creates a dynamic system where the binder progressively releases biocides as the coating is exposed to water, with the release rate adjusting based on environmental conditions, allowing the coating to adapt its protective action over time
3Reliability
If conventional binders are used to achieve good adhesion and durability, then coating performance is improved, but environmental impact increases due to non-biodegradability
Solution Approach 1:
The patent creates a composite binder system combining biodegradable polyhydroxyalkanoate polymer with biocidal agents and aromatic solvents, achieving both protective performance and environmental compatibility through the synergistic combination of biodegradable polymer matrix and functional additives
Solution Approach 2:
The patent converts the typically harmful persistent nature of conventional polymer binders into a benefit by selecting biodegradable PHA polymers that naturally break down, turning the potential harm of long-lasting polymers into the benefit of environmental friendliness while maintaining coating performance through proper formulation
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 PHA-based binder provides stable, high-concentration solutions suitable for coating products, offering improved adhesion and biodegradability, with extended durability and reduced environmental impact.
Implementation Method 1
A composition comprising polyhydroxyalkanoates (PHA) with saturated side chains, dissolved in aromatic organic solvents at specific concentrations, is developed, allowing for complete dissolution by heating
Implementation Method 2
complete dissolution by heating or fractional distillation
Data Source
AI summary
Composition comprising at least one polyhydroxyalkanoate (PHA) having saturated side chains dissolved in at least one aromatic solvent in an amount of between 50 g/l and 200 g/l, preferably between 80 g/l and 180 g/l, said at least one PHA having a weight- average molecular weight (Mw) not greater than 250,000 Da, preferably not greater than 150,000 Da. This composition is particularly suitable for use as a binder for coating products. The composition can be produced by mixing the PHA with the aromatic organic solvent and heating the mixture at a temperature close to the melting temperature of the PHA, maintaining the mixture under stirring until complete dissolution of the polymer. Alternatively, the composition can be produced by dissolution of the PHA in a non-aromatic organic solvent having low boiling temperature (lower than 80°C) in which the PHA is highly soluble, subsequent addition of the aromatic organic solvent and subsequent removal of the non-aromatic organic solvent by fractional distillation.