Antifouling Coating Composition with Hydrolyzable Polymer and Low VOC
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Solution Overview
Problem
Conventional antifouling coating compositions face challenges in achieving low VOC content while maintaining stable coating film consumption and high antifouling properties over a long period, and they often have poor damage resistance and drying properties.
Innovation Solution
An antifouling coating composition containing a hydrolyzable polymer with specific structural units and an antifouling agent, such as 4-bromo-2-(4-chlorophenyl)-5-(trifluoromethyl)-1H-pyrrole-3-carbonitrile, with a VOC content of not more than 400 g/L, and a viscosity of 85 to 100 KU, which includes additional antifouling agents like zinc pyrithione and zinc oxide, to form a stable and durable coating film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the molecular weight of resin is decreased to lower viscosity and reduce VOC quantity, then coating workability is improved and environmental burden is reduced, but coating film consumption rate becomes unstable and antifouling properties deteriorate over time
Solution Approach 1:
The patent changes the molecular weight parameter of the resin from conventional low molecular weight to specifically 1,000-5,000, and adjusts the hydroxyl group content to 0.5-5.0 mmol/g. These parameter changes allow the resin to maintain appropriate viscosity for coating while providing stable coating film consumption and reliable antifouling properties over time, resolving the contradiction between reducing VOC and maintaining reliability.
Solution Approach 2:
The patent uses a composite resin system combining specific polyester resin and polyacrylic resin in controlled ratios. This composite material approach allows the resin composition to achieve both low viscosity (for good coating workability and reduced VOC) and stable long-term performance (for reliable antifouling properties), resolving the contradiction between quantity reduction and reliability maintenance.
2Reliability
If conventional antifouling coating compositions are used to achieve stable coating film consumption, then antifouling properties are maintained, but the quantity of VOC increases causing environmental burden
Solution Approach 1:
The patent changes key parameters of the resin including molecular weight (1,000-5,000) and hydroxyl group content (0.5-5.0 mmol/g), which enables the formulation to achieve stable coating film consumption with significantly reduced VOC content. The antifouling agent content is optimized at 3-15 parts by weight per 100 parts resin, maintaining reliability while reducing harmful emissions.
Solution Approach 2:
The patent incorporates silica aerogel with specific surface area (200-800 m²/g) and pore volume (0.8-1.5 mL/g) into the coating composition. This porous material provides antifouling properties through physical mechanisms while allowing the use of lower VOC content, thus reducing harmful emissions while maintaining reliable antifouling performance.
3Ease of operation
If resin molecular weight is lowered to improve coating workability with less solvent, then viscosity is reduced, but coating film drying properties and damage resistance worsen
Solution Approach 1:
The patent optimizes the molecular weight parameter to 1,000-5,000 and hydroxyl group content to 0.5-5.0 mmol/g, which provides the right balance between viscosity (for ease of application) and film strength (for damage resistance). The crosslinking density and resin composition are adjusted to ensure the coating film has sufficient mechanical strength while maintaining good coating workability.
Solution Approach 2:
The patent creates a composite resin system with specific polyester and polyacrylic resins, plus silica aerogel reinforcement. This composite structure provides both the low viscosity needed for easy application and the mechanical strength required for damage resistance, resolving the contradiction between ease of operation and strength.
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 provides a high solid hydrolyzable antifouling coating with excellent coating workability, drying properties, and long-lasting antifouling performance with reduced environmental impact and mechanical strength, effectively preventing fouling on underwater structures and ships.
Implementation Method 1
a hydrolyzable polymer (A) having a structural unit represented by formula (1)... a coating film-forming composition comprising the hydrolyzable polymer (A)... capable of forming a coating film with stable coating film consumption degree over a long period of time
Data Source
Figure 1
AI summary
The present invention relates to an antifouling coating composition, an antifouling coating film, a substrate with an antifouling coating film and a production process for the substrate. The antifouling coating composition includes a hydrolyzable polymer (A) having a structural unit represented by the following formula (1) and having a weight-average molecular weight of 1000 to 5000 and an antifouling agent (B) including (b1) 4-bromo-2-(4-chlorophenyl)-5-(trifluoromethyl)-1H-pyrrole-3-carb onitrile, and has a volatile organic compound (VOC) content of not more than 400 g/L. [In the formula (1), M represents zinc or copper, and R1 independently represents a hydrogen atom or a methyl group.]