Silylacrylic Copolymer Antifouling Coating Storage Stability
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Solution Overview
Problem
Conventional antifouling coating compositions containing triisopropylsilyl(meth)acrylate polymers face trade-offs between storage stability, antifouling properties, and water resistance, with homopolymers of TIPSA exhibiting early hydrolysis and cracking, and homopolymers of TIPSMA having poor renewability and insufficient static antifouling properties.
Innovation Solution
A silylacrylic copolymer comprising structural units from triisopropylsilyl methacrylate, triisopropylsilyl acrylate, and a polymerizable monomer, with specific weight ratios, combined with rosin and/or monocarboxylic acid compounds, copper compounds, and other additives, to form a coating film with improved long-term storage stability, antifouling properties, and water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a homopolymer of triisopropylsilyl acrylate (TIPSA) is used as the hydrolyzable resin component, then the coating film consumption property (renewability) is improved, but the storage stability deteriorates due to early hydrolysis reaction and cracking
Solution Approach 1:
The patent uses a copolymer containing both triisopropylsilyl acrylate (TIPSA) and triisopropylsilyl methacrylate (TIPSMA) units. This composite polymer structure combines the advantages of both monomers: TIPSA provides good coating film consumption property and renewability, while TIPSMA contributes to storage stability and resistance to early hydrolysis. The synergistic effect of the copolymer resolves the contradiction between renewability and storage stability.
Solution Approach 2:
The patent specifies precise compositional parameters for the copolymer: the content ratio of TIPSA to TIPSMA structural units is controlled within specific ranges (TIPSA: 30-70 wt%, TIPSMA: 30-70 wt%). By optimizing these compositional parameters, the patent achieves the desired balance between coating film consumption property and storage stability, preventing both early hydrolysis and ensuring adequate renewability.
2Reliability
If a homopolymer of triisopropylsilyl methacrylate (TIPSMA) is used as the hydrolyzable resin component, then the storage stability is improved, but the coating film consumption property (renewability) deteriorates
Solution Approach 1:
The patent employs a copolymer combining TIPSMA and TIPSA units. The TIPSMA units provide storage stability and resistance to hydrolysis, while the TIPSA units ensure adequate coating film consumption property and renewability. This composite structure allows the coating to maintain both stability during storage and effectiveness during service.
Solution Approach 2:
The patent controls the compositional parameters of the copolymer, specifically maintaining TIPSA content at 30-70 wt% and TIPSMA content at 30-70 wt%. This parameter optimization ensures that the coating has sufficient stability from TIPSMA while retaining adequate renewability from TIPSA, resolving the contradiction between storage stability and consumption property.
3Reliability
If the content of triisopropylsilyl methacrylate (TIPSMA) is increased to improve water resistance, then the hydrolysis resistance is improved, but the coating film consumption property (renewability) deteriorates
Solution Approach 1:
The patent creates a copolymer composite where TIPSMA units (30-70 wt%) provide water resistance and hydrolysis resistance, while TIPSA units (30-70 wt%) maintain coating film consumption property and renewability. The balanced composition ensures that water resistance is improved without sacrificing the ability of the coating to be consumed and renewed.
4Productivity
If the content of triisopropylsilyl acrylate (TIPSA) is increased to improve coating film consumption property, then the renewability is improved, but the storage stability deteriorates due to increased hydrolysis reaction
Solution Approach 1:
The patent uses a copolymer composite where TIPSA units (30-70 wt%) provide coating film consumption property and renewability, while TIPSMA units (30-70 wt%) provide storage stability and resistance to hydrolysis. The synergistic combination resolves the contradiction between renewability and storage stability.
Solution Approach 2:
The patent optimizes the compositional parameters by controlling TIPSA content at 30-70 wt% and TIPSMA content at 30-70 wt%. This parameter control ensures that the coating has sufficient renewability from TIPSA while maintaining storage stability through TIPSMA, preventing early hydrolysis reactions.
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 antifouling coating composition achieves excellent long-term storage stability, antifouling properties, and water resistance, balancing coating film hydrolyzability, static antifouling performance, and mechanical properties, preventing aquatic creature adherence on substrates for extended periods.
Implementation Method 1
allows hydrolysis reaction within the coating film to take place relatively early
Implementation Method 2
carboxyl groups are bonded to one another via a divalent metal ion such as a copper ion and a zinc ion derived from cuprous oxide and zinc oxide, respectively, and are three-dimensionally crosslinked
Data Source
AI summary
The antifouling coating composition according to the present invention includes a silylacrylic copolymer including a structural unit (1) derived from triisopropylsilyl methacrylate (i), a structural unit (2) derived from triisopropylsilyl acrylate (ii) and a structural unit (3) derived from a polymerizable monomer having a polymerizable double bond (iii), which excludes the above (i) and (ii), the silylacrylic copolymer satisfies specific requirements. Thus, an antifouling coating composition that is excellent in long-term storage stability and gives a coating film excellent in long-term antifouling properties and long-term water resistance can be provided.