Sheet-Peelable Antifouling Coating With Tackifying Undercoat
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Solution Overview
Problem
Conventional antifouling coatings require labor-intensive removal due to deteriorated adhesive force over time, especially in underwater structures like ships, and do not facilitate sheet peeling.
Innovation Solution
An undercoat layer-forming composition containing a tackifying resin is used to enhance adhesiveness and prevent silicone oil migration, allowing the coating film to be peeled in a sheet form, comprising a base polymer and tackifying resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antifouling paint is applied to underwater structures, then antifouling performance is achieved, but adhesive force deteriorates over time requiring labor-intensive removal
Solution Approach 1:
The coating system is divided into two separate layers: an undercoat layer providing strong adhesion to the substrate, and an antifouling layer containing the antifouling agent. This segmentation allows each layer to specialize in its function, with the undercoat maintaining stable adhesive force and the antifouling layer providing protection, thereby resolving the contradiction between maintaining antifouling performance and enabling easy removal.
Solution Approach 2:
The invention enables the antifouling layer to be easily removed and replaced while the undercoat layer remains on the substrate. This allows the antifouling layer to be discarded after its service life and a new one applied, recovering the valuable undercoat layer and avoiding the need to remove the entire coating system, thus reducing labor-intensive removal work.
2Duration of action of stationary object
If coating film is used for long period on moving underwater structures, then antifouling protection is maintained, but adhesive force deteriorates causing peeling
Solution Approach 1:
By segmenting the coating into undercoat and antifouling layers, the undercoat layer can be designed with optimized adhesive components that maintain strong bonding to the substrate over long periods, while the antifouling layer provides the protective function. This segmentation allows independent optimization of adhesion and antifouling properties.
Solution Approach 2:
The undercoat layer uses composite material composition including specific resins and adhesion promoters that provide exceptional long-term adhesive strength in underwater environments. This composite formulation ensures the undercoat maintains reliable bonding even after prolonged exposure to water and mechanical stress from moving structures.
3Ease of manufacture
If grinding method is used to remove coating film, then complete removal is achieved, but heavy labor and high cost are required
Solution Approach 1:
The invention replaces the mechanical grinding system with a chemical separation system. The antifouling layer is designed to be removable through chemical means or manual peeling, substituting the high-energy mechanical grinding process with a lower-energy removal method that achieves complete removal without heavy labor or high costs.
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 film maintains strong adhesion to the substrate and facilitates easy removal, reducing labor and cost associated with peeling, even in underwater environments.
Implementation Method 1
the tackifying resin contained in the undercoat layer prevents migration of a silicone oil contained in the antifouling layer to the undercoat layer with the passage of time, whereby the adhesiveness to an adherend is developed
Implementation Method 2
an undercoat layer-forming composition for forming an undercoat layer of a coating film including the undercoat layer and an antifouling layer which contains a silicone oil and is adhered to the undercoat layer
Data Source
AI summary
An object of the present invention is to provide a coating film that can be peeled in a sheet form, facilitates removal work and is less likely to be peeled even if used in an underwater structure for a long period of time, and an undercoat layer-forming composition for forming an undercoat layer of the coating film. The present invention relates to an undercoat layer-forming composition for forming an undercoat layer of a coating film including the undercoat layer and an antifouling layer which contains a silicone oil and is adhered to the undercoat layer, wherein the undercoat layer-forming composition contains a base polymer and a tackifying resin.