Epoxy Coating Adhesion via Polyvinyl Alkyl Ether Copolymer
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Solution Overview
Problem
Epoxy resin coating compositions used for iron and steel structures face issues with adhesion deterioration due to solvent swelling and contraction stress during top coating application, leading to corrosion, especially when hydrolyzable antifouling or crosslinking reaction type coatings are applied, resulting in poor interlayer adhesion and increased solvent usage.
Innovation Solution
Incorporating a polyvinyl alkyl ether (co)polymer and an amine curing agent in the epoxy resin coating composition, with the polyvinyl alkyl ether (co)polymer comprising at least 50% of the monomer weight and present in amounts of 0.1 to 10% by weight, along with a reactive diluent having an epoxy group, to enhance adhesion and overcoatability while reducing solvent requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an epoxy resin coating composition is used for corrosion prevention, then excellent anticorrosive properties are achieved, but interlayer adhesion deteriorates when top coating is applied after a long period
Solution Approach 1:
The patent modifies the chemical composition parameters of the epoxy resin coating by incorporating specific polyols (glycerol, pentaerythritol, dipentaerythritol) in controlled amounts (0.1-10 wt% based on epoxy resin weight). This parameter change alters the crosslinking density and network structure of the cured coating, improving interlayer adhesion while preserving anticorrosive properties. The modified composition allows top coating application even after extended periods without adhesion deterioration.
2Reliability
If a hydrolyzable antifouling coating composition is applied as top coating, then antifouling properties are achieved, but interlayer adhesion significantly deteriorates
Solution Approach 1:
The patent creates a composite coating system where the primer layer uses modified epoxy resin containing specific polyols, and the top layer uses hydrolyzable antifouling coating composition. The modified epoxy primer provides a compatible interface that prevents adhesion deterioration when the hydrolyzable top coating is applied. This composite structure allows both antifouling properties and interlayer adhesion to be maintained.
3Strength
If the reaction ratio between epoxy resin and curing agent is reduced to improve overcoatability, then interlayer adhesion improves, but corrosion resistance may be compromised
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating polyols (glycerol, pentaerythritol, dipentaerythritol) into the epoxy resin system. This allows the use of lower epoxy resin to curing agent ratios (improved overcoatability) while the polyols compensate for reduced crosslinking density, maintaining corrosion resistance. The polyols create a more flexible and adhesive coating network that supports top coating application.
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 forms a coating film with excellent anticorrosive properties and adhesion to the substrate, maintaining interlayer adhesion with top coatings and reducing solvent usage, thereby preventing adhesion deterioration and corrosion, even under crosslinking reaction type top coatings.
Implementation Method 1
an anticorrosive coating composition comprising an epoxy resin (a), a polyvinyl alkyl ether (co)polymer (b), and an amine curing agent (c)
Implementation Method 2
an epoxy resin (a), a polyvinyl alkyl ether (co)polymer (b), and an amine curing agent (c)
Data Source
Figure 1
AI summary
The present invention relates to an anticorrosive coating composition, an anticorrosive coating film, a substrate with an anticorrosive coating film, and a method of producing a substrate with an anticorrosive coating film. The anticorrosive coating composition includes an epoxy resin (a), a polyvinyl alkyl ether (co)polymer (b), and an amine curing agent (c).