Catalyst-Modified Barrier Primer for Strippable Coatings
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Solution Overview
Problem
Existing systems with good intercoat adhesion and chemical resistance are difficult or impossible to strip using mild paint removers, and previous attempts to balance rain erosion and strippability have been unsuccessful.
Innovation Solution
Incorporating a catalyst, such as manganese dioxide, into the barrier primer coat to facilitate the decomposition of hydrogen peroxide, which helps lift and remove subsequent coatings without damaging the primer, using a hydrogen peroxide-based stripper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating system with good intercoat adhesion and chemical resistance is used, then the coating performance is improved, but the strippability of subsequent coatings deteriorates
Solution Approach 1:
A catalyst (such as manganese dioxide) is incorporated into the barrier primer coat during the coating application process. This catalyst remains dormant during normal service but activates when exposed to hydrogen peroxide stripper, preliminarily preparing the primer for controlled decomposition andstripping of overcoats while maintaining its protective function during service
Solution Approach 2:
Hydrogen peroxide serves as an intermediary substance that triggers the catalytic decomposition of the primer coat containing the catalyst. The peroxide penetrates the coating system, reacts with the catalyst in the primer, and generates oxygen bubbles that mechanically lift and remove the overcoats without damaging the substrate
2Object-affected harmful factors
If mild paint removers are used for stripping, then the substrate is protected from damage, but the ability to strip coatings with strong adherence fails
Solution Approach 1:
The chemical properties of the stripper are changed from mild (emulsions of benzyl alcohol in water) to aggressive (hydrogen peroxide with catalyst decomposition). The hydrogen peroxide, when activated by the catalyst, generates oxygen bubbles and heat that dramatically increase stripping power while the barrier primer protects the substrate from direct contact with the aggressive stripper
3Ease of operation
If a barrier primer containing catalyst is used to improve strippability, then the removal of overcoats is facilitated, but the risk of primer damage by peroxide increases
Solution Approach 1:
The catalyst is distributed throughout the barrier primer coat, creating localized decomposition sites. The decomposition reaction occurs primarily at the interface between the primer and overcoats where the peroxide penetrates, generating oxygen bubbles that lift the overcoats. The barrier primer's chemical resistance properties protect the bulk of the primer from excessive damage while allowing controlled decomposition at the reaction front
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 method effectively strips multiple layers of coatings with strong adherence while maintaining the integrity of the barrier primer, achieving excellent intercoat adhesion and chemical resistance, and can be done within a reasonable time frame using commercially available strippers.
Implementation Method 1
contacting the top coat of a surface covered with the primer and one or more additional coats with a stripping agent comprising hydrogen peroxide at decomposition reaction conditions
Implementation Method 2
a catalyst for the decomposition of hydrogen peroxide
Data Source
AI summary
The invention is a method of stripping one or more additional coats covering a barrier primer coat that covers a surface. The barrier coat contains a catalyst, such as manganese dioxide and, or, manganese carbonate, for the decomposition of hydrogen peroxide. The top coat of the covered surface is contacted with the stripping agent at decomposition reaction conditions.