RMA Coating System Primer for Wood Adhesion
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Solution Overview
Problem
RMA crosslinkable compositions often exhibit poor adhesion properties, particularly on wood surfaces, and are not well-suited for colorless and transparent coatings, necessitating improved coating systems for acidic substrates that provide good adhesion, mechanical properties, and low-temperature curing.
Innovation Solution
A coating system comprising a binder component with a specific polymer as a primer, combined with an RMA crosslinkable composition, which includes components A and B with reactive groups for Michael Addition reaction, and a catalyst, optimized for acidic substrates like wood, using a non-aqueous composition with a solvent and optional reactivity moderator to enhance adhesion and curing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If RMA crosslinkable compositions are applied directly on wood surfaces, then the coating can be applied with simple process, but the adhesion is poor
Solution Approach 1:
The patent applies a binder component P as a primer layer before applying the RMA crosslinkable composition. This preliminary action prepares the wood surface by creating a suitable intermediate layer that enhances adhesion, allowing the subsequent RMA coating to bond effectively to the substrate.
Solution Approach 2:
The patent creates a composite coating system consisting of two distinct components: a binder component P (which may be polymer-based) and an RMA crosslinkable composition. This composite approach combines the adhesion benefits of the binder with the crosslinked protective properties of the RMA coating, achieving both good adhesion and coating performance.
2Reliability
If epoxy primer coating composition is used to improve adhesion on metal substrates, then adhesion is improved, but the coating is not suitable for colorless and transparent applications
Solution Approach 1:
The patent modifies the binder component P to have specific parameter ranges: number-average molecular weight of 6,000 to 60,000 g/mol, weight-average molecular weight of 20,000 to 300,000 g/mol, glass transition temperature of 30 to 180 °C, and acid value of at most 3.0 mg KOH/g. These parameter optimizations allow the binder to provide adhesion while maintaining transparency for colorless coating applications.
3Ease of manufacture
If conventional coating systems are used on acidic substrates, then the coating can be applied, but the adhesion and curing performance are insufficient
Solution Approach 1:
The patent optimizes the binder component P with specific molecular weight parameters (Mn: 6,000-60,000 g/mol, Mw: 20,000-300,000 g/mol), glass transition temperature (30-180 °C), and acid value (≤3.0 mg KOH/g). These parameter changes enable the binder to effectively interact with acidic substrates while providing adequate adhesion and supporting low-temperature curing.
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 system achieves excellent adhesion, mechanical, and chemical properties, including hardness and durability, with the ability to cure at relatively low temperatures, specifically improving the performance on wood substrates and acidic surfaces.
Implementation Method 1
a substituted carbonate catalyst which decomposes in a coating layer to generate carbon dioxide which evaporates from the applied curing coating layer and a strong base which starts the RMA crosslinking reaction
Implementation Method 2
carbon dioxide which evaporates from the applied curing coating layer
Implementation Method 3
the at least 2 reactive groups react to achieve crosslinking by Real Michael Addition (RMA) reaction between said at least one RMA crosslinkable components in the presence of a base catalyst (C)
Data Source
AI summary
The invention relates to a coating system comprising a binder composition comprising a polymer having a Mn of 6,000 to 60,000 g/mol, a Mw of 20,000 to 300,000 g/mol, a Tg of 30 to 180 °C and an acid value of at most 3.0mg KOH/g, and a RMA crosslinkable coating composition comprising a component A with at least two acidic protons C-H in activated methylene or methine groups, a component B with at least two activated unsaturated C=C groups and a base crosslinking catalyst C; and its use for improving adhesion of the RMA crosslinkable coating composition, in particular to wood substrates.