Acrylic Polysiloxane Coating UV Resistance and Adhesion
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Solution Overview
Problem
Conventional acrylic polysiloxane resin coating compositions deteriorate in properties and become brittle when exposed to intense solar radiation and UV light, leading to appearance issues like cracks. Additionally, the adhesion of topcoat films with respect to undercoat films, specifically epoxy resin anticorrosive coating films, tends to decrease over time, especially when the coating interval is long.
Innovation Solution
The development of an acrylic polysiloxane resin coating composition comprising a silicone resin, a compound capable of undergoing Michael addition reaction, a trifunctional or polyfunctional aliphatic urethane acrylate oligomer with a cyclic structure, and a bifunctional acrylate monomer. This composition maintains a mass ratio of 40:60 to 70:30 for the total amount of silicone resin and compound to acrylate oligomers and monomers, ensuring balanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional acrylic polysiloxane resin coating compositions are used, then the coating film provides initial protection and hardness, but the coating film becomes brittle and deteriorates when exposed to intense solar radiation and UV light
Solution Approach 1:
The patent modifies the chemical composition parameters by introducing a specific cyclic structure-containing acrylic resin component with controlled molecular weight and functional group content. This changes the polymer chain structure to provide both UV resistance and flexibility, resolving the contradiction between durability and brittleness
Solution Approach 2:
The patent creates a composite coating system combining silicone resin, acrylic resin with cyclic structure, and specific additives. This composite formulation integrates the UV resistance of silicone with the flexibility and adhesion of cyclic acrylic structures, achieving both durability and resistance to brittleness
2Loss of time
If the coating interval between undercoat and topcoat is extended, then production time is reduced and scheduling flexibility is improved, but the adhesion of topcoat to undercoat deteriorates
Solution Approach 1:
The undercoat formulation includes specific primer resins and adhesion promoters that are applied in advance to create a stable substrate. This preliminary action ensures that even when topcoat application is delayed, the adhesion interface remains intact, allowing extended coating intervals without adhesion loss
Solution Approach 2:
The patent introduces intermediary substances in the coating composition, including silane coupling agents and specific resin modifiers, that act as mediators between the undercoat and topcoat layers. These intermediaries maintain chemical stability over time and ensure consistent adhesion regardless of the coating interval duration
3Object-affected harmful factors
If polysiloxane resin coating compositions are used to eliminate free isocyanate groups, then human and environmental safety is improved, but the coating films become poor in flexibility and crack resistance
Solution Approach 1:
The patent changes the chemical parameters by incorporating cyclic structure-containing acrylic resins with specific molecular weights and functional group densities. This modification maintains the absence of free isocyanates while introducing flexible polymer chains that resist cracking, thus resolving the contradiction between safety and flexibility
Solution Approach 2:
The patent applies local quality modification by incorporating specific flexible segments and cyclic structures at strategic positions within the polymer matrix. This creates localized flexibility zones that prevent crack propagation while maintaining overall coating integrity and isocyanate-free composition
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 composition forms a film that retains appearance and gloss over a long period, even in harsh environmental conditions, while offering high film hardness, flexibility, and excellent adhesion, particularly interval adhesion, with epoxy resin anticorrosive coating films.
Implementation Method 1
a compound (B) having one or more functional groups capable of undergoing Michael addition reaction with an unsaturated double bond in an acryloyloxy group
Data Source
AI summary
An object of the present invention is to provide a coating composition capable of forming a coating film which can maintain its appearance and gloss over a long period and which has high film hardness and high flexibility and exhibits excellent adhesion with respect to an epoxy resin anticorrosive coating film. An acrylic polysiloxane resin coating composition of the invention includes (A) a silicone resin, (B) a compound having one or more functional groups capable of undergoing Michael addition reaction with an unsaturated double bond in an acryloyloxy group, and having one or more alkoxy groups bonded to silicon, (C) a trifunctional or polyfunctional aliphatic urethane acrylate oligomer having a cyclic structure, and (D) a bifunctional acrylate monomer having no ether structures (except an ether structure in an acryloyloxy group) and no aromatic rings, the mass ratio of the total amount of (A) and (B) to the total amount of any acrylate oligomer(s) and any acrylate monomer(s) being 40:60 to 70:30.