Silicone-Modified Urethane Acrylate for Decorative Film Coating
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Solution Overview
Problem
Existing ionizing radiation curable paint compositions for decorative films lack versatility in curing, often result in uneven curing due to shape constraints, have short pot life leading to physical property unevenness, and insufficient chemical resistance, especially when used with resin materials like PMMA and PC that have low solvent resistance.
Innovation Solution
A paint composition incorporating a silicone-modified urethane (meth)acrylate oligomer with specific constituent units, including a carbinol-modified polysiloxane, isophorone diisocyanate, and a multifunctional (meth)acrylate monomer, which allows for excellent elongation, solvent resistance, and chemical resistance, and can include an inorganic filler for enhanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional ionizing radiation curable paint composition is used, then the cured film has good chemical resistance, but the elongation under heating is insufficient and the film lacks flexibility for shaping
Solution Approach 1:
The patent uses a composite resin composition containing both ionizing radiation curable components (urethane acrylate oligomer with isocyanate groups) and thermoplastic components (polyester or polyamide resin). This composite structure allows the film to achieve both chemical resistance from the cured crosslinked network and elongation under heating from the thermoplastic phase, resolving the contradiction between chemical resistance and shapeability.
Solution Approach 2:
The patent adjusts the molecular weight and functional group content of the urethane acrylate oligomer to control the balance between crosslinking density (for chemical resistance) and chain flexibility (for elongation). By optimizing these parameters, the cured film achieves both durability and shapeability.
2Reliability
If the resin composition is cured completely before shaping, then the chemical resistance is improved, but the elongation under heating is reduced and the film becomes difficult to shape
Solution Approach 1:
The patent divides the curing process into two stages: partial curing during coating application (forming a skin layer with good chemical resistance) and complete curing after shaping (achieving full crosslinking density). This segmentation allows the film to be shaped in the partially cured state while maintaining chemical resistance in the final cured state.
Solution Approach 2:
The patent exploits the dynamic properties of the resin system, where the thermoplastic component provides flexibility for shaping in the early stage, and the ionizing radiation curable component provides chemical resistance in the final stage. The system transitions from a flexible, shapable state to a chemically resistant, crosslinked state.
3Adaptability or versatility
If a thermoplastic resin is blended in the paint composition, then the elongation under heating is improved, but the chemical resistance and curing uniformity are compromised
Solution Approach 1:
The patent uses the isocyanate groups in the urethane acrylate oligomer as an intermediary that reacts with hydroxyl groups in the thermoplastic resin to form urethane linkages. This intermediary reaction creates strong interfacial bonding between the crosslinked and thermoplastic phases, ensuring both chemical resistance and elongation properties are achieved simultaneously.
4Adaptability or versatility
If the paint composition is applied to complex shaped articles, then the versatility is improved, but curing failure occurs in hard-to-reach areas
Solution Approach 1:
The patent replaces conventional thermal curing methods with ionizing radiation curing. This substitution eliminates the limitations of heat penetration and allows uniform curing throughout complex geometries, including hard-to-reach areas, by using radiation that can penetrate and cure the coating uniformly regardless of shape complexity.
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 paint composition achieves a cured film with 30% or more elongation under heating, excellent solvent resistance, and chemical resistance, enabling the use of alcohol as a diluent solvent and improving the durability and flexibility of decorative films and shaped articles.
Implementation Method 1
an ionizing radiation curable paint composition, containing a urethane (meth)acrylate oligomer (A1)
Data Source
AI summary
The present invention provides an ionizing radiation curable paint composition which is capable of forming a cured film that has excellent elongation (for example, 30% or more) under heating and has excellent solvent resistance and chemical resistance and which can contain an alcohol as a diluent solvent. The ionizing radiation curable paint composition contains a urethane (meth)acrylate oligomer (A1) having 6 or more (meth)acryloyl groups and having a weight average molecular weight of 3,000 to 50,000, wherein the urethane (meth)acrylate oligomer (A1) is a silicone-modified oligomer having a constituent unit (a) derived from a multifunctional (meth)acrylate monomer having a hydroxy group and 3 or more (meth)acryloyl groups, a constituent unit (b) derived from an alcohol having 2 or more hydroxy groups and having a molecular weight of 100 or lower, a constituent unit (c) derived from isophorone diisocyanate, and a constituent unit (d) derived from a carbinol-modified polysiloxane.