Decorative Sheet Surface Protective Layer UV Bleed-Out
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Solution Overview
Problem
Decorative sheets using benzophenone-based and benzotriazole-based UV absorbents face issues with bleed-out and short-term weather resistance, especially in severe environments, and the use of triazine-based UV absorbents with acrylic resin compositions can harden the surface protective layer, affecting workability.
Innovation Solution
A decorative sheet with a surface protective layer containing hydroxyphenyltriazine compounds as UV absorbents, where the total UV absorbent content is 10 parts by mass or less relative to 100 parts of resin, and a specific ratio of hydroxyphenyltriazine compounds is used to prevent bleed-out and maintain long-term weather resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If benzophenone-based or benzotriazole-based UV absorbents are added to improve weather resistance, then weather resistance is improved, but the UV absorbent readily bleeds out and deteriorates with time
Solution Approach 1:
The patent changes the chemical parameter of the UV absorbent from benzophenone-based or benzotriazole-based compounds to triazine-based compounds (specifically 2-(2-hydroxyphenyl)benzotriazole and 2-(2-hydroxyphenyl)triazine). This chemical substitution resolves the contradiction by providing a UV absorbent that maintains weather resistance while preventing bleed-out and deterioration over time, as evidenced by the stable performance in outdoor exposure tests.
Solution Approach 2:
The patent uses a composite approach by combining triazine-based UV absorbents with specific acrylic resin compositions. This composite material system achieves synergistic effects where the triazine-based UV absorbent provides stable UV protection without bleed-out, while the acrylic resin matrix ensures proper dispersion and long-term stability, resolving the contradiction between weather resistance and long-term stability.
2Reliability
If cyclohexyl (meth)acrylate monomer is added to improve hydrophobic performance, then hydrophobic performance is improved, but the surface protective layer hardens and workability deteriorates
Solution Approach 1:
The patent changes the monomer composition parameter by using acrylic resin compositions that do not contain cyclohexyl (meth)acrylate, or contain it in limited amounts. Instead, it employs alternative acrylic resin compositions with different monomer structures that provide adequate hydrophobic performance without causing excessive hardening, thus maintaining workability. This parameter change resolves the contradiction between hydrophobic performance and workability.
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 solution effectively prevents bleed-out and ensures long-term weather resistance, even in severe environments, without compromising the workability of the decorative sheet.
Implementation Method 1
a decorative sheet prepared by adding a UV absorbent to a decorative sheet has been proposed
Data Source
AI summary
Provided are: a decorative sheet and a decorative material having bleed-out suppression and long-term weather resistance maintenance, and a resin composition for surface protective layer. The decorative sheet has at least a substrate layer and a surface protective layer, wherein in the surface protective layer, the content of all the UV absorbents relative to 100 parts by mass of the resin therein is 10 parts by mass or less, and the surface protective layer satisfies the following: The layer contains a hydroxyphenyltriazine compound represented by general formula (I) and a hydroxyphenyltriazine compound represented by general formula (II) as UV absorbents, and the content of the hydroxyphenyltriazine compound represented by general formula (II) is 50% by mass or less relative to 100% by mass of the total of the content of the hydroxyphenyltriazine compound represented by general formula (I) and the content of the hydroxyphenyltriazine compound represented by general formula (II).