Decorative Sheet Layering for Heat-Shielding Dark Finishes
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Solution Overview
Problem
Existing decorative sheets with carbon black pigments suffer from inadequate heat-shielding properties when exposed to sunlight, leading to deformation and delamination, and attempts to enhance darkness through thicker layers or higher pigment content compromise printability and weatherability.
Innovation Solution
A decorative sheet with an infrared-reflective substrate and a decorative layer containing a solid printing layer with infrared-transparent or reflective pigments like quinacridone, isoindolinone, nickel azo complex, and phthalocyanine, and a picture layer with carbon black, which balances heat-shielding and darkness while maintaining printability and weatherability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If carbon black is used to form a solid printing layer and picture layer to achieve darkness, then the degree of darkness is improved, but the heat-shielding properties deteriorate due to infrared light absorption
Solution Approach 1:
The patent divides the decorative sheet into multiple functional layers: an infrared-reflective substrate layer, a solid printing layer with infrared-transparent/reflective pigments, and a picture layer with carbon black. This segmentation allows each layer to perform its specific function - the substrate reflects infrared heat while the picture layer provides darkness, resolving the contradiction between heat-shielding and darkness.
Solution Approach 2:
The patent applies different pigment compositions to different layers: the solid printing layer uses infrared-transparent or reflective pigments for heat shielding, while the picture layer uses carbon black for darkness. This local differentiation of material properties allows simultaneous achievement of heat-shielding properties and degree of darkness without mutual interference.
2Illumination intensity
If the thickness of the picture layer or the amount of azomethine-azo pigment is increased to improve the degree of darkness, then the degree of darkness is improved, but the printability deteriorates due to blocking or back-trapping
Solution Approach 1:
The patent changes the chemical composition parameter of the pigments used in the solid printing layer, selecting infrared-transparent or reflective pigments with specific optical properties. This parameter change allows adequate darkness to be achieved without increasing layer thickness or pigment amount to excessive levels, thereby maintaining printability and avoiding blocking or back-trapping issues.
3Illumination intensity
If the thickness of the picture layer or the amount of pigment is increased to improve the degree of darkness, then the degree of darkness is improved, but the weatherability deteriorates
Solution Approach 1:
The patent applies different pigment compositions to different layers: the solid printing layer uses infrared-transparent or reflective pigments with good weatherability, while the picture layer uses carbon black for darkness. This local differentiation allows each layer to be optimized for its specific function without compromising overall weatherability, as the infrared-reflective substrate and carefully selected pigments provide UV resistance and durability.
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 provides a decorative sheet with improved heat-shielding properties and a high degree of darkness without compromising printability or weatherability, making it suitable for architectural and vehicular applications.
Implementation Method 1
an infrared-reflective substrate
Implementation Method 2
the infrared-transparent or infrared-reflective pigment containing (A) at least three compounds selected from the pigment group consisting of a quinacridone, an isoindolinone, a nickel azo complex and a phthalocyanine
Implementation Method 3
the infrared-transparent or infrared-reflective pigment containing (B) at least one compound selected from the pigment group consisting of a composite oxide containing manganese and at least one metal element other than manganese
Implementation Method 4
the carbon black will absorb infrared light, thereby raising the temperature of the decorative sheet
Data Source
AI summary
There is provided a decorative sheet which has satisfactory heat-shielding properties and can exhibit a design which is excellent in the degree of darkness. The decorative sheet includes an infrared-reflective substrate, and a decorative layer disposed on the substrate and including a solid printing layer and a picture layer, wherein the solid printing layer contains an infrared-transparent or infrared-reflective pigment and a binder resin, the infrared-transparent or infrared-reflective pigment containing (A) at least three compounds selected from the pigment group consisting of a quinacridone, an isoindolinone, a nickel azo complex and a phthalocyanine, or (B) at least one compound selected from the pigment group consisting of a composite oxide containing manganese and at least one metal element other than manganese, an azomethine-azo compound and a perylene compound, and wherein the picture layer at least partly contains carbon black and a binder resin.