Decorative Sheet UV Absorber and TiO2 Coating
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Solution Overview
Problem
Decorative materials with titanium oxide pigments face issues of delamination, yellowing, and reduced weatherability due to photocatalytic degradation, especially when exposed to UV light, and existing solutions either limit design options or lead to contamination.
Innovation Solution
A decorative sheet with a substrate containing titanium oxide particles coated with Al and Si elements, and a surface protective layer with a specific UV absorber, maintaining a water vapor transmission rate between 0.75 g/m²·24 h and 45 g/m²·24 h to prevent delamination and enhance long-term adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the content of ultraviolet absorber in the surface protective layer is increased to prevent delamination and enhance UV absorption capacity, then the weatherability is improved, but the surface protective layer absorbs violet to blue light causing yellowing and deteriorating the design, and the ultraviolet absorber may bleed causing contamination
Solution Approach 1:
The patent changes the chemical parameters of the ultraviolet absorber by specifying particular compounds (benzotriazole type, benzophenone type, or triazine type) and their concentration ranges (0.01-5 mass% based on total sheet mass). This parameter optimization allows sufficient UV absorption while minimizing yellowing and bleeding effects.
Solution Approach 2:
The patent creates a composite structure by combining the surface protective layer containing ultraviolet absorbers with a substrate containing titanium oxide particles. This composite approach distributes the UV protection function across two components, allowing each to contribute optimally without excessive concentration of absorbers in one layer.
2Shape
If titanium oxide is used as white pigment in the substrate for design purposes, then the decorative appearance is improved, but the photocatalytic action of titanium oxide causes decomposition of resin and delamination, leading to decreased weatherability
Solution Approach 1:
The patent introduces an intermediary substance - the ultraviolet absorber in the surface protective layer - that mediates between the titanium oxide pigment and the resin substrate. The UV absorber intercepts harmful ultraviolet radiation before it reaches the resin, preventing photocatalytic degradation while allowing the titanium oxide to maintain its decorative white appearance.
Solution Approach 2:
The patent converts the potentially harmful photocatalytic activity of titanium oxide into a benefit by adding UV absorbers that work synergistically with the titanium oxide. The combination creates a dual protection system where the titanium oxide provides both aesthetic value and enhanced UV filtering when paired with the absorbers.
3Duration of action of stationary object
If a decorative sheet with UV absorber is used to prevent photocatalytic degradation, then the long-term adhesion is improved, but the initial tight contact strength may be insufficient causing springback and delamination at end surfaces
Solution Approach 1:
The patent optimizes physical parameters of the decorative sheet including thickness (0.1-1.0 mm), water vapor transmission rate, and UV absorber concentration to balance initial strength and long-term adhesion. These parameter adjustments ensure sufficient initial tight contact strength while maintaining 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 excellent weatherability, prevents delamination, and maintains design flexibility while ensuring long-term adhesion and application suitability.
Implementation Method 1
adds an ultraviolet absorber to a surface protective layer of a decorative sheet, which is to be exposed to light, thereby inhibiting the photocatalytic action of titanium oxide caused by ultraviolet light
Implementation Method 2
Titanium oxide exhibits a strong oxidizing power upon its photoexcitation. When a decorative member containing titanium oxide is used for an exterior member, the photocatalytic action of the titanium oxide can cause decomposition or a chemical reaction of a resin contained in the substrate
Implementation Method 3
the use of white pigment particles, composed of titanium oxide, whose surfaces are treated e.g. with an inorganic metal oxide in order to inhibit the photocatalytic action of the titanium oxide
Data Source
AI summary
There are provided a decorative sheet which has excellent weatherability and in which white pigment particles are dispersed well, and a decorative material using the decorative sheet, The decorative sheet includes at least a substrate and a surface protective layer, wherein the surface protective layer contains an ultraviolet absorber, and the substrate contains white pigment particles, and wherein the white pigment particles are titanium oxide particles having a coating containing Al element and Si element and formed on part or the whole of their surfaces, and contain Ti, Al and Si elements in the predetermined mass ratio, and a water vapor transmission rate of the decorative sheet satisfies the predetermined condition.