Flaky Titanium Oxide Film Material for Near-Infrared Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional near-infrared-shielding materials, such as fine titanium oxide particles, are limited in variety and often shield visible light, which is undesirable for applications like cosmetics and paints where color appearance is important, and lack versatility for other uses like resin molded articles.
Innovation Solution
A near-infrared-shielding material composed of flaky particles with a flaky substrate and a single-layer titanium oxide film, optimized for wavelengths between 800 nm and 1400 nm, providing high reflectance and various colors through interference effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fine titanium oxide particles with average particle diameter of about 1 μm are used as near-infrared-shielding material, then near-infrared reflectance is high, but visible light transmission is shielded too much and beautiful appearance is lost
Solution Approach 1:
The invention changes the particle shape parameter from spherical to flaky, and optimizes the thickness parameter to 0.6 μm or less. This parameter change enables the material to achieve high near-infrared reflectance while maintaining beautiful visible light appearance, resolving the contradiction between shielding effect and aesthetic quality
Solution Approach 2:
The invention uses composite flaky particles comprising a flaky substrate (such as glass flake) with a single-layer titanium oxide film formed on its surface. This composite structure combines the shielding properties of titanium oxide with the optical properties of the flaky substrate, achieving both effective near-infrared shielding and beautiful visible light transmission
2Object-affected harmful factors
If conventional fine particle techniques are used for near-infrared shielding, then near-infrared attenuation is achieved, but material variety is limited and versatility for different applications is insufficient
Solution Approach 1:
The invention introduces multiple adjustable parameters including flake thickness (0.6 μm or less), titanium oxide film thickness (80-165 nm), and substrate material type. These parameter variations enable creation of diverse near-infrared-shielding materials with different properties, significantly expanding material variety and versatility for different applications such as cosmetics, paints, and resin molded articles
Solution Approach 2:
The flaky particle structure with controlled thickness and surface coating provides universal applicability across multiple fields. The same basic structure can be optimized for different uses: cosmetics (with specific thickness ranges for skin application), paints (for vehicle and building applications), and resin molded articles, making the material highly versatile
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 material efficiently attenuates near-infrared light while allowing visible light transmission, offering a range of colors suitable for cosmetics and decorative effects, and maintaining electric wave transmission properties.
Implementation Method 1
The present inventors conceived attenuating transmission of near-infrared light using an interference effect
Implementation Method 2
Conventional near-infrared-shielding materials as disclosed in Patent Literature 1 take advantage of a shielding effect accompanying what is called Mie scattering
Data Source
AI summary
A new material efficiently attenuating transmission of near-infrared light is provided. A provided near-infrared-shielding material includes a plurality of flaky particles, wherein each of the plurality of flaky particles includes a flaky substrate and a single-layer film formed on a principal surface of the flaky substrate, and the near-infrared-shielding material has a light reflectance of 40% or more between wavelengths of 800 nm and 1400 nm. The flaky substrate is, for example, a glass flake. The glass flake has an average thickness of, for example, 0.6 μm or less. The single-layer film includes, for example, titanium oxide and has an average thickness of, for example, 80 nm to 165 nm.