Composite Tungsten Oxide Dispersion With Iron Oxide Color Control
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Solution Overview
Problem
Existing infrared radiation-absorbing materials for windows, such as those using composite tungsten oxide fine particles, face issues with significant reduction in visible light transmittance when adjusted to a bronze color, and cannot achieve a neutral color tone between blue and bronze, failing to meet user preferences for design and functionality.
Innovation Solution
A combination of composite tungsten oxide fine particles and iron oxide (Fe2O3) fine particles is used, with a mass ratio of 0.01 to 0.5, to create a dispersion liquid and body that maintains high visible light transmittance and near-infrared absorbance, achieving a neutral color tone between blue and bronze.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If iron oxide fine particles are added to adjust color tone to bronze, then color tone is improved, but visible light transmittance significantly decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the mass ratio of iron oxide fine particles to composite tungsten oxide fine particles within the range of 0.01 to 0.5. This quantitative parameter control enables the color tone to be adjusted to neutral bronze while maintaining visible light transmittance above 30%, resolving the contradiction between color adjustment and light transmission.
Solution Approach 2:
The patent uses composite materials by combining iron oxide fine particles with composite tungsten oxide fine particles in a specific mass ratio. This composite approach allows the material to simultaneously achieve bronze color tone and high visible light transmittance, while maintaining near-infrared absorbance functionality.
2Ease of manufacture
If iron oxide fine particles are added to adjust color tone to bronze, then color tone is improved, but the material cannot achieve neutral color between blue and bronze
Solution Approach 1:
The patent applies parameter changes by precisely controlling the mass ratio of iron oxide fine particles to composite tungsten oxide fine particles within the range of 0.01 to 0.5. This quantitative parameter control enables the color tone to be adjusted to neutral bronze while maintaining visible light transmittance above 30%, resolving the contradiction between color adjustment and light transmission.
Solution Approach 2:
The patent uses composite materials by combining iron oxide fine particles with composite tungsten oxide fine particles in a specific mass ratio. This composite approach allows the material to simultaneously achieve bronze color tone and high visible light transmittance, while maintaining near-infrared absorbance functionality.
3Loss of energy
If composite tungsten oxide fine particles are used for infrared absorption, then near-infrared absorbance is improved, but visible light transmittance decreases when color is adjusted to bronze
Solution Approach 1:
The patent uses composite materials by combining iron oxide fine particles with composite tungsten oxide fine particles in a specific mass ratio. This composite approach allows the material to simultaneously achieve bronze color tone and high visible light transmittance, while maintaining near-infrared absorbance functionality.
Solution Approach 2:
The patent applies parameter changes by precisely controlling the mass ratio of iron oxide fine particles to composite tungsten oxide fine particles within the range of 0.01 to 0.5. This quantitative parameter control enables the color tone to be adjusted to neutral bronze while maintaining visible light transmittance above 30%, resolving the contradiction between color adjustment and light transmission.
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 infrared radiation-absorbing materials with high visible light transmittance and near-infrared absorbance, allowing for a neutral color adjustment to a desirable range in the L*a*b* color system, enhancing design flexibility and functionality.
Implementation Method 1
an infrared radiation-absorbing material fine particle dispersion body which have high transmittance for light in the visible light region and have absorbance in the near-infrared region
Implementation Method 2
a* and b* in the L*a*b* color system are made plus, so that the color tone of the solar-radiation-shielding material for vehicle windows can be adjusted to the bronze color side
Data Source
AI summary
To provide an infrared radiation-absorbing material fine particle dispersion liquid and dispersion body which have high transmittance for light in the visible light region and have absorbance in the near-infrared region, and which can be adjusted to a neutral color between blue and bronze. Provided is an infrared radiation-absorbing material fine particle dispersion liquid or dispersion body comprising infrared radiation-absorbing material fine particles and iron oxide (Fe2O3) fine particles in a liquid or solid medium, wherein the infrared radiation-absorbing material fine particles are formed of composite tungsten oxide fine particles which are represented by a general formula MYWOZ (where the element M is an element selected from Cs, Rb, K, Tl, In, and the like, W is tungsten, 0.001≤Y≤1.0, and 2.2≤Z≤3.0), and which have a hexagonal crystal structure, and a mass ratio between the iron oxide fine particles and the composite tungsten oxide fine particles contained in the liquid or solid medium [iron oxide fine particles/composite tungsten oxide fine particles] is 0.01 or more and 0.1 or less.