Composite Tungsten Oxide Particles for Clear Near-Infrared Shielding
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Solution Overview
Problem
Existing near-infrared shielding materials suffer from issues such as color darkening due to visible light absorption, reflective glare, and inadequate weather resistance, limiting their application and effectiveness.
Innovation Solution
Development of near-infrared absorbing material particles composed of composite tungsten oxide particles (M x W y O z ) with specific x/y and z/y ratios, particle sizes between 10 nm to 100 nm, and hexagonal, tetragonal, or cubic crystal structures, coated with Si, Ti, or Zr compounds for enhanced weather resistance and reduced visible light scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If black fine powder (carbon black, titanium black, organic pigments) is used for near-infrared shielding, then near-infrared absorption is improved, but visible light absorption increases causing color darkening
Solution Approach 1:
The patent applies local quality by using particles with specific optical properties that selectively absorb near-infrared radiation while maintaining visible light transmission. The spherical particles with controlled size distribution (0.1-10 μm) and refractive index create localized optical effects that target specific wavelength ranges, allowing near-infrared shielding without compromising visible light passage.
Solution Approach 2:
The patent employs composite materials by combining spherical particles with specific optical characteristics into a coating composition that integrates multiple functional properties. The particles are dispersed in a transparent binder matrix, creating a composite structure that achieves near-infrared absorption while maintaining overall transparency and avoiding color darkening.
2Object-affected harmful factors
If metal deposition film is applied for infrared reflection, then infrared shielding is improved, but reflective glare and half-mirror appearance occur
Solution Approach 1:
The patent inverts the conventional approach by using absorption rather than reflection for infrared shielding. Instead of applying metal films that reflect infrared radiation and create glare, the invention uses spherical particles that absorb near-infrared radiation through their optical properties, eliminating the reflective glare problem while maintaining shielding effectiveness.
Solution Approach 2:
The patent applies color changes principle by selecting particles with specific optical absorption characteristics that target near-infrared wavelengths while being transparent to visible light. This selective absorption creates no perceptible color change in the visible range, avoiding the darkening and glare issues associated with traditional approaches.
3Object-affected harmful factors
If conventional infrared shielding materials are used, then near-infrared absorption is achieved, but weather resistance is insufficient
Solution Approach 1:
The patent applies preliminary action by pre-coating the spherical particles with a protective layer before dispersion in the binder. This preliminary protective coating on the particles provides enhanced weather resistance from the outset, protecting the particles from environmental degradation and ensuring long-term durability of the infrared shielding function.
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 particles provide effective near-infrared absorption with improved weather resistance, maintaining transparency and reducing visible light scattering, suitable for applications requiring clear visibility and durability.
Implementation Method 1
near-infrared absorbing material particles which contain composite tungsten oxide particles
Implementation Method 2
coated with Si, Ti, or Zr compounds for enhanced weather resistance and reduced visible light scattering
Data Source
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AI summary
Near-infrared absorbing material particles contain composite tungsten oxide particles represented by a general formula MxWyOz, wherein the element M is one or more of elements selected from H, He, an alkali metal, an alkaline earth metal, a rare earth element, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I, wherein the W is tungsten, wherein the O is oxygen, and wherein the x, y, and z satisfy 0.001≤x/y≤1 and 3.0<z/y.