Transparent Heat Shielding Composition Using Tungsten Oxide
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Solution Overview
Problem
Conventional heat shielding films face challenges in achieving high light transmission and heat shielding performance simultaneously, with most materials compromising either visible light transmission or infrared rejection, and often having poor stability and high fabrication costs.
Innovation Solution
A transparent heat shielding composition comprising a thermoplastic resin material and a compound of formula MxWO3-yAy, where M is an alkali metal, W is tungsten, and A is a halogen, with specific doping to achieve high conductivity and no visible light absorption, combined with a compatibilizer for enhanced dispersion and shielding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent oxide conductive materials (ATO, ITO) are added to heat shielding products, then visible light transmission rate is increased, but infrared rejection is reduced by 50%
Solution Approach 1:
The patent changes the plasma wavelength parameter of the transparent oxide conductive material from >1000nm (conventional ATO/ITO) to 400-700nm by adjusting composition ratios and doping elements. This parameter shift enables simultaneous achievement of high visible light transmission and high infrared rejection, resolving the technical contradiction between these two properties.
Solution Approach 2:
The patent uses composite transparent oxide conductive materials containing multiple metal elements (e.g., Zn, In, Sn, Sb) in specific ratios, rather than single-element oxides. This composite approach allows tuning of electrical and optical properties to achieve both high transparency and high infrared shielding performance simultaneously.
2Object-affected harmful factors
If LaB6 with plasma wavelength of 700-1100 nm is added to heat shielding film products, then infrared rejection is improved, but visible light transmission rate is reduced
Solution Approach 1:
The patent shifts the plasma wavelength from the 700-1100nm range (LaB6) to the 400-700nm range through composition optimization. This parameter change allows the material to shield infrared radiation while remaining transparent to visible light, resolving the contradiction between infrared rejection and visible light transmission.
3Object-affected harmful factors
If multi-layered silver film is used for heat shielding, then heat shielding effect is excellent, but stability in air is poor
Solution Approach 1:
The patent replaces expensive and unstable silver film with a more stable transparent oxide conductive material system that provides comparable or superior heat shielding performance with long-term atmospheric stability, effectively substituting a short-living/unstable material with a durable alternative.
Solution Approach 2:
The patent employs composite transparent oxide materials with multiple metal elements and controlled doping to achieve heat shielding performance comparable to silver film while maintaining excellent atmospheric stability and weather resistance.
4Object-affected harmful factors
If heat shielding film is made with high infrared rejection, then heat shielding ability is improved, but visible light transmission rate is reduced
Solution Approach 1:
The patent fundamentally changes the plasma wavelength parameter to 400-700nm, which creates a selective optical response that shields infrared radiation while transmitting visible light. This parameter optimization resolves the contradiction by enabling differential transmission control at different wavelength ranges.
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 composition achieves high visible light transmission and infrared rejection, along with improved stability and reduced manufacturing costs, effectively addressing the limitations of conventional heat shielding materials.
Implementation Method 1
the plasma wavelength of the transparent oxide conductive materials is greater than 1000 nm... the compound of formula (I) has a plasma wavelength of 400 to 700 nm... when the infrared rejection of these materials is increased
Implementation Method 2
LaB6 having a plasma wavelength of 700 to 1100 nm, the heat shielding film product has better infrared rejection due to LaB6 having higher conductivity
Data Source
AI summary
Provided is a transparent heat shielding composition, which includes a thermoplastic resin material and a compound of formula (I)MxWO3-yAy (I),wherein M is an alkali metal, W is tungsten, O is oxygen, A is halogen, 0<x≦1 and 0<y≦0.5.