Hexagonal Tungsten Oxide Heat-Shielding Film
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Solution Overview
Problem
Conventional laminated glasses with high visible light transmittance suffer from insufficient heat-ray shielding function and poor weather resistance, particularly when using composite tungsten oxide fine particles in polyvinyl acetal resin, which compromises mechanical strength and optical characteristics over time.
Innovation Solution
A heat-ray shielding film is developed using composite tungsten oxide fine particles with a hexagonal crystal structure, mixed with a dispersant and metal carboxylate in polyvinyl acetal resin, and molded into a film shape using an extrusion method, achieving high visible light transmittance and strong near-infrared absorption while maintaining mechanical strength and weather resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional laminated glass uses composite tungsten oxide fine particles in polyvinyl acetal resin to achieve heat-ray shielding, then heat-ray shielding function is improved, but visible light transmittance deteriorates and weather resistance decreases
Solution Approach 1:
The patent changes the crystal structure parameter of tungsten oxide from conventional cubic structure to hexagonal crystal structure. This parameter change enables the material to achieve superior heat-ray shielding performance while maintaining high visible light transmittance and excellent weather resistance, resolving the contradiction between heat-ray shielding function and reliability
Solution Approach 2:
The patent creates a composite material system by combining hexagonal crystal structure tungsten oxide fine particles with polyvinyl acetal resin. This composite structure allows the tungsten oxide particles to provide heat-ray shielding while the resin matrix maintains transparency and durability, achieving both improved heat-ray shielding and maintained weather resistance
2Loss of energy
If high concentration of heat-ray shielding particles is used to improve heat-ray shielding function, then near-infrared absorption is improved, but visible light transmittance deteriorates
Solution Approach 1:
The patent utilizes the unique optical properties of hexagonal crystal structure tungsten oxide, which has strong absorption in near-infrared region while maintaining transparency in visible light region. This crystal structure parameter enables selective absorption without compromising visible light transmittance, allowing high near-infrared absorption with preserved illumination
Solution Approach 2:
The hexagonal crystal structure tungsten oxide particles exhibit localized optical properties where they strongly absorb near-infrared radiation while remaining transparent to visible light. This local quality differentiation allows the material to perform heat-ray shielding in specific wavelength ranges without affecting overall transparency
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 a heat-ray shielding film with excellent optical characteristics and high weather resistance, ensuring effective heat-ray shielding while maintaining transparency and mechanical integrity, even after long-term use.
Implementation Method 1
a maximum transmittance is exhibited in a visible light region, and a strong absorption is exhibited in a near infrared region
Data Source
AI summary
To provide a heat-ray shielding film mainly composed of polyvinyl acetal resin and a method for manufacturing the same capable of exhibiting excellent optical characteristics and high weather resistance by using composite tungsten oxide fine particles having a high heat-ray shielding effect, and a heat-ray shielding laminated transparent base material using the heat-ray shielding film, the heat-ray shielding film containing fine particles having a heat-ray shielding function, polyvinyl acetal resin, and a plasticizer, wherein the fine particles having the heat-ray shielding function is expressed by a general formula MyWOz (wherein N is one kind or more elements selected from a group consisting of Cs, Rb, K, Tl, In, Ba, Li, Sr, Fe, Sn, Al, and Cu, satisfying 0.1≤y≤0.5, 2.2≤z≤3.0), which are composite tungsten oxide fine particles having a hexagonal crystal structure, the heat-ray shielding film further containing metal carboxylate.