Composite Tungsten Oxide Particles for Heat Shielding
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Solution Overview
Problem
Conventional laminated glass products face challenges in achieving sufficient heat ray-shielding while maintaining high visible light transmittance and mechanical performance, particularly in automotive and building applications, where haze values exceed acceptable limits and weather resistance is inadequate.
Innovation Solution
A heat ray-shielding particle-containing composition is developed, comprising composite tungsten oxide particles with a hexagonal crystal structure, dispersed with specific polymers and solvents, and integrated into a polyvinyl acetal resin-based film to create a laminated transparent base material with enhanced optical and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional heat ray-shielding particles are used in intermediate layers, then heat ray-shielding function is improved, but visible light transmittance decreases and haze increases
Solution Approach 1:
The patent changes the particle size parameter of heat ray-shielding particles to 0.01-10 μm (particularly 0.1-5 μm), which is smaller than conventional particles. This parameter change allows the particles to shield heat rays effectively while being small enough to maintain high visible light transmittance and low haze values (1-5%), resolving the contradiction between heat shielding and light transmission.
Solution Approach 2:
The patent uses composite heat ray-shielding particles consisting of metal oxide cores (such as tungsten oxide, molybdenum oxide) coated with silane coupling agents or other materials. This composite structure enhances the heat shielding efficiency per particle while maintaining optical transparency, allowing both heat ray-shielding function and visible light transmittance to be improved simultaneously.
2Object-affected harmful factors
If intermediate layers are added to laminated glass for heat ray-shielding, then heat ray-shielding function is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines heat ray-shielding particles directly into the polyvinyl acetal resin intermediate layer without requiring separate heat-shielding film layers. This merging of heat-shielding function into the existing intermediate layer simplifies the overall laminated glass structure while maintaining effective heat ray-shielding performance.
Solution Approach 2:
The patent makes the intermediate layer multi-functional by incorporating heat ray-shielding particles into the polyvinyl acetal resin, allowing it to simultaneously provide adhesion, penetration resistance, and heat ray-shielding functions. This eliminates the need for separate heat-shielding layers, reducing structural complexity.
3Object-affected harmful factors
If heat ray-shielding particles are dispersed in resin, then heat ray-shielding function is improved, but particle aggregation occurs reducing effectiveness
Solution Approach 1:
The patent uses silane coupling agents as intermediary substances that coat the surface of heat ray-shielding particles. These coupling agents improve the compatibility between inorganic particles and organic resin, preventing particle aggregation and ensuring uniform dispersion throughout the intermediate layer, thereby maintaining effective heat ray-shielding function.
Solution Approach 2:
The patent controls the particle size parameter within 0.01-10 μm and adjusts the concentration of dispersing agents in the resin matrix. These parameter changes optimize the balance between particle dispersion uniformity and heat ray-shielding effectiveness, preventing aggregation while maintaining composition stability.
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 laminated transparent base material with improved heat ray-shielding efficacy, maintaining high visible light transmittance, reduced haze, and enhanced weather resistance, while ensuring mechanical strength and stability.
Implementation Method 1
a heat ray-shielding particle-containing composition, containing a composite tungsten oxide particle expressed by a general formula MyWOz (wherein M is one or more kinds of element selected from Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, Sn, Al, and Cu, satisfying 0.1 ≤ y ≤ 0.5, 2.2 ≤ z ≤ 3.0), and having a hexagonal crystal structure
Data Source
AI summary
By use of composite tungsten oxide particles having a high heat ray-shielding effect while mainly composed of polyvinyl acetal resin, a heat ray-shielding particle is provided, having an excellent optical performance and a high weather resistance, which includes a composite tungsten oxide particle expressed by a general formula MyWOz (wherein M is one or more kinds of element selected from Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, Sn, Al, and Cu, satisfying 0.1 ≤ y ≤0. 5, 2.2 ≤ z ≤ 3.0) and having a hexagonal crystal structure; and at least one of a dispersant having an acrylic backbone, having an amino group as a functional group, and having a thermal decomposition temperature of 200°C or more, and a dispersant having an acrylic backbone, having a hydroxyl group or a carboxyl group as a functional group, and having a thermal decomposition temperature of 200°C or more, wherein a content of an organic solvent having a boiling point of 120°C or less is 5 mass% or less.