Calcium Lanthanum Boride Particles for Heat Shielding
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Solution Overview
Problem
Existing heat ray shielding materials face challenges in achieving high visible light transmittance while maintaining effective heat shielding and stable weather resistance, as previous solutions either compromise on transparency, cost, or exhibit environmental instability.
Innovation Solution
Development of calcium-lanthanum boride fine particles with specific composition and shape, dispersed in a liquid medium, forming a heat ray shielding layer that balances infrared absorption with visible light transmittance and provides stable weather resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional heat ray shielding materials (SnO2, ATO, ITO) are used, then heat ray shielding properties are improved, but visible light transmittance decreases and cost increases
Solution Approach 1:
The patent changes the material parameters by using calcium-lanthanum boride fine particles with specific composition ratios (Ca:La = 1:9 to 9:1) and controlled particle sizes (0.1-10 μm). These parameter changes enable the material to achieve high heat ray shielding properties while maintaining excellent visible light transmittance, resolving the contradiction between shielding effectiveness and transparency
Solution Approach 2:
The patent employs composite materials by combining calcium-lanthanum boride with transparent resins (acrylic, polycarbonate, polyester) to create a composite heat ray shielding layer. This composite structure allows the inorganic boride particles to provide heat shielding while the organic resin matrix maintains transparency and provides mechanical stability, thus achieving both high heat ray blocking and good visible light transmission
2Reliability
If conventional heat ray shielding materials are used, then heat ray shielding properties are improved, but weather resistance and environmental stability deteriorate
Solution Approach 1:
The patent creates a composite structure where calcium-lanthanum boride fine particles are embedded in a transparent resin matrix. This composite design provides dual benefits: the inorganic boride particles deliver superior heat ray shielding properties, while the organic resin component provides excellent weather resistance, UV stability, and environmental durability, thus resolving the contradiction between shielding performance and compositional stability
Solution Approach 2:
The patent applies local quality by assigning different functional properties to different components: the calcium-lanthanum boride particles are optimized for heat ray absorption and blocking, while the transparent resin matrix is optimized for weather resistance, UV stability, and mechanical protection. This functional differentiation allows each component to excel at its specific function, achieving both high heat shielding and superior weather resistance
3Reliability
If particle size of heat ray shielding material is decreased, then heat ray shielding efficiency is improved, but manufacturing precision and dispersion control become more difficult
Solution Approach 1:
The patent optimizes the particle size parameter to a specific range of 0.1-10 μm for calcium-lanthanum boride fine particles. This parameter optimization achieves an ideal balance: particles are small enough to provide high heat ray shielding efficiency per unit mass and disperse uniformly in the resin, yet large enough to be easily handled during manufacturing and maintain stable dispersion without excessive aggregation, thus resolving the contradiction between shielding efficiency and manufacturing control
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 calcium-lanthanum boride fine particles effectively shield heat rays with high visible light transmittance and stable weather resistance, offering improved performance over previous materials by balancing absorption and transparency.
Implementation Method 1
infrared absorptive synthetic resin molded product obtained by molding a transparent resin containing tin oxide fine powder in a dispersed state... absorbs a light on a longer wavelength side than an infrared region in the sunlight... by an action of SnO2 fine powder contained in a dispersed state
Implementation Method 2
The infrared absorptive synthetic resin molded product having the above configuration absorbs a light on a longer wavelength side than an infrared region in the sunlight, and blocks transmission of the light
Implementation Method 3
heat ray shielding fine particles, capable of forming a heat ray shielding layer... heat ray shielding fine particle dispersion liquid using the heat ray shielding fine particles
Data Source
AI summary
Heat ray shielding fine particles contain calcium lanthanum boride fine particles represented by a general formula CaxLa1-xBm, a shape of each fine particle of the calcium lanthanum boride fine particles satisfies at least one of the following: 1) when scattering intensity of the calcium lanthanum boride fine particles diluted and dispersed in a solvent is measured using small-angle X-ray scattering, value Ve of a slope of a straight line is −3.8≤Ve≤−1.5, 2) the particle shape is a flat cylindrical shape, or a flat spheroidal (wherein a length of a long axis is d and a length of a short axis is h) shape, with a value of aspect ratio d/h being 1.5≤d/h≤20.