Composite Tungsten Oxide Dispersion Preventing Aggregation
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Solution Overview
Problem
Near-infrared absorbing material fine particle dispersions containing tungsten oxides can aggregate in solid media, leading to reduced transparency.
Innovation Solution
A dispersion of composite tungsten oxide fine particles and a silane compound in an acrylic resin, where the silane compound is selected from silane coupling agents, alkoxysilane compounds, or silicone resins with specific functional groups, is used to prevent aggregation and enhance near-infrared absorption while maintaining transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If tungsten oxide fine particles are dispersed in a solid medium to achieve near-infrared absorption, then near-infrared absorption property is improved, but particle aggregation occurs leading to reduced transparency
Solution Approach 1:
A silane compound is introduced as an intermediary substance between the tungsten oxide fine particles and the acrylic resin matrix. The silane compound prevents particle aggregation by acting as a dispersing agent, thereby maintaining transparency while preserving near-infrared absorption properties.
Solution Approach 2:
The invention creates a composite material system consisting of tungsten oxide fine particles, silane compound, and acrylic resin. This composite structure allows the tungsten oxide particles to maintain their near-infrared absorption capability while the silane compound ensures uniform dispersion and prevents aggregation, thus maintaining optical transparency.
2Use of energy by moving object
If conventional infrared shielding materials are used to block near-infrared radiation, then near-infrared absorption is improved, but visible light transmittance and transparency are reduced
Solution Approach 1:
The invention applies local quality by using fine particles (1-800 nm) that are small enough to be transparent to visible light while still providing near-infrared absorption. The silane compound ensures these particles remain uniformly dispersed at this optimal size scale, preventing aggregation that would compromise transparency.
Solution Approach 2:
The invention changes the particle size parameter to the nanometer scale (1-800 nm), which is small enough to allow visible light transmission while maintaining near-infrared absorption capability. The silane compound helps maintain this critical particle size distribution by preventing aggregation during processing and application.
3Productivity
If large-scale production equipment and high-temperature heat treatment are used for film formation, then manufacturing capability is improved, but production complexity and cost increase
Solution Approach 1:
The silane compound provides self-service functionality by enabling the dispersion to self-stabilize and self-assemble into uniform films without requiring complex production equipment. The silane-modified particles naturally disperse and adhere to substrates under mild conditions, eliminating the need for large-scale specialized manufacturing equipment.
Solution Approach 2:
The invention replaces complex mechanical film formation systems with a chemical solution approach. The silane compound enables solution-based processing where films are formed by simple coating and drying processes, substituting complex mechanical equipment with straightforward chemical-physical processes.
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 achieves higher near-infrared absorption with improved transparency and optical properties compared to conventional methods, allowing for efficient solar radiation absorption without the need for large-scale equipment or high-temperature processing.
Implementation Method 1
composite tungsten oxide fine particles and a silane compound in an acrylic resin
Implementation Method 2
the silane compound is one or more kinds selected from a silane coupling agent, an alkoxysilane compound, and a silicone resin
Implementation Method 3
a material containing free electrons exhibits a reflection/absorption response due to plasma oscillation, with respect to an electromagnetic wave of a wavelength from 200 nm to 2,600 nm, which is close to solar radiation region
Implementation Method 4
exhibits higher near-infrared absorption property
Implementation Method 5
when the particles of the powder forming the material are fine particles having diameters smaller than the wavelength of light, the geometric scattering of the material in the visible light region (wavelength: 380 nm to 780 nm) is reduced so that transparency in the visible light region is achieved
Implementation Method 6
Acrylic resins have transparency similar to or superior to that of glass, as well as excellent weather resistance, chemical resistance, and optical properties
Data Source
AI summary
Provided are a near-infrared absorbing material fine particle dispersion, a near-infrared absorber, and a laminated structure for near-infrared absorption, which can exhibit higher near-infrared absorption property, compared to near-infrared fine particle dispersions, near-infrared absorber, and laminated structures for near-infrared absorption, containing tungsten oxides or composite tungsten oxides according to the conventional art. Also provided is a near-infrared absorbing material fine particle dispersion, wherein composite tungsten oxide fine particles, each particle containing a hexagonal crystal structure, and a silane compound are contained in an acrylic resin.