Near-Infrared Absorbing Adhesive Layer With Low Haze Stability
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Solution Overview
Problem
Existing near-infrared absorbing films suffer from insufficient near-infrared absorption properties, oxidative fading of near-infrared absorbers due to exposure to air, and issues with adhesive compositions that become cloudy or gel quickly, leading to reduced productivity and high haze values.
Innovation Solution
An adhesive layer containing composite tungsten oxide fine particles with specific lattice constants, a dispersant, a metal coupling agent with an amino group, and a crosslinking agent, which are stabilized by a surface coating, ensuring high near-infrared absorption and low haze while maintaining stability and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If near-infrared absorbing films are used to shield solar energy and reduce cooling load, then near-infrared absorption ability is improved, but the absorbers undergo oxidative fading due to exposure to air, reducing reliability
Solution Approach 1:
The patent uses composite tungsten oxide fine particles (MxWyOz) as the near-infrared absorbing material, combining tungsten oxide with metal elements (Ca, Sr, Ba, Pb, or Bi) to create a composite structure that maintains stable near-infrared absorption properties without oxidative fading, resolving the reliability issue
Solution Approach 2:
The patent creates a protective environment by incorporating the near-infrared absorbing particles into an adhesive layer that shields them from direct exposure to air, effectively creating an inert environment that prevents oxidative fading while maintaining absorption stability
2Productivity
If adhesive compositions are used to form adhesive layers with near-infrared absorbing particles, then near-infrared absorption is achieved, but the compositions become cloudy or gel quickly, reducing productivity
Solution Approach 1:
The patent specifies precise parameter ranges for the adhesive composition including particle size (0.1-10 μm), metal content ratios (0.01<x/y≤1, 2.0<z/y≤3.0), and adhesive composition ratios, which control the chemical and physical properties to prevent clouding and gelation while maintaining composition stability during application
Solution Approach 2:
The patent uses a coupling agent as an intermediary substance between the near-infrared absorbing particles and the adhesive resin, improving compatibility and dispersion stability, which prevents the composition from becoming cloudy or gelling quickly, thereby maintaining productivity
3Reliability
If inorganic particles are used as near-infrared absorbers, then absorption ability is improved, but haze value increases, reducing transparency
Solution Approach 1:
The patent optimizes the local properties of the inorganic particles by controlling their size distribution (0.1-10 μm), shape, and refractive index, creating particles with specific local characteristics that absorb near-infrared light while minimizing visible light scattering, thus maintaining transparency
Solution Approach 2:
The patent changes the physical parameters of the inorganic particles including size, shape, and refractive index to optimize the balance between near-infrared absorption and visible light transmission, reducing haze value while maintaining absorption ability
4Reliability
If ATO and ITO particles are used as heat ray absorbing particles, then near-infrared absorption is attempted, but absorption properties are insufficient
Solution Approach 1:
The patent replaces单一的 ATO and ITO particles with composite tungsten oxide particles (MxWyOz) that combine tungsten oxide with metal elements, creating a composite material with superior near-infrared absorption properties and higher absorption efficiency
Solution Approach 2:
The patent changes the chemical composition parameters by using tungsten oxide with specific metal additives and controlling the oxidation state (z/y ratio), which fundamentally improves the near-infrared absorption mechanism and efficiency compared to ATO and ITO
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 adhesive layer effectively absorbs near-infrared light, maintains transparency in the visible light region, and exhibits improved stability, reducing haze and production issues, thus enhancing productivity and cost-effectiveness.
Implementation Method 1
an adhesive layer containing composite tungsten oxide fine particles... which effectively absorbs near-infrared light
Implementation Method 2
a near-infrared absorbing layer capable of shielding a part of a solar energy that enters cars or buildings and reducing a cooling load
Implementation Method 3
a metal coupling agent with an amino group... stabilized by a surface coating
Implementation Method 4
a metal coupling agent having an amino group
Implementation Method 5
a crosslinking agent... ensuring high near-infrared absorption and low haze while maintaining stability
Implementation Method 6
stabilized by a surface coating, ensuring high near-infrared absorption and low haze
Data Source
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AI summary
There are provided an adhesive composition, an adhesive layer, that transmit light in a visible light region and has an ability to absorb light in a near-infrared region, has a low haze value, and is excellent in stability, and a near-infrared absorbing film, a laminated structure, a laminated body using the above adhesive composition and adhesive layer, and are provided an adhesive layer, a near-infrared absorbing film, a laminated structure, a laminated body, and an adhesive composition containing composite tungsten oxide fine particles, a dispersant, a metal coupling agent having an amino group, an adhesive, and a crosslinking agent, wherein the composite tungsten oxide fine particles include a hexagonal crystal structure, and the composite tungsten oxide fine particles have lattice constant values such as 7.3850 Å or more and 7.4186 Å or less on the a-axis, and 7.5600 Å or more and 7.6240 Å or less on the c-axis, and the composite tungsten oxide fine particles having an average particle size of 100 nm or less.