Composite Tungsten Oxide Dispersion in Polypropylene Resin
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Solution Overview
Problem
Conventional near-infrared absorbing material dispersions using tungsten oxide fine particles face issues with particle aggregation, leading to decreased near-infrared absorption properties.
Innovation Solution
A near-infrared absorbing material dispersion is developed using composite tungsten oxide fine particles dispersed in polypropylene resin, modified with maleic anhydride and carboxylic anhydride, which are uniformly distributed and stabilized by a modified polyolefin, ensuring high near-infrared absorption and optical transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tungsten oxide fine particles are used in conventional dispersions, then near-infrared absorption is achieved, but particle aggregation occurs leading to decreased absorption properties
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance that chemically bonds to both the tungsten oxide fine particles and the polymer matrix. This coupling agent prevents particle aggregation by creating a stable interface between the inorganic particles and organic matrix, thereby maintaining reliable near-infrared absorption properties throughout the product's lifespan.
Solution Approach 2:
The patent modifies the surface properties of tungsten oxide particles through silane treatment, changing their surface chemistry and charge characteristics. This parameter change prevents aggregation by creating electrostatic repulsion or steric hindrance between particles, ensuring stable dispersion and consistent near-infrared absorption performance.
2Illumination intensity
If fine particles are used to achieve transparency in visible light region, then geometric scattering is reduced, but near-infrared absorption may be compromised
Solution Approach 1:
The patent applies local quality by treating only the surface of tungsten oxide particles with silane coupling agents, while maintaining the bulk material's near-infrared absorbing properties. This selective modification allows the particles to remain transparent in visible light while preserving their near-infrared absorption capability through controlled surface chemistry changes.
Solution Approach 2:
The patent creates a composite structure where silane-modified tungsten oxide particles are dispersed in a polymer matrix. This composite approach combines the transparency benefits of fine particles with enhanced near-infrared absorption through the synergistic effect of the silane treatment and optimized particle distribution.
3Reliability
If uniform dispersion of composite tungsten oxide particles is achieved, then near-infrared absorption is enhanced, but requires modified polyolefin and controlled particle size
Solution Approach 1:
The patent controls the particle size parameter of tungsten oxide particles within a specific range (1-100 nm) and modifies the polyolefin's chemical properties through silane grafting. These parameter changes enable uniform dispersion and enhanced near-infrared absorption without requiring overly complex processing equipment or procedures.
Solution Approach 2:
The patent discards conventional complex dispersion methods requiring specialized equipment and recovers simplicity by using silane-modified polyolefin that provides inherent dispersion capability through molecular-level compatibility, reducing the need for large-scale production equipment.
4Stability of the object's composition
If modified polyolefin is added to achieve uniform dispersion, then particle distribution improves, but manufacturing process becomes more complex
Solution Approach 1:
The patent merges the dispersion agent function and matrix material function into a single silane-modified polyolefin component. This consolidation eliminates the need for separate dispersion agent addition steps and simplifies the manufacturing process while achieving uniform particle distribution through the modified polyolefin's inherent compatibility with tungsten oxide particles.
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 dispersion exhibits enhanced near-infrared absorption and maintains high transparency in the visible light region, outperforming conventional methods without the need for large-scale equipment, and can be molded into various shapes for efficient solar radiation absorption.
Implementation Method 1
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 2
the composite tungsten oxide fine particles are dispersed in the matrix of the polypropylene resin... exhibit higher near-infrared absorption property
Implementation Method 3
a modified polyolefin modified with one or more kinds selected from maleic anhydride and carboxylic anhydride... the composite tungsten oxide fine particles are uniformly dispersed in the polypropylene resin
Implementation Method 4
modified polyolefin modified with one or more kinds selected from maleic anhydride and carboxylic anhydride... stabilized by a modified polyolefin
Implementation Method 5
the composite tungsten oxide fine particles are dispersed in the matrix of the polypropylene resin... uniformly distributed and stabilized
Data Source
AI summary
Provided are a near-infrared absorbing material fine particle dispersion, a near-infrared absorber laminate, 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 laminates, and laminated structures for near-infrared absorption, containing tungsten oxides or composite tungsten oxides according to the conventional art. Also provided are a near-infrared absorbing material fine particle dispersion in which composite tungsten oxide fine particles, each particle containing a hexagonal crystal structure, and a polymer compound with maleic anhydride introduced therein are contained in the polypropylene resin, and the near-infrared absorber laminate and the laminated structure for near-infrared absorption using the dispersion.