Infrared-absorbing particle dispersion with polyether dispersant
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Solution Overview
Problem
Existing infrared-absorbing fine particle dispersion liquids face issues with low near-infrared absorbing fine particle content, poor storage stability, and high solvent content, which affect their applicability and performance in various fields.
Innovation Solution
A composition comprising infrared-absorbing fine particles, a dispersant with a polyether structure and a glass transition temperature of −150° C. or higher and 0° C. or lower, and a solvent with a content of 10 mass % or less, allowing for high long-term storage stability and adjustable particle concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the content of near-infrared absorbing fine particles in the dispersion liquid is increased to 25 mass % or more, then the infrared absorption performance and concentration adjustment allowance are improved, but the storage stability deteriorates due to particle aggregation and dispersant-solvent separation
Solution Approach 1:
The patent changes the chemical composition parameters of the dispersant, specifically using a polyether-based dispersant with a glass transition temperature of -150°C or higher and 0°C or lower. This parameter change enables the dispersant to effectively stabilize high concentrations of infrared-absorbing fine particles (25 mass % or more) while maintaining storage stability and preventing aggregation over time.
2Quantity of substance
If the solvent content in the dispersion liquid is reduced to achieve high particle concentration, then the infrared absorption characteristics are enhanced, but the storage stability and processability deteriorate
Solution Approach 1:
The patent introduces a specifically designed polyether-based dispersant as an intermediary substance. This dispersant acts as a mediator between the infrared-absorbing fine particles and the solvent system, enabling high particle concentration (low solvent content) while maintaining storage stability. The dispersant prevents direct interaction between particles that would cause aggregation, thus stabilizing the high-concentration formulation.
3Object-affected harmful factors
If water is used as the main solvent in the dispersion liquid, then the environmental load is reduced, but the wettability to transparent base material and drying condition control become problematic
Solution Approach 1:
The patent uses a polyether-based dispersant as an intermediary that bridges water and the transparent base material. This dispersant improves wettability by reducing surface tension and enhancing adhesion, while also controlling drying conditions by modulating evaporation rates. This allows water to be used as the main solvent for environmental benefits while overcoming the associated application problems.
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 proposed composition achieves high long-term storage stability and low solvent content, enhancing its applicability in various fields, including printing ink applications and solar radiation shielding, while maintaining excellent infrared absorption characteristics.
Implementation Method 1
the dispersant has a polyether structure, has a glass transition temperature of −150° C. or higher and 0° C. or lower
Implementation Method 2
a dispersant having a polyether structure and having a glass transition temperature of −150° C. or higher and 0° C. or lower
Implementation Method 3
an infrared-absorbing fine particle-containing composition that transmits light in a visible light region and absorbs light in an infrared region
Data Source
AI summary
An infrared-absorbing fine particle-containing composition, including: infrared absorbing fine particles, a dispersant, and a solvent, wherein the dispersant has a polyether structure, has a glass transition temperature of −150° C. or higher and 0° C. or lower, and is contained in an amount of 10 parts by mass or more with respect to 100 parts by mass of the infrared absorbing fine particles, and a solvent content is 10 mass % or less.