ATO Dispersion Liquid pH Control for Conductive Transparent Resin Films
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Solution Overview
Problem
Existing dispersion liquids of antimony-containing tin oxide (ATO) particles face issues with maintaining long-term dispersion stability and conductivity in resin films, particularly when the particle content is reduced for transparency, leading to insufficient conductivity and decreased pot life.
Innovation Solution
A dispersion liquid comprising ATO particles, an acidic compound, and a basic compound with a molecular weight of 180 to 500, specifically secondary or tertiary amines, is formulated to maintain a pH higher than the isoelectric point of ATO particles, utilizing steric repulsion and electrostatic aggregation to form conductive paths during film drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the content of ATO particles is reduced to increase transparency, then transparency is improved, but conductivity deteriorates
Solution Approach 1:
The patent changes the pH parameter of the dispersion liquid to be higher than the isoelectric point of ATO particles, which alters the surface charge and interaction between particles. This enables better dispersion stability and conductive path formation even at lower particle concentrations, resolving the contradiction between transparency and conductivity
Solution Approach 2:
The patent uses a composite system combining ATO particles with specific dispersants (having both acidic and basic functional groups) to create a dispersion liquid that maintains both transparency and conductivity. The dispersant forms a protective layer around particles while enabling conductive network formation at low concentrations
2Stability of the object's composition
If conventional dispersants are used, then dispersion stability is improved, but conductivity deteriorates
Solution Approach 1:
The patent specifies that the dispersant must have both acidic functional groups (carboxyl, sulfonic, or phosphonic acid groups) and basic functional groups (amine groups), creating an amphoteric dispersant system. This dual-functional approach maintains stable dispersion while enabling conductive path formation, unlike conventional single-function dispersants
Solution Approach 2:
The amphoteric dispersant acts as an intermediary between ATO particles and the dispersion medium, providing both steric stabilization through its molecular structure and conductive pathways through its ionic groups. This mediator enables simultaneous achievement of dispersion stability and conductivity
3Reliability
If pH is adjusted to improve conductivity, then conductivity is improved, but dispersion stability deteriorates
Solution Approach 1:
The patent establishes a specific pH range (higher than the isoelectric point of ATO particles) that simultaneously optimizes both dispersion stability and conductivity. The amphoteric dispersant maintains this pH balance, preventing particle aggregation while enabling conductive network formation
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 stabilizes ATO dispersion for extended periods, enabling the formation of highly conductive resin films with improved conductivity and transparency without increasing particle content, suitable for applications like transparent electrodes.
Implementation Method 1
utilizing steric repulsion and electrostatic aggregation to form conductive paths during film drying
Implementation Method 2
utilizing steric repulsion and electrostatic aggregation to form conductive paths during film drying
Implementation Method 3
the pH of the dispersion liquid assumes a value closer to the isoelectric point during a process of evaporating the dispersion medium from the dispersion liquid
Data Source
AI summary
A dispersion liquid is provided, which contains antimony-containing tin oxide particles, an acidic compound, a basic compound, and a dispersion medium, wherein the basic compound has a molecular weight of 180 to 500 and is at least one compound selected from the group consisting of secondary amines and tertiary amines represented by the following formula (1), the dispersion liquid has a pH higher than an isoelectric point of the antimony-containing tin oxide particles, and the pH of the dispersion liquid assumes a value closer to the isoelectric point during a process of evaporating the dispersion medium from the dispersion liquid:(In formula (1), R1 and R2 each independently represent an aliphatic hydrocarbon group, and R3 represents a hydrogen atom or an aliphatic hydrocarbon group.)