Metal Particle Composition With Modified Cellulose for High Viscosity
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Solution Overview
Problem
Existing metal particle-containing compositions face a trade-off between high metal particle content and viscosity, making it difficult to achieve both high viscosity and stability at elevated temperatures.
Innovation Solution
A metal particle-containing composition comprising modified cellulose fibers with anionic groups via covalent bonds and an organic compound, which enhances dispersibility and viscosity even with high metal particle content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the content of metal particles is increased to obtain desired characteristics, then the electrical conductivity and functional performance are improved, but the viscosity of the composition decreases and it becomes difficult to achieve high viscosity
Solution Approach 1:
The patent changes the chemical structure parameters of the cellulose fiber by introducing anionic groups (such as carboxyl groups) through oxidation or substitution reactions. This modifies the electrostatic interactions and hydrogen bonding capabilities of the thickening agent, enabling it to maintain high viscosity even with high metal particle content (70 parts by mass or more based on 100 parts by mass of solid ingredients).
Solution Approach 2:
The patent creates a composite system consisting of modified cellulose fiber (with anionic groups), metal particles, and organic compound. This composite structure leverages the electrostatic repulsion and steric hindrance provided by the modified cellulose fiber to prevent metal particle aggregation while maintaining high viscosity, resolving the contradiction between metal particle content and viscosity.
2Stability of the object's composition
If the blended amount of thickening agent is increased to enhance viscosity, then the viscosity of the composition is improved, but the solid content other than thickening agent decreases
Solution Approach 1:
The patent modifies the molecular structure of cellulose fiber by introducing anionic groups, which changes the thickening mechanism from purely physical entanglement to a combination of electrostatic repulsion, hydrogen bonding, and steric hindrance. This allows achieving high viscosity with lower thickening agent content, thereby maintaining higher solid content overall.
Solution Approach 2:
The modified cellulose fiber with anionic groups creates localized regions of high charge density and steric bulk around metal particles. This local structural modification provides disproportionate thickening effect, allowing the system to achieve high viscosity without proportionally increasing the overall thickening agent content.
3Reliability
If the content of metal particles is increased to obtain desired characteristics, then the electrical conductivity is improved, but the decrease in viscosity at high temperature becomes more significant
Solution Approach 1:
The patent introduces anionic groups with permanent charge that maintain electrostatic repulsion even at elevated temperatures. The modified cellulose fiber structure with groups like -COO⁻ provides thermal stability to the thickening effect, counteracting the tendency for viscosity decrease at high temperature that would otherwise occur with high metal particle content.
Solution Approach 2:
The modified cellulose fiber with anionic groups provides preemptive steric and electrostatic barriers around metal particles before thermal aggregation can occur. This pre-established protective structure cushions against the viscosity-decreasing effect of high temperature, maintaining composition stability even when metal particle content is high.
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 composition achieves high viscosity and stability, enabling the production of films and electrically conductive members with improved properties.
Implementation Method 1
a modified cellulose fiber having a modifying group in an anionic group of an anion-modified cellulose fiber via a covalent bond
Implementation Method 2
a modified cellulose fiber having a modifying group in an anionic group of an anion-modified cellulose fiber via a covalent bond
Implementation Method 3
an organic compound which is liquid at 25°C under 1 atm
Data Source
AI summary
The present invention relates to a metal particle-containing composition containing the following component (A), component (B) and component (C), wherein the content of the component (B) based on 100 parts by mass of solid ingredients in the metal particle-containing composition is 70 parts by mass or more, as well as a method of producing a film and a method of producing an electrically conductive member using the metal particle-containing composition: (A) a modified cellulose fiber having a modifying group at an anionic group of an anion-modified cellulose fiber via a covalent bond; (B) metal particles; and (C) an organic compound which is liquid at 25°C under 1 atm.