Carbon Material Composition for Stable CNT Dispersion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fibrous carbon materials like carbon nanotubes and VGCFs have low solubility and dispersibility, leading to instability in solvents and difficulty in forming high-performance composite materials due to tangling, which affects their electrical and mechanical properties.
Innovation Solution
A carbon material composition comprising a fibrous carbon material, a water-based solvent, and a polyvinyl acetal resin with specific acetal group content, blockiness, and hydrophobic group properties is used to enhance dispersibility and reduce electrode resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fibrous carbon materials are used in the form of a composition in water or organic solvent, then they can be processed and applied, but they cannot maintain a stable dispersion state due to low solubility and low dispersibility
Solution Approach 1:
The patent introduces a polyvinyl butyral resin as an intermediary substance to mediate between the fibrous carbon material and the solvent. The resin adsorbs onto the carbon nanotube surfaces and provides steric stabilization, preventing aggregation and maintaining stable dispersion in the solvent system.
Solution Approach 2:
The patent creates a composite dispersion system comprising fibrous carbon material, polyvinyl butyral resin, and solvent. This composite approach combines the conductive properties of carbon nanotubes with the dispersibility and stability of the polymer resin, achieving both electrical functionality and dispersion stability.
2Reliability
If fibrous carbon materials with high aspect ratio are used to achieve excellent electrical, thermal, and mechanical properties, then they provide superior performance, but they easily tangle making it difficult to produce high-performance composite material
Solution Approach 1:
The polyvinyl butyral resin acts as a mediating agent that coats and separates the high-aspect-ratio fibrous carbon materials. This intermediary layer prevents tangling and aggregation during processing while maintaining the electrical pathways necessary for conductivity, thus enabling both high performance and ease of manufacture.
Solution Approach 2:
The patent changes the physical and chemical parameters of the fibrous carbon material surface by adsorbing polymer chains. This modifies the surface properties to reduce inter-fiber friction and tangling, while preserving the core electrical properties of the carbon material.
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 improved dispersibility and reduced electrode resistance, resulting in enhanced electrical conduction properties and mechanical stability of the composite material.
Implementation Method 1
a blockiness of hydrophobic groups measured by NMR of 0.35 or greater and 0.80 or less
Data Source
AI summary
The present invention provides a carbon material composition excellent in the dispersibility of a fibrous carbon material and capable of reducing electrode resistance. Provided is a carbon material composition containing: a fibrous carbon material; a water-based solvent; and a polyvinyl acetal resin, the polyvinyl acetal resin having an acetal group content of 40.0 mol % or less and a blockiness of hydrophobic groups measured by NMR of 0.35 or greater and 0.80 or less.