Multi-Walled Carbon Nanotube Composite Conductivity
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Solution Overview
Problem
Existing thermoplastic resin composites face challenges in achieving high conductivity while maintaining mechanical properties, as conventional conductive fillers like carbon black deteriorate physical properties and require large amounts, and carbon nanotubes often decompose during processing.
Innovation Solution
A composite is developed using multi-walled carbon nanotubes with specific diameter and graphene layer ranges, combined with reinforcing materials, to enhance conductivity and mechanical properties by minimizing nanotube decomposition and maintaining residual length during processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive carbon black is added to achieve high electrical conductivity, then conductivity is improved, but mechanical strength and thermal stability deteriorate due to decomposition during melt mixing
Solution Approach 1:
The patent changes the physical and chemical parameters of the conductive filler by using carbon nanotubes with specific diameter (10-30nm), wall structure (10-50 layers), and crystallinity (Id/Ig ≤ 1) instead of conventional carbon black, achieving high conductivity without mechanical property deterioration
Solution Approach 2:
The patent creates a composite material system combining thermoplastic resin with specifically structured carbon nanotubes and reinforcing materials, where the nanotube structure provides conductivity while the composite formulation maintains mechanical strength
2Reliability
If a large amount of carbon black is added to achieve high electrical conductivity, then conductivity is improved, but processability deteriorates
Solution Approach 1:
The patent changes the filler parameters from conventional carbon black to carbon nanotubes with controlled diameter (10-30nm) and structure, enabling high conductivity at lower concentrations and improving melt mixing processability
3Reliability
If carbon nanotubes are used to reduce the amount of conductive filler, then conductivity is improved with less filler, but mechanical properties deteriorate due to decomposition during processing
Solution Approach 1:
The patent applies preliminary action by pre-selecting carbon nanotubes with low Id/Ig ratio (≤1) indicating high crystallinity and structural integrity before processing, which prevents decomposition during melt mixing and maintains thermal stability
Solution Approach 2:
The patent specifies precise parameter ranges for carbon nanotubes including Id/Ig ≤ 1, diameter 10-30nm, and 10-50 wall layers to ensure resistance against decomposition during processing while maintaining conductivity
4Reliability
If carbon nanotubes are used to achieve high conductivity, then conductivity is improved, but the amount of filler required increases mechanical property deterioration
Solution Approach 1:
The patent optimizes the concentration and structural parameters of carbon nanotubes, using specifically structured nanotubes (10-30nm diameter, 10-50 layers, Id/Ig ≤ 1) that provide high conductivity at lower concentrations without compromising mechanical strength
Data Source
AI summary
The present invention provides a composite obtained by processing a resin composition including a thermoplastic resin, multi-walled carbon nanotubes, and a reinforcing material. The multi-walled carbon nanotubes have an average diameter of 10 nm or more and an Id/Ig of 1 or less. The walls of the multi-walled carbon nanotubes consist of 10 or more layers of graphene. The rate of residual length of the carbon nanotubes present in the composite is 40% or more. The composite has improved mechanical properties without deterioration of conductivity. Due to these advantages, the composite can be used to manufacture various molded articles.