Method for producing composite material
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Solution Overview
Problem
Current composite materials with high concentrations of carbon nanotubes (CNTs) fail to achieve desired levels of electrical conductivity, heat conductivity, and mechanical strength for practical use due to intermediary agents causing insulation or heat conduction failures, and CNTs tend to aggregate, impairing the original functions of the base material.
Innovation Solution
A composite material is developed where CNTs are dispersed in a solution without intermediary agents, undergoing a reversible reaction to form a network structure that directly adheres to the base material, allowing for high electrical and heat conductivity and improved mechanical strength even at low CNT concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a large amount of dispersant is added to prevent CNT aggregation, then CNT dispersion uniformity is improved, but the composite material exhibits insulation or heat conduction failure due to the dispersant coating on CNT surfaces
Solution Approach 1:
The invention extracts and removes the harmful intermediary agents (dispersants and adhesives) from the CNT dispersion system. By using ultrasonic treatment and specific processing conditions, the patent achieves CNT dispersion and adhesion without requiring dispersants, thereby eliminating the insulating coating problem while maintaining dispersion uniformity.
Solution Approach 2:
The invention uses ultrasonic waves as a physical intermediary to achieve CNT dispersion and adhesion without chemical dispersants. The ultrasonic energy acts as a mediator to break CNT aggregates and facilitate uniform distribution and adhesion to the base material surface, replacing the function of chemical dispersants with a physical field.
2Reliability
If large quantities of CNTs are used to form a high-density CNT network, then electrical conductivity and mechanical strength are improved, but the original functions of the base material are impaired
Solution Approach 1:
The invention applies CNTs locally on the base material surface rather than uniformly throughout the bulk material. By concentrating CNTs on the surface to form a functional network, the patent achieves improved electrical conductivity and mechanical strength at the interface while minimizing CNT content in the overall composite, thus preserving the base material's original functions in the bulk.
Solution Approach 2:
The invention uses a minimal amount of CNTs (0.01-5 wt%) concentrated on the surface to achieve the desired functional improvement. This partial action approach focuses the CNT effect where it is most needed (at the surface interface) rather than distributing CNTs throughout the entire material, thereby achieving sufficient conductivity and strength enhancement without excessive CNT content that would impair base material functions.
3Strength
If adhesive and other additives are added to allow CNTs to adhere to the base material, then adhesion is improved, but the composite material exhibits insulation or heat conduction failure due to intermediary agent coating
Solution Approach 1:
The invention extracts and eliminates adhesive additives from the composite material system. By using ultrasonic treatment and optimized processing conditions, the patent achieves sufficient CNT adhesion to the base material without requiring adhesive coatings, thereby maintaining both adhesion strength and electrical/heat conductivity.
Solution Approach 2:
The invention replaces the chemical adhesion mechanism (using adhesives) with a physical field mechanism (ultrasonic treatment). The ultrasonic energy facilitates CNT adhesion through mechanical vibrations and cavitation effects, substituting the chemical bonding approach with a physical field approach that does not introduce insulating intermediary layers.
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 composite material exhibits enhanced electrical and heat conductivity, and improved mechanical strength due to direct CNT networking without intermediary agents, ensuring CNTs remain adhered to the surface, thus overcoming the limitations of conventional composite materials.
Implementation Method 1
since such CNTs irreversibly aggregate in the CNT nano-dispersion due to the van der Waals force
Implementation Method 2
upon this dispersion, ultrasonic irradiation or stirring is performed as an auxiliary treatment on the CNT nano-dispersion
Data Source
AI summary
A method for producing a composite material includes: preparing a dispersion, in which carbon nanotubes are dispersed without adding a dispersant or an adhesive; giving mechanical energy to the dispersion to create a reversible reaction condition in the dispersion, in which a dispersion state of the carbon nanotubes and an aggregation state of the carbon nanotubes are constantly generated; immersing the base material in the dispersion that is in the reversible reaction condition to allow the carbon nanotubes to adhere to the surface of the base material; and drawing the base material adhered with the carbon nanotubes from the dispersion, followed by drying.