Low-Density Carbon Nanotubes for Conductive Low-Viscosity Composites
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Solution Overview
Problem
Conventional carbon nanotubes increase the viscosity of composite materials, affecting their molding and productivity when mixed with polymers, necessitating the development of carbon nanotubes with improved viscosity and fluidity for effective conductivity.
Innovation Solution
Carbon nanotubes with a number average particle size of 40 to 120 μm and a bulk density of 25 kg/m3 or less are produced using a fluidized bed reactor equipped with a side nozzle, which prevents aggregate formation by injecting additional gas through the nozzle, ensuring reduced particle size and density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional carbon nanotubes are mixed with polymers to produce composite materials, then electrical conductivity is achieved, but the viscosity of the composite materials increases significantly
Solution Approach 1:
The patent changes the physical parameters of carbon nanotubes by controlling their particle size (40-120 μm) and bulk density (≤25 kg/m³) through fluidized bed reactor processing. These parameter modifications reduce the viscosity increase when mixed with polymers while maintaining electrical conductivity, directly resolving the contradiction between conductivity and viscosity.
Solution Approach 2:
The patent creates local quality differences by producing carbon nanotubes with specific size and density characteristics through controlled fluidized bed reactor conditions. The side nozzle introduces localized gas flow that prevents aggregate formation, creating uniform distribution characteristics that reduce viscosity while maintaining conductivity properties.
2Reliability
If conventional carbon nanotubes are used in composite materials, then conductivity is improved, but productivity is reduced due to molding difficulties
Solution Approach 1:
By modifying carbon nanotube parameters (particle size of 40-120 μm and bulk density of ≤25 kg/m³), the patent improves fluidity and reduces molding difficulties, thereby increasing productivity while maintaining conductivity. The parameter changes make the material more suitable for industrial processing.
Solution Approach 2:
The patent converts the potential harm of high viscosity (which causes molding difficulties) into a benefit by controlling carbon nanotube aggregation. The fluidized bed reactor with side nozzle prevents harmful aggregates from forming, creating uniform particle distribution that improves both conductivity and productivity.
3Manufacturing precision
If carbon nanotubes are produced with small particle size, then number average particle size is reduced, but aggregate formation increases
Solution Approach 1:
The patent uses gas flow as an intermediary substance in the fluidized bed reactor. The gas flow acts as a mediator that prevents carbon nanotubes from aggregating while maintaining small particle size (40-120 μm). The side nozzle introduces additional gas flow that specifically prevents aggregate formation, resolving the contradiction between particle size control and aggregate stability.
Solution Approach 2:
The patent applies dynamic gas flow conditions in the fluidized bed reactor to prevent static aggregate formation. The continuous gas flow creates dynamic conditions that keep carbon nanotubes dispersed, allowing precise control of particle size while preventing aggregation. The side nozzle adds dynamic gas injection to maintain this dispersed state.
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 resulting carbon nanotubes exhibit excellent electrical conductivity, fluidity, and appearance characteristics when used in composite materials, enhancing their molding efficiency and reducing pinholes.
Implementation Method 1
Carbon nanotubes with a number average particle size of 40 to 120 μm and a bulk density of 25 kg/m3 or less are produced using a fluidized bed reactor equipped with a side nozzle, which prevents aggregate formation by injecting additional gas through the nozzle
Data Source
AI summary
Low-density carbon nanotubes may be prepared using a fluidized bed reactor provided with a side nozzle, and are excellent in electrical properties and appearance characteristics when used as a composite material.