Vertical Reactor for Carbon Nanotube Fiber Spinning
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Solution Overview
Problem
Current methods for producing carbon nanotube fibers face challenges in achieving high-strength, long, and stable fibers due to short catalyst retention time in the furnace, leading to unsatisfactory physical properties and limited scalability.
Innovation Solution
An apparatus with a vertical reactor design where the spinning solution and carrier gas are introduced from the bottom, forming upward laminar flows to allow the catalyst to stay longer in the hot zone, enabling the production of continuous carbon nanotube fibers with enhanced mechanical and electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct spinning method is used with maximum spinning speed of 20-30 m/min, then productivity is improved, but catalyst retention time in furnace becomes too short to produce long stable fibers
Solution Approach 1:
The patent inverts the conventional direct spinning approach by introducing the spinning solution and carrier gas from the bottom of the furnace instead of the top, creating upward laminar flows that counteract gravity and extend catalyst retention time while maintaining high spinning speeds
Solution Approach 2:
The patent employs pneumatic control through carrier gas flow to create laminar flow patterns that trap and retain catalyst particles in the hot zone for extended periods, enabling both high productivity and long fiber production
2Quantity of substance
If coagulation spinning is used to increase carbon nanotube content to 60% by weight, then quantity of substance is improved, but physical properties of the fiber become unsatisfactory
Solution Approach 1:
The patent changes the processing parameters by using bottom-up spinning with laminar flows, which prevents the aggregation and misalignment issues that occur in coagulation spinning, thereby maintaining both high CNT content and excellent physical properties
Solution Approach 2:
The patent produces composite fibers with optimized CNT-polymer distribution through controlled laminar flow spinning, achieving superior mechanical properties compared to coagulation spinning while maintaining high CNT content
3Manufacturing precision
If liquid-crystalline spinning is used to produce well-aligned fibers, then manufacturing precision is improved, but spinning speed becomes very low and conditions are very strict
Solution Approach 1:
The patent inverts the conventional top-down approach by using bottom-up spinning, which naturally promotes fiber alignment through laminar flow while enabling much higher spinning speeds compared to liquid-crystalline spinning
Solution Approach 2:
The patent uses pneumatic laminar flow to achieve fiber alignment comparable to liquid-crystalline spinning but with significantly higher spinning speeds and more relaxed process conditions
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
This approach results in the production of long, strong, and highly elastic carbon nanotube fibers suitable for various applications, including composite materials, sensors, and electrochemical devices, with improved mechanical and electrical conductivity.
Implementation Method 1
forming upward laminar flows to allow the catalyst to stay longer in the hot zone
Implementation Method 2
the spinning solution entering the reaction zone through the spinning solution inlet is carbonized and graphitized
Implementation Method 3
the spinning solution entering the reaction zone through the spinning solution inlet is carbonized and graphitized
Implementation Method 4
a catalyst is allowed to stay in a furnace as long as possible
Data Source
AI summary
Provided is an apparatus for producing a carbon nanotube fiber. The apparatus includes: a vertical reactor having a reaction zone; an inlet through which a spinning solution is introduced into the bottom of the reaction zone of the reactor; an inlet through which a carrier gas is introduced into the bottom of the reaction zone of the reactor; heating means for heating the reaction zone; and a discharge unit disposed on the top of the reaction zone and through which a carbon nanotube fiber is discharged from the reactor. The spinning solution entering the reaction zone through the spinning solution inlet is carbonized and graphitized while ascending from the bottom of the reaction zone by the carrier gas entering through the carrier gas inlet, to form a carbon nanotube fiber consisting of continuous aggregates of carbon nanotubes. Further provided is a carbon nanotube fiber produced using the apparatus. The carbon nanotube fiber is long and exhibits high electrical conductivity, tensile strength, and elasticity. Due to these advantages, the carbon nanotube fiber is expected to find a variety of applications, including multifunctional composite materials, deformation/damage sensors, transmission cables, and electrochemical devices, for example, microelectrode materials for biological substance detection, supercapacitors, and actuators.