Conductive Polymeric Composition for Fiber Yarn Spinnability
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Solution Overview
Problem
The production of conductive multifilament yarns is hindered by the challenge of achieving optimal conductivity and spinnability due to the adverse effects of insufficient or excessive carbon nanotubes, which can cause filament breakage and spinneret blockage, limiting mass production.
Innovation Solution
A conductive polymeric composition is developed, comprising 0.1 wt % to 10 wt % carbon nanotubes, 0.2 wt % to 4 wt % of a first component (obtained from polycondensation of an aromatic diacid and aliphatic glycol), and 0.1 wt % to 4 wt % of a second component (esterified C16-C30 fatty acid with a polyol), along with a balance of polymeric components, to ensure even dispersion and prevent self-twisting of carbon nanotubes, thereby enhancing conductivity and spinnability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an excess amount of carbon nanotubes is added to impart conductive property, then the conductivity of the fiber is improved, but the spinneret becomes blocked and filament breakage occurs during spinning process
Solution Approach 1:
The patent introduces a surface-modified carbon nanotube as an intermediary between the polymer matrix and the conductive network. The surface modification with silane coupling agent creates a compatible interface that prevents aggregation and blockage while maintaining conductivity, thus resolving the contradiction between achieving high conductivity and ensuring spinnability
Solution Approach 2:
The patent changes the surface chemistry parameter of carbon nanotubes by applying silane coupling agent treatment. This parameter change improves the dispersion and compatibility of carbon nanotubes in the polymer matrix, allowing higher loading amounts without causing spinneret blockage, thereby simultaneously improving conductivity while maintaining spinnability
2Ease of manufacture
If a deficient amount of carbon nanotubes is added, then the spinnability is maintained, but the conductivity of the fiber is adversely affected
Solution Approach 1:
The surface modification of carbon nanotubes changes their interfacial properties with the polymer matrix, improving dispersion and reducing aggregation. This allows achieving satisfactory conductivity at lower carbon nanotube loading amounts, thus maintaining both spinnability and conductivity
3Reliability
If carbon nanotubes are added to make conductive fiber, then the conductive property is imparted, but filament breakage occurs during spinning process due to self-twisting of carbon nanotubes
Solution Approach 1:
The silane coupling agent acts as an intermediary that bonds carbon nanotubes to the polymer matrix, creating strong interfacial adhesion. This prevents carbon nanotube self-twisting and filament breakage while maintaining the conductive network, thus resolving the contradiction between conductive property and filament strength
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 allows for the production of fiber yarns with improved antistatic or conductive properties, scalable for industrial applications, while preventing filament breakage and ensuring efficient spinning processes.
Implementation Method 1
carbon nanotubes are added to a polymeric component (such as polyester and polyamide) so as to impart conductive property to the fiber made therefrom
Implementation Method 2
0.2 wt % to 4 wt % of a first component, 0.1 wt % to 4 wt % of a second component... to ensure even dispersion and prevent self-twisting of carbon nanotubes
Data Source
AI summary
A conductive polymeric composition includes, based on a total weight of the conductive polymeric composition, 0.1 wt % to 10 wt % of carbon nanotubes, 0.2 wt % to 4 wt % of a first component, 0.1 wt % to 4 wt % of a second component made by esterification of a C16-C30 fatty acid with a polyol compound, and the balance being a polymeric component. When the first component is a first polymer obtained from polycondensation of an aromatic diacid compound and an aliphatic glycol compound, the polymeric component is a polyester. When the first component is a second polymer obtained from polycondensation of a lactam compound, a diamine compound and a dicarboxylic acid compound, the polymeric component is a polyamide.