Carbon Fiber Production from Poly(α(1→3) Glucan)
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Solution Overview
Problem
The carbon fiber market faces challenges due to high production costs and limited mechanical properties of conventional carbon fibers, which restrict their use in applications like the automotive industry, and there is a need for a more sustainable, cost-effective precursor source.
Innovation Solution
A process to produce high-strength, high-modulus carbon fibers from poly(α(1→3) glucan) filaments, involving tensioning, thermal stabilization, and carbonization steps, utilizing a biologically sourced precursor that reduces production costs and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyacrylonitrile precursor fibers are used for carbon fiber production, then the carbon fiber market is dominated by high-quality CFs, but the production cost is high and the precursor fiber cost accounts for 40-50% of total production cost
Solution Approach 1:
The patent replaces expensive polyacrylonitrile precursor fibers with cheaper polysaccharide-based precursor fibers (cellulose, starch, chitin, or their derivatives). These alternative precursors significantly reduce the raw material cost component (40-50% of total production cost) while maintaining the ability to produce high-quality carbon fibers through the same carbonization process
Solution Approach 2:
The patent modifies the chemical composition parameter of the precursor fiber by switching from synthetic polyacrylonitrile to natural polysaccharides. This parameter change enables cost reduction while the carbonization process parameters (temperature, atmosphere, time) are adjusted to maintain product quality
2Strength
If heating at high temperature (1000-3000°C) is applied during carbonization, then higher carbon content and Young's modulus are achieved, but the production cost and energy consumption increase
Solution Approach 1:
The patent optimizes the carbonization temperature parameter to achieve the desired mechanical properties with reduced energy input. By selecting appropriate precursor materials (polysaccharides) and adjusting the heating profile, the process achieves high carbon content and Young's modulus at lower temperatures compared to conventional high-temperature carbonization
Solution Approach 2:
The use of cheaper and more energy-efficient precursor materials (polysaccharides instead of polyacrylonitrile) allows for reduced energy consumption during carbonization while maintaining product performance
3Strength
If conventional carbon fiber production methods are used, then the mechanical properties meet basic requirements, but the cost and environmental impact limit expansion to industries like automotive
Solution Approach 1:
The patent employs inexpensive natural polysaccharides (cellulose, starch, chitin) as precursor materials, which are significantly cheaper than conventional polyacrylonitrile. This cost reduction enables competitive pricing that can enter markets such as automotive applications
Solution Approach 2:
The patent converts the environmental benefit of renewable, biodegradable polysaccharide materials into a competitive advantage. The use of sustainable precursors reduces environmental harm while maintaining cost-effectiveness, creating a dual benefit for both environment and market expansion
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 process yields carbon fibers with desired mechanical properties, reducing production costs and enabling broader industrial applications while utilizing a renewable, environmentally benign source.
Implementation Method 1
subjecting the thus tensioned one or more filaments to a first thermal exposure by heating said one or more filaments to a temperature in the range of 160 to 200° C. in air for a duration in the range of 5 to 15 minutes
Implementation Method 2
the organic polymer fiber is first heat-stabilized in air in an oxidation process conducted at a temperature of 200 to 400° C.
Implementation Method 3
The thus stabilized precursor fibers then undergo controlled pyrolysis, i.e., a carbonization step, comprising heat-treating in an inert atmosphere such as nitrogen to a temperature of from about 300° C. to about 3000° C., which removes non-carbon elements such as hydrogen, oxygen and nitrogen from the oxidized fiber
Implementation Method 4
subjecting said one or more stabilized filaments in a zero tension state to a third thermal exposure by heating said one or stabilized filaments to a temperature in the range of 700 to 1500° C. in an inert atmosphere for a duration in the range of 0.5 to 5 minutes, thereby preparing one or more carbonized filaments
Implementation Method 5
subjecting one or more filaments of poly(α(1→3) glucan) to a tension below the breaking strength of the one or more filaments at 350° C.; subjecting the thus tensioned one or more filaments to a first thermal exposure
Data Source
AI summary
A process is provided for preparation of carbon fibers based from fibers of poly(α(1→3) glucan). The method comprises three thermal exposures at progressively higher temperatures to drive off volatiles, thermally stabilize the glucan fiber, and carbonize the thermally stabilized fiber. The carbon fibers prepared according to the process hereof are strong, stiff, tough, and easily handled.