Pitch Composition With Low-Temperature Oxidative Stabilization
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Solution Overview
Problem
The high cost of carbon fibers limits their widespread use despite their remarkable properties, and there is a need for low-cost technologies that can optimize the stabilization process during carbon fiber production.
Innovation Solution
Developing pitch compositions with a softening point temperature (Tsp) of 400°C or less and an oxidation onset temperature (OOT) at least 10°C below Tsp, allowing for improved stabilization and production of high-quality carbon fibers through controlled heating and spinning processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional pitch compositions are used for carbon fiber production, then the stabilization process requires high temperatures and extended times, but this increases production cost and reduces efficiency
Solution Approach 1:
The patent modifies the chemical composition parameters of the pitch, specifically incorporating reactive mesogenic compounds with controlled molecular weight and functional groups. This changes the reactivity and thermal behavior parameters, allowing stabilization to proceed at lower temperatures and shorter times while maintaining fiber quality
Solution Approach 2:
The patent creates a composite pitch composition by combining reactive mesogenic compounds with conventional pitch components. This composite structure provides both the desired fiber-forming properties and enhanced reactivity for improved stabilization kinetics, reducing processing costs and time
2Ease of operation
If pitch with low softening point is used to enable melt spinning, then spinning becomes easier, but the pitch may degrade before stabilization can occur
Solution Approach 1:
The patent adjusts the molecular weight distribution and functional group composition of the pitch to achieve an optimal balance between softening point and thermal stability. The reactive mesogenic compounds provide early-stage reactivity at lower temperatures while the overall composition maintains stability throughout the processing window
Solution Approach 2:
The patent incorporates pre-reactive functional groups in the pitch composition that initiate stabilization reactions before and during the spinning process. This preliminary chemical action ensures that the pitch begins crosslinking immediately upon exposure to air, preventing degradation even at low softening points
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 proposed pitch compositions enhance stabilization, tensile strength, and tensile modulus, enabling the production of higher quality carbon fibers at a lower cost, suitable for various industrial applications.
Implementation Method 1
an oxidation onset temperature (OOT) at least 10° C. below the Tsp
Implementation Method 2
the pitch is heated to sufficiently high temperatures to melt the pitch and reduce its viscosity
Implementation Method 3
heated to sufficiently high temperatures to melt the pitch
Data Source
AI summary
A pitch composition suitable for spinning may comprise: a pitch having a softening point temperature (Tsp) of 400° C. or less, and an oxidation onset temperature (OOT) at least 10° C. below the Tsp at a ramp rate of 10° C./min. A carbon fiber may comprise: a carbon fiber produced from a pitch composition, wherein the pitch composition comprises: a pitch having a softening point temperature (Tsp) of 400° C. or less, and an oxidation onset temperature (OOT) at least 10° C. below the Tsp at a ramp rate of 10° C./min.