Gas Seal Member Composition Using Single-Walled Carbon Nanotubes
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Solution Overview
Problem
Gas seal members used in high-pressure applications, such as underground resource mining and hydrogen stations, face issues with overflow fracture and blister fracture due to inadequate durability under high-pressure conditions, despite having good durability in high-temperature environments.
Innovation Solution
A composition for a gas seal member incorporating a fibrous carbon nanostructure with single-walled carbon nanotubes in a predetermined proportion relative to an elastomer, which suppresses both overflow and blister fractures by enhancing gas permeability and reinforcing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If multi-walled carbon nanotubes are used to improve high-temperature durability, then high-temperature resistance is improved, but high-pressure durability deteriorates
Solution Approach 1:
The patent changes the critical parameter from multi-walled carbon nanotubes to single-walled carbon nanotubes, and optimizes the concentration parameter to 0.1-12 parts by mass per 100 parts of elastomer. This parameter change resolves the contradiction by achieving both high-temperature durability (through the thermal stability of SWCNTs) and high-pressure durability (through the unique mechanical properties and gas permeability control of SWCNTs at optimized concentrations).
Solution Approach 2:
The patent creates a composite material system combining elastomer with single-walled carbon nanotubes. This composite approach allows the elastomer matrix to provide baseline high-temperature resistance while the SWCNTs contribute enhanced mechanical strength and controlled gas permeability, simultaneously addressing both high-temperature and high-pressure durability requirements.
2Reliability
If gas seal member is exposed to high-pressure gas, then sealing function is performed, but overflow fracture and blister fracture occur
Solution Approach 1:
The patent utilizes the porous structure introduced by single-walled carbon nanotubes at controlled concentrations (0.1-12 parts per 100 parts elastomer) to create a material that allows controlled gas permeation. This prevents gas accumulation that leads to blister fracture, while the SWCNT-reinforced matrix maintains sufficient strength to prevent overflow fracture under high-pressure sealing conditions.
Solution Approach 2:
By optimizing the SWCNT concentration parameter to 0.1-12 parts by mass per 100 parts of elastomer, the patent achieves the right balance between maintaining matrix integrity (for fracture resistance) and controlling gas permeability (to prevent blister formation), thereby resolving the contradiction between sealing function and fracture resistance.
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 effectively prevents overflow and blister fractures in gas seal members when exposed to high-pressure gases, ensuring sufficient durability and preventing gas leakage in high-pressure equipment.
Implementation Method 1
a fibrous carbon nanostructure including single-walled carbon nanotubes is contained in a predetermined proportion, a gas seal member capable of sufficiently suppressing both the occurrence of overflow fracture and the occurrence of blister fracture can be formed
Implementation Method 2
a composition for a gas seal member containing an elastomer and a fibrous carbon nanostructure, and the fibrous carbon nanostructure includes single-walled carbon nanotubes
Data Source
AI summary
Provided is a composition for a gas seal member that can form a gas seal member capable of sufficiently suppressing both the occurrence of overflow fracture and the occurrence of blister fracture. The disclosed composition for a gas seal member is a composition for a gas seal member that contains an elastomer and a fibrous carbon nanostructure. The fibrous carbon nanostructure includes single-walled carbon nanotubes and the fibrous carbon nanostructure is contained in a proportion of at least 0.1 parts by mass and no greater than 12 parts by mass per 100 parts by mass of elastomer.