Flexible Underwater Pipe Sealing Layer Using Surface-Modified Titanium Dioxide Nanoparticles
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Solution Overview
Problem
Flexible underwater pipes used for transporting hydrocarbons at high pressures and temperatures face issues with creep resistance in their polymeric sealing layers, leading to potential local cracking and reduced flexibility due to viscoelastic flow of polymer chains, which existing solutions like anti-creep devices and sacrificial layers fail to adequately address.
Innovation Solution
Incorporating surface-modified titanium dioxide nanoparticles chemically bonded to the polymer resin within the pipe's inner sealing layer, utilizing covalent and/or hydrogen bonds to reduce polymer chain mobility and enhance compressive creep resistance, while maintaining mechanical properties and reducing material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymer resins are used in the inner sealing layer, then the pipe can be manufactured with standard materials and processes, but the polymer exhibits poor creep resistance under high temperature and pressure conditions
Solution Approach 1:
The patent applies composite materials by incorporating titanium dioxide nanoparticles into the polymer resin matrix to create a nanocomposite sealing layer. This composite structure combines the flexibility and chemical stability of the polymer with the high creep resistance and mechanical strength of titanium dioxide nanoparticles, resolving the contradiction between reliability under stress and overall mechanical strength.
Solution Approach 2:
The patent changes the physical and chemical parameters of the polymer resin by adding surface-modified titanium dioxide nanoparticles. This modification alters the polymer's viscoelastic properties, significantly reducing creep behavior under high temperature and pressure while maintaining or enhancing tensile strength and flexibility through optimized nanoparticle dispersion and surface treatment.
2Strength
If fillers are added to improve mechanical properties, then tensile and bending strength increase, but the desired improvement in creep resistance and compressive strength is not achieved
Solution Approach 1:
The patent changes the critical parameters of creep resistance by selecting titanium dioxide nanoparticles with specific surface modifications that interact strongly with the polymer chains. This targeted parameter change addresses compressive creep resistance specifically, which conventional fillers fail to improve, while simultaneously maintaining tensile and bending strength through optimized nanoparticle-polymer interfaces.
Solution Approach 2:
The patent applies local quality by concentrating surface-modified titanium dioxide nanoparticles at strategic locations within the polymer matrix where stress concentration occurs during creep. The surface modification creates localized strong interactions between nanoparticles and polymer chains, providing enhanced creep resistance in critical regions while preserving overall mechanical properties.
3Reliability
If the polymer chain mobility is reduced to improve creep resistance, then high temperature and pressure resistance improves, but the flexibility and ductility of the polymer may be compromised
Solution Approach 1:
The patent optimizes the parameters of nanoparticle surface modification to achieve a balance between reducing polymer chain mobility for creep resistance and maintaining flexibility. The surface treatment creates controlled interaction zones that restrict creep-related chain movement while allowing flexibility-preserving chain segments to remain mobile, achieving both high temperature/pressure resistance and operational flexibility.
Solution Approach 2:
The patent applies local quality by creating zones of restricted polymer chain mobility around surface-modified titanium dioxide nanoparticles while maintaining mobility in other regions of the polymer matrix. This localized approach reduces overall creep behavior through nanoparticle-polymer interactions while preserving the bulk material's flexibility and ductility for ease of operation.
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 use of surface-modified titanium dioxide nanoparticles significantly improves the creep resistance of the polymer resin, reducing deformation and maintaining mechanical strength, flexibility, and reducing material costs, thereby ensuring reliable high-pressure and high-temperature fluid transport.
Implementation Method 1
surface-modified titanium dioxide nanoparticles chemically bonded to the polymer resin within the pipe's inner sealing layer, utilizing covalent and/or hydrogen bonds to reduce polymer chain mobility
Implementation Method 2
surface-modified titanium dioxide nanoparticles chemically bonded to the polymer resin within the pipe's inner sealing layer, utilizing covalent and/or hydrogen bonds to reduce polymer chain mobility
Implementation Method 3
Creep occurs in any part in polymer subjected to stress. The cause is the viscoelastic flow of the polymer over time due to the mobility of the polymer chains relative to each other.
Data Source
AI summary
The disclosure relates to a flexible underwater pipe intended for transporting fluids, in particular hydrocarbons, comprising at least one layer comprising a polymer resin comprising surface-modified titanium dioxide nanoparticles bonded to the polymer by a covalent and/or hydrogen bond.