Lead-Free Water Barrier Composition for Submarine Power Cables
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Solution Overview
Problem
Submarine power cables face challenges with water ingress, damage from external marine objects, and fatigue due to wave motion, and traditional lead-based water-blocking layers pose environmental contamination risks.
Innovation Solution
A submarine power cable design featuring a water barrier layer composed of a base polymer with at least 50 wt % and graphene or graphite-based additives, providing low water permeability and electrical conductivity while eliminating the need for lead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lead-based water-blocking layer is used, then water ingress is prevented, but environmental contamination occurs and the structure becomes more complex
Solution Approach 1:
The patent changes the chemical composition parameters of the water barrier layer by incorporating graphene (0.05-10 wt%) and graphite nanoplatelets (0.05-10 wt%) into polymer matrices, replacing traditional lead-based materials while maintaining water barrier performance through nanocomposite formulation
Solution Approach 2:
The patent employs composite materials consisting of polymer bases (such as polyethylene, polypropylene, or PVC) combined with graphene and/or graphite nanoplatelets to create an environmentally friendly water barrier layer that eliminates lead contamination while preserving protective functions
2Reliability
If a lead-based water-blocking layer is used, then water ingress is prevented, but the device complexity and cost increase
Solution Approach 1:
The patent uses composite materials where graphene and graphite nanoplatelets are dispersed in polymer matrices to provide water barrier functionality in a single integrated layer, eliminating the need for complex multi-layer structures or additional protective layers required by traditional lead-based solutions
Solution Approach 2:
The patent optimizes the concentration parameters of graphene (0.05-10 wt%) and graphite nanoplatelets (0.05-10 wt%) to achieve effective water barrier performance at low additive levels, simplifying the overall cable structure while maintaining protective functions
3Reliability
If graphene and graphite nanoplatelets are added to the polymer composition, then electrical conductivity is improved, but the composition becomes more complex
Solution Approach 1:
The patent creates a nanocomposite material where graphene and graphite nanoplatelets are uniformly dispersed in polymer matrices at optimized concentrations (0.05-10 wt% each), providing enhanced electrical conductivity while maintaining composition simplicity through a single-phase formulation approach
Solution Approach 2:
The patent systematically varies the concentration parameters of conductive additives (graphene: 0.05-10 wt%, graphite nanoplatelets: 0.05-10 wt%) to optimize electrical conductivity, demonstrating that low levels of these nanomaterials suffice to achieve required conductive properties without excessive complexity
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 solution effectively prevents water ingress and meets the electrical, mechanical, and chemical requirements of submarine cables, offering a lead-free and cost-effective alternative to traditional solutions.
Implementation Method 1
an additive being graphene, graphene or graphite nanoplatelets, graphene oxide, reduced graphene oxide and/or graphite
Data Source
AI summary
A submarine power cable including: a conductor; an insulation system including at least a first semiconducting layer provided around the conductor, and an insulation layer provided around the first semiconducting layer; a water barrier layer surrounding the insulation system. The water barrier layer is obtained from a composition including a base polymer in an amount of at least 50 wt % and an additive being graphene, graphene or graphite nanoplatelets, graphene oxide, reduced graphene oxide and/or graphite in an amount of between 0.05 wt % and 10 wt %, preferably between 0.25 wt % and 6 wt %, more preferably between 0.5 wt % and 2 wt %, based on the weight of the composition.