Semiconductive Resin Composition for Power Cable Peelability
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Solution Overview
Problem
Conventional semiconductive materials for power cables face issues with peelability, surface unevenness, irreproducibility, and increased thickness due to poor dispersibility of conductive particles, leading to inadequate electrical properties and recyclability.
Innovation Solution
A semiconductive resin composition incorporating 1-15 parts by weight of multiwalled carbon nanotubes and 1-10 parts by weight of an enhancer, based on a composite resin including 10-250 parts by weight of ethylene-(meth)acrylate-based resin and 1-100 parts by weight of olefinic elastomer, within a polypropylene-based resin framework, to enhance peelability, dispersibility, and surface smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional semiconductive materials (polyethylene crosslinked with carbon black) are used, then electrical conductivity is achieved, but peelability is insufficient and surface unevenness occurs
Solution Approach 1:
The patent changes the chemical composition parameters by replacing conventional carbon black with multiwalled carbon nanotubes (MWNTs) and adjusting the polymer matrix from polyethylene to polypropylene-based composite resin. This parameter change enables both good electrical conductivity and improved peelability, resolving the contradiction between maintaining electrical properties and achieving sufficient peelability for cable connection workability.
Solution Approach 2:
The invention uses a composite material system consisting of polypropylene-based resin, ethylene-(meth)acrylate-based resin, olefinic elastomer, and multiwalled carbon nanotubes. This composite approach combines the advantages of different materials: polypropylene provides peelability, carbon nanotubes provide conductivity with better dispersibility, and the elastomer component enhances flexibility and processing properties, thereby resolving the contradiction between conductivity and peelability.
2Reliability
If more conductive particles are used to improve conductivity, then electrical properties improve, but dispersibility decreases and aggregates form
Solution Approach 1:
The patent introduces an intermediary substance - olefinic elastomer - that acts as a dispersing agent between the conductive particles (carbon nanotubes) and the polymer matrix. This intermediary improves the dispersibility of carbon nanotubes, preventing aggregate formation while maintaining adequate electrical conductivity, thus resolving the contradiction between conductivity and dispersibility.
Solution Approach 2:
The invention changes the physical form parameter of conductive particles from conventional carbon black (amorphous powder) to multiwalled carbon nanotubes (structured cylindrical form). This parameter change in particle morphology provides better aspect ratio and surface area, improving dispersibility and reducing aggregation while maintaining electrical conductivity.
3Ease of manufacture
If conventional materials are used, then manufacturing is simple, but surface smoothness is poor and insulator thickness must be increased
Solution Approach 1:
The patent uses a composite resin system combining polypropylene, ethylene-(meth)acrylate-based resin, and olefinic elastomer. This composite material provides both ease of manufacture through standard extrusion processes and improved surface smoothness due to the synergistic effects of the polymer components and well-dispersed carbon nanotubes, eliminating the need for increased insulator thickness.
4Ease of operation
If polypropylene is used to improve peelability, then workability improves, but metal deactivation is insufficient without additional additives
Solution Approach 1:
The patent achieves multi-functionality where the polypropylene-based composite resin system simultaneously provides peelability for workability and inherent metal deactivation properties. The carbon nanotubes and elastomer components contribute to preventing metal deterioration, eliminating the need for separate metal deactivating additives while maintaining both peelability and metal protection functions.
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 improves peelability, reduces space charge accumulation, and maintains mechanical properties, allowing for thinner insulators, better workability, and recyclability, while preventing warping and aging caused by metal, thus enhancing the cable's performance and longevity.
Implementation Method 1
improve dispersibility of conductive particles to remove an aggregate
Implementation Method 2
multiwalled carbon nanotube as a conductive particle
Implementation Method 3
a metal deactivating additive for preventing deterioration by contact with a metal (conductor)
Implementation Method 4
improve peelability
Implementation Method 5
a product obtained by crosslinking a mixture of a polyolefin such as polyethylene
Data Source
AI summary
Provided is a semiconductive resin composition which may be used for both an internal semiconductive layer and an internal semiconductive layer of a power cable, and in particular has excellent peelability to be used for the external semiconductive layer. In addition, a novel semiconductive resin composition having improved thermal resistance and mechanical physical properties, and an improved deterioration property is provided. The semiconductive resin composition for a cable includes: 1 to 15 parts by weight of a multiwalled carbon nanotube as a conductive particle, and 1 to 10 parts by weight of an enhancer, based on 100 parts by weight of a composite resin including 10 to 250 parts by weight of an ethylene-(meth)acrylate-based resin and 1 to 100 parts by weight of an olefinic elastomer, based on 100 parts by weight of a polypropylene-based resin.