Fluoropolymer Cable Sheathing Composition
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Solution Overview
Problem
Fluoropolymer compositions based on ETFE or ECTFE face challenges in maintaining corrosion resistance, flame retardancy, and thermal aging resistance while enhancing processability, flexibility, and bending ability for use in cable sheathing applications, particularly for electrical heating elements.
Innovation Solution
A fluoropolymer composition comprising a semi-crystalline polymer with recurring units derived from ethylene and chlorotrifluoroethylene or tetrafluoroethylene, combined with an ethylene copolymer having a long chain α-olefin, which allows for improved processing and flexibility while maintaining thermal resistance, characterized by a heat of fusion of at most 35 J/g and a density of less than 0.900 g/cm3.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ECTFE or ETFE polymers are used for cable sheathing, then corrosion resistance, flame retardancy and thermal ageing resistance are improved, but processability and flexibility deteriorate due to crystalline character and high melting points
Solution Approach 1:
The patent creates a composite material system by blending ECTFE or ETFE polymer (providing corrosion resistance, flame retardancy, and thermal ageing resistance) with a polyolefin matrix (improving processability). The polyolefin acts as a continuous phase that facilitates processing while the fluoropolymer dispersion maintains the protective properties, resolving the contradiction between reliability and ease of manufacture.
2Reliability
If ECTFE or ETFE polymers are used for cable sheathing, then corrosion resistance, flame retardancy and thermal ageing resistance are improved, but flexibility and bending ability deteriorate due to crystalline character and high melting points
Solution Approach 1:
The composite structure combines the rigid fluoropolymer particles (maintaining protective properties) within a flexible polyolefin continuous phase. This allows the material to maintain corrosion resistance and flame retardancy while the polyolefin matrix provides the necessary flexibility and bending ability for cable applications, resolving the contradiction between reliability and ease of operation.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the fluoropolymer system by controlling particle size, distribution, and concentration within the polyolefin matrix. These parameter changes allow the material to transition from a highly crystalline, rigid state to a more flexible composite structure that maintains protective properties while improving flexibility and bending ability.
3Strength
If polyolefin/ECTFE or ETFE compositions are used for cable sheathing, then mechanical properties are improved, but homogeneous material properties throughout the material are compromised
Solution Approach 1:
The patent applies local quality by creating a heterogeneous structure where the polyolefin forms a continuous matrix phase and the fluoropolymer exists as dispersed particles. This local differentiation allows the continuous phase to provide mechanical strength and flexibility while the dispersed fluoropolymer particles maintain homogeneous distribution of protective properties such as corrosion resistance and flame retardancy throughout the material.
Solution Approach 2:
The composite structure with optimized phase distribution resolves the contradiction between strength and compositional homogeneity. The polyolefin- fluoropolymer composite achieves enhanced mechanical properties through the polyolefin matrix while maintaining homogeneous material properties through uniform dispersion of fluoropolymer particles throughout the continuous phase.
Data Source
AI summary
The invention pertains to a fluoropolymer composition [composition (C)] comprising:—at least one semi-crystalline polymer comprising recurring units derived from ethylene and at least one of chlorotrifluoroethylene (CTFE) and tetrafluoroethylene (TFE), said polymer having a heat of fusion of at most 35 J/g [polymer (A)]; and—from 0.05 to 15% by weight, based on weight of polymer (A), of at least one ethylene copolymer with at least one long chain a-olefin having a number of carbon atoms of 6 or more, and possessing a density of less than 0.900 g/cm3, as determined according to ASTM D792; to a method for its manufacture and to its use for manufacturing cables.