Silane-Crosslinkable Polyolefin Composition for Flexible Cable Strength
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Solution Overview
Problem
Current polyolefin compositions for wire and cable applications lack sufficient tensile strength and toughness while maintaining high flexibility, and their manufacturing processes are complex, requiring multiple crosslinking steps and specific conditions.
Innovation Solution
A crosslinkable polyolefin composition comprising 50-99 wt.% of ethylene copolymers with polar groups and hydrolysable silane groups, combined with 1-50 wt.% of a C3 to C8 alpha-olefin copolymer, which can be crosslinked using a silanol condensation catalyst, allowing for improved mechanical properties and simplified production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If silane crosslinkable LDPE is used for cable insulation, then the operation temperature can reach 90°C, but the flexural modulus is too high (170 MPa) and flexibility is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters by introducing polar groups (1-25 mol%) and controlling silane content (0.1-5 mol%), which fundamentally alters the material's physical properties to achieve both high temperature resistance and flexibility simultaneously
Solution Approach 2:
The patent creates a composite polymer system combining ethylene copolymer base with polar functional groups and silane crosslinking agents, forming a multi-component material that integrates the advantages of both high-temperature stability and flexibility
2Ease of operation
If EPR materials are used to achieve high flexibility (flexural modulus below 50 MPa), then the cable can be more flexible for certain applications, but the manufacturing process becomes very complicated requiring multiple crosslinking steps
Solution Approach 1:
The patent combines flexibility enhancement and crosslinking functionality into a single integrated material system, eliminating the need for separate crosslinking steps for insulation and jacket that are required in EPR-based solutions
Solution Approach 2:
The patent extracts the complex multi-step crosslinking process from the manufacturing workflow by incorporating all necessary crosslinking functionality directly into the extrusion process through the silane-containing polymer composition
3Ease of operation
If highly polar vinylsilane ethylene copolymers are used to achieve low flexural modulus (30 MPa or below), then the flexibility reaches EPR level, but the mechanical properties are below standard requirements
Solution Approach 1:
The patent optimizes the concentration parameters of polar groups (1-25 mol%) and silane content (0.1-5 mol%) to achieve the optimal balance between flexibility and mechanical strength, avoiding the weakness of highly polar copolymers while maintaining their flexibility advantage
Solution Approach 2:
The patent creates a composite structure within the polymer chain combining ethylene backbone with polar functional groups and silane crosslinking sites, producing a material that exhibits both the flexibility of polar copolymers and the mechanical strength of crosslinked networks
4Strength
If more rigid materials are used to ensure sufficient tensile strength and abrasion resistance, then the mechanical performance is improved, but the cable flexibility deteriorates
Solution Approach 1:
The patent modifies the chemical composition by incorporating polar groups and controlled silane content, which fundamentally changes the material's mechanical behavior to achieve both high strength and flexibility simultaneously, reversing the traditional strength-flexibility trade-off
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 achieves high tensile strength and flexibility, extending its application range for low voltage cables and simplifying the production process by enabling quicker crosslinking and compatibility with standard PVC/PE extrusion lines.
Implementation Method 1
monomer units with hydrolysable silane groups
Implementation Method 2
silanol condensation catalyst
Data Source
AI summary
The present invention relates to a crosslinkable polyolefin composition for wire and cable applications, and particularly for low voltage (LV) and medium voltage (MV) cables, to a cable comprising said compositions and to the use of said compositions for increasing the tensile strength and/or flexibility of a cable. The crosslinkable polyolefin composition of the invention comprises (a) 50 to 99 wt. %, based on the total polyolefin composition, of one or more ethylene copolymer(s) containing monomer units with polar groups and monomer units with hydrolysable silane groups, wherein the monomer units with polar groups are present in an amount of from 1 to 25 mol. % based on the total polyolefin composition, and (b) 1 to 50 wt. %, based on the total polyolefin composition, of a copolymer of ethylene and a C3 to C8 alpha-olefin co-monomer having a density of from 850 to 970 kg/m3 and a MFR2.16 of from 0.1 to 50 g/10 min. determined according to ISO 1133 at a temperature of 190° C. and a load of 2.16 kg. A cable comprising such a crosslinkable polyolefin composition and its use for increasing the tensile strength and/or flexibility of a cable are disclosed as well.