Crosslinked Silane Cable Layer Flame Retardancy
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Solution Overview
Problem
Current methods for producing crosslinked silane layers in cables, particularly those with flame-retardant fillers, often compromise mechanical properties such as elongation at break and tensile strength, while maintaining flame retardancy.
Innovation Solution
A cable design incorporating a crosslinked silane layer composed of a mixture of two silane grafted polymers, a flame retardant filler, and a distinct flame retardant agent, which enhances mechanical properties like elongation at break and tensile strength while ensuring non-propagation of fire, utilizing a composition that can be easily extruded at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flame-retardant fillers are incorporated into the crosslinked layer, then flame retardant properties are improved, but mechanical properties such as elongation at break and tensile strength deteriorate
Solution Approach 1:
The patent uses a composite material system consisting of silane-grafted polyethylene combined with specific flame-retardant fillers (aluminum trihydroxide, magnesium dihydroxide) and coupling agents. This composite approach allows the flame-retardant fillers to be effectively integrated into the polymer matrix, maintaining mechanical properties while achieving excellent flame retardancy. The coupling agent acts as an interface enhancer between the filler and polymer, preventing property deterioration.
Solution Approach 2:
The patent optimizes the proportions of different components in the composition, specifically controlling the ratio of silane-grafted polyethylene to flame-retardant fillers and incorporating specific amounts of coupling agents. By adjusting these compositional parameters, the patent achieves a balance where flame retardant properties are maximized while mechanical strength and elongation are maintained above acceptable thresholds.
2Reliability
If significant quantity of flame-retardant filler is added, then flame retardancy is improved, but dielectric and rheological properties are negatively impacted
Solution Approach 1:
The patent introduces coupling agents as intermediary substances that mediate between the flame-retardant fillers and the silane-grafted polyethylene matrix. These coupling agents improve the interfacial adhesion and dispersion of fillers, reducing their negative impact on dielectric and rheological properties while maintaining effective flame retardancy. The coupling agent acts as a bridge that minimizes the harmful effects of filler incorporation.
3Strength
If crosslinked layer is designed for high mechanical properties, then elongation at break and tensile strength are improved, but flame retardant properties may be compromised
Solution Approach 1:
The patent employs a multi-functional composition where silane-grafted polyethylene provides both mechanical strength and crosslinking capability, while flame-retardant fillers provide fire protection. The coupling agent simultaneously improves filler dispersion and interfacial adhesion. This multi-functional approach ensures that enhancing mechanical properties does not compromise flame retardancy, as each component contributes to multiple performance aspects.
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 achieves improved mechanical properties like elongation at break and tensile strength, while maintaining excellent flame retardancy, as demonstrated by specific standards, and allows for high-speed extrusion of the crosslinked silane layer.
Implementation Method 1
a crosslinked silane layer obtained from a charged composition comprising: a first silane grafted polymer, a second silane grafted polymer, at least one flame retardant filler, and at least one flame retardant agent
Data Source
AI summary
The present invention relates to a cable comprising an elongated conductive element surrounded by at least one silane cross-linked layer obtained from a filled composition comprising a first silane grafted polymer, a second silane grafted polymer, at least one flame-retardant filler, and at least one flame-retardant agent.