Halogen-Free Fire Retardant Cable Composition
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Solution Overview
Problem
Conventional fire retardant cables that meet stringent fire resistance standards often rely on halogenated or heavy metal compounds, which are toxic and costly, and struggle to balance mechanical and electrical properties.
Innovation Solution
A halogen-free and heavy metal-free fire retardant composition comprising an ethylene vinyl acetate copolymer or silane-grafted ethylene copolymer, combined with metal hydroxide fillers and a fire retardant synergist like zinc borate or red phosphorus, which are crosslinked using continuous vulcanization or moisture cure processes to achieve compliance with UL VW-1, UL FV-1, and EN60332-1-2 Vertical Flame Propagation tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halogenated compounds or heavy metal compounds are included in cable insulation and jacket layers, then fire resistance standards are met, but toxicity and cost increase
Solution Approach 1:
The patent removes halogenated compounds and heavy metal compounds (such as antimony) from the cable insulation and jacket layer compositions, replacing them with halogen-free polymers and alternative flame retardant systems based on metal hydroxides and synergists, thereby eliminating toxicity while maintaining fire resistance performance
Solution Approach 2:
The patent develops composite material formulations combining halogen-free polymers (such as polyethylene, polypropylene, EVA) with metal hydroxide flame retardants (such as aluminum hydroxide, magnesium hydroxide) and synergistic compounds (such as zinc borate, titanium oxide), creating a multi-component system that achieves fire resistance without toxic halogenated or heavy metal compounds
2Reliability
If halogenated compounds or heavy metal compounds are included in cable insulation and jacket layers, then fire resistance standards are met, but cost increases
Solution Approach 1:
The patent replaces expensive halogenated compounds and heavy metal compounds with cost-effective alternatives based on abundant materials such as metal hydroxides (aluminum hydroxide, magnesium hydroxide) and synergistic compounds like zinc borate and titanium oxide, significantly reducing material costs while maintaining fire resistance performance
Solution Approach 2:
The patent creates composite formulations using readily available and inexpensive base polymers (polyethylene, polypropylene, EVA) combined with metal hydroxide flame retardants and synergistic compounds, forming a cost-effective multi-component system that achieves UL VW-1 and other fire resistance standards without requiring expensive halogenated or heavy metal compounds
3Reliability
If halogenated compounds or heavy metal compounds are included in cable insulation and jacket layers, then fire resistance is achieved, but difficulty in achieving multiple mechanical and electrical properties increases
Solution Approach 1:
The patent optimizes formulation parameters including polymer molecular weight, metal hydroxide particle size and distribution, synergist concentration, and crosslinking agent ratios to simultaneously achieve fire resistance, mechanical strength, elongation, and electrical insulation properties without the interference of halogenated or heavy metal compounds that complicate property balance
Solution Approach 2:
The patent develops integrated composite formulations where halogen-free polymers, metal hydroxide flame retardants, synergistic compounds, and crosslinking agents work together in a coordinated system, enabling simultaneous achievement of fire resistance (UL VW-1), mechanical properties (tensile strength, elongation), and electrical insulation properties through synergistic interactions among components
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 allows for the production of cables that pass stringent fire resistance tests while avoiding toxic materials, maintaining excellent mechanical and electrical properties, and simplifying sourcing by eliminating the need for different cable types for various markets.
Implementation Method 1
crosslinked using continuous vulcanization or moisture cure processes
Implementation Method 2
crosslinked using continuous vulcanization or moisture cure processes
Implementation Method 3
fire retardant synergist like zinc borate or red phosphorus
Data Source
Figure 1
AI summary
Fire retardant compositions including a base polymer, a fire retardant filler, and a fire retardant synergist are disclosed. The fire retardant compositions are halogen-free and heavy metal-free and can be crosslinked to form a cable insulation layer or a cable jacket. The cables can pass the UL VW-1 flame test. Cables having coverings formed from such fire retardant compositions are also described herein.