Halogen-Free Wire Insulation via Magnesium Hydroxide
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Solution Overview
Problem
There is a need for polymer composite materials used in wire and cable applications that are substantially free of halogen-containing compounds while maintaining flame retardant and physical attributes, as halogen-based materials can produce corrosive, toxic gases and dense smoke during fires.
Innovation Solution
The development of halogen-free polymer composites comprising a blend of ethylene/α-olefin copolymer, polyethylene, magnesium hydroxide as a hydrated metal oxide flame retardant, and an antimony compound, which can be crosslinked using conventional methods such as moisture-cure, free radical cure, or irradiation, to provide effective flame retardancy and physical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halogen-containing materials are used for wire and cable insulation and sheathing, then flame retardant performance is improved, but toxic gas and smoke generation increases during fire
Solution Approach 1:
The patent removes halogen-containing materials from the polymer composition entirely, extracting the harmful element while maintaining flame retardant performance through alternative mechanisms using halogen-free polymers combined with metal hydroxide flame retardants
Solution Approach 2:
The patent creates a composite material system combining halogen-free polymers (such as polyolefins, polyamides, or their blends) with inorganic flame retardants (metal hydroxides like magnesium hydroxide or aluminum hydroxide), forming a composite that achieves both flame retardancy and low smoke emission properties
2Object-generated harmful factors
If halogen-free polymer composites are developed, then environmental and corrosive impact is reduced, but maintaining flame retardant and physical attributes becomes more difficult
Solution Approach 1:
The patent modifies the chemical composition parameters by selecting specific halogen-free polymer types (polyolefins, polyamides, or their blends) and combining them with specific ratios of inorganic flame retardants, changing the material parameters to achieve both environmental友好性 and flame retardant performance
Solution Approach 2:
The patent develops composite materials that integrate halogen-free polymers with inorganic flame retardants, creating a synergistic system where the polymer matrix provides physical attributes and the inorganic additives provide flame retardancy, thus maintaining both sets of requirements
3Object-generated harmful factors
If polymer composite materials are formulated without halogen-containing compounds, then smoke and toxic gas generation is reduced, but achieving necessary flame retardant performance becomes challenging
Solution Approach 1:
The patent converts the potential disadvantage of halogen-free materials (which traditionally had poorer flame retardancy) into a benefit by using the decomposition behavior of metal hydroxides that release water vapor during heating, creating a cooling effect and forming protective char layers that enhance flame retardant performance while reducing smoke and toxic gas
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 halogen-free polymer composites exhibit excellent electrical and physical properties, including reduced smoke and toxic gas emission during fires, while meeting the necessary flame retardant and mechanical requirements for wire and cable sheathing materials.
Implementation Method 1
hydrated metal oxide flame-retardant, such as a magnesium, calcium, zinc and/or aluminum hydroxide
Implementation Method 2
The present composites may be designed to be crosslinked by a conventional method known to those of skill in the art. Common crosslinking methods include moisture-cure methods
Implementation Method 3
free radical cure methods
Implementation Method 4
irradiation based methods (e.g., electron beam methods)
Data Source
AI summary
Halogen-free polymer composite materials, which are commonly for use in sheathing and insulation applications for wire and cable, are provided. The composite materials include a polymeric blend, which includes ethylene/α-olefin copolymer and polyolefin, a hydrated metal oxide flame-retardant, such as hydrated magnesium oxide, and an antimony compound. In some instances, the polymeric blend may include an olefin/unsaturated ester copolymer.