Halogen-Free Polyphenylene Ether Cable Insulation Flame Retardance
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Solution Overview
Problem
The need for halogen-free, flame-retardant cable insulation and jacketing materials that meet stringent regional performance standards such as UL-62 in North America, HD21.14 in the European Community, and JCS 4509 in Japan, while maintaining the appearance, texture, and performance qualities of PVC, is unmet by existing materials.
Innovation Solution
A polymer composition comprising 10-40% poly(phenylene ether)-polysiloxane copolymer, 5-25% hydrogenated block copolymer, 0-10% polybutene, 30-60% surface-treated magnesium hydroxide, 0-10% anti-UV agent, and 1-40% copolymer of ethylene and alpha-olefin, which provides favorable color stability, flame retardance, and low smoke density when combusted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If halogen-free materials are used to replace PVC, then health and environmental performance is improved, but flame retardance and smoke density performance deteriorates
Solution Approach 1:
The patent uses a composite material system consisting of poly(phenylene ether)-polysiloxane copolymer blended with polybutadiene-polyethylene-polybutadiene block copolymer and polybutene. This composite structure achieves both halogen-free composition and improved flame retardance by combining materials with complementary properties, where the poly(phenylene ether) provides structural integrity and the block copolymers provide flame retardant characteristics.
Solution Approach 2:
The patent modifies the chemical composition parameters by incorporating specific ratios of poly(phenylene ether)-polysiloxane copolymer (10-40 wt%), polybutadiene-polyethylene-polybutadiene block copolymer (60-80 wt%), and polybutene (0.1-5 wt%). These parameter changes optimize the balance between flame retardance, smoke density, and mechanical properties while maintaining halogen-free status.
2Reliability
If halogen-free flame-retardant materials are developed, then safety standards are improved, but appearance, texture and performance qualities deteriorate compared to PVC
Solution Approach 1:
The patent adjusts compositional parameters within specific ranges: poly(phenylene ether)-polysiloxane copolymer at 10-40 wt%, polybutadiene-polyethylene-polybutadiene block copolymer at 60-80 wt%, and polybutene at 0.1-5 wt%. These parameter optimizations ensure that the material achieves flame retardance while maintaining acceptable appearance and color stability.
Solution Approach 2:
The patent introduces polybutene as a specific additive component that locally enhances color stability and appearance properties within the composite system. This local quality adjustment allows the bulk material to provide flame retardance while the polybutene component specifically addresses appearance and texture requirements.
3Stability of the object's composition
If polyvinyl chloride (PVC) is used for cable insulation, then appearance and performance qualities are maintained, but health and environmental compliance deteriorates
Solution Approach 1:
The patent extracts and eliminates halogen-containing PVC components from the cable insulation material system. By removing the harmful halogen element entirely, the material achieves health and environmental compliance while the remaining poly(phenylene ether) and block copolymer components are engineered to provide equivalent appearance and performance qualities.
Solution Approach 2:
The patent changes the fundamental chemical composition parameters from PVC-based to halogen-free poly(phenylene ether) and block copolymer system. This parameter change maintains mechanical and aesthetic properties while eliminating the harmful environmental and health impacts associated with halogen-containing materials.
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 polymer composition achieves excellent flame retardance and low smoke density, meeting stringent regional performance standards while maintaining color stability and performance similar to PVC.
Implementation Method 1
high purity magnesium hydroxide that has been surface-treated with an amino polysiloxane
Data Source
AI summary
Disclosed are polymer compositions, comprising: (a) 10 to 40 weight percent of a poly(phenylene ether)-polysiloxane copolymer; (b) 5 to 25 weight percent of a hydrogenated block copolymer of an alkenyl aromatic compound and a conjugated diene; (c) 0 to 10 weight percent of a polybutene; (d) 30 to 60 weight percent of magnesium hydroxide; (e) 0 to 10 weight percent of an anti-UV agent; (f) 1 to 40 weight percent of a copolymer of ethylene and a C3-C12 alpha-olefin; and (g) 0 to 30 weight percent of a polyolefin homopolymer.