Halogen-Free Flame Retardant Elastomer Insulation Resistance
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Solution Overview
Problem
Current wire and cable insulation materials, particularly PVC, face challenges in providing high temperature resistance, hydrolysis resistance, and flame retardancy while maintaining mechanical and electrical properties, and there is a need for halogen-free alternatives that are environmentally friendly.
Innovation Solution
The development of flame retardant polymer compositions comprising copolyetherester thermoplastic elastomers, melamine cyanurate, epoxy-containing compounds, and optionally phosphites or aromatic phosphate esters, which provide a balance of mechanical performance, flame retardance, and electrical insulation resistance under various conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If halogen-free flame retardant additives are used to replace PVC, then environmental friendliness and flame retardancy are improved, but electrical insulation resistance deteriorates
Solution Approach 1:
Epoxy-containing compounds are introduced as intermediary substances that react with halogen-free flame retardant additives to form a protective interface layer. This intermediary layer prevents direct contact between the flame retardant additives and the polymer matrix, reducing their negative impact on electrical insulation while maintaining flame retardant effectiveness through the synergistic action of melamine cyanurate and phosphorus compounds.
Solution Approach 2:
The patent employs a composite flame retardant system combining multiple halogen-free additives (melamine cyanurate, phosphorus compounds, metal hydroxides) with epoxy-containing compounds. This composite approach creates a multi-functional system where each component contributes different properties: flame retardancy from the traditional additives and improved electrical insulation from the epoxy compounds that form a protective barrier.
2Object-affected harmful factors
If high levels of flame retardant additives are incorporated, then flame retardancy is improved, but mechanical properties and electrical insulation deteriorate
Solution Approach 1:
Epoxy-containing compounds serve as intermediary agents that compatibilize the interface between flame retardant additives and the copolyetherester elastomer matrix. This intermediary作用 reduces stress concentration at the additive-polymer interface, preventing premature failure and maintaining mechanical integrity even at high flame retardant loading levels.
Solution Approach 2:
The patent optimizes the chemical parameters of the flame retardant system by selecting specific epoxy-containing compounds with appropriate molecular weights and functional groups. This parameter optimization allows for higher additive loading while maintaining mechanical properties, as the optimized epoxy compounds provide better interfacial adhesion and stress distribution.
3Object-affected harmful factors
If halogen-free flame retardant compositions are developed, then environmental sustainability is improved, but electrical insulation resistance under humid conditions deteriorates
Solution Approach 1:
Epoxy-containing compounds form a hydrophobic intermediary barrier that protects the polymer matrix and flame retardant additives from moisture penetration. This protective interface layer prevents water molecules from reaching the additive-polymer interface, eliminating the hydrolysis reactions that would otherwise degrade electrical insulation properties in humid environments.
Solution Approach 2:
The epoxy-containing compounds create an inert protective environment around the flame retardant additives, shielding them from moisture and oxygen. This inert barrier prevents hydrolytic degradation and maintains the electrical insulation resistance of the composition under humid service conditions, while the halogen-free formulation maintains environmental sustainability.
Data Source
AI summary
Halogen-free flame retardant compositions comprising copolyetherester thermoplastic elastomers, melamine cyanurate and epoxy-containing compounds and cables and wires made from such flame retardant polymer composition provide good electrical insulation resistance during use.