Halogen-Free Flame Retardant Polymer Composition
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Solution Overview
Problem
Existing polymeric materials used in electrical wires and cables face challenges in achieving high flame retardancy without emitting hazardous gases, while maintaining superior mechanical properties and processability, especially with the use of halogen-free compositions.
Innovation Solution
A flame retardant polymer composition comprising an ethylene copolymer, a halogen-free mineral filler, and a maleic anhydride modified ethylene homo- or copolymer, which includes components like ethylene methacrylate copolymer, α-olefin comonomers, huntite, and hydromagnesite, allowing for excellent flame retardancy, mechanical properties, and efficient processing up to 235°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large amounts of inorganic fillers (50-60 wt%) are added to achieve high flame retardancy, then flame retardant properties are improved, but processability and mechanical properties deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the polymer matrix by introducing maleic anhydride modified ethylene copolymer and specific ethylene copolymers with controlled comonomer content. This modifies the polymer's interaction with fillers and improves processability without requiring excessive filler amounts, thus resolving the contradiction between flame retardancy and processability
Solution Approach 2:
The patent creates a composite material system combining specific polymeric components (ethylene copolymers, maleic anhydride modified copolymer) with halogen-free mineral fillers. The composite structure allows optimized filler dispersion and interaction, achieving good flame retardancy with reduced filler content compared to conventional formulations, thereby improving processability
2Reliability
If large amounts of inorganic fillers (50-60 wt%) are added to achieve high flame retardancy, then flame retardant properties are improved, but mechanical properties deteriorate
Solution Approach 1:
The patent develops a composite material where the polymeric matrix is specifically designed with maleic anhydride modified ethylene copolymer and ethylene copolymers. This composite structure provides better filler-matrix interfacial adhesion, allowing reduced filler content (avoiding 50-60 wt%) while maintaining both flame retardancy and mechanical strength
Solution Approach 2:
The patent modifies the chemical parameters of the polymer matrix through maleic anhydride grafting and copolymer composition control. These parameter changes enhance the polymer's ability to bond with mineral fillers, reducing the need for excessive filler loading and thereby preserving mechanical properties while achieving flame retardancy
3Reliability
If halogen-containing compounds are added to improve flame retardancy, then flame retardant properties are improved, but harmful gas emission increases
Solution Approach 1:
The patent converts the traditional approach by using halogen-free mineral fillers that decompose endothermically to release inert gases (CO2, H2O) instead of harmful halogen gases. The fillers (hydroxycarbonates like hydromagnesite and huntite) provide flame retardancy through a beneficial mechanism that eliminates harmful emissions
Solution Approach 2:
The patent creates an inert fire suppression environment by using mineral fillers that release non-toxic gases (CO2, H2O vapor) during decomposition. These inert gases displace oxygen and suppress combustion without producing harmful emissions, thus achieving flame retardancy with clean gas emission profile
4Ease of manufacture
If the composition is processed at high temperature to improve processability, then processability is improved, but decomposition of flame retardant filler may occur
Solution Approach 1:
The patent changes the chemical composition of the polymer matrix to include maleic anhydride modified ethylene copolymer and specific ethylene copolymers. This composition modification improves the polymer's flow and processing characteristics at lower temperatures, allowing effective processing without exceeding the thermal stability range of the flame retardant fillers
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 achieves excellent flame retardancy with minimal harmful gas emission, superior mechanical properties, and improved processability, meeting stringent safety standards and reducing production costs.
Implementation Method 1
Such fillers, which include Al(OH)3 and Mg(OH)2 decomposes endothermically at temperatures between 200 and 600°C, liberating inert gases
Data Source
AI summary
The present invention relates to a flame retardant polymer composition comprising an ethylene copolymer comprising polar groups selected from the group consisting of acrylic acids, methacrylic acids, acrylates, methacrylates, acetates and vinyl acetates; a single site catalyst prepared ethylene copolymer having a density between 0.860 and 0.910 g/cm3; a halogen-free mineral filler comprising a huntite and/or a hydromagnesite and a maleic anhydride modified ethylene homo- or copolymer (D). The present invention relates to a wire or cable comprising said flame retardant polymer composition, and to the use of said composition for the production of a layer, preferably a jacketing layer of a wire or cable.