Silane-Crosslinked MDH Polymer Composition With Zirconium Phosphate
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Solution Overview
Problem
Existing polymer compositions for wires and cables face challenges in achieving halogen-free, non-toxic flame retardancy while maintaining excellent processability and mechanical properties, particularly in meeting stringent safety and performance standards like UL44 and UL2556, with high mineral filler loadings leading to hygroscopicity and poor electrical performance.
Innovation Solution
A polymer composition comprising a cross-linkable olefin copolymer with hydrolysable silane groups, magnesium hydroxide, and zirconium phosphate, which allows for improved flame retardancy and mechanical properties without the use of toxic additives like antimony trioxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high amounts of inorganic fillers (50.0 to 60.0 wt.%) are added to achieve flame retardancy, then flame retardant properties are improved, but processability and mechanical properties deteriorate
Solution Approach 1:
The patent combines magnesium hydroxide (MDH) with zirconium phosphate (ZrP) to form a composite filler system. This composite approach allows the ZrP to act as a synergistic booster, enhancing the flame retardancy of MDH while enabling reduced overall filler loading. The composite structure creates a more efficient flame retardant system that maintains processability while achieving required fire safety performance.
Solution Approach 2:
The invention changes the compositional parameters of the filler system by introducing ZrP at specific loadings (1-10 wt.%) alongside MDH. This parameter modification transforms the filler system from a single-component high-loading approach to a multi-component optimized formulation, achieving flame retardancy with lower total filler content (40-60 wt.% vs. 50-60 wt.%), thereby improving processability.
2Reliability
If high amounts of inorganic fillers (50.0 to 60.0 wt.%) are added to achieve flame retardancy, then flame retardant properties are improved, but mechanical properties deteriorate
Solution Approach 1:
The composite filler system of MDH and ZrP creates a synergistic effect where ZrP enhances the flame retardancy efficiency of MDH. This allows reduction of total filler loading to 40-60 wt.%, which lessens the negative impact on the polymer matrix and preserves mechanical strength. The ZrP particles also improve the interfacial interaction between filler and polymer, helping maintain mechanical properties.
Solution Approach 2:
By modifying the filler composition parameters and introducing ZrP as a synergistic component, the invention achieves flame retardancy at optimized filler loadings. This parameter optimization reduces the excessive filler content that would otherwise compromise mechanical properties, maintaining a balance between fire safety and structural integrity.
3Reliability
If high amounts of inorganic fillers (50.0 to 60.0 wt.%) are added to achieve flame retardancy, then flame retardant properties are improved, but water absorption increases leading to poor electrical performance
Solution Approach 1:
The MDH-ZrP composite filler system addresses hygroscopicity issues by combining materials with complementary properties. ZrP has lower water absorption characteristics compared to pure MDH systems at equivalent flame retardancy levels. The composite structure reduces overall water uptake of the polymer composition, thereby maintaining better electrical performance during wet aging while achieving required flame retardancy.
Solution Approach 2:
The invention changes the filler composition parameters by incorporating ZrP, which modifies the overall hygroscopic behavior of the filler system. This parameter change reduces water absorption at the filler-polymer interface and within the filler structure itself, improving resistance to moisture-induced electrical degradation while maintaining flame safety.
4Strength
If antimony trioxide is added as a booster to reduce filler loading, then mechanical properties improve, but toxicity increases making it unsuitable for safe applications
Solution Approach 1:
The patent replaces the toxic but effective antimony trioxide booster with zirconium phosphate, which achieves similar or enhanced flame retardancy improvement without the toxicological concerns. ZrP is environmentally friendly, non-toxic, and provides sustained flame retardant performance, effectively substituting a harmful short-term solution with a safe long-term alternative.
Solution Approach 2:
The invention converts the challenge of achieving flame retardancy without toxic additives into a benefit by using ZrP, which not only provides safe flame retardancy but also improves mechanical properties and reduces water absorption. The non-toxic nature of ZrP transforms the limitation of avoiding antimony into a positive environmental and health safety feature of the composition.
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 combination of zirconium phosphate with magnesium hydroxide enhances flame retardancy and mechanical properties, meeting stringent safety standards while reducing filler loadings, thus improving processability and reducing hygroscopicity.
Implementation Method 1
the combination of zirconium phosphate (ZrP) with a conventional flame-retardant filler, in particular magnesium hydroxide (MDH), allows for the production of polymer compositions that simultaneously exhibit flame retardancy and good mechanical properties
Implementation Method 2
Such fillers, which include aluminium hydroxide (ATH) and magnesium hydroxide (MDH) decompose endothermically at temperatures between 200 and 600°C, liberating inert gases
Implementation Method 3
a cross-linkable olefin copolymer containing hydrolysable silane groups
Data Source
AI summary
A polymer composition comprising a cross-linkable olefin copolymer containing hydrolysable silane groups, magnesium hydroxide, and zirconium phosphate. A process for producing said polymer composition. An article, preferably a wire or cable, comprising said polymer composition. Use of zirconium phosphate in a polymer composition comprising magnesium hydroxide to improve flameretardancy.