HFFR Polymeric Composition for Flexible Crack-Resistant Cable Jackets
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Solution Overview
Problem
Traditional polyolefin-based halogen-free flame retardant (HFFR) cable jacket compositions require high filler loadings, leading to increased density, reduced flexibility, and compromised mechanical properties, making them unsuitable for non-traditional applications where environmental stress cracking resistance and wide temperature fluctuations are critical.
Innovation Solution
A polymeric composition comprising a polyolefin elastomer, polypropylene-based polymer, crystalline block composite, and maleated polyolefin elastomer, with a HFFR filler content of 40 wt% or greater, effectively compatibilized using a maleic anhydride grafted compatibilizer, enhancing mechanical properties like elongation at break, tensile strength, and environmental stress cracking resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high filler loadings (60-65 wt%) are used to achieve flame retardancy, then flame retardant performance is improved, but mechanical properties (elongation at break, tensile strength) and flexibility deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the polymer phase by incorporating specific elastomeric polymers (ethylene-propylene-diene copolymer, ethylene-vinyl acetate copolymer) and precise compatibilizer ratios (5-15 wt% of total composition), transforming the material properties to achieve both flame retardancy and mechanical performance
Solution Approach 2:
The patent creates a composite material system combining polyolefin matrix, elastomeric polymer phase (10-30 wt%), hydrated mineral filler (60-65 wt%), and compatibilizer components, where the synergistic interaction between components achieves both flame retardant performance and improved mechanical properties
2Reliability
If high filler loadings (60-65 wt%) are used to achieve flame retardancy, then flame retardant performance is improved, but density increases and flexibility decreases
Solution Approach 1:
The patent modifies the physical parameters of the composition by controlling the polymer phase composition (incorporating elastomeric components) and compatibilizer content (5-15 wt%), which changes the material's flexibility and processability despite high filler loading
Solution Approach 2:
The compatibilizer acts as an intermediary substance that improves the interface between the polymer phase and hydrated mineral filler, enabling better stress transfer and maintaining flexibility even with 60-65 wt% filler content
3Stability of the object's composition
If conventional compatibilization approaches are used (targeting polymer-filler interface), then filler adhesion is improved, but environmental stress cracking resistance remains insufficient for non-traditional applications
Solution Approach 1:
The patent changes the chemical parameters of the polymer phase by selecting specific elastomeric polymers and compatibilizer types (maleic anhydride grafted polyethylene, ethylene-propylene-diene copolymer), which simultaneously improve filler adhesion and environmental stress cracking resistance
Solution Approach 2:
The patent creates a multi-phase composite material system where the elastomeric polymer phase (10-30 wt%) and compatibilizer work synergistically to provide both good filler dispersion/adhesion and enhanced environmental stress cracking resistance, enabling non-traditional applications
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 an ESCR of greater than 1000 hours, a hot knife indentation of less than 50%, and an elongation at break of greater than 70% with a tensile strength of 10 Mpa or greater, enabling HFFR cable jackets for diverse applications beyond conventional uses.
Implementation Method 1
maleic anhydride grafted compatibilizer to couple the HFFR and the olefin multi-block interpolymer together
Implementation Method 2
The decomposition of the hydrated mineral filler releases water thereby removing heat from the fire source
Implementation Method 3
hydrated mineral fillers that dilute the concentration of flammable polymer material and decompose below the degradation temperature of the polymer when exposed to heat
Data Source
AI summary
A polymeric composition including in weight percent of the polymeric composition: (a) 10 wt% to 30 wt% of a polyolefin elastomer; (b) 1 wt% to 20 wt% of a polypropylene-based polymer; (c) greater than 1 wt% to 20 wt% of a crystalline block composite; (d) 1 wt% to 10 wt% of a maleated polyolefin elastomer; and (e) 40 wt% to 80 wt% of a halogen free flame-retardant filler.