Sulphur-Crosslinked Polymer Composition for Fire Safety
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Solution Overview
Problem
Conventional flame-retardant elastomers compromise elastic properties when filled with high amounts of flame retardants, failing to meet fire safety standards like CEN TS 45545-2, especially under dynamic stresses, due to peroxide crosslinking systems that reduce elongation and increase crosslink density.
Innovation Solution
A sulphur-crosslinked polymer composition combining vinyl acetate and ethylene-propylene-diene rubber with high sulphur bond content, avoiding peroxide crosslinks, which maintains elastomeric properties and allows for high flame retardant filling without adverse effects on mechanical and dynamic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If peroxide crosslinking is used to achieve high crosslink density and improve mechanical strength, then compression set resistance improves, but ultimate elongation decreases and elastic properties are compromised
Solution Approach 1:
The patent changes the crosslinking chemistry from peroxide to sulphur-based systems, altering the chemical parameters to achieve different crosslink bond characteristics. This enables high crosslink density while maintaining longer crosslink bonds that preserve elastic properties and ultimate elongation.
Solution Approach 2:
The invention creates a composite crosslinking system combining sulphur crosslinks with specific polymer components (EVA, polyolefin, unsaturated elastomer) to achieve synergistic effects. The sulphur crosslinks provide compression set resistance while the polymer matrix maintains elasticity and dynamic properties.
2Object-affected harmful factors
If high amounts of flame retardants are added to achieve fire safety compliance, then flame resistance improves, but mechanical properties and elastic behavior deteriorate
Solution Approach 1:
The patent optimizes the sulphur content parameter (0.5-5 phr) and crosslinking conditions to achieve a balance where sufficient crosslink density is formed to maintain mechanical integrity even with high flame retardant loading (50-80 phr), while preserving elastic properties through the specific sulphur crosslink mechanism.
3Strength
If crosslink density is increased to improve mechanical indicators, then compression set resistance improves, but ultimate elongation decreases
Solution Approach 1:
The patent changes the crosslink bond length parameter by using sulphur-based crosslinking instead of peroxide, creating longer crosslink bonds that provide compression set resistance while maintaining chain mobility and ultimate elongation capability.
4Object-affected harmful factors
If flame retardants are mixed into elastomers to achieve fire safety, then flame resistance improves, but elastic properties are significantly reduced
Solution Approach 1:
The invention creates a composite system combining specific polymers (EVA, polyolefin, unsaturated elastomer) with sulphur crosslinking and flame retardants, where the sulphur crosslinks provide structural integrity while the polymer matrix and flame retardant combination preserves elastic properties even at high filler loads.
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 sulphur-crosslinked polymer composition achieves excellent fire safety with preserved dynamic and elastic properties, meeting stringent fire safety standards while maintaining material integrity under stress, even at elevated temperatures.
Implementation Method 1
The polymer mixture is not peroxidic; rather, it consists exclusively of a mixture matrix vulcanised by means of a sulphur crosslinking system or one containing sulphur, whereby the sulphur crosslinking system extends over the entire matrix and completely permeates or pervades the matrix
Implementation Method 2
The sulphur-crosslinked polymer composition achieves excellent fire safety with preserved dynamic and elastic properties, meeting stringent fire safety standards while maintaining material integrity under stress, even at elevated temperatures
Data Source
AI summary
The invention relates to a flame-proofed polymeric composition suitable for coating workpieces, containing a vinyl acetate-containing thermoplastic polymer and an unsaturated elastomer containing double bonds as polymeric components, wherein the polymeric components are present in the form of a homogeneous polymeric mixture, and a mixture matrix vulcanized exclusively by a sulphur or sulphur-containing crosslinking system is formed, wherein the sulphur crosslinking system extends across the entire matrix and permeates the matrix completely, and—at least one flame retardant or a combination of flame retardants. The invention further relates to articles produced therefrom, and to composite elements coated with this composition and to a method for producing the same.