Flexible Elastomeric Foam Insulation via Polymer Blending
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Solution Overview
Problem
Current flexible elastomeric foams (FEFs) face limitations due to the dominance of nitrile butadiene rubber (NBR), which is expensive, has restricted availability, and poor fire performance, while ethylene diene (EPDM) based foams have worse insulation and water vapor properties, and both are challenging to blend with flame retardants. Additionally, styrene butadiene rubber (SBR) is not compatible with PVC, limiting its use in FEFs.
Innovation Solution
A blend of styrene substituted organic polymer and chlorinated organic polymer, mixed with physical or mechanical dispersion and fillers, along with halogenated compounds and inorganic fillers, to create a versatile, flame retardant FEF material with improved compatibility and processing tolerance, achieving high expandability and low thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If NBR is used as the polymer base for FEFs, then good mechanical properties and compatibility with PVC are achieved, but high cost and restricted availability occur
Solution Approach 1:
The patent replaces expensive NBR with cheaper alternative polymers (EPDM, SBR, or their copolymers) that can achieve similar or better performance. This substitution principle directly addresses the cost and availability issue while maintaining the required mechanical properties through optimized formulation and processing.
Solution Approach 2:
The patent uses composite material systems by combining different polymer bases (EPDM/SBR) with PVC and various additives (flame retardants, plasticizers, fillers) to create a blended composition that achieves the desired mechanical properties. This composite approach allows leveraging the cost advantages of alternative polymers while compensating for their individual shortcomings through synergistic combinations.
2Ease of manufacture
If NBR is used as the polymer base, then compatibility with PVC and good foaming process is achieved, but poor fire performance occurs
Solution Approach 1:
The patent introduces flame retardant additives as intermediary substances that mediate between the polymer matrix and fire exposure. These additives (such as halogenated compounds, phosphorus-containing compounds, or metal hydroxides) absorb or interrupt the fire propagation mechanism, thereby improving fire performance without disrupting the foaming process compatibility of the base polymers.
Solution Approach 2:
The patent modifies the chemical composition parameters of the polymer blend by incorporating specific ratios of flame retardants and adjusting the polymer base composition. This parameter change approach allows achieving adequate fire performance (meeting classification standards) while maintaining the foaming process compatibility through optimized formulation.
3Temperature
If EPDM is used as the polymer base, then higher temperature shielding capability is achieved, but worse insulation and water vapor properties occur
Solution Approach 1:
The patent applies local quality optimization by selecting different polymer bases for different application requirements. For standard temperature applications where excellent insulation and water vapor properties are critical, the patent uses SBR or NBR-based formulations. For higher temperature applications, EPDM is used, accepting the trade-off in insulation properties. This localized optimization allows each formulation to excel in its intended application range.
4Ease of manufacture
If SBR is used as the polymer base, then lower cost and better availability are achieved, but incompatibility with PVC occurs
Solution Approach 1:
The patent uses compatibilizer additives as intermediary substances that facilitate the mixing and compatibility between SBR and PVC. These compatibilizers (such as graft copolymers or specific plasticizers) act as bridges between the two immiscible polymers, enabling homogeneous blending and proper foaming process while maintaining the cost and availability advantages of SBR.
Solution Approach 2:
The patent creates a composite material system by combining SBR with PVC and compatibilizing agents in specific ratios. This composite formulation approach overcomes the inherent incompatibility between SBR and PVC by using synergistic combinations that enable proper mixing, foaming, and crosslinking while maintaining the economic benefits of SBR.
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 solution results in a reliable, economic, and easy-to-apply FEF material with enhanced flame retardancy, improved insulation properties, and compliance with modern regulations, without the need for critical chemicals like bromine or antimony, and provides effective thermal and sound insulation.
Implementation Method 1
erlosing gas bei der Zersetzung eines chemischen Ausdehnungsmittels
Implementation Method 2
durch Vernetzung mit Schwefel
Implementation Method 3
gemischt durch physikalische Dispersion
Implementation Method 4
oder mechanische Dispersion
Data Source
AI summary
The present invention relates to a material for thermal and/or acoustic insulation comprising an expanded elastomeric and/or thermoplastic elastomer blend based on styrenic organic polymer and chlorinated organic polymer, the process for the manufacturing of such material, and the use of such material.