Fire-Resistant Multi-Layer Membrane for Thermal Bonding Stability
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Solution Overview
Problem
Multi-layer membranes face delamination issues under severe weathering conditions, particularly at high temperatures, compromising their structural integrity and stability.
Innovation Solution
A multi-layer membrane design with a water-resistant polymeric layer bonded to a fire-resistant component, including a carrier layer with intumescent fillers that expand upon heating, and optionally a sacrificial anti-slip layer, providing thermal stability and slip resistance, with mechanical or adhesive attachment to structural supports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-layer membranes are exposed to high temperatures, then fire resistance is improved, but layer delamination occurs compromising structural integrity
Solution Approach 1:
A thermal barrier layer is introduced between the fire-resistant layer and the polymeric layers. This intermediary layer prevents direct thermal transmission to the polymeric layers, avoiding delamination while maintaining fire resistance. The thermal barrier acts as a mediator that protects the structural integrity during fire exposure.
Solution Approach 2:
The membrane employs a composite structure with distinct layers having different thermal properties. The fire-resistant layer contains intumescent materials for fire protection, while the thermal barrier layer has low thermal conductivity. This composite design allows simultaneous achievement of fire resistance and layer bonding stability under thermal stress.
2Reliability
If intumescent fillers are added to provide fire resistance, then fire safety is improved, but the membrane thickness and complexity increase
Solution Approach 1:
The fire-resistant layer and thermal barrier layer are merged into a single integrated layer rather than separate components. This combination reduces the overall number of layers and simplifies the membrane structure while maintaining both fire resistance and thermal protection functions.
Solution Approach 2:
The fire-resistant layer is designed to serve multiple functions: providing fire resistance through intumescent fillers and simultaneously acting as a thermal barrier due to the low thermal conductivity of the expanded intumescent material. This multi-functionality reduces the need for additional dedicated thermal barrier layers.
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 membrane maintains structural integrity and fire resistance across a wide temperature range, passing stringent fire and weathering tests, ensuring durability and longevity.
Implementation Method 1
a fire resistant component (13) comprising a carrier layer (14) and a first fire resistant coating (16) bonded to the carrier layer (14)
Implementation Method 2
the membrane being capable of maintaining its structure when exposed to adverse weathering such as at temperatures of below −20° C. and greater than about 60° C. for periods of greater than 12 months
Data Source
AI summary
A multi-layer membrane with fire-resistant properties having improved thermal stability and shelf-life is provided. The multi-layer membrane 10 has at least a water resistant polymeric layer 12 bonded to a fire resistant component 13. The fire resistant component 13 has a first fire retardant coating 16 bonded to a carrier layer 14. The fire resistant component may further include a second fire retardant coating 28 bonded to a surface of the carrier layer opposite to the first fire retardant coating. The first and second fire retardant coatings comprise a filler 24, 30 mixed with a carrier 26, 32. The membrane may include a back bonding layer 36 bonded to the bottommost layer thereof to adhesively secure to a structural support structure such as a roof. A release liner 42 may be releasably secured to the back bonding layer. Additional layers may be included to provide for further support and/or additional functional properties to the membrane.