Roofing Membrane Coating with Expandable Graphite for Flame Resistance

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Solution Overview

Problem

Existing roofing materials lack effective flame resistance and resistance to flame spread, which poses a risk in construction and roofing applications.

Innovation Solution

A thermoplastic polyolefin roofing membrane is developed using a coated fabric with a polymeric binder and expandable graphite, providing improved flame resistance and resistance to flame spread.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional coated fabrics are used for roofing, then the roofing material provides basic coverage and durability, but it lacks effective flame resistance and resistance to flame spread

Engineering Contradiction:

Improveflame resistanceVSAvoidflame spread risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies composite materials by combining expandable graphite particles with a polymeric binder to create a coated fabric that integrates both structural integrity and flame resistance. The expandable graphite particles (5-500 micrometers in size) are dispersed throughout the binder, forming a composite coating system that provides superior fire resistivity compared to conventional single-material roofing fabrics.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent utilizes parameter changes by incorporating expandable graphite that undergoes volumetric expansion when exposed to fire temperatures. This phase change mechanism transforms the graphite particles into an insulating barrier that resists flame spread, dynamically changing the material's physical properties in response to thermal stress.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If expandable graphite is added to the coating, then fire resistivity is enhanced, but the coating formulation becomes more complex

Engineering Contradiction:

Improvefire resistivityVSAvoidcoating formulation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by concentrating the flame-resistant properties specifically within the coating layer containing expandable graphite, while the underlying fabric substrate maintains its structural functions. This localized approach to fire resistance allows the bulk material to remain relatively simple while achieving superior performance at the critical surface interface.

Inventive Principle:

Principle #3Local quality

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 exhibits enhanced fire resistivity and reduced flame spread, making it suitable for construction materials that require improved safety and performance.

Implementation Method 1

expandable graphite dispersed throughout the binder

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Implementation Method 2

expandable graphite dispersed throughout the binder

Methodology Applied

Scientific EffectIntumescent effect: Intumescent Materials

Implementation Method 3

a coating on said substrate, the coating consisting of binder and expandable graphite dispersed throughout the binder

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentEP2948586B1Roofing membrane including expandable graphite

Publication Date: 2019.07.10 FIRESTONE BUILDING PROD CO LLC

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AI summary

A coated fabric comprising a fabric substrate and a coating on said substrate, the coating comprising a binder and expandable graphite dispersed throughout the binder.