Expandable Graphite Coated Fabrics for Flame-Resistant Roofing Membranes

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Solution Overview

Problem

Coated fabrics used in construction lack effective flame resistance and resistance to flame spread, which is a critical concern for safety and performance in building materials.

Innovation Solution

Incorporating expandable graphite into the coating of fabrics, combined with a polymeric binder and optional additional binders and fillers, to create a fire-resistant and flame-retardant material.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional coating compositions (polymer latex adhesive, mineral pigment, inorganic binder) are used, then the fabric achieves basic coating functionality (liquid impermeability, adhesion), but the fabric lacks effective flame resistance and resistance to flame spread

Engineering Contradiction:

Improveflame resistanceVSAvoidflame spread

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent incorporates expandable graphite into the coating composition, which undergoes endothermic decomposition when exposed to fire. This converts the harmful thermal energy into beneficial cooling effects and expands to form a protective char layer that prevents flame spread, effectively converting the harmful fire exposure into a protective response

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent creates a composite coating material by combining expandable graphite with polymer latex adhesive and inorganic binder. This composite formulation integrates the flame-retardant properties of expandable graphite with the adhesive and structural properties of the binder system, achieving both coating functionality and fire resistance simultaneously

Inventive Principle:

Principle #40Composite materials

2Reliability

If expandable graphite is incorporated into the coating, then flame resistance and resistance to flame spread are improved, but the coating composition complexity increases

Engineering Contradiction:

Improveflame resistanceVSAvoidcoating composition complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent specifies optimal ranges for expandable graphite content (1-50 wt% of coating solids) and particle size (10-500 micrometers) to balance flame resistance performance with coating applicability and structural integrity. By controlling these parameters within defined ranges, the patent achieves effective fire protection while maintaining manageable coating formulation and application processes

Inventive Principle:

Principle #35Parameter changes

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 coated fabrics exhibit improved flame resistance and reduced flame spread, making them suitable for use in construction materials that require enhanced fire safety properties.

Implementation Method 1

expandable graphite dispersed throughout the binder

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS20240318431A1Coated fabrics including expandable graphite

Publication Date: 2024.09.26 AMRIZE TECHNOLOGY SWITZERLAND LLC

AI summary

A method for preparing a roofing membrane in the form of a roll, comprising the steps of: providing a polymeric membrane; providing a fabric having a coating disposed thereon; attaching the polymeric membrane to the fabric to form a composite; and rolling the composite. Wherein the coating includes expandable graphite dispersed within a binder.