Expandable Graphite Liquid Coatings for Roof Fire Resistance

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Solution Overview

Problem

Existing liquid coatings for building materials, particularly roofs, lack sufficient flame and fire resistance, which is a critical concern for safety and durability.

Innovation Solution

Incorporating expandable graphite into liquid coating compositions, such as polyurethane, resin, and polymer-modified asphalt coatings, to create a seamless membrane with enhanced flame and fire resistance properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If traditional liquid coatings (acrylic, urethane, silicone) are used for roofing, then the coating provides basic waterproofing and durability, but the flame and fire resistance is insufficient

Engineering Contradiction:

Improveflame and fire resistanceVSAvoidsafety performance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent combines traditional liquid coating materials (acrylic, urethane, silicone, or polymer-modified asphalt) with expandable graphite to create a composite coating system. This composite structure allows the coating to maintain its waterproofing and durability functions while gaining enhanced flame and fire resistance from the graphite component, which expands when exposed to heat to form a protective char layer.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical composition parameters of the liquid coating by incorporating expandable graphite at specific concentrations. This parameter change transforms the coating's thermal response characteristics, enabling it to resist flame spread and meet fire safety standards while preserving its original protective functions.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If expandable graphite is incorporated into liquid coating compositions, then flame-spread and fire resistance are significantly improved, but the coating formulation complexity increases

Engineering Contradiction:

Improveflame-spread resistanceVSAvoidcoating formulation complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The expandable graphite serves multiple functions simultaneously: it provides flame retardancy, enhances fire resistance, and maintains the coating's waterproofing properties. This multi-functionality reduces the need for separate additive systems and simplifies the overall formulation approach despite the enhanced performance requirements.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 use of expandable graphite in liquid coatings significantly improves the flame-spread and fire resistance of roofing membranes, providing a barrier that meets or exceeds industry standards for safety and durability.

Implementation Method 1

expandable graphite dispersed within said coating composition

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Implementation Method 2

expandable graphite

Methodology Applied

Scientific EffectIntumescent effect: Intumescent Materials

Implementation Method 3

providing a barrier that meets or exceeds industry standards for safety and durability

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS10941272B2Liquid coatings including expandable graphite

Publication Date: 2021.03.09 AMRIZE TECHNOLOGY SWITZERLAND LLC

AI summary

A method of preparing a seamless membrane over a flat or low-sloped roof, the method comprising applying multiple layers of a liquid coating composition over a roof surface, where said step of applying includes applying at least one layer of a liquid coating composition that includes expandable graphite.