Expandable Graphite Pressure-Sensitive Adhesive Fire Resistance

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Solution Overview

Problem

There is a need to enhance the flame and fire resistance of building materials such as roofing membranes, which current pressure-sensitive adhesives fail to adequately address.

Innovation Solution

Incorporating expandable graphite into pressure-sensitive adhesive compositions, which can be dispersed throughout or concentrated in specific layers, to create a matrix that provides improved flame-spread and fire resistance while ensuring effective adhesion to building materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional pressure-sensitive adhesives are used to adhere building materials, then adhesion performance is achieved, but flame and fire resistance is insufficient

Engineering Contradiction:

Improveflame and fire resistanceVSAvoidfire spread

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent combines expandable graphite particles with pressure-sensitive adhesive components to create a composite adhesive material. The expandable graphite serves as a flame retardant additive that expands when exposed to heat, forming an insulating barrier that prevents fire spread while maintaining the adhesive's bonding functionality.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical composition parameters of the pressure-sensitive adhesive by incorporating expandable graphite at specific concentrations (0.1-10% by weight). This parameter change transforms the adhesive from flammable to fire-resistant while preserving its adhesion properties through optimized formulation.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If expandable graphite is added to pressure-sensitive adhesive, then fire resistance is improved, but adhesive composition complexity increases

Engineering Contradiction:

Improvefire resistanceVSAvoidadhesive composition

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The expandable graphite serves multiple functions simultaneously: it acts as a flame retardant, a reinforcement filler, and a thermal insulator. This multi-functionality reduces the need for separate additives, simplifying the overall formulation approach despite the added component.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The expandable graphite is distributed throughout the adhesive matrix at optimized concentrations, creating localized fire-resistant zones that collectively provide overall flame protection. The graphite particles are strategically positioned within the adhesive structure to maximize fire resistance while minimizing impact on adhesion performance.

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 use of expandable graphite in pressure-sensitive adhesives enhances the flame and fire resistance of building materials like roofing membranes, underlayments, and moisture/vapor barriers, forming fully-adhered systems with improved safety and performance.

Implementation Method 1

pressure-sensitive adhesives that include expandable graphite... providing the construction materials with improved fire and/or flame-spread resistance

Methodology Applied

Scientific EffectExpandable graphite expansion: Thermal Expansion

Data Source

PatentUS9688887B2Pressure-sensitive adhesives including expandable graphite

Publication Date: 2017.06.27 AMRIZE TECHNOLOGY SWITZERLAND LLC

AI summary

A building material comprising a substrate layer and a pressure-sensitive adhesive layer, where the pressure-sensitive adhesive layer includes expandable graphite.