Moisture-Curable Bond Adhesive for Roofing Systems

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Solution Overview

Problem

Current adhesives for fully-adhered roofing systems face limitations such as solvent compatibility issues leading to membrane swelling and blistering, high viscosity at low temperatures, and environmental sensitivity, which restrict their application to specific weather conditions and substrate types, necessitating the development of a bond adhesive that can operate effectively across a broader temperature range and reduce VOC emissions.

Innovation Solution

A bond adhesive composition comprising a polymer with silicon-containing hydrolyzable terminal groups, a hydrocarbon tackifier resin, and a low VOC-generating moisture scavenger, applied solely to the substrate without needing to be applied to the membrane, allowing for improved adhesion and reduced volatile compound release, enabling installation at lower temperatures and on various substrates, including existing membranes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If conventional adhesives are used for fully-adhered roofing systems, then strong bonding is achieved, but solvent compatibility issues cause membrane swelling and blistering

Engineering Contradiction:

Improvebonding strengthVSAvoidmembrane swelling and blistering

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical parameters of the adhesive by using silicon-containing polymers with specific molecular weights and vinyl-trimethoxysilane crosslinking agents, creating a moisture-curable adhesive that cures to a flexible, solvent-free bond without causing membrane swelling or blistering

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The adhesive composition combines silicon-containing polymers, vinyl-trimethoxysilane crosslinking agents, and hydrocarbon tackifier resins to create a composite material that provides both strong bonding and compatibility with roofing membranes, eliminating the harmful solvent-related effects

Inventive Principle:

Principle #40Composite materials

2Strength

If adhesives with high initial peel strength are used, then wind uplift resistance is improved, but application is restricted to specific weather conditions and substrate types

Engineering Contradiction:

Improveinitial peel strengthVSAvoidapplication conditions and substrate compatibility

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The moisture-curable adhesive system is designed to work universally across multiple substrate types (concrete, metal, wood decks, insulation boards, and existing membranes) and weather conditions by relying on moisture from the air or substrate for curing, eliminating temperature and humidity restrictions

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Area of stationary object

If adhesive is applied to both substrate and membrane, then coverage is improved, but installation time increases due to flash-off period requirements

Engineering Contradiction:

Improveadhesive coverage areaVSAvoidinstallation time

Core Design Contradiction:

Area of stationary objectVSLoss of time

Solution Approach 1:

The patent eliminates the flash-off period step by using a moisture-curable adhesive that does not require solvent evaporation. The adhesive is applied to the substrate only, and curing begins immediately upon exposure to moisture from the air or substrate, significantly reducing installation time

Inventive Principle:

Principle #2Taking out (Extraction)

4Strength

If phenolic resin-containing adhesives are used, then bonding performance is improved, but VOC emissions increase

Engineering Contradiction:

Improvebonding performanceVSAvoidVOC emissions

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters by replacing phenolic resins with silicon-containing polymers and vinyl-trimethoxysilane crosslinking agents, creating an adhesive that cures through moisture-induced condensation reactions, eliminating VOC emissions while maintaining bonding performance

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 adhesive composition provides strong, durable bonds that meet wind uplift standards without fleece backing, allows for efficient coverage, and reduces blistering and VOC emissions, enabling installation in a wider range of conditions and on diverse substrates, enhancing the reliability and efficiency of fully-adhered roofing systems.

Implementation Method 1

a polymer having a silicon-containing hydrolyzable terminal group

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Implementation Method 2

silicon-containing hydrolyzable terminal groups... providing a high initial peel strength and a high peel strength when fully cured

Methodology Applied

Scientific EffectCondensation: Condensation

Implementation Method 3

a non-polymeric silicon-containing hydrolyzable compound... moisture scavengers such as vinyl-trimethoxysilanes

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Data Source

PatentUS11686094B2Bonding adhesive and adhered roofing systems prepared using the same

Publication Date: 2023.06.27 AMRIZE TECHNOLOGY SWITZERLAND LLC

AI summary

A method is provided for forming an adhered membrane roof system that meets Factory Mutual (FM) 4470/4474 standards for wind uplift. The method comprises applying a bond adhesive to a substrate on a roof to form an adhesive layer and applying a membrane directly to the adhesive layer. The bond adhesive includes a moisture-curable polymer.