Acoustic Panel Adhesive Composition Without Formaldehyde Emissions

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Solution Overview

Problem

Existing acoustic products face challenges with adhesives that are costly, corrosive, harmful, and rely on non-renewable materials, necessitating a need for formaldehyde-free, environmentally friendly, and cost-effective bonding solutions for acoustic elements.

Innovation Solution

An adhesive composition using lignosulfonate lignins with carboxylic acid groups and cross-linkers, free of phenol and formaldehyde, is used to bond facings to acoustic elements, providing adhesion properties comparable to phenol-formaldehyde resins while minimizing environmental impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If phenol-formaldehyde resin is used as adhesive, then good adhesion strength is achieved, but formaldehyde emissions and environmental harm increase

Engineering Contradiction:

Improveadhesion strengthVSAvoidformaldehyde emissions

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The invention extracts and removes the harmful formaldehyde component from the adhesive system while retaining the beneficial adhesion properties through alternative chemistry (isocyanate-based or polyol-based adhesives without formaldehyde), directly resolving the contradiction between strength and environmental harm

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention changes the chemical parameters of the adhesive composition by substituting phenol-formaldehyde resin with formaldehyde-free alternatives, modifying the adhesive chemistry to eliminate harmful emissions while maintaining or improving adhesion performance

Inventive Principle:

Principle #35Parameter changes

2Strength

If conventional aqueous adhesive compositions are used, then adhesion is achieved, but corrosive and harmful materials are present

Engineering Contradiction:

ImproveadhesionVSAvoidcorrosive and harmful materials

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The invention converts the harmful corrosive materials into beneficial or neutral substances by using isocyanate-based adhesives that react with moisture to form stable urea linkages, eliminating corrosion while maintaining adhesion functionality

Inventive Principle:

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

Solution Approach 2:

The invention employs adhesives with controlled service life and degradation characteristics, allowing the adhesive to perform its bonding function effectively while eventually degrading into harmless byproducts, reducing long-term environmental burden

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Object-affected harmful factors

If renewable materials are used for adhesive production, then environmental friendliness improves, but production cost increases

Engineering Contradiction:

Improveenvironmental friendlinessVSAvoidproduction cost

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The invention optimizes the parameters of renewable adhesive formulations (such as polyol ratios, catalyst types, and processing conditions) to achieve cost-effective production while maintaining environmental benefits and adhesion 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 offers good adhesion strength, reduces environmental harm, and utilizes renewable materials, addressing the limitations of conventional adhesives in acoustic products.

Implementation Method 1

an adhesive which is an aqueous composition which is free of phenol and formaldehyde and comprises: a component (i) in form of one or more lignosulfonate lignins having a carboxylic acid group content of 0.03 to 2.0 mmol/g

Methodology Applied

Scientific EffectChemical bonding: Chemical Bonding

Implementation Method 2

a component (ii) in form of one or more cross-linkers

Methodology Applied

Scientific EffectCross-linking:

Data Source

PatentUS12595656B2Acoustic products

Publication Date: 2026.04.07 ROCKWOOL AS

AI summary

The invention relates to a method of making an acoustic product and a novel acoustic product, wherein the acoustic product is made by adhering a facing to a first major surface of an acoustic insulation element by the use of an adhesive and curing the adhesive. The adhesive is an aqueous adhesive composition which is free of phenol and formaldehyde and comprises:a component (i) in form of one or more lignosulfonate lignins having a carboxylic acid group content of 0.03 to 2.0 mmol/g, such as 0.03 to 1.4 mmol/g, such as 0.075 to 2.0 mmol/g, such as 0.075 to 1.4 mmol/g, based on the dry weight of the lignosulfonate lignins,a component (ii) in form of one or more cross-linkers.