Mineral Wool Binder Composition for Formaldehyde-Free Curing

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Solution Overview

Problem

Existing mineral wool insulation binder systems often release formaldehyde, posing health and environmental concerns, and may have inadequate curing properties, leading to reduced product integrity and increased costs due to equipment corrosion.

Innovation Solution

A binder system using a reducing sugar, an acid precursor derivable from an inorganic salt, and a source of nitrogen, which minimizes formaldehyde release and enhances curing by forming a thermoset binder through a Maillard reaction, allowing for bulk polymerization in a dry state, thereby improving the strength and durability of mineral wool insulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If conventional binder systems are used, then curing properties are achieved, but formaldehyde is released causing health and environmental concerns

Engineering Contradiction:

Improveformaldehyde releaseVSAvoidcuring properties

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The invention changes the chemical composition parameters of the binder system by replacing organic acid precursors with inorganic salt-derived acid precursors (ammonium sulphate, ammonium phosphate, ammonium carbonate). This substitution maintains the Maillard reaction curing mechanism while eliminating formaldehyde release, thus resolving the contradiction between harmful factors and curing reliability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses inexpensive inorganic salts (ammonium sulphate, ammonium phosphate, ammonium carbonate) as acid precursors instead of more expensive organic acids. These inorganic salts effectively provide the necessary acidity for the Maillard reaction without the harmful byproducts, achieving cost-effective formaldehyde-free binding

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Ease of manufacture

If inorganic salt-derived acid precursors are used, then cost and availability are improved, but binder composition stability may be affected

Engineering Contradiction:

Improvecost and availabilityVSAvoidbinder composition stability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The invention introduces pH control agents (ammonia, ammonium hydroxide, or alkaline substances) as intermediaries to regulate the acidity generated by inorganic salt hydrolysis. These intermediaries maintain optimal pH levels (7-10) for the Maillard reaction, ensuring binder composition stability while using cost-effective inorganic salts

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention optimizes the ratio of inorganic salt to carbohydrate and controls pH parameters to ensure stable binder performance. By maintaining specific pH ranges and ingredient proportions, the system achieves reliable curing properties while using inexpensive inorganic salt precursors

Inventive Principle:

Principle #35Parameter changes

3Reliability

If ammonium nitrate is used as acid precursor, then curing is enhanced, but oxidation of carbohydrate and explosion risk increase

Engineering Contradiction:

Improvecuring enhancementVSAvoidoxidation and explosion risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention extracts and eliminates ammonium nitrate from the binder system due to its harmful oxidation properties and explosion risks. Instead, it selectively uses safer inorganic salts (ammonium sulphate, ammonium phosphate, ammonium carbonate) that provide equivalent acid precursor functionality without the dangerous side effects

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention converts the potential harm of using strong oxidizing agents like ammonium nitrate into benefit by selecting inorganic salts that provide controlled acidity through hydrolysis without oxidation. This substitution maintains curing effectiveness while eliminating the harmful oxidation of carbohydrate components and explosion hazards

Inventive Principle:

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

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 binder system achieves substantial formaldehyde-free insulation products with improved mechanical properties, reduced equipment corrosion, and enhanced durability, while maintaining cost-effectiveness and environmental safety.

Implementation Method 1

Methodology Applied

Scientific EffectMaillard reaction: Chemical Bonding

Data Source

PatentEP3670465A1Mineral wool insulation

Publication Date: 2020.06.24 KNAUF INSULATION SPRL

Figure 1

AI summary

A method of manufacturing a mineral fibre thermal insulation product comprises the sequential steps of: • Forming mineral fibres from a molten mineral mixture; • spraying a substantially formaldehyde free binder solution on to the mineral fibres, the binder solution comprising: a reducing sugar, an acid precursor derivable from an inorganic salt and a source of nitrogen; • Collecting the mineral fibres to which the binder solution has been applied to form a batt of mineral fibres; and • Curing the batt comprising the mineral fibres and the binder which is in contact with the mineral fibres by passing the batt through a curing oven so as to provide a batt of mineral fibres held together by a substantially water insoluble cured binder.