Mineral Fibre Insulation Sizing With Poly(Furfuryl Alcohol)

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Solution Overview

Problem

Existing insulating products based on mineral fibres face issues with environmental toxicity and mechanical degradation due to the use of formaldehyde-based resins and acidic sizing compositions that dissolve fibres, violating health and environmental regulations and compromising mechanical properties.

Innovation Solution

A biosourced resin based on poly(furfuryl alcohol) is used to bind mineral fibres, maintaining cohesion without dissolving them at acidic pH, ensuring non-toxicity and superior mechanical properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If formaldehyde-based resins are used to bind mineral fibres, then the insulating product achieves adequate mechanical strength and cohesion, but the product violates health and environmental regulations due to toxicity and carcinogenicity

Engineering Contradiction:

Improvemechanical strengthVSAvoidtoxicity

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The invention changes the chemical composition parameters of the binder by using poly(furfuryl alcohol) instead of formaldehyde-based resins. This substitution maintains the required mechanical strength while eliminating the toxic formaldehyde content, thereby resolving the contradiction between strength and toxicity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses a biosourced resin that is environmentally degradable, replacing the persistent and toxic formaldehyde-based resins. This approach allows the product to meet environmental regulations while maintaining adequate mechanical properties for its intended lifecycle.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Stability of the object's composition

If acidic sizing compositions are used to treat mineral fibres, then the fibres are coated effectively for binding, but the fibres are dissolved and mechanical properties deteriorate

Engineering Contradiction:

ImprovecohesionVSAvoidmechanical properties

Core Design Contradiction:

Stability of the object's compositionVSStrength

Solution Approach 1:

The invention changes the pH parameter of the sizing composition by using a biosourced resin that does not create an acidic environment. This prevents the dissolution of acid-sensitive mineral fibres while still achieving effective coating and binding, thereby resolving the contradiction between cohesion and mechanical strength.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The biosourced resin acts as an intermediary binding agent that provides cohesion without requiring acidic conditions. It mediates between the mineral fibres and the binding function, eliminating the harmful acidic intermediate step that causes fibre dissolution.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If urea treatment is applied to fix free formaldehyde in resins, then the immediate toxicity is reduced, but unstable condensates decompose at processing temperatures releasing formaldehyde and ammonia into the atmosphere

Engineering Contradiction:

Improvefree formaldehyde contentVSAvoidatmospheric emissions

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The invention extracts and eliminates the formaldehyde component from the resin system entirely by using poly(furfuryl alcohol) as the binder. This removes the source of both free formaldehyde and the subsequent decomposition emissions, resolving the contradiction between reducing immediate toxicity and preventing atmospheric pollution.

Inventive Principle:

Principle #2Taking out (Extraction)

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 process produces insulating products with enhanced mechanical strength and stability, adhering to regulatory biopersistence requirements and reducing environmental impact.

Implementation Method 1

A heat treatment, at a temperature generally of greater than 100° C., makes it possible to carry out the curing or the polycondensation of the resin

Methodology Applied

Scientific EffectPolycondensation:

Implementation Method 2

A large number of them are based on the use of polymers of carboxylic acids and/or of saccharides

Methodology Applied

Scientific EffectAcid-base interaction:

Data Source

PatentUS12559423B2Process for the manufacture of an insulating product based on mineral fibres

Publication Date: 2026.02.24 SAINT GOBAIN ISOVER

AI summary

An insulating product includes mineral fibers of aluminosilicate glass including aluminum oxide, Al2O3, in a fraction by weight of between 14% and 28%, that are sized with a sizing composition including the following constituents within the limits defined below, expressed as fractions by weight with respect to the total weight of the composition: from 80% to 98% of water, from 2% to 20% of water-soluble poly(furfuryl alcohol), which is obtained by polycondensation of furfuryl alcohol, and less than 0.5% of furfuryl alcohol, wherein a sum of the fractions by weight of the poly(furfuryl alcohol) and of the water is at least 95%, and wherein the sizing composition applied to the mineral fibres has a pH in a range from 5 to 8.