Mineral Wool Binder Composition Without Formaldehyde Emissions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing manufacturing processes for thermal and acoustic insulation products using mineral wool face challenges with formaldehyde emissions from traditional thermosetting resins, which are harmful to health and the environment, and require the development of formaldehyde-free alternatives that maintain product stability and performance, especially in humid environments.
Innovation Solution
A formaldehyde-free sizing composition comprising non-reducing sugars, such as sucrose, and ammonium salts of inorganic acids, which react to form a polymeric network that binds mineral fibers, providing elasticity and resistance to aging, is applied to mineral wool fibers and crosslinked at temperatures between 100°C to 200°C to create a stable binder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional thermosetting resins (phenolic resins with formaldehyde) are used as binders, then good binding ability and crosslinking performance are achieved, but harmful formaldehyde emissions occur that damage health and environment
Solution Approach 1:
The invention changes the chemical composition parameters of the binder by replacing phenolic resins with formaldehyde-free alternatives comprising cellulose derivatives (5-50 wt%), polyols (30-60 wt%), and catalysts (0.1-5 wt%). This parameter substitution eliminates formaldehyde emissions while maintaining binding performance through the polyol-cellulose crosslinking system.
Solution Approach 2:
The invention uses readily available, inexpensive materials such as cellulose derivatives (from plant fibers), polyols (from petrochemical or bio-based sources), and common catalysts. These materials are processed completely during crosslinking, leaving no harmful residues, effectively replacing expensive and harmful phenolic resins with economical, environmentally benign alternatives.
2Object-generated harmful factors
If the binder system is changed to eliminate formaldehyde, then harmful emissions are reduced, but product stability and performance in humid environments may deteriorate
Solution Approach 1:
The invention creates a composite binder system combining cellulose derivatives (providing structural framework and humidity resistance), polyols (providing crosslinking capability and elasticity), and catalysts (enabling complete curing). This composite approach leverages the complementary strengths of each component to achieve both environmental compliance and product reliability in humid conditions.
Solution Approach 2:
The invention optimizes the formulation parameters including the ratio of cellulose to polyol (5:3 to 3:7), the selection of specific catalysts (metal salts or organic compounds), and the molecular weight of polyols. These parameter adjustments ensure complete crosslinking and maximum stability while eliminating formaldehyde, with accelerated aging tests confirming superior performance retention.
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 solution effectively binds mineral fibers, enhancing the thermal and acoustic insulation products' resistance to aging and dimensional stability while reducing harmful emissions, as demonstrated by improved tensile strength and retention percentages after accelerated aging tests.
Implementation Method 1
a sizing composition capable of crosslinking to form a binder, which contains at least one non-reducing sugar and at least one ammonium salt of inorganic acid
Implementation Method 2
in order to carry out the polycondensation of the resin and thus obtain a thermal and/or acoustic insulation product
Implementation Method 3
The sheet of fibers coated with the sizing is subjected to a heat treatment, at a temperature generally above 100°C
Implementation Method 4
said wool is treated or said fibers at a temperature allowing the crosslinking of the sizing and the formation of an infusible binder
Data Source
Figure 1
AI summary
The present invention relates to a formaldehyde-free sizing composition for fiber materials, in particular inorganic fibers such as fiberglass or stone wool, including: at least one non-reducing sugar; and at least one inorganic-acid ammonium salt, preferably selected from among ammonium sulfates, phosphates, nitrates, and carbonates. The invention also relates to the resulting materials, in particular mineral-wool thermal or sound insulation and non-woven inorganic-fiber mats, and to the method for manufacturing same.