Mineral Fiber Sizing Composition Without Formaldehyde Emissions
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Solution Overview
Problem
The existing manufacturing of thermal and/or acoustic insulating products using mineral wool faces challenges with formaldehyde emissions from traditional thermosetting resins, which are harmful to health and the environment, and there is a need for formaldehyde-free sizing compositions that provide good resistance to aging, especially in humid environments.
Innovation Solution
A formaldehyde-free sizing composition comprising a non-reducing sugar and an inorganic acid ammonium salt is used to form a polymeric network that binds mineral fibers, providing elasticity and stability to the insulating products, with the composition applied to fibers and treated at elevated temperatures to create a crosslinked binder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional thermosetting resins (resols) are used to bind mineral fibers, then good crosslinkability and dimensional stability are achieved, but formaldehyde emissions occur which are harmful to health and the environment
Solution Approach 1:
The patent changes the chemical composition parameters of the sizing agent by replacing phenolic resins with a formaldehyde-free binder system consisting of polyol and polycarboxylic acid. This substitution maintains the crosslinking capability and dimensional stability while eliminating formaldehyde emissions, directly resolving the technical contradiction between reliability and harmful emissions.
Solution Approach 2:
The patent uses a biodegradable polycarboxylic acid (such as citric acid) as the binder component, which provides the necessary crosslinking function during processing but degrades harmlessly over time, replacing the persistent and harmful formaldehyde-based resins. This approach maintains functional reliability while eliminating long-term environmental harm.
2Strength
If phenolic resins are used in the sizing composition, then good affinity for mineral fibers and crosslinkability are achieved, but the presence of residual phenol and formaldehyde reduces safety and increases environmental impact
Solution Approach 1:
The patent creates a composite binder system combining polyol (providing flexibility and adhesion) with polycarboxylic acid (providing crosslinking capability). This composite approach achieves binding strength comparable to or exceeding phenolic resins while using components that are non-toxic and environmentally benign, eliminating the harmful residual chemicals.
Solution Approach 2:
The polyol acts as an intermediary substance that enhances the affinity between the polycarboxylic acid binder and the mineral fibers, while also contributing to the overall binding strength through its own adhesive properties. This intermediary approach allows the system to achieve strong binding without relying on harmful phenolic resins.
3Strength
If the sizing composition is applied to bind fibers efficiently, then good cohesion and tensile strength are achieved, but resistance to aging in humid environments deteriorates over time
Solution Approach 1:
The patent employs biodegradable polycarboxylic acid (such as citric acid) as the crosslinking agent, which provides effective initial binding and crosslinking for tensile strength, but is designed to degrade controllably over time. This replaces traditional resins that maintain strength through persistent harmful chemicals, achieving a balance between initial strength and controlled aging behavior suitable for environmental applications.
Solution Approach 2:
The patent modifies the chemical structure of the binder by using polycarboxylic acids with specific molecular weights and functional group densities, which provide adequate crosslinking for initial strength while allowing controlled degradation pathways. This parameter optimization enables the material to maintain strength during service life but degrade harmlessly after use, improving long-term environmental compatibility.
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 proposed solution effectively binds mineral fibers, enhancing the thermal and acoustic insulating products' properties, including tensile strength and resistance to aging in humid conditions, while minimizing environmental impact by eliminating formaldehyde emissions.
Implementation Method 1
A formaldehyde-free sizing composition comprising a non-reducing sugar and an inorganic acid ammonium salt is used to form a polymeric network that binds mineral fibers
Implementation Method 2
the composition applied to fibers and treated at elevated temperatures to create a crosslinked binder
Implementation Method 3
the composition applied to fibers and treated at elevated temperatures to create a crosslinked binder
Data Source
AI summary
A formaldehyde-free sizing composition for products based on fibers, in particular mineral fibers, such as fibers of glass or of rock, includes at least one non-reducing sugar, and at least one inorganic acid ammonium salt, preferably chosen from ammonium sulfates, phosphates, nitrates and carbonates. Another subject matter of the present invention is the products thus obtained, in particular thermal and/or acoustic insulators based on mineral wool and veils of nonwoven mineral fibers, and their process of manufacture.