Maltitol Mineral Wool Binder for Low-Emission Insulation Strength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current sizing compositions for mineral wool insulation products, particularly those using thermosetting resins like phenolic resins, face challenges such as formaldehyde emissions due to unstable urea-formaldehyde condensates, which are harmful to health and the environment, and do not provide optimal tensile strength and thickness recovery.
Innovation Solution
A sizing composition based on a mixture of hydrogenated sugars with at least 25% maltitol and a polyfunctional crosslinking agent, such as citric acid, which reacts to form ester bonds and create a stable polymeric network for fiber bonding, reducing formaldehyde emissions and improving mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional thermosetting resins (phenolic resins with formaldehyde) are used in sizing composition, then good crosslinking ability and binding strength are achieved, but harmful formaldehyde emissions occur during thermal treatment
Solution Approach 1:
The patent changes the chemical composition parameters of the sizing agent by replacing phenolic resins with hydrogenated sugars (maltitol, sorbitol, xylitol) and their derivatives. This substitution maintains the crosslinking capability and binding strength while eliminating formaldehyde emissions, as the sugar-based compounds undergo different thermal degradation pathways that do not produce harmful formaldehyde.
Solution Approach 2:
The invention creates a composite sizing composition combining hydrogenated sugars with silane-based crosslinking agents and catalytic systems. This composite approach allows the sugar component to provide binding strength while the silane component enables crosslinking through alternative chemistry (siloxane bonds instead of formaldehyde-based methylene bridges), thus achieving both performance requirements without harmful emissions.
2Reliability
If resin-based sizing composition is used to ensure fiber assembly and web cohesion, then dimensional stability and tensile strength are achieved, but environmental pollution and health hazards increase
Solution Approach 1:
The patent fundamentally changes the chemical nature of the sizing agent from petroleum-based phenolic resins to naturally derived hydrogenated sugars. This parameter change maintains dimensional stability through effective crosslinking while eliminating the environmental pollution associated with synthetic resin production and disposal, as sugar-based compounds are biodegradable and environmentally benign.
Solution Approach 2:
The invention employs readily available, inexpensive sugar derivatives (maltitol, sorbitol, xylitol) that can be easily sourced from renewable biological materials. These compounds provide effective temporary binding during manufacturing and then decompose harmlessly after use, replacing persistent synthetic resins with environmentally friendly, short-lived organic compounds that fulfill the binding function without long-term environmental impact.
3Strength
If high concentration of crosslinking agents is used to improve tensile strength, then mechanical properties are enhanced, but the complexity of the sizing composition increases
Solution Approach 1:
The patent employs silane-based crosslinking agents that serve multiple functions: they provide crosslinking capability, enhance water resistance, improve adhesion to mineral fibers, and contribute to dimensional stability. This multi-functionality allows achieving high tensile strength without proportionally increasing composition complexity, as a single crosslinking agent system delivers multiple performance benefits simultaneously.
Solution Approach 2:
The invention uses catalytic systems (acids or bases) as intermediaries to facilitate the crosslinking reaction between hydrogenated sugars and silane agents. These catalysts enable the crosslinking process to proceed at moderate temperatures and rates, achieving high tensile strength without requiring excessive amounts of crosslinking agents or complex processing conditions, thus simplifying the overall composition and process.
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 achieves improved tensile strength, dimensional stability, and reduced formaldehyde emissions, resulting in insulation products with enhanced performance and environmental sustainability.
Implementation Method 1
A sizing composition for mineral wool insulation based on a mixture of hydrogenated sugars containing at least 25% maltitol and at least one polyfunctional crosslinking agent
Implementation Method 2
The sheet of fibers coated with the sizing is subjected to a heat treatment, at a temperature generally above 100°C, in order to carry out the polycondensation of the resin
Data Source
AI summary
The present invention relates to a sizing composition for insulating products based on mineral wool, in particular of rock or of glass, characterized in that it comprises a mixture of hydrogenated sugars containing at least 25% by weight of maltitol, calculated on the basis of the dry matter of the hydrogenated sugars, and at least one polyfunctional crosslinking agent. Another subject matter of the present invention is the insulating products based on mineral fibres thus obtained.