Low-Formaldehyde Sizing Composition for Mineral Fiber Insulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current sizing compositions for mineral fibers, particularly glass or rock, face challenges with high levels of free formaldehyde, which are harmful and unstable under heat treatment, leading to undesirable gas emissions and reduced thermal stability in insulation products.
Innovation Solution
A sizing composition using a liquid phenolic resin with low levels of free formaldehyde, obtained through a process involving phenol and formaldehyde condensation with a basic catalyst, and the introduction of monoethanolamine, combined with an extender like carbohydrates, to achieve improved stability and reduced formaldehyde emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If phenol and formaldehyde are condensed with a basic catalyst in a formaldehyde/phenol molar ratio greater than 1 to reduce phenol level, then phenol residual is reduced, but free formaldehyde level becomes too high to satisfy regulatory constraints
Solution Approach 1:
An amine is introduced as an intermediary substance that reacts with free formaldehyde to form Mannich bases, thereby reducing the harmful formaldehyde level while maintaining the beneficial low phenol residual from the initial condensation reaction
Solution Approach 2:
The formaldehyde/phenol molar ratio is controlled to be greater than 1 during condensation, and the amine/phenol molar ratio is optimized between 0.05-0.50, changing the chemical parameters to achieve both low phenol and low formaldehyde levels simultaneously
2Object-generated harmful factors
If urea is added to react with free formaldehyde to form urea-formaldehyde condensates, then free formaldehyde level is reduced, but the resin is not stable under heat treatment conditions and releases formaldehyde during cooking
Solution Approach 1:
The patent replaces unstable urea-formaldehyde condensates with stable Mannich bases formed from amine-formaldehyde condensation, eliminating the temporary formaldehyde reduction approach that fails under heat treatment
Solution Approach 2:
The patent changes the chemical composition by using amine/phenol molar ratios between 0.05-0.50 instead of urea, fundamentally altering the resin chemistry to achieve both low formaldehyde and high thermal stability
3Ease of operation
If the resin is diluted in a large quantity of water to improve sprayability, then sprayability is improved, but the resin must remain stable for at least 8 days at 12-18°C with dilutability greater than 1000%
Solution Approach 1:
The resin composition parameters are optimized with specific amine/phenol ratios and controlled free formaldehyde levels, enabling the resin to maintain both high dilutability (>1000%) for sprayability and stability during storage for at least 8 days at 12-18°C
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 provides a resin with enhanced thermal stability, low formaldehyde emissions, and high dilutability, ensuring effective binding of fibers and maintaining the properties of insulation products, such as dimensional stability and tensile strength, while adhering to regulatory standards.
Implementation Method 1
a resin obtained by condensation of phenol, formaldehyde and amine in the presence of a basic catalyst
Implementation Method 2
The sizing composition is most often sprayed onto the fibers
Implementation Method 3
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
Implementation Method 4
carry out the polycondensation of the resin and thus obtain a thermal and/or acoustic insulation product having specific properties, including dimensional stability, tensile strength
Data Source
AI summary
The present invention relates to a sizing composition for mineral fibers, especially glass fibers or rock fibers, containing a liquid phenolic resin having a free formaldehyde content of less than or equal to 0.1% by total weight of liquid and an extender. The liquid phenolic resin is preferably mainly composed of condensates of phenol-formaldehyde and of phenol-formaldehyde-amine and has a water dilutability, at 20°C, at least equal to 1000%. Another subject of the invention is the insulating products based on mineral fibers treated with said sizing composition.