Polyphenolic Binder Compositions for High-Strength Fiber Bonding
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Solution Overview
Problem
Existing binder compositions for manufacturing products from non or loosely assembled matter, such as fiberglass and wood boards, face challenges with high water loss during condensation reactions, which negatively impact internal bond strength and swelling properties, and there is a need for alternative chemistries that are cost-effective, sustainable, and rapidly curing.
Innovation Solution
Aqueous curable binder compositions comprising a polyphenolic macromolecular compound, such as lignosulfonate salts, and a polyamine functional compound, like hexamethylenediamine, that form a thermoset binder with high bond strength and minimal water generation during curing, using a ratio of polyphenolic to polyamine compounds ranging from 98:2 to 70:30, and optionally including matrix polymers like cellulose derivatives or polyurethane polymers for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If formaldehyde-based binders are used, then bond strength is achieved, but water loss during condensation reaction increases and internal bond strength decreases
Solution Approach 1:
The patent changes the chemical parameters of the binder system by using polyamine-functional compounds instead of formaldehyde-based binders. This parameter change eliminates water generation during condensation while maintaining bond strength through alternative chemical mechanisms involving polyamine functional groups reacting with polyphenolic macromolecular compounds.
Solution Approach 2:
The patent creates a composite binder system combining polyamine-functional compounds with polyphenolic macromolecular compounds. This composite approach produces a thermoset binder that achieves both high bond strength and minimal water loss by leveraging the complementary properties of both material classes.
2Ease of manufacture
If alternative formaldehyde-free binders are used, then sustainability is improved, but curing rate decreases
Solution Approach 1:
The patent develops a binder system that copies the high-performance characteristics of formaldehyde-based binders (fast curing, strong bonds) while using sustainable polyamine-functional compounds and polyphenolic macromolecular compounds as alternatives. The chemical mechanism is designed to replicate the efficient curing behavior of conventional binders without relying on formaldehyde.
Solution Approach 2:
The patent modifies the chemical reactivity parameters of the binder system by selecting polyamine-functional compounds with specific functional group concentrations and molecular weights. These parameter adjustments enable the sustainable binder to cure at rates comparable to or exceeding formaldehyde-based systems while maintaining environmental benefits.
3Strength
If condensation reaction is used in binder formation, then bond strength is achieved, but water generation increases and manufacturing energy consumption increases
Solution Approach 1:
The patent converts the typically harmful byproduct of condensation reactions (water) into a benefit by designing a reaction system that generates minimal water. The polyamine-functional compound reacts with polyphenolic macromolecular compounds through a mechanism that avoids extensive water generation, thereby reducing the energy required for subsequent drying or curing steps.
Solution Approach 2:
The patent changes the reaction stoichiometry and mechanism parameters to minimize water generation during binder formation. By adjusting the molecular structure and functional group composition of the reactants, the system achieves bond strength through alternative chemical pathways that produce less water, thereby reducing thermal energy consumption during manufacturing.
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 binder compositions achieve high bond strength, fast curing rates, and reduced water generation, leading to improved mechanical properties and energy efficiency in manufacturing processes, particularly suitable for fiber boards and wood products, while being environmentally friendly and formaldehyde-free.
Implementation Method 1
Known thermosetting binders comprise a variety of phenol-aldehyde, urea-aldehyde, melamine-aldehyde, and other condensation-polymerization materials
Implementation Method 2
These alternative chemistries show advantages as compared to prior formaldehyde based technology, but also show certain weaknesses
Data Source
AI summary
The present invention relates to a new aqueous curable binder composition comprising a polyphenolic macromolecular compound which bears a multitude of catechol radicals (dihydroxybenzene), preferably lignosulfonate salts and condensed tannins and mixtures thereof, and a polyamine functional compound comprising primary and/or secondary and/or tertiary and/or quaternary amine functional groups, suitable for bonding particulate matter, such as fibers, more particularly mineral wool fibers, or particles, such as wood particles.