Polyphenolic Binder Composition for Rapid Curing and Low Water Loss
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Solution Overview
Problem
Existing binder compositions, particularly those based on formaldehyde, face challenges such as high water loss during condensation reactions, which negatively impact internal bond strength and swelling properties of products, and there is a need for alternative chemistries that are cost-effective, sustainable, and provide high bond strength with rapid curing.
Innovation Solution
Aqueous curable binder compositions comprising a polyphenolic macromolecular compound, such as lignosulfonate salts, and a polyamine functional compound, along with a matrix polymer, which react to form a thermoset binder with high bond strength and minimal water generation during curing, utilizing a ratio of polyphenolic to polyamine compounds ranging from 98:2 to 70:30 and incorporating polymers like cellulose derivatives and polyurethane matrix polymers for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If formaldehyde-based binders are used, then bond strength is achieved, but high water loss during condensation reaction occurs which negatively impacts internal bond strength and swelling properties
Solution Approach 1:
The invention changes the chemical parameters of the binder system by using polyphenolic compounds (lignin, tannins) and polyamines instead of formaldehyde-based chemistry. This fundamental parameter change in the chemical reaction pathway eliminates the high water loss problem while maintaining bond strength through different curing mechanisms that produce minimal byproducts.
Solution Approach 2:
The invention discards the harmful formaldehyde-based condensation chemistry that produces excessive water loss, and recovers beneficial natural polyphenolic compounds from renewable resources. This allows achieving bond strength through alternative chemistry that doesn't suffer from the water loss drawback.
2Ease of manufacture
If alternative formaldehyde-free binder chemistries are used, then sustainability and cost-effectiveness are improved, but relatively high water loss in condensation reaction occurs
Solution Approach 1:
The invention changes the chemical reaction parameters by selecting polyphenolic-polyamine chemistry over other alternative formaldehyde-free options. This parameter change maintains the cost-effectiveness and sustainability benefits of alternative chemistries while eliminating the high water loss problem through a different reaction mechanism.
3Productivity
If rapid curing is achieved, then productivity is improved, but curing conditions may compromise bond strength or product quality
Solution Approach 1:
The invention changes the kinetic parameters of the curing reaction by using polyamine-functional compound chemistry that inherently provides rapid curing rates. The chemical structure and reactivity of polyamines with polyphenolic compounds enable fast curing under mild conditions, achieving both high productivity and strong bonds without compromise.
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, making them suitable for large-volume applications, particularly in fiber and wood board production, while being environmentally friendly and based on renewable resources.
Implementation Method 1
an aqueous curable binder composition comprising a polyphenolic macromolecular compound and a polyamine functional compound... which react to form a thermoset binder with high bond strength
Implementation Method 2
Known thermosetting binders comprise a variety of phenol-aldehyde, urea-aldehyde, melamine-aldehyde, and other condensation-polymerization materials... the polyphenolic macromolecular compound and a polyamine functional compound... react to form a thermoset binder
Data Source
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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, suitablefor bonding particulate matter, such as fibers, more particulary mineral wool fibers, or particles, such as wood particles.