Carbohydrate Thermosetting Binder for Rapid Cure and Flexibility
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Solution Overview
Problem
There is a need for an inexpensive, formaldehyde-free, thermosetting binder derived from renewable materials that develops strength early in the curing process, as existing formaldehyde-free binders are either stiff, unsuitable for flexible substrates, or cure too slowly for practical application.
Innovation Solution
An aqueous composition comprising 25% to 87% carbohydrate (with at least 30% dextrose) and 8% ammonium salt of an inorganic acid, along with an emulsion polymer, which can include a Lewis acid catalyst, to create a rapid curing binder suitable for various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing formaldehyde-free binders (polycarboxylic acid polymer and polyol) are used, then they are derived from renewable materials, but they cure too slowly for practical application and are stiff unsuitable for flexible substrates
Solution Approach 1:
The patent changes the chemical parameters of the binder system by using ammonium salts of inorganic acids (providing ammonium ions and acid radicals) combined with carbohydrates and emulsion polymers. This parameter change enables rapid curing through acid-base reactions and Maillard reactions, while the emulsion polymer component maintains flexibility in the cured product, resolving both the slow curing and stiffness problems of existing renewable binders.
Solution Approach 2:
The invention creates a composite binder system combining three main components: carbohydrates (for rapid curing through Maillard reaction), ammonium salts of inorganic acids (for acid-base reaction and curing catalysis), and emulsion polymers (for flexibility and adhesion). This composite approach allows the binder to exhibit both rapid curing characteristics and flexible final properties, overcoming the limitations of single-component systems.
2Productivity
If phenol/formaldehyde or urea/formaldehyde resins are used, then they provide excellent cost/performance ratio, but they contain formaldehyde which causes health and environmental problems
Solution Approach 1:
The patent extracts and eliminates formaldehyde from the binder system while maintaining the performance characteristics of formaldehyde-based resins. By using carbohydrates (which can undergo Maillard reaction similar to formaldehyde resins) combined with ammonium salts, the invention achieves rapid curing and strong binding without incorporating formaldehyde, thus removing the harmful substance while preserving productivity.
Solution Approach 2:
The invention uses carbohydrates as a renewable, inexpensive feedstock alternative to petroleum-based formaldehyde. Carbohydrates can be derived from agricultural sources and provide the necessary reactive functionality for rapid curing through Maillard reaction, offering a cost-effective and environmentally friendly substitute that maintains binding performance without the harmful effects of formaldehyde.
3Reliability
If binders from petroleum feed stocks are used, then they provide consistent performance, but petroleum is dwindling and experiencing wide price fluctuations
Solution Approach 1:
The patent employs carbohydrates as a universal feedstock that can be derived from multiple renewable sources (corn, wheat, rice, potatoes, sugarcane, etc.). This multi-sourcing capability provides adaptability to different agricultural regions and seasons, ensuring feedstock availability regardless of petroleum market conditions. The carbohydrate platform maintains performance consistency while offering versatility in sourcing.
Solution Approach 2:
The invention changes the feedstock parameter from non-renewable petroleum to renewable carbohydrates, fundamentally altering the supply chain characteristics. This parameter change enables the binder system to adapt to agricultural production cycles and diverse geographic sources, providing both reliability through standardized processing and versatility through multiple renewable feedstock options, thereby overcoming petroleum's dwindling supply and price volatility.
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 composition provides a flexible, formaldehyde-free thermosetting binder that cures quickly and maintains mechanical strength, suitable for applications like insulation and roofing materials, derived from renewable resources rather than petroleum-based feedstocks.
Implementation Method 1
comprising one or more ammonium salt of an inorganic acid and at least one carbohydrate
Implementation Method 2
which binder is thought to cure by way of a Maillard reaction
Implementation Method 3
The aqueous compositions may function as binders. Preferably, the carbohydrate is a monosaccharide or disaccharide. In a preferred embodiment, the aqueous binder composition additionally comprises a Lewis acid catalyst.
Implementation Method 4
an emulsion polymer in an amount of from 5% to 50% by weight of polymer solids, as a percentage of total composition solids
Data Source
AI summary
A curable binder composition consisting essentially of one or more ammonium salt of an inorganic acid and at least one carbohydrate, and the use thereof as a thermosetting binder. Also described are composite materials comprising the curable binder composition, and methods of application.