Carbohydrate Thermoset Binder for Rapid Formaldehyde-Free Curing
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Solution Overview
Problem
There is a need for an inexpensive, formaldehyde-free, thermosetting binder derived from renewable materials that cures rapidly and is suitable for various applications, including insulation and roofing, as existing formaldehyde-free binders are either too stiff or cure too slowly for practical use.
Innovation Solution
Aqueous compositions comprising one or more ammonium salts of inorganic acids and carbohydrates, such as monosaccharides or disaccharides, with a Lewis acid catalyst, which provide a flexible and strong thermoset binder that can be used without formaldehyde, suitable for a wide range of substrates including fibers and mats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing formaldehyde-free binders (polycarboxylic acid polymer and polyol) are used, then they provide flexibility and can be derived from renewable materials, but they cure too slowly for practical application
Solution Approach 1:
The patent changes the chemical parameters of the binder system by using ammonium salts of polycarboxylic acids with specific molecular weights and carbohydrate compositions. This parameter change enables the binder to cure rapidly through a different chemical mechanism (ammonium carbamate formation and dehydration) while maintaining flexibility, thus resolving the contradiction between curing speed and flexibility.
2Productivity
If Maillard reaction binders (amine component with reducing sugar) are used, then they provide rapid curing, but they are too stiff and unsuitable for flexible substrates
Solution Approach 1:
The patent applies local quality by using ammonium salts of polycarboxylic acids with controlled molecular weights (500-5000) and specific carbohydrate compositions. This creates a binder system with localized chemical properties that enable rapid curing through ammonium carbamate formation while maintaining overall system flexibility, thus resolving the contradiction between curing speed and flexibility.
3Reliability
If phenol/formaldehyde or urea/formaldehyde resins are used, then they provide excellent binding performance and are cost-effective, 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 binding performance. It achieves this by using ammonium salts of polycarboxylic acids and carbohydrates that cure through alternative mechanisms (ammonium carbamate formation and dehydration) without requiring formaldehyde, thus resolving the contradiction between binding performance and formaldehyde-free formulation.
4Reliability
If petroleum-based feed stocks are used for binders, then they provide consistent performance, but they are dwindling and experiencing wide price fluctuations
Solution Approach 1:
The patent applies universality by using carbohydrates as a versatile, renewable feed stock that can be derived from multiple sources (agricultural crops, forestry products, food industry by-products). This multi-functional approach provides performance consistency while ensuring sustainability and price stability, thus resolving the contradiction between performance reliability and feed stock sustainability.
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 composition achieves rapid curing and strong mechanical properties, making it suitable for applications like insulation and roofing, while being environmentally friendly and cost-effective by using renewable resources instead of petroleum-based materials.
Implementation Method 1
aqueous compositions comprising one or more ammonium salts of inorganic acids and carbohydrates, such as monosaccharides or disaccharides
Implementation Method 2
rapid curing and strong mechanical properties
Implementation Method 3
with a Lewis acid catalyst
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.