Pre-Reacted Carbohydrate Binder Composition for Fast Cure Stability
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Solution Overview
Problem
Current formaldehyde-free binders, such as carbohydrate-based and acrylic acid-poly(vinyl alcohol) binders, face issues like high production costs, lower reaction rates, and compatibility challenges with traditional phenol formaldehyde binders, leading to problems with storage and shipment due to quick gelling and recrystallization.
Innovation Solution
A water-soluble pre-reacted binder composition is developed by reacting carbohydrates with nitrogen-containing components, resulting in a composition with high solid content that is stable and can be stored without gelling, featuring intermediate reaction species, reduced viscosity, and increased molecular weight, which can be further crosslinked to form a polymeric binder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If carbohydrate-based binders are used as formaldehyde-free alternatives, then environmental acceptability and renewability are improved, but reaction rate and cure time are worsened
Solution Approach 1:
The patent introduces pre-reaction intermediates (prepolymers) formed by reacting carbohydrates with nitrogen-containing components before final curing. These intermediates serve as a bridge between the slow natural reaction of carbohydrate binders and the need for fast curing, enabling both environmental acceptability and improved reaction rate.
Solution Approach 2:
The patent performs a preliminary reaction step where carbohydrates are pre-reacted with nitrogen-containing components to form prepolymers before the final curing stage. This preliminary action creates reactive intermediates that accelerate the subsequent curing process while maintaining the formaldehyde-free advantage.
2Stability of the object's composition
If high solid content binder compositions are used, then storage stability is improved, but viscosity increases making application difficult
Solution Approach 1:
The patent changes the chemical parameters of the binder composition by introducing specific nitrogen-containing components and controlling the pre-reaction conditions. This creates a composition with high solid content that maintains reduced viscosity through controlled molecular weight of prepolymers and specific chemical structure, enabling both storage stability and application ease.
3Duration of action of stationary object
If pre-reacted binder compositions are used, then shelf-life is improved, but gelling and recrystallization issues may occur
Solution Approach 1:
The patent applies local quality control by specifically designing the pre-reaction to create prepolymers with controlled molecular weight and structure in certain regions of the composition. This localized control prevents premature gelling and recrystallization while maintaining extended shelf-life, as the prepolymers retain water solubility and resist unwanted phase separation.
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 pre-reacted binder composition improves cure times, bond strength, and stability, reducing microbial degradation and fading, while maintaining compatibility with established processes and environmental acceptability.
Implementation Method 1
comprising the reaction product(s) of (i) at least one carbohydrate component, and (ii) at least one nitrogen-containing component
Data Source
AI summary
The present invention relates to a water-soluble pre-reacted binder composition, a method of its manufacture, a use of said pre-reacted binder composition, a method of manufacturing a collection of matter bound by a polymeric binder, a binder solution or dispersion comprising said pre-reacted binder composition, as well as products comprising the pre-reacted binder composition in a cured state.