Bio-based binders including carbohydrates and a pre-reacted product of an alcohol or polyol and a monomeric or polymeric polycarboxylic acid
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Solution Overview
Problem
Current binders for fiberglass insulation and non-woven mats face issues such as formaldehyde emissions, machine corrosion, high viscosity, and undesirable properties like dark color and safety risks, necessitating a more environmentally friendly and stable solution.
Innovation Solution
A bio-based binder composition incorporating a carbohydrate from natural sources, a crosslinking agent, and a pre-reacted product of an alcohol or polyol with a monomeric or polymeric polycarboxylic acid, which forms a polyester thermoset resin, is developed, eliminating added formaldehyde and providing improved properties like light color and reduced viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If formaldehyde-based resins are used as binders, then the insulation product provides good structural stability and binding strength, but formaldehyde emissions occur causing environmental pollution and health hazards
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by using phenolic resin without formaldehyde, employing alternative curing mechanisms that eliminate formaldehyde emissions while maintaining binding effectiveness through different chemical reaction pathways
Solution Approach 2:
The patent uses bio-based carbohydrates as temporary binding agents that degrade harmlessly, replacing persistent formaldehyde-based resins with environmentally friendly alternatives that provide sufficient binding during manufacturing but do not pose long-term environmental or health risks
2Reliability
If polyacrylic acid binders are used, then the binder provides good adhesion and binding properties, but the acidity causes corrosion of machine parts
Solution Approach 1:
The patent extracts and eliminates the acidic component (polyacrylic acid) from the binder system while retaining the essential binding and adhesion functions through neutral or alkaline carbohydrate-based alternatives, thereby removing the corrosive effect on machinery
Solution Approach 2:
The patent introduces alkaline substances as intermediaries that neutralize the acidity of polyacrylic acid, allowing the binder to maintain its adhesion properties while the alkaline mediator prevents corrosion of machine parts by counteracting the acidic environment
3Strength
If polyacrylic acid binders are used, then the binder provides adequate binding strength, but the high viscosity makes application difficult and increases curing costs
Solution Approach 1:
The patent changes the physical parameters of the binder by using carbohydrate-based materials with inherently lower viscosity, improving sprayability and application ease while maintaining binding strength through optimized molecular structure and crosslinking mechanisms
4Reliability
If Maillard reaction-based binders are used, then the binder provides crosslinking and structural stability, but the reaction produces an undesirable dark brown color
Solution Approach 1:
The patent extracts and eliminates the Maillard reaction pathway from the binder system, removing the source of dark brown coloration while preserving the desired structural stability through alternative crosslinking mechanisms that do not produce discoloration
Solution Approach 2:
The patent introduces alternative crosslinking agents as intermediaries that provide structural stability and crosslinking functionality without undergoing the Maillard reaction, thereby preventing the formation of dark brown pigments while maintaining the structural integrity of the binder
5Object-generated harmful factors
If urea is added as a formaldehyde scavenger, then formaldehyde emissions are reduced, but the binder becomes unstable and requires on-site preparation
Solution Approach 1:
The patent extracts and eliminates urea from the binder formulation, removing the source of instability and crystalline precipitates while achieving formaldehyde emission reduction through the fundamental elimination of formaldehyde from the chemical system
Solution Approach 2:
The patent uses a stable, non-urea-based binder system that provides sufficient formaldehyde control without requiring on-site preparation, employing materials that remain stable during storage and transport while still achieving the environmental goal of reduced formaldehyde emissions
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 new binder composition addresses the challenges by being environmentally friendly, reducing formaldehyde emissions, preventing machine corrosion, and achieving a light color, while enhancing the insulation product's properties and manufacturing efficiency.
Implementation Method 1
The carbohydrate and crosslinking agent form a polyester thermoset resin
Implementation Method 2
at least one crosslinking agent
Implementation Method 3
a pre-reacted product of an alcohol or polyol and a monomeric or polymeric polycarboxylic acid
Data Source
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AI summary
An environmentally friendly, formaldehyde-free, aqueous binder composition that includes a carbohydrate, a crosslinking agent, and a pre-reacted product of an alcohol or polyol and monomeric or polymeric polycarboxylic acid or polyglycerol is provided. The pre-reacted product may include glycerol and esters of citric acid such a monoglyceryl citrate, diglyceryl citrate, and triglyceryl citrate as well as other higher molecular weight citric acid-based esters. The inclusion of the pre-reacted product in the binder composition helps to speed the crosslinking reaction, induces faster water evaporation, decreases the viscosity of the binder, helps to reduce the amount of water needed for application of the binder, decreases tackiness, and helps to achieve a maximum vertical expansion of the insulation pack in the transfer zone. The binder composition may be used in the formation of insulation materials and non-woven chopped strand mats.