Aqueous Binder Composition for Formaldehyde-Free Insulation
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Solution Overview
Problem
There is a need for an environmentally friendly, formaldehyde-free binder composition for insulation products that maintains comparable mechanical and physical properties without undesirable emissions, such as discoloration, hot/humid performance issues, stiffness, bond strength, and processability challenges.
Innovation Solution
An aqueous binder composition comprising at least 35 wt. % of a cross-linking agent with carboxylic acid groups, 0.1 to 50.0 wt. % of long-chain polyol with a molecular weight of at least 2,000 Daltons, and optionally short-chain polyol with a molecular weight less than 2,000 Daltons, with a balanced ratio of molar equivalents of carboxylic acid groups to hydroxyl groups and long-chain to short-chain polyol ratios, to achieve optimal mechanical and physical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If formaldehyde-based binder compositions are used, then mechanical and physical properties are achieved, but undesirable emissions and discoloration occur
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by using polyol and polycarboxylic acid systems instead of formaldehyde-based resins. This substitution maintains the cross-linking mechanism and mechanical properties while eliminating formaldehyde emissions and discoloration issues associated with traditional phenol-formaldehyde and PUF binders.
Solution Approach 2:
The invention creates a composite binder system combining polyol, polycarboxylic acid, and optional additives to achieve the desired balance of mechanical properties, water solubility, and environmental performance. This composite approach allows optimization of multiple properties simultaneously without relying on formaldehyde-based chemistry.
2Object-affected harmful factors
If formaldehyde-free formulations are developed, then emissions are reduced, but mechanical and physical properties deteriorate
Solution Approach 1:
The patent optimizes the molecular weight, hydroxyl value, and carboxylic acid content parameters to ensure adequate cross-linking density and bond strength. By carefully selecting polyol and polycarboxylic acid components with appropriate parameters, the formulation achieves bond strength comparable to formaldehyde-based binders without compromising mechanical performance.
3Object-affected harmful factors
If formaldehyde-free formulations are developed, then emissions are reduced, but discoloration and hot/humid performance issues occur
Solution Approach 1:
The patent adjusts the chemical structure parameters of the polyol and polycarboxylic acid to improve thermal and moisture stability. The selected components demonstrate resistance to degradation under hot/humid conditions and maintain compositional stability without the discoloration and performance deterioration associated with alternative formaldehyde-free binders.
4Strength
If binder composition is optimized for mechanical properties, then bond strength is improved, but water solubility increases
Solution Approach 1:
The patent optimizes the molecular weight and functional group density parameters of the polyol and polycarboxylic acid to achieve the desired balance. By selecting components with appropriate parameters and controlling the cross-linking density, the formulation achieves adequate bond strength while limiting water-soluble material to 6.0 wt. % or less after curing.
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 comparable or improved mechanical and physical performance to traditional formaldehyde-based binders, with reduced water solubility and enhanced tensile strength, flexibility, and resistance to hot/humid conditions.
Implementation Method 1
aqueous binder composition comprising at least 35 wt. % of a cross-linking agent comprising at least two carboxylic acid groups, 0.1 to 50.0 wt. % of at least one long-chain polyol having at least two hydroxyl groups
Implementation Method 2
The blanket containing the binder-coated fibers is then passed through a curing oven and the binder is cured to set the blanket to a desired thickness
Data Source
AI summary
An aqueous binder composition is disclosed that comprises at least one long-chain polyol having at least two hydroxyl groups and a number average molecular weight of at least 2,000 Daltons; a primary cross-linking agent comprising at least two carboxylic acid groups; and a secondary cross-linking agent comprising a short-chain polyol having at least two hydroxyl groups and a number average molecular weight less than 2,000 Daltons.