Aqueous Thermosetting Binder Composition for Flexible Fibrous Substrates
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Solution Overview
Problem
Current formaldehyde-free binders for fibrous substrates lack the necessary flexibility and strength, particularly for applications requiring heat resistance and the ability to conform to varying temperatures and shapes, while also being environmentally friendly and cost-competitive with phenol/formaldehyde resins.
Innovation Solution
Aqueous thermosetting binder compositions comprising a polycarboxy (co)polymer and a glycerol derivative with a weight average molecular weight greater than 1000, specifically ethoxylated or propoxylated glycerol, which form a flexible and heat-resistant bond when cured, allowing for improved flexibility and strength without formaldehyde emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If commercial formaldehyde-free binders use known amine-free polyols such as glycerol or sorbitol, then high temperature color stability is improved, but flexibility and strength are insufficient
Solution Approach 1:
The patent changes the molecular weight parameter of the polyol from conventional low molecular weight (glycerol, sorbitol) to high molecular weight (greater than 1000), which fundamentally alters the flexibility and strength properties while maintaining color stability. This parameter change resolves the contradiction by finding a new operating point in the parameter space.
Solution Approach 2:
The patent creates a composite binder system combining polycarboxy (co)polymer with high molecular weight polyol, where the synergistic interaction between the two components provides both the color stability of amine-free systems and the flexibility/strength typically associated with amine-containing polyols. The composite nature allows properties to be combined that are mutually exclusive in single-component systems.
2Stability of the object's composition
If rigid binders are used in fibrous substrates, then compression recovery is improved, but flexibility for processing and installation is lost
Solution Approach 1:
The patent changes the flexibility parameter of the binder by using high molecular weight polyol, which provides a flexible cured network that can accommodate both compression recovery and bending flexibility. The molecular weight parameter adjustment allows the binder to exhibit viscoelastic behavior that satisfies both contradictory requirements.
3Productivity
If phenol/formaldehyde resins are used as binders, then cost and performance ratio is improved, but formaldehyde emissions and environmental hazards increase
Solution Approach 1:
The patent extracts and eliminates the formaldehyde component from the phenol/formaldehyde resin system, replacing it with alternative chemistry (polycarboxy (co)polymer and polyol esterification). This extraction removes the harmful factor while maintaining the essential binder function, achieving formaldehyde-free performance at competitive cost.
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 solution provides fibrous substrates with enhanced flexibility and strength, enabling them to withstand temperature fluctuations and shape changes without brittleness, while maintaining environmental safety and cost competitiveness with traditional binders.
Implementation Method 1
Existing commercial formaldehyde-free binders contain a carboxylic acid polymer and a polyol that esterify and form a thermoset when heat cured
Implementation Method 2
a cured thermosetting resinous material... while still hot from drawing, are sprayed with an aqueous binder which is dried and cured
Data Source
AI summary
A curable composition useful as a thermosetting binder, comprising a polycarboxy polymer or copolymer, a glycerol derivative, and, optionally, a phosphorous containing compound.