Formaldehyde-Free Fiber Composite Binder for Moisture Resistance

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Solution Overview

Problem

Formaldehyde-based binders used in composite fiber products are being replaced due to health and environmental concerns, but existing formaldehyde-free alternatives often rely on petroleum-based ingredients and suffer from brittleness, particulate formation, and moisture sensitivity, necessitating improved stability and water resistance.

Innovation Solution

Development of binder compositions incorporating carbohydrates and crosslinking agents formed from the reaction products of urea compounds and aldehyde-containing compounds, such as 4,5-dihydroxyimidazolidin-2-one, which crosslink reducing sugars to create a polymeric matrix for fiber composites, enhancing stability and water resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If formaldehyde-based binders are replaced with formaldehyde-free alternatives, then health and environmental safety is improved, but binder performance and stability deteriorate

Engineering Contradiction:

Improveformaldehyde contentVSAvoidbinder stability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters by using urea-aldehyde reaction products with controlled molecular weight and substitution patterns, along with specific phenolic compounds, to achieve both low formaldehyde content and high binder stability. The molecular weight parameters of the polycondensate are carefully controlled to optimize performance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite binder system combining urea-aldehyde reaction products with phenolic compounds, synergistically achieving formaldehyde reduction while maintaining or improving binder reliability. The composite structure allows each component to contribute its strengths.

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If carbohydrate-containing binders are used as renewable alternatives, then petroleum-based ingredient use is reduced, but brittleness and particulate formation increase

Engineering Contradiction:

Improvepetroleum-based ingredient contentVSAvoidbinder flexibility

Core Design Contradiction:

Quantity of substanceVSStrength

Solution Approach 1:

The patent modifies the chemical structure parameters of the binder by incorporating phenolic compounds and controlling the polycondensate molecular weight, which prevents the brittleness typically associated with carbohydrate-based binders while maintaining renewable content benefits.

Inventive Principle:

Principle #35Parameter changes

3Quantity of substance

If carbohydrate-containing binders are used as renewable alternatives, then petroleum-based ingredient use is reduced, but moisture resistance deteriorates

Engineering Contradiction:

Improvepetroleum-based ingredient contentVSAvoidmoisture resistance

Core Design Contradiction:

Quantity of substanceVSStability of the object's composition

Solution Approach 1:

The invention combines carbohydrate-based polycondensates with phenolic compounds to create a composite binder that achieves both renewable content and superior moisture resistance. The phenolic component provides the necessary hydrophobicity and stability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes the molecular weight and chemical composition parameters of the polycondensate to enhance moisture resistance while maintaining renewable content, achieving stability comparable to or exceeding conventional binders.

Inventive Principle:

Principle #35Parameter changes

4Object-affected harmful factors

If binder composition is simplified to eliminate formaldehyde, then environmental safety is improved, but water resistance and stability deteriorate

Engineering Contradiction:

Improveformaldehyde contentVSAvoidwater resistance

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

The patent creates a composite binder system using urea-aldehyde reaction products combined with phenolic compounds, achieving formaldehyde elimination while simultaneously providing enhanced water resistance and stability through the synergistic interaction of components.

Inventive Principle:

Principle #40Composite materials

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 proposed binder compositions demonstrate improved tensile strength, reduced leaching of ions, and enhanced moisture resistance, comparable to or exceeding conventional petroleum-based binders, while being free from formaldehyde and using renewable materials.

Implementation Method 1

the crosslinking agent crosslinks the reducing sugar to form a polymeric matrix that adheres the fibers together in the fiber-containing composite

Methodology Applied

Scientific EffectCrosslinking: Chemical Bonding

Data Source

PatentUS11142631B2Formaldehyde free binder compositions with urea-aldehyde reaction products

Publication Date: 2021.10.12 JOHNS MANVILLE CORP

AI summary

Fiber-containing composites are described that contain woven or non-woven fibers, and a cured binder formed from a binder composition that includes (1) a reducing sugar and (2) a crosslinking agent that includes a reaction product of a urea compound and a polycarbonyl compound. Exemplary reaction products for the crosslinking agent may include the reaction product of urea and an α,β-bicarbonyl compound or an α,γ-bicarbonyl compound. Exemplary fiber-containing composites may include fiberglass insulation.