Aqueous Binder Composition for Fibrous Substrates
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Solution Overview
Problem
Existing binders for fibrous and granular substrates often emit formaldehyde, and while alternatives have been proposed, they either require costly preparation or do not adequately meet mechanical property requirements such as breaking strength and heat resistance.
Innovation Solution
An aqueous binder composition comprising a polymer constructed from specific monoethylenically unsaturated compounds and lignin, with a glass transition temperature in the range of 10-50°C, which is used to produce bituminized roofing membranes with improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If crosslinkers giving off formaldehyde are used to increase strength and heat resistance, then breaking strength and heat resistance are improved, but formaldehyde emissions increase
Solution Approach 1:
The invention changes the chemical composition parameters by using a polymer with specific glass transition temperature (10-50°C) and controlled functional groups (carboxyl, hydroxyl, amino) combined with lignin in specific ratios, achieving crosslinking without formaldehyde-emitting crosslinkers
Solution Approach 2:
The invention creates a composite binder system combining synthetic polymer P with natural lignin compound L, where the synergistic interaction between these components provides both binding strength and heat resistance without requiring formaldehyde-based crosslinkers
2Object-generated harmful factors
If alternatives to formaldehyde crosslinkers are used to avoid formaldehyde emissions, then formaldehyde emissions are reduced, but breaking strength and heat resistance deteriorate
Solution Approach 1:
The invention optimizes the glass transition temperature of polymer P to be between 10-50°C and controls the content of functional groups (carboxyl 0.1-10 mmol/g, hydroxyl 0.1-10 mmol/g, amino 0.1-5 mmol/g) to achieve adequate reactivity and binding strength without formaldehyde
Solution Approach 2:
The invention replicates the crosslinking function of formaldehyde-based systems through alternative chemical mechanisms, where lignin compounds and polymer functional groups form crosslinked networks through condensation reactions, achieving similar mechanical properties without harmful emissions
3Object-generated harmful factors
If existing formaldehyde-free binder alternatives are used, then formaldehyde emissions are reduced, but preparation complexity and cost increase
Solution Approach 1:
The invention makes polymer P multi-functional by incorporating multiple types of functional groups (carboxyl, hydroxyl, amino) that can participate in various reactions with lignin and substrates, simplifying the overall binder system by eliminating the need for separate crosslinking agents and accelerators
Solution Approach 2:
The binder composition is designed to be self-sufficient, where the polymer and lignin components mutually provide the necessary reactive groups for crosslinking and binding, eliminating the need for additional crosslinkers, catalysts, or reaction accelerators that complicate preparation
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 enhanced breaking strength and heat resistance for fibrous and granular substrates, particularly in fiber webs, while being formaldehyde-free or reducing formaldehyde emissions.
Implementation Method 1
binders are in many cases used that comprise crosslinkers which give off formaldehyde
Implementation Method 2
a polymer P constructed from ≧0.1 and ≦10 wt % of at least one monoethylenically unsaturated compound having at least one silicon-containing group, an epoxy, hydroxyalkyl, N-methylol or carbonyl group
Implementation Method 3
The invention further embraces the use of the aqueous binder composition as binder for granular and/or fibrous substrates
Data Source
AI summary
Aqueous binder composition for granular and/or fibrous substrates, where the binder contains i) a copolymer constructed from ethylenically unsaturated monomers; and ii) lignin.