Formaldehyde-free aqueous curable composition
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Solution Overview
Problem
Traditional binders used in textiles and nonwovens, containing N-Methylolacrylamide, release formaldehyde upon heating, lacking formaldehyde-free alternatives with excellent water resistance and solvent resistance.
Innovation Solution
A formaldehyde-free aqueous curable composition is developed, comprising a polymer mixture of C1-C10 alkyl acrylate, vinylaromatics, ethylenically unsaturated compounds with multiple carboxylic acid groups, and a titanium catalyst, which accelerates the curing process and enhances performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If N-Methylolacrylamide containing binders are used to achieve excellent water resistance and solvent resistance, then wet strength and IPA strength are improved, but formaldehyde is released upon heating
Solution Approach 1:
The patent removes N-Methylolacrylamide from the binder formulation to eliminate formaldehyde release, while compensating for performance loss through alternative monomer combinations (acrylic acid, itaconic acid, maleic acid) and titanium catalyst system that together provide the required water and solvent resistance without harmful emissions
Solution Approach 2:
The patent changes the chemical composition parameters by replacing NMA-based monomers with carboxylic acid-containing monomers and introducing titanium catalyst, fundamentally altering the curing mechanism from NMA crosslinking to carboxylic acid-titanium catalyzed crosslinking, thereby achieving formaldehyde-free performance while maintaining reliability
2Object-generated harmful factors
If formaldehyde-free alternative binders are used to eliminate formaldehyde release, then harmful emissions are reduced, but water resistance and solvent resistance performance deteriorates
Solution Approach 1:
The patent creates a composite binder system combining multiple carboxylic acid-containing monomers (acrylic acid, itaconic acid, maleic acid) with titanium catalyst, where the synergistic interaction between these components produces water and solvent resistance performance comparable to or exceeding traditional NMA binders, while maintaining formaldehyde-free status
Solution Approach 2:
The titanium catalyst acts as an intermediary that enables efficient crosslinking of carboxylic acid-containing monomers, facilitating the formation of a robust polymer network that provides excellent water and solvent resistance without requiring N-Methylolacrylamide, thus bridging the performance gap between formaldehyde-free and traditional binders
3Reliability
If traditional curing processes are used for formaldehyde-free binders, then curing is achieved, but curing speed is slow and performance is insufficient
Solution Approach 1:
The patent introduces titanium catalyst to fundamentally change the curing kinetics parameters, accelerating the crosslinking reaction of carboxylic acid-containing monomers from slow traditional rates to fast efficient curing, thereby simultaneously improving both curing speed and final performance
Solution Approach 2:
The titanium catalyst functions as a strong catalytic agent that dramatically accelerates the crosslinking reaction rate, analogous to using a strong oxidant to speed up a chemical reaction, enabling rapid curing while achieving excellent water and solvent resistance in the cured binder system
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 composition achieves excellent water resistance and solvent resistance without formaldehyde release, improving wet and IPA strength properties.
Implementation Method 1
the introduction of a titanium catalyst, which is widely used in the synthesis of polyester, to an acrylate binder system can speed up curing process
Data Source
AI summary
The present disclosure relates to a formaldehyde-free aqueous curable composition comprising: A) a polymer polymerized from a monomer mixture comprising (a) 30-90 wt % of C1-C10 alkyl acrylate; (b) 10-60 wt % of vinylaromatics; (c) 0.5-10 wt % of an ethylenically unsaturated compound having at least two carboxylic acid groups; (d) 0-10 wt % of an ethylenically unsaturated acid having one carboxylic acid group; (e) 0-5 wt % of other ethylenically unsaturated monomers; wherein the percentages are based on the total weight of the monomer mixture; and B) a titanium catalyst.