Formaldehyde-Free Binder for Spunbond Polyester Mats
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Solution Overview
Problem
Spunbond polyester mats require formaldehyde-free binders that maintain tensile and tear strength while achieving thermal dimensional stability above 180°C, as existing formaldehyde-free binders often compromise on performance or processing ease.
Innovation Solution
A binder composition using an amine salt of an inorganic acid, such as phosphoric acid, combined with an aldehyde like glucose, which forms a water-insoluble polymer upon curing, providing strong adhesion and thermal stability without formaldehyde.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If formaldehyde-free binders are used, then environmental safety is improved, but thermal dimensional stability above 180°C deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the binder by using amine salts of inorganic acids (such as phosphoric acid, sulfuric acid, or carboxylic acids) combined with aldehydes or ketones. This parameter change allows the binder to achieve both formaldehyde-free formulation and adequate thermal dimensional stability at temperatures above 180°C, resolving the contradiction between environmental safety and thermal performance
Solution Approach 2:
The invention creates a composite binder system combining amine salts with aldehydes or ketones. This composite approach enables the binder to simultaneously provide formaldehyde-free composition and sufficient thermal stability, eliminating the need for fiberglass scrim reinforcement in many applications
2Object-affected harmful factors
If formaldehyde-free binders are used, then environmental safety is improved, but tensile and tear strength deteriorate
Solution Approach 1:
The invention modifies the binder composition parameters by selecting specific amine salts (from strong inorganic acids with pKa ≤ 9.5) and controlling the molar ratios of acid to amine (1:25 to 25:1, preferably 1:5 to 5:1). These parameter changes enable the formaldehyde-free binder to achieve tensile and tear strength comparable to formaldehyde-based binders
Solution Approach 2:
The invention creates a formaldehyde-free binder system that copies the functional performance of traditional formaldehyde-based binders. By using amine salt-aldehyde/ketone combinations with controlled curing conditions, the binder replicates the crosslinking and bonding capabilities of formaldehyde systems without the harmful formaldehyde content
3Object-affected harmful factors
If formaldehyde-free binders are used, then environmental safety is improved, but processing difficulty increases
Solution Approach 1:
The invention optimizes processing parameters including curing temperature (100-300°C, preferably 150-250°C), curing time (5-60 minutes), and binder concentration (0.5-50 wt% of fibers). These parameter adjustments make the formaldehyde-free binder as easy to process as conventional binders, eliminating processing difficulties
Solution Approach 2:
The amine salt-aldehyde/ketone binder system is self-curing through thermal activation. The binder automatically crosslinks when exposed to curing temperatures, eliminating the need for additional catalysts or complex processing steps. This self-service characteristic simplifies manufacturing and improves ease of processing
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 system achieves comparable tensile and tear strength to formaldehyde-based binders, with improved thermal dimensional stability and processing ease, while being environmentally safer and more economically favorable, using renewable raw materials.
Implementation Method 1
an amine salt of an inorganic acid, wherein the amine is a di- or multifunctional primary or secondary amine. An aldehyde is added to the salt to form a composition which upon curing is capable of forming a water-insoluble polymer
Data Source
AI summary
Provided are non-woven of synthetic polymer, in particular spunbond polyester mats, using an improved curable composition. Such curable composition comprises the reaction product of an aldehyde or ketone and an amine salt of an inorganic acid. The composition when applied to non-woven of synthetic polymer, in particular to spunbond polyester continuous filaments, is cured to form a water-insoluble polymer binder which exhibits good adhesion and thermodimensional stability.