Base Interlining Binder Composition for Heat-Stable Roofing Fabrics
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Solution Overview
Problem
Textile fabrics used as base interlinings for roofing membranes lack sufficient mechanical stability, heat stability, and fire resistance, while existing improvements increase manufacturing costs.
Innovation Solution
A binder system comprising 10-90 wt% of an aqueous dispersion of polymerizates based on conjugated aliphatic dienes and vinyl aromatic compounds, 90-10 wt% starch, and up to 10 wt% additives, which enhances heat dimensional stability and maintains flexibility and ageing characteristics without increasing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional binder systems are used to bond non-woven fabrics and reinforcement fibers, then mechanical stability is improved, but heat dimensional stability deteriorates
Solution Approach 1:
The invention uses a composite binder system combining starch (natural polymer) with synthetic polymer dispersion (acrylonitrile-butadiene-styrene copolymer). This composite approach leverages the heat stability of starch and the bonding effectiveness of the synthetic polymer, achieving both mechanical stability and heat dimensional stability that neither component could achieve alone.
2Strength
If more synthetic polymer binder is used to improve bonding strength, then mechanical stability is improved, but cost increases and environmental friendliness deteriorates
Solution Approach 1:
The invention replaces expensive synthetic polymer binders with starch, a cheap and readily available natural material. While starch alone has limitations, its combination with a small amount of synthetic polymer creates an effective binder system that is both cost-competitive and environmentally friendly, eliminating the need for formaldehyde-based treatments.
3Ease of manufacture
If starch is used as binder to reduce cost and improve environmental properties, then cost decreases and environmental friendliness improves, but heat dimensional stability and ageing characteristics deteriorate
Solution Approach 1:
The invention creates a composite binder where starch serves as the primary component for cost-effectiveness and environmental compatibility, while the synthetic polymer dispersion (10-90 wt%) provides the necessary heat dimensional stability and bonding strength. This synergistic combination overcomes the limitations of starch alone.
4Strength
If conventional binder systems are used to achieve adequate bonding, then mechanical stability is improved, but flexibility and ageing characteristics deteriorate
Solution Approach 1:
The invention modifies the binder system parameters by using a specific ratio of starch to synthetic polymer dispersion (10-90 wt% synthetic polymer), and controlling the polymer dispersion composition (acrylonitrile 20-80 parts, butadiene 20-80 parts, styrene 20-80 parts). These parameter optimizations ensure adequate bonding strength while maintaining flexibility and improving ageing characteristics.
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 significantly improves heat dimensional stability and maintains flexibility and ageing characteristics, achieving cost savings by partly using starch, and results in a formaldehyde-free binder system with improved product properties.
Implementation Method 1
The non-woven fabric and the reinforcing fibers are bonded according to this state of the art either by conglutinating with a binding agent
Implementation Method 2
textile fabrics being solidified by means of a special binder system
Implementation Method 3
with the figures for the percentage by weight relating to the dry mass of the binder system, i.e. without water
Data Source
AI summary
The invention relates to a novel binder system and its use for bonding textile fabrics as well as products containing such bonded textile fabrics. The materials according to the invention are suitable for manufacturing base interlinings which may be used for manufacturing base interlinings for sarking, roofing and sealing membranes, particularly for manufacturing coated sarking, roofing and sealing membranes.