Starch-Polymer Binder Composition for Heat-Stable Textile Interlinings
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Solution Overview
Problem
Existing textile fabrics used as base interlinings for roofing membranes lack sufficient mechanical stability, heat stability, and resistance to fire, while maintaining cost-effectiveness and flexibility, and there is a need for improved manufacturing methods that do not compromise these properties.
Innovation Solution
A binder system comprising 10 to 90 wt% of an aqueous dispersion of polymerisates based on conjugated aliphatic dienes and vinyl aromatic compounds, 90 to 10 wt% starch, and up to 10 wt% additives is used to solidify textile fabrics, enhancing heat dimensional stability and maintaining flexibility and stability despite water absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If non-woven fabrics are combined with reinforcement fibers and bonded by conglutinating or needle-punching, then mechanical stability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines synthetic non-woven fabric and natural fiber reinforcement (jute, hemp, flax) into a single composite structure where both materials work together to provide mechanical stability. The binder system merges bonding functionality with heat resistance, eliminating the need for separate bonding and heat treatment processes.
Solution Approach 2:
The invention uses composite materials by combining synthetic polymer fibers with natural fiber reinforcements in a single non-woven structure. This composite approach provides both the mechanical stability of synthetic fibers and the reinforcement benefits of natural fibers, while the starch-based binder复合with polymer dispersion creates a multi-functional bonding system.
2Ease of manufacture
If conventional binders are used to bond non-woven fabrics, then manufacturing is simplified, but heat dimensional stability deteriorates
Solution Approach 1:
The binder system is a composite material combining starch (natural polymer) with polymer dispersion (synthetic polymer) and crosslinking agents. This composite binder provides both the ease of application of conventional binders and superior heat dimensional stability through the synergistic effects of starch gelation and polymer crosslinking.
Solution Approach 2:
The binder system undergoes parameter changes during processing: starch gelates upon heating, polymer dispersion forms a continuous matrix, and crosslinking agents create thermally stable networks. These parameter changes (temperature, moisture content, crosslink density) transform the binder from an applied slurry to a stable, heat-resistant bonding matrix.
3Quantity of substance
If starch is used as binder, then cost is reduced and biodegradability improved, but heat stability and mechanical strength deteriorate
Solution Approach 1:
The patent merges starch with polymer dispersion and crosslinking agents to create a hybrid binder system. The starch provides cost effectiveness and biodegradability, while the polymer dispersion and crosslinking agents compensate for starch's limitations in heat stability and mechanical strength, creating a synergistic combination.
Solution Approach 2:
The binder system undergoes parameter changes during processing: starch gelates upon heating, polymer dispersion forms a continuous matrix, and crosslinking agents create thermally stable networks. These parameter changes (temperature, moisture content, crosslink density) transform the binder from an applied slurry to a stable, heat-resistant bonding matrix.
4Strength
If higher binder content is used to improve mechanical stability, then strength increases, but flexibility and water absorption characteristics deteriorate
Solution Approach 1:
The binder system undergoes parameter changes during processing: starch gelates upon heating, polymer dispersion forms a continuous matrix, and crosslinking agents create thermally stable networks. These parameter changes (temperature, moisture content, crosslink density) transform the binder from an applied slurry to a stable, heat-resistant bonding matrix.
Solution Approach 2:
The binder is applied selectively to specific areas where bonding is required rather than uniformly across the entire fabric surface. This localized application maintains flexibility in non-bonded areas while providing sufficient mechanical stability at bonding points, optimizing the balance between strength and flexibility.
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 improves heat dimensional stability by up to 20% in both longitudinal and cross directions, maintains flexibility, and reduces manufacturing costs without compromising product properties, offering improved mechanical stability and resistance to fire.
Implementation Method 1
a) 10 to 90 wt % of an aqueous dispersion of polymerisates based on conjugated aliphatic dienes and vinyl aromatic compounds
Implementation Method 2
b) 90 to 10 wt % starch
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.