Bituminous membranes with biodegradable binder
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Solution Overview
Problem
Existing nonwoven carriers for bituminous membranes lack stability and mechanical properties, especially at high temperatures, due to the degradation of polymer binders, and often require crosslinkers that are environmentally harmful and costly, making them unsuitable for large-scale, automated production.
Innovation Solution
A nonwoven carrier consolidated with a binder comprising starch and polyvinyl alcohol without a crosslinker, which provides high mechanical resistance and dimensional stability at both room and elevated temperatures, enabling efficient production of bituminous membranes in an automated process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polymer binders are used to consolidate nonwoven carriers, then mechanical resistance and dimensional stability are improved, but the binders degrade at high temperatures (180°C-200°C) during bitumen impregnation, causing loss of stability
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by using starch and polyvinyl alcohol in specific ratios (starch: 5-95 wt%, PVA: 5-95 wt%) to achieve high-temperature stability. This compositional parameter change allows the binder to maintain mechanical properties at bitumen impregnation temperatures of 180°C-200°C without degradation
Solution Approach 2:
The patent creates a composite binder system combining starch and polyvinyl alcohol with specific physical-chemical property relationships. The synergistic interaction between these two materials provides both mechanical resistance and thermal stability, resolving the contradiction between strength and high-temperature reliability
2Reliability
If crosslinkers are added to enhance binder stability, then mechanical properties and dimensional stability are improved, but environmental harm and production cost increase
Solution Approach 1:
The patent extracts and eliminates the crosslinker component from the binder system while maintaining dimensional stability through the starch-PVA composite. This removal of the harmful substance (crosslinker) resolves the contradiction between reliability and environmental harm
Solution Approach 2:
The patent uses biodegradable starch and polyvinyl alcohol that can replace expensive and environmentally harmful crosslinkers. The binder system achieves stability without requiring additional chemical additives, reducing both cost and environmental impact
3Strength
If crosslinkers and fillers are used to improve binder performance, then mechanical stability is enhanced, but production complexity and cost increase
Solution Approach 1:
The patent extracts and removes crosslinkers and fillers from the binder composition, achieving mechanical stability through the simplified starch-PVA system. This reduction in compositional elements directly addresses the contradiction between strength and complexity
Solution Approach 2:
The patent optimizes the weight ratio parameters of starch and polyvinyl alcohol to achieve maximum mechanical stability without additional additives. By carefully controlling these compositional parameters, the patent maintains strength while minimizing complexity
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 crosslinker-free starch/polyvinyl alcohol binder system enhances the mechanical properties and dimensional stability of nonwoven carriers, allowing for high-quality bituminous membrane production with reduced environmental impact and lower production costs, suitable for large-scale industrial use.
Implementation Method 1
a nonwoven carrier comprising a nonwoven consolidated with a binder, wherein the binder comprises starch and polyvinyl alcohol
Data Source
AI summary
Subject of the invention is a nonwoven carrier, wherein the nonwoven comprises organic polymer fibers and is consolidated with an aqueous binder, wherein the binder comprises (a) starch (b) polyvinyl alcohol, which may comprise up to 5 mol.% of other monomer units, wherein (c) the binder does not comprise a crosslinker, and (d) the binder does not comprise a filler. Subject of the invention are also uses of the nonwoven carrier, production methods, bituminous membranes and building materials.