Method of preparing elastomer membrane with high water pressure resistance
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Solution Overview
Problem
Conventional thermoplastic polyurethane (TPU) membranes lack sufficient water pressure resistance, adhesion, and elasticity, leading to delamination and permeability issues when attached to textiles under high water pressure.
Innovation Solution
A method involving a three-layer laminated TPU membrane structure, where each layer is chemically modified with a mixture of diethylenetriamine, diethylaminopropylamine, and diaminodiphenylmethane, and an initiator, to enhance water pressure resistance, adhesion, and elasticity by grafting modifying molecule chains to TPU polymer chains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional laminated TPU membrane is used to provide basic waterproofing, then the membrane structure is simple and easy to manufacture, but the water pressure resistance is insufficient and the membrane becomes permeable under high water pressure
Solution Approach 1:
The patent modifies the chemical composition parameters of TPU by incorporating polyol compounds with specific molecular weights (500-5000) and isocyanate compounds (1,3-propanesultone, 5-isoxazolidinone-3-one) to enhance water pressure resistance. This chemical parameter modification allows the membrane to maintain reliability under high water pressure without requiring overly complex structural designs.
Solution Approach 2:
The patent creates a composite TPU membrane system by combining multiple chemical components: polyol compounds, isocyanate compounds, and TPU base material. This composite approach achieves superior water pressure resistance through synergistic material interactions, balancing improved reliability with manageable manufacturing complexity.
2Reliability
If a conventional TPU membrane is used for adhesive attachment to fabric, then the adhesion is temporary and based only on polymer chain bonding, but the manufacturing process is simple, resulting in easy peeling and delamination
Solution Approach 1:
The patent changes the chemical parameters of TPU by incorporating specific functional groups through polyol and isocyanate compounds. These chemical modifications create stronger intermolecular bonding capabilities, transforming the adhesion mechanism from temporary physical bonding to more durable chemical bonding, thereby improving reliability without excessive complexity.
Solution Approach 2:
The patent applies local quality enhancement by concentrating adhesive functional groups at the membrane-fabric interface through selective use of isocyanate compounds. This localized chemical modification strengthens the bonding zone specifically where adhesion is needed, improving overall adhesion strength while keeping the rest of the membrane structure relatively simple.
3Reliability
If a conventional TPU membrane is used for textile attachment, then the elasticity is low, but the manufacturing is straightforward, causing the membrane to fail to completely cover fibers and compromising waterproofness
Solution Approach 1:
The patent modifies the elastic parameters of TPU by selecting polyol compounds with specific molecular weights (500-5000) and incorporating isocyanate compounds that enhance polymer chain flexibility. These parameter changes improve the membrane's ability to conform to fiber surfaces, ensuring complete coverage and reliable waterproofness while maintaining reasonable manufacturing complexity.
4Stability of the object's composition
If the TPU membrane layers are laminated to form a sandwich structure, then the basic membrane structure is achieved, but the layers undergo phase separation and delamination due to inadequate adhesion
Solution Approach 1:
The patent changes the chemical composition parameters of the TPU layers by incorporating compatible polyol and isocyanate compounds across all layers. This chemical parameter harmonization reduces phase separation tendencies and improves interlayer adhesion, enhancing structural integrity while keeping the laminated structure relatively simple to manufacture.
Solution Approach 2:
The patent promotes homogeneity across the laminated layers by using consistent chemical modifications (polyol and isocyanate compounds) throughout all TPU layers. This homogeneous chemical composition reduces interlayer incompatibility and phase separation, improving structural stability without significantly increasing manufacturing 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 modified TPU membrane exhibits significantly improved water pressure resistance, adhesion, and elasticity, with the second membrane layer providing high-density TPU polymer chains to prevent water penetration and maintain structural integrity.
Implementation Method 1
the resulting membrane features structural integrity, has a uniform thickness, and is enhanced in water pressure resistance, adhesion, and elasticity when compared with the prior art
Implementation Method 2
preparing a second mixture by mixing an initiator thoroughly with the first mixture
Implementation Method 3
preparing a dry material by subjecting first TPU powder/particles to a drying treatment at 70°C～85°C
Data Source
AI summary
A method of preparing an elastomer membrane with high water pressure resistance includes the following steps: preparing a dry material by subjecting first thermoplastic polyurethane (TPU) powder/particles to a drying treatment; preparing a first mixture by mixing the dry material thoroughly with one or a mixture of at least two of diethylenetriamine, diethylaminopropylamine, and diaminodiphenylmethane; preparing a second mixture by mixing an initiator thoroughly with the first mixture; preparing a first membrane layer from the second mixture; and preparing a second membrane layer and a third membrane layer through the above steps such that the second membrane layer and the third membrane layer are sequentially formed on the first membrane layer.