Self-Adhering Bituminous Sealing Element Low-Temperature Bonding
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Solution Overview
Problem
Self-adhering bitumen membranes used in construction face challenges at low temperatures, with limited tack and inability to adhere to wet/humid substrates, requiring additional heating and complex installation processes.
Innovation Solution
A self-adhering bitumen-based sealing element with a waterproofing adhesive layer composed of a self-adhering bituminous composition and a non-bituminous pressure-sensitive adhesive, providing effective bonding at temperatures below 10°C without the need for additional heating and allowing installation on wet/humid substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-adhering bitumen membranes are used for sealing, then good resistance against environmental factors and low cost are achieved, but limited tack at low temperatures and inability to adhere to wet substrates occur
Solution Approach 1:
The invention uses a composite adhesive system combining bituminous adhesive (for waterproofing and environmental resistance) with polymeric pressure-sensitive adhesive (for low-temperature tack and wet substrate adhesion). This composite approach allows the sealing element to maintain bitumen's environmental resistance while adding polymeric adhesive's low-temperature performance.
Solution Approach 2:
The invention modifies the adhesive properties by changing the chemical composition parameters of the adhesive layer, specifically incorporating polymeric pressure-sensitive adhesives with specific glass transition temperatures and molecular weights to achieve low-temperature tack while maintaining waterproofing performance.
2Reliability
If self-adhering bitumen membranes are used, then low cost is achieved, but additional heating and complex installation processes are required
Solution Approach 1:
The dual-adhesive system combines the waterproofing benefits of bitumen with the ease-of-application benefits of pressure-sensitive adhesives, eliminating the need for heating equipment and complex installation procedures while maintaining reliable bonding performance.
Solution Approach 2:
The pressure-sensitive adhesive component allows the membrane to be applied through simple peeling and sticking without requiring external heating equipment or complex installation machinery, enabling workers to self-install the product easily.
3Ease of manufacture
If self-adhering bitumen membranes are used, then cost-effectiveness is achieved, but inability to bond to wet substrates occurs
Solution Approach 1:
The invention creates a composite adhesive system where the polymeric pressure-sensitive adhesive component provides the ability to bond to wet and humid substrates, while the bituminous component maintains cost-effectiveness and waterproofing performance.
Solution Approach 2:
The adhesive layer is designed to perform multiple functions: providing low-temperature tack, enabling wet substrate adhesion, and maintaining cost-effectiveness, making the sealing element versatile for various installation conditions without increasing cost.
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 solution offers a cost-effective, easy-to-install sealing solution with high tack at low temperatures, eliminating the need for open-flame torches and enabling bonding to substrates regardless of moisture levels, thus enhancing operational safety and efficiency.
Implementation Method 1
An adhesive layer (3) covering at least a portion of the first major surface of the waterproofing adhesive layer (2), wherein the adhesive layer (3) is composed of a non-bituminous pressure sensitive adhesive
Implementation Method 2
a waterproofing adhesive layer (2) composed of a self-adhering bituminous composition
Data Source
AI summary
A sealing element includes: a waterproofing adhesive layer having first and second major surfaces, an adhesive layer covering at least a portion of the first major surface of the waterproofing adhesive layer, and a carrier layer on the side of the waterproofing adhesive layer opposite to the side of the adhesive layer, wherein the waterproofing adhesive layer is composed of a self-adhering bituminous composition and the adhesive layer is composed of a non-bituminous pressure sensitive adhesive. The sealing element is used as a waterproofing, roofing, vapor barrier, vapor retarder, or a façade membrane, or as a waterproofing, roofing tape, or façade tape.