Edifice sealing web, and process for manufacturing same
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Solution Overview
Problem
Existing edifice sealing webs face issues with migration of softening agents into covered surfaces and bitumen migration out of sealing membranes, leading to brittleness, loss of flexibility, and discoloration, which affects the mechanical and aging properties of roofing materials.
Innovation Solution
A multilayer edifice sealing web with a polymeric softening agent-based sealing web, a barrier layer composed of homopolyamides and copolyamides, and a self-adhesive layer, where the barrier layer is applied to prevent interaction between the sealing web and bitumen, reducing migration and ensuring adhesion without direct contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing web made of plastic sheeting (PVC-P-NB) is used, then it provides good sealing performance, but softening agents migrate into the bitumen layer causing brittleness and loss of flexibility
Solution Approach 1:
A barrier layer made of polyamide (PA 6, PA 6.6, or PA 12) is introduced between the plastic sealing web and the bitumen layer. This intermediary layer prevents direct contact and stops the migration of softening agents from the plastic into the bitumen, while still allowing the sealing web to perform its sealing function effectively.
Solution Approach 2:
The invention creates a composite structure consisting of multiple layers: the plastic sealing web layer, the polyamide barrier layer, and the bitumen layer. This composite material system combines the advantages of each individual material while mitigating their incompatibilities, achieving both sealing performance and chemical stability.
2Temperature
If light-colored sheeting is used to minimize heating, then it reduces thermal absorption, but discolorations occur due to bitumen oil migration
Solution Approach 1:
The polyamide barrier layer serves as a protective intermediary between the light-colored sealing web and the bitumen layer. It prevents bitumen oils from migrating onto the surface of the sealing web, thereby maintaining the light color and aesthetic appearance while still allowing the material to minimize thermal absorption.
3Ease of manufacture
If direct installation on EPS insulation is performed, then it simplifies installation, but volatile components migrate causing brittleness and dimensional instability
Solution Approach 1:
The polyamide barrier layer acts as a protective intermediary between the sealing web and the EPS insulation. It prevents the migration of volatile components from the EPS into the sealing web, thereby maintaining the sealing web's flexibility and dimensional stability while still allowing direct installation on the insulation.
4Reliability
If a non-metallic blocking layer based on polymers is used to prevent migration, then it stops softening agent migration, but the layer itself may absorb bitumen oils affecting mechanical values
Solution Approach 1:
The invention specifies particular polyamide types (PA 6, PA 6.6, PA 12) with defined molecular structures and properties that are resistant to bitumen oil absorption. By carefully selecting and controlling the parameters of the barrier layer material, it achieves both migration prevention and maintenance of mechanical strength.
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 effectively prevents the migration of bitumen and softening agents, maintaining the flexibility and durability of the sealing web, and enhancing the aging behavior by eliminating direct contact with the surface material, thus improving the overall performance and longevity of the roofing membrane.
Implementation Method 1
a barrier layer which extends on the side facing the edifice and is based on mixtures of homopolyamides and/or copolyamides
Implementation Method 2
the barrier layer consists of a hot melt adhesive layer containing copolyamide
Data Source
AI summary
An edifice sealing web that includes a sealing web facing away from the edifice, an adjoining barrier layer which extends on the side facing the edifice and is based on mixtures of homopolyamides and/or copolyamides, and a self-adhesive layer.