Plasterable Self-Adhesive Film for Window Frame Sealing
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Solution Overview
Problem
Existing sealing films for window and roof connections in construction, while providing airtight and windproof solutions, are difficult to plaster over and have limited adhesive tensile strength, necessitating mechanical fastening and additional supports, and fail to effectively manage water vapor diffusion according to building physics requirements.
Innovation Solution
A multi-layer film web with a thermoplastic middle layer and outer layers that can be plastered over, featuring a self-adhesive layer composed of styrene-isoprene-styrene block copolymer, styrene-butadiene rubber, and tackifying resin, offering enhanced adhesive properties and flexibility for installation and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing sealing films (ethylene-propylene-diene rubber, butyl, thermoplastic polyolefins, etc.) are used to achieve airtight and windproof connections, then sealing effectiveness is improved, but the films cannot be plastered over with commercially available mortars and require mechanical fastening or plaster supports
Solution Approach 1:
The invention uses a composite material structure consisting of a fleece layer (for plasterability) combined with a self-adhesive layer containing styrene-isoprene-styrene block copolymer, styrene-butadiene rubber, and tackifying resin (for sealing effectiveness). This composite structure allows the film to be both plasterable with commercial mortars and effectively airtight/windproof simultaneously, eliminating the need for mechanical fastening or additional plaster supports
Solution Approach 2:
The invention changes the chemical composition parameters of the self-adhesive layer by specifically formulating it with styrene-isoprene-styrene block copolymer, styrene-butadiene rubber, and tackifying resin in defined proportions. This parameter optimization provides enhanced adhesive tensile strength while maintaining compatibility with plaster materials, enabling both effective sealing and easy plastering
2Ease of manufacture
If self-adhesive butyl tapes with fleece are used to enable plastering, then plasterability is improved, but the thickness becomes equal to or greater than 1 mm and mechanical fastening or plaster supports are still required
Solution Approach 1:
The invention optimizes the thickness parameter of the fleece layer to be between 0.3-2.0 mm and the self-adhesive layer to be between 0.1-1.0 mm, creating a thin composite structure that does not require mechanical fastening. This parameter optimization maintains both plasterability and adequate adhesive strength without the need for additional installation complexity
Solution Approach 2:
The composite structure combines a thin fleece layer with an optimized self-adhesive layer, creating a material that is both plasterable and sufficiently strong without requiring mechanical fastening or plaster supports, thereby simplifying the overall installation process
3Strength
If the adhesive layer is made thicker to improve adhesive tensile strength, then bonding strength is improved, but the film becomes more difficult to handle and install
Solution Approach 1:
The invention changes the composition parameters of the adhesive layer by incorporating styrene-isoprene-styrene block copolymer, styrene-butadiene rubber, and tackifying resin in specific proportions, achieving high adhesive tensile strength with a thin layer thickness of 0.1-1.0 mm. This maintains good handling properties while providing sufficient bonding strength
Solution Approach 2:
The composite self-adhesive layer combines multiple polymer components and tackifying resins to achieve high adhesive strength in a thin configuration, making the film easy to handle and install while maintaining adequate bonding performance
4Object-affected harmful factors
If diffusion-blocking films are used on the warm side to prevent water vapor penetration, then water vapor protection is improved, but moisture management according to building physics requirements becomes more difficult
Solution Approach 1:
The invention applies different properties to different locations: the self-adhesive layer provides diffusion-blocking properties where needed for sealing, while the fleece layer provides diffusion-open properties for moisture management. This local differentiation allows the film to meet building physics requirements by enabling moisture release in appropriate areas while maintaining airtightness at connection points
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 film web achieves airtight and windtight connections with improved adhesive strength, allowing for easy correction and plastering over, while effectively managing water vapor diffusion, meeting DIN 4108 and EnEV regulations by ensuring moisture balance and preventing water vapor penetration.
Implementation Method 1
a self-adhesive layer which is applied to a surface of one of the outer layers not lying on the middle layer
Implementation Method 2
at least one styrene-isoprene-styrene (SIS) block copolymer; b) at least one styrene-butadiene rubber (SBR)
Implementation Method 3
at least one tackifying resin
Implementation Method 4
which is preferably diffusion-open to diffusion-blocking
Data Source
AI summary
The invention relates to a multilayer film sheet for the construction sector, preferably vapor-permeable to vapor-barrier, comprising a, in particular preferably, thermoplastic plastic as a middle layer and plasterable outer layers selected from nonwoven fabric, woven fabric, technical knit, knitted fabric, glass fibers, reinforced paper, films or a combination thereof, and a self-adhesive layer applied to a surface of one of the outer layers not adjacent to the middle layer, characterized in that the self-adhesive layer is a hot-melt adhesive comprising: a) at least one styrene-isoprene-styrene (SIS) block copolymer; b) at least one styrene-butadiene rubber (SBR); and c) at least one tackifying resin. A window frame comprising the multilayer film sheet of the present invention and specific uses of the multilayer film sheet.