Building Envelope Adhesive Tape with Low Diffusion Resistance
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Solution Overview
Problem
Existing adhesive tapes used in building envelopes for outdoor applications, such as house construction, face challenges in balancing water vapor permeability, mechanical stability, and flexibility, leading to issues like condensation, structural damage, and leaks due to their high diffusion resistance and inherent material properties.
Innovation Solution
An adhesive tape with a carrier material composed of ethylene-vinyl acetate (EVA) and thermoplastic-elastomeric ether-ester block copolymer (TPE-E), which is elastically stretchable with a specific elongation difference and provides adjustable water vapor permeability and mechanical properties, ensuring a balance between diffusion openness and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive tapes with high diffusion resistance (sd values of 20-50 m) are used for bonding films, then joint sealing and windproofing are improved, but water vapor diffusion resistance increases causing condensation and moisture accumulation
Solution Approach 1:
The patent changes the diffusion resistance parameter from the prior art range of 20-50 m to a new range of 1-10 m, optimizing it to match the vapor permeability of the building films while maintaining effective joint sealing and preventing condensation
Solution Approach 2:
The adhesive tape uses a composite structure combining a non-woven carrier material with a porous adhesive layer containing hydrophobic particles, creating a material that is both vapor-permeable and water-resistant, resolving the contradiction between sealing and moisture management
2Adaptability or versatility
If soft and flexible carrier materials are used for adhesive tapes to conform to uneven surfaces, then adaptability and sealing are improved, but mechanical stability and processability deteriorate
Solution Approach 1:
The patent employs a non-woven carrier material that provides flexibility and suppleness to conform to uneven surfaces and accommodate film tensions, while the bonded joint structure provides the necessary mechanical stability
Solution Approach 2:
The adhesive layer acts as an intermediary between the flexible carrier material and the building films, providing both flexibility for conformation and bonding strength for mechanical stability
3Object-affected harmful factors
If mechanically stretched polymer films are used as carrier material to increase diffusivity, then water vapor permeability is improved, but mechanical strength and waterproofness deteriorate
Solution Approach 1:
The patent uses a porous non-woven carrier material with controlled pore structure that provides high water vapor permeability while maintaining mechanical integrity and waterproofness through the interconnected pore architecture
Solution Approach 2:
The combination of non-woven carrier material with porous adhesive layer creates a composite that achieves both high diffusivity (sd value 1-10 m) and sufficient mechanical strength for durable bonding
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 adhesive tape achieves a diffusion resistance of ≤12 m, maintaining mechanical stability and flexibility, preventing moisture accumulation and ensuring a reliable, long-lasting seal while allowing for easy installation on uneven surfaces.
Implementation Method 1
an adhesive tape for bonding films in the area of a building envelope, with a carrier material and a pressure-sensitive adhesive coating arranged thereon
Implementation Method 2
The carrier material of the adhesive tape is elastically stretchable with a difference value between the percentage total elongation under load Eg and the percentage permanent elongation after load εb in the range from 6 to 80
Implementation Method 3
The adhesive tape according to the invention is open to diffusion with a diffusion resistance with an sd value of ≤12 m
Data Source
Figure 1~3
AI summary
Adhesive tape for sticking sheet materials to the covering of a building, comprising a base material (1) with a contact adhesive coating (2), in which the tape is open to diffusion with a diffusion resistance having an s d value of not more than 12 m and the base material (1) is elastically ductile with a difference of 6-80 between the total percentage elongation under load (epsilon g) and the residual percentage elongation after loading (epsilon b).