Asphalt Emulsion Adhesive for Low-Temperature Building Membranes
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Solution Overview
Problem
Conventional adhesives are ill-suited for use in winter temperatures and fail to effectively manage water vapor diffusion and air leakage in building structures, leading to issues like mold growth, energy inefficiency, and structural damage.
Innovation Solution
A self-adhering, water-vapor permeable asphalt-emulsion adhesive system that can be applied at temperatures as low as -4°C, comprising a membrane coated with a filler-based asphalt-emulsion adhesive, which allows for water vapor passage while preventing liquid and gas penetration, and can be used in conjunction with either vapor-permeable or impermeable membranes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesives are used in winter temperatures, then they fail to maintain adhesive properties, but the patent's asphalt-emulsion adhesive maintains adhesive properties at temperatures as low as -4°C
Solution Approach 1:
The adhesive composition parameters are specifically modified to enable low-temperature application. The asphalt emulsion contains polymers (0-22 wt.%), asphalt (30-36 wt.%), water (28-40 wt.%), and fillers in controlled proportions, with no solvent required. This parameter configuration allows the adhesive to remain effective at temperatures as low as -4°C while maintaining proper adhesion properties.
Solution Approach 2:
The invention uses a composite asphalt-emulsion formulation combining multiple components: polymer modifiers, asphalt, water, and fillers. This composite material structure provides both low-temperature applicability and reliable adhesive performance, resolving the contradiction between temperature range and adhesive reliability.
2Reliability
If a continuous coating of adhesive is applied to the membrane, then adhesive coverage is maximized, but water vapor permeability may be reduced
Solution Approach 1:
The adhesive formulation incorporates fillers that create a porous structure within the adhesive layer. This porous configuration allows water vapor to diffuse through the adhesive even when applied as a continuous coating, while still providing adequate adhesive coverage and bonding strength.
Solution Approach 2:
The adhesive system provides different functional qualities at different scales: at the macro level, it forms a continuous coating for adequate coverage, while at the micro level, the filler-created pores enable water vapor permeability. This local quality differentiation resolves the contradiction between continuous coverage and vapor transmission.
3Reliability
If self-adhering membrane systems are used to prevent air leakage and moisture, then building performance improves, but conventional systems are ill-suited for winter temperatures
Solution Approach 1:
The service temperature parameters of the membrane system are extended through the specialized asphalt-emulsion adhesive formulation. The system can now be applied and function at temperatures as low as -4°C, with a service temperature range from -40°C to 80°C, making it suitable for winter construction and cold climate applications.
Solution Approach 2:
The asphalt-emulsion adhesive provides multiple functions: it adheres the membrane to the substrate, allows water vapor permeability, prevents liquid water penetration, and enables application across a wide temperature range. This multi-functionality makes the system universally applicable in various climate conditions, particularly winter temperatures.
4Object-affected harmful factors
If the adhesive contains fillers to enable water vapor passage, then vapor permeability improves, but adhesive strength may be reduced
Solution Approach 1:
Fillers are incorporated into the adhesive at controlled levels to create a porous structure that facilitates water vapor passage. The filler content and distribution are optimized to maintain adequate adhesive strength while enabling vapor permeability through the created pathways.
Solution Approach 2:
The adhesive uses a composite formulation where fillers work synergistically with polymers, asphalt, and water. This composite structure allows the fillers to create vapor pathways while the polymer-asphalt matrix maintains adhesive strength, resolving the contradiction between permeability and 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 system effectively manages water vapor and air leakage at low temperatures, preventing mold and energy inefficiencies, and maintains adhesive properties across a wide temperature range (-40°C to 80°C), eliminating the need for heating and mechanical fasteners.
Implementation Method 1
Moisture problems in walls have been attributed to water vapor diffusion and air leakage
Implementation Method 2
Air leakage is the uncontrolled movement of air through the building envelope. This movement of air into a building (infiltration) and out of a building (exfiltration) can be caused by pressure differences produced by wind, stack or chimney effect and fan pressurization
Data Source
AI summary
Embodiments of the present disclosure are directed to an adhesive asphalt emulsion. The adhesive asphalt emulsion can be prepared in liquid form and applied to a material, such as a film or fabric, to create a self-adhering membrane. In some embodiments, the adhesive can be water vapor permeable, and can be applied in a continuous layer to a membrane. The adhesive asphalt emulsion can be prepared, applied, and in service at low temperatures.