Hybrid Laminate Adhesion at Low Temperatures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional self-adhesive laminates fail to provide a reliable seal at low temperatures and on non-ideal surfaces, such as oriented strand board (OSB), due to the limitations of bitumen layers and butyl rubber adhesives, leading to inefficiencies and potential infestation issues in construction environments.
Innovation Solution
A hybrid laminate with a hot melt adhesive layer for low-temperature adhesion, a thicker rubberized asphalt layer for self-sealing, and a top film layer for durability and protection, combining materials like thermoplastic elastomers and pressure-sensitive adhesives to ensure strong adhesion and self-sealing capabilities at extreme temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If bitumen layers are used for adhesion, then adhesive properties are acceptable at temperatures greater than 60 degrees Fahrenheit, but adhesion is insufficient at lower temperatures such as 20 degrees Fahrenheit
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive layer by incorporating specific polymers (SBS, SIS, SEBS block copolymers) and modifying the adhesive's glass transition temperature and melting point to maintain adhesion at low temperatures. This parameter modification allows the adhesive to remain effective from 20°F to 120°F, resolving the temperature-dependent adhesion limitation of conventional bitumen.
Solution Approach 2:
The patent creates a composite adhesive system combining bitumen with thermoplastic elastomers (SBS, SIS, SEBS) and other polymers (EVA, acrylics). This composite material integrates the low-temperature adhesion properties of thermoplastic elastomers with the sealing capabilities of bitumen, achieving reliable adhesion across an extended temperature range while maintaining self-sealing properties.
2Reliability
If conventional laminates are used to seal flanges, then sealing is effective under optimal conditions, but sealing fails on non-ideal surfaces such as OSB with waxy coatings
Solution Approach 1:
The patent modifies the adhesive layer's chemical parameters by incorporating tackifiers, coupling agents, and surfactants that enhance adhesion to low-energy surfaces like OSB. These compositional changes enable the adhesive to penetrate and bond to waxy coatings and textured surfaces, expanding surface compatibility while maintaining sealing reliability.
Solution Approach 2:
The patent introduces intermediary substances in the adhesive layer, such as coupling agents and surfactants, that mediate between the adhesive and difficult-to-bond surfaces like OSB. These intermediaries reduce surface tension and improve wetting, allowing the adhesive to effectively bond to non-ideal surfaces while maintaining overall seal integrity.
3Temperature
If butyl rubber adhesives are used, then adhesive characteristics are retained at lower temperatures, but cost becomes prohibitively expensive
Solution Approach 1:
The patent changes the adhesive composition by using more cost-effective thermoplastic elastomers (SBS, SIS, SEBS) and polymer blends that can achieve low-temperature adhesion performance similar to butyl rubber. By optimizing the polymer ratios and adding performance-enhancing additives, the patent achieves comparable low-temperature adhesion at a lower material cost.
Solution Approach 2:
The patent employs a cost-effective adhesive formulation using readily available polymers and materials that can be applied in thin layers (2-5 mils). This approach uses economical materials strategically to achieve the required performance without the high cost of pure butyl rubber, making the solution economically viable for large-scale construction applications.
4Reliability
If adhesive layers are made thicker to provide nail-sealing capabilities, then self-sealing capability improves, but cost becomes prohibitively expensive
Solution Approach 1:
The patent modifies the adhesive layer's physical parameters by incorporating elastomeric components and adjusting the polymer composition to enhance self-sealing properties. These parameter changes allow the adhesive to effectively seal around fasteners even at reduced thicknesses (2-5 mils), achieving nail-sealing capability without requiring prohibitively thick applications.
Solution Approach 2:
The patent creates local quality variations in the adhesive layer by incorporating self-sealing agents and elastomeric components concentrated in specific regions or at controlled thicknesses. This localized enhancement of self-sealing properties allows the adhesive to provide effective nail-sealing capability where needed while maintaining overall cost-effectiveness through optimized material distribution.
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 hybrid laminate maintains adhesion and self-sealing properties at temperatures as low as 20 degrees Fahrenheit, effectively sealing gaps around windows, doors, and roofing, while being cost-effective and suitable for various construction materials, thus preventing air, water, and pest infiltration.
Implementation Method 1
a bottom layer of preferably hot melt adhesive formulated to have sufficient adhesion to construction materials such as wood, metal, vinyl and wood composites such as OSB, down to a lower temperature, such as 20 degrees F
Implementation Method 2
The rubberized asphalt provides self-sealing capabilities and additional durability. The third layer is a top surface of film, which can be a thin, contiguous polymer, fabric or particulate.
Data Source
AI summary
A laminate tape that has a bottom layer of aggressive adhesive formulated to have sufficient adhesion to construction materials to as low as 20 degrees F. The adhesive is applied in a layer of about 2 to 5 mils. A second layer that is about 10 to 60 mils thick is made of rubberized asphalt, which provides self-sealing capabilities. In one embodiment, the first layer has strips of adhesive and sections of rubberized asphalt. The third layer is a film, which can be a thin, contiguous polymer, fabric or particulate. The laminate can be used where a strong adhesive is needed that will adhere to construction materials at or near 20 degrees Fahrenheit, while still retaining self-sealing characteristics.