Water-Swellable Adhesive Sheet for Building Waterproofing
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Solution Overview
Problem
Existing sealing elements for buildings experience a decrease in adhesive power as they swell, leading to potential detachment from the surface during the sealing process.
Innovation Solution
A pressure-sensitive adhesive sheet with a polymer composition comprising acrylates, tackifiers, and a water-swellable component, such as polyacrylamides, is used, which maintains stickiness and adhesiveness even during swelling, allowing for improved bonding and sealing without the need for additional adhesion promoters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water-swellable component is used in a sealing element, then the sealing effectiveness is improved by filling the space to be sealed, but the adhesive power decreases as the skin forms during swelling
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive polymer by incorporating carboxyl groups and using specific monomer ratios (acrylic acid, acrylamide, and other comonomers) to maintain adhesiveness during the swelling process. The polymer composition is specifically designed to resist the formation of a non-adhesive skin layer while still achieving effective sealing through controlled swelling.
2Volume of stationary object
If the sealing element swells completely to fill the space, then the sealing capability is improved, but the adhesive bond weakens due to skin formation
Solution Approach 1:
The patent creates a composite polymer material combining multiple functional components: carboxyl-rich polymers (providing swelling capability), acrylic acid (maintaining adhesiveness), acrylamide (controlling swelling rate), and various comonomers. This composite structure allows the material to simultaneously achieve complete space filling through swelling while maintaining strong adhesive bonds throughout the process.
3Reliability
If the adhesive power is maintained during swelling, then the bonding reliability is improved, but the skin formation that normally occurs during swelling is prevented
Solution Approach 1:
The patent fundamentally changes the chemical parameters of the adhesive system by incorporating polymers rich in carboxyl groups and using a specific monomer composition that prevents skin formation. The presence of acrylic acid and acrylamide in controlled ratios modifies the polymer's interaction with water during swelling, preventing the formation of a dense, non-adhesive skin layer while maintaining bonding reliability.
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 sealing element retains its adhesive properties during and after swelling, ensuring a strong and lasting bond with the surface, preventing detachment and effectively sealing the space, even in the presence of water.
Implementation Method 1
The water-swellable components swell in contact with water and thus completely fill the space to be sealed. A swelling pressure is created so that the passage of water is prevented.
Implementation Method 2
The sealing element comprises a pressure-sensitive adhesive and between 2 and 50% by weight of a water-swellable component, the adhesive sheetlike structure being a polymer comprising acrylates, tackifier and the water-swellable component. The stickiness of the pressure-sensitive adhesive means that the sheet is sticky on one or both sides and can be glued to the concrete.
Data Source
AI summary
The invention relates to the use of an adhesive planar structure with a water-swellable component as a sealing element for building waterproofing, wherein the sealing element is an adhesive planar structure comprising an adhesive and a water-swellable component, the proportion of the water-swellable component in the sealing element being between 2 wt.% and 50 wt.%, and the adhesive planar structure being a polymer comprising acrylates, tackifiers, and the water-swellable component. The invention also relates to a manufacturing process.