Waterproofing Membrane With Corona-Treated Carrier Sheet
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Solution Overview
Problem
Existing waterproofing membranes for concrete surfaces require a removable release sheet, leading to environmental waste and labor inefficiencies, and often fail to provide strong adhesion after UV exposure, tolerate foot traffic, or resist immersion without delamination.
Innovation Solution
A waterproofing membrane with a carrier sheet, pressure-sensitive adhesive layer, and a protective coating layer comprising an aqueous acrylic emulsion, filler, and white pigment, which is highly reflective and includes a highly releasable bonding layer, allowing it to bond strongly to concrete and resist UV exposure, foot traffic, and immersion without the need for a release sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a removable release sheet is used to prevent adhesive adhesion to the carrier sheet, then blocking resistance is improved, but device complexity and labor efficiency worsen due to additional disposal steps and environmental waste
Solution Approach 1:
The patent extracts and removes the release sheet component entirely from the membrane system. Instead of using a separate release sheet layer, the invention modifies the carrier sheet surface properties directly through corona treatment or plasma treatment to provide the necessary blocking resistance without requiring any removable protective layer, thereby eliminating disposal steps and environmental waste
Solution Approach 2:
The carrier sheet is given multiple functions: it provides structural support, prevents adhesive adhesion to itself (blocking resistance) through surface treatment, and enables strong adhesion to concrete through the treated surface. This multi-functionality eliminates the need for a separate release sheet component
2Strength
If the adhesive layer is exposed to UV radiation before concrete casting, then adhesion to concrete is improved, but reliability worsens due to UV degradation of the adhesive
Solution Approach 1:
The patent applies preliminary protective action by treating the carrier sheet surface with corona or plasma treatment before concrete casting. This surface treatment creates a protective layer that prevents UV degradation of the adhesive while maintaining or enhancing its adhesion properties, allowing the membrane to withstand UV exposure without compromising bond strength
Solution Approach 2:
The invention changes the surface energy and chemical properties of the carrier sheet through corona or plasma treatment. This parameter change creates a surface that is resistant to UV degradation while maintaining high adhesion capability, allowing the membrane to be exposed to UV radiation before concrete placement without losing bond strength
3Reliability
If a protective coating is applied to the adhesive layer to protect against UV exposure, then reliability is improved, but adhesion strength to concrete worsens due to interference with concrete bonding
Solution Approach 1:
Instead of applying a protective coating over the adhesive layer that would interfere with concrete bonding, the invention inverts the approach by treating the carrier sheet surface itself with corona or plasma treatment. This creates the protective function at the carrier sheet level rather than at the adhesive level, allowing UV resistance without compromising adhesion to concrete
4Strength
If the membrane is made highly adherent to concrete, then bond strength is improved, but ease of operation worsens due to difficulty in unrolling and installation
Solution Approach 1:
The patent applies local quality by creating different surface properties in different locations of the membrane system. The carrier sheet surface is treated with corona or plasma treatment to provide high adhesion to concrete, while the adhesive-concrete interface maintains optimal bonding properties. This localized treatment allows high bond strength without compromising ease of handling during installation
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 membrane achieves strong adhesion to concrete after UV exposure, tolerates foot traffic, and resists immersion, eliminating the need for a release sheet and reducing environmental waste, while maintaining flexibility to prevent cracking.
Implementation Method 1
The adhesive portion of the membrane will adhere to the freshly poured concrete, thus providing a fully adhered waterproofing membrane on the cured concrete surface
Implementation Method 2
The protective coating layer is highly reflective and operative to bond to concrete cast against it
Data Source
AI summary
Disclosed is a waterproofing membrane that comprises a carrier sheet, a pressure sensitive adhesive layer on one surface of the carrier sheet, and a protective coating layer on the adhesive layer. The protective coating layer comprises a highly reflective protective coating layer operative to bond to concrete cast against it, particularly one that is produced from an aqueous coating comprising an acrylic emulsion, a filler, and a white pigment. The pigment volume concentration of the filler plus white pigment is greater than or equal to 40% by volume. The protective coating layer protects the membrane against weather exposure, tolerates foot traffic and strongly adheres to concrete cast against it. The protective coating comprises an acrylic polymer with a unique multi-domain morphology (i.e., at least two distinct polymer domains).