Waterproofing Membrane with PVAc Protective Coating
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Solution Overview
Problem
Existing waterproofing membranes for concrete require a removable release sheet, which generates environmental waste, and are often cumbersome to install, especially when needing to be unrolled with the adhesive side facing down, and lack sufficient traction for foot traffic.
Innovation Solution
A sheet-like laminate waterproofing membrane with a carrier sheet, a pressure-sensitive adhesive layer, and a protective polyvinyl acetate coating that eliminates the need for a release sheet and allows easy unrolling, while providing strong adhesion to concrete and tolerating foot traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a removable release sheet is used to protect the adhesive layer, then the adhesive is protected from premature adhesion, but environmental waste is generated and installation becomes more complex
Solution Approach 1:
The invention extracts and eliminates the release sheet component from the waterproofing membrane system. Instead of using a separate removable release sheet to protect the adhesive layer, the patent uses the carrier sheet itself as the protective element, with the adhesive layer being naturally protected by its positioning between the carrier sheet and the concrete form, thus removing the source of environmental waste.
Solution Approach 2:
The invention merges the protective function previously performed by the release sheet into the carrier sheet structure. The carrier sheet serves dual purposes: as the support structure for the membrane and as the protective element for the adhesive layer, eliminating the need for a separate release sheet component.
2Reliability
If the membrane is unrolled with adhesive side facing down, then the adhesive protects itself, but installation becomes cumbersome and time-consuming
Solution Approach 1:
The invention inverts the traditional installation approach. Instead of unrolling the membrane with the adhesive side facing down (requiring workers to walk on the release sheet), the membrane is unrolled with the carrier sheet side facing up, allowing workers to walk directly on the carrier sheet while the adhesive side remains protected against the concrete form.
Solution Approach 2:
The carrier sheet provides self-service protection for the adhesive layer during installation. The adhesive layer automatically protects itself by being positioned between the carrier sheet and the concrete form, eliminating the need for a separate release sheet and simplifying the installation process.
3Reliability
If a slippery protective coating is applied to the adhesive layer, then the adhesive is protected, but foot traffic becomes difficult
Solution Approach 1:
The invention segments the protective function into two separate components: the carrier sheet provides structural support and walkability, while the adhesive layer provides bonding protection. This segmentation allows the protective coating to be applied only where needed (on the adhesive side against the concrete form) without compromising foot traffic capability on the carrier sheet side.
Solution Approach 2:
The invention applies protective properties locally rather than uniformly across the entire membrane. The adhesive layer receives protective coating only on the side contacting the concrete form, while the carrier sheet side maintains its original walkable surface properties, allowing workers to walk on it 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 effectively bonds to concrete, reduces waste by eliminating the need for a release sheet, and facilitates easier installation by being right-side up when unrolled, with the protective coating ensuring durability and traction.
Implementation Method 1
a pressure sensitive adhesive layer on one surface of the carrier sheet
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 polyvinyl acetate (PVAc). The protective coating layer protects the membrane against weather exposure, tolerates foot traffic and strongly adheres to concrete cast against it.