Waterproofing Membrane With Cement-Based Protective Coating
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Solution Overview
Problem
Existing waterproofing membranes for concrete require a removable release sheet, which creates environmental waste and labor costs, and often fail to provide strong adhesion after UV exposure or tolerate foot traffic effectively.
Innovation Solution
A waterproofing membrane with a carrier sheet, pressure-sensitive adhesive layer, and a protective coating layer made from an aqueous polymer emulsion, cement, and white pigment, which eliminates the need for a release sheet and ensures strong adhesion to concrete, UV resistance, and foot traffic tolerance.
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 the membrane can be stored and handled without self-adhesion, but the release sheet creates environmental waste and increases labor costs for removal and disposal
Solution Approach 1:
The invention extracts and eliminates the release sheet component entirely by modifying the carrier sheet surface properties. The carrier sheet is treated to provide inherent release properties without requiring a separate removable layer, thus eliminating the waste associated with release sheets while maintaining the ability to prevent self-adhesion during storage and handling.
Solution Approach 2:
The release function is merged into the carrier sheet itself through surface treatment. Instead of having a separate release sheet layer that must be removed, the carrier sheet is modified to provide both structural support and release properties simultaneously, combining multiple functions into a single integrated component.
2Stability of the object's composition
If a protective coating is applied to the adhesive layer to protect it during storage and application, then the adhesive is protected from premature bonding, but the coating may interfere with adhesion to concrete if not properly designed
Solution Approach 1:
The protective coating is designed with specific parameter characteristics: it has low tackiness to prevent premature bonding during storage, yet maintains compatibility with the adhesive layer to ensure proper bonding to concrete later. The coating's chemical composition and physical properties are carefully controlled to balance protection during storage with effectiveness during application.
Solution Approach 2:
The protective coating acts as an intermediary layer that temporarily protects the adhesive without permanently interfering with its bonding capability. It serves as a transient barrier that can be overcome or removed during the concrete bonding process, allowing the adhesive to fulfill its primary function of bonding to concrete.
3Reliability
If the membrane is designed to adhere strongly to concrete, then waterproofing effectiveness is improved, but the membrane may adhere to itself during storage and handling
Solution Approach 1:
Different regions of the membrane are given different properties: the adhesive layer is designed for strong concrete adhesion, while the carrier sheet surface is treated to provide release properties. This local differentiation allows the membrane to have strong bonding capability where needed while preventing self-adhesion in other areas during storage and handling.
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 excellent adhesion to concrete, withstands UV exposure, tolerates foot traffic, and provides good immersion resistance without the need for a release sheet, reducing environmental impact and labor costs.
Implementation Method 1
a protective coating layer made from an aqueous polymer emulsion, cement, and white pigment
Implementation Method 2
The protective coating layer is produced from an aqueous coating comprising a polymer emulsion, cement, and a white pigment... ensures strong adhesion to concrete, UV resistance
Implementation Method 3
a pressure-sensitive adhesive layer on one surface of the carrier sheet... ensures strong adhesion to concrete
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 is highly reflective (optionally textured) and operative to bond to concrete cast against it. Preferably, the protective coating layer comprises cement, polymer, and white pigment, and may optionally or additionally include a filler, a UV absorber and an antioxidant. The protective coating layer protects the membrane against weather exposure, tolerates foot traffic and strongly adheres to concrete cast against it. Also disclosed is a waterproofing membrane comprising a carrier sheet, a pressure sensitive adhesive layer, a protective coating layer (as described above), and a highly releasable bonding layer.