Waterproofing Membrane Coating for Stable Reflectivity
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Solution Overview
Problem
The existing waterproofing membranes experience a decrease in reflectivity over time, leading to increased heat absorption and oil migration, which reduces their long-term whiteness and can cause pollution when oil mixes with rainwater.
Innovation Solution
The process involves dispersing acrylic polymer and titanium dioxide in a solvent other than water or mixing them with cristobalite, which maintains Newtonian viscosity and enhances reflectivity stability, reducing yellowing and sedimentation, and allowing for better dispersion and anchoring to the reinforcement layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the coating is applied using an aqueous phase dispersion, then the initial reflectivity is achieved, but the viscosity changes during application and reflectivity decreases over time due to yellowing
Solution Approach 1:
The patent changes the solvent parameter from water to an organic solvent (such as toluene, xylene, or ethyl acetate), which fundamentally alters the viscosity characteristics of the composition. This parameter change transforms the non-Newtonian, time-dependent viscosity of aqueous dispersions into a stable, Newtonian viscosity that remains constant during application, thereby resolving the viscosity stability issue while maintaining high reflectivity.
2Ease of manufacture
If the coating is applied using an aqueous phase dispersion, then the composition can be easily prepared, but the reflectivity decreases over time due to yellowing and oil migration
Solution Approach 1:
The patent changes the solvent parameter from water to an organic solvent, which prevents the yellowing and oil migration issues that occur with aqueous dispersions over time. This parameter change extends the duration of reflectivity from months to years, while the ease of manufacture is maintained through simple mixing procedures similar to aqueous systems.
3Stability of the object's composition
If additives such as thickening agents are used to maintain viscosity, then the composition stability is improved, but the complexity of the composition increases and reflectivity still decreases over time
Solution Approach 1:
The patent changes the solvent parameter from water to an organic solvent, which inherently provides Newtonian viscosity stability without requiring any additives or thickening agents. This eliminates the need for additional composition components, reducing composition complexity while maintaining viscosity stability, and simultaneously prevents reflectivity degradation over time.
4Illumination intensity
If titanium dioxide is used to provide reflectivity, then the initial white color and reflectivity are achieved, but the color changes to yellow over time reducing reflectivity
Solution Approach 1:
The patent changes the solvent parameter from water to an organic solvent, which creates a chemically stable environment that prevents the yellowing of titanium dioxide over time. This parameter change maintains both the white color and high reflectivity of the coating for extended periods, resolving the color stability issue while preserving the initial reflectivity performance.
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
This approach maintains the reflectivity of the waterproofing membrane over a longer period, reducing yellowing and oil migration, and ensuring a more stable and homogeneous coating that prevents pollution.
Implementation Method 1
the coated waterproofing membrane, obtained by the known process, has the property to reflect the solar rays due to the presence of titanium dioxide
Implementation Method 2
the coating forms as if to say a barrier against the solar rays so that the latter heat less the bituminous mass
Implementation Method 3
With the solvent other than water, the viscosity of the composition remains Newtonian, so it does not change during the application of the composition
Implementation Method 4
the acrylic polymer and the titanium dioxide anchor better to the reinforcement layer
Implementation Method 5
the oil contained in the bituminous mass may migrate more easily to the upper side of the waterproofing membrane because the membrane heats more up due to the reflectivity decrease
Data Source
AI summary
The present invention relates to a process for manufacturing a waterproofing membrane comprising:a preparation of a composition dispersed in a solvent;coating a reinforcement layer by application of said composition on one side of the reinforcement layer;an evaporation of said solvent;having the coated reinforcement layer dried; andan application of a bituminous mass on another side of said reinforcement layer,characterized in that, during the preparation of the composition, the composition is dispersed in a solvent chosen in the group consisting of a solvent other than water or water.The present invention relates also to a composition for a waterproofing membrane.