Waterproofing Membrane Coating for Reflectivity and Whiteness Stability
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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 the 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 in an aqueous phase, which maintains Newtonian viscosity and enhances the dispersion of additives, reducing yellowing and maintaining reflectivity properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If acrylic polymer and titanium dioxide are dispersed in water, then the composition is easy to prepare, but the viscosity changes during application and reflectivity decreases over time
Solution Approach 1:
The patent changes the solvent parameter from water to a non-aqueous solvent (such as toluene, xylene, or other organic solvents). This parameter change maintains Newtonian viscosity characteristics during application and prevents the yellowing that occurs with aqueous dispersions, thereby preserving reflectivity stability over time while still allowing easy preparation of the composition.
Solution Approach 2:
The patent uses a composite coating system comprising acrylic polymer bound to titanium dioxide particles in a non-aqueous medium. This composite structure provides both the desired ease of application and long-term reflectivity stability, as the non-aqueous environment prevents the chemical degradation and yellowing that would otherwise occur.
2Illumination intensity
If titanium dioxide is used to provide reflectivity, then solar ray reflection is improved, but the coating yellows over time reducing reflectivity
Solution Approach 1:
The patent changes the chemical environment parameter by replacing water with non-aqueous solvents. This prevents the hydrolysis and oxidation reactions that cause titanium dioxide to yellow over time, thereby maintaining both the initial reflectivity and the long-term whiteness of the coating.
Solution Approach 2:
The patent accepts the use of organic solvents that may be more expensive than water but provides long-lasting performance. The non-aqueous solvent system prevents degradation, making the coating durable and maintaining its reflective properties throughout its service life, effectively replacing the need for frequent maintenance or replacement.
3Ease of operation
If thickening agents are added to maintain viscosity, then application consistency is improved, but the composition becomes non-Newtonian and viscosity changes during application
Solution Approach 1:
The patent changes the solvent type parameter to non-aqueous solvents, which naturally provide Newtonian flow characteristics. This eliminates the need for thickening agents and maintains stable, predictable viscosity throughout the application process, ensuring consistent application without the composition becoming non-Newtonian.
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 results in a waterproofing membrane that retains its reflectivity and whiteness over time, reducing oil migration and pollution risks, with improved dispersion and stability of the coating.
Implementation Method 1
the viscosity of the composition remains Newtonian, so it does not change during the application of the composition
Implementation Method 2
the coated waterproofing membrane has the property to reflect the solar rays due to the presence of titanium dioxide
Implementation Method 3
the coating forms as if to say a barrier against the solar rays so that the latter heat less the bituminous mass
Data Source
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AI summary
The present invention relates to a process for manufacturing a waterproofing membrane comprising: - a preparation of a composition comprising an acrylic polymer and titanium dioxide dispersed in a solvent chosen in the group consisting of a solvent other than water or water; - coating a reinforcement layer by application of said composition on one side of the reinforcement layer; - an evaporation of said solvent; - and application of a bituminous mass on another side of said reinforcement layer, characterized in that the composition comprises cristobalite. The present invention relates also to a composition for a waterproofing membrane.