Polyurethane-Asphalt Dispersion for One-Component Coatings
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Solution Overview
Problem
Prior asphalt emulsions often require reactive two-component compositions with isocyanate components for satisfactory performance, limiting their application and efficiency.
Innovation Solution
A polyurethane-asphalt dispersion is developed, where the polyurethane dispersion is based on polytetramethyl ethylene glycol (PTMEG) and/or polycaprolactone, with the aqueous asphalt mixture constituting a majority volume percent, enhancing tensile and peel strength without the need for reactive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reactive two-component compositions with isocyanate components are used, then satisfactory performance is achieved, but application complexity and efficiency are limited
Solution Approach 1:
The patent combines the polyurethane component and asphalt emulsion into a single one-component composition. The polyurethane dispersion is incorporated directly into the asphalt emulsion formulation, eliminating the need for separate isocyanate component application. This merging of components resolves the technical contradiction by maintaining reliable performance through the integrated polyurethane-asphalt system while significantly reducing application complexity from two-component to one-component system.
Solution Approach 2:
The invention segments the polyurethane into a pre-formed dispersion that can be directly incorporated into the asphalt emulsion. Instead of using reactive isocyanate that requires in-situ reaction, the polyurethane is pre-dispersed in aqueous form, allowing direct mixing with asphalt emulsion. This segmentation enables the system to achieve satisfactory performance without requiring complex two-component application procedures.
2Strength
If polyurethane dispersion based on PTMEG and/or polycaprolactone is used, then tensile strength and peel strength are improved, but formulation complexity increases
Solution Approach 1:
The patent specifies particular polyurethane parameters - based on PTMEG (polytetramethyl ethylene glycol) and/or polycaprolactone - to achieve improved tensile and peel strength. These parameter specifications target the molecular structure and composition of the polyurethane dispersion. The formulation complexity is managed by focusing on these specific polymeric parameters rather than requiring complex multi-component formulations, thus resolving the contradiction between achieving high strength properties and maintaining formulation simplicity.
Solution Approach 2:
The invention creates a composite system by incorporating polyurethane dispersion into asphalt emulsion. The polyurethane component (based on PTMEG and/or polycaprolactone) forms a composite structure with the asphalt matrix, synergistically improving tensile and peel strength. This composite approach achieves enhanced mechanical properties through the combination of materials rather than through complex formulation procedures, resolving the technical contradiction.
3Reliability
If aqueous asphalt mixture constitutes majority volume percent, then adhesion and flexibility are enhanced, but polymer concentration is reduced
Solution Approach 1:
The patent employs local quality by incorporating polyurethane dispersion at specific locations within the asphalt emulsion matrix. The polyurethane component is distributed throughout the aqueous asphalt mixture, providing localized adhesion enhancement and flexibility improvement at the molecular level. This allows the majority of the formulation to remain as aqueous asphalt mixture (maintaining adhesion and flexibility) while still achieving effective polymer reinforcement through strategically distributed polyurethane segments.
Data Source
AI summary
The invention relates to liquid compositions that include an aqueous asphalt mixture and polyurethane dispersion. The polyurethane dispersion includes a polyurethane that is based on an aliphatic polyol backbone based on polytetramethyl ethlene glycol and/or polycaprolactone. The aqueous asphalt mixture in the liquid composition generally constitutes a majority volume percent of the liquid composition. The polyurethane dispersion generally constitutes at least about 0.1 volume percent of said liquid composition.