Asphalt Coating Flexibility via Polyol Molecular Weight Control
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Solution Overview
Problem
Existing asphalt products, including polymer-modified bitumens, lack sufficient flexibility at lower temperatures and are challenging to process due to high costs associated with high polyol and additional ingredient requirements, making them commercially unfeasible for large-scale use.
Innovation Solution
A composition comprising an asphalt material, a polymer that is not a polyol, and a polyol with a molecular weight of 1000 to 5000, present in no more than 30% by weight, which improves processability and flexibility without the need for plasticizers or surface active agents, reducing costs and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer modified bitumen is used to improve flexibility, then elasticity and reduced brittleness are achieved, but processing difficulty and cost increase significantly
Solution Approach 1:
The patent changes the molecular weight parameter of the polyol from conventional high values to specifically 1000-5000, and controls the polyol content at 30% or less by weight. These parameter changes enable the composition to achieve flexibility without requiring excessive polyol amounts, thereby reducing processing difficulty while maintaining reliability.
Solution Approach 2:
The patent creates a composite material system combining asphalt, polymer (non-polyol type), and polyol in specific proportions. This composite approach allows the materials to work synergistically, where the polymer provides structural framework and the polyol provides flexibility, achieving both flexibility and ease of manufacture through proper material combination.
2Reliability
If high levels of polyol (40% or greater) are used to improve flexibility, then compatibility issues are overcome, but cost becomes prohibitive for commercial use
Solution Approach 1:
The patent fundamentally changes the polyol concentration parameter from conventional high levels (40% or greater) to 30% or less by weight of total composition. This parameter change, combined with selecting polyols of molecular weight 1000-5000, achieves flexibility at lower concentrations, directly reducing material cost while maintaining commercial feasibility.
Solution Approach 2:
The patent applies local quality by selecting specific molecular weight ranges (1000-5000) for the polyol component. This targeted selection optimizes the polyol's effectiveness at lower concentrations, allowing flexibility to be achieved with reduced polyol content, thereby lowering material cost without sacrificing performance.
3Reliability
If polymer and bitumen are heated and shear mixed to create PMB, then viscoelastic properties are improved, but processing time and energy consumption increase
Solution Approach 1:
The patent changes the processing parameters by using polyol with molecular weight 1000-5000 and limiting polyol content to 30% or less. These changes reduce the viscosity of the mixture, allowing for faster mixing and processing times while still achieving the desired viscoelastic properties in the final product.
Solution Approach 2:
The patent uses a moderate amount of polyol (30% or less by weight) rather than excessive amounts. This partial action approach is sufficient to achieve the required flexibility and viscoelastic properties without requiring extended processing times or excessive heating, thereby reducing energy consumption and processing time.
4Ease of manufacture
If surface active agents and plasticizers are added to improve compatibility, then mixing effectiveness increases, but composition complexity and cost increase
Solution Approach 1:
The patent extracts or removes the need for surface active agents and plasticizers from the composition. By carefully selecting polyol molecular weight (1000-5000) and controlling polyol content (30% or less), the patent achieves effective mixing and compatibility without requiring additional chemical additives, thereby reducing composition complexity and eliminating unnecessary cost increases.
Solution Approach 2:
The patent enables the polyol component to serve multiple functions on its own: it provides flexibility, ensures compatibility between asphalt and polymer, and facilitates mixing. This self-service capability of the polyol eliminates the need for separate surface active agents and plasticizers, reducing composition complexity while maintaining manufacturing effectiveness.
Data Source
AI summary
A method for forming a coating composition for coating a substrate comprising: blending an asphalt material; a polymer that is not a polyol; and a polyol wherein the polyol has a molecular weight of about 1000 to about 5000. Also, included are coated articles that comprise a substrate coated with a layer of the coating composition.