Cost-Effective Roofing Asphalt: Patent-Based Innovation
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Summary
Problems
The asphalt roofing industry faces a challenge in producing high-quality roofing shingle coating asphalts due to the scarcity and high cost of specialized 'roofer's flux' asphalts, as existing methods using non-coating grade asphalts, such as commodity paving asphalts, fail to consistently meet the required specifications for softening point, penetration, and melt viscosity.
Innovation solutions
A method involving partial air blowing of non-coating grade asphalts to achieve a target penetration and softening point, followed by the addition of a wax to further adjust the properties, allowing independent control of softening point, penetration, and melt viscosity, while maintaining excellent stain index and storage stability.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If non-coating grade asphalts (commodity paving asphalts) are used as feedstock, then cost is reduced and availability is improved, but the ability to meet coating asphalt specifications (softening point, penetration, melt viscosity) is insufficient
Why choose this principle:
The patent applies parameter changes by controlling the degree of oxidation during the air blowing process to transform non-coating grade asphalt into coating grade asphalt. By adjusting oxidation parameters (time, temperature, air flow rate), the asphalt's softening point, penetration, and viscosity are modified to meet ASTM specifications, enabling the use of cheaper commodity paving asphalts as feedstock.
Principle concept:
If non-coating grade asphalts (commodity paving asphalts) are used as feedstock, then cost is reduced and availability is improved, but the ability to meet coating asphalt specifications (softening point, penetration, melt viscosity) is insufficient
Why choose this principle:
The patent creates a composite material system by blending oxidized asphalt with unoxidized asphalt and adding fillers. This composite approach allows the final product to achieve the desired balance of properties (softening point, penetration, viscosity) that neither component alone could provide, while using inexpensive non-coating grade feedstock.
Application Domain
Data Source
AI summary:
A method involving partial air blowing of non-coating grade asphalts to achieve a target penetration and softening point, followed by the addition of a wax to further adjust the properties, allowing independent control of softening point, penetration, and melt viscosity, while maintaining excellent stain index and storage stability.
Abstract
A method of producing a roofing shingle coating asphalt from a non-coating grade asphalt feedstock includes the following steps. The non-coating grade asphalt feedstock is partially blown to lower its penetration to a first penetration that is within or close to a target penetration range of the coating asphalt, and to raise its softening point to a first softening point that is lower than a target softening point range of the coating asphalt. A wax is added to the partially blown non-coating grade asphalt to further raise its softening point to a second softening point that is within the target softening point range to produce the coating asphalt. The wax may also be added during the blowing process. Resulting roofing coating asphalt compositions may comprise a paving grade asphalt and a wax, and yet still has desirable penetration, softening point and viscosity.