Wax-Modified Air Rectified Asphalt for Low-Temperature Roofing
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Solution Overview
Problem
Conventional Built-Up Roofing Asphalt (BURA) compositions require high application temperatures, which is undesirable as it increases energy costs and may affect heat stability and viscosity, necessitating a reduction in Equiviscous Temperature (EVT) while maintaining desired properties.
Innovation Solution
A heat stable BURA composition is achieved by using air rectified asphalt combined with a wax additive, reducing the application temperature by 50° F. to 83° F. through partial air blowing and subsequent wax addition, meeting ASTM specifications for Type 3 and Type 4 BURA.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional BURA compositions are used, then the desired heat stability and viscosity are maintained, but the application temperature must be elevated
Solution Approach 1:
The patent modifies the asphalt composition by incorporating specific additives and adjusting the chemical parameters of the base asphalt through controlled oxidation (air rectification). This changes the rheological parameters of the asphalt, allowing it to maintain desired viscosity and heat stability at lower temperatures. The modified asphalt composition achieves the same performance characteristics at reduced temperature, directly resolving the contradiction between application temperature and energy consumption.
2Loss of energy
If the application temperature is reduced, then energy consumption decreases, but the heat stability and viscosity may be compromised
Solution Approach 1:
The patent creates a composite asphalt material by combining base asphalt with specific additives including polymers, modifiers, and oxidation products. This composite structure provides enhanced thermal stability and viscosity characteristics that allow the material to maintain its properties at lower application temperatures. The composite nature of the modified asphalt ensures that heat stability is preserved even when application temperature is reduced, resolving the contradiction between energy consumption and composition stability.
3Manufacturing precision
If conventional air blowing is performed, then the asphalt meets standard specifications, but the equiviscous temperature remains high
Solution Approach 1:
The patent performs preliminary air rectification (controlled partial oxidation) of the base asphalt before final product formulation. This preliminary action modifies the molecular structure and chemical composition of the asphalt in advance, creating a base material that requires less additional processing and achieves desired specifications at lower temperatures. The pre-modified asphalt maintains compliance with ASTM specifications while achieving lower equiviscous temperature, resolving the contradiction between specification compliance and temperature reduction.
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
The air rectified, wax-modified BURA composition maintains heat stability and viscosity at lower application temperatures, reducing energy consumption and improving durability by minimizing dropback and maintaining desired penetration and softening point ranges.
Implementation Method 1
partial air blowing
Implementation Method 2
wax-modified
Data Source
AI summary
A composition and method for making a heat stable, low application temperature Built Up Roofing Asphalt (BURA) is provided. The composition comprises a wax-modified, air rectified asphalt conforming to Type 3 BURA and, in some embodiments, Type 4 BURA specifications.