Asphalt Upgrading Without Oxidation via Wax Blending
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Solution Overview
Problem
The existing process of oxidizing asphalt to produce coating grade for roofing shingles poses environmental and health hazards due to the creation of harmful vapors and requires expensive capturing and scrubbing devices, while also increasing the cost of production.
Innovation Solution
A method to modify non-coating grade asphalt into coating grade without oxidation by heating it and mixing it with a fine crystalline, long chain, aliphatic polymethylene hydrocarbon wax, such as Sasol wax, in a specific concentration to enhance its properties, eliminating the need for oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxidation process is used to produce coating grade asphalt, then the necessary properties for roofing shingles are achieved, but health hazards and environmental problems increase due to harmful vapors
Solution Approach 1:
The patent removes the oxidation step from the asphalt processing sequence, extracting the harmful vapor-generating reaction while retaining the desired outcome through alternative means (blending non-coating grade asphalts with specific additives to achieve coating-grade properties without oxidation)
Solution Approach 2:
The patent converts the previously harmful oxidation process into a beneficial blending process that achieves the same functional outcome (coating-grade properties) without the harmful byproducts, effectively turning a harmful chemical reaction into a safe physical mixing process
2Reliability
If oxidation process is used to produce coating grade asphalt, then the necessary properties for roofing shingles are achieved, but production cost increases due to expensive capturing and scrubbing devices
Solution Approach 1:
The patent eliminates the need for expensive vapor capture and scrubbing equipment by removing the oxidation step entirely, extracting only the essential function (achieving coating-grade properties) while discarding the costly and complex harmful vapor management infrastructure
Solution Approach 2:
The patent replaces expensive, complex, and durable oxidation equipment with a simpler, cheaper blending process using readily available non-coating grade asphalts and additives, achieving the same result with less expensive, more flexible materials
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 reduces health hazards and environmental problems, lowers production costs, and achieves the necessary properties for roofing shingles without the oxidation process, ensuring durability and flexibility while meeting industry standards.
Implementation Method 1
The Sasol wax is a fine crystalline, long chain, aliphatic polymethylene hydrocarbon produced from coal gasification using the Fischer-Tropsch (FT) process
Implementation Method 2
heating the non-coating grade asphalt to a melting temperature in a mixing chamber to produce a melted non-coating grade asphalt
Data Source
AI summary
Disclosed are asphalts that are suitable for making shingles and other roofing material, i.e., coating asphalts, from harder paving asphalts, without oxidation of the paving asphalts. This is achieved by using various additives, including polyethylene waxes, low density and high density polyethylene materials, hard paraffin polyethylene, Sasol waxes, that are made using the Fischer-Tropsch process, and thermoplastic polyolefins that reduce brittleness at cold temperatures.