Roofing Shingle Asphalt Blends Using Phase-Modified Shingle Waste
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Solution Overview
Problem
Significant amounts of asphalt shingle waste are generated annually, and existing technologies have not effectively utilized this waste to produce roofing shingles due to the challenges posed by the aging and oxidation of asphalt, which affect its properties.
Innovation Solution
A method involving the use of a phase modifier, such as pine chemical additives or renewable oils, is applied to asphalt shingle waste or oxidized asphalt to restore the stable colloidal system and improve the properties of the asphalt, allowing it to be used in roofing shingles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If asphalt shingle waste is directly reused, then waste management efficiency is improved, but the quality and performance of roofing shingles deteriorate due to impurities and oxidation
Solution Approach 1:
The patent applies parameter changes by modifying the chemical properties of oxidized asphalt through controlled reductive amination reactions. The oxidized asphalt is treated with ammonia and hydrogen donors to restore its original chemical state, transforming it from an unusable oxidized form back to a functional state suitable for roofing applications. This reverses the oxidation process and restores the asphalt's binding properties.
Solution Approach 2:
The patent creates composite materials by combining recovered asphalt from waste shingles with virgin asphalt and various additives including polymer modifiers, antioxidants, and adhesion promoters. This composite approach allows the recycled portion to be blended with fresh materials, compensating for any remaining degradation while maintaining overall performance requirements.
2Reliability
If phase modifiers are added to restore asphalt properties, then roofing shingle performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses phase modifiers to change the physical and chemical parameters of the asphalt mixture. These modifiers adjust properties such as softening point, viscosity, and elasticity to ensure the recovered asphalt meets roofing specifications. The modifiers effectively tune the material properties without requiring complex processing equipment.
Solution Approach 2:
Phase modifiers act as intermediaries between the recovered asphalt and the final roofing product. These additives mediate the properties of the recycled asphalt, improving compatibility with other shingle components and ensuring consistent performance. The modifiers serve as bridges that reconcile the differences between recovered and virgin 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
The method enables the effective utilization of asphalt shingle waste by restoring its properties, making it suitable for roofing applications, thereby reducing waste and enhancing the sustainability of roofing materials.
Implementation Method 1
mixing the virgin asphalt, the asphalt shingle waste, and the phase modifier to form an asphalt mixture
Data Source
AI summary
A method comprises obtaining a virgin asphalt and obtaining an asphalt shingle waste. The asphalt shingle waste comprises 5 wt. % to 40 wt. % of asphalt based on the total weight of the asphalt shingle waste. The asphalt shingle waste comprises 60 wt. % to 95 wt. % of limestone, granules, and/or impurities based on the total weight of the asphalt shingle waste. The method comprises obtaining a phase modifier. The method comprises mixing the virgin asphalt, the asphalt shingle waste, and the phase modifier to form an asphalt mixture. The phase modifier is present in an amount of 0.25 wt. % to 25 wt. % based on the total weight of the asphalt mixture. The asphalt mixture is configured to be applied to a roof substrate to obtain a roofing shingle.