Synthetic Wax from Plastic Depolymerization for Asphalt
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Solution Overview
Problem
Existing methods for producing wax additives for asphalt processing are inefficient and often result in the release of greenhouse gases, while also failing to effectively improve the physical properties and processability of roofing asphalt.
Innovation Solution
A method is developed to create synthetic waxes through the depolymerization of recycled plastic materials, which are then added to asphalt to modify its properties, improving processing and physical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to produce wax additives for asphalt processing, then the process is established, but the efficiency is low and greenhouse gases are released
Solution Approach 1:
The patent changes the chemical parameters of the wax production process by using depolymerization of recycled plastics instead of conventional petroleum-based wax production. This parameter change in the chemical process leads to improved efficiency and eliminates harmful greenhouse gas emissions while producing high-quality wax additives.
Solution Approach 2:
The patent converts harmful recycled plastic waste into useful wax additives through depolymerization. The waste plastic material, which would otherwise be harmful to the environment, is transformed into a beneficial product that improves asphalt processing, thereby converting a harmful factor into a benefit.
2Reliability
If wax is added to improve the physical properties of roofing asphalt, then processing and physical characteristics are improved, but blending of asphalt and polymer additive is compromised
Solution Approach 1:
The patent changes the chemical and physical parameters of the wax to ensure compatibility with both asphalt and polymer additives. By controlling the molecular structure and composition of the synthetic wax, the patent achieves improved physical properties while maintaining stable blending with other asphalt components.
Solution Approach 2:
The patent creates a composite wax material that combines properties suitable for both asphalt modification and polymer additive compatibility. The synthetic wax is designed as a composite substance that integrates multiple functional requirements, allowing simultaneous improvement of physical properties and maintenance of blending stability.
3Productivity
If existing conversion processes are used to convert polymeric solid wastes, then conversion is achieved, but the processes are inefficient and release greenhouse gases
Solution Approach 1:
The patent changes the conversion process parameters by implementing depolymerization instead of conventional combustion or incineration. This parameter change in the chemical transformation process dramatically improves conversion efficiency and eliminates greenhouse gas release while producing valuable wax additives from polymeric waste.
Solution Approach 2:
The patent converts harmful polymeric waste materials into beneficial wax additives through depolymerization. The waste plastics, which contribute to environmental pollution, are transformed into useful products that improve asphalt processing, thereby converting a harmful factor into a benefit while improving overall conversion efficiency.
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 use of synthetic waxes derived from recycled plastics enhances the processing and physical properties of polymer-modified asphalt, including reduced blend time, increased recycled asphalt loading, improved compaction, and enhanced thermal stability and elastomeric properties.
Implementation Method 1
placing the molten polymeric material through a chemical depolymerization process in a reactor to produce a depolymerized wax material
Implementation Method 2
heating the solid polymeric material in an extruder to produce a molten polymeric material
Data Source
AI summary
An improved method forms and employs a wax to modify asphalt. The method includes: (a) selecting a solid polymeric material, (b) heating the solid polymeric material in an extruder to produce a molten polymeric material, (c) filtering the molten polymeric material, (d) placing the molten polymeric material through a chemical depolymerization process in a reactor to produce a depolymerized polymeric material, and (e) adding the depolymerized material to a pre-wax mixture to produce a polymer-modified asphalt. The addition of wax reduced the mixing time necessary to achieve improved polymer dispersion compared to the control formulation modified bitumen and reduced the viscosity of the neat bitumen. Pre-polymer addition of wax is detrimental to most properties of the resulting modified asphalt. Post-polymer addition improved viscosity reduction, higher softening point and improved dimensional stability.