Asphalt Modification Using Polymer-Derived Waxes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional methods for modifying asphalt properties, such as oxidation, are time-consuming and costly, and the use of recycled ground tire rubber in asphalt formulations can lead to processing difficulties and stability issues, while existing wax additives do not fully address the need for improved high-temperature resistance and hardness without increasing emissions.
Innovation Solution
Incorporating waxes derived from the depolymerization of polymeric materials, such as polyethylene and polypropylene, into asphalt formulations to enhance softening point, hardness, and performance grade, potentially reducing or eliminating the need for oxidation and improving the stability and processing of asphalt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If oxidation process is used to modify softening point and hardness of asphalt, then the softening point and hardness are improved, but the process is time-consuming and costly
Solution Approach 1:
The patent changes the chemical composition parameters of asphalt by incorporating polymers (SBS, GTR, PET) and waxes, which fundamentally alter the material properties to achieve higher softening points without requiring prolonged oxidation treatment. This compositional modification replaces the time-intensive oxidation approach with a more efficient additive-based solution.
Solution Approach 2:
The invention creates composite asphalt formulations by combining base asphalt with multiple additives including polymers and waxes. These composite materials achieve the desired softening point and hardness improvements through synergistic effects of the components, eliminating the need for extended oxidation processes while maintaining or enhancing performance.
2Temperature
If oxidation process is used to modify softening point and hardness of asphalt, then the softening point and hardness are improved, but the cost increases
Solution Approach 1:
The patent modifies the chemical composition parameters of asphalt through the addition of polymers and waxes, achieving the required softening point and hardness improvements more cost-effectively than traditional oxidation methods. This approach reduces manufacturing costs by eliminating expensive and time-consuming oxidation treatments while maintaining performance specifications.
Solution Approach 2:
The invention develops composite asphalt formulations that combine base asphalt with cost-effective polymer and wax additives. These composites achieve the desired physical properties at lower manufacturing costs compared to oxidation-based modification, providing an economically advantageous alternative for producing high-performance asphalt materials.
3Ease of manufacture
If recycled ground tire rubber is used in asphalt formulations, then cost effectiveness and environmental impact are improved, but processing difficulty and stability worsen
Solution Approach 1:
The patent uses waxes as intermediary substances that facilitate the incorporation of recycled ground tire rubber into asphalt formulations. The waxes act as dispersants and stabilizers, improving the processing characteristics and stability of GTR-containing asphalts while maintaining the cost-effectiveness and environmental benefits of using recycled rubber materials.
Solution Approach 2:
The invention creates composite formulations that combine recycled ground tire rubber with polymers and waxes to produce a stable, easy-to-process asphalt material. This composite approach mitigates the processing difficulties and stability issues associated with GTR alone, while preserving its economic and environmental advantages.
4Ease of manufacture
If recycled ground tire rubber is used in asphalt formulations, then cost effectiveness and environmental impact are improved, but stability worsens
Solution Approach 1:
The patent employs waxes as intermediary agents that enhance the stability of recycled ground tire rubber in asphalt formulations. These waxes prevent separation and settling of the rubber particles, ensuring long-term compositional stability while maintaining the cost-effectiveness and environmental benefits of using recycled rubber materials.
Solution Approach 2:
The invention develops stable composite formulations by combining recycled ground tire rubber with polymers and waxes. This composite structure ensures uniform distribution and long-term stability of the GTR particles within the asphalt matrix, eliminating the stability problems associated with GTR alone while preserving its economic and environmental advantages.
5Temperature
If existing wax additives are used to improve softening point and hardness, then these properties are improved, but emissions increase
Solution Approach 1:
The patent modifies the chemical composition parameters of asphalt through the addition of polymers and waxes, achieving the required softening point and hardness improvements without relying on high-temperature oxidation processes that generate harmful emissions. This approach reduces environmental impact while maintaining performance specifications.
Solution Approach 2:
The invention creates composite asphalt formulations that combine base asphalt with polymers and waxes in a manner that achieves desired physical properties without requiring emission-intensive oxidation treatments. These composite materials provide an environmentally friendly alternative to traditional modification methods.
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 addition of these waxes increases the softening point and hardness of asphalt, reduces oxidation time, and improves the performance grade, leading to more stable and durable asphalt products with reduced environmental impact and lower production costs.
Implementation Method 1
Incorporating waxes derived from the depolymerization of polymeric materials, such as polyethylene and polypropylene, into asphalt formulations
Implementation Method 2
the addition of the wax(es) improve(s) asphalt properties including increasing the softening point and/or hardness of the asphalt
Data Source
AI summary
Asphalt can be modified by polymers, oligomers, and waxes made from polymeric material. The addition of polymer, oligomer, or wax can increase the softening point of the asphalt, decrease the penetration of the asphalt, and/or shorten the oxidation of the asphalt. In some embodiments, polymer, oligomer, or wax is added to an oxidized asphalt. The polymer, oligomer, or wax can be made by catalytic depolymerization and/or thermal degradation of polymeric material. The polymeric material can be polystyrene, polypropylene, polyethylene, a combination of polypropylene and polyethylene or recycled plastics. In some embodiments, addition of the polymer, oligomer, or wax improves the performance grade of a paving asphalt binder alone or in combination with other modifiers such as ground tire rubber and polymers. The addition of wax can increase the high service temperature of the asphalt binder.