Rubber-Containing Asphalt Composition for Roofing Shingles
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Solution Overview
Problem
Asphalt that does not meet minimum specifications for roofing applications is discarded as waste, due to the challenges in formulating compositions that incorporate rubber and asphalt effectively.
Innovation Solution
A method involving the use of ground tire rubber or devulcanized rubber combined with unoxidized asphalt, where the rubber component is mixed with unoxidized asphalt and then oxidized to create an oxidized asphalt composition suitable for roofing shingles, without the need for catalysts or re-refined engine oil bottoms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rubber is incorporated into asphalt to expand material sources and reduce waste, then the versatility and waste reduction are improved, but the formulation complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies parameter changes by specifying precise mixing temperatures (300-425°F) and oxidation temperatures (200-600°F) to achieve optimal rubber-asphalt composition. By controlling these thermal parameters, the formulation complexity is managed through standardized processing conditions, enabling versatile rubber-asphalt compositions to be produced consistently.
Solution Approach 2:
The patent utilizes waste rubber materials (ground tire rubber, devulcanized rubber) as the rubber component, replacing expensive traditional rubber sources. This principle allows the formulation to accept various waste rubber types without requiring sophisticated formulation adjustments, thereby reducing formulation complexity while expanding material versatility.
2Ease of manufacture
If conventional asphalt blending methods are used to incorporate rubber, then the ease of manufacture is maintained, but the product fails to meet roofing application specifications
Solution Approach 1:
The patent applies preliminary action by using unoxidized asphalt as the base material before mixing with rubber. This preliminary preparation of the asphalt state enables subsequent oxidation to occur at controlled temperatures (200-600°F), ensuring the final product meets roofing specifications while maintaining ease of manufacture through a straightforward two-step process.
Solution Approach 2:
The patent achieves specification compliance by implementing specific parameter ranges: mixing temperature of 300-425°F and oxidation temperature of 200-600°F. These controlled parameter changes transform conventional blending into a specification-compliant process, maintaining manufacturing simplicity while ensuring product reliability for roofing applications.
3Productivity
If catalysts and re-refined engine oil bottoms are used in the process, then the productivity and efficiency are improved, but the harmful factors and environmental impact increase
Solution Approach 1:
The patent converts the harmful effect of requiring catalysts into a benefit by eliminating them entirely. The oxidation process proceeds without catalysts using controlled thermal conditions (200-600°F), transforming a potentially harmful catalytic process into an environmentally benign thermal process that maintains productivity while eliminating harmful factors.
Solution Approach 2:
The patent replaces expensive and environmentally problematic catalysts and re-refined engine oil bottoms with simple thermal oxidation processes. This substitution maintains process efficiency (productivity) while eliminating harmful chemical additives, aligning with environmental sustainability goals.
4Reliability
If rubber-containing asphalt compositions are produced to meet roofing specifications, then the reliability for roofing applications is improved, but the loss of unoxidized asphalt and material waste increases
Solution Approach 1:
The patent minimizes asphalt waste by precisely controlling the oxidation temperature range (200-600°F), which optimizes the transformation of unoxidized asphalt into the final product. This parameter control ensures maximum material utilization while maintaining roofing specification compliance, reducing the loss of valuable asphalt material.
Solution Approach 2:
The patent recovers and utilizes unoxidized asphalt as a valuable resource by incorporating it into the rubber-asphalt composition through controlled oxidation. Rather than discarding unoxidized asphalt as waste, the process recovers it and transforms it into specification-compliant roofing material, thereby reducing material loss.
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 production of rubber-containing asphalt compositions that meet roofing application specifications, utilizing a wide range of rubber types and avoiding the use of catalysts or re-refined engine oil bottoms, thus reducing waste and expanding material sources.
Implementation Method 1
oxidizing the unoxidized asphalt composition to obtain an oxidized asphalt composition
Data Source
AI summary
Some embodiments relate to a method for producing a rubber-containing asphalt composition. The method for producing the rubber-containing asphalt composition comprises obtaining a rubber component; obtaining an unoxidized asphalt; mixing the rubber component and the unoxidized asphalt to obtain an unoxidized asphalt composition; oxidizing the unoxidized asphalt composition to obtain an oxidized asphalt composition; and forming a roofing shingle from the oxidized asphalt composition.