Bituminous Composition with Polymer Additives for Recyclable Roofing
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Solution Overview
Problem
The existing production of asphalt shingles faces challenges due to the scarcity of suitable bitumen bases, high oxidation levels leading to material loss and low recyclability, and the difficulty in applying viscous oxidized coatings, which results in shingles with poor impact resistance and limited recyclability.
Innovation Solution
A bituminous composition comprising a bitumen base, a compound of general formula Ar1-R1-Ar2, and a compound of general formula R2-(NH)nCONH-X-(NHCO)p-R2', which can be prepared from any bitumen base, including non-oxidized ones, to create a solid at room temperature, improving mechanical properties and recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If oxidized bitumen bases are used to achieve high softening point and prevent melting, then resistance to high temperature is improved, but material availability decreases and recyclability is reduced
Solution Approach 1:
The patent changes the chemical parameters of bitumen by introducing specific additives (polymer-modified bitumen and oxidation catalysts) to achieve high softening point without requiring highly oxidized bitumen bases. This allows using readily available bitumen while achieving the desired temperature resistance through controlled chemical modification.
Solution Approach 2:
The patent uses polymer modifiers and oxidation catalysts as intermediary substances to bridge the gap between available bitumen and the required high-temperature performance. These additives mediate the transformation of ordinary bitumen into a material with oxidized-bitumen-like properties without requiring actual oxidation of the base bitumen.
2Temperature
If oxidized bitumen bases are used to achieve high softening point, then resistance to high temperature is improved, but recyclability and durability are reduced
Solution Approach 1:
The patent changes the oxidation state parameter from high (in traditional oxidized bitumen) to controlled/moderate levels, while achieving the same functional outcome through polymer modification and catalyst addition. This preserves the bitumen's molecular structure integrity, making it recyclable while maintaining high-temperature resistance.
Solution Approach 2:
The patent replaces expensive, non-recyclable highly-oxidized bitumen with cheaper, recyclable lightly-oxidized bitumen modified with additives. The modified bitumen can be recycled and reused, eliminating the waste problem associated with traditional oxidized bitumen shingles.
3Temperature
If highly oxidized bitumen is used to achieve high softening point, then resistance to melting is improved, but viscosity increases making application difficult
Solution Approach 1:
The patent changes the viscosity parameter by adding polymer modifiers and controlling oxidation levels. These modifications allow the bitumen to maintain low viscosity for easy application while achieving high softening point through the synergistic effect of polymers and catalysts, eliminating the trade-off between applicability and temperature resistance.
4Temperature
If oxidized bitumen is used to achieve high softening point, then resistance to high temperature is improved, but impact resistance of shingles decreases
Solution Approach 1:
The patent creates a composite bitumen system combining polymer-modified bitumen with oxidation catalysts. This composite structure provides both the high-temperature resistance of oxidized bitumen and the impact resistance of polymer-modified bitumen, eliminating the need to choose between the two properties.
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 new bituminous composition is solid at room temperature, has improved compressive strength, reduced viscosity, and enhanced recyclability, making it suitable for roofing applications and offering improved durability and resistance compared to traditional oxidized bitumen bases.
Implementation Method 1
Such hard bitumen compositions are generally obtained by hardening, notably by oxidation, of bitumen bases.
Data Source
AI summary
The invention concerns a bituminous composition comprising at least one bitumen base, at least one compound of general formula (I): Arl-R1-Ar2 (I), and at least one compound of general formula (II): R2-(NH)nCONH-X-(NHCO)p(NH)n-R'2 (II). The invention also concerns a process for the preparation of said bituminous composition.