Thermoreversible Bituminous Composition for Viscosity Control
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Solution Overview
Problem
Bitumen's high viscosity at operating temperatures due to crosslinking increases energy expenditure and modifies its properties, while transportation and storage at high temperatures are hazardous and energy-intensive, and existing solutions like bitumen pellets with coatings or additives either fail to prevent creep or alter bitumen properties.
Innovation Solution
A novel bituminous composition comprising a mixture of bitumen and specific molecules of general formulas (I) and (II)/(III), which form a thermoreversible network, maintaining hardness and consistency at operating temperatures and reducing viscosity at application temperatures, and are solid at ambient temperature to prevent adhesion and agglomeration during transportation and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If crosslinked polymers are added to bitumen to improve elastic properties, then elasticity is improved, but viscosity becomes very high
Solution Approach 1:
The patent employs thermoreversible crosslinking that changes its state based on temperature. At application temperatures, the crosslinks are active providing elasticity, but at storage temperatures they dissociate reducing viscosity. This dynamic parameter change allows the bituminous composition to exhibit different rheological properties under different thermal conditions, resolving the contradiction between needing high elasticity and low viscosity.
Solution Approach 2:
The crosslinking system is designed to be dynamic rather than static. The crosslinks form and break reversibly in response to temperature changes, allowing the material to adapt its structure. During application, the crosslinked network provides the needed elastic properties, while during storage the broken crosslinks allow free flow and low viscosity, thus resolving the contradiction between these two opposing requirements.
2Strength
If crosslinked bituminous compositions are used to improve elastic properties, then good elastic properties are achieved, but application temperature must be increased
Solution Approach 1:
The patent utilizes temperature-dependent parameter changes in the crosslinking system. The crosslinks are designed to be stable at application temperatures (providing elasticity) but unstable at storage temperatures (reducing viscosity). This allows the material to maintain good elastic properties without requiring excessively high application temperatures, as the crosslinking is thermally activated rather than permanently fixed.
3Ease of operation
If bitumen is transported and stored at high temperatures to maintain fluidity, then handling is easier, but energy expenditure increases and properties may deteriorate
Solution Approach 1:
The patent exploits phase transitions of the crosslinking system based on temperature. At storage temperatures, the crosslinks break and the bitumen transitions to a low-viscosity fluid state that can be handled easily without heating. At application temperatures, the crosslinks reform and the material transitions to a high-viscosity elastic state. This thermoreversible phase transition eliminates the need for continuous heating during storage and transport, reducing energy expenditure while maintaining ease of handling.
4Stability of the object's composition
If bitumen is transported at high temperatures to maintain fluidity, then fluidity is maintained, but transportation becomes hazardous and regulated
Solution Approach 1:
The patent employs thermoreversible phase transitions in the crosslinking system. During storage and transport, the crosslinks are broken at lower temperatures, allowing the bitumen to maintain adequate fluidity without requiring high-temperature heating. This eliminates the transportation hazards associated with hot bitumen while preserving the necessary fluidity for handling. The crosslinks reform at application temperatures to provide the required elastic 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 bituminous composition achieves improved mechanical properties, reduced viscosity at application temperatures, and prevents adhesion and agglomeration, allowing for efficient handling and storage at ambient temperature without degrading the bitumen's properties over time.
Implementation Method 1
a novel bituminous composition comprising a mixture of bitumen and specific molecules of general formulas (I) and (II)/(III), which form a thermoreversible network
Implementation Method 2
reducing viscosity at application temperatures
Data Source
AI summary
The present invention relates to bituminous compositions comprising molecules of formula (I), (II) and/or (III). The invention also relates to the use of said bitumen compositions in the fields of road applications, particularly in the production of road binders and roadways in general, as well as in the fields of industrial applications. The invention also relates to a method for producing said bituminous compositions. The invention further relates to novel molecules that can be used in particular in the formulation of bituminous compositions.