Ester Fluxing Agents for Bituminous Binders
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Solution Overview
Problem
Current fluxing agents for hydrocarbon binders in bituminous products either have significant environmental and health impacts or fail to provide adequate cohesion and adhesion to solid mineral particles, especially under moderate to heavy traffic and climatic variations.
Innovation Solution
The use of specific volatile compounds of formula (R1-X-R-Y-R2), which reduce the viscosity of hydrocarbon binders and enhance wettability of solid mineral particles without the drawbacks of traditional fluxing agents, ensuring effective adhesion and cohesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If petroleum-based fluxing agents are used to reduce viscosity of hydrocarbon binder, then handling and wettability are improved, but harmful volatile emissions and flammability risks increase
Solution Approach 1:
The patent changes the chemical composition parameters of the fluxing agent by using ester compounds with specific molecular structures (formula I) that have controlled volatility. These esters provide the necessary viscosity reduction while minimizing harmful emissions through optimized chemical composition rather than relying on traditional petroleum-based volatile compounds.
Solution Approach 2:
The patent employs volatile ester compounds that temporarily reduce viscosity during application and then evaporate, similar to traditional fluxing agents. However, these esters are designed to be environmentally benign and non-flammable, replacing harmful petroleum-based fluxes with safer alternative compounds that complete their function and dissipate without leaving harmful residues.
2Object-affected harmful factors
If non-fossil-based natural fluxing agents are used to eliminate harmful emissions, then environmental impact is reduced, but adhesion and cohesion performance deteriorate
Solution Approach 1:
The patent modifies the chemical parameters of natural ester compounds by selecting specific esters with controlled molecular weights, saturation levels, and volatility characteristics. These parameter adjustments enable the esters to provide both environmental benefits and adequate adhesion performance, bridging the gap between eco-friendly materials and performance requirements.
Solution Approach 2:
The patent creates a composite fluxing system by combining multiple ester compounds with different properties (e.g., varying degrees of saturation, different molecular weights) to achieve a balance between environmental compatibility and performance. This composite approach allows optimization of both adhesion and cohesion characteristics while maintaining low environmental impact.
3Ease of operation
If volatile fluxing agents are used to reduce viscosity temporarily, then ease of application is improved, but safety and environmental conditions deteriorate
Solution Approach 1:
The patent changes the physical and chemical parameters of the fluxing agents by selecting esters with specific boiling points, vapor pressures, and flash points. These parameter modifications enable the fluxing agents to volatilize sufficiently for easy application while remaining below the flammability threshold, achieving both ease of application and safety.
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
These compounds provide a temporary reduction in viscosity and improved wettability, leading to high-performance bituminous binders with enhanced penetrability, ball-ring temperature, and Fraass brittleness point, suitable for various traffic conditions and climatic variations.
Implementation Method 1
These fluxants, among other things, reduce their viscosity. They can be derived from petroleum, petrochemicals, coal chemicals, or even plant-based sources... Such fluxants are described for example in applications FR 2 910 477, EP 0 900 822, FR 2 721 043 or FR 2 891 838... With non-volatile fluxing agents such as the aforementioned oils, the increase in binder consistency in the final product (after spreading or coating) does not occur through evaporation
Implementation Method 2
This typically results from radical reactions, where unsaturated fatty acid chains react in the presence of atmospheric oxygen. These reactions, which can be catalyzed by the addition of drying agents such as metallic salts, involve the formation of peroxide (-OO-) bridges on the unsaturated chains. These bridges are unstable and lead to the formation of free radicals, which in turn react with other unsaturates on other chains.
Implementation Method 3
unsaturated fatty acid chains react in the presence of atmospheric oxygen
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to the use, as a fluxing agent, of at least one compound with formula (I) R1-X-R-Y-R2 (I), wherein: R1 and R2, identical or different, are straight or branched C2-C11 hydrocarbon chains; each of -X- and -Y-, identical or different, is a -0-(C=0)-, -(C=0)-0- or -N R'-(C=0)- group, where R' is a hydrogen atom or a C1- C4 alkyl radical, or -(C=0)-N R'- where R' is a hydrogen atom or a C1-C4 alkyl radical, the -R- group is a divalent straight or branched C1-C10 hydrocarbon chain, possibly interrupted by one or more oxygen atoms in a composition comprising a bituminous binder for the preparation of a bituminous product based on mineral solid particles in contact with said bituminous binder, wherein said compound of formula (I) is present in said composition when said composition is placed in contact with said mineral solid particles.