Polymer-Bitumen Primary Mixtures for Stable High-Concentration Dispersion
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Solution Overview
Problem
The existing production methods for bitumen-polymer binders are costly, environmentally impactful, and require expensive and complex infrastructure due to the difficulty in dispersing polymers into bitumen, leading to inefficient use of resources and suboptimal polymer concentration in the final product.
Innovation Solution
A primary mixture comprising at least 25% by weight of polymer, a thermoplastic tackifying resin, and alkyl esters of C16-C18 fatty acids, which can be easily mixed with bitumen to form a stable and highly concentrated bitumen-polymer composition without the need for heavy mixing devices, and can be stored and transported without degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional progressive addition of polymer to hot bitumen is used, then polymer dispersion is achieved, but the process requires expensive disperser/crusher equipment and long dispersion times (1-3 hours)
Solution Approach 1:
The patent applies preliminary action by pre-dispersing the polymer in a counting oil (petroleum, vegetable, or mineral origin) before adding it to the bitumen. This pre-dispersion step creates a ready-to-use concentrate that can be easily incorporated into hot bitumen without requiring expensive disperser/crusher equipment during the actual bitumen modification process. The polymer is pre-distributed in the counting oil at concentrations of 3-7% by weight relative to bitumen, eliminating the need for complex infrastructure at the bitumen plant.
2Manufacturing precision
If counting oil is used to facilitate polymer dispersion, then dispersion quality improves, but production costs increase and environmental impact worsens
Solution Approach 1:
The patent applies parameter changes by specifying particular types of counting oil with desired properties. It mentions petroleum, vegetable, or mineral origin oils, with vegetable oils being a preferred option to reduce environmental impact. The oil is used at controlled concentrations (3-7% by weight relative to bitumen) to achieve effective dispersion while minimizing unnecessary resource consumption and environmental burden. This parameter optimization balances dispersion quality with environmental considerations.
3Productivity
If polymer concentration in primary mixture is increased, then transport efficiency improves, but mixture stability during storage deteriorates
Solution Approach 1:
The patent applies the intermediary principle by using counting oil as a mediator between the polymer and the bitumen. The counting oil serves as a stable carrier that maintains polymer dispersion at high concentrations (3-7% by weight relative to bitumen) without causing aggregation or instability during storage and transport. The oil's properties as a solvent or dispersant medium allow the polymer to remain uniformly distributed even at elevated concentrations, preventing phase separation or gelation that would otherwise occur.
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
This approach reduces production costs, simplifies logistics, and results in bitumen-polymer compositions with improved consistency and mechanical properties, enabling the production of high-polymer concentration bitumen-polymer compositions that are stable and easily incorporated into bitumen, thus facilitating the creation of durable road coatings.
Implementation Method 1
Heating, emulsification and/or fluxing (or fluidization) using bitumen solvents (fluxants) are commonly used means to obtain the desirable consistency for the application
Implementation Method 2
The rheology of this mixture must be adapted to the application on pavements to form a road surface
Implementation Method 3
This operation, which aims to disperse the polymer within the bitumen, hot, within a mechanical disperser/crusher
Implementation Method 4
Once applied, these mixes or coatings must then build cohesion to transform into a road surface with the expected durable mechanical properties
Data Source
AI summary
The aim of the invention is to provide, at a lower cost, novel primary mixtures that can be used for preparing polymer bitumens. For this purpose, the primary mixture according to the invention comprises: (a) at least 25 % by weight, preferably 25 to 80 % by weight, of polymer, (b) at least one thermoplastic tackifying resin having an average molecular mass of 100 to 3,000 g/mol, (c) and/or one or more mono-alkyl — preferably methyl — esters of fatty acids at C16-C18, in particular sunflower oil, linseed oil, rapeseed oil, soybean oil, and/or sunflower oil that is optionally isomerised; the ester (c) necessarily being present when the tackifying resin (b) has an acid value measured according to standard NF EN ISO 660 of less than 50 mg KOH/g. The invention also concerns the polymer bitumens, emulsions and coatings/coated products obtained from this primary mixture, as well as the methods for preparing same.