Asphalt Composition Using Monomeric MDI Crosslinking
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Solution Overview
Problem
Current asphalt compositions face limitations such as limited useful temperature interval, low elastic response, and susceptibility to permanent deformation, which affect their performance and stability across varying temperatures.
Innovation Solution
An asphalt composition incorporating monomeric MDI as a thermosetting reactive compound, heated and reacted with asphalt under specific conditions to enhance its physical properties, including increased useful temperature interval, elastic response, and reduced potential for permanent deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric MDI or polymeric MDI based prepolymer is used as modifier, then the asphalt composition shows improved physical properties, but the reaction time exceeds 2 hours and the composition requires longer processing time
Solution Approach 1:
The patent changes the key parameter from polymeric MDI to monomeric MDI, which fundamentally alters the reaction kinetics. Monomeric MDI reacts much faster with asphaltene nitrogen groups, reducing reaction time to below 2 hours while achieving comparable or superior physical property improvement through rapid crosslinking.
Solution Approach 2:
The patent extracts the polymeric structure from MDI and uses only the monomeric form. This extraction of the polymeric component eliminates the slow reaction time associated with polymer chains while retaining the crosslinking functionality needed to improve asphalt physical properties.
2Ease of manufacture
If thermoplastic asphalt is used, then the material is easy to process, but it shows property variation over temperature range and susceptibility to permanent deformation
Solution Approach 1:
The patent creates a composite material system by combining thermoplastic asphalt with monomeric MDI crosslinking agent. The resulting composition has thermosetting crosslinked structures embedded in the thermoplastic matrix, providing both processability and temperature stability through the dual-character composite structure.
Solution Approach 2:
The patent changes the molecular structure parameter by introducing crosslinked networks through monomeric MDI reaction with asphaltenes. This structural transformation converts the material from purely thermoplastic to a hybrid system with thermosetting characteristics, eliminating temperature-dependent property variation and permanent deformation.
3Strength
If polymeric MDI is used as crosslinking agent, then crosslinking efficiency is improved, but the reaction time is extended beyond 2 hours
Solution Approach 1:
The patent changes the molecular weight parameter of MDI from polymeric to monomeric form. This parameter change increases reaction speed and productivity while maintaining crosslinking efficiency, as monomeric MDI can more rapidly diffuse and react with asphaltene nitrogen groups to form crosslinked networks.
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 asphalt composition exhibits improved stability and performance across a broader temperature range, with enhanced elastic response and load rating, and reduced risk of permanent deformations, making it suitable for high-traffic conditions.
Implementation Method 1
an asphalt composition comprising monomeric MDI as thermosetting reactive compound
Implementation Method 2
the reaction mixture is stirred at a temperature in the range of from 110 to 190° C. for at least 2,5 h wherein the reaction is under an oxygen atmosphere
Implementation Method 3
Heating up the starting asphalt to a temperature of from 110 to 190° C.
Data Source
AI summary
An asphalt composition comprising 0.1 to 10.0 wt.-% monomeric methylene diphenyl diisocyanate (MDI) based on the total weight of the composition, wherein the monomeric MDI is carbodiimide modified and wherein the weight percentage of 4,4′-MDI in the carbodiimide modified monomeric MDI is in the range of from 65 to 85% and the weight percentage of carbodiimide is in the range of from 15 to 35% in the carbodiimide modified monomeric MDI; wherein at least 18% by weight based on the total weight of the composition are particles with a sedimentation coefficient above 5000 Sved in a white spirit solvent.