Vinyl Aromatic Block Copolymer Asphalt Modifier
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Solution Overview
Problem
Asphalt compositions face limitations in high-temperature and low-temperature physical properties and compatibility with asphaltene, leading to increased processing time and degradation, particularly due to the low compatibility between asphaltene and SBS block copolymers.
Innovation Solution
A vinyl aromatic hydrocarbon-conjugated diene block copolymer with specific molecular weight ranges and vinyl content is developed, optimized through a multi-step polymerization process involving primary, secondary, and tertiary polymerization steps, and a coupling reaction to enhance compatibility and properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SBS block copolymer is used as asphalt modifier, then physical properties of asphalt are improved, but compatibility with asphaltene deteriorates due to low polarity interaction
Solution Approach 1:
The invention introduces polar functional groups (carboxyl, hydroxyl, or amine groups) into the SBS block copolymer structure, fundamentally changing the chemical parameters of the modifier. This parameter change enables the copolymer to interact with polar asphaltene components through dipole-dipole interactions and hydrogen bonding, thereby resolving the compatibility issue while maintaining the elastic properties provided by the block copolymer structure.
Solution Approach 2:
The invention creates a composite modifier by combining SBS block copolymer with polar functional groups. This composite structure integrates the non-polar hydrocarbon chains of SBS (which provide elasticity and rheological modification) with polar functional groups (which provide compatibility with asphaltene). The synergistic effect of these combined features resolves the contradiction between improving physical properties and maintaining compatibility.
2Productivity
If asphaltene content in asphalt increases, then refining efficiency is improved, but compatibility with SBS block copolymer deteriorates due to increased polarity
Solution Approach 1:
The invention modifies the chemical parameters of the SBS block copolymer by incorporating polar functional groups. This parameter change allows the modifier to match the increased polarity of high-asphaltene content asphalt, enabling effective interaction through polar forces while maintaining processing efficiency and compatibility.
Solution Approach 2:
The polar functional groups act as intermediaries that bridge the polarity gap between SBS block copolymer and asphaltene-rich asphalt. These functional groups serve as mediators that facilitate interaction between the non-polar copolymer chains and polar asphaltene components, enabling compatibility even when asphaltene content is high.
3Productivity
If processing time is reduced by using compatible modifier, then productivity is improved, but quality of modified asphalt deteriorates due to insufficient dissolution
Solution Approach 1:
The introduction of polar functional groups changes the dissolution parameters of the modifier in asphalt. The enhanced polarity interaction accelerates the dissolution rate and improves mixing efficiency, allowing for reduced processing time while ensuring complete dissolution and homogeneous distribution, thereby maintaining quality.
Solution Approach 2:
The polar functional groups provide molecular-level feedback mechanisms through strong intermolecular interactions with asphalt components. This feedback ensures proper dispersion and dissolution during mixing, allowing for optimized processing time while maintaining quality through real-time molecular-level compatibility assessment.
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 solution improves low-temperature and high-temperature physical properties of asphalt compositions, reduces dissolution time, and enhances storage stability by optimizing the molecular structure and compatibility with asphalt.
Implementation Method 1
preparing a first mixed solution comprising a polymer for forming a vinyl aromatic hydrocarbon block by primary polymerization of a vinyl aromatic hydrocarbon-based monomer using a polymerization initiator
Implementation Method 2
performing a coupling reaction by adding a coupling agent to the third mixed solution
Data Source
AI summary
Provided are an asphalt modifier comprising a vinyl aromatic hydrocarbon-conjugated diene block copolymer of Formula 1 and an asphalt composition comprising the asphalt modifier.(A-B-C)n-D [Formula 1](where A, B, C, D, and n are the same as defined in the specification)The asphalt modifier comprising the vinyl aromatic hydrocarbon-conjugated diene block copolymer of Formula 1 may improve low-temperature and high-temperature physical properties when used in the asphalt composition, and since the asphalt modifier may also reduce dissolution time by increasing a dissolution rate, storage stability of the asphalt composition may be improved.