Silane-Modified Block Copolymer Asphalt Modifier
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Solution Overview
Problem
The existing asphalt modifiers, such as vinyl aromatic hydrocarbon-conjugated diene block copolymers, face challenges in compatibility with asphaltene, leading to extended processing times and decreased quality due to low solubility and poor mixing properties, which are not adequately addressed by current methods that modify molecular weight or add hydrophilic monomers.
Innovation Solution
Introducing a multifunctional group derived from silane coupling agents, such as (2-chloroethyl)methyl dichlorosilane, into the vinyl aromatic hydrocarbon-conjugated diene block copolymer to enhance compatibility and solubility, allowing for improved mixing and physical property enhancement in asphalt compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vinyl aromatic hydrocarbon-conjugated diene block copolymer is used as an asphalt modifier, then the physical properties of asphalt are improved, but the processing time and manufacturing time are remarkably extended due to poor compatibility with asphaltene
Solution Approach 1:
The patent introduces a multifunctional group containing a silane-based coupling agent into the block copolymer structure. This chemical modification changes the parameters of the modifier, specifically adding polar functional groups that enhance compatibility with asphaltene, thereby reducing processing time while maintaining improved physical properties of asphalt.
Solution Approach 2:
The patent creates a composite structure by combining the vinyl aromatic hydrocarbon-conjugated diene block copolymer with a silane-based coupling agent. This composite modifier integrates the elasticity-improving properties of the block copolymer with the compatibility-enhancing properties of the coupling agent, resolving the contradiction between physical property improvement and processing time reduction.
2Quantity of substance
If the amount of asphaltene in asphalt is increased due to advancement of oil refining facilities, then the compatibility with block copolymers is reduced, but this leads to extended processing time and decline in quality of asphalt
Solution Approach 1:
The silane-based coupling agent acts as an intermediary between the block copolymer and asphaltene. The coupling agent's polar functional groups interact with asphaltene, while its structure also interacts with the block copolymer, facilitating compatibility between these two components even when asphaltene content is high, thereby maintaining asphalt quality.
Solution Approach 2:
The patent modifies the chemical parameters of the block copolymer by introducing the multifunctional group containing the coupling agent. This parameter change adds polar characteristics to the otherwise non-polar block copolymer, enabling it to interact effectively with polar asphaltene molecules, thus maintaining manufacturing precision despite increased asphaltene quantity.
3Ease of operation
If existing methods such as adjusting molecular weight or adding hydrophilic monomers are used to improve compatibility, then mixing property with asphalt is somewhat improved, but there is no ultimate solution due to high variation in quality of asphalt
Solution Approach 1:
The patent systematically modifies the chemical parameters of the block copolymer by introducing a specific multifunctional group containing a silane-based coupling agent. This targeted parameter change provides a consistent chemical mechanism for improving compatibility, reducing the variation in modification effects across different asphalt batches and enhancing reliability.
Solution Approach 2:
The silane-based coupling agent serves as a reliable intermediary that consistently mediates between the block copolymer and asphalt components. This intermediary mechanism provides a uniform approach to improving mixing properties across varying asphalt qualities, achieving both ease of operation and reliability.
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 modified asphalt modifier exhibits excellent compatibility and workability, significantly improving low-temperature and high-temperature properties, storage stability, and manufacturing efficiency, with enhanced solubility and physical properties in asphalt compositions.
Implementation Method 1
a multifunctional group X which is derived from a coupling agent selected from (2-chloroethyl)methyl dichlorosilane, (3-chloropropyl)methyl dichlorosilane, (4-chlorobutyl)methyl dichlorosilane, (3-chloropropyl)propyl dichlorosilane, bis(3-chloropropyl) dichlorosilane and dichloro(chloromethyl) methylsilane
Data Source
AI summary
The present invention relates to an asphalt modifier including a main chain of a vinyl aromatic hydrocarbon-conjugated diene block copolymer, and more particularly, to an asphalt modifier capable of effectively improving low-temperature properties, high-temperature properties, storage stability, and the like of an asphalt composition due to excellent compatibility with the asphalt composition when a vinyl aromatic hydrocarbon-conjugated diene block copolymer containing a certain multifunctional group is used as the asphalt modifier, and an asphalt composition including the same.