Block Copolymer Asphalt Composition Softening Point
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Solution Overview
Problem
Existing asphalt compositions fail to achieve a high enough softening point and sufficient workability, particularly in applications with increased vehicle traffic and speed, where higher mechanical strength and abrasion resistance are required.
Innovation Solution
A polymer composition comprising a specific structure with a polymer block (A) primarily made of vinyl aromatic monomers and a polymer block (B) containing conjugated diene and vinyl aromatic monomers, with controlled hydrogenation levels and molecular weight, is used to enhance the softening point and workability of asphalt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the molecular weight of block copolymers is increased to improve mechanical strength and softening point, then the softening point and mechanical strength are improved, but the workability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight of the block copolymer within a specific range (50,000-400,000), the styrene content (20-60%), and the Bragg spacing (27-50 nm). These parameter optimizations enable the asphalt composition to achieve a high softening point while maintaining good workability, resolving the contradiction between improving thermal properties and preserving processing performance
2Temperature
If aromatic oil or cross-linking agents are added to raise the softening point, then the softening point is improved, but the complexity of the composition and potential harmful effects increase
Solution Approach 1:
The patent extracts and eliminates the need for aromatic oils and cross-linking agents by using a specifically designed block copolymer with controlled molecular weight and structure. This approach achieves the desired high softening point without introducing the harmful factors and composition complexity associated with traditional additives, thereby improving the environmental compatibility and simplicity of the asphalt composition
3Strength
If the molecular weight of block copolymers is increased to improve mechanical strength, then the mechanical strength and abrasion resistance are improved, but the workability and flexibility deteriorate
Solution Approach 1:
The patent optimizes mechanical strength while preserving workability by controlling multiple parameters simultaneously: molecular weight (50,000-400,000), styrene content (20-60%), and Bragg spacing (27-50 nm). This multi-parameter optimization ensures that the asphalt composition achieves enhanced mechanical strength and abrasion resistance without sacrificing workability or flexibility
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 polymer composition significantly improves the softening point and workability of asphalt, providing better mechanical strength, abrasion resistance, and recovery after tension, while maintaining flexibility and high-temperature storage stability.
Implementation Method 1
the polymer has a polymer block (A) comprising principally a vinyl aromatic monomer unit, and a polymer block (B) comprising a conjugated diene monomer unit and a vinyl aromatic monomer unit, and has a Bragg spacing of 27 nm or larger and 50 nm or smaller
Data Source
AI summary
The present invention provides a polymer comprising conjugated diene monomer units and vinyl aromatic monomer units, whereinthe polymer has a polymer block (A) comprising principally vinyl aromatic monomer units, and a polymer block (B) comprising conjugated diene monomer units and vinyl aromatic monomer units, andhas a Bragg spacing of 27 nm or larger and 50 nm or smaller.