Asphalt Composition Block Copolymer Mixing Temperature
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Solution Overview
Problem
Existing asphalt compositions face challenges in achieving low mixing temperatures and viscosity while maintaining high stripping resistance of aggregates, as previous methods are inefficient and prone to thermal degradation.
Innovation Solution
An asphalt composition incorporating 1% to 15% by mass of a specific block copolymer blend, comprising vinyl aromatic and conjugated diene monomer units, which controls mixing temperature, viscosity, and polymer degradation, and enhances aggregate stripping resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If additives such as foaming agents, water, saturated fatty acid, or phosphoric acid are added to decrease mixing temperature, then the production temperature of asphalt composition is reduced, but fine bubbles become difficult to control, aggregate stripping resistance deteriorates, and thermal degradation occurs
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific block copolymer with defined molecular weight (10,000-100,000) and styrene content (20-40 mass%), replacing conventional additives like foaming agents and water. This parameter change enables temperature reduction while avoiding the harmful effects of previous additives on aggregate stripping resistance and fine bubble control
Solution Approach 2:
The patent uses a composite block copolymer structure consisting of styrene blocks and butadiene blocks (S-B block copolymer), combining the properties of both monomers to achieve both low-temperature processing and high stripping resistance. The specific composition ratio and molecular weight control the composite material's performance
2Ease of manufacture
If additives are added to reduce viscosity, then the ease of paving is improved, but thermal degradation occurs depending on the type of additive
Solution Approach 1:
The patent optimizes the molecular weight parameter of the block copolymer (10,000-100,000) and styrene content (20-40 mass%) to achieve the desired viscosity for ease of paving while selecting materials resistant to thermal degradation, avoiding the use of additives that cause degradation
Solution Approach 2:
The patent replaces complex multi-component additive systems with a single block copolymer that provides multiple functions (viscosity control, temperature reduction, stripping resistance), simplifying the formulation and reducing thermal degradation risks
3Reliability
If conventional polymers are added to improve asphalt properties, then the performance is enhanced, but the production time increases and cost increases
Solution Approach 1:
The block copolymer serves multiple functions simultaneously: it acts as a viscosity modifier, temperature reducer, and stripping resistance enhancer. This multi-functionality eliminates the need for multiple separate additives, reducing production time and simplifying the formulation process while maintaining enhanced asphalt performance
Data Source
AI summary
The asphalt composition of the present invention is an asphalt composition comprising 1% to 15% by mass of a block copolymer (a) and an asphalt (c), wherein the block copolymer (a) comprises a specific block copolymer (a-1) and a specific block copolymer (a-2) in specific amounts, wherein the content of a vinyl aromatic monomer unit in the block copolymer (a) is 34% by mass or more and 55% by mass or less, the number average molecular weight of the block copolymer (a-1) is in the range of 20,000 to 73,000, and the number average molecular weight of the block copolymer (a-2) is 1.5 to 5.0 times higher than the number average molecular weight of the block copolymer (a-1).