Block Copolymer Crumb Aspect Ratio Control for Asphalt Transport
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Solution Overview
Problem
Block copolymer crumbs face issues with increased specific surface area leading to deterioration in crumb-blocking ability and reduced transport efficiency, while maintaining excellent solubility and oil absorption ability.
Innovation Solution
A block copolymer crumb with a specified shape, comprising polymer blocks with specific vinyl aromatic and conjugated diene monomer units, is developed, with controlled aspect ratio, volume, weight, and specific gravity to enhance blocking resistance and transport efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the specific surface area of block copolymer crumb is increased to improve solubility and oil absorption ability, then solubility and oil absorption ability are improved, but crumb-blocking ability deteriorates and transport efficiency is reduced
Solution Approach 1:
The invention changes the geometric parameters of the crumb by controlling the aspect ratio to fall within a specific range (0.5 to 2.0). This parameter optimization allows the crumb to maintain adequate surface area for solubility and oil absorption while preventing excessive surface area that would cause blocking and transport issues.
Solution Approach 2:
The invention introduces asymmetry in the crumb shape by specifying an aspect ratio range that prevents both overly flat and overly elongated shapes. This asymmetric control optimizes the balance between surface area exposure and flow characteristics, resolving the contradiction between solubility enhancement and transport efficiency.
2Area of stationary object
If the specific surface area of block copolymer crumb is increased to improve solubility and oil absorption ability, then solubility and oil absorption ability are improved, but crumb-blocking ability deteriorates
Solution Approach 1:
The invention optimizes the geometric parameters by controlling the aspect ratio within a specific range (0.5 to 2.0), which prevents crumb particles from becoming too flat or too elongated. This parameter control maintains adequate surface area for solubility while preventing the shape conditions that lead to blocking and reliability issues.
Solution Approach 2:
The invention uses asymmetric shape control through aspect ratio specification to prevent both extremes (too flat or too elongated). This asymmetric optimization ensures the crumb maintains sufficient surface area for chemical interactions while avoiding the shape conditions that cause blocking problems.
3Reliability
If the aspect ratio of block copolymer crumb is controlled to improve blocking resistance, then blocking resistance is improved, but solubility and oil absorption ability may be reduced
Solution Approach 1:
The invention optimizes the aspect ratio parameter within a balanced range (0.5 to 2.0) that simultaneously achieves blocking resistance and maintains adequate surface area. This parameter optimization prevents both too-flat shapes (which block) and too-elongated shapes (which have insufficient surface area), resolving the contradiction between blocking resistance and solubility.
Data Source
AI summary
To provide a block copolymer crumb that is not only excellent in solubility and oil absorption ability, but also suppressed in blocking and excellent in transport efficiency. A crumb of a block copolymer or its hydrogenated product, including a polymer block A mainly containing a vinyl aromatic monomer unit, a polymer block B mainly containing a conjugated diene monomer unit and/or a polymer block C including a vinyl aromatic monomer unit, and a conjugated diene monomer unit, in which the following (1) to (6) are satisfied: (1) an average weight value per crumb is 0.0080 to 0.0500 g, (2) an average aspect ratio value per crumb is 1.00 to 3.50, (3) an average volume value per crumb is 18.0 to 110 mm3, (4) an average specific gravity value per crumb is 2.0 × 10-4 to 1.0 × 10-3 g/mm3, (5) a component passing through a sieve with an aperture of 3.35 mm corresponds to 41% by mass or more of the entire crumb, and (6) a melt flow rate of the crumb is 0.3 g/10 min or less in a G condition.