With
Asaprene™ T-430
contents of up to about 5 wt%, as shown here, as blending
progresses the elastomer gradually forms an extremely
fine-particle, uniform dispersion throughout the straight
asphalt matrix.
Blend ratio: Asaprene™ T-430/straight
asphalt = 5/95 wt%; blending temp.: 180°C
|
Blending time |
1.5
hr |
3
hr |
6
hr |
|
Softening
point (°C)
|
92
|
73
|
62
|
|
Elastomer
area (%)
|
13
|
15
|
14
|
|
Mean
particle size (µm2)
|
1.1
|
0.4
|
0.3
|
|
Electron
micrographs
|
 |
 |
 |
|
Dark regions: elastomer; light regions:
asphalt.
With Asaprene™ T-430
addition of about 8 wt% or more, the elastomer absorbs
oil from the straight asphalt as it disperses, grows
in relative area, and takes on a matrix configuration.
Blend ratio: Asaprene™ T-430/straight
asphalt = 8/92 wt%; blending temp.: 180°C
|
Blending time |
1.5
hr |
3
hr |
6
hr |
|
Softening
point (°C)
|
109
|
109
|
107
|
|
Elastomer
area (%)
|
26
|
26
|
27
|
|
Electron
micrographs
|
 |
 |
 |
|
Dark regions: elastomer; light regions:
asphalt. |
