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Extruded Polystyrene Foam: Butylene-Blown Logs 20 Inches Across (McIntire, Dow 1948, Ex. 4)
Extruded polystyrene foam blown with a butylene gas fraction. 300 lb of polystyrene and about 130 lb of the fraction stand two days at 110 °C under 265 psi. Opened again and again, the tower let out foam logs 20 inches across and 20 feet long, weighing only 0.8 lb per cubic foot. Unknown: a source for the butylene fraction, linked to an unknown head.
Source: O. R. McIntire (Dow), US 2,450,436 (1948), Example 4. Picture: the patent's drawing.
Advanced
3 days
Instructions
1
1
Charge the tower with polystyrene
Charge the tower with polystyrene
Charge a high-pressure tower with 300 lb of granular polystyrene.
Materials for this step:
Polystyrene300 lbsTools needed:
Pressure Reactor
Balance Scale
Rubber Gloves2
2
Add the butylene fraction
Add the butylene fraction
Add about 130 lb of a cracked-oil gas fraction that is about 87 % normal butylenes, with some butanes and butadiene, under pressure. Unknown: a source for this fraction. Flammable gas: no flames, strong ventilation.
Materials for this step:
Butylene Cracked-Gas Fraction130 lbsTools needed:
Pressure Gas CylinderPressure Reactor
Chemical Splash Goggles3
3
Heat two days at 110 °C
Heat two days at 110 °C
Close the tower and heat it at 110 °C for two days. The gauge pressure stays at 265 psi.
Tools needed:
Pressure Reactor
Thermometer - Lab4
4
Let out logs through a 3.25 inch outlet
Let out logs through a 3.25 inch outlet
Open and close the 3.25 inch outlet near the bottom again and again. Each portion swells into a foam log 20 inches across and about 20 feet long, with fine, even, closed cells, weighing 0.8 lb per cubic foot.
Tools needed:
Pressure ReactorChemical Splash GogglesRubber Gloves5
5
Saw into boards
Saw into boards
When the foam has set, saw it lengthwise into slabs (ours: a woodworking saw).
Tools needed:
Woodworking SawRubber GlovesMaterials
2- 300 lbsPlaceholder
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Tools Required
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