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Extruded Polystyrene Foam: Propylene-Blown Log Let Out at 40 °C (McIntire, Dow 1948, Ex. 3, Test 1)
Extruded polystyrene foam blown with a propylene gas fraction instead of methyl chloride. Polystyrene stands two days at 40 °C with the propylene under pressure and becomes a gel. Let out at 40 °C (200 psi in the tower), it swelled into a log 8 inches across, weighing 7.7 lb per cubic foot, with coarse but uniform cells.
Source: O. R. McIntire (Dow), US 2,450,436 (1948), Example 3. Picture: the patent's drawing.
Ilọsíwájú
3 days
Ìlànà
1
1
Charge the tower with polystyrene
Charge the tower with polystyrene
Charge a high-pressure tower with 300 lb of granular polystyrene.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Pólístáírín300 lbsÀwọn irinṣẹ́ tí a nílò:
Ìkòkò ìṣesí ìfúnpá
Òǹwọ̀n ìdọ́gba
Ìbọ̀wọ́ rọ́bà2
2
Add the propylene fraction
Add the propylene fraction
Add 100 lb of a cracked-oil gas fraction that is about 93 % propylene, under pressure, and close the tower. Propylene is a flammable gas: no flames, strong ventilation.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Propylene100 lbsÀwọn irinṣẹ́ tí a nílò:
Àgbá gáàsì tí a fi ìfúnpá kúnÌkòkò ìṣesí ìfúnpá
Gílásì Ààbò Fún Ìfọ́n Kẹ́míkà3
3
Stand two days at 40 °C
Stand two days at 40 °C
Let the tower stand for two days at 40 °C while the polystyrene takes up the propylene.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò ìṣesí ìfúnpá
Ẹ̀rọ Ìwọ̀n Ooru Yàrá Ìwádìí4
4
Let it out at 40 °C
Let it out at 40 °C
Open the valved outlet near the bottom (3.25 inch in the patent) at 40 °C. The pressure is about 200 psi. The gel flows out and swells into a log 8 inches across, 7.7 lb per cubic foot, with coarse but uniform cells. Close the outlet again.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò ìṣesí ìfúnpáẸ̀rọ Ìwọ̀n Ooru Yàrá ÌwádìíGílásì Ààbò Fún Ìfọ́n Kẹ́míkàÌbọ̀wọ́ rọ́bà5
5
Saw into boards
Saw into boards
When the foam has set, saw it lengthwise into slabs (ours: a woodworking saw).
Àwọn irinṣẹ́ tí a nílò:
Ayùn gbẹ́nàgbẹ́nàÌbọ̀wọ́ rọ́bàÌtọ́nisọ́nà yìí ń ṣe
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