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Extruded Polystyrene Foam: Propylene-Blown Log Let Out at 50 °C (McIntire, Dow 1948, Ex. 3, Test 2)
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 50 °C (250 psi in the tower), it swelled into a log 6 to 9 inches across, weighing 4.8 lb per cubic foot, with somewhat smaller, uniform cells.
Source: O. R. McIntire (Dow), US 2,450,436 (1948), Example 3. Picture: the patent's drawing.
高级
3 days
说明
1
1
Charge the tower with polystyrene
Charge the tower with polystyrene
Charge a high-pressure tower with 300 lb of granular polystyrene.
此步骤所需材料：
聚苯乙烯300 磅所需工具：
压力反应器
等臂天平
橡胶手套2
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.
此步骤所需材料：
丙烯100 磅所需工具：
高压气瓶压力反应器
化学防溅护目镜3
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.
所需工具：
压力反应器
实验室温度计4
4
Let it out at 50 °C
Let it out at 50 °C
Open the valved outlet near the bottom (3.25 inch in the patent) at 50 °C. The pressure is about 250 psi. The gel flows out and swells into a log 6 to 9 inches across, 4.8 lb per cubic foot, with somewhat smaller, uniform cells. Close the outlet again. The patent heated step by step (50, 60, 75 °C) for several hours each, letting a portion out at each step.
所需工具：
压力反应器实验室温度计化学防溅护目镜橡胶手套5
5
Saw into boards
Saw into boards
When the foam has set, saw it lengthwise into slabs (ours: a woodworking saw).
所需工具：
木工锯橡胶手套
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