IṢẸ́ ỌNÀ
ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
Nylon 66 Pellets: Nylon Salt Polymerised in an Autoclave, Carothers 1938
Nylon salt heated to 288 °C under oxygen-free nitrogen gives off water and joins into long chains of nylon 66 (Carothers, du Pont, US 2,130,948, 1938: two moles of salt in a silver-lined autoclave). A pinch of extra adipic acid keeps the melt's viscosity steady. The polymer is then extruded and cut into pellets.
The picture: our drawing of the autoclave and the pellet line.
Ilọsíwájú
A day
Ìlànà
1
1
Charge the autoclave
Charge the autoclave
Put two moles of nylon salt (525 g) and 0.02 mole of adipic acid (2.9 g) in a two-litre silver-lined autoclave with a stainless stirrer and a reflux condenser leading to a receiver.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Iyọ̀ nylon525 g
Acid adipic2.9 gÀwọn irinṣẹ́ tí a nílò:
Ìkòkò ìṣesí ìfúnpá
Ìyípo ẹ̀rọ ìtutù
Òṣùwọ̀n Díjítà Ilé Ìdáná2
2
Drive out the air
Drive out the air
Evacuate, fill with nitrogen, evacuate again, then apply 80 lb/in² of nitrogen. Use nitrogen free of oxygen; oxygen spoils the polymer.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìfàfẹ́fẹ́jáde
Nitrogen
Ẹ̀rọ Ìwọ̀n Ìtẹ̀3
3
Heat to 288 °C
Heat to 288 °C
Start the stirrer and heat to 288 °C over 1.5 hours.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò ìṣesí ìfúnpá
Thermocouple pẹ̀lú ìkà4
4
Let the water off
Let the water off
Bring the pressure down to atmospheric over half an hour and keep heating and stirring 2.5 hours. Then pull to 200 mm absolute for a few minutes.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò ìṣesí ìfúnpáẸ̀rọ ìfàfẹ́fẹ́jádeẸ̀rọ Ìwọ̀n Ìtẹ̀Thermocouple pẹ̀lú ìkà5
5
Cool and take out
Cool and take out
Cool. The polymer comes out as a white solid cake that melts at about 263 °C.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò ìṣesí ìfúnpá6
6
Pelletise
Pelletise
Break up the cake (our step), melt it in the extruder, draw the strand and cut it into pellets.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìtújáde ṣíṣu
Ẹnu ìtújáde irin7
7
Grams and pressures
Grams and pressures
Ń ṣí ìwé Jupyter…
Àwọn ohun-èlò
2- 525 gÀyè
- 2.9 gÀyè
Àwọn irinṣẹ́ tó nílò
9- 1 vendor sell this, none ship to you yetÀyè
- Àyè
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