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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.
Abantado
A day
Mga Tagubilin
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.
Mga materyales para sa hakbang na ito:
Asin ng naylon525 g
Adipic acid2.9 gMga kailangang kasangkapan:
Reactor na may presyon
Ikid ng kondensador
Digital na Timbangang Pangkusina2
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.
Mga kailangang kasangkapan:
Bombang panghigop ng hangin
Nitroheno
Panukat ng Diin3
3
Heat to 288 °C
Heat to 288 °C
Start the stirrer and heat to 288 °C over 1.5 hours.
Mga kailangang kasangkapan:
Reactor na may presyon
Thermocouple na may basahan4
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.
Mga kailangang kasangkapan:
Reactor na may presyonBombang panghigop ng hanginPanukat ng DiinThermocouple na may basahan5
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.
Mga kailangang kasangkapan:
Reactor na may presyon6
6
Pelletise
Pelletise
Break up the cake (our step), melt it in the extruder, draw the strand and cut it into pellets.
Mga kailangang kasangkapan:
Extruder ng plastik
Die ng extrusion7
7
Grams and pressures
Grams and pressures
Naglo-load ng Jupyter notebook…
Mga Materyales
2- 525 gPlaceholder
- 2.9 gPlaceholder
Mga Kinakailangang Kasangkapan
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