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Nylon 66 Pellets: Nylon Salt Polymerised in an Autoclave, Carothers 1938
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17. Ukwakira 2026FI
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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.
Hejuru
A day

Amabwiriza

1

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.

Ibikoresho by'iyi ntambwe:

Umunyu wa nayiloniUmunyu wa nayiloni525 g
Asidi ya adipikeAsidi ya adipike2.9 g

Ibikoresho bikenewe:

Reyakitori y'igitutuReyakitori y'igitutu
Umuzingo w'ikondanseriUmuzingo w'ikondanseri
Iminzani ya Digitale yo mu GikoniIminzani ya Digitale yo mu Gikoni
2

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.

Ibikoresho bikenewe:

Pompe ikuramo umwukaPompe ikuramo umwuka
AzoteAzote
Igipima UmuvudukoIgipima Umuvuduko
3

Heat to 288 °C

Start the stirrer and heat to 288 °C over 1.5 hours.

Ibikoresho bikenewe:

Reyakitori y'igitutuReyakitori y'igitutu
Termokupuli ifite igaragazaTermokupuli ifite igaragaza
4

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.

Ibikoresho bikenewe:

Reyakitori y'igitutuReyakitori y'igitutu
Pompe ikuramo umwukaPompe ikuramo umwuka
Igipima UmuvudukoIgipima Umuvuduko
Termokupuli ifite igaragazaTermokupuli ifite igaragaza
5

Cool and take out

Cool. The polymer comes out as a white solid cake that melts at about 263 °C.

Ibikoresho bikenewe:

Reyakitori y'igitutuReyakitori y'igitutu
6

Pelletise

Break up the cake (our step), melt it in the extruder, draw the strand and cut it into pellets.

Ibikoresho bikenewe:

Imashini isohora pulasitikiImashini isohora pulasitiki
Icyuma cyo gusohoramoIcyuma cyo gusohoramo
7

Grams and pressures

Gupakira ikaye ya Jupyter…

Ibikoresho

2

Ibikoresho bikenewe

9

Iki gishushanyo gikora

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Agateganyo

Utubuye twa nayiloni

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Blueprint zijyanye

Izi blueprint zisangira ubumenyi — uburyo, ibikoresho cyangwa amahame

Nylon Salt: Hexamethylenediamine and Adipic Acid Crystallized from Alcohol, Carothers 1938

Nylon Salt: Hexamethylenediamine and Adipic Acid Crystallized from Alcohol, Carothers 1938

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Polimeri

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Polypropylene Pellets by Bulk Polymerisation in Liquid Propylene

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CC0 Umurenge rusange

Iyi blueprint yasohowe munsi ya CC0. Ushobora gukoporora, guhindura, gukwirakwiza no gukoresha nta kwemererwa.

Shyigikira Umuremyi ugura ibicuruzwa binyuze muri Blueprint ye Komisiyo y'Umuremyi byashyizweho n'Abacuruzi, cyangwa kora verisiyo nshya y'iyi Blueprint ukayinjiza nk'isano muri Blueprint yawe kugira ngo musangire inyungu.

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