UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
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UBWUBATSI BUSUBIRA INYUMA
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IBYAMBARWA
PLA Pellets: Purified Lactide Polymerised with a Trace of Litharge
PLA (polylactide) is the polymer of lactic acid, the stock for PLA filament. Schneider's du Pont patent (US 2,703,316, 1955) made a tough, clear polymer by heating very pure lactide with a trace of litharge in a closed, evacuated vessel: at 180 °C it was done in 6½ hours. Above 200 °C the polymer falls back to lactide. Extruding it and cutting the strand into pellets is our step.
The picture: our diagram.
Hejuru
About 8 hours
Amabwiriza
1
1
Charge lactide and litharge
Charge lactide and litharge
Weigh 10 parts of purified lactide (melting at 125 °C in the patent's example; it must melt at 120 °C or above) and 0.004 part litharge into the reaction vessel.
Ibikoresho by'iyi ntambwe:
Laktide10 partsIbikoresho bikenewe:
Oxyde y'isasu (litharge)
Umunzani w'ibiro
Reyakitori y'igitutu
Agapfukamunwa ka P1002
2
Evacuate and close
Evacuate and close
Pump the air out of the vessel and close it.
Ibikoresho bikenewe:
Pompe ikuramo umwuka
Igipima icyuho cy'umwukaReyakitori y'igitutu3
3
Heat 6½ hours at 180 °C
Heat 6½ hours at 180 °C
Heat at 180 °C for 6½ hours. Do not go above 200 °C, where the polymer turns back to lactide. The product is a clear, colourless polymer (the example's softened at about 82 °C).
Ibikoresho bikenewe:
Ifuru yo kumishaho
Igipima Ubushyuhe cy'UbushakashatsiReyakitori y'igitutu4
4
Extrude and pelletise
Extrude and pelletise
Ours: take the polymer out, melt it through an extruder and cut the cooled strand into pellets.
Ibikoresho bikenewe:
Imashini isohora pulasitiki
Imashini ikata utubuto
Uturindantoki twihanganira ubushyuheIbikoresho bikenewe
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