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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.
Ilọsíwájú
About 8 hours
Ìlànà
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Lactide10 partsÀwọn irinṣẹ́ tí a nílò:
Oxide òjé (litharge)
Òǹwọ̀n ìdọ́gba
Ìkòkò ìṣesí ìfúnpá
Ẹ̀rọ Ìmí P1002
2
Evacuate and close
Evacuate and close
Pump the air out of the vessel and close it.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìfàfẹ́fẹ́jáde
Ẹ̀rọ ìwọ̀n àìsí afẹ́fẹ́Ìkòkò ìṣesí ìfúnpá3
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).
Àwọn irinṣẹ́ tí a nílò:
Ààrò ìgbẹ̀
Ẹ̀rọ Ìwọ̀n Ooru Yàrá ÌwádìíÌkòkò ìṣesí ìfúnpá4
4
Extrude and pelletise
Extrude and pelletise
Ours: take the polymer out, melt it through an extruder and cut the cooled strand into pellets.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìtújáde ṣíṣu
Ẹ̀rọ Ìṣe Pẹ́lẹ́ẹ̀tì
Ìbọ̀wọ́ Tí Ń Fara Da OoruÀwọn irinṣẹ́ tó nílò
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