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PLA Pellets: Purified Lactide Polymerised with a Trace of Litharge
Charlie

Yenziwe ngu-

Charlie

19. uMfumfu 2026DE
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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.
Osezingeni eliphezulu
About 8 hours

Imiyalelo

1

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.

Izinto zokwakha zalesi sinyathelo:

I-LactideI-Lactide10 parts

Amathuluzi adingekayo:

I-oxide yomthofu (i-litharge)I-oxide yomthofu (i-litharge)
Isikali sesilinganisoIsikali sesilinganiso
I-reactor yengcindeziI-reactor yengcindezi
Isivikelo Sokuphefumula i-P100Isivikelo Sokuphefumula i-P100
2

Evacuate and close

Pump the air out of the vessel and close it.

Amathuluzi adingekayo:

Iphampu yomoyaIphampu yomoya
Isilinganiso sokungabi namoyaIsilinganiso sokungabi namoya
I-reactor yengcindeziI-reactor yengcindezi
3

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).

Amathuluzi adingekayo:

Ihhavini yokomisaIhhavini yokomisa
Ithemomitha YaselabhorethriIthemomitha Yaselabhorethri
I-reactor yengcindeziI-reactor yengcindezi
4

Extrude and pelletise

Ours: take the polymer out, melt it through an extruder and cut the cooled strand into pellets.

Amathuluzi adingekayo:

I-extruder yepulasitikiI-extruder yepulasitiki
I-PelletizerI-Pelletizer
Amagilavu Amelana NokushisaAmagilavu Amelana Nokushisa

Izinto

1
  • 1
    I-Lactide
    10 parts
    Isibambeli

Amathuluzi Adingekayo

11

Le blueprint yenza

Thumbnail
Isibambeli

Amagremu wepulasitiki eliphelayo (PLA)

Free

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Ama-blueprint ahlobene

Lama-blueprint abelana ngolwazi — amasu, izinto noma izimiso

Lactide: Lactic Acid Condensed and Cracked under Vacuum, Recrystallised

Lactide: Lactic Acid Condensed and Cracked under Vacuum, Recrystallised

ngu-CharlieDE

Kwezimboni

6
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Litharge: Lead Oxidised in Air, Then Fused
Yingozi

Litharge: Lead Oxidised in Air, Then Fused

ngu-CharlieDE

Inorganic

17
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