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

Imeundwa na

Charlie

19. Oktoba 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.
Juu
About 8 hours

Maagizo

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.

Vifaa kwa hatua hii:

LaktaidiLaktaidi10 parts

Zana zinazohitajika:

Oksidi ya risasi (litaji)Oksidi ya risasi (litaji)
Mizani ya mizani-mbiliMizani ya mizani-mbili
Riakta ya shinikizoRiakta ya shinikizo
Kinga ya Kupumua ya P100Kinga ya Kupumua ya P100
2

Evacuate and close

Pump the air out of the vessel and close it.

Zana zinazohitajika:

Pampu ya utupuPampu ya utupu
Kipima utupuKipima utupu
Riakta ya shinikizoRiakta ya shinikizo
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).

Zana zinazohitajika:

Tanuri la kukaushiaTanuri la kukaushia
Kipimajoto cha maabaraKipimajoto cha maabara
Riakta ya shinikizoRiakta ya shinikizo
4

Extrude and pelletise

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

Zana zinazohitajika:

Kitoaji cha plastikiKitoaji cha plastiki
Kitengeneza chembeKitengeneza chembe
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto

Vifaa

1
  • 1
    Laktaidi
    10 parts
    Kishikilia Nafasi

Zana Zinazohitajika

11

Mchoro huu unatengeneza

Thumbnail
Kishikilia nafasi

Vidonge vya plastiki inayoharibika (PLA)

Free

60
0

Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Lactide: Lactic Acid Condensed and Cracked under Vacuum, Recrystallised

Lactide: Lactic Acid Condensed and Cracked under Vacuum, Recrystallised

na CharlieDE

Viwandani

6
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Litharge: Lead Oxidised in Air, Then Fused
Hatari

Litharge: Lead Oxidised in Air, Then Fused

na CharlieDE

Isiyo hai

17
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CC0 Umma Wote

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