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Aqueous PTFE Dispersion: Tetrafluoroethylene Polymerised in Soapy Water (Berry 1951)
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Charlie

28. Oktober 2026DE
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Aqueous PTFE Dispersion: Tetrafluoroethylene Polymerised in Soapy Water (Berry 1951)

Ordinary soaps stop tetrafluoroethylene from growing into long chains. A fluorine soap does not: with 2 % of ammonium dodecafluoroheptanoate in the water, the gas polymerises into tiny PTFE ribbons that stay suspended. The result is a milky dispersion, a third of it polymer, the raw material for PTFE fine powder. Source: K. L. Berry (du Pont), US 2,559,752 (1951), Example III. Making the ammonium salt from our acid, and the apparatus, are ours. Picture drawn by Youblob.
Lanjutan
1 day

Arahan

1

Make the ammonium salt

Ours: neutralise about 1.9 parts of dodecafluoroheptanoic acid with ammonia solution until just neutral to litmus, giving 2 parts of ammonium dodecafluoroheptanoate. Make it up with distilled water to 93 parts of water in all. Parts are by weight.

Bahan untuk langkah ini:

Asid dodekafluoroheptanoikAsid dodekafluoroheptanoik1.9 parts
Larutan ammonia 25-28 %Larutan ammonia 25-28 %1 as required to neutralise
Air SulingAir Suling93 parts

Alatan diperlukan:

Kertas litmusKertas litmus
Bekas kacaBekas kaca
Neraca dua piringNeraca dua piring
2

Load the pressure vessel

Put the solution in a pressure vessel with 0.05 part of potassium persulfate and 5 parts of paraffin wax melting at 56–58 °C. The wax protects the colloid while it is stirred.

Alatan diperlukan:

Pemula persulfatPemula persulfat
Lilin parafinLilin parafin
Reaktor bertekananReaktor bertekanan
Neraca dua piringNeraca dua piring
3

Heat and remove the air

Bring it to 80–85 °C, then evacuate the vessel and hold it under reduced pressure for several minutes to drive out air and dissolved oxygen.

Alatan diperlukan:

Reaktor bertekananReaktor bertekanan
Pam vakumPam vakum
TermometerTermometer
4

Feed tetrafluoroethylene for 3.6 hours

Let in tetrafluoroethylene to 60 lb/sq in gauge. Agitate at 80–85 °C for 3.6 hours; each time the pressure falls to 55 lb/sq in, bring it back to 60.

Bahan untuk langkah ini:

TetrafluoroetilenaTetrafluoroetilena1 as required to hold 55–60 psi

Alatan diperlukan:

Reaktor bertekananReaktor bertekanan
Silinder gas bertekananSilinder gas bertekanan
Tolok TekananTolok Tekanan
TermometerTermometer
5

Cool and lift off the wax

Cool it. The paraffin sets on top and lifts off. Below it is a colloidal PTFE dispersion with 34 % solids.

Alatan diperlukan:

Reaktor bertekananReaktor bertekanan
Balang Kaca BertutupBalang Kaca Bertutup

Bahan

4

Alatan Diperlukan

11

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