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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.
Osezingeni eliphezulu
1 day
Imiyalelo
1
1
Make the ammonium salt
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.
Izinto zokwakha zalesi sinyathelo:
I-asidi ye-dodecafluoroheptanoic1.9 parts
Isixazululo se-ammonia - 25-28 %1 as required to neutralise
Amanzi Acwengisisiwe93 partsAmathuluzi adingekayo:
Iphepha le-litmus
Isitsha sengilazi
Isikali sesilinganiso2
2
Load the pressure vessel
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.
Amathuluzi adingekayo:
I-initiator ye-persulfate
I-paraffin wax
I-reactor yengcindeziIsikali sesilinganiso3
3
Heat and remove the air
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.
Amathuluzi adingekayo:
I-reactor yengcindezi
Iphampu yomoya
Ithemomitha4
4
Feed tetrafluoroethylene for 3.6 hours
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.
Izinto zokwakha zalesi sinyathelo:
I-Tetrafluoroethylene1 as required to hold 55–60 psiAmathuluzi adingekayo:
I-reactor yengcindezi
Isilinda segesi ecindezelwe
Isilinganiso SengcindeziIthemomitha5
5
Cool and lift off the wax
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.
Amathuluzi adingekayo:
I-reactor yengcindezi
Ijeke Lengilazi ElinesivaloIzinto
4- 1.9 partsIsibambeli
- 1 as required to neutraliseIsibambeli
- 93 partsIsibambeli
- 1 as required to hold 55–60 psiIsibambeli
Amathuluzi Adingekayo
11- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- 1 vendor sell this, none ship to you yetIsibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
Le blueprint yenza
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Lama-blueprint abelana ngolwazi — amasu, izinto noma izimiso
Yingozi
Dodecafluoroheptanoic Acid: the Fluoro Alcohol Oxidised with Permanganate (Berry 1951)
ngu-Charlie
Kwezimboni
8
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0
0
0
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Yingozi
Tetrafluoroethylene: Chlorodifluoromethane Pyrolysed in a Silver Tube at 700 °C
ngu-Charlie
Kwezimboni
12
0
0
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PTFE Resin Powder: Tetrafluoroethylene Polymerised under Pressure, Plunkett 1941
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Kwezimboni
12
0
0
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