Ubufatanye
UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Acrylic Polymer Medium: Methyl Methacrylate Emulsified by Persulfate Alone
Acrylic polymer medium is an emulsion of acrylic polymer in water, the binder of acrylic paint. ICI's Renfrew and Gates (US 2,296,403, 1942) found that a persulfate alone both keeps the monomer dispersed and starts it polymerising, so no soap is needed. Their Example 2 stirs 30 parts methyl methacrylate and 20 parts dibutyl phthalate (a plasticiser) hard in 100 parts water with 1 part persulfate at about 80 °C; the batch heats itself to 90-95 °C and gives a very stable emulsion. Using it as paint medium is our choice.
The picture: our diagram.
Hagati
Half a day
Amabwiriza
1
1
Weigh the charge
Weigh the charge
Weigh 30 parts methyl methacrylate, 20 parts dibutyl phthalate, 100 parts water and 1 part persulfate (ours: potassium persulfate; the example used lithium persulfate, and the patent names potassium among the alternatives).
Ibikoresho by'iyi ntambwe:
Metili Metakirilate30 parts
Dibutili Fatalate20 parts
Amazi100 parts
Igitangiza cya persulfate1 partIbikoresho bikenewe:
Umunzani w'ibiro
Amadarubindi yo Kwirinda Ibinyabutabire
Uturindantoki tw'ikawusu2
2
Stir hard at about 80 °C
Stir hard at about 80 °C
Put everything in a flask with a reflux condenser and stir very vigorously at about 80 °C, where it refluxes gently.
Ibikoresho bikenewe:
Icupa rifite igituza kizengurutse
Konderisateri isubiza
Igikoresho cyo kuvanga
Ubwogero bw'Amazi
Urubaho rushyushya
Igipima Ubushyuhe cy'Ubushakashatsi
Akabati k'umwotsi (gafite umuyoboro)3
3
Let it heat itself
Let it heat itself
After about half an hour the polymerisation starts giving off heat and the temperature climbs to 90-95 °C on its own. Keep stirring.
Ibikoresho bikenewe:
Igikoresho cyo kuvangaIgipima Ubushyuhe cy'Ubushakashatsi4
4
Cool
Cool
When the temperature starts to fall, the polymerisation is complete. Stop stirring and let it cool. The result is a very stable emulsion.
Ibikoresho bikenewe:
Igipima Ubushyuhe cy'UbushakashatsiIbikoresho
4- 30 partsUmwanya
- 20 partsUmwanya
- 100 partsUmwanya
- Umwanya
Ibikoresho bikenewe
10- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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