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Acrylic Pellets: Methyl Methacrylate Stirred into Beads in Gelatine Water at 75 °C (Crawford & McGrath, ICI, US 2,108,044)
Stirred hard enough in water with a little gelatine, methyl methacrylate breaks into droplets that harden into separate beads of acrylic instead of one solid lump. ICI's beads settle out, wash easily and go straight to the moulding press.
Result: hard acrylic granules, used as moulding and extrusion pellets (they are beads, not cut pellets).
Source: Crawford & McGrath, US 2,108,044 (ICI, 1938), Examples 5 and 6. Picture drawn by Youblob.
Ilọsíwájú
1 day
Ìlànà
1
1
Dissolve 1 part benzoyl peroxide in 100 parts monomer
Dissolve 1 part benzoyl peroxide in 100 parts monomer
Dissolve 1 part by weight of benzoyl peroxide in 100 parts of methyl methacrylate.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Methyl Methacrylate100 parts by weight
Benzoyl peroxide1 part by weightÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba2
2
Mix with 200 parts of water holding 2 parts gelatine
Mix with 200 parts of water holding 2 parts gelatine
Mix it with 200 parts of water containing 2 parts of gelatine in solution (Example 6; Example 5 uses a soluble starch instead).
Àwọn irinṣẹ́ tí a nílò:
Ìyẹ̀fun gelatin
Omi
Ìkòkò ìṣe polymer oníbora3
3
Stir at 1000 rpm and blow in steam to 75 °C
Stir at 1000 rpm and blow in steam to 75 °C
Stir at 1000 rpm and blow steam into the stirred mixture to bring it to 75 °C, and hold it there. After about 115 minutes the temperature starts to rise by itself: shut off the steam.
Àwọn irinṣẹ́ tí a nílò:
Ohun ìrúwé
Bọ́ìlà èéfín omi
Ẹ̀rọ Ìwọ̀n Ooru Yàrá Ìwádìí4
4
At the 82 °C peak, cool to 60 °C with cold water
At the 82 °C peak, cool to 60 °C with cold water
When the temperature peaks at 82 °C, cool the mixture to 60 °C by adding cold water.
Àwọn irinṣẹ́ tí a nílò:
Omi5
5
Centrifuge, wash and dry at 100 °C
Centrifuge, wash and dry at 100 °C
Separate the granules in a centrifuge and wash them with 1 % hydrochloric acid, water, 2 % ammonia solution, and repeatedly with water. Dry them at 100 °C.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ yíyí agbọ̀n
Hydrochloric acid
Omi amonia - fífẹ́lẹ̀
Ààrò ìgbẹ̀Àwọn ohun-èlò
2- 100 parts by weightÀyè
- 1 part by weightÀyè
Àwọn irinṣẹ́ tó nílò
11- Àyè
- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
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