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Acrylic Pellets: Methyl Methacrylate Stirred into Beads in Gelatine Water at 75 °C (Crawford & McGrath, ICI, US 2,108,044)

أنشأه

Charlie

30. أكتوبر 2026

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.

متقدم

1 day

التعليمات

Dissolve 1 part benzoyl peroxide in 100 parts monomer

Dissolve 1 part by weight of benzoyl peroxide in 100 parts of methyl methacrylate.

المواد لهذه الخطوة:

ميثاكريلات الميثيل100 parts by weight

فوق أكسيد البنزويل1 part by weight

الأدوات المطلوبة:

ميزان ذو كفّتين

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).

الأدوات المطلوبة:

مسحوق جيلاتين

ماء

مفاعل بلمرة مزدوج الجدار

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.

الأدوات المطلوبة:

محرّك تقليب

مرجل بخاري

ميزان حرارة مختبري

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.

الأدوات المطلوبة:

ماء

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.

الأدوات المطلوبة: