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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.
中级
Half a day
说明
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).
此步骤所需材料：
甲基丙烯酸甲酯30 parts
邻苯二甲酸二丁酯20 parts
水100 parts
过硫酸盐引发剂1 part所需工具：
等臂天平
化学防溅护目镜
橡胶手套2
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.
所需工具：
圆底烧瓶
回流冷凝管
搅拌器
水浴
电热板
实验室温度计
通风柜（带排风管）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.
所需工具：
搅拌器实验室温度计4
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.
所需工具：
实验室温度计此蓝图制作
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