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Polyvinyl Alcohol: Polyvinyl Acetate Stirred in Alcoholic Potash
Vinyl alcohol itself cannot be isolated, but its polymer can: Herrmann and Haehnel (patent 1928) stirred ground polyvinyl acetate into potash dissolved in alcohol, and polyvinyl alcohol fell out as a white, odourless powder that dissolves in water. It is the protective colloid in PVA (polyvinyl acetate) glue emulsions.
The picture: our diagram of the patent's Example I.
中级
An hour, then drying
说明
1
1
Grind the polyvinyl acetate
Grind the polyvinyl acetate
Grind the solid polyvinyl acetate to a powder in a mortar (our method).
此步骤所需材料：
聚乙酸乙烯酯80 克所需工具：
研钵与研杵
数字厨房秤2
2
Dissolve the potash
Dissolve the potash
Dissolve 60 g potassium hydroxide in 50 g ethyl alcohol in a vessel you can stir. Potash burns skin and eyes.
此步骤所需材料：
氢氧化钾60 克
乙醇——实验级，95 %50 克所需工具：
玻璃烧杯
玻璃搅拌棒数字厨房秤
耐化学品手套
化学防溅护目镜3
3
Stir in the acetate
Stir in the acetate
Add the 80 g ground polyvinyl acetate while stirring hard, and keep stirring for about half an hour. Polyvinyl alcohol precipitates.
所需工具：
玻璃烧杯玻璃搅拌棒耐化学品手套化学防溅护目镜4
4
Filter and dry
Filter and dry
Collect the precipitate on a filter and dry it: a white powder without odour that dissolves in water.
所需工具：
布氏漏斗（瓷制）
滤纸
敞口晾晒盘耐化学品手套5
5
Scaling the patent's example
Scaling the patent's example
正在加载 Jupyter 笔记本…
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