艺术
美容与健康
工艺
文化与历史
娱乐
环境
食品与饮料
逆向工程
科学
体育
技术
可穿戴设备
Aqueous PTFE Dispersion: Tetrafluoroethylene Polymerised in Soapy Water (Berry 1951)
Ordinary soaps stop tetrafluoroethylene from growing into long chains. A fluorine soap does not: with 2 % of ammonium dodecafluoroheptanoate in the water, the gas polymerises into tiny PTFE ribbons that stay suspended. The result is a milky dispersion, a third of it polymer, the raw material for PTFE fine powder.
Source: K. L. Berry (du Pont), US 2,559,752 (1951), Example III. Making the ammonium salt from our acid, and the apparatus, are ours. Picture drawn by Youblob.
高级
1 day
说明
1
1
Make the ammonium salt
Make the ammonium salt
Ours: neutralise about 1.9 parts of dodecafluoroheptanoic acid with ammonia solution until just neutral to litmus, giving 2 parts of ammonium dodecafluoroheptanoate. Make it up with distilled water to 93 parts of water in all. Parts are by weight.
此步骤所需材料：
十二氟庚酸1.9 parts
氨水 25-28 %1 as required to neutralise
蒸馏水93 parts所需工具：
石蕊试纸
玻璃器皿
等臂天平2
2
Load the pressure vessel
Load the pressure vessel
Put the solution in a pressure vessel with 0.05 part of potassium persulfate and 5 parts of paraffin wax melting at 56–58 °C. The wax protects the colloid while it is stirred.
所需工具：
过硫酸盐引发剂
石蜡
压力反应器等臂天平3
3
Heat and remove the air
Heat and remove the air
Bring it to 80–85 °C, then evacuate the vessel and hold it under reduced pressure for several minutes to drive out air and dissolved oxygen.
所需工具：
压力反应器
真空泵
温度计4
4
Feed tetrafluoroethylene for 3.6 hours
Feed tetrafluoroethylene for 3.6 hours
Let in tetrafluoroethylene to 60 lb/sq in gauge. Agitate at 80–85 °C for 3.6 hours; each time the pressure falls to 55 lb/sq in, bring it back to 60.
此步骤所需材料：
四氟乙烯1 as required to hold 55–60 psi所需工具：
压力反应器
高压气瓶
压力表温度计5
5
Cool and lift off the wax
Cool and lift off the wax
Cool it. The paraffin sets on top and lifts off. Below it is a colloidal PTFE dispersion with 34 % solids.
所需工具：
压力反应器
带盖玻璃罐材料
4- 1.9 parts占位符
- 1 as required to neutralise占位符
- 93 parts占位符
- 1 as required to hold 55–60 psi占位符
此蓝图制作
相关蓝图
这些蓝图共享知识——技术、材料或原理
危险
Dodecafluoroheptanoic Acid: the Fluoro Alcohol Oxidised with Permanganate (Berry 1951)
Charlie 创作
工业
3
0
0
0
0
0
危险
Tetrafluoroethylene: Chlorodifluoromethane Pyrolysed in a Silver Tube at 700 °C
Charlie 创作
工业
9
0
0
0
0
0
PTFE Resin Powder: Tetrafluoroethylene Polymerised under Pressure, Plunkett 1941
Charlie 创作
工业
5
0
0
0
0
0
CC0 公共领域
此蓝图以 CC0 协议发布。你可以自由复制、修改、分发和使用此作品，无需征得许可。
通过购买蓝图中的产品支持创客，他们将获得 创客佣金 （由供应商设定），或创建此蓝图的新版本并将其作为连接包含在你自己的蓝图中以分享收入。