PTFE powder and method of producing PTFE molding powders
A manufacturing method and powder technology, which is applied in the field of manufacturing PTFE granulated powder and PTFE granulated powder, can solve problems such as unrecorded crushing methods, and achieve excellent dielectric breakdown voltage, excellent apparent density and/or powder fluidity, Effect with less unevenness
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manufacture example 1PT
[0428] Production Example 1 Production of PTFE Uncrushed Powder (I)
[0429] Add 1,600 liters of deoxygenated pure water to a stainless steel autoclave with an internal volume of 2,000 liters and a stirrer, exhaust the internal air with nitrogen, and exchange it with tetrafluoroethylene, then maintain the internal temperature at 30° C. Press tetrafluoroethylene until the internal pressure is 4 atmospheres, add polymerization initiator (NH 4 ) 2 S 2 o 8 , Polymerization of tetrafluoroethylene was carried out while stirring. The pressure decreased as the polymerization proceeded, so additional tetrafluoroethylene was continuously added to maintain the internal pressure at 4 atmospheres. After 5 hours, the reaction was terminated, unreacted tetrafluoroethylene was recovered, and the contents were taken out. With T.K. pipeline type high-speed mixer 2S type machine (trade name, Tokukuki Kagaku Kogyo Co., Ltd.), the raw powder of the PTFE-based polymer having an average parti...
manufacture example 2PT
[0430] Production example 2 Production of PTFE unmilled powder (III)
[0431] 3.3 g of ammonium carbonate was dissolved in 54.8 liters of pure water, and the resulting solution was added to a 170-liter autoclave, and stirred at 110 rpm with an anchor stirrer. After degassing, press tetrafluoroethylene until the gauge pressure is 0.5kgf / cm 2 G, this operation was repeated 3 times, and then perfluoro(propyl vinyl ether) was pressed into the reaction system with the help of tetrafluoroethylene, and after the temperature of the reaction system rose to 50°C, tetrafluoroethylene was pressed until the temperature of the reaction system The internal pressure is 8kgf / cm 2 g. Ammonium persulfate was added thereto to initiate polymerization. During polymerization, continuously press tetrafluoroethylene to maintain the internal pressure of the reaction system at 8kgf / cm 2 G, when the amount of tetrafluoroethylene consumed is 30% by weight of the weight of the aqueous medium, the rea...
manufacture example 3PT
[0432] Production example 3 Production of PTFE unmilled powder (II)
[0433] 3.3 g of ammonium carbonate was dissolved in 54.8 liters of pure water, and the resulting solution was added to a 170-liter autoclave, and stirred at 110 rpm with an anchor stirrer. After degassing, press tetrafluoroethylene until the gauge pressure is 0.5kgf / cm 2 G, this operation was repeated 3 times, and then perfluoro(propyl vinyl ether) was pressed into the reaction system with the help of tetrafluoroethylene, and after the temperature of the reaction system rose to 70°C, tetrafluoroethylene was pressed until the temperature of the reaction system The internal pressure is 8kgf / cm 2 g. Ammonium persulfate was added thereto to initiate polymerization. During polymerization, continuously press tetrafluoroethylene to maintain the internal pressure of the reaction system at 8kgf / cm 2 G, when the amount of tetrafluoroethylene consumed is 22.5% by weight of the weight of the aqueous medium, the re...
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