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

Inactive Publication Date: 2008-12-17
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this publication does not describe the surface roughness Ra, tensile strength, tensile elongation, powder fluidity, etc. of the powder, and does not describe the pulverization method.

Method used

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  • PTFE powder and method of producing PTFE molding powders
  • PTFE powder and method of producing PTFE molding powders
  • PTFE powder and method of producing PTFE molding powders

Examples

Experimental program
Comparison scheme
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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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Abstract

This invention provides a polytetrafluoroethylene powder capable of giving moldings which are improved in surface roughness Ra, tensile strength and / or tensile elongation as compared with the prior art ones and can be excellent in dielectric breakdown strength and, further, can be excellent, if desired, in apparent density and / or powder flowability as well, and a method of producing a polytetrafluoroethylene molding powder. The present invention is a PTFE powder wherein a surface roughness Ra of molded articles a1 for measurement is less than 0.92 mu m.

Description

[0001] This application is a divisional application. The international application number of the original application is PCT / JP02 / 11035, the Chinese national application number is 02821101.4, and the application date is October 24, 2002. The invention name is "PTFE powder and PTFE molding powder. Manufacturing method". technical field [0002] The present invention relates to polytetrafluoroethylene powder and a method for producing polytetrafluoroethylene molding powder used for manufacturing polytetrafluoroethylene molding powder, which can improve the surface smoothness and tensile strength of moldings. And / or the tensile elongation is improved compared with the conventional one, and the dielectric breakdown strength is excellent, and the apparent density and / or powder fluidity may also be excellent if necessary. Background technique [0003] Polytetrafluoroethylene (PTFE) is a thermoplastic resin with excellent heat resistance, corrosion resistance, weather resistance, e...

Claims

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Application Information

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IPC IPC(8): C08J3/12C08L27/18
Inventor 辻雅之浅野道男助川胜通
Owner DAIKIN IND LTD
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