SEALING MEDIUM USING PTFE POROUS MATERIAL

PROBLEM TO BE SOLVED: To provide a sealing medium which can obtain sufficient hardness, flexibility, and elasticity for use by a technique capable of obtaining a PTFE porous material having a fine texture, a smooth surface and good dimensional accuracy and easily controlling the porosity of the PTFE...

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Bibliographische Detailangaben
Hauptverfasser:	YASUKAWA YOSHIKAZU, IWASAKI TOYOTA
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G BLASTING CHEMISTRY COMPOSITIONS BASED THEREON CYLINDERS DYES ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS GENERAL PROCESSES OF COMPOUNDING HEATING LIGHTING MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE MECHANICAL ENGINEERING METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PISTONS POLISHES SEALINGS THEIR PREPARATION OR CHEMICAL WORKING-UP THERMAL INSULATION IN GENERAL WEAPONS WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a sealing medium which can obtain sufficient hardness, flexibility, and elasticity for use by a technique capable of obtaining a PTFE porous material having a fine texture, a smooth surface and good dimensional accuracy and easily controlling the porosity of the PTFE material. SOLUTION: The sealing medium uses a nonstretched PTFE porous material having a porosity of not less than 5% and only an endothermic peak in a fired state (perfect firing) in the crystal fusion curve by the differential scanning calorimetry (DSC) or the endothermic peak in a fired state (perfect firing) to the extent of not becoming clear. The sealing medium has a shape of pores oriented in a specific direction. The sealing medium uses a PTFE porous material obtained by mixing a PTFE powder with a pore-forming agent containing a dicarboxylic acid powder and an organic solvent to form a PTFE mixture, molding the PTFE mixture into a predetermined shape, and removing the pore-forming agent to provide pores. COPYRIGHT: (C)2009,JPO&INPIT