METHOD OF PROCESSING POLYTETRAFLUOROETHYLENE WASTES

FIELD: chemistry. ^ SUBSTANCE: invention relates to processing polytetrafluoroethylene (PTFE) wastes to obtain dispersion powder for anticorrosion, heat-resistant and chemical-resistant coatings. The method involves thermal decomposition, sublimation of the decomposition products and condensation. P...

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Hauptverfasser:	BUZNIK VJACHESLAV MIKHAJLOVICH, KANTAEV ALEKSANDR SERGEEVICH, D'JACHENKO ALEKSANDR NIKOLAEVICH
Format:	Patent
Sprache:	eng ; rus
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS GENERAL PROCESSES OF COMPOUNDING GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS MAKING GRANULES OR PREFORMS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	FIELD: chemistry. ^ SUBSTANCE: invention relates to processing polytetrafluoroethylene (PTFE) wastes to obtain dispersion powder for anticorrosion, heat-resistant and chemical-resistant coatings. The method involves thermal decomposition, sublimation of the decomposition products and condensation. PTFE is first mixed with ammonium bifluoride (NH4HF2) in weight ratio ranging from 99:1 to 2.3:1. The mixture is held at 560-590C for 1-1.5 hours. While heating the mixture, the formed gas phase collected and condensed at 10-90C. ^ EFFECT: invention enables to obtain dispersion powder with high output and sufficient adhesion power. ^ 1 tbl, 6 ex Изобретение относится к переработке отходов политетрафторэтилена (ПТФЭ) с получением дисперсных порошков для создания антикоррозийных, термоустойчивых и химически стойких покрытий. Способ включает процесс термодеструкции, процесс сублимации продуктов разложения, процесс конденсации. ПТФЭ предварительно смешивают с гидродифторидом аммония (NH4HF2) в соотношении от 99:1 до 2,3:1 по массе. Смесь выдерживают при 560-590°С в течение от 1 до 1,5 часов. Образованную газовую фазу при нагревании смеси собирают и конденсируют при 10-90°С. Изобретение позволяет получать дисперсный порошок с выходом более 60% и достаточной адгезионной способностью. 1 табл.