ʻO Polytetrafluoroethylene kahi fluoropolymer synthetic o ka tetrafluoroethylene he nui nā noi.ʻO ka inoa inoa inoa maikaʻi loa o nā kumu hoʻohālikelike PTFE he polymer na Chemours.Ka helu heheʻe: 620.3°F (326.8°C); Kumu: (C2F4)n; Māmā: 2.2 g/cm³; IUPAC ID: poly(1,1,2,2-tetrafluoroethylene).
Hoʻokumu ʻia ka PTFE e ka mīkini polymerization free-radical i loko o kahi pāpaʻi wai ma o ka polymerization hoʻohui o TFE i kahi kaʻina hana.ʻO ka mea hoʻomaka no ka polymerization ka mea maʻamau i ka wai-soluble peroxide e like me ka ammonium persulfate a i ʻole disuccinic peroxide.Hoʻohana ʻia kahi catalyst redox no ka polymerization wela haʻahaʻa.Hoʻokumu ʻia ka PTFE ma o ka hoʻokuʻu ʻana (a i ʻole slurry) polymerization me ka ʻole o ka surfactant e loaʻa i nā resins granular a i ʻole me kahi surfactant perfluorinated (emulsion polymerization) e like me ka ammonium perfluorooctanoate e hana i ka pauka maikaʻi a me nā huahana dispersion.ʻO ka mahana polymerization a me ke kaomi maʻamau mai 0 a 100 C a me 0.7 a 3.5 MPa.
Hoʻokumu ʻia ʻo Granular PTFE e ka polymerizing TFE wale nō a i ʻole ma ka hoʻohana ʻana i nā helu o nā comonomers.Hiki ke loaʻa i kahi mea hoʻomaka peroxide, surfactant liʻiliʻi a ʻaʻole ʻole, a me nā mea hoʻohui ʻē aʻe i loko o ke ʻano polymerization wai i hoʻoulu ʻia me ka ikaika a i kekahi manawa pale ʻia e kahi solution alkaline.Hoʻokumu ʻia ka hapa nui o ka polymer ma ke ʻano kinoea ma ke ʻano o nā ʻāpana kaula a me nā ʻano like ʻole.Hoʻopili ʻia nā ʻāpana i nā nui like ʻole, ma muli o nā waiwai pauka i koi ʻia e ke kaʻina hana.No ka laʻana, pono i ka ʻāpana ʻili liʻiliʻi ka liʻiliʻi ʻoiai e hoʻomaikaʻi ʻia ke kahe maikaʻi e ka nui o nā ʻāpana nui.
Hoʻokumu ʻia ka PTFE pauka maikaʻi e ka polymerization o TFE i kahi ʻano wai i mua o kahi mea hoʻomaka a me ka surfactant.ʻAʻole hahai ka polymerization i kahi mīkini emulsion maʻamau akā kekahi o nā loina, pili.ʻO ke kūpaʻa o ka hoʻopuehu i ka wā o ka polymerization, e pale i ka coagulation premature, ua kaulike ʻia me ka pono e wāwahi i ka emulsion e hoʻihoʻi i ka PTFE.Mālama ʻia ka haʻahaʻa haʻahaʻa haʻahaʻa i ka wā o ka polymerization me ka hoʻohana ʻana i nā pae surfactant ma lalo o ka ʻike micelle koʻikoʻi.Hoʻopili ʻia ka nui o ka polymerization a me ke ʻano o ka ʻāpana a me ka nui e ka neʻe ʻana o ka surfactant.Hoʻokumu ʻia ka hapa nui o nā ʻāpana i ka hapa mua o ka polymerization a ulu aʻe i ka wā e hele ai ka pōʻai.Hiki ke ho'omalu 'ia ke kaumaha o ka molekula a me ka haku mele 'ana me ka ho'ohana 'ana i nā mea a me nā kūlana polymerization.
Ka like polymerization kaʻina hana aqueous dispersions o PTFE like me ka pauka maikai.Hoʻopili ʻia ka hoʻopuehu ʻia a hoʻopaʻa ʻia me ka hoʻohana ʻana i nā ʻano mea hoʻoheheʻe ionic a me nā nonionic.Ua hōʻike ʻia kekahi mau ʻano hana e pili ana i ka electrodecantation, evaporation, a me ka wela wela.Hiki i nā mea hoʻohui kemika e hoʻohālikelike iā lākou me ke kaʻina hana a i ʻole nā koi waiwai ʻāpana ke hoʻololi i ka hoʻopuehu PTFE hope loa.
Hoʻokumu ʻia nā pūhui piha mai nā ʻano ʻekolu o ka PTFE me ka hoʻohana ʻana i nā mea hoʻopihapiha e like me ke aniani fiber, graphite, metala pauka, carbon fiber, a me nā mea ʻē aʻe.
Ka manawa hoʻouna: Sep-24-2018