PTFE Chemical Inertness

Kutentha pamwamba pa 77 ° C sibwino kwa zigawo zambiri za elastomers ndi mapulasitiki, pamene PTFE imapirira kutentha kwambiri mpaka 260 ° C.Ngakhale pansi pa 77 ° C, ngati ma asidi owononga zitsulo ndi zosungunulira za organic aphatikizidwa, liners ndi zigawo zikuluzikulu za PTFE nthawi zambiri amakonda chifukwa elastomers ndi mapulasitiki ena nthawi zambiri alibe kukana zosungunulira kutupa ndi kufewetsa.

Ndi inertness Chemical, tikutanthauza zimenezoPTFEUtoto wa fluorocarbon ukhoza kukhudzana mosalekeza ndi chinthu china popanda kuzindikirika komwe kumachitika.Nthawi zambiri, PTFE fluorocarbon resins ndi mankhwala inert.Komabe, mawu awa, monga ma generalizations onse, ayenera kukhala oyenerera ngati akuyenera kukhala olondola.Chiyeneretso sichidzabweretsa chisokonezo, komabe, ngati munthu amakumbukira mfundo zazikulu za khalidwe la PTFE resins.

Mafotokozedwe anthawi zonse a mayeso osiyanasiyana amatha kusokeretsa, chifukwa amatha kuphatikizira mitundu yosiyanasiyana ya machitidwe a "Chemical".Ngati kufotokozerako kukhale komveka bwino, kuyenera kusiyanitsa pakati pa zochitika za mankhwala ndi zochitika zakuthupi monga kuyamwa.Kufotokozera kuyenera kupangitsa kuti wogwiritsa ntchitoyo aganizire za kugwirizana kwa thupi ndi mankhwala zomwe zingakhudze ntchito inayake.

Mwachitsanzo, PTFE resins adzakhala osakhudzidwa ndi kumizidwa mu aqua regia.Koma ngati kutentha ndi chifukwa cha kuthamanga kwa reagent izi kukhala mkulu, mayamwidwe zigawo zikuluzikulu za reagent mu utomoni nawonso kuwonjezeka.Kusinthasintha kotsatira, monga kutsika kwadzidzidzi kwa kuthamanga, kumatha kuwononga thupi chifukwa chakukula kwa nthunzi yomwe imalowetsedwa mu utomoni.Mwachionekere, ndiye, pamene tikukamba za mankhwala katundu wa PTFE tiyenera kusiyanitsa mosamalitsa zimachitikira mankhwala, monga ife anasonyeza mwa mawu a "Chemical ngakhale" ndi zochita za thupi, monga "mayamwidwe" pamodzi ndi makina ndi matenthedwe nkhawa.

M'nyengo yotentha yomwe imagwiritsidwa ntchito, PTFE resins imakhudzidwa ndi mankhwala ochepa kwambiri m'malo molemba mankhwala omwe amagwirizana nawo.Ma reactants awa ali m'gulu lazinthu zachiwawa komanso zochepetsera zomwe zimadziwika.Elemental sodium polumikizana kwambiri ndi fluorocarbons amachotsa fluorine mu molekyulu ya polima.Izi zimagwiritsidwa ntchito kwambiri mu njira zopanda madzi zopangira PTFE kuti ma resins azikhala omata.Zitsulo zina za alkali (potaziyamu, lithiamu, ndi zina zotero) zimagwiranso ntchito mofananamo.

Wapamtima zikulumikizana finely anagawa zitsulo ufa (mwachitsanzo, zotayidwa kapena magnesium) ndi ufa utomoni fluorocarbon akhoza kuchita zachiwawa pamene anayatsa, koma poyatsira kutentha ndi patali kuposa lofalitsidwa analimbikitsa pazipita ntchito kutentha kwa PTFE utomoni.Ma oxidizer amphamvu kwambiri, fluorine (F2) ndi mankhwala ogwirizana nawo (mwachitsanzo, chlorine trifluoride, CIF3), amatha kuthandizidwa ndi PTFE kokha mosamala kwambiri komanso kuzindikira zoopsa zomwe zingachitike.Fluorine imalowetsedwa mu utomoni, ndipo ndi kukhudzana kwambiri koteroko kusakaniza kumakhala tcheru ku gwero la kuyatsa monga kukhudzidwa.

Nthawi zina kapena pafupi ndi kutentha kwapakati pa 260 ° C kwa TFE & PFA, ndi 204 ° C kwa FEP, mankhwala ochepa omwe ali ochuluka kwambiri adanenedwa kuti akugwira ntchito ku PTFE.Kuukira kofanana ndi sodium etch kwapangidwa pa kutentha kwakukulu kotere ndi 80% NaOH kapena KOH, ma hydrides achitsulo monga boranes (mwachitsanzo, B2H6), aluminium chloride, ammonia (NH3), ndi ma amines (R-NH2) ndi imines ( R = NH).Komanso, kuukira kwapang'onopang'ono kwa okosijeni kwawonedwa ndi 70% nitric acid pansi pa 250 ° C.Kuyezetsa kwapadera kumafunika pamene zovuta zochepetsera kapena zowononga oxidizing zikuyandikira.

Chifukwa chake, kupatula monga taonera, PTFE resins amawonetsa mitundu ingapo yamankhwala ndi matenthedwe.Koma wogula kapena wofotokozera zigawo za PTFE ayeneranso kudziwa ndikumvetsetsa zoperewera zake pokhudzana ndi chilengedwe chamankhwala.Mosiyana ndi kuchepa kwa zitsulo, izi nthawi zambiri sizimagula mankhwala mwachilengedwe.Zotsatira za kutentha, kupanikizika, ndi kuyamwa kwa mankhwala mu PTFE, ndi kuyanjana kwawo, ndizomwe m'kupita kwa nthawi zimalepheretsa zinthu zomwe PTFE idzachita mokwanira.Popeza kuti zimenezi n’zosiyana ndi pafupifupi zipangizo zina zilizonse zomangidwira, pamafunika kuganizira mozama mafotokozedwe atsatanetsatane amene amatsatira.