PTFE yog nto moo rau nws cov tshuaj inertness - feem ntau hu ua 'King of Plastics.' Nws resists yuav luag tag nrho cov acids, alkalis, thiab cov kuab tshuaj nyob rau hauv chav tsev kub. Txawm li cas los xij, 'yuav luag tag nrho' tsis yog 'tag nrho.' Nyob rau hauv huab cua txias - kub, siab concentration, los yog nyob rau hauv lub xeev molten - tej yam tshuaj tuaj yeem tua PTFE. Thiab txawm tias thaum PTFE nws tus kheej muaj sia nyob, lub hauv paus fiberglass substrate tej zaum yuav tsis yooj yim yog tias txheej txheej muaj qhov tsis xws luag.
Kev nkag siab txog cov kev txwv no yog qhov tseem ceeb rau kev xaiv PTFE npuag hauv ib puag ncig tshuaj lom neeg hnyav.
Aokai PTFE tau sim PTFE-coated fabrics tiv thaiv cov tshuaj phem. Phau ntawv qhia no piav qhia txog dab tsi corrodes PTFE ncaj qha, dab tsi tawm tsam cov fiberglass substrate, thiab yuav ua li cas kom tsis txhob poob.
Yuav ua li cas Corrosion tshwm sim - Ob tug Mechanisms
PTFE high-temperature npuag muaj ob ntu: PTFE txheej (nyias, tsis yog-stick, chemically inert) thiab fiberglass substrate (muab lub zog tab sis muaj kev cuam tshuam rau qee yam tshuaj). Corrosion tshwm sim nyob rau hauv ob txoj kev:
1. Direct yaig ntawm PTFE txheej
Qhov no tsuas yog tshwm sim nyob rau hauv huab cua txias - kub, siab concentration, los yog nyob rau hauv lub molten lub xeev. Nyob rau hauv chav tsev kub, PTFE yog zoo tiv thaiv kom txhob muaj tshuaj tua kab mob.
2. Corrosion ntawm fiberglass substrate los ntawm txheej txheej
Cov tshuaj nkag mus rau hauv pinholes, khawb, lossis micro-cracks hauv PTFE txheej thiab tua cov iav fibers. PTFE nws tus kheej tseem yuav zoo li zoo, tab sis cov ntaub poob txhua yam muaj zog thiab tuaj yeem tsim kua muag tau yooj yim. Qhov no yog hom kev ua tsis tiav thaum lub txheej puas lawm.
Cov tshuaj uas cuam tshuam ncaj qha PTFE txheej
Cov tshuaj no tshwm sim nrog PTFE nws tus kheej, tab sis tsuas yog nyob rau hauv huab cua txias.
Molten sodium (Na), potassium (K), thiab lithium (Li) strip fluorine atoms los ntawm PTFE, ua rau carbonization, dub discoloration, thiab hmoov ntawm cov khoom nto. Cov tshuaj sodium-naphthalene siv rau PTFE etching ua haujlwm ntawm txoj cai no.
Cov nyhuv: Ua tiav kev puas tsuaj ntawm PTFE qauv.
Cov xwm txheej: Txhua qhov raug rau cov hlau molten alkali (tshaj lawv cov ntsiab lus melting, piv txwv li, Na ntawm 98 ° C).
Kev pom zoo: Tsis txhob ua kom tiav. Siv cov yeeb yaj kiab PTFE ntshiab nkaus xwb yog tias tsim nyog, thiab txawm tias yuav tsum ceev faj.
2. Cov tshuaj fluorinating muaj zog ntawm qhov kub thiab txias
Cov tshuaj no tuaj yeem decompose PTFE nyob rau hauv qhov kub kub:
Fluorine gas (F₂): Ua rau maj mam corrosion ntawm qhov kub thiab txias.
Interhalogen fluorides: Cov tshuaj muaj zog heev xws li chlorine trifluoride (ClF₃) thiab bromine pentafluoride (BrF₅) tuaj yeem ua rau muaj kev cuam tshuam hnyav lossis txawm tias PTFE combustion ntawm qhov kub thiab txias.
Muaj zog oxidizing fluorides: Piv txwv li, xenon difluoride (XeF₂).
Kev pom zoo: Khaws PTFE ntaub kom deb ntawm cov tshuaj no, tshwj xeeb tshaj yog nyob rau qhov kub siab.
3. Molten muaj zog alkalis ntawm qhov kub thiab txias
Molten sodium hydroxide (NaOH) thiab potassium hydroxide (KOH) maj mam corrode PTFE nto saum 300 ° C, ua rau poob ntawm hydrophobicity thiab nto gloss. Hauv qab 300 ° C, PTFE tiv taus alkalis zoo. Nyob rau hauv chav tsev kub, tsis muaj kev cuam tshuam.
Magnesium hmoov (Mg), txhuas hmoov (Al), thiab cov ntaub ntawv zoo sib xws react hnyav nrog PTFE ntawm qhov kub thiab txias, ua cov hlau fluorides thiab carbon. Qhov no yog lub hauv paus rau qee cov pyrotechnic thiab incendiary compositions uas muaj PTFE.
Cov tshuaj uas cuam tshuam cov fiberglass substrate los ntawm txheej txheej
Cov tshuaj no tsis hnov mob nrog PTFE, tab sis yog tias PTFE txheej muaj qhov pinhole, khawb, lossis ntug raug, lawv yuav nkag mus thiab rhuav tshem cov fiberglass.
1. Hydrofluoric acid (HF) - qhov txaus ntshai tshaj plaws
Hydrofluoric acid yog kev puas tsuaj rau fiberglass. Nws reacts sai nrog silicon dioxide (lub ntsiab ntawm iav) los tsim silicon tetrafluoride gas, dissolving cov iav fibers.
PTFE nws tus kheej tiv thaiv HF zoo kawg nkaus - PTFE feem ntau siv rau HF tuav cov khoom.
Txawm li cas los xij, PTFE-coated npuag tsis muaj kev nyab xeeb rau HF tshwj tsis yog tias txheej txheej tsis muaj pinhole kiag li (uas yog qhov nyuaj heev los lav). Txhua qhov tsis xws luag yuav cia HF wick rau hauv fiberglass, ua rau cov ntaub tsis ua haujlwm sai.
Kev pom zoo: Rau HF kev pabcuam, siv cov yeeb yaj kiab PTFE ntshiab (tsis muaj fiberglass reinforcement) lossis ib lub hnab ntim tag nrho ntawm PTFE liner nrog rau qhov tseeb pes tsawg pinholes.
2. Concentrated alkalis ntawm qhov kub thiab txias
Cov tshuaj muaj zog sodium hydroxide (NaOH) ntawm qhov kub thiab txias tuaj yeem ua rau cov iav fiberglass los ntawm txheej txheej tsis zoo. Chav ntsuas kub, dilute alkalis muaj kev nyab xeeb.
3. Concentrated phosphoric acid ntawm qhov kub thiab txias
Kev sib cuag ntev nrog kub concentrated phosphoric acid yuav ua rau corrosion rau fiberglass. Ntxiv dua thiab, PTFE nws tus kheej tiv thaiv nws, tab sis txheej tsis xws luag yog qhov tsis muaj zog.
Cov Lus Ceeb Toom Tseem Ceeb rau Kev Pabcuam Tshuaj
1. Feem ntau qhov ua tsis tiav yog los ntawm kev siv tshuab lossis thermal aging, tsis yog tshuaj tua kab mob
Hauv cov ntawv thov kev lag luam (tshwj xeeb cov nroj tsuag, kev ua zaub mov, thiab lwm yam), PTFE npuag tsis ua haujlwm vim kev puas tsuaj, tawg, lossis cua sov degradation ntev ua ntej cov tshuaj corrosion ua qhov teeb meem. Cov tshuaj inertness ntawm PTFE yog qhov tseeb thiab txhim khu kev qha rau yuav luag txhua yam tshuaj mus txog 260 ° C.
2. Yog tias koj yuav tsum tau ua cov tshuaj nruj nruj, siv cov yeeb yaj kiab PTFE ntshiab
Rau cov ntawv thov uas muaj molten alkali hlau, kub concentrated HF, los yog muaj zog fluorinating agents, PTFE-coated fiberglass tsis pom zoo . Hloov chaw, siv:
3. Ib txwm sim ua ntej siv tag nrho
Yog tias koj daim ntawv thov cuam tshuam nrog cov tshuaj tsis tau teev tseg raws li 'kev nyab xeeb' nyob rau hauv cov qauv kev sib raug zoo, ua cov khoom siv sib xws hauv cov kev ua haujlwm tiag tiag (kub, concentration, sijhawm). Aokai PTFE tuaj yeem muab cov qauv kuaj rau kev siv tau.
Summary – Chemical Compatibility Quick Reference
Tshuaj
Cov nyhuv ntawm PTFE txheej
Cov nyhuv ntawm Fiberglass (yog tias raug)
Kev nyab xeeb rau PTFE Npuag?
Feem ntau cov acids (H₂SO₄, HCl, HNO₃, thiab lwm yam)
Tsis muaj
Tsis muaj
✅ Tau (txog 260 ° C)
Feem ntau alkalis (NaOH, KOH - dilute, chav temp)
Tsis muaj
Tsis muaj
✅ Yog
Concentrated NaOH / KOH> 300 ° C (molten)
Maj mam corrosion
Tawm tsam los ntawm qhov tsis xws luag
⚠️ Tsis yog (siv PTFE ntshiab)
Hydrofluoric acid (HF)
Tsis muaj (zoo tiv taus)
Kev tawg sai sai
❌ Tsis yog (tshwj tsis yog txheej zoo meej)
Cov kuab tshuaj organic (acetone, toluene, cawv)
Tsis muaj
Tsis muaj
✅ Yog
Molten alkali hlau (Na, K)
Kev puas tsuaj tag
N/A
❌ Tsis yog (siv PTFE ntshiab)
Fluorine gas (F₂) thaum kub kub
Decomposes
N/A
❌ Tsis muaj
Kub concentrated phosphoric acid
Tsis muaj
Erodes maj mam
⚠️ Ceev faj (tsis txhob muaj qhov tsis xws luag)
Aokai PTFE muab tshuaj lom neeg cov kev taw qhia thiab tuaj yeem pom zoo cov khoom tsim nyog - PTFE-coated ntaub rau feem ntau daim ntaub ntawv, los yog ntshiab PTFE zaj duab xis rau huab cua kev pab cuam. Tiv tauj peb nrog koj cov tshuaj, qhov kub thiab txias, thiab lub sij hawm raug.
Cov ntsiab lus saum toj no yog muab los ntawm Jiangsu Aokai Tshiab Materials Technology Co., Ltd.
Yog tias koj xav paub ntau ntxiv txog cov ncauj lus kom ntxaws, daim ntawv thov scenarios thiab cov kev daws teeb meem rau peb cov khoom lag luam tag nrho, suav nrog PTFE high-temperature fabrics, PTFE high-temperature tapes, PTFE mesh bets, seamless bonding machine bets, single-sided PTFE fabric, high-temperature resistant conveyor bets thiab high-temperature fabrics, thov hu rau peb:
Peb ib txwm txhawb nqa lub tswv yim ntawm kev tshaj lij thiab kev ncaj ncees, thiab tau cog lus los muab kev daws teeb meem rau koj ib leeg thiab saib xyuas cov kev pabcuam.
