PTFE sananne ne don rashin kuzarin sinadari - galibi ana kiransa 'Sarkin Filastik.' Yana tsayayya da kusan dukkanin acid, alkalis, da sauran abubuwan da ake amfani da su a dakin da zafin jiki. Duk da haka, 'kusan duka' ba ' duka ba ne.' A ƙarƙashin matsanancin yanayi - yawan zafin jiki, yawan maida hankali, ko a cikin narkakkar yanayi - wasu sinadarai na iya kai hari ga PTFE. Kuma ko da lokacin da PTFE kanta ta tsira, ƙananan fiberglass substrate na iya zama mai rauni idan murfin yana da lahani.
Fahimtar waɗannan iyakoki yana da mahimmanci don zaɓar masana'anta na PTFE a cikin mahallin sinadarai masu tsauri.
Aokai PTFE ya gwada yadudduka masu rufaffiyar PTFE akan sinadarai masu tsauri. Wannan jagorar ya bayyana abin da ke lalata PTFE kai tsaye, abin da ke kai hari ga ma'aunin fiberglass, da yadda za a guje wa kasawa.
Yadda Lalata Ke Faruwa - Hanyoyi Biyu
PTFE high-zazzabi masana'anta kunshi sassa biyu: wani PTFE shafi (ba bakin ciki, ba sanda, chemically inert) da fiberglass substrate (ba da ƙarfi amma yana da rauni ga wasu sunadarai). Lalata yana faruwa ta hanyoyi biyu:
1. Kai tsaye yashwa na PTFE shafi
Wannan yana faruwa ne kawai a ƙarƙashin matsanancin yanayi - yawan zafin jiki, babban taro, ko a cikin narkakken yanayi. A yanayin zafi na ɗaki, PTFE kusan ba shi da kariya daga harin sinadarai kai tsaye.
2. Lalacewa na fiberglass substrate ta hanyar lahani
Sinadarai suna shiga ramuka, tarkace, ko ƙananan fashe-fashe a cikin murfin PTFE kuma suna kai hari kan filayen gilashin. PTFE kanta na iya yin kyau har yanzu, amma masana'anta sun rasa ƙarfin injin kuma yana iya tsage cikin sauƙi. Wannan yanayin gazawar gama gari ne lokacin da murfin ya lalace.
Sinadaran da ke kai wa PTFE hari kai tsaye
Wadannan abubuwa suna amsawa tare da PTFE kanta, amma a ƙarƙashin matsanancin yanayi.
1. Narkakken alkali karafa - mafi yawan hali
Molten sodium (Na), potassium (K), da lithium (Li) tsiri atom na fluorine daga PTFE, haifar da carbonization, baƙar fata, da foda na saman kayan. Maganin sodium-naphthalene da aka yi amfani da shi don PTFE etching yana aiki akan wannan ka'ida.
Tasiri: Cikakken lalata tsarin PTFE.
Sharuɗɗa: Duk wani fallasa zuwa narkakkar alkali (sama da wuraren narkewarsu, misali, Na a 98°C).
Shawara: Ka guji gaba ɗaya. Yi amfani da fim ɗin PTFE mai tsabta kawai idan ya zama dole, har ma da taka tsantsan.
2. Ƙarfin ma'aikatan fluorinating a babban yanayin zafi
Wadannan abubuwa na iya kara bazuwar PTFE a karkashin zafi mai zafi:
Gas na fluorine (F₂): Yana haifar da lalata a hankali a babban zafin jiki da matsa lamba.
Interhalogen fluorides: Sunadaran da ke da ƙarfi sosai kamar chlorine trifluoride (ClF₃) da bromine pentafluoride (BrF₅) na iya haifar da halayen haɗari ko ma konewar PTFE a yanayin zafi mai yawa.
Fluorides mai ƙarfi mai ƙarfi: Misali, xenon difluoride (XeF₂).
Shawarwari: Ka nisanta masana'antar PTFE daga waɗannan sinadarai, musamman a yanayin zafi mai tsayi.
3. Narkar da alkalis mai ƙarfi a yanayin zafi
Molten sodium hydroxide (NaOH) da potassium hydroxide (KOH) sannu a hankali suna lalata saman PTFE sama da 300 ° C, yana haifar da asarar hydrophobicity da sheki. A ƙasa 300 ° C, PTFE yana tsayayya da alkalis da kyau. A dakin da zazzabi, babu wani tasiri.
4. Karfe foda mai amsawa a yanayin zafi
Magnesium foda (Mg), aluminum foda (Al), da makamantansu kayan suna amsa da ƙarfi tare da PTFE a yanayin zafi mai zafi, suna samar da furotin ƙarfe da carbon. Wannan shine tushen wasu kayan aikin pyrotechnic da abubuwan ƙonewa waɗanda ke ɗauke da PTFE.
Sinadaran da ke Kalubalantar Matsalolin Fiberglas Ta hanyar Lalacewar Rufewa
Wadannan sinadarai ba sa amsawa tare da PTFE, amma idan murfin PTFE yana da kowane nau'i na pinhole, karce, ko bayyanar gefen, za su shiga kuma su lalata fiberglass.
1. Hydrofluoric acid (HF) - mafi haɗari
Hydrofluoric acid yana lalata fiberglass sosai. Yana amsawa da sauri tare da silicon dioxide (babban bangaren gilashi) don samar da gas na tetrafluoride na silicon, yana narkar da filayen gilashi.
PTFE kanta yana tsayayya da HF daidai - PTFE ana amfani dashi sau da yawa don kayan aiki na HF.
Koyaya, masana'anta mai rufaffiyar PTFE BA lafiya ga HF sai dai idan rufin ba shi da cikakkiyar fa'ida (wanda yake da matukar wahala a ba da garanti). Duk wani lahani zai ba da damar HF ta shiga cikin fiberglass, yana haifar da gazawar masana'anta da sauri.
Shawarwari: Don sabis na HF, yi amfani da fim ɗin PTFE mai tsafta (babu ƙarfafa gilashin fiberlass) ko cikakken layin PTFE tare da ingantattun ramukan sifili.
2. alkalis mai mahimmanci a yanayin zafi mai yawa
Maganin mai da hankali sosai na sodium hydroxide (NaOH) a babban zafin jiki na iya lalata fiberglass ta rashin lahani. Zazzabi-ɗaki, alkalis dilute suna da lafiya.
3. Ma'auni na phosphoric acid a babban yanayin zafi
Tsawon lokaci mai tsawo tare da phosphoric acid mai zafi zai haifar da lalata zuwa fiberglass. Bugu da ƙari, PTFE kanta yana tsayayya da shi, amma lahani na sutura shine maƙasudin rauni.
Muhimman Tunatarwa don Sabis ɗin Sinadari
1. Yawancin gazawar sun kasance daga lalacewa na inji ko tsufa, ba harin sinadarai ba
A cikin aikace-aikacen masana'antu na yau da kullun (tsararrun sinadarai, sarrafa abinci, da sauransu), masana'anta na PTFE sun gaza saboda abrasion, tsagewa, ko lalatawar zafi tun kafin lalata sinadarai ta zama batun. Rashin rashin kuzarin sinadarai na PTFE na gaske ne kuma abin dogaro ga kusan dukkanin sinadarai na yau da kullun har zuwa 260 ° C.
2. Idan dole ne ku yi amfani da sinadarai masu tayar da hankali, yi amfani da fim ɗin PTFE mai tsabta
Don aikace-aikacen da suka haɗa da narkakken alkali karafa, HF mai zafi mai zafi, ko ma'auni mai ƙarfi, fiberglass mai rufi na PTFE ba a ba da shawarar ba . Maimakon haka, yi amfani da:
Fim ɗin PTFE mai tsabta (skived ko jefawa) ba tare da ƙarfafa fiberglass ba
ƙarfe mai layi na PTFE Kayan aikin
PFA ko FEP (sauran fluoropolymers tare da irin wannan juriya amma kaddarorin inji daban-daban)
3. Koyaushe gwada kafin cikakken amfani
Idan aikace-aikacenku ya ƙunshi sinadarai waɗanda ba a jera su azaman 'aminci' a cikin daidaitattun sigogin dacewa ba, gudanar da gwajin dacewa a cikin ainihin yanayin aiki (zazzabi, maida hankali, tsawon lokaci). Aokai PTFE na iya samar da samfuran gwaji don tabbatarwa.
Takaitawa – Daidaituwar Sinadari Mai Saurin Magana
Aokai PTFE yana ba da jagorar daidaitawar sinadarai kuma yana iya ba da shawarar samfurin da ya dace - masana'anta mai rufi na PTFE don yawancin aikace-aikacen, ko fim ɗin PTFE mai tsabta don matsanancin sabis na sinadarai. Tuntube mu tare da takamaiman sinadarai, zafin jiki, da lokacin fallasa.
Idan kana son ƙarin koyo game da cikakkun bayanai dalla-dalla, yanayin aikace-aikacen da keɓaɓɓen mafita don kewayon samfuranmu, gami da masana'anta masu zafin jiki na PTFE, kaset ɗin zafin jiki na PTFE, bel ɗin raga na PTFE, bel ɗin haɗin gwiwa mara ƙarfi, zane mai gefe guda PTFE, high-zazzabi mai jurewa isar da bel ɗin mu da bel ɗin fiberglas mai ƙarfi, ƙwanƙwasa fiberglas ɗin mu
