PTFE- TACHIMATA fiberglass nsalu ndi zinthu gulu opangidwa ndi impregnating fiberglass nsalu ndi polytetrafluoroethylene (PTFE) kupezeka ndiyeno sintering pa kutentha kwambiri. kapangidwe kake akhoza kugawidwa m'magawo awiri: PTFE ❖ kuyanika ndi fiberglass m'munsi nsalu.
M'malo owonongeka ndi mankhwala, kusintha kwapangidwe kumadalira mtundu, ndende, ndi kutentha kwa sing'anga yowononga, komanso ngati ikulimbana ndi zokutira kapena gawo lapansi. Tiyeni tiwunikire wosanjikiza uyu ndi wosanjikiza kuchokera momwe amawonera opanga nsalu za fiberglass za PTFE:
I. Kusintha kwa PTFE Coating: Kukhazikika Kwambiri Pamilandu Yochuluka
PTFE imadziwika kuti 'King of Plastics' chifukwa champhamvu zake zomangira za carbon-fluorine komanso kusakhazikika kwamphamvu kwamankhwala. M'madera omwe amawononga mankhwala (kuphatikizapo kuwira kwa aqua regia, sulfuric acid, nitric acid, organic solvents, etc.), mapangidwe ake a molekyulu sasintha kwenikweni. Komabe, pazifukwa zowopsa izi, dongosololi lidzawonongeka:
1. Zitsulo Zosungunuka za Alkali / Njira Zamchere Zamphamvu (monga sodium, potaziyamu, sodium hydroxide pa kutentha kwambiri)
- Kusintha Kwamapangidwe: Zitsulo za alkali zimachotsa maatomu a fluorine kuchokera ku PTFE, zomwe zimapangitsa kuti pakhale dehydrofluorination. Magulu a -CF₂- mu unyolo wa maselo amawonongeka, ndikupanga ma bondi awiri a carbon-carbon (-C = C-) ndipo kenako amatsogolera ku carbonization.
- Maonekedwe a Macroscopic: Chophimbacho chimasintha kuchokera ku zoyera zamkaka / zowoneka bwino kukhala zofiirira kapena zakuda, zimasiya kusinthasintha, zimasanduka zofewa, ndi ufa. Izi ndizomwe zimawonongeka ndi mankhwala.
2. Mphamvu Zopangira Fluorinating ndi Ma Halogenated Hydrocarbons Ena (pansi pa kutentha ndi kupanikizika)
- Elemental fluorine (F₂), chlorine trifluoride (ClF₃), ndi othandizira ofanana amatha kuthyola msana wa carbon-carbon, ndikupangitsa kuti zokutira ziwonongeke.
- Pa kutentha kwambiri ndi kupanikizika, zosungunulira zamtundu wa Freon zingayambitse kutupa kwakukulu kwa PTFE. Ngakhale kusintha kwamankhwala sikungachitike, mawonekedwe ake amavutika ndi kuchepetsedwa kwa crystallinity, kufalikira kwa voliyumu, komanso kutaya mphamvu chifukwa cha unyolo wa mamolekyulu akukakamizika.
3. Wamphamvu Oxidizing Acids pa Kutentha Kwambiri
- Kumizidwa kwanthawi yayitali mu fuming nitric acid kapena otentha kwambiri sulfuric acid kumatha pang'onopang'ono oxidize pamwamba pa PTFE, kuyambitsa magulu a polar monga magulu a carbonyl ndi hydroxyl, ndikuwonjezera mphamvu padziko lapansi. Komabe, izi siziwoneka kawirikawiri m'machitidwe ochiritsira.
II. Zosintha mu Fiberglass Base Fabric: Ulalo Wofooka Wazinthu Zonse
Zigawo zazikulu za fiberglass ndi silicon dioxide (SiO₂) ndi ma oxide achitsulo. Gawoli likangowonongeka, mawonekedwe onse a nsalu yotentha kwambiri adzagwa.
- Chiwonetsero cha Macroscopic: Nsaluyo imataya mphamvu mwachangu, imakhala ngati khungu lofewa lokhala ndi zokutira zotsalira, kung'ambika mosavuta pokoka, ndikulekanitsa kwakukulu pakati pa zokutira ndi gawo lapansi. Ichi ndiye chiwonongeko chowopsa kwambiri chamankhwala pamagalasi opangidwa ndi fiber. Malingana ngati pali ma pinholes mu zokutira kapena m'mphepete mwake, zowonongeka zimakhala zowononga.
2. Kuwotcha Pang'onopang'ono ndi Alkalis Wamphamvu (makamaka alkali woyikira kwambiri)
- Kusintha Kwamapangidwe: OH⁻ ma ion amathyola zomangira za siloxane (-Si-O-Si-) mu netiweki yamagalasi, kupanga ma silicates osungunuka. Ulusiwu umasintha kuchoka ku yosalala kukhala yoyipa, pomwe maenje opindika ndi ming'alu amawonekera, ulusi wake umachepa, ndipo pamapeto pake umang'ambika.
- Kuwonekera kwa Macroscopic: Mphamvu zimachepa mosalekeza, nsaluyo imakhala yofewa, ndipo ikapindika, ulusi wosweka umalowa mkati mwa zokutira, zomwe zimapangitsa kuti zokutira kung'ambika ndikung'ambika.
3. Acidic Media (kupatula hydrofluoric acid)
- Kusintha Kwamapangidwe: Ma asidi wamba (hydrochloric acid, sulfuric acid, etc.) amakonda kutulutsa zinthu zopanda silika (monga aluminium, calcium oxides, etc.) kuchokera ku fiberglass, kusiya makamaka mafupa a silica. Njirayi imadziwika kuti 'leaching,' kupanga kachulukidwe kakang'ono ka ulusi.
- Mawonetseredwe a Macroscopic: Nsaluyo imakhala yolimba komanso yowonongeka, ndi kusintha kwa shrinkage, ngakhale mawonekedwe onse amatha kusungidwa. Mphamvu zimachepa chifukwa cha kupsinjika maganizo.
III. Zosintha pa Chiyankhulo Chophatikiza: Kulephera Kobisika
Malo okhala ndi mankhwala nthawi zambiri saukira mutu koma m'malo mwake amalowa m'mphepete kapena kudzera pazovuta zazing'ono.
- Kulowa ndi Kuwonongeka: Zosungunulira za organic kapena ma asidi amalowa m'miyendo, ming'alu yaying'ono, kapena m'mphepete mwa zokutira za PTFE, ndikuukira magalasi a fiberglass. Zomwe zimapangidwira kapena zakumwa zolowera zimaunjikana pamawonekedwe, kutulutsa kuthamanga kwa osmotic, kuchititsa kuti PTFE ❖ kuyanika kuti chithuza ndi delaminate kuchokera ku fiberglass gawo lapansi pamlingo waukulu.
- Stress Corrosion Cracking: Nsalu yotentha kwambiri imakhala yovuta mukamagwiritsa ntchito. Kuwonongeka kwa fiberglass ndi ma media media (makamaka alkalis amphamvu) kumachita mogwirizana ndi kupsinjika kwamakina, kuchititsa ming'alu kufalikira mwachangu motsatira njira ya ulusi wozungulira, zomwe zimapangitsa kuti nsaluyo iphwanyike mwadzidzidzi ndi mawonekedwe oyera ophwanyika popuma.
M'malo owononga mankhwala, kusintha kwapangidwe kwa nsalu ya PTFE-yokutidwa ndi fiberglass kungafotokozedwe mwachidule monga: 'King of Plastics' zokutira zimakhalabe zokhazikika ngati phiri, pamene nsalu ya fiberglass-imodzi italowa kapena kuukira-imakhala chidendene cha Achilles, zomwe zimapangitsa kuti mafupa awonongeke, kusungunuka, kusungunuka ndi kusungunuka kwa zinthu zonse.
Ngati mukufuna kudziwa zambiri za magawo, zochitika zamagwiritsidwe ntchito, ndi zosankha makonda pazogulitsa zathu zonse, kuphatikiza nsalu ya PTFE-yakutidwa ndi fiberglass, tepi ya fiberglass ya PTFE, malamba a mauna a PTFE, malamba osasunthika omata, mbali imodzi ya PTFE yokhala ndi mawonekedwe apamwamba, chosagwira fiberglass nsalu-chonde omasuka kulankhula nafe:
