Wannan labarin ya shafi yadda za a dace shafi na'ura line gudun da tanda tsawon don tabbatar organosilicone m kai manufa curing digiri ga high-zazzabi PTFE tef. Ƙa'idar da ta dace da mahimmanci: jimlar lokacin zama t_total = ingantaccen tsawon tanda L ÷ saurin layin v dole ne ya zama ƙasa da mafi ƙarancin lokacin magani. Sami halayen magani ta hanyar DSC ko gwaje-gwajen warkarwa na manne da ke kafa dangantaka 'zazzabi - mafi ƙarancin lokacin magani'. Daidaitaccen samfurin magani: raba tanda zuwa yankuna, ƙididdige ti=Li/v da tcure(Ti), tabbatar ∑(ti/tcure(Ti)) ≥1. Hanyoyin ƙididdiga: saita yankunan zafin jiki tare da tsayin Li da yanayin zafi Ti; saita saurin layi v, ƙididdige lokacin mazaunin kowane yanki da rabon gudummawa; sake maimaita har zuwa jimlar ≥1 (shawarar iyakar tsaro 1.1-1.2).

Wannan labarin ya ƙunshi hanyoyin da za a sarrafa crystallinity na PTFE shafi a kan Teflon high-zazzabi zane. Ka'idar sanyaya ta fi kai tsaye da tasiri: Saurin sanyaya (quenching) ta hanyar labulen iska mai sanyi, sanyaya rollers ko tankunan ruwa - sarƙoƙin ƙwayoyin cuta suna daskare kafin tsari, suna ƙirƙirar ƙananan lu'ulu'u marasa kyau; shafi yana da taushi, mai tauri tare da ingantaccen aikin da ba na sanda ba, dan kadan rage taurin / juriya. Jinkirin sanyaya (annealing) ta hanyar adana zafi a 10-50 ° C / h ko sanyaya tanderu - sarƙoƙi na ƙwayoyin cuta suna shirya cikakke cikin manyan spherulites; shafi yana da high taurin, fice lalacewa juriya, barga girma dabam, rage sassauci da kuma ƙara brittleness.

Wannan labarin ya ƙunshi aikace-aikacen Teflon mai zafi mai zafi a cikin tanda mai zafi da iska mai zafi. Yiwuwa: ana iya amfani da shi azaman matashin mara sanda akan bel ɗin raga ko trays lokacin zafin tanderu ≤260°C (bushewar zafi mara ƙarfi, cirewar ɗaure, slurry curing) - yana haɓaka haɓakar rushewa da ɗaukar inganci. An haramta shi sosai a matsakaici / yanayin zafi (300-950 ° C) - PTFE yana lalata sakin HF mai guba da perfluoroisobutylene, lalata kayan aiki da haifar da guba mai mutuwa. Ka'idar aminci: idan zafin tanderu ba a bayyana ba ko ba za a iya garantin ƙasa da 260 ° C ba, kar a yi amfani da shi. Mahimman abubuwa: ci gaba da sabis -70 ° C zuwa 260 ° C, gajeren lokaci 300 ° C; matsanancin rashin sanda da sinadarai; kyakkyawan rufin lantarki; ƙananan juzu'i (~ 0.04); Gilashin fiberlass tushe yana ba da ƙarfin ƙarfi mai ƙarfi.

Wannan labarin ya kwatanta bambance-bambance tsakanin infrared radiation dumama da zafi-iska wurare dabam dabam dumama curing hanyoyin a crosslinked tsarin uniformity na silicone m yadudduka. Hanyoyin canja wuri mai zafi: iska mai zafi yana dogara ga convection-convection tare da zafin jiki mai laushi, ƙananan ƙananan zafin jiki na ciki / waje; IR yana da ƙayyadaddun zurfin shigar ciki tare da ƙaƙƙarfan shayar da ƙasa (dubun zuwa ɗaruruwan micrometers) ƙirƙirar gradient mai zurfi-zuwa-ciki. Tasiri kan daidaituwar haɗin kai: iska mai zafi yana ba da damar yin aiki tare tare da ciki da waje tare da madaidaicin haɗin giciye; IR yana haifar da shimfidar shimfidar wuri don samar da fim mai yawa 'fim ɗin fata' da sauri wanda ke hana tafiyar da zafi da motsin sarkar ciki, yana haifar da ƙarancin haɗin kai yana raguwa daga saman zuwa ciki.

Wannan labarin ya ƙunshi bambance-bambance tsakanin PTFE emulsions samar ta hanyar dakatarwa polymerization vs watsawa polymerization. Bayyanawa: polymerization dakatarwa ba zai iya samar da emulsion PTFE kai tsaye ba; emulsion na gaske na PTFE ya zo ne kawai daga polymerization watsawa. 'Hanyar dakatarwa' emulsion shine ainihin dakatarwar mai ruwa ta ƙasa-polymerized resin micropowders. polymerization watsawa (primary emulsion): mai siffar zobe barbashi (0.1-0.3μm, kunkuntar rarraba), stabilized da perfluorinated surfactants, musamman high kwayoyin nauyi (> 94% crystallinity), karfi fibrillation, na bukatar 380 ° C sintering ta samar da ci gaba m fim.

Wannan labarin ya ƙunshi yadda za a daidaita zafin jiki na bazuwar da rabin rayuwar peroxide crosslinking agents (BPO da DCP) tare da taga aikin warkewa don Teflon tef. Bayanan mahimmanci: BPO - 1-min rabin rayuwa a ~ 131 ° C, 1-hr a ~ 92 ° C, 10-hr a ~ 72 ° C; DCP - 1-min a ~171°C, 1-hr a ~135°C, 1-hr a ~115°C. Matukar ma'anar: manne yana buƙatar 97-99% crosslinking = 5-7 rabi-rayu; lokacin warkewa = 5-7 × rabin rayuwa a zafin da aka yi niyya. Ƙirar baya-ƙididdigar zafin jiki daga lokacin zama na layin samarwa ko ƙididdige lokacin baya daga matsakaicin zafin zafin da aka yarda.

Wannan labarin maida hankali ne akan hankula line gudun kewayon ga PTFE high-zazzabi masana'anta impregnation samar line. Matsakaicin gudun: 2-15 m/min, barga aiki kewayon 3-8 m/min, bakin ciki yadudduka / high-gudun Lines har zuwa 10-15 m/min. Matsaloli daga shigar ciki impregnation: masana'anta dole ne a cika cika da PTFE emulsion cikin fiber dam insides - ma high gudun sa rashin isasshen impregnation, guduro yunwa da bushe zaruruwa; emulsion danko, daskararrun maida hankali, masana'anta saƙa yawa duk rage shigar azzakari cikin farji kudi, bukatar a hankali gudun ga lokacin farin ciki / m yadudduka. Rufin wucewa: wucewa da yawa (2-6+) da ake buƙata don rufewa mara lahani mai yawa; na farko a hankali don angawa, za a iya ƙara madaidaicin izinin wucewa.

Wannan labarin ya kwatanta bambance-bambance tsakanin infrared radiation dumama da zafi-iska wurare dabam dabam dumama a crosslinked tsarin uniformity na silicone m Layer. Hanyoyin canja wurin zafi: iska mai zafi shine convection-convection, m da ci gaba, samar da matsakaicin zafin jiki; IR shine radiyo-sha tare da tsananin shayar da ƙasa (micrometers zuwa millimeters) yana ƙirƙirar gradient mai zurfi-zuwa-ciki. Tasiri kan rarraba giciye mai yawa: iska mai zafi yana ba da damar ciki da na waje don shigar da kewayon zafin jiki na vulcanization kusan lokaci guda, yana samar da nau'in haɗin haɗin haɗin kai tare da kauri; IR yana haifar da shimfidar wuri don warke nan take da ke haifar da fata mai yawa wanda ke hana canja wurin zafi, wanda ke haifar da ƙwaƙƙwaran ƙaƙƙarfan ƙaƙƙarfan ƙima yana raguwa daga saman ciki.

Wannan labarin ya ƙunshi abun ciki na silica da yanayin aikace-aikacen masana'anta na fiber gilashin silica. Silica abun ciki ƙayyadaddun bayanai: core nuna alama SiO₂ ≥96% (misali 96-98%, premium maki> 99% via acid leaching da sintering, gabatowa tsarki ma'adini fiber). Ƙirƙira: Gilashin gilashin E-gilashi yana jurewa ruwan acid mai zafi don narkar da abubuwan da ba silica ba (boron oxide, sodium oxide), ƙirƙirar kwarangwal mai ƙyalƙyali mai ƙyalƙyali, sa'an nan kuma an yi shi don haɓakawa. Babban fa'idodin: ci gaba da sabis a 900 ° C a cikin yanayi mai oxidizing, ɗan gajeren lokaci sama da 1200 ° C, wurin laushi kusa da 1700 ° C; kwanciyar hankali na sinadarai akan mafi yawan acid/alkalis ban da HF da zafi phosphoric acid; low dielectric akai da kuma barga rufi a high yanayin zafi.

Wannan labarin yana bayyana halayen ƙananan ƙwayoyin Teflon na masana'anta masu zafin jiki. Substrate kwarangwal: gilashin fiber saƙa texture a fili / twill saƙa tare da babban porosity (micron-sikelin pores a cikin fiber daure da kuma a warp-weft nodes) samar da sarari ga PTFE impregnation. Rufi ilimin halittar jiki: cikakken impregnation encapsulation forming 'reinforced kankare' Tsarin inda gilashi zaruruwa ake ƙarfafa lokaci, PTFE ne ci gaba da matrix; ƙananan nodular microstructure na nodules (barbashi) da ke haɗuwa da fibrils masu kyau da aka kafa a lokacin sintering; ci gaba da ɗigon fata mai yawa (da yawa zuwa dubun microns lokacin farin ciki) na PTFE mai tsafta a matsayin maɓalli mai shinge don rashin kuzarin sinadarai, kaddarorin da ba na sanda ba, da rufin lantarki.