Wannan labarin ya gabatar da cikakken asali tsari don impregnating fiberglass masana'anta da PTFE emulsion. Matakai bakwai masu mahimmanci: ① Pretreatment (dewaxing / dewaxing) a 350-400 ° C don cire ma'aunin ma'auni; ② Tsarin emulsion tare da 40-55% m abun ciki da surfactants don inganta wetting; ③ Ciwon ciki ta hanyar tsoma-matsi ko murfin ruwa na likita; ④ Drying a 100-150 ° C don cire ruwa a hankali kuma ya samar da fim din PTFE bushe; ⑤ Sintering a 360-390 ° C (har zuwa 400 ° C) don narke sassan PTFE a cikin fim mai ci gaba; ⑥ Multi-cycle impregnation-bushewa-sintering maimaita sau 2-4 don isa manufa kauri da guduro abun ciki (45-65%); ⑦ Bayan jiyya ciki har da maganin korona, gyaran fuska, iska da dubawa mai inganci. Mahimman abubuwan sarrafawa: cikakken dewaxing, cikakken emulsion wetting, bushewa a hankali, madaidaicin zafin jiki, da daidaiton sutura. Kayayyakin suna hidimar laminati masu ɗaure da tagulla, bel masu zafi mai zafi da kayan membrane na gine-gine.

Wannan labarin yana gabatar da kaushi na halitta wanda PTFE babban zafin jiki na zane zai iya jurewa. Gilashin fiberglass mai rufaffiyar PTFE yana baje kolin inertness na musamman, yana tsayayya da kusan duk abubuwan kaushi na yau da kullun a ƙarƙashin yanayin aiki na yau da kullun ba tare da narke, kumburi ko halayen sinadaran ba. Abubuwan da za a iya jurewa sun hada da: alcohols (methanol, ethanol, isopropanol), ketones (acetone, MEK, cyclohexanone), esters (ethyl acetate, butyl acetate), hydrocarbons (man fetur, toluene, xylene, hexane), halogenated hydrocarbons (dichloromethane, chloroform, carbon ethers acid tetras, chloroform, chloride ethers tetras). (glacial acetic acid, formic acid), amines da amides (triethylamine, DMF), phenols, da sauransu kamar carbon disulfide, pyridine, silicone man da birki ruwa.

Wannan labarin ya ƙunshi buƙatun sanyaya lokacin PTFE babban zafin jiki na zane sintering. Bayan dasa shuki a 380-400 ° C, masana'anta dole ne su wuce da sauri ta yankin 310-315 ° C crystallization-m. Adadin sanyaya da aka ba da shawarar shine aƙalla 30-50°C/min (tufafin bakin ciki zai iya cimma 100-200°C/min ta hanyar sanyaya iska). Saurin sanyaya (quenching) yana haifar da ƙarancin crystallinity (45-50%), yana ba da taushi, sutura masu tauri tare da filaye masu santsi, mannewa mai ƙarfi, kyakkyawan aiki mara ƙarfi, da juriya ga delamination da fatattaka. Jinkirin sanyaya (sanyiwar tanderu) yana haifar da babban crystallinity (60-70%), yana haifar da tsattsauran ra'ayi, gaɓoɓin sutura masu saurin raguwa, kwasfa da microcracks.

High-tensile PTFE high-zazzabi zane da aka sanya ta shafi PTFE uwa high-ƙarfi fiberglass masana'anta, miƙa tensile ƙarfi, zafi juriya, wadanda ba sanda Properties, sinadaran juriya, da kuma low gogayya. Mahimmin aikace-aikacen sun haɗa da: isar da masana'antu (marufi na rage zafi, yin burodin abinci, bushewar yadi, bushewar takarda / fim); haɗe-haɗen gyare-gyaren kyallen saki da ɗorawa masu zafi masu zafi; walƙiya labule masu kariya da jaket ɗin zafi mai zafi; injin lantarki da rufin wuta; ginin zamiya bearings da bututun goyon bayan; tacewa sinadarai da kulle bawul a cikin mahalli masu lalata. Ƙarfin ƙarfi mai ƙarfi yana tabbatar da dorewa a ƙarƙashin tashin hankali, tsagewa, maimaita juzu'i, da matsanancin zafi na inji a cikin waɗannan aikace-aikacen nauyi daban-daban.

A lokacin sintering, PTFE barbashi a kan fiberglass masana'anta narke sama da 327 ° C, lalata asali folded sarkar lamellae da barbashi iyakoki don samar da wani amorphous narkewa. Bayan sanyaya, PTFE recrystallizes cikin spherulites kunshe da radially daidaitacce lamellae, tare da crystallinity jeri 50-70%. Kwancen kwantar da hankali yana ƙayyade ƙimar crystal: jinkirin sanyaya yana haifar da mafi girma crystallinity, mafi girma spherulites, mafi girma taurin; saurin quenching yana ba da mafi kyawun spherulites da ingantaccen sassauci.

Wannan taƙaitaccen bayani na fasaha daga Jiangsu Aokai yayi nazarin yadda ƙananan ƙarancin zafin jiki ko babban zafin jiki ke lalata zane mai zafin jiki na PTFE. Low sintering bar barbashi unnalk, haifar micro-pores, rauni shafi-substrate bonding, m saman, matalauta inji ƙarfi, da madara opaque bayyanar. Tsananin zafi yana haifar da lalata yanayin zafi na PTFE, samar da raƙuman ruwa, kumfa, raguwa, launin rawaya-zuwa-baƙi, da sakin hayaki mai guba. Dukkanin matsananci biyu suna lalata ƙaƙƙarfan aiki, rashin aiki, sassauci, rufi, da kwanciyar hankali.

PTFE high-zazzabi zane insulating gaskets hada high dielectric ƙarfi (barga a karkashin zafi), -70 ° C zuwa 260 ° C zafin jiki kewayon, duniya sinadaran juriya (sai narkakkar alkali karafa), ba sanda surface (hana creepage), anti-creep (fiberglass ƙarfafa vs. tsarki PTFE), high tensile ƙarfi = 0 flaction.5-μme, low flaction. rating. Idan aka kwatanta da mica, roba, da gaskets PTFE mai tsabta, zane na PTFE yana ba da sassauci mafi girma, iya aiki, da kwanciyar hankali na tsawon lokaci. Mafi dacewa don masu canzawa, rufin mota, sinadari flange sealing, da semiconductor kayan aiki.

PTFE shimfidar tufa a lokacin sintering yana buƙatar madaidaicin tashin hankali, zafin jiki, da kulawar kamewa. Hanyoyi masu mahimmanci: na'ura mai mahimmanci (filin faranti suna kula da nisa, hana raguwar weft), bayanin martabar zafin jiki (jinkirin zafi → 380-400 ° C riƙe → jinkirin sanyaya ƙasa 310 ° C kafin sakin tashin hankali), pre-shrunk substrate (yana kawar da damuwa na saƙa kafin sutura), da kauri mai launi (hana narke bambanci). Dole ne a kiyaye kamewar senter har sai an sanyaya ƙasa da ma'aunin crystallization na PTFE (kimanin 310°C) don hana wargin.

Rufe uniformity a lokacin PTFE emulsion impregnation na fiberglass masana'anta ne lifeline na samfurin ingancin. Rashin daidaituwa yana haifar da: gazawar rashin sanda (maidowa a wuraren bakin ciki), rauni na injiniya (ƙaramar damuwa, tsagewa), rashin kwanciyar hankali na lantarki (ƙaramar wutar lantarki ta ragu zuwa 1/10), shigar da sinadarai (lalata pinhole), al'amurra masu girma (warpage), da lahani (yawan belt, bambancin kauri). Rubutun Uniform yana buƙatar daidaitaccen sarrafa emulsion danko, m abun ciki, masana'anta tashin hankali, matsi gibba, da Multi-zone bushewa/sintering profiles.

Tufafin zafin jiki na PTFE yana jurewa matakai huɗu na canjin tsari yayin da zafin jiki ya tashi: ƙasa da 260 ° C - jinkirin micro-cracking da ragowar ƙari; a 327 ° C (ma'anar narkewa) - crystalline-to-amorphous miƙa mulki, shafi mai laushi, delaminates daga fiberglass; 400-500 ° C - PTFE depolymerizes (saki gas mai guba), shafi ya ɓace; sama da 500°C – Fiberglass yana laushi (840°C wurin laushi) kuma ya rasa daidaiton tsari. Tsaya ƙasa da 260°C ci gaba, guje wa kololuwar 300°C don amintaccen aiki.