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 ya ƙunshi mahimman alamomin aiki don tef ɗin PTFE mai zafin jiki da aka yi amfani da shi a cikin suturar iska, jiyya mai zafi da makamantansu. Mahimman buƙatun sun bambanta da yawa daga amfani da yanayi: fitar da gas shine mafi mahimmanci (TML≤1%, CVCM≤0.1%; Aerospace/nauyin gani na buƙatar TML≤0.5%, CVCM≤0.01%); Dole ne a tabbatar da juriya na zafin jiki don duka PTFE substrate (260 ° C) da Layer m; Ana buƙatar PSA na silicone mai ƙarancin gas mai tsafta musamman don hana kamuwa da siloxane; Babban zafin jiki mai riƙe da iko yana hana haɓakawa da haɓakawa; tsabta ba ya buƙatar zubar da fiber da ƙananan abun ciki na ionic; tef anti-static (resistance surface 10⁶-10⁹ Ω/sq) yana hana lalacewar ESD; Dole ne a kimanta juriya na plasma don matakan sputtering / PECVD; thermal shrinkage kasa 2% yana tabbatar da daidaiton abin rufe fuska.

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.

Wannan labarin yana kwatanta yanayin ɗaki da zafin jiki mai girma na mannen matsi na silicone don tef ɗin PTFE. Babban zafin jiki balagagge (120-180 ° C) yana haifar da manyan hanyoyin sadarwa masu haɗin gwiwa tare da ƙarfin haɗin kai mai ƙarfi, yana hana ragowar mannewa bayan kwasfa. Yana samar da haɗin haɗin sinadarai tare da PTFE substrates ta hanyar haɗin gwiwa na farko, yana kawar da haɗarin lalata. Babban zafin jiki balagagge kuma yana kawar da ƙananan ƙananan ƙwayoyin cuta kafin bayarwa, yana hana kumburi da gurɓataccen mai na silicone yayin dumama na farko.

Wannan jagorar ya ƙunshi zaɓin tef ɗin zafin zafin jiki na PTFE don gyaran gyare-gyaren allura da aikace-aikacen rigakafin sanda. Zaɓin tushen zafin jiki: ≤260 ° C don robobi na gabaɗaya (daidaitaccen tef ɗin PSA na silicone, 0.13-0.18mm); 260-300 ° C don robobi na injiniya na zafin jiki kamar PC, PA66, POM (manufin silicone mai zafi, 0.18-0.25mm); 300-400°C don PEEK, LCP, PPS kusa da masu gudu masu zafi (tef ɗin mannewa ya gaza; yi amfani da zane na PTFE mara ɗaure ko fim ɗin PFA). Zaɓin tushen kayan abu: kayan tacky suna buƙatar babban-saki mai tsabta PTFE; Gilashin / kayan da aka cika ma'adinai suna buƙatar nauyin nauyin 0.25mm + tef mai jurewa; abubuwan da ke lalata abubuwa suna buƙatar mannen sinadarai mai juriya da maɗauri mai yawa; aikace-aikace masu ƙarfi suna buƙatar tef ɗin PTFE baƙar fata mai-tsaye.

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.

PTFE-rufi fiberglass zane da aka yadu amfani a roba sarrafa domin ta zafi juriya, da mara sanda dukiya, da kuma low gogayya. Maɓalli na aikace-aikacen sun haɗa da: na'urorin saki don faranti / ɓarna vulcanization da gyare-gyaren taya; bel ɗin jigilar da ba na sanda ba don buɗaɗɗen niƙa, kalanda, da layukan sanyaya; zanen interleave don ajiyar roba da aka kammala; na musamman handling na silicone da fluororubber; da tanda don bayan warkewa. Fa'idodin sun haɗa da kawar da mannewa, rage amfani da wakili na saki, hana abin nadi, da tabbatar da rushewar sassauƙa.

Low sintering bar PTFE unmelted, haddasa micro-pores, matalauta adhesion, m saman, low inji ƙarfi, da madara bayyanar. Yin zafi yana ƙasƙantar da PTFE, samar da raƙuman ruwa, kumfa, raguwa, launin rawaya-zuwa-baƙi, da hayaƙi mai guba. Dukansu suna lalata ƙaƙƙarfan ƙaƙƙarfan aiki, aikin rashin tsayawa, sassauci, rufi, da kwanciyar hankali. Mafi kyawun kewayon 370-400 ° C yana haifar da tsaka-tsaki, santsi, rufin tan. Duban gani: matte fari = ƙarƙashin-sintered; yellow/brittle = over-sintered. (296 hotuna)