Ka yi tunanin amfani PTFE tef mai zafin jiki a cikin tankin tanki mai sinadari, kunsa na igiyar ruwa, ko aikace-aikacen rufe ruwa. Tef ɗin yana nutsewa na makonni ko watanni. Zai rike? Shin manne zai gaza? Gilashin fiber zai yi laushi?
Amsar ba ta da sauƙi. PTFE kanta - 'Sarkin Filastik' - ba shi da amfani a cikin sinadarai zuwa kusan dukkan abubuwa. Amma tef ɗin PTFE ya fi PTFE kawai: yana da madaidaicin fiberglass da manne mai ƙarfi (PSA) a baya. Waɗannan abubuwan haɗin gwiwar suna da bambanci sosai a ƙarƙashin nutsewar dogon lokaci.
Aokai PTFE ya gwada maki tef da yawa a cikin yanayin nutsewa. Wannan labarin ya rushe haɗari ga ruwa, ruwan gishiri, da maganin sinadarai - kuma ya bayyana irin nau'in mannewa da ke tsira.
Ƙa'idar Gabaɗaya - PTFE Substrate Yana da ƙarfi, Adhesive Rauni ne
Don kaset masu zafi na PTFE a ƙarƙashin nutsewar dogon lokaci, ana iya taƙaita aikin gabaɗaya kamar:
Fiberglass Substrate: M - na iya yin laushi a cikin ruwa na tsawon lokaci.
Layer na mannewa: Babban wurin rauni - yana ƙasƙantar da shi a cikin dogon lokaci zuwa ruwa, kaushi, ko sinadarai.
Bangaren
Ayyukan Karkashin nutsewa
Yanayin gazawa
Farashin PTFE
Madalla
Babu ko ɗaya - ya rage rashin aiki
Fiberglas masana'anta
Matsakaici
Tausasawa, rashin ƙarfi bayan makonni/watanni
Silicone PSA
Adalci ga talakawa
Rashin mannewa, kumburi, kwasfa
Acrylic PSA
Talakawa
Ragewar lalacewa cikin sauri a cikin ruwa/kaushi
Hatsarin nutsewar Ruwa na Dogon Lokaci
Yadda ruwa ke shafar tef:
Manne Layer: Silicone matsa lamba-manne manne yana da rauni ta hanyar tsawaita bayyanarwa ga kwayoyin ruwa. Ruwa yana ratsa mahallin manne-substrate, yana rage mannewa kuma yana haifar da cikakkiyar gazawa. Ƙarfin kwasfa na iya raguwa da kusan 40% bayan nutsar da ruwa na sa'o'i 48 don wasu hanyoyin.
Fiberglass Substrate: Yawancin kaset ɗin PTFE masu zafin jiki na kasuwanci suna amfani da masana'anta na fiberglass da aka sanya tare da PTFE azaman madaidaicin. Gilashin fiberglass zai yi laushi a cikin ruwa na tsawon lokaci mai tsawo, wanda zai haifar da raguwar ƙarfin injin gabaɗayan tef ɗin. Wannan tsari ne na jinkirin (makonni zuwa watanni) amma ba zai iya jurewa ba.
Ci gaba da nutsewa na kwanaki ko makonni - ba a ba da shawarar ga daidaitattun kaset na PSA na silicone ba.
Don amfani na dindindin na ƙarƙashin ruwa, yi la'akari da tef ɗin PTFE mara ɗaure tare da gyaran injina.
Aokai PTFE yana ba abokan ciniki shawara cewa daidaitaccen tef ɗin PSA na silicone ya dace da aikace-aikace tare da tuntuɓar ruwa lokaci-lokaci (misali, wankin sarrafa abinci) amma ba don ci gaba da nutsewa sama da awanni 72 ba. Don tsawon lokaci, muna ba da shawarar mannen fluorosilicone ko maki marasa mannewa.
Nitsar da Ruwan Gishiri - Haɗari Mafi Girma
Idan aka kwatanta da ruwa mai tsafta, ruwan gishiri yana haifar da babbar barazana:
Chloride ions suna hanzarta shiga da lalacewa ga mannen Layer.
Ruwan Gishiri yana haifar da lalata mai tsanani zuwa abubuwan fiberglass - filayen gilashin na iya raguwa da rauni.
Gishiri crystallization a lokacin bushewa hawan keke iya karya da inji.
Shawarwari: Kada a yi amfani da madaidaicin tef ɗin PTFE don nutsar da ruwan gishiri na dogon lokaci (misali, naɗaɗɗen igiyar ruwa, na'urori masu auna firikwensin ruwa). Yi amfani da perfluoropolyether (PFPE) manne ko PTFE mara mannewa tare da matsi na inji.
Nitsewar Maganin Sinadari - Ya Dogara Gabaɗaya akan Manne
Tef ɗin PTFE sun yi fice a cikin juriya na sinadarai - amma wannan ya dogara da nau'in mannewa. Hadarin da ke ƙarƙashin nutsewar sinadarai sun bambanta sosai.
Nau'in mannewa
Juriya na Chemical
Shawarar Aikace-aikacen
Acrylic PSA
Talakawa - baya jurewa ga acid mai ƙarfi, alkalis mai ƙarfi, ko mafi yawan kaushi na halitta
An haramta shi sosai ga kowane nutsewar sinadarai
Silicone PSA na al'ada (na al'ada)
Matsakaici - yana tsayayya da ruwa, raunin acid, raunin alkalis, da wasu kaushi. Ya kasa kasa a cikin dogon lokaci nutsewa a cikin ma'auni mai ƙarfi acid, alkalis mai ƙarfi, da kaushi mai ƙarfi (misali, acetone, MEK)
Ya dace kawai don kariya ta fantsama sinadari mai haske - ba don ci gaba da nutsewa ba
Fluorosilicone Modified PSA
Kyakkyawan - mafi nisa fiye da silicone na yau da kullun a cikin juriya na sinadarai; jure nutsewa na ɗan gajeren lokaci
Mafi dacewa don nutsewa na matsakaicin lokaci (kwanaki zuwa makonni) da matsakaicin yanayin lalata
Perfluoropolyether / Adhesive na tushen Fluorine
Kyakkyawan - ya dace da juriya na sinadarai na PTFE; da kyar wasu sinadarai suka shafa
An fi so don mummunan yanayi mai lalacewa da nutsewar dogon lokaci (watanni). Mafi girman farashi.
Tef ɗin PTFE mai tsafta (Babu Adhesive)
Mafi girma - babu lahani da ke da alaƙa; sinadaran juriya m zuwa PTFE substrate
Babban zaɓi don nutsewar ruwa. Yana buƙatar gyare-gyaren injina (rufe zaren, ƙulla igiya, ɗaurin waya)
Lalacewar Ayyukan Jiki - Mahimman Ma'auni
Dukiya
Farashin PTFE
Manne Layer
Bayanan kula
Ƙarfin Kwasfa
N/A
Za a iya raguwa da kashi 40 cikin dari bayan nutsewar ruwa na sa'o'i 48 (don PSA mai warkewa UV)
Maɓalli mai nuna gazawar tef
Ƙarfin Ƙarfin Ƙarfi
Babu asara bayan kwanaki 200 a 250 ° C
N/A
CF shaidu suna ba da ingantaccen kwanciyar hankali
Kumburi
Babu - ko da a cikin 98% H₂SO₄ ko 40% HF
Kumburi a cikin kaushi (toluene, acetone, MEK)
Kumburi na mannewa yana kaiwa ga dagawa gefe
Juriya na Lalata
Ƙarfin 95% yana riƙe bayan 168h a cikin tafasa 37% HCl
Ya bambanta da nau'in
Fiberglass na iya kaiwa hari ta HF da tushe mai ƙarfi
Kayan Wutar Lantarki
Abin dogaro
Lalacewa na iya rage ƙarfin dielectric
Zaɓi samfuran da suka cika buƙatun rufi
Maɓalli mai ɗaukar nauyi: Tsarin PTFE yana da karko sosai. Kusan duk haɗarin lalacewa suna fitowa daga mannewa kuma, zuwa ƙaramin adadin, fiberglass substrate.
Takaitawa & Jagorar Zaɓi don Aikace-aikacen Immersion
Muhalli na nutsewa
Nau'in Tef Na Shawarar
Me yasa
Ruwa mai dadi, tsaka-tsaki
Standard silicone PSA
An yarda da su don fantsama, wanke-wanke
Ruwa mai dadi, mai ci gaba (> kwanaki 7)
Fluorosilicone PSA ko mara amfani
Daidaitaccen silicone zai rasa mannewa
Ruwan gishiri, kowane lokaci
PTFE mara mannewa + gyaran inji
Gishiri yana kai hari ga manne da fiberglass
Rauni acid/bases (pH 4-10), tsaka-tsaki
Standard silicone PSA
Abin karɓa
Ƙarfin acid / tushe, kaushi na halitta, ci gaba
PTFE mara ɗorawa (kayan aikin injiniya) ko mannen PFPE
Waɗannan ne kaɗai suka tsira
Babban zafin jiki (> 150 ° C)
Silicone ko fluorosilicone PSA
Acrylic kasa; PTFE substrate yana da kyau
A taƙaice , ana iya amfani da tef mai zafi na PTFE a cikin aikace-aikacen nutsewa - amma idan kun fahimci maki masu rauni. Substrate na PTFE kusan ba zai iya cin nasara ba. Fiberglass yana da matsakaicin rauni. Manne shine babban haɗarin gazawar farko.
Don nutsar da ruwa mai daɗi a ƙarƙashin sa'o'i 72, daidaitaccen silicone PSA abin karɓa ne. Don tsawon lokaci, ruwan gishiri, ko sinadarai masu haɗari, haɓakawa zuwa fluorosilicone, PFPE adhesive, ko - mafi kyawun duka - tef ɗin PTFE mara ɗaure tare da gyaran injina.
Kuna buƙatar takamaiman tef na PTFE don takamaiman yanayin nutsewa? Aokai PTFE yana ba da zaɓuɓɓukan mannewa da yawa kuma yana iya samar da bayanan gwaji don yanayin ku. Tuntuɓe mu tare da matsakaici, zafin jiki, da lokacin nutsewa da ake tsammanin.
Idan kuna buƙatar cikakkun bayanai dalla-dalla, jagororin aikace-aikacen, da mafita na musamman don kewayon samfuran mu, gami da masana'anta masu zafin jiki na PTFE, kaset ɗin zafin jiki na PTFE, bel ɗin raga na PTFE, bel ɗin injin fusing maras kyau, masana'anta mai gefe guda PTFE mai rufi, bel ɗin ɗaukar zafi mai zafi da babban zafin jiki na fiberglass tuntube mu: Tufafi,
