Nyati sia ƒo nu tso vovototo siwo le PTFE emulsions siwo wowɔ to suspension polymerization vs dispersion polymerization dome ŋu. Numekɔkɔ: suspension polymerization mate ŋu awɔ PTFE emulsion tẽ o; PTFE emulsion vavãtɔ tsoa kaka polymerization me ko. 'Suspension-mɔnu emulsion' nye nyateƒe tsi suspension anyigba suspension-polymerized resin micropowders. Dispersion polymerization (primary emulsion): nusue siwo le dzogoe ene me (0.1-0.3μm, mama kpuie), siwo wotsɔ perfluorinated surfactants li ke, molecule ƒe kpekpeme si lolo ŋutɔ (>94% crystallinity), fibrillation sesẽ, bia 380°C sintering be woawɔ film sesẽ si yia edzi.

Nyati sia dzro ŋusẽ si platinum catalyst ƒomevi kple eƒe susu tsɔtsɔ ɖe crosslinking kinetics of addition-cure silicone rubber ŋu ​​me. Nusiwo naa nu ʋãna ƒomeviwo: Speier nusi naa nu ʋãna (chloroplatinic acid, Pt4+) hiã be woaɖee dzi akpɔtɔ va ɖo lã ƒomevi siwo me valent sue le siwo le dɔ wɔm, siwo wɔa dɔ abe nusi naa nu ʋãna ene; Karstedt ƒe nusi naa nu ʋãna (Pt0 kple divinyltetramethyldisiloxane) gena ɖe nusiwo naa nu ʋãna ƒe tsatsam me tẽ. Ƒomevi ƒe ŋusẽkpɔɖeamedziwo: Speier ɖea induction ɣeyiɣi si dze ƒã kple S-nɔnɔme ƒe dɔyɔyɔ ƒe ʋuʋudedi (blewu kaba, kabakaba emegbe) kple dɔwɔwɔ ƒe ŋusẽ si dze abe ɖe wòkɔ wu ene fiana; Karstedt ɖea induction aɖeke fiana o, gɔmedzedze ƒe agbɔsɔsɔme si lolo kple exotherm ɖaɖɛ, activation ŋusẽ si bɔbɔ ɖe anyi wu.

Nyati sia ƒo nu tso mɔnukpɔkpɔ siwo ate ŋu asu Teflon avɔ si me dzoxɔxɔ le ŋutɔ zazã me le batri ƒe dɔwɔƒe si le dodom le nɔnɔme sesẽwo me ŋu. Nuto ene: Dry electrode/electrolyte membrane manufacturing — dzoxɔxɔ gã anti-stick conveyor belts na dzodzoe agbalẽ xatsaxatsa tete (150-250°C) si wɔnɛ be woate ŋu atsɔ film siwo léa wo ɖokui ɖe te ƒe ʋuʋu nyuie; dzodzoe roller nutsyɔnu ƒuƒoƒo abe afã-mavɔ anti-ati ƒuƒoƒo; ekpɔa egbɔ be film ƒe anyigba le gbadzaa, eɖea nusiwo gblẽ dzi kpɔtɔna, enaa nuku ƒe ŋeŋe nyona ɖe edzi. Ðe asi le liners kple cushioning pads na dzoxɔxɔ-tete densification — sulfide / polymer batriwo hiã dzoxɔxɔ isostatic / gbadzaa tete (100-300°C, MPa ewo); PTFE avɔ si woda ɖe batri ƒe ƒuƒoƒo kple aŋɔ dome xea mɔ na adhesion, enaa nyaƒoɖeamenu mama ɖekae to micro-elasticity dzi, kpɔa dzoxɔxɔ ƒe agbalẽviwo ta.

Nyati sia ƒo nu tso agbɔsɔsɔme ƒe sɔsɔ si le gel ƒe akpa sue kple cohesive ŋusẽ dome le silicone pressure-sensitive adhesives na Teflon tape. Gel ƒe akpa sue = agbɔsɔsɔme ƒe alafa memamã si le crosslinked network si me mekɔna le toluene me o (Soxhlet extraction, 24hr). Ŋusẽ si wotsɔ blaa nu si ƒe dzesi enye dzoxɔxɔ gã si léa nu ɖe ​​te (180°C, 1kg). Etɔ̃ dometsotso: le teƒe vevi te (<60%) — percolating network aɖeke meli o, si léa ŋusẽ ɖe zero gbɔ; practical range (60-85%) — cohesive ŋusẽ tsina exponentially kple gel fraction, 60%→70% doa ɣeyiɣi si woatsɔ alée ɖe dzi tso minitiwo va ɖo gaƒoƒo, 70%→80% naa 3-10x dzidziɖedzi; crosslinking kɔkɔ (>85%) — viɖewo blewu (85%→95% koe 20-50% dzina ɖe edzi), tack ɖiɖina ŋutɔ, >95% bu PSA ƒe nɔnɔmewo.

Nyati sia dzro tɔtrɔ siwo vaa PTFE molecule kɔsɔkɔsɔwo me le ultraviolet keklẽŋusẽ te me. Main-chain scission kple molecule ƒe kpekpeme dzi ɖeɖe kpɔtɔ: UV (254nm, 471 kJ/mol) gblẽa CC kadodowo (347 kJ/mol), si hea homolysis vɛ, si wɔnɛ be CF2-terminated free radicals, molecule ƒe kpekpeme ƒe ɖiɖi sesĩe, sesẽme kple didime ƒe bu. Free radical reaction pathways: le oxygen me la, peroxy radicals dzɔna, wogbugbɔ ɖoa ​​wo ɖe acyl fluoride (—COF) kple carboxylic acid (—COOH) ƒe nuwuwu ƒuƒoƒowo me, eye woɖea COF2 kple CO2 (COF2 tsia tsi me zua HF); le yamenutome siwo mewɔa dɔ o me la, masɔmasɔ/gbugbɔgaƒoƒo xɔa aƒe ɖe eme, gake kɔsɔkɔsɔ ƒe ʋuʋu gakpɔtɔ xɔ aƒe ɖe eme.

Nyati sia ƒo nu tso Teflon avɔ si me dzoxɔxɔ le ŋutɔ zazã le yamenutomewu ƒe dzoxɔxɔnutsitikewo me ŋu. Nusiwo wotsɔ wɔe ƒe vevienyenye: avɔ si wotsɔ fiberglass si ŋu wofa PTFE ɖo, si woyɔna le yamenutome be Beta avɔ, si tsɔ avɔa ƒe asitɔtrɔ le nɔnɔmewo ŋu kple PTFE ƒe nutome ƒe dɔmawɔmawɔ nyuie si gbɔ eme tsaka. Akpa si wòwɔna: Thermal Micrometeoroid Garment (TMG) ƒe gotagome ƒuƒoƒo le extravehicular mobility units me, si dze ŋgɔ vacuum tẽ, dzoxɔxɔ ƒe vovototo siwo gbɔ eme, kple micrometeoroids abe dzɔdzɔme/dzoxɔxɔ ƒe mɔxenu gbãtɔ ene na ememe aluminized films. Nutome takpɔkpɔ si gbɔ eme: te ŋu nɔa te ɖe -200°C va ɖo +260°C ƒe didime nu (ɣe dze ŋgɔ >120°C va ɖo vɔvɔli -160°C); anyigba ɣia ɖea ɣe ƒe keklẽ fiana; kpɔa polyimide film siwo wotsɔ aluminize wɔe siwo mebɔbɔ o ta tso ƒoƒo kple aɖatsi me. Ʋuʋu ƒe kpekpeɖeŋu: PTFE ƒe anyigba si me ʋuʋudedi le bɔbɔe xea mɔ na layer tangling le ƒunukpeƒe ƒe bɔbɔ me, si naa EVA te ŋu trɔna ɖe nɔnɔmewo ŋu.

Nyati sia ƒo nu tso viɖe siwo le Teflon avɔ si ƒe dzoxɔxɔ lolo ŋu zazã le lithium batri ƒe elektrikŋusẽnamɔ̃ ƒe ƒuƒu me ŋu. Wozãnɛ abe mɔ̃ siwo wotsɔna tsɔa nu alo dzodoƒe ƒe nutrenu ene, eye wokpɔa kuxi vevi etɔ̃ gbɔ: ʋuʋudedi ƒe ƒoƒo, eƒe xɔxlɔ̃, kple elektrikŋusẽ ƒe ʋuʋu. Ene viɖe teƒewo: Elektrode ƒe nyonyome kple kutsetse — anti-stick nɔnɔmewo xea mɔ na PVDF binder adhesion si wɔnɛ be bɔbɔe bliboe peeling; dzoxɔxɔ ƒe tsɔtsɔme ɖekae le 100-140°C xea mɔ na gbagbã/bibi; anyigba si le gbadzaa la ɖea ʋuʋudedi kple aŋɔ ƒe sisi ɖa; Nusiwo nɔa anyi didina kple dɔwɔwɔ ƒe liƒo — atikewo ƒe tsitretsitsi ɖe NMP solvent kple electrolyte vapors ŋu evɔ mevuvu/tsi o; tensile ŋusẽ gã kple didime li ke tso fiberglass substrate hena teƒe si sɔ pɛpɛpɛ; dzadzɛnyenye bɔbɔe kple nusiwo susɔ vie ne wotsɔe sɔ kple ga mesh belts.

Nyati sia ƒo nu tso alesi woatsɔ peroxide crosslinking agents (BPO kple DCP) ƒe gbegblẽ ƒe dzoxɔxɔ kple afã ƒe agbenɔƒe asɔ kple curing process window na Teflon tape ŋu. Nyatakaka veviwo: BPO — 1-min afã ƒe agbenɔƒe le ~ 131 ° C, 1-hr le ~ 92 ° C, 10-hr le ~ 72 ° C; DCP — miniti 1 le ~ 171 ° C, gaƒoƒo 1 le ~ 135 ° C, gaƒoƒo 10 le ~ 115 ° C. Susu si sɔ kple wo nɔewo: adhesive hiã 97-99% crosslinking = 5-7 afã-agbe; ɣeyiɣi si wotsɔ daa dɔe = 5-7 × afã ƒe agbenɔƒe le dzoxɔxɔ si woɖo taɖodzinu na me. Back-bu akɔnta dzoxɔxɔ tso production line ƒe nɔƒe alo megbe-bu akɔnta ɣeyiɣi tso dzoxɔxɔ si ŋu woɖe mɔ ɖo wu.

Nyati sia ƒo nu tso fli ƒe duƒuƒu ƒe didime si bɔ na PTFE dzoxɔxɔ gã avɔ impregnation wɔwɔ fli. Duƒuƒu si bɔ: 2-15 m/min, dɔwɔwɔ ƒe didime si li ke 3-8 m/min, avɔ tsɛwo/fli sesẽwo vaseɖe 10-15 m/min. Mɔxenu siwo tso tsidede tsi me ƒe gege ɖe eme gbɔ: ele be woatsɔ PTFE emulsion ayɔ avɔa me bliboe ɖe ka babla ƒe eme — duƒuƒu si nu sẽ akpa hea tsi si mesɔ o, resin dɔwuame kple ka ƒuƒuwo vɛ; emulsion viscosity, solids concentration, fabric weave density katã ɖea gege ɖe eme ƒe agbɔsɔsɔ dzi kpɔtɔna, si bia be woawɔ duƒuƒu blewu na avɔ siwo le kpekpem/siwo le kpekpem. Coating passes: pass geɖe (2-6+) si hiã na dense defect-free coating; gbãtɔ ƒe yiyi blewu na seke, woate ŋu adzi mɔzɔzɔ siwo kplɔe ɖo ɖe edzi le mɔ si sɔ nu.

Nyati sia tsɔ vovototo siwo le infrared radiation dzoxɔxɔ kple hot-ya circulation dzoxɔxɔ dome sɔ kple crosslinked structure uniformity of silicone adhesive layer. Dzoxɔxɔ ƒe tsɔtsɔ yi teƒe bubu ƒe mɔnuwo: ya dzodzoe nye convection-conduction, fafɛ eye wòyia ŋgɔ, si wɔnɛ be dzoxɔxɔ ƒe tɔtrɔ si sɔ; IR nye keklẽŋusẽ ƒe xɔxlɔ̃ kple yame ƒe xɔxlɔ̃ sesẽ (micrometers va ɖo milimeta) si wɔnɛ be anyigba ƒe gogloƒe yi eme ƒe ʋuʋudedi si le togbɛ dzi. Ŋusẽkpɔɖeamedzi ɖe crosslink density mama dzi: hot-ya ɖea mɔ na ememe kple egodo ƒe akpawo be woage ɖe vulcanization ƒe dzoxɔxɔ ƒe domedome le ɣeyiɣi ɖeka kloe me, si naa crosslink density ɖeka le titrime dzi; IR nana be anyigba ƒe ƒuƒoƒo da gbe le ŋutigbalẽ si le ʋeʋẽm si dzɔna enumake si xea mɔ na dzoxɔxɔ ƒe tɔtrɔ, si wɔnɛ be crosslink density ƒe ʋuʋudedi si le ɖaɖɛ dzi ɖena kpɔtɔna tso anyigba dzi yia eme.