Nkan yii n ṣalaye bii apẹrẹ igbekalẹ microporous ti Teflon breathable (PTFE) teepu iwọn otutu iwọn otutu ṣe iwọntunwọnsi permeability afẹfẹ pẹlu idabobo ati awọn ohun-ini ti kii-stick. Rogbodiyan mojuto: permeability afẹfẹ nilo awọn pores ṣiṣi, lakoko ti idabobo nbeere iwuwo ati ti kii-igi nilo awọn aaye didan. Awọn ilana apẹrẹ ti iwọntunwọnsi: iṣakoso iwọn ila opin pore apapọ (0.1-2μm, apere <0.5μm) lati ṣe idiwọ ilọwu yo ati ṣetọju foliteji didenukole; iṣakoso porosity ni 50-70% (≈60% ti o dara julọ) aṣeyọri Gurley 20-100s / 100cc ati agbara dielectric ≥2kV fun fiimu 0.13mm; gba eto pore nẹtiwọki 3D giga-tortuosity (τ≈2.5-4) lati dinku ni taara-nipasẹ awọn ikanni idasilẹ; òrùka aibaramu gradient pore be pẹlu ipon dada ara Layer (1-5μm) fun ti kii-stick / idabobo ati la kọja inu ilohunsoke fun breathability; Waye Super-oleophobic / hydrophobic dada lẹhin-itọju lai pore blockage.

Nkan yii ṣafihan awọn anfani ti aṣọ otutu otutu PTFE bi media àlẹmọ iwọn otutu giga. Awọn agbara bọtini mẹfa: Idaabobo iwọn otutu ti o tayọ (itẹsiwaju 260 ° C, tente ~ 300 ° C), ti o pọju PPS (190 ° C) ati aramid (200 ° C); Inertness kemikali ti o ga julọ lodi si awọn acids, alkalis, awọn olomi ati awọn oxidants, hydrolysis-sooro, ti njade aramid ati P84 ni gaasi flue corrosive; Iṣẹ ṣiṣe mimọ eruku ti o ga julọ pẹlu agbara dada kekere-kekere ti n mu irọrun yiyọ akara oyinbo eruku ati idaduro titẹ kekere silẹ; Imudara sisẹ ti o dara julọ pẹlu awọn iwọn pore 0.1-3μm yiya lori 99.99% ti awọn patikulu PM2.5; Ti kii-flammability pẹlu LOI loke 95%, pẹlu awọn aṣayan egboogi-aimi ti o wa; Agbara ẹrọ ti o ga lati imuduro fiberglass, pẹlu media fiber PTFE mimọ ti n funni ni irọrun ati> igbesi aye iṣẹ ọdun 4. Ṣe afiwera si PPS, aramid, Nomex, P84 ati media àlẹmọ fiberglass kọja iwọn otutu, resistance kemikali, resistance hydrolysis ati iṣẹ mimọ.

Nkan yii n pese awọn solusan eleto fun idilọwọ iyoku alemora ati ẹjẹ alemora nigba lilo teepu iwọn otutu giga PTFE lati daabobo awọn ika ọwọ goolu PCB lakoko apejọ SMT. Itupalẹ okunfa gbongbo: iyoku waye lati ikuna iṣọpọ tabi gbigbe interfacial; ẹjẹ waye lati inu iki iki ati aponsedanu alemora labẹ ooru atunsan. Ojutu mojuto jẹ yiyan teepu to dara: silikoni PSA pẹlu tente oke igba kukuru ≥300°C, lemọlemọfún ≥260°C, sisanra lapapọ 0.08-0.13mm pẹlu awọn fẹlẹfẹlẹ alemora giga tinrin, ati iwe-ẹri egboogi-bleed/ iyoku-ọfẹ. Iṣakoso ilana-igbesẹ mẹfa: mimọ lamination pẹlu IPA; odo-ẹdọfu lamination pẹlu ni kikun air sisilo; profaili iwọn otutu atunsan iṣapeye pẹlu alapapo onírẹlẹ (<2°C/s); peeling tutu ni isalẹ 50 ° C ni igun 180 °; sisẹ lẹsẹkẹsẹ laarin awọn wakati 24 ati lilo ẹyọkan; mimu ikuna pẹlu IPA wiping ati 40-50x magnifier ayewo. Fun awọn PCB ti o ni apa meji, rọpo pẹlu teepu tuntun ṣaaju ṣiṣe sisẹ ẹgbẹ keji.

Nkan yii n pese itọnisọna eto lori idilọwọ awọn wrinkles lori asọ otutu otutu PTFE lakoko sisọ. Wrinkles ti wa ni taa ṣẹlẹ nipasẹ uneven gbona isunki ati aisedede wahala. Awọn ojutu bo iṣan-iṣẹ ni kikun: iṣakoso sobusitireti ohun elo aise (pipe dewaxing / eto ooru lati yọkuro aapọn inu); impregnation ati gbigbe (ọpọ tinrin ti a bo, onírẹlẹ otutu ite, ti nṣiṣe lọwọ rollers); Iṣakoso ileru sintering (1-3% overfeed fun igbanilaaye isunki gbigbona, iṣakoso micro-ẹdọfu ti o ni pipade, isokan otutu otutu laarin ± 5 ° C, igbi ti iṣaju-itutu-itutu gradient, awọn ileru afẹfẹ-flotation bi ojutu ti o dara julọ, awọn rollers ti ntan kaakiri); itutu agbaiye ati eto (itutu agba lọra diẹdiẹ, ṣetọju itankale titi di isalẹ 100 ° C, itutu agbaiye ni kikun ṣaaju yika); ibojuwo ori ayelujara pẹlu ayewo ina to lagbara ati ọlọjẹ infurarẹẹdi.

Nkan yii ṣe itupalẹ bii iyanrin tabi itọju ipari matt ṣe ni ipa lori eto dada ti asọ iwọn otutu giga PTFE. Awọn ayipada waye ni awọn iwọn mẹta: Mofoloji airi yipada lati didan digi-bi si sojurigindin gully ti o ni inira pẹlu awọn iye Ra / rz ti o pọ si, ṣiṣẹda awọn ẹya ara ẹrọ anchoring 3D fun isọpọ atẹle. Iduroṣinṣin ibora koju awọn ewu: tinrin Layer PTFE, ifihan agbara ti sobusitireti fiberglass (nfa isonu ti ohun-ini ti kii ṣe igi, ilaluja ọrinrin, ati agbara ẹrọ ti o dinku), pẹlu awọn microcracks ati iran idoti.

Nkan yii ṣafihan ilana ipilẹ ti o pe fun impregnating fiberglass fabric pẹlu emulsion PTFE. Awọn igbesẹ bọtini meje: ① Pretreatment (dewaxing/desizing) ni 350-400°C lati yọ awọn aṣoju wiwọn aṣọ; ② Ilana Emulsion pẹlu 40-55% akoonu ti o lagbara ati awọn surfactants fun imudara wetting; ③ Impregnation nipasẹ ọna dip-squeeze tabi ibora abẹfẹlẹ dokita; ④ Gbigbe ni 100-150 ° C lati rọra yọ omi kuro ki o si ṣe fiimu PTFE ti o gbẹ; ⑤ Sintering ni 360-390 ° C (titi di 400 ° C) lati yo awọn patikulu PTFE sinu fiimu ti o tẹsiwaju; ⑥ Multi-cycle impregnation-gbígbẹ-sintering tun 2-4 igba lati de ọdọ afojusun sisanra ati resini akoonu (45-65%); ⑦ Itọju lẹhin-itọju pẹlu itọju corona, gige eti, yikaka ati ayewo didara. Awọn aaye iṣakoso koko: dewaxing pipe, rirọ emulsion ni kikun, gbigbe mimu mimu, iwọn otutu sintering deede, ati iwuwo bora deede. Awọn ọja sin ga-igbohunsafẹfẹ Ejò-agbada laminates, ga-otutu conveyor beliti ati ayaworan awọn ohun elo awo.

Nkan yii ni wiwa awọn afihan iṣẹ ṣiṣe pataki fun teepu iwọn otutu giga PTFE ti a lo ninu ibora igbale, itọju ooru igbale ati awọn agbegbe ti o jọra. Awọn ibeere bọtini yato pupọ si lilo oju aye: ijade jade jẹ pataki julọ (TML≤1%, CVCM≤0.1%; Aerospace/optical grades nilo TML≤0.5%, CVCM≤0.01%); otutu resistance gbọdọ wa ni wadi fun awọn mejeeji PTFE sobusitireti (260°C) ati alemora Layer; PSA silikoni kekere ti njade ni mimọ ni a nilo lati ṣe idiwọ ibajẹ siloxane; agbara imudani iwọn otutu ti o ga julọ ṣe idilọwọ jijoko ati gbigbe eti; mimọ nbeere ko si sisọ okun ati akoonu ionic kekere; teepu anti-aimi (resissitivity dada 10⁶-10⁹ Ω/sq) ṣe idiwọ ibajẹ ESD; resistance pilasima gbọdọ jẹ iṣiro fun sputtering / PECVD awọn ilana; isunki gbona ni isalẹ 2% ṣe idaniloju konge masking.

Nkan yii ṣafihan awọn nkan ti o ni nkan ti o ni nkan ti ara ti PTFE aṣọ otutu otutu le duro. Aṣọ gilaasi ti a bo PTFE ṣe afihan ailagbara kemikali alailẹgbẹ, ni ilodisi gbogbo awọn olomi Organic ti o wọpọ labẹ awọn ipo iṣẹ deede laisi itusilẹ, wiwu tabi iṣesi kemikali. Awọn isọri ifarada pẹlu: alcohols (methanol, ethanol, isopropanol), ketones (acetone, MEK, cyclohexanone), esters (ethyl acetate, butyl acetate), hydrocarbons (petirolu, toluene, xylene, hexane), hydrocarbons halogenated (dichloromethane, chloroformyl, Organic acid tetras, chloroformin, chloroformyl, tetras acid tetras, chloride acid, carbon acid, chloride acid, chloride acid, carbon acid). (glacial acetic acid, formic acid), amines ati amides (triethylamine, DMF), phenols, ati awọn miiran bi erogba disulfide, pyridine, epo silikoni ati omi bibajẹ.

Nkan yii ni wiwa awọn ibeere oṣuwọn itutu agbaiye lakoko PTFE asọ ti o ni iwọn otutu giga. Lẹhin ti sisọ ni 380-400 ° C, aṣọ naa gbọdọ yara kọja ni agbegbe 310-315C crystallization-sensitive. Oṣuwọn itutu agbaiye ti a ṣe iṣeduro jẹ o kere ju 30-50 ° C / min (aṣọ tinrin le ṣaṣeyọri 100-200 ° C / min nipasẹ itutu afẹfẹ). Itutu agbaiye (quenching) n ṣe agbejade crystallinity kekere (45-50%), ti nso asọ, awọn aṣọ wiwu lile pẹlu awọn ipele didan, adhesion ti o lagbara, iṣẹ ṣiṣe ti kii ṣe igi ti o dara julọ, ati resistance si delamination ati fifọ. Itutu agbaiye ti o lọra (itutu agbaiye ileru) awọn abajade ni kristalinity giga (60-70%), ti o nfa lile, awọn aṣọ wiwọ ti o ni itara si isunki, peeling ati microcracks.

Nkan yii ṣe afiwe iwọn otutu-yara ati iwọn otutu otutu otutu ti silikoni ti o ni ifarabalẹ alemora fun teepu PTFE. Iwọn otutu ti o ga julọ (120-180 ° C) ṣẹda awọn nẹtiwọọki isopopo ipon pẹlu agbara isọdọkan to lagbara, idilọwọ iyoku alemora lẹhin peeli. O ṣe agbekalẹ awọn iwe ifunmọ kemikali pẹlu awọn sobusitireti PTFE nipasẹ iṣakojọpọ alakoko, imukuro awọn eewu delamination. Iwọn otutu otutu ti o ga julọ tun yọkuro awọn iyipada kekere-molekula ṣaaju ki o to ifijiṣẹ, idilọwọ bubbling ati silikoni epo konti lakoko alapapo akọkọ.