Kutentha kwakukulu Tepi ya PTFE iyenera kulumikizana modalirika pa -70 ° C (kapena kutsika) ndikukhalabe pakuwonekera mosalekeza pa 200-260 ° C - kutalika kwa 300 ° C. Izi zimafuna dongosolo lomatira lomwe limakhalabe losinthika popanda kulephera kogwirizana kapena kulumikizana pakati pa nkhope monyanyira.
Zomatirazo zimakhala zomatira zapadera za silicone (PSA) zokutira pamakanema osinthidwa a PTFE kapena nsalu ya PTFE-impregnated fiberglass. Chinsinsi chakuchita bwino pazenera lalitali chotere chagona pakupanga netiweki yosinthika - kapangidwe kamene kamayenderana ndi kunyowa kocheperako, kukana kutentha kwambiri, komanso kulekerera kutenthedwa kwa kutentha.
Aokai PTFE yapanga matepi a PTFE otentha kwambiri pogwiritsa ntchito mfundo zomwe zafotokozedwa pansipa. Nkhaniyi ikufotokoza zinthu zinayi zazikuluzikulu za kapangidwe kake: mawonekedwe osinthira, ma sea-island biphasic microstructure, gradient crosslinking, ndi zodzaza ndi kutentha zokhazikika.
Kusintha Kwagawo Lapakati Pakati pa Gawo Lapansi ndi Zomatira
1. Vuto lalikulu - PTFE pamwamba mphamvu
PTFE imakhala ndi mphamvu zotsika kwambiri (18-20 dynes/cm). Kupaka zomatira mwachindunji kumakonda kung'ambika panthawi yanjinga yotentha chifukwa chosagwirizana ndi ma coefficients owonjezera amafuta - PTFE imakulitsa 30-40x kuposa fiberglass.
2. Kutsegula kwapamwamba ndi kuyimitsa koyambira
Kuti athetse izi, PTFE pamwamba amadutsa mankhwala etching ndi sodium-naphthalene complexes kapena mankhwala a m'madzi a m'magazi kuti adziwe C = C zomangira ziwiri ndi magulu a polar okhala ndi mpweya. Kenako, silikoni yowonda kwambiri yodzipereka kwambiri (monga vinyl-containing silane coupling agent) imayikidwa kuti ipange 'mamolekyu mlatho' polumikizana ndi mankhwala.
3. Kupsyinjika-buffering interlayer
M'mapangidwe ena, otsika-modulus, apamwamba-ductility zotanuka wapakatikati wosanjikiza (gel-ngati silikoni yokhala ndi zigawo zosinthika) amalowetsedwa pakati pa wosanjikiza woyendetsedwa ndi wosanjikiza waukulu. Izi zimatenga kupsinjika kwapakati pamawonekedwe obwera chifukwa cha kusinthasintha kwa kutentha ndikuletsa kukweza m'mphepete mwa zomatira.
Sea-Island Biphasic Microstructure Regulation
Chomata chachikulu chomata ndi kachitidwe kakale ka PSA kopangidwa ndi MQ silicone resin (gawo lobalalika pachilumba) ndi polysiloxane yolemera kwambiri ya mamolekyulu (gawo lanyanja lopitilira).
1. MQ silicone resin - gawo la chilumba cholimba
Amapereka mgwirizano, mphamvu yogwira, komanso kukana kutentha kwapamwamba. Kuwongolera molondola kwake kwa M / Q molar chiŵerengero (nthawi zambiri 0.6-0.9) ndi kufalikira kwa tinthu tating'onoting'ono kumatsimikizira kuyika yunifolomu mkati mwa gawo lopitirira kupanga malo ophatikizika.
2. Polysiloxane yopitirira gawo - gawo la nyanja yofewa
Amapereka ma tack ofulumira, kunyowa pang'ono, komanso kusinthasintha. mphira wolemera kwambiri wa methyl vinyl silikoni kapena mphira wa silikoni wa methyl phenyl vinyl amasankhidwa nthawi zambiri.
3. Kukhathamiritsa kwapadera kwa kutentha kwakukulu
Gawo laling'ono la siloxane lapamwamba kwambiri la phenyl-content limaphatikizidwa. Magulu a Phenyl amapondereza kutsika kwa crystallization ya polydimethylsiloxane, kutsitsa kutentha kwa zomatira pansi -100 ° C. Pakadali pano, magulu a phenyl amathandizira kukana kutenthedwa kwamafuta-oxidative pa kutentha kwakukulu, zomwe zimapangitsa kuti gawo lanyanja losalekeza likhalebe lolimba kwambiri pawindo lalikulu la kutentha.
Multi-Layer kapena Gradient Crosslinking Design for Thermal Shock Resistance
Njira yokutira yokhala ndi zigawo ziwiri imatengedwa kuti igwirizane ndi kutentha kwapamwamba komanso kutsika kwa kutentha:
Kachulukidwe kakang'ono kwambiri ka ma crosslink okhala ndi maunyolo oyenda kwambiri a ma cell, kuwonetsetsa kuti kunyowetsa mwachangu kumamatira pamatenthedwe otsika komanso kokwanira koyambira.
Kapenanso, kupendekera kosalekeza kwa kachulukidwe ka crosslink kuchokera mkati mpaka kunja kumapangidwa mkati mwa gawo limodzi kudzera pamachiritso, kuphatikiza mosasunthika madera olimba komanso osinthika.
Aokai PTFE imagwiritsa ntchito ukadaulo wa gradient crosslinking kuti zitsimikizire kuti tepiyo imakhalabe yosinthika pa -70 ° C (yothandizira kuwongolera koyambirira ndi kufananiza) ndikusunga mphamvu yolumikizana pa 260 ° C (kupewa kukwawa ndi zomatira kusamutsa).
Cerium oxide, iron oxide, ndi zina zowononga kwambiri zimalepheretsa kuuma kwa okosijeni kwa maunyolo am'mbali a siloxane komanso kuwonongeka kwa msana pakutentha kwambiri. Ma antioxidants awa amakulitsa moyo wautumiki pa 260 ° C.
Zodzaza zonse zimafunikira kuphatikizika kwapansi kapena chithandizo cha silane kuti apewe kukwera mochulukira kwa modulus ndikuumitsa zomatira pa kutentha kotsika.
Chidule - Network Adaptive Network for Extreme Conditions
Zomatira za matepi a PTFE otalikirapo kutentha kwenikweni ndi platinamu-catalyzed kuwonjezera maukonde olekanitsidwa ndi microphase ophatikizidwa ndi MQ resin chemical anchoring sites and hybrid phenyl long-chain siloxanes. Pogwiritsa ntchito matekinoloje a gradient crosslinking ndi co-crosslinking teknoloji, imagwirizanitsa bwino:
