Itheyiphu yokushisa ephezulu ye-PTFE yezinga lezokwelapha ihlanganisa i-biocompatible PTFE substrate ne-adhesive abicah elashwe ngeplatinamu. Izici ezibalulekile: I-ISO 10993 iyahambisana (ayikho i-cytotoxicity, ukuzwela, noma ukucasuka), imelana nokuvala inzalo okuphindaphindiwe (umusi/EO/gamma), ukumelana nokushisa okungu-260°C. Izinyathelo zokuqapha ezibucayi: ungeqi ku-260°C (intuthu enobuthi engaphezu kuka-300°C), i-gamma irradiation ingase ibangele i-embrittlement, iqinisekise izindlela zokuvala inzalo, futhi icele imibhalo yokuthobela ngokugcwele (imibiko ye-ISO 10993, i-MSDS, idatha yokuguga). Hhayi okwegazi eliqondile noma ukusetshenziswa kokufakelwa ngaphandle kokuthi kuqinisekiswe ngokuqondile.

Ukusebenziseka kabusha kwetheyiphu ye-PTFE kuncike ezicini ezine: ukwakheka kokunamathelayo (ukuminyana okuphezulu kwe-crosslink, ukufuduka kwe-silicone ephansi, isakhiwo se-microphase se-tack ekwazi ukubekeka kabusha), i-substrate anchoring (ukwenza kusebenze kobuso + i-primer ukuvimbela ukudluliswa okunamathelayo okugcwele), ukunamathela okungemuva (ukukhulula ungqimba ukuze kuvikelwe okunamathelayo ngesikhathi sokuqaqa), nokuphatha okufanele (indlela yokunamathisela ecwebileyo, indawo yokunamathisela ecwebileyo, ukugwema okulungile). Izinamatheliso eziguquliwe eziwasheka ngamanzi zingalulama > 90% itheki ngemuva kokuhlanza.

Itheyiphu ye-PTFE yobubanzi obubanzi bezinga lokushisa idinga i-silicone PSA egcina ukunamathela ukusuka -70°C kuya ku-260°C. Izakhi eziyinhloko zokuklama: ungqimba lwenguquko olunama-primer-anchored (lugwema i-delamination), i-sea-island microstructure (i-MQ resin Islands + i-polysiloxane isigaba esiqhubekayo), i-gradient crosslinking (ungqimba olungaphakathi olunomthamo omkhulu wokumelana nokukhasa, ungqimba lwangaphandle olunobukhulu obuphansi bokudonswa kwezinga lokushisa eliphansi), kanye nezigcwali ezizinzile ze-oxid oxide (i-oxid oxide). Amasegimenti e-phenyl-modified siloxane acindezela i-crystallization yezinga lokushisa eliphansi, evumela ukuguquguquka okungaphansi -100°C.

Isakhiwo sobuso esisikiwe se-PTFE itheyiphu yokushisa okuphezulu sithinta ngokuqondile ukunamathela okunamathelayo nokuphakamisa unqenqema ngesikhathi sokufaka isicelo. Ukusika okungalungile (izindwani ezibuthuntu, i-engeli engafanele) kudala imicu yeglue, kwenze kube mncane ungqimba olunamathelayo olusemaphethelweni, futhi kuveza obala ama-fiberglass burrs - okuholela ekuphumeni, ekuhlanganisweni okubuthakathaka, nasekuphakamiseni ngaphansi kokushisa noma ukushuba. Ubuso obungajwayelekile bokuphela (okunamagagasi, obuphumela ngaphandle) bubangela ukusakazwa kwengcindezi engalingani, ukushayela okunamathelayo kukhase ngesikhathi sokulondoloza. Ubuso obufanele ekugcineni bushelelezi, buyashesha, futhi abunamonakalo - busebenza njengesivalo esikhiya okunamathelayo futhi siqinisekise ukubopha okugcwele emaphethelweni.

Ngesikhathi sokumbozwa kwetheyiphu ye-PTFE, izinga le-solvent volatilization ye-adhesive ezwela ukucindezela kwe-silicone iyipharamitha yenqubo ebalulekile. Kushesha kakhulu → ukuhlikihlwa kwesikhumba, ukungaleveli kahle, amaphinifa (i-solvent evalelekile), nama-craters (ukujiya noma okubangelwa ukungcola). Iyanensa kakhulu → ukuwohloka, imiphetho ewugqinsi, kanye nokumanzisa ku-PTFE yamandla aphansi. Isu elilungile: ukuvuthwa kancane kwasekuqaleni kokulinganisa nokuphunyuka kwebhamuza, bese kusheshiswa ukomiswa ukuze kubunjwe. Sebenzisa izincibilikisi ezixubile (i-toluene/xylene + ukomisa ngokushesha) nezinga lokushisa likahhavini we-gradient (eliphansi→elimaphakathi→phezulu).

Itheyiphu ye-PTFE yokushisa okuphezulu inokumelana nesifutho sikasawoti esihle kakhulu, kodwa amaphuzu abuthakathaka ungqimba olunamathelayo kanye nemiphetho ye-fiberglass substrate. Izindlela zokuhlola: Ukuhlolwa kwe-1000h neutral salt spray (NSS), ukulinganisa ukugcinwa kwamandla e-peel (≥80% edingekayo), ukukhubazeka okubukwayo (ukuphakamisa, amabhamuza), kanye nokugqwala kwe-substrate yensimbi. Ezindaweni zasolwandle nezinosawoti omningi: sebenzisa i-silicone PSA (hhayi i-acrylic), i-PTFE substrate efakwe ngokugcwele, vala imiphetho nge-sealant emelana nesimo sezulu, bese usebenzisa i-primer ezindaweni zensimbi.

Itheyiphu ye-PTFE yokushisa okuphezulu ilahlekelwa ukunamathela ngemva kokusetshenziswa okuphindaphindiwe ngenxa yokungcoliswa kwendawo (uthuli, uwoyela we-silicone), ukwehluleka kokunamathela okunamathelayo (insalela), noma ukubopha okubuthakathaka kwe-substrate. Izisombululo: i-silicone ye-high-crosslink i-PSA (ukufuduka okuphansi, i-balance tack/amandla okubamba), ukwelashwa kwe-primer ku-PTFE substrate, ukusekelwa kwe-fiberglass ecinene, nokubamba okufanele (indawo ehlanzekile, ikhasi elipholile, i-engeli engu-180°). Ukuhlolwa komthamo kuqinisekisa ukuthuthuka.

Itheyiphu ye-PTFE yokushisa ephezulu egcinwe ngaphansi kwezimo ezishiwo (10-25°C, 40-70% RH, kude ne-UV/ingcindezi enkulu) ineshalofu elijwayelekile lezinyanga ezingu-3-6 (amabanga eprimiyamu afika ezinyangeni eziyi-12). Imikhawulo eyinhloko yokuwohloka: amandla ekhasi akumele ehle ngaphansi kuka-70% yenani lokuqala; akukho zinsalela zokunamathela ngemva kokususwa kwezinga lokushisa eliphezulu; akukho carbonization noma ukuqhekeka ezingeni lokushisa elilinganiselwe. Ukuhlola okusheshayo: umuzwa wokuzikhulula mathupha, ukuhlolwa kwensalela engu-260°C, nokuhlolwa kokuncipha kwe-lamination.

Itheyiphu ye-PTFE egoqiwe ingathuthukisa ukunamathela kwe-interlayer (ukuvimbela) kanye nokudlulisa okunamathelayo ngesikhathi sokugcina isikhathi eside. Izimbangela: inkumbulo enwebekayo yefilimu ye-PTFE kanye ne-silicone PSA ihamba ngaphansi kwengcindezi/ukushisa. Ukuvimbela: i-gradient winding tension (impintshana yangaphandle, ukuxega kwangaphakathi) ngesikhathi sokukhiqiza, kanye nokukhulula okokunamathela ohlangothini olunganamatheli. Gcina ku -15°C kuya ku-40°C, 30-70% RH, uvundlile kumarack, zungezisa amaroli ngekota. Ukuze uthole amamaki anamathelayo aminyene, engeza iphepha lokukhulula phakathi kwezendlalelo.

Amateyipu e-PTFE okushisa okuphezulu agcinwe efomini lokugoqa angahlushwa ukunamathela kwe-interlayer (ukuvinjwa) kanye nokudluliselwa okunamathelayo ohlangothini olunganamathele. Imbangela: PTFE ifilimu inkumbulo nokunwebeka futhi abicah PSA creep ngaphansi kwengcindezi nokushisa. Isixazululo: I-gradient winding tension - iqinile ezingqimbeni ezingaphandle, iyaxega ezingqimbeni zangaphakathi - kusetshenziswa isilawuli sokuqina sokuqina kwe-loop. Ihambisana ne-coating yokukhishwa, isitoreji esifanele (15-40°C, 30-70% RH), ukubekwa okuvundlile, nokuzungezisa kwekota.