Isiponji se-silicone esinegwebu singesinye sezinto ezisetshenziswa kakhulu zokuvala, zokumanzisa kanye nezisetshenziswa ezishisayo ku-HVAC yesimanje, okokusebenza kwezimboni, ukukhiqiza ngogesi kanye nezimboni ezintsha zamandla. Ngokwezinqubo ezihlukene zokukhiqiza i-filler, ihlukaniswe ikakhulukazi izigaba ezimbili eziyinhloko: i-silicone ye-foam evuthayo kanye ne-silicone yegwebu elincibilikile. Nakuba kokubili kungokwezinto ezibonakalayo zegwebu le-silicone futhi behlanganyela izici eziyisisekelo ze-silicone, umehluko obalulekile wobuciko bempahla eluhlaza unquma izikhala zabo ezinkulu ezimpahleni ezibonakalayo, ukuqina, ukusebenza kwemvelo kanye nezimo zohlelo lokusebenza. Lesi sihloko sixazulula ngokuhlelekile ukufana kanye nomehluko obalulekile phakathi kwezinto ezimbili, ihlinzeka ngesisekelo sokukhetha izinto ezisebenzayo kubaklami bezimboni, abakhiqizi bemishini kanye nabathengi bobunjiniyela.
1. Ukufana Okuyisisekelo Phakathi Kwe-Silicone Yegwebu Evuthayo kanye Namanzi
Okubalulekile, kokubili i-silicone yegwebu elifuthayo kanye ne-precipitated foam silicone kuyizinto ezinwebekayo zesipontshi ezimbozekile ezakhiwe ngokuxuba isisekelo senjoloba ye-silicone, ukwengeza izinto ezibangela amagwebu nezithasiselo ezisizayo, kanye nokuvuvukala okuphezulu{0}}kwezinga lokushisa nokubumba okunamagwebu. Bazuza njengefa izinzuzo ezibalulekile zezinto ze-organic silicone futhi banezimfanelo eziyisisekelo ezingaguquki ezimweni zezimboni. Okokuqala, zombili izinto ezisetshenziswayo zinokumelana kwezinga lokushisa eliphezulu kakhulu neliphansi, zigcina ngokuzinzile ukusebenza okunwebekayo ebangeni lokushisa elivamile -elingu-50℃kuya ku-200℃, futhi ngeke libe lukhuni, liqhekeke noma liwoleke ngaphansi kwezimo zokusebenza ezivamile ezishintshana nezimo zokusebenza. Okwesibili, bobabili banokuguquguquka okuhle, ukuqina kwendawo kanye nokusebenza kokumunca ukushaqeka, okungagcwalisa ngempumelelo izikhala zemishini, futhi badlale indima yokuvala umoya, ukuvimbela uthuli, ukunciphisa ukudlidliza kanye nokunciphisa umsindo. Okwesithathu, kokubili kusebenzisa izakhiwo ezizimele ezivaliwe{{8}zeseli noma{9}}ezivaliwe{10}}zegwebu lamaseli, ezinekhono elithile elingangenwa amanzi kanye nomswakama, futhi zingagwema ukungena komhwamuko wamanzi nokunqwabelana kwamanzi ajiyile ezindaweni zokungenisa umoya ezivamile nasezindaweni zokuvala izisetshenziswa. Ngaphezu kwalokho, zombili izinto ezisetshenziswayo zisekela izindlela zokucubungula ezijulile ezifana nokubunjwa kwe-extrusion, ukusika ukufa kanye ne-adhesive lamination lamination, futhi kungenziwa ngezifiso emicu ehlukahlukene, ama-gaskets namashidi ukuze kuhlangatshezwane nezidingo ezihlukene zokufanisa zemishini yemishini kanye nokufakwa kobunjiniyela.
2. Umehluko Obalulekile Phakathi Kwe-Silicone Yegwebu Evuthayo kanye Namanzi
Umehluko oyinhloko phakathi kwalezi zinto ezimbili usuka ku-reinforcing filler-i-silica evuthayo kanye ne-silica eshisayo, elungiswa izinqubo zokukhiqiza ezihluke ngokuphelele, okuholela ekwehlukeni okusobala kwesakhiwo esincane esibonakalayo, izici zemishini, ukumelana nokuguga kanye nemikhawulo yokusetshenziswa, kanye nokwenza ukuma okuphezulu{1}}kokuphakeme nokujwayelekile okujwayelekile emakethe yezimboni ngokulandelanayo.
Mayelana nobuciko bempahla eluhlaza kanye ne-microstructure, i-silicone ye-foam ene-fumed isebenzisa{0}}i-purity nano fumed silica ephezulu ehlanganiswe{1}}yigesi yezinga lokushisa eliphezulu{2}}isigaba sokusha. Izinhlayiya zokugcwalisa ziningi kakhulu-zinhle kakhulu, zilingana ngosayizi futhi zimsulwa kakhulu, ezingakha uhlaka oluminyene futhi oluzinzile{5} oluxhumanisa nama-molecule erabha ye-silicone. Ngemuva kokukhipha amagwebu, izimbotshana zamaseli zangaphakathi zincane, zifana futhi ziminyene, azinawo ama-pores amakhulu noma ama-pore. Ngokuphambene, i-silicone yegwebu elinemvula ithatha i-silica enemvula elungiselelwe ukusabela kwemvula yamakhemikhali. Izinhlayiya zokugcwalisa zimaholoholo, zinokusatshalaliswa kosayizi wezinhlayiyana ezingalingani futhi zilandelela izinsalela zokungcola. Izinto ezinegwebu zinezimbotshana zamaseli zangaphakathi ezingajwayelekile, usayizi wezimbotshana ezingalingani kanye nezakhiwo zasendaweni ezigqagqene, okuholela ekuhlanganeni kwempahla okuxekethile.
Ngokusebenza komshini nokuqina, i-silicone ye-foam evuthayo inokumelana okuvelele okuqinile, ukumelana nezinyembezi nokusebenza kokululama okunwebekayo. Ubude bayo ngesikhathi sekhefu buphakeme kakhulu kunaleyo yezinto eziwa kakhulu, futhi ngeke iphenduke ibe mhlophe noma iqhekeke ngemva kokugoba okuphindaphindiwe nokukhishwa. Okubaluleke kakhulu, ine-deformation engapheli yokucindezelwa okuphansi kakhulu, engagcina ukunwebeka okuzinzile kokubeka uphawu isikhathi eside ngaphansi kwezimo zokusebenza zokucindezelwa okuqhubekayo kanye nokudlidliza, ukugwema ukuvuza komoya kanye nokwehluleka okubangelwa ukuncipha kokunwebeka. I-silicone yegwebu encibilikile inamandla ajwayelekile emishini; ijwayele ukuba mhlophe ngesikhathi sokwelula futhi kulula ukuyidwengula ngaphansi kwamandla angaphandle. Ngemuva kokuminyanisa-kwesikhathi eside, ukunwebeka kuyashesha, izinga lokucindezelwa unomphela lokuminyanisa liphezulu, futhi igebe lokuvala libonakala kalula ngemva kokukhathala kwezinto, okuholela ekwehleni kokusebenza kokuvala kukonke kwezisetshenziswa.
Mayelana nokuvikelwa kwemvelo, ukumelana nokuguga nokusebenza kokuphepha, i-silicone yegwebu elifuthayo yenziwe{0}}ngezinto ezingavuthiwe ezihlanzekile, ezinokuqukethwe okuguquguqukayo okuphansi, akukho sulphur futhi akukho phunga elingavamile. Ingakwazi ukuhlangabezana namazinga aqinile okuvikela imvelo kanye namazinga okuhlanzwa njenge-REACH ne-FDA, futhi ingafinyelela izinga le-UL94 V0 eliphezulu le-flame retardant. Iyakwazi ukumelana nokuguga okuqinile kwezinga lokushisa eliphezulu, ukuguguleka kwe-ultraviolet nokuswakama kwemvelo, futhi ingagcina izakhiwo ezinzile iminyaka engu-5-8 iminyaka{7}}yezinga lokushisa eliphezulu{9}}lesikhathi eside{9}}kanye nezindawo zokusebenza ezishintshayo ezibandayo nezishisayo. I-silicone yegwebu elinciphile ilandelela imvula eguquguqukayo, iphunga elithile enqubweni yokukhiqiza, futhi ayikwazi ukuhlangabezana nokuhlanzwa kanye{11}nokudla namazinga okuvikela imvelo. Ibanga le-flame retardant ngokuvamile liyi-HB, elinokumelana{13}}nezinga lokushisa eliphansi lokuguga. Ijwayele ukuba phuzi, ibe lukhuni futhi iqhekeke ngemva{14}}kumsebenzi wesikhathi eside wezinga lokushisa eliphezulu, futhi impilo yesevisi iyiminyaka engu-2-3 kuphela.
Ngokwezimo zohlelo lokusebenza kanye nokuma kwezindleko, i-fumed foam silicone iyinto ephezulu-yokuvalwa kwemboni, ikakhulukazi esetshenziswa{1}}ezimeni ezivamile ezifana nezinhlelo ze-HVAC ze-air conditioning emaphakathi, okokusebenza komoya wokuhlanza imithi, okokusebenza kwe-elekthronikhi okunembayo, okokusebenza kwebhethri lamandla amasha kanye nezindawo zokuhamba zikaloliwe. Ilungele izimo zokusebenza ezidinga{3}}ukuzinza kokuqina komoya isikhathi eside, alikho iphunga elingavamile, ukuncipha komlilo ophakeme kanye nokuvuleka nokuvalwa njalo kwezisetshenziswa. I-silicone yegwebu eshisiwe iyindleko-into evamile esebenzayo, esetshenziswa kakhulu ezimweni ezifunwa umphakathi-ezisezingeni eliphansi{7}}njengeziphephetha-moya zasendlini, amasistimu omoya ohlanzekile avamile, amafeni amancane okungenisa umoya kanye nokugcwaliswa kothuli okuvamile{8}. Ifanele izimo zokusebenza ezivamile ezinezidingo eziphansi zemvelo, akukho{10}}ukusebenza okuqhubekayo kwesikhathi eside kanye nemijikelezo evamile yokushintsha izinto.
3. Isifinyezo kanye Nesiphakamiso Sokukhetha Okubalulekile
Ukufingqa, i-silicone yegwebu elivuthayo kanye ne-silicone yegwebu eshisiwe kuyahambisana nezici ze-silicone eziyisisekelo kanye nokuvumelana nezimo, kodwa zakha ukuthambeka kokusebenza okucacile ngenxa yezinqubo ezihlukene zokugcwalisa. I-silicone yegwebu elinciphile igxila ekusebenzeni kwezindleko futhi ihlangabezana nezidingo eziyisisekelo zokuvala nokuthobisa zempahla yemboni esetshenziswa umphakathi kanye{1}}esezingeni eliphansi, okuwumsebenzi okhethwayo wamaphrojekthi{2}ajwayelekile alawulwayo. I-fumed foam silicone incike esakhiweni sayo esiminyene, ukunwebeka okuzinzile, ukumelana nokuguga okuhle kakhulu nokuphepha okuphezulu kwendawo ezungezile, futhi iyindlela evamile yokufanisa{4}}nempilo ende-yempilo ende{6}}nokwesekwa okuphezulu{6}}okusezingeni eliphezulu nokunemba kwemishini. Ekukhetheni izinto ezibonakalayo, kuyadingeka ukwahlulela ngokugcwele ngokwendawo yokusebenza kwemishini, izindinganiso zokuphepha, izidingo zempilo yesevisi kanye nesabelomali sephrojekthi ukuze ukhethe ofaneleka kakhulu we-foam silicone sealing material.