Ama-sealant amabili e-silicone akhiwe ngezinto zokwakha anamandla amakhulu, ayakwazi ukuthwala imithwalo emikhulu, futhi amelana nokuguga, ukukhathala, nokugqwala, futhi asebenza kahle ngaphakathi kwesikhathi sokuphila esilindelekile. Afaneleka kuma-glue amelana nokubopha kwezingxenye zesakhiwo. Asetshenziswa kakhulu ekubopheni insimbi, izinto zobumba, amapulasitiki, irabha, ukhuni nezinye izinto zohlobo olufanayo noma phakathi kwezinhlobo ezahlukene zezinto, futhi angathatha indawo yezinhlobo zokuxhuma zendabuko njengokushisela, ukugoba kanye nokubhoboza.
I-silicone structural sealant iyinto ebalulekile esetshenziswa ezindongeni zekhethini lengilazi ezifihliwe ngokuphelele noma ezifihlwe kancane. Ngokuxhumanisa amapuleti nezinhlaka zensimbi, ingamelana nemithwalo yomoya kanye nemithwalo yengilazi ezizisindayo, okuhlobene ngqo nokuqina nokuphepha kwezakhiwo zezindonga zekhethini. Enye yezixhumanisi ezibalulekile zokuphepha kwezindonga zekhethini lengilazi.
Kuyisivalo sesakhiwo esine-polysiloxane eqondile njengezinto eziyinhloko zokusetshenziswa. Ngesikhathi senqubo yokwelapha, i-ejenti yokuxhumanisa isabela ne-polymer eyisisekelo ukuze yakhe into enwebekayo enesakhiwo senethiwekhi esinezinhlangothi ezintathu. Ngoba amandla esibopho se-Si-O esakhiweni sama-molecule enjoloba ye-silicone makhulu kakhulu kumabhondi amakhemikhali avamile (izakhiwo ezithile zomzimba nezamakhemikhali ze-Si-O: ubude bebhondi 0.164±0.003nm, amandla okuhlukanisa ukushisa 460.5J/mol. Iphakeme kakhulu kune-C-O358J/mol, C-C304J/mol, Si-C318.2J/mol), uma kuqhathaniswa nezinye izivalo (njenge-polyurethane, i-acrylic, i-polysulfide sealant, njll.), ukumelana ne-UV kanye nokumelana. Amandla okuguga emoyeni aqinile, futhi awakwazi ukugcina imifantu kanye nokuwohloka iminyaka engama-30 ezindaweni ezahlukene zezulu. Inokumelana okungu-±50% ekuguqukeni nasekufudukeni ebangeni elibanzi lokushisa. Kodwa-ke, ngokwanda kokusetshenziswa kwe-silicone structural sealants, kuzovela izinkinga ezahlukahlukene ezisetshenziswayo, njengokuthi: ukuhlanganiswa kwezinhlayiya kanye nokucolwa kwengxenye B, ukuhlukaniswa kanye nokuhlukaniswa kwengxenye B, ukucindezela Ipuleti alikwazi ukucindezelwa phansi noma iglu iguqulwe, isivinini sokukhipha iglue somshini weglue sihamba kancane, iglue yeshidi lovemvane inezinhlayiya, isikhathi sokomisa ubuso sishesha kakhulu noma sihamba kancane, iglue ibonakala ikhuba noma ivulcanization, futhi "iglue yezimbali" ivela ngesikhathi senqubo yokwenza iglue. ", i-colloid ayikwazi ukwelashwa ngokujwayelekile, izandla ezinamathelayo ngemva kwezinsuku ezimbalwa zokulungiswa, ubulukhuni abuvamile ngemva kokulungiswa, kunezimbobo ezinjengenaliti ebusweni bokuhlanganiswa ne-substrate, amabhamuza omoya abanjwe ku-silicone sealant, ukuhlanganiswa okubi ne-substrate, ukungavumelani nezesekeli, njll.
2.Ukuhlaziywa kwemibuzo evame ukubuzwa ye-Two Component Structure silicone adhesive
2.1 Ingxenye ye-B inokuhlanganiswa kwezinhlayiya kanye nokugaywa
Uma kwenzeka ukuhlanganiswa kwezinhlayiya kanye nokugaywa kwengxenye B, kunezizathu ezimbili: esisodwa ukuthi lesi simo senzeke engxenyeni ephezulu ngaphambi kokusetshenziswa, okubangelwa ukuvalwa kabi kwephakheji, futhi i-ejenti yokuxhumanisa noma i-ejenti yokuxhumanisa engxenyeni B iyi-Active compound, esengozini yomswakama emoyeni, leli qoqo kufanele libuyiselwe kumenzi. Esesibili ukuthi umshini uyavalwa ngesikhathi sokusetshenziswa, futhi ukuhlanganiswa kwezinhlayiya kanye nokugaywa kwenzeka lapho umshini uvulwa futhi, okubonisa ukuthi uphawu phakathi kwepuleti lokucindezela lomshini weglue nezinto zerabha alulungile, futhi imishini kufanele ixhumane nayo ukuze kuxazululwe inkinga.
2.2 Ijubane lomshini wokunamathisela lihamba kancane
Uma umkhiqizo usetshenziswa okokuqala, isivinini sokukhipha iglue somshini wokunamathisela sihamba kancane kakhulu ngesikhathi senqubo yokunamathisela. Kunezizathu ezintathu ezingaba khona: ⑴ ingxenye A ayinamanzi anele, ⑵ ipuleti lokucindezela likhulu kakhulu, futhi ⑶ ingcindezi yomthombo womoya ayanele.
Uma kutholakala ukuthi yisizathu sokuqala noma sesithathu, singasixazulula ngokulungisa ingcindezi yesibhamu seglue; uma kutholakala ukuthi yisizathu sesibili, uku-oda ibhereli eline-caliber efanayo kungaxazulula inkinga. Uma ijubane lokukhipha iglue lehla ngesikhathi sokusetshenziswa okuvamile, kungase kube ukuthi i-mixing core kanye nesikrini sesihlungi kuvinjiwe. Uma sekutholakale, imishini idinga ukuhlanzwa ngesikhathi.
2.3 Isikhathi sokuphuma sishesha kakhulu noma sihamba kancane kakhulu
Isikhathi sokuphuka kwesinamathelisi sokwakheka sibhekisela esikhathini esithatha i-colloid ukushintsha kusuka ku-paste iye kumzimba onwebekayo ngemva kokuxuba, futhi ngokuvamile ihlolwa njalo ngemizuzu emi-5. Kunezici ezintathu ezithinta ukoma nokuqiniswa kobuso berabha: (1) ithonya lesilinganiso sezingxenye ze-A ne-B, njll.; (2) izinga lokushisa kanye nomswakama (ithonya lokushisa yilona eliyinhloko); (3) ifomula yomkhiqizo ngokwawo ayinaphutha.
Isixazululo sesizathu (1) ukulungisa isilinganiso. Ukwandisa isilinganiso sengxenye B kunganciphisa isikhathi sokulungisa futhi kwenze ungqimba lokunamathela lube nzima futhi luqhekeke; ngenkathi ukunciphisa isilinganiso se-ejenti yokulungisa kuzokwandisa isikhathi sokulungisa, ungqimba lokunamathela luzoba luthambile, ukuqina kuzothuthukiswa futhi amandla azokwanda.
Ngokuvamile, isilinganiso sevolumu sengxenye A: B singalungiswa phakathi kuka (9 ~ 13:1). Uma isilinganiso sengxenye B siphezulu, isivinini sokuphendula sizoshesha futhi isikhathi sokuphuka sizoba sifushane. Uma ukusabela kushesha kakhulu, isikhathi sokusika nokumisa isibhamu sizothinteka. Uma kuhamba kancane kakhulu, kuzothinta isikhathi sokomisa se-colloid. Isikhathi sokuphuka ngokuvamile silungiswa phakathi kwemizuzu engama-20 nengama-60. Ukusebenza kwe-colloid ngemva kokupholisa kulesi silinganiso kuyafana. Ngaphezu kwalokho, lapho izinga lokushisa lokwakha liphezulu kakhulu noma liphansi kakhulu, singanciphisa noma sandise ngokufanele isilinganiso sengxenye B (i-ejenti yokwelapha), ukuze sifeze inhloso yokulungisa isikhathi sokomisa ubuso kanye nesikhathi sokupholisa se-colloid. Uma kunenkinga ngomkhiqizo ngokwawo, umkhiqizo udinga ukushintshwa.
2.4 "Iglue yezimbali" ivela enkambisweni yokunamathisela
I-gum yezimbali ikhiqizwa ngenxa yokuxubana okungalingani kwama-colloid ezingxenye ze-A/B, futhi ibonakala njengomugqa omhlophe wendawo. Izizathu eziyinhloko yilezi: ⑴Umbhobho wengxenye B yomshini weglue uvaliwe; ⑵Umxube oqinile awuzange uhlanzwe isikhathi eside; ⑶Isikali sikhululekile futhi isivinini sokukhipha iglue asilingani; Kungaxazululwa ngokuhlanza imishini; ngenxa yesizathu (3), udinga ukuhlola isilawuli esilinganayo bese wenza izinguquko ezifanele.
2.5 Ukususwa kwesikhumba noma ukususwa kwe-colloid ngesikhathi senqubo yokwenza iglue
Uma ingcina enezingxenye ezimbili iqiniswa kancane ngesikhathi senqubo yokuxuba, ingcina ekhiqizwa yisibhamu seglue izobonakala ifana nesikhumba noma i-vulcanization. Uma kungekho okungajwayelekile esivinini sokuqina kanye nokuphuma kweglue, kodwa ingcina isaqhekekile noma i-vulcanized, kungenzeka ukuthi imishini ivaliwe isikhathi eside, isibhamu seglue asikahlanzwa noma isibhamu asikahlanzwa kahle, futhi ingcina ehlanganisiwe noma i-vulcanized idinga ukuhlanzwa. Ukwakhiwa ngemva kokuhlanza.
2.6 Kukhona amabhamuza omoya ku-silicone sealant
Ngokuvamile, i-colloid ngokwayo ayinawo amabhamuza omoya, futhi amabhamuza omoya aku-colloid cishe axutshwa nomoya ngesikhathi sokuthutha noma ukwakhiwa, njengokuthi: ⑴I-exhaust ayihlanzwa lapho umgqomo werabha ushintshwa; ⑵Izingxenye zicindezelwa epuletini ngemva kokufakwa emshinini. Azicindezelwa phansi, okuholela ekungcolisweni kwe-defoam okungaphelele. Ngakho-ke, i-foam kufanele isuswe ngokuphelele ngaphambi kokusetshenziswa, futhi umshini weglue kufanele usebenze kahle ngesikhathi sokusetshenziswa ukuqinisekisa ukuvalwa nokuvimbela umoya ukungena.
2.7 Ukunamathela okubi kwi-substrate
I-Sealant ayiyona inhlaka esetshenziswa kabanzi, ngakho-ke ayinakuqinisekiswa ukuthi izonamathelana kahle nazo zonke izinhlayiya ezisetshenziswayo. Ngokuhlukahluka kwezindlela zokwelapha ubuso be-substrate kanye nezinqubo ezintsha, isivinini sokubopha kanye nomphumela wokubopha we-sealants kanye nezinhlayiya nakho kuhlukile.
Kunezinhlobo ezintathu zomonakalo esixhumi esixhumanisayo phakathi kwe-adhesive yesakhiwo kanye ne-substrate. Enye ingumonakalo ohlangene, okungukuthi, amandla ahlangene > amandla ahlangene; enye ingumonakalo we-bond, okungukuthi, amandla ahlangene < amandla ahlangene. Indawo yomonakalo we-junction engaphansi noma elingana no-20% iyafaneleka, kanti indawo yomonakalo we-bond edlula u-20% ayifaneleki; indawo yomonakalo we-bond edlula u-20% iyisenzakalo esingathandeki ekusetshenzisweni okungokoqobo. Kungase kube nezizathu eziyisithupha ezilandelayo zokuthi kungani i-adhesive yesakhiwo inganamatheli ku-substrate:
⑴ I-substrate ngokwayo kunzima ukuyibopha, njenge-PP ne-PE. Ngenxa yokwakheka kwayo okuphezulu kwama-molecule kanye nokucindezeleka okuphansi kobuso, ayikwazi ukwakha ukusabalala kwe-molecule chain kanye nokunamathelana nezinto eziningi, ngakho-ke ayikwazi ukwakha isibopho esiqinile esibonakalayo. Ukunamathela;
⑵ Ububanzi bokubopha bomkhiqizo buncane, futhi bungasebenza kuphela kwezinye izinto ezingaphansi komhlaba;
⑶ isikhathi sokulungisa asanele. Ngokuvamile, ingcina yesakhiwo enezingxenye ezimbili kufanele ipholiswe okungenani izinsuku ezi-3, kuyilapho ingcina yengxenye eyodwa kufanele ipholiswe izinsuku ezi-7. Uma izinga lokushisa kanye nomswakama wendawo yokupholisa kuphansi, isikhathi sokupholisa kufanele sandiswe.
⑷ Isilinganiso sezingxenye A no-B asilungile. Uma usebenzisa imikhiqizo enezingxenye ezimbili, umsebenzisi kumele alandele ngokuqinile isilinganiso esidingwa umenzi ukuze alungise isilinganiso seglue eyisisekelo kanye ne-ejenti yokwelapha, ngaphandle kwalokho izinkinga zingase zivele esigabeni sokuqala sokwelapha, noma esigabeni sokugcina sokusetshenziswa maqondana nokunamathela, ukumelana nesimo sezulu kanye nokuqina. umbuzo;
⑸ Ukwehluleka ukuhlanza i-substrate njengoba kudingeka. Njengoba uthuli, ukungcola kanye nokungcola okusebusweni be-substrate kuzophazamisa ukubopha, kufanele kuhlanzwe kahle ngaphambi kokusetshenziswa ukuqinisekisa ukuthi inhlaka yesakhiwo kanye ne-substrate kuhlanganiswe kahle.
⑹ Ukwehluleka ukusebenzisa i-primer njengoba kudingeka. I-primer isetshenziselwa ukwelapha ngaphambi kobuso bephrofayili ye-aluminium, okungathuthukisa ukumelana namanzi nokuqina kwe-bond ngenkathi kunciphisa isikhathi se-bond. Ngakho-ke, ezinhlotsheni zangempela zobunjiniyela, kumele sisebenzise i-primer ngendlela efanele futhi sigweme ngokuqinile ukususwa kwe-gum okubangelwa izindlela zokusebenzisa ezingafanele.
2.8 Ukungahambelani nezesekeli
Isizathu sokungahambisani nezesekeli ukuthi i-sealant inokusabela ngokomzimba noma kwamakhemikhali nezesekeli ezithintanayo, okuholela ezingozini ezifana nokushintsha kombala kwe-adhesive yesakhiwo, ukunganamatheli ku-substrate, ukonakala kokusebenza kwe-adhesive yesakhiwo, kanye nokuphila okufushane kwe-adhesive yesakhiwo.
3. Isiphetho
I-silicone structure adhesive inamandla aphezulu, ukuqina okuphezulu, ukumelana nokuguga okuhle kakhulu, ukumelana nokushisa okuphezulu kanye nezinye izakhiwo ezinhle kakhulu, futhi isetshenziswa kabanzi ekubopheni kwesakhiwo kwezindonga zamakhethini okwakha. Kodwa-ke, ekusetshenzisweni okungokoqobo, ngenxa yezici zabantu kanye nezinkinga zezinto eziyisisekelo ezikhethiwe (izincazelo zokwakha azikwazi ukulandelwa ngokuqinile), ukusebenza kwe-structure adhesive kuthinteka kakhulu, futhi kuze kwenziwe kungafaneleki. Ngakho-ke, ukuhlolwa kokuhambisana kanye nokuhlolwa kokunamathela kwengilazi, izinto ze-aluminium kanye nezesekeli kufanele kuhlolwe ngaphambi kokwakhiwa, futhi izidingo zesixhumanisi ngasinye kufanele zilandelwe ngokuqinile ngesikhathi senqubo yokwakha, ukuze kufezwe umphumela we-structural adhesive futhi kuqinisekiswe ikhwalithi yephrojekthi.
Isikhathi sokuthunyelwe: Novemba-30-2022