Ama-Silicone sealants abe ukukhetha kokuqala kochwepheshe kanye nama-DIYers ngokufanayo uma kukhulunywa ngokuvala indawo ehlukahlukene.Ama-Silicone sealants anezakhiwo ezinhle kakhulu zokunamathela nokuguquguquka, ahlinzeka ngokuqina okuhle kakhulu kwesikhathi eside kwezinhlelo zokusebenza ezahlukahlukene.Phakathi kwezinhlobonhlobo zama-silicone sealants ezithengiswa emakethe, ama-alkoxy silicone sealants nama-acetoxy silicone sealants yizinhlobo ezimbili ezithandwayo.Kulezi zindaba, sizobheka kabanzi izici zalawa ma-sealant, ubuhle nobubi bawo, futhi sikusize uthole inketho engcono kakhulu yezidingo zakho ezithile.
1.Umehluko wesakhiwo:
Okokuqala, ake sihlole umehluko wesakhiwo phakathi kwe-alkoxy ne-acetoxy.Iqembu le-alkoxy liqukethe iqembu le-alkyl (R-) elihlanganiswe ne-athomu yomoya-mpilo (-O-).Empeleni, iyinhlanganisela yeqembu le-alkyl nomoya-mpilo.
Kwesinye isici, i-acetoxy itholakala ku-acetic acid.Kuhlanganisa iqembu le-acetyl (CH3CO-) elihlanganiswe ne-athomu ye-oxygen (-O-).Ngakho-ke, i-acetoxy ingabhekwa njengeqembu le-alkyl esikhundleni somoya-mpilo ngaphakathi kwe-acetyl moiety.
Umehluko esakhiweni uholela ekuhlukeni kwezakhiwo zamakhemikhali kanye nokusebenza kabusha phakathi kwamaqembu e-alkoxy ne-acetoxy.Njengeqembu elisebenzayo le-aliphatic, i-alkoxy ibonisa umlingiswa we-nucleophilic futhi kwezinye izimo isebenza njengeqembu elishiya.Lokhu kuziphatha kuncike kakhulu ekwazini nasekubambeni esikhundleni seqembu le-alkyl elixhunywe ku-athomu yomoya-mpilo.Njengoba amaqembu e-alkoxy engasebenzi, i-electrophile eqinile noma i-catalyst iyadingeka ukuze kuqalwe ukusabela.
Ngokuphambene, amaqembu e-acetoxy abonisa ukusebenza kabusha okuhlukile ngenxa yokuba khona kwamaqembu e-acetyl.I-acetyl moiety kanye nengxenye yekhabhoni ephozithivu yayo inegalelo kumvelo ye-electrophilic yeqembu le-acetoxy.Ngakho-ke, iqembu le-acetoxy libamba iqhaza ngenkuthalo ekuphenduleni kwe-acetylation, lidlulisela i-acetyl moiety kwamanye ama-molecule.Ukusabela kwe-acetylation kukhona yonke indawo ekuhlanganiseni kwezidakamizwa, imikhiqizo yemvelo kanye nezinhlanganisela ezihlukahlukene zezinto eziphilayo.
2. Ama-alkoxy silicone sealants: Ukuvula amathuba amasha
Ama-alkoxy silicone sealants angama-sealant akhiwe ngokukhethekile ngokusekelwe kubuchwepheshe bokwelapha i-alkoxy.Lawa ma-sealants aziwa ngezakhiwo zawo ezinhle kakhulu zokuhlanganisa ama-substrates ahlukahlukene, okuhlanganisa ingilazi, izitsha zobumba, namapulasitiki athile.Ikhono labo lokumelanaamazinga okushisa aphezulufuthiukumelana nemisebe ye-UVibenza ukhetho lokuqala lwezinhlelo zokusebenza zangaphandle.Ngaphezu kwalokho, ama-alkoxylated silicone sealants angcono kakhuluukumelana nesimo sezulu, ukuqinisekisa imiphumela ehlala isikhathi eside.Ngenxa yaboimoduli ephansikanye nokuguquguquka okuphezulu, bangakwazi ukuhlalisa ukunyakaza okuhlangene, okubenza balungele izinhlelo zokusebenza eziguquguqukayo.Inzuzo enkulu ye-alkoxylated silicone sealants yiboiphunga eliphansingesikhathi sokwelapha, okubenza basebenziseke kalula ezindaweni ezivaliwe.
3.I-Acetoxy Silicone Sealants: Izanyiwe futhi Yahlolwa
Ngakolunye uhlangothi, ama-acetoxy silicone sealants, athembele kubuchwepheshe bokwelapha i-acetoxy.Lawa ma-sealants asesetshenziswe kakhulu amashumi eminyaka futhi aziwa ngezakhiwo zawo zokuvala eziguquguqukayo.Bakha izibopho eziqinile ngezinto zokwakha ezivame kakhulu, kuhlanganise ingilazi, insimbi kanye ne-ceramics.I-acetoxy silicone sealants ibonakala ngokuthiukwelapha ngokusheshafuthi kuhle kakhuluukumelana nomswakama.Lokhu kwelashwa okusheshayo kwenza amaphrojekthi asheshe futhi abe lula.Qaphela, nokho, ukuthi ama-acetoxy silicone sealants angakhipha iphunga elifana noviniga njengoba elapha, ngakho-ke umoya owanele ubalulekile.
4.Khetha i-silicone sealant efanele
Ukuqonda izici eziyingqayizivele zohlobo ngalunye lwe-silicone sealant kubalulekile ekwenzeni isinqumo esinolwazi.Izinto ezinjengamandla ebhondi ekugcineni, ikhono lokubopha, isikhathi sokwelapha, ukuguquguquka, iphunga kanye nezidingo ezithile zephrojekthi kufanele kubhekwe konke.Lapho ukumelana nemisebe ye-UV, amazinga okushisa aphakeme kanye nesimo sezulu sangaphandle kubalulekile, ama-alkoxylated silicone sealants ngokuvamile ayathandwa.Ama-acetoxy silicone sealants anezinto zokwelapha ngokushesha futhi ayisinqumo esihle kakhulu samaphrojekthi adinga isikhathi esisheshayo sokushintsha kanye nesibopho esiqinile sokuqala.Futhi, kubalulekile ukuqaphela ukuthi zombili izinhlobo ze-sealant zitholakala ngemibala ehlukahlukene, zinikeza izinketho zobuhle zezinhlelo zokusebenza ezidinga isiphetho esibukekayo.
Isiphetho
Ndawonye, ama-alkoxy ne-acetoxy silicone sealants anikeza izinzuzo ezihlukile kuye ngezidingo ezithile zephrojekthi.Isinqumo sokugcina sincike ezintweni zokunamathela, isikhathi sokwelapha, ukuguquguquka, iphunga kanye nezici zemvelo.Uma ucabangela ulwazi olwethulwe kulezi zindaba, ungakhetha ngokuzethemba i-silicone sealant evumelana nezidingo zakho.
Isikhathi sokuthumela: Jul-26-2023