Ii-Silicone sealants ziye zaba lukhetho lokuqala lweengcali kunye ne-DIYers ngokufanayo xa kufikwa ekutywineni imiphezulu eyahlukeneyo. Izitywini zeSilicone zineempawu ezintle zokuncamathelisa kunye nokuguquguquka, zibonelela ngokugqwesa ukuqina kwexesha elide kwiinkqubo ezahlukeneyo. Phakathi kweentlobo ze-silicone sealants ezithengiswa kwimarike, i-alkoxy silicone sealants kunye ne-acetoxy silicone sealants zimbini iintlobo ezidumileyo. Kwezi ndaba, siza kujonga nzulu kwiipropathi zezi zitywini, izinto ezilungileyo kunye nezibi zazo, kwaye sikuncede ubone olona khetho lufanelekileyo kwiimfuno zakho ezithile.
1. Umahluko kwisakhiwo:
Okokuqala, makhe siphonononge umahluko wesakhiwo phakathi kwe-alkoxy kunye ne-acetoxy. Iqela le-alkoxy liquka iqela le-alkyl (R-) elidityaniswe kwi-athomu ye-oxygen (-O-). Ngokusisiseko, yindibaniselwano yeqela le-alkyl kunye neoksijini.
Kwelinye icala, i-acetoxy ivela kwi-acetic acid. Iquka iqela le-acetyl (CH3CO-) eliboshwe kwi-athomu ye-oxygen (-O-). Ke, i-acetoxy inokuthathwa njengeqela le-alkyl endaweni yeoksijini ngaphakathi kwe-acetyl moiety.
Umahluko kwisakhiwo ukhokelela kwintlukwano kwiipropati zeekhemikhali kunye nokusebenza kwakhona phakathi kwe-alkoxy kunye namaqela e-acetoxy. Njengeqela elisebenzayo le-aliphatic, i-alkoxy ibonisa i-nucleophilic character kwaye kwezinye iimeko isebenza njengeqela elishiyayo. Oku kuziphatha kuxhomekeke kakhulu kwisazisi kunye neendawo zeqela le-alkyl elifakwe kwi-athomu ye-oksijini. Ekubeni amaqela e-alkoxy engasebenzi, i-electrophile enamandla okanye i-catalyst iyadingeka ukuqalisa ukusabela.
Ngokwahlukileyo, amaqela e-acetoxy abonisa i-reactivity eyahlukileyo ngenxa yobukho bamaqela e-acetyl. I-acetyl moiety kunye nenxalenye yayo yekhabhoni elungileyo inegalelo kubume be-electrophilic yeqela le-acetoxy. Ngoko ke, iqela le-acetoxy lithatha inxaxheba ngokusebenzayo kwi-acetylation reaction, idlulisela i-acetyl moiety kwezinye iimolekyuli. Iimpendulo ze-acetylation zikho kuyo yonke indawo ekudityanisweni kweziyobisi, iimveliso zendalo kunye neentlobo ezahlukeneyo zezinto eziphilayo.
2. I-alkoxy silicone sealants: Ukuvula amathuba amatsha
I-alkoxy silicone sealants ziyi-sealants ezenziwe ngokukodwa ngokusekelwe kwi-alkoxy yokunyanga iteknoloji. Ezi zitywina ziyaziwa ngeempawu zazo ezigqwesileyo zokudibanisa kwiintlobo ezahlukeneyo ze-substrates, kubandakanywa iglasi, i-ceramics, kunye neeplastiki ezithile. Ukukwazi kwabo ukumelanaamaqondo obushushu aphezulukwayeukuxhathisa imitha ye-UVibenza ukhetho lokuqala kwizicelo zangaphandle. Ukongeza, ii-alkoxylated silicone sealants zibalaseleyoukumelana nemozulu, ukuqinisekisa iziphumo ezihlala ixesha elide. Ngenxa yaboimodyuli ephantsikunye nokuguquguquka okuphezulu, banokuthatha iintshukumo ezidibeneyo, zibenze zilungele izicelo eziguquguqukayo. Inzuzo ebalulekileyo ye-alkoxylated silicone sealants yeyaboivumba eliphantsingexesha lokunyanga, oko kubenza basebenziseke ngakumbi kwiindawo ezivaliweyo.
3.I-Acetoxy Silicone Sealants: Izanyiwe kwaye yavavanywa
I-acetoxy silicone sealants, kwelinye icala, ithembele kwitekhnoloji yokunyanga i-acetoxy. Ezi zitywina zisetyenziswe kakhulu amashumi eminyaka kwaye ziyaziwa ngeempawu zazo zokutywina eziguquguqukayo. Benza izibophelelo eziqinileyo kunye nezona zinto ziqhelekileyo zokwakha, kuquka iglasi, isinyithi kunye neekeramics. I-acetoxy silicone sealants ibonakaliswe yiukunyanga ngokukhawulezakwaye kuhle kakhuluukumelana nokufuma. Olu nyango lukhawulezayo lwenza iiprojekthi zikhawuleze kwaye zibe lula. Qaphela, nangona kunjalo, ukuba i-acetoxy silicone sealants inokukhupha ivumba elifana neviniga njengoko iphilisa, ngoko ke ukungena komoya okwaneleyo kubalulekile.
4.Khetha i-silicone sealant efanelekileyo
Ukuqonda iimpawu ezizodwa zohlobo ngalunye lwe-silicone sealant lubalulekile ekwenzeni isigqibo esinolwazi. Izinto ezinje ngokuqina kwebhondi egqibeleleyo, amandla okudibanisa, ixesha lokunyanga, ukuba bhetyebhetye, ivumba kunye neemfuno ezithile zeprojekthi zonke kufuneka ziqwalaselwe. Apho ukuxhathisa kwimitha ye-UV, amaqondo obushushu agqithisileyo kunye nemozulu yangaphandle ibaluleke kakhulu, ii-alkoxylated silicone sealants zihlala zikhethwa. I-acetoxy silicone sealants ineempawu zokunyanga ngokukhawuleza kwaye lukhetho oluhle kakhulu kwiiprojekthi ezifuna ixesha elikhawulezayo lokuguqula kunye nebhondi yokuqala eyomeleleyo. Kwakhona, kuyafaneleka ukuba uqaphele ukuba zombini iintlobo ze-sealant zifumaneka ngemibala eyahlukeneyo, zibonelela ngeendlela zobuhle kwizicelo ezifuna ukugqitywa okubonakalayo.
Ukuqukumbela
Ngokudibeneyo, i-alkoxy kunye ne-acetoxy silicone sealants zibonelela ngeenzuzo ezizodwa ngokuxhomekeke kwiimfuno ezithile zeprojekthi. Isigqibo sokugqibela sixhomekeke kwiipropati zokubambelela, ixesha lokunyanga, ukuguquguquka, iphunga kunye nezinto zokusingqongileyo. Ukuqwalasela ulwazi oluchazwe kwezi ndaba, unokukhetha ngokuzithemba i-silicone sealant ehambelana neemfuno zakho.
Ixesha lokuposa: Jul-26-2023