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 eliqhotyoshelwe kwi-athomu ye-oxygen.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