Polyurethane ke polymer e feto-fetohang e sebelisoang lits'ebetsong tse fapaneng, ho tloha ho foam le lipente ho ea ho li-elastomer le likhomaretsi. Tlhahiso ea polyurethane e kenyelletsa karabelo e rarahaneng ea lik'hemik'hale pakeng tsa li-polyol le li-isocyanate, 'me li-catalyst li bapala karolo ea bohlokoa ho khanneng karabelo ena ka katleho. Har'a mefuta e fapaneng ea li-catalyst tse sebelisoang, li-catalyst tse thehiloeng ho amine li bohlokoa haholo ka lebaka la bokhoni ba tsona ba ho potlakisa karabelo le ho laola thepa ea sehlahisoa sa ho qetela.
Li-amine Tlhahisong ea Polyurethane
Li-amine ke metsoako ea tlhaho e nkiloeng ho ammonia 'me li khetholloa ka boteng ba sehlopha se le seng kapa tse ngata tsa alkyl kapa aryl tse khomaretsoeng athomong ea naetrojene. Moelelong oa tlhahiso ea polyurethane, li-catalyst tsa amine li sebelisoa ho nolofatsa liketso tsa urethane (polyol le isocyanate) le urea (metsi le isocyanate). Li-catalyst tsena li ka aroloa ka kakaretso ho li-amine tse tharo le li-polyol tse thehiloeng ho amine.
1. Li-Amine tse Phahameng: Tsena ke li-catalyst tsa amine tse sebelisoang haholo mefuteng ea polyurethane. Mehlala e kenyelletsa triethylenediamine (TEDA), dimethylcyclohexylamine (DMCHA), le bis(dimethylaminoethyl) ether (BDMAEE). Metsoako ena e ntlafatsa sekhahla sa karabelo, e ntlafatsa ho thehoa ha foam, 'me e susumetsa sebopeho sa sele sa foam ea polyurethane.
2. Li-Polyol tse Thehiloeng ho Amine: Tsena ke li-polyol tse sebetsang ka amine tse sebetsang joaloka polyol le catalyst. Li thusa haholo ho theheng litsamaiso tse tenyetsehang tsa foam moo ho hlokahalang hore ho be le karabelo e eketsehileng.
Sehokelo sa DABCO
DABCO, kapa 1,4-diazabicyclo[2.2.2]octane, ke sesebelisoa se tsebahalang haholo sa amine e phahameng indastering ea polyurethane. E sebetsa hantle haholo ho etseng hore li-gelling (ho thehoa ha urethane) le ho foka (ho thehoa ha carbon dioxide). Sebopeho se ikhethang sa DABCO se e lumella ho khothaletsa karabelo e leka-lekaneng, ho netefatsa thepa e ntle ea foam joalo ka bongata, boholo ba sele le matla a mechini.
1. POLYCAT 15: Ena ke catalyst e sebetsang hantle haholo e thehiloeng ho amine e etselitsoeng ho sebelisoa lits'ebetsong tsa foam ea polyurethane. E fana ka ts'ebetso e ntle ea catalytic, e khothalletsang sekhahla se potlakileng sa karabelo le thepa e ntlafalitsoeng ea foam. POLYCAT 15 e sebetsa haholo-holo lits'ebetsong tsa foam tse tenyetsehang le tse thata, e fana ka litšobotsi tse ntlafalitsoeng tsa ts'ebetso le ts'ebetso e phahameng ea sehlahisoa sa ho qetela.
2. DABCO T: Sesebediswa sena sa ho baka ke mofuta o mong wa lelapa la DABCO, se etseditsweng ka ho kgetheha ditshebediso tse ikgethang tsa polyurethane. DABCO T e tsebahala ka mosebetsi wa yona o matla wa ho baka le bokgoni ba yona ba ho fana ka tshebetso e tsitsitseng le e tshepahalang mefuteng e fapaneng ya foam. E sebediswa haholo ditsamaisong tse tenyetsehang le tse thata tsa foam, e fanang ka taolo e ntlafetseng hodima thepa ya mmele ya foam.
Qetello
Li-amine, haholo-holo li-amine tse phahameng joalo ka DABCO, li bapala karolo ea bohlokoa ts'ebetsong ea tlhahiso ea polyurethane. Li-catalyst tse kang POLYCAT 15 le DABCO T li bohlokoa bakeng sa ho fihlela sekhahla se lakatsehang sa karabelo le thepa ea foam, ho netefatsa lihlahisoa tsa polyurethane tsa boleng bo holimo. Ka ho utloisisa le ho sebelisa li-catalyst tsena ka katleho, bahlahisi ba ka ntlafatsa lits'ebetso tsa bona tsa tlhahiso le ho ntlafatsa ts'ebetso ea lits'ebetso tsa bona tsa polyurethane.
Nako ea poso: Phuptjane-24-2024