IiHydrofluoroolefins (iiHFO) zivele njengenxalenye ebalulekileyo kwimveliso yeefoam ze-polyurethane ezikhuselayo, ikakhulu ngenxa yokuba amandla azo okufudumala kwehlabathi aphantsi (i-GWP) xa kuthelekiswa nee-agents zemveli zokuvuthela ezifana neehydrofluorocarbons (iiHFCs) kunye neehydrochlorofluorocarbons (iiHCFCs). Kwezi nkqubo, ukuzinza nokusebenza kwee-catalysts ze-polyurethane kubalulekile ekufezekiseni iimpawu zefoam ezifunekayo. Phakathi kwee-catalysts ezisetyenziswa kwiinkqubo ezisekwe kwi-HFO, i-DMDEE (i-Dimethylethanolamine) ivelele ngenxa yokuhambelana kwayo okugqwesileyo kunye nokuzinza.
Ukuzinzisa iiNkqubo eziSekelwe kwi-HFO
Ii-HFO ziyathandwa kakhulu kushishino ngenxa yeenzuzo zazo zokusingqongileyo kunye nokusebenza kakuhle ekugqumeni i-foam. Nangona kunjalo, ukungeniswa kwee-HFO kwiinkqubo ze-polyurethane kudala imingeni eyahlukileyo, ngakumbi malunga nokuzinza kwee-catalysts. Ii-amine catalysts zemveli zinokubonisa ukuzinza okunciphileyo kwiinkqubo ezisekwe kwi-HFO, nto leyo ekhokelela ekungahambelani komgangatho kunye nokusebenza kwe-foam. Kulapho keI-DMDEEidlala indima ebalulekileyo.
I-DMDEE yaziwa ngomsebenzi wayo ophantsi we-amine, nto leyo eyenza ukuba izinze kakhulu xa isetyenziswa kwiinkqubo ze-polyurethane ezisekelwe kwi-HFO. Olu zinzo lubalulekile ekuqinisekiseni ukuveliswa kwe-foam rhoqo, njengoko kuthintela ukusabela kwangaphambi kwexesha okunokuphazamisa ulwakhiwo lwe-foam kunye neempawu zokukhusela. Ukuhambelana kwe-DMDEE nee-HFO kuqinisekisa ukuba ihlala isebenza kuyo yonke inkqubo yokukhupha i-foam, inegalelo kwisakhiwo seseli esifanayo kunye nokusebenza kakuhle kokukhusela.
Ukusetyenziswa Okubanzi kwi-HFO-StabilizedIsikhanyisiIzisombululo
Ukuzinza kwe-DMDEE kwii-HFO kukhokelele ekubeni yamkelwe ngokubanzi phantse kuzo zonke izicombululo ze-catalyst ezisekelwe kwi-HFO. Isebenza kakuhle kakhulu ekugcineni ulungelelwano phakathi kweempendulo zokuvuthela nezokupholisa, nto leyo ibalulekileyo ekufezekiseni i-foam esemgangathweni ophezulu eneempawu ezintle zokuthintela ubushushu. Umsebenzi we-amine onciphileyo we-DMDEE awugcini nje ngokuphucula ukuzinza kwayo kodwa ukwanegalelo ekulungisweni kakuhle kweprofayili yempendulo ye-foam, ukuqinisekisa inkqubo yokufutha egudileyo nelawulwayo.
Iiarhente zokuvuthela kwimveliso ye-Polyurethane Foam
Ukongeza kwi-HFOs, ezinye ii-blowing agents ezahlukeneyo ziyasetyenziswa ekuveliseni ii-polyurethane foams, kuquka ii-HFCs, ii-HCFCs, ii-formates, ii-ketones (ezifana ne-acetone), kunye nee-hydrocarbons. Ngayinye kwezi arhente ineempawu zayo ezinokuchaphazela ukhetho lwee-catalysts. Nangona kunjalo, kwiinkqubo ezisekwe kwi-HFO, ukusetyenziswa kwe-DMDEE kuye kwaba yinto ebaluleke kakhulu ngenxa yokuzinza nokusebenza kwayo okungenakuthelekiswa nanto.
Ukuqukumbela, i-DMDEE catalyst idlala indima ebalulekileyo ekuzinziseni iinkqubo ze-polyurethane ezisekelwe kwi-HFO, iqinisekisa umgangatho we-foam ohambelanayo kunye nokusebenza ngcono kokufakwa kwe-insulation. Ukuhambelana kwayo ne-HFOs kuyenza ibe yinxalenye ebalulekileyo kwizisombululo zanamhlanje zokufakwa kwe-insulation ezinobuhlobo nokusingqongileyo.
Ixesha lokuthumela: Agasti-26-2024