Hydrofluoroolenfins (HFOs) tau tshwm sim los ua ib qho tseem ceeb hauv kev tsim cov polyurethane ua npuas dej rwb thaiv tsev, feem ntau yog vim lawv qhov qis dua qhov kub ntawm lub ntiaj teb (GWP) piv rau cov neeg sawv cev ib txwm muaj xws li hydrofluorocarbons (HFCs) thiab hydrochlorofluorocarbons (HCFCs). Hauv cov kab ke no, qhov ruaj khov thiab kev ua tau zoo ntawm polyurethane catalysts yog qhov tseem ceeb rau kev ua tiav cov khoom ua npuas dej xav tau. Ntawm cov catalysts siv hauv HFO-based systems, DMDEE (Dimethylethanolamine) sawv tawm vim nws qhov sib xws thiab kev ruaj khov tshwj xeeb.
Kev Ruaj Ntseg Cov Txheej Txheem HFO
Cov HFOs tau txais kev nyiam ntau ntxiv hauv kev lag luam vim lawv cov txiaj ntsig zoo rau ib puag ncig thiab kev ua haujlwm zoo hauv kev rwb thaiv tsev ua npuas ncauj. Txawm li cas los xij, kev qhia txog HFOs rau hauv cov kab ke polyurethane ua rau muaj kev cov nyom tshwj xeeb, tshwj xeeb tshaj yog hais txog kev ruaj khov ntawm cov catalysts. Cov catalysts amine ib txwm muaj peev xwm ua rau muaj kev ruaj khov tsawg dua hauv cov kab ke HFO, ua rau muaj kev tsis sib xws hauv qhov zoo thiab kev ua haujlwm ntawm cov npuas ncauj. Qhov no yog qhov uasDMDEEua lub luag haujlwm tseem ceeb.
DMDEE paub txog nws cov kev ua haujlwm amine txo qis, uas ua rau nws ruaj khov heev thaum siv rau hauv cov kab ke polyurethane HFO. Qhov kev ruaj khov no yog qhov tseem ceeb rau kev ua kom muaj kev ua npuas ncauj tas li, vim nws tiv thaiv kev ua xua ua ntej uas yuav ua rau cov qauv ua npuas ncauj thiab cov khoom rwb thaiv tsev puas tsuaj. Qhov sib xws ntawm DMDEE nrog HFOs ua kom ntseeg tau tias nws tseem ua haujlwm thoob plaws hauv cov txheej txheem ua npuas ncauj, pab txhawb rau cov qauv cell sib xws thiab kev ua haujlwm rwb thaiv tsev zoo tshaj plaws.
Siv dav hauv HFO-StabilizedCov tshuaj catalystCov Kev Daws Teeb Meem
DMDEE qhov kev ruaj khov nrog HFOs tau ua rau nws siv dav hauv yuav luag txhua qhov kev daws teeb meem catalyst raws li HFO. Nws muaj txiaj ntsig zoo hauv kev tswj hwm qhov sib npaug ntawm kev tshuab thiab kev kho, uas yog qhov tseem ceeb rau kev ua tiav cov npuas dej zoo nrog cov khoom rwb thaiv tsev zoo heev. Qhov kev ua haujlwm amine txo qis ntawm DMDEE tsis yog tsuas yog txhim kho nws qhov kev ruaj khov xwb tab sis kuj pab txhawb rau kev kho kom zoo ntawm cov npuas dej cov tshuaj tiv thaiv, ua kom ntseeg tau tias cov txheej txheem ua npuas dej du thiab tswj tau.
Cov Neeg Sawv Cev Tshuab Hauv Kev Tsim Khoom Polyurethane Ua Npuas Ncauj
Ntxiv rau HFOs, ntau lwm yam khoom siv rau kev tsim cov polyurethane ua npuas ncauj, suav nrog HFCs, HCFCs, formates, ketones (xws li acetone), thiab hydrocarbons. Txhua tus neeg sawv cev no muaj nws cov yam ntxwv uas tuaj yeem cuam tshuam rau kev xaiv cov catalysts. Txawm li cas los xij, hauv cov kab ke HFO, kev siv DMDEE tau dhau los ua qhov tseem ceeb vim nws qhov kev ruaj khov thiab kev ua tau zoo tsis sib xws.
Xaus lus, DMDEE catalyst ua lub luag haujlwm tseem ceeb hauv kev ruaj khov ntawm HFO-based polyurethane systems, ua kom muaj kev ua npuas ncauj zoo thiab txhim kho kev ua haujlwm rwb thaiv tsev. Nws qhov sib xws nrog HFOs ua rau nws yog ib qho tseem ceeb hauv cov kev daws teeb meem rwb thaiv tsev niaj hnub, uas zoo rau ib puag ncig.
Lub sijhawm tshaj tawm: Lub Yim Hli-26-2024