Cov ua npuas dej polyurethane uas yoog tau yog cov khoom siv tau ntau yam siv rau ntau yam kev siv, txij li cov khoom siv rau rooj tog mus txog rau cov rooj zaum hauv tsheb. Kev ua haujlwm ntawm cov ua npuas dej no yog cuam tshuam los ntawm kev xaiv cov tshuaj catalysts, uas tswj cov tshuaj tseem ceeb thaum lub sijhawm ua npuas dej. Ntawm cov tshuaj tseem ceeb uas koom nrog yog cov tshuaj gelation (kev tsim cov carbamates) thiab cov tshuaj ua npuas dej (cov tshuaj ntawm dej thiab isocyanates, tsim cov urea thiab roj). Cov tshuaj no yuav tsum tau sib npaug zoo kom tsim tau cov qauv ua npuas dej uas xav tau, txawm tias yog qhib-cell lossis kaw-cell.
Catalyst rau Cov Ua Npuas Uas Yooj Yim:MXC-A1 (BDMAEE)
MXC-A1, tseem hu ua N,N,N',N'-tetramethyl-2,2′-oxybis(ethylamine), yog ib qho ntawm cov tshuaj catalysts tertiary amine zoo tshaj plaws uas siv rau hauv kev tsim cov polyurethane flexible foam. Nws yog ib qho kua tsis muaj xim mus rau me ntsis daj nrog kev ua haujlwm catalytic siab heev thiab xaiv tau rau cov tshuaj ua npuas ncauj.MXC-A1feem ntau txhawb nqa cov tshuaj tiv thaiv urea (tshuaj tiv thaiv dej-isocyanate), tseem ceeb rau kev tsim cov ua npuas polyurethane mos thiab tawv.
Cov tshuaj tiv thaiv tseem ceeb hauv kev tsim ua npuas dej tuaj yeem faib ua:
- Kev Ua Haujlwm Gelation:Kev tsim cov carbamates los ntawm kev cuam tshuam cov isocyanates nrog hydroxyl (-OH) pawg hauv polyols.
- Kev Ua Npuas Ncauj Ua Rau:Qhov kev sib xyaw ntawm isocyanates nrog dej, ua rau muaj cov urea thiab cov pa roj uas nthuav cov qauv ua npuas ncauj.
Kev Sib Npaug ntawm Gelation thiab Foaming Reactions
Qhov ua tau zoo ntawm cov qauv ua npuas ncauj uas yoog tau—txawm tias nws yog qhib-cell (tso cai rau cua hla) lossis kaw-cell (muab kev rwb thaiv tsev zoo dua)—nyob ntawm qhov sib npaug ntawm qhov nrawm ntawm kev sib xyaw thiab qhov nrawm ntawm cov roj nthuav dav. Qhov sib npaug no raug tswj los ntawm kev kho hom thiab qhov ntau ntawm cov tshuaj catalysts thiab cov tshuaj ua npuas ncauj ruaj khov hauv cov mis.
MXC-A1 yog qhov tsim nyog rau kev siv ua npuas dej uas muaj zog heev (HR) thiab kev txhaj tshuaj molding (RIM) vim nws muaj peev xwm ua kom cov tshuaj ua npuas dej sai dua thaum tswj tau cov txheej txheem gelation. Los ntawm kev tswj qhov concentration ntawm catalyst, cov chaw tsim khoom tuaj yeem ua kom zoo dua qhov sib npaug ntawm kev tsim cov pa roj thiab kev ua kom zoo ntawm cov npuas dej.
Cov kev siv ntawm MXC-A1 hauv Cov Ua Npuas Ncauj Yooj Yim
MXC-A1 muaj kev siv dav hauv kev tsim yuav luag txhua hom polyurethane ua npuas ncauj, txawm hais tias nws cov haujlwm siab thiab kev ua haujlwm zoo ua rau nws tsim nyog rau cov khoom ua npuas ncauj mos. Hauv cov ua npuas ncauj uas muaj zog siab, xws li cov uas siv rau hauv lub rooj zaum hauv tsheb thiab cov ncoo rooj tog, MXC-A1 ua kom muaj cov qauv cell sib npaug thiab ua kom cov ua npuas ncauj ruaj khov thiab xis nyob. Nws kuj tseem siv dav hauv cov khoom RIM qhov twg cov ua npuas ncauj ywj pheej xav tau ua kom tau raws li cov khoom siv kho tshuab thiab lub cev xav tau.
Xaus lus, cov tshuaj polyurethane catalysts xws li MXC-A1 ua lub luag haujlwm tseem ceeb hauv kev ua tiav cov yam ntxwv kev ua tau zoo ntawm cov ua npuas dej yooj ywm. Los ntawm kev txhawb nqa cov tshuaj tiv thaiv foaming thiab gelation tseem ceeb, lawv tso cai rau cov chaw tsim khoom los kho cov qauv ua npuas dej, kev ua kom muaj zog, thiab kev ruaj khov rau cov kev xav tau tshwj xeeb.
Lub sijhawm tshaj tawm: Lub Ib Hlis-13-2025