Tus Catalyst Hlau Yog Dab Tsi?
A cov hlau catalystyog ib qho tshuaj uas muaj cov hlau atoms uas pab txhawb cov tshuaj tiv thaiv yam tsis tau noj hauv cov txheej txheem. Hauv kev tsim polyurethane, cov hlau catalysts ua kom cov tshuaj tiv thaiv tseem ceeb sai dua xws li kev tsim cov urethane (polyol-isocyanate reaction) thiab urea (water-isocyanate reaction). Cov hlau catalysts txhim kho kev ua haujlwm zoo, txo lub sijhawm tsim khoom, thiab xyuas kom meej cov khoom siv lub cev thiab tshuaj lom neeg ntawm polyurethane ua npuas ncauj.
Kev faib tawm ntawm Cov Catalysts Hlau
Cov tshuaj catalysts hlau raug faib ua pawg raws li lawv cov tshuaj lom neeg, kev ua haujlwm, thiab hom hlau tshwj xeeb. Hauv qab no yog cov kev faib tseem ceeb:
1. Cov Catalysts Uas Muaj Tin
Piv txwv: MXC-T12(DBTDL)Dibutyltin dilaurate, Tin octoate.
Cov ntawv thovSiv dav hauv polyurethane ua npuas ncauj, tshuaj pleev xim, nplaum, thiab sealants.
Cov Khoom: Muaj kev ua haujlwm catalytic siab rau cov tshuaj tiv thaiv polyol-isocyanate. Feem ntau cuam tshuam nrog kev txhawj xeeb txog ib puag ncig thiab kev lom.
2. Cov Catalysts Uas Muaj Bismuth
Piv txwv: MXC-B20 (Bismuth carboxylate catalyst).
Cov ntawv thovLwm txoj hauv kev rau cov catalysts raws li tin hauv cov npuas dej khov thiab cov khoom ua npuas dej.
Cov KhoomTsis muaj tshuaj lom thiab tsis ua rau ib puag ncig puas tsuaj. Siv tau zoo rau cov ntawv thov uas xav tau tsw qab tsawg thiab tsis muaj pa phem. Pab kom nws kho tau zoo heev nrog rau kev tsim cov viscosity qeeb.
3. Cov Catalysts Uas Muaj Zinc
Piv txwvCov khoom xyaw nquag: Zinc neodecanoate.
Cov ntawv thovCov khoom siv: Cov khoom siv ua npuas ncauj, cov khoom siv elastomers, thiab cov txheej txheem.
Cov KhoomTus nqi qis thiab muaj zog catalytic me ntsis. Feem ntau siv rau hauv cov formulations uas xav tau kev xaiv siab.
4. Cov Catalysts Uas Muaj Titanium
Piv txwvCov khoom xyaw: Titanium alkoxide.
Cov ntawv thov: Cov tshuaj pleev xim, cov tshuaj sealant, thiab cov nplaum.
Cov Khoom: Muaj zog catalytic activity rau cov tshuaj tiv thaiv tshwj xeeb. Tsis tshua muaj nyob rau hauv polyurethane ua npuas ncauj vim yog tus nqi siab.
5. Bismuth-Tin los yog Mixed-Metal Catalysts
Piv txwvKev sib xyaw ua ke ntawm bismuth thiab tin catalysts.
Cov ntawv thov: Siv los sib npaug kev ua tau zoo thiab tus nqi thaum txo cov tshuaj lom.
Cov Khoom: Cov teebmeem synergistic los txhim kho cov qauv tshuaj tiv thaiv tshwj xeeb.
6. Lwm Cov Khoom Siv Hlau
Piv txwvCov tshuaj catalysts uas muaj txhuas, cobalt, manganese, lossis hlau.
Cov ntawv thov: Cov ntawv thov tshwj xeeb hauv kev txheej lossis elastomers.
Cov KhoomMuab cov txiaj ntsig tshwj xeeb xws li kev ruaj khov ntawm qhov kub siab lossis kev xaiv cov tshuaj tiv thaiv tshwj xeeb.
MXC-B20: Bismuth Carboxylate Catalyst ua ib qho Tin-Based Substitute
MXC-B20 yog ib qhobismuth hlau carboxylate catalysttsim los ua ib qho kev xaiv zoo rau ib puag ncig rau cov tshuaj catalysts uas muaj tin. Nws yog siv rau hauv polyurethane ua npuas dej los txhawb:
- Kev Tsim Kho Viscosity qeeb
muab kev tswj hwm zoo dua thaum lub sijhawm pib ua npuas ncauj. - Kev Kho Kom Zoo Dua Tom Qab-End:Xyuas kom muaj zog kawg yam tsis muaj kev cuam tshuam rau kev ua haujlwm ruaj khov.
- Kev Phooj Ywg Zoo Rau Ib puag ncigTsis muaj mercury, lead, thiab tin sib xyaw, ua raws li cov cai ib puag ncig nruj dua.
- Kev siv tau ntau yam:Sib xws nrog ob qho tib si polyols tawv thiab mos, ua rau nws siv tau rau hauv cov ua npuas ncauj nruj, cov ua npuas ncauj ceev ceev, thiab cov kab ke microporous.
Cov txiaj ntsig ntawm Bismuth Catalysts Dua li Tin Catalysts
Txo cov tshuaj lom thiab txo qhov cuam tshuam rau ib puag ncig. Txo cov ntxhiab tsw thiab cov pa phem hauv cov khoom kawg. Kev ruaj khov zoo tshaj plaws hauv cov qauv dej.
Xaus lus, cov tshuaj catalysts hlau xws li MXC-B20 ua lub luag haujlwm tseem ceeb hauv kev txhawb nqa kev tsim khoom polyurethane uas ruaj khov thiab ua tau zoo los ntawm kev muab lwm txoj hauv kev rau cov txheej txheem ua los ntawm tin.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-26-2024