Kodi Metal Catalyst ndi chiyani?
A chothandizira chachitsulondi chinthu chokhala ndi maatomu achitsulo chomwe chimapangitsa kuti zinthu zisinthe popanda kugwiritsidwa ntchito. Pakupanga polyurethane, zinthu zosinthira zitsulo zimathandizira kuti zinthu zisinthe monga urethane (polyol-isocyanate reaction) ndi urea (water-isocyanate reaction). Zinthu zosinthira zitsulo zimathandizira kuti zinthu zisinthe, zimachepetsa nthawi yopangira, komanso zimaonetsetsa kuti thovu la polyurethane limakhala ndi mphamvu komanso mphamvu zofunikira.
Kugawa kwa Zitsulo Zothandizira
Ma catalyst achitsulo amagawidwa m'magulu ambiri kutengera kapangidwe kake ka mankhwala, magwiridwe antchito, ndi mtundu wake wachitsulo. Nazi magulu ofunikira:
1. Zothandizira Zochokera ku Tin
Chitsanzo: MXC-T12(DBTDL)Dibutyltin dilaurate, Tin octoate.
Mapulogalamu: Amagwiritsidwa ntchito kwambiri mu thovu la polyurethane, zokutira, zomatira, ndi zomatira.
Katundu: Mphamvu yayikulu yothandiza kuti polyol-isocyanate reaction ichitike. Nthawi zambiri imagwirizanitsidwa ndi nkhawa zokhudzana ndi chilengedwe komanso poizoni.
2. Zothandizira Zochokera ku Bismuth
Chitsanzo: MXC-B20 (chothandizira cha Bismuth carboxylate).
Mapulogalamu: Njira ina m'malo mwa ma catalyst okhala ndi tin m'ma thovu olimba komanso osinthasintha.
Katundu: Yopanda poizoni komanso yoteteza chilengedwe. Yogwira ntchito bwino ikafuna fungo lochepa komanso mpweya wochepa. Imalimbikitsa kuuma bwino kwa kumbuyo komanso kukhuthala kochedwa.
3. Zothandizira Zochokera ku Zinc
Chitsanzo: Zinc neodecanoate.
Mapulogalamu: Ma thovu osinthasintha, ma elastomer, ndi zokutira.
Katundu: Mtengo wotsika komanso ntchito yochepa yothandiza. Nthawi zambiri imagwiritsidwa ntchito m'njira zomwe zimafuna kusankha bwino.
4. Zothandizira Zochokera ku Titanium
Chitsanzo: Titanium alkoxides.
Mapulogalamu: Zophimba, zotsekera, ndi zomatira.
Katundu: Mphamvu yothandiza kwambiri pa zochitika zinazake. Sizofala kwambiri mu thovu la polyurethane chifukwa cha mtengo wake wokwera.
5. Bismuth-Tin kapena Mixed-Metal Catalysts
Chitsanzo: Kuphatikiza kwa bismuth ndi tin catalysts.
Mapulogalamu: Amagwiritsidwa ntchito poyesa magwiridwe antchito ndi mtengo wake komanso kuchepetsa poizoni.
Katundu: Zotsatira zogwirizana kuti ziwonjezere mawonekedwe enieni a zochita.
6. Zida Zina Zothandizira Zitsulo
Zitsanzo: Zothandizira kupanga zinthu zopangidwa ndi aluminiyamu, cobalt, manganese, kapena chitsulo.
Mapulogalamu: Ntchito zapadera mu zophimba kapena ma elastomer.
Katundu: Kupereka ubwino wapadera monga kukhazikika kwa kutentha kwambiri kapena kusankha zochita mwapadera.
MXC-B20: Bismuth Carboxylate Catalyst monga Cholowa M'malo mwa Tin
MXC-B20 ndi pulogalamu yachothandizira cha bismuth metal carboxylateYopangidwa ngati njira ina yosawononga chilengedwe m'malo mwa zinthu zoyambira zopangidwa ndi zitini. Imagwiritsidwa ntchito mu thovu la polyurethane pofuna kulimbikitsa:
- Kukhazikika kwa Kukhuthala Kochedwa
imapereka ulamuliro wabwino kwambiri pa nthawi yoyamba yopanga thovu. - Kuchiritsa Kwabwino Kwambiri Kumbuyo: Kuonetsetsa kuti zinthu zonse zili bwino popanda kusokoneza kukhazikika kwa ntchito.
- Kusamalira Zachilengedwe: Yopanda mankhwala a mercury, lead, ndi tin, mogwirizana ndi malamulo okhwima okhudza chilengedwe.
- Kusinthasintha: Imagwirizana ndi ma polyol olimba komanso ofewa, zomwe zimathandiza kuti igwiritsidwe ntchito mu ma thovu olimba, ma thovu okwera kwambiri, komanso machitidwe a microporous.
Ubwino wa Bismuth Catalysts Poyerekeza ndi Tin Catalysts
Kuchepetsa poizoni ndi kuchepetsa kuwonongeka kwa chilengedwe. Kuchepetsa fungo ndi mpweya woipa mu chinthu chomaliza. Kukhazikika kwapamwamba mu mapangidwe amadzi.
Pomaliza, zinthu zopangira zitsulo monga MXC-B20 zimathandiza kwambiri pakupititsa patsogolo kupanga polyurethane kokhazikika komanso kogwira ntchito bwino popereka njira zina m'malo mwa njira zachikhalidwe zopangira tin.
Nthawi yotumizira: Novembala-26-2024