Polyisocyanurate (PIR) yog ib hom khoom siv ua npuas thermosetting yas, uas muaj kev ua tau zoo dua li cov ua npuas polyurethane (PU) ib txwm muaj. Polyurethanes yog tsim los ntawm kev sib xyaw ntawm isocyanates xws li diphenylmethane diisocyanate, lossis MDI, nrog polyols, thaum PIR cuam tshuam nrog kev sib xyaw ua ke ntau dua uas isocyanate tsis tsuas yog sib xyaw nrog polyol, tab sis kuj trimerizes. Qhov kev sib xyaw ua ke no tsim cov qauv nplhaib tshwj xeeb hauv cov polymer matrix, muab PIR zoo heev tiv thaiv hluav taws, cov khoom rwb thaiv tsev thermal thiab lub zog kho tshuab. Cov txiaj ntsig no ua rau PIR xaiv dav rau ntau yam kev siv, tshwj xeeb tshaj yog hauv kev tsim kho, rwb thaiv tsev thiab kev tsim khoom lag luam.
Polyisocyanurate (PIR) yog dab tsi?
Polyisocyanurate (PIR) feem ntau yog piav qhia tias yog ib qho kev hloov pauv siab heev ntawm polyurethane vim nws cov tshuaj lom neeg muaj pes tsawg leeg thiab cov khoom tshwj xeeb uas tsim tawm hauv cov txheej txheem ntau lawm. Hauv cov txheej txheem ntau lawm ntawm PIR, isocyanate ntau dhau yog siv thiab cov catalyst tshwj xeeb yog qhia los txhawb kev trimerization ntawm isocyanate. Cov khoom tshwm sim yog ib qho ua npuas ncauj sib txuas thiab nruj heev. Kev trimerization ntawm isocyanates tsim cov nplhaib isocyanurate, uas yog lub luag haujlwm rau kev txhim kho thermal stability thiab nplaim taws retardancy ntawm PIR piv rau cov npuas PU ib txwm muaj.
Vim nws cov qauv kaw cell, PIR muaj cov khoom rwb thaiv tsev zoo heev thiab cov thermal conductivity qis, ua rau nws yog cov khoom siv nrov hauv kev tsim cov tshuab rwb thaiv tsev, cov tub yees, thiab lwm yam kev siv uas xav tau kev rwb thaiv tsev ua haujlwm siab. Cov khoom tiv thaiv hluav taws ntuj ntawm cov nplaim taws ntxiv thiab cov nplhaib isocyanurate ua rau PIR xaiv kev nyab xeeb dua li polyurethane hauv cov chaw uas kev tiv thaiv hluav taws tseem ceeb.
Cov tshuaj catalystshauv PIR Production
Kev ua tiav ntawm polyisocyanurate ua npuas ncauj nyob ntawm seb muaj cov tshuaj catalysts tshwj xeeb uas tswj cov tshuaj tiv thaiv ntawm MDI thiab polyol thiab txhawb nqa trimerization ntawm cov pab pawg isocyanate. Cov tshuaj catalysts yog qhov tseem ceeb hauv kev tswj hwm qhov nrawm ntawm kev tiv thaiv, xyuas kom meej tias cov npuas dej nce siab, thiab txiav txim siab cov khoom kawg ntawm cov npuas dej.
Hauv PIR cov tshuaj tiv thaiv, ob hom catalysts feem ntau siv:
Cov Catalysts Gelling:Cov tshuaj catalysts no txhawb nqa qhov kev sib xyaw ntawm isocyanate thiab polyol, ua rau muaj cov urethane bonds uas pab txhawb rau cov qauv yooj yim ntawm cov ua npuas ncauj. Cov tshuaj catalysts gelling pab tswj cov khoom siv kho tshuab ntawm cov ua npuas ncauj, xws li lub zog thiab kev ywj pheej.
Cov Catalysts Trimerization:Cov catalysts no yog tsim tshwj xeeb los txhawb kom muaj trimerization ntawm cov isocyanate pawg, ua rau muaj cov isocyanurate rings. Trimerization catalysts yog lub luag haujlwm rau kev tsim cov qauv cross-linked uas sib txawv PIR thiab polyurethane ua npuas ncauj. Kev xaiv thiab kev sib sau ua ke ntawm trimerization catalyst muaj kev cuam tshuam ncaj qha rau cov khoom thermal thiab nplaim taws ntawm cov khoom ua npuas ncauj kawg.
MXC-TMAIb qho Trimerization Catalyst rau PIR
MXC-TMA yog ib qho tshuaj sib xyaw uas txhawb nqa kev sib xyaw ua ke ntawm polyisocyanurate hauv kev tsim cov ua npuas ncauj PIR. Cov tshuaj catalyst no ua kom muaj qhov nkhaus nce siab sib npaug thiab tswj tau, uas yog qhov tseem ceeb rau kev ua tiav qhov ceev thiab zoo ntawm cov ua npuas ncauj. Kev siv MXC-TMA tso cai rau cov chaw tsim khoom tsim cov ua npuas ncauj PIR thiab tswj hwm nws cov khoom siv thermal thiab mechanical kom zoo tshaj plaws rau kev siv hauv cov vaj huam sib luag tsev, cov tub yees, thiab lwm yam kev siv rwb thaiv tsev.
MXC-TMA muab ib puag ncig ruaj khov, ua rau kev tsim khoom zoo dua thiab kev ua haujlwm ntawm cov khoom siv zoo dua. Los ntawm kev tswj tus nqi ntawm trimerization, nws pab cov chaw tsim khoom tsim cov ua npuas ncauj PIR uas ua tau raws li cov qauv kev lag luam nruj rau kev rwb thaiv tsev, kev nyab xeeb hluav taws, thiab kev ruaj khov mus sij hawm ntev.
Xaus lus
Cov ua npuas dej Polyisocyanurate (PIR) yog lwm txoj hauv kev zoo dua li polyurethane thiab muaj ntau yam zoo, suav nrog kev tiv thaiv hluav taws thiab kev rwb thaiv cua sov. Lub luag haujlwm ntawm cov catalysts, tshwj xeeb tshaj yog cov catalysts trimerization xws li MXC-TMA, ua kom muaj cov ua npuas dej PIR zoo. Tsis yog cov catalysts no pab txhawb cov tshuaj lom neeg uas xav tau los tsim cov qauv isocyanurate xwb, tab sis lawv kuj tseem ua rau muaj kev tswj hwm cov khoom ua npuas dej kom meej, ua rau PIR yog qhov kev xaiv dav rau ntau yam kev siv hauv kev lag luam thiab kev tsim kho.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-18-2024