Polyisocyanurate (PIR) yog ib hom thermosetting yas ua npuas ncauj khoom, uas muaj kev ua tau zoo dua li cov tsoos polyurethane (PU) ua npuas ncauj. Polyurethanes yog tsim los ntawm cov tshuaj tiv thaiv ntawm isocyanates xws li diphenylmethane diisocyanate, los yog MDI, nrog polyols, thaum PIR koom nrog ntau cov tshuaj tiv thaiv uas cov isocyanate tsis tsuas yog cuam tshuam nrog polyol, tab sis kuj trimerizes. Cov tshuaj tiv thaiv no tsim cov qauv nplhaib tshwj xeeb hauv cov khoom siv polymer, muab PIR zoo heev tiv thaiv hluav taws, thermal rwb thaiv tsev zog thiab txhua yam muaj zog. Cov txiaj ntsig zoo no ua rau PIR muaj kev 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 tau piav qhia tias yog ib qho kev tshaj lij ntawm polyurethane vim nws cov tshuaj muaj pes tsawg leeg thiab cov khoom tshwj xeeb tsim tawm hauv cov txheej txheem ntau lawm. Hauv cov txheej txheem tsim khoom ntawm PIR, cov isocyanate ntau dhau yog siv thiab cov catalyst tshwj xeeb tau qhia los txhawb lub trimerization ntawm isocyanate. Cov khoom uas tshwm sim yog ib tug nruj nreem sib txuas thiab nruj heev ua npuas ncauj. Lub trimerization ntawm isocyanates tsim isocyanurate rings, uas yog lub luag hauj lwm rau kev txhim kho thermal stability thiab nplaim retardancy ntawm PIR piv rau cov tsoos PU foams.
Vim nws cov qauv kaw, PIR muaj cov thermal rwb thaiv tsev zoo heev thiab cov thermal conductivity tsawg, ua rau nws yog ib qho khoom siv nrov hauv tsev rwb thaiv tsev, chav tub yees, thiab lwm yam kev siv uas yuav tsum tau muaj kev ua haujlwm siab. Lub ntuj tiv thaiv hluav taws ntawm cov nplaim hluav taws ntxiv thiab cov nplhaib isocyanurate ua rau PIR xaiv kev nyab xeeb dua li polyurethane hauv ib puag ncig uas tiv thaiv hluav taws tseem ceeb.
Catalystshauv PIR Production
Kev ua tiav ntawm polyisocyanurate ua npuas ncauj yog nyob ntawm qhov muaj cov catalysts tshwj xeeb uas tswj cov tshuaj tiv thaiv ntawm MDI thiab polyol thiab txhawb kev trimerization ntawm pawg isocyanate. Catalysts yog qhov tseem ceeb hauv kev tswj tus nqi ntawm cov tshuaj tiv thaiv, kom ntseeg tau tias ua npuas ncauj nce, thiab txiav txim siab qhov kawg ntawm cov npuas dej.
Hauv PIR cov tshuaj tiv thaiv, ob hom catalysts feem ntau ua haujlwm:
Gelling Catalysts:Cov catalysts txhawb cov tshuaj tiv thaiv ntawm isocyanate thiab polyol, uas ua rau tsim cov urethane bonds uas ua rau cov npuas lub hauv paus qauv. Gelling catalysts pab tswj cov khoom siv hluav taws xob ntawm cov npuas dej, xws li lub zog thiab yooj.
Trimerization Catalysts:Cov catalysts tshwj xeeb yog tsim los txhawb cov trimerization ntawm pawg isocyanate, uas ua rau tsim cov rings isocyanurate. Trimerization catalysts yog lub luag haujlwm rau kev tsim cov txheej txheem sib txuas sib txuas uas txawv PIR los ntawm polyurethane ua npuas ncauj. Kev xaiv thiab concentration ntawm trimerization catalyst muaj kev cuam tshuam ncaj qha rau cov thermal thiab nplaim hluav taws kub ntawm cov khoom ua npuas ncauj kawg.
MXC-TMA:Trimerization Catalyst rau PIR
MXC-TMA yog cov tshuaj sib tov uas txhawb nqa trimerization ntawm polyisocyanurate hauv kev tsim PIR ua npuas ncauj. Cov catalyst no ua kom lub cev tsis sib xws thiab tswj tau qhov nkhaus, uas yog qhov tseem ceeb rau kev ua tiav cov npuas ntom ntom thiab zoo. Siv MXC-TMA tso cai rau cov tuam txhab tsim PIR ua npuas ncauj thiab tswj nws cov thermal thiab cov khoom siv kho kom zoo kom zoo rau kev siv hauv tsev vaj huam sib luag, chav tub yees, thiab lwm yam kev siv insulating.
MXC-TMA muab cov tshuaj tiv thaiv ib puag ncig ruaj khov, ua rau txhim kho kev tsim khoom thiab txhim kho cov khoom siv. Los ntawm kev tswj tus nqi ntawm trimerization, nws pab cov tuam txhab tsim PIR ua npuas ncauj uas ua tau raws li cov qauv kev lag luam nruj heev rau kev rwb thaiv tsev, hluav taws kev nyab xeeb, thiab kev ua haujlwm ntev.
Xaus
Polyisocyanurate (PIR) foams yog lwm qhov zoo tshaj plaws rau polyurethane thiab muaj ntau yam zoo, nrog rau kev txhim kho hluav taws kub thiab rwb thaiv tsev kub. Lub luag haujlwm ntawm catalysts, tshwj xeeb tshaj yog trimerization catalysts xws li MXC-TMA, ua kom cov khoom zoo PIR foams. Tsis tsuas yog ua cov catalysts pab txhawb cov tshuaj tiv thaiv uas yuav tsum tau tsim cov qauv isocyanurate, tab sis lawv kuj ua kom muaj kev tswj hwm ntawm cov khoom ua npuas ncauj, ua rau PIR muaj kev xaiv dav rau ntau yam kev lag luam thiab kev tsim kho.
