Qhov txawv ntawm PUR thiab PIR
Muab nws yooj yim; PUR yog qhov sib npaug ntawm cov tshuaj tiv thaiv polyols thiab isocyanates los ua npuas dej. PIR yog cov ntawv luv ntawm lus Askiv polyisocyanurate, uas yog ib hom foams uas muaj cov pa roj carbon monoxide thiab nitrogen rau 6-tus tswv cuab nruj heterocyclic nplhaib tus yam ntxwv qauv.PIR yog cov tshuaj tiv thaiv ntau dhau ntawm isocyanates. Isocyanates tuaj yeem hnov mob nrog cov neeg ua npuas ncauj yam tsis tau ntxiv polyols los ntawm kev ntxiv ib qho tshwj xeeb hlau ntsev catalyst. Txawm li cas los xij, vim tias qhov brittleness yog qhov zoo heev, nws tsis muaj txiaj ntsig zoo, yog li cov neeg ntxiv qis-hydroxyl polyols los ntawm kev hloov kho los txhim kho lub brittleness ntawm npuas.
Qhov zoo ntawm PIR tshaj PUR:
(1) Qhov hluav taws kub tsis kam ntawm PIR zoo dua li ntawm PUR.PUR thiab PIR yog ob lub tshuab ua npuas dej. Polyols muab faib ua polyether polyols thiab polyester polyols. PUR yog lub tshuab ua npuas dej tsim los ntawm cov tshuaj tiv thaiv ntawm polyether polyols nrog isocyanates. PIR yog tsim los ntawm cov tshuaj tiv thaiv ntawm polyester polyols nrog isocyanates.Ib tug ntawm lawv, cov isocyanate Performance index ntawm PUR daim ntawv feem ntau yog nyob nruab nrab ntawm 110 thiab 120, thiab cov degree ntawm crosslinking nyob rau hauv lub PUR ua npuas ncauj system feem ntau yog nyob ntawm lub functionality ntawm polyether polyol. , nrog rau qhov yuav tsum tau muaj zog ntxiv rau qhov ntsuas hluav taws kub, PUR foams ntsib cov teeb meem loj hauv kev sib ntsib kev tiv thaiv hluav taws. Feem ntau, txhawm rau ua kom tau raws li qhov yuav tsum tau muaj ntawm kev tiv thaiv hluav taws, ntau cov nplaim hluav taws yuav raug ntxiv rau hauv cov qauv txheej txheem, tab sis tib lub sijhawm nws yuav cuam tshuam rau lub zog compressive thiab qhov ntev ntawm qhov ua npuas ncauj thiab lwm yam khoom siv lub cev. , thiab nce tus nqi ntawm cov khoom.Qhov degree ntawm crosslinking ntawm PIR system nyob ntawm trimerization cov tshuaj tiv thaiv ntawm ntau tshaj isocyanate. Feem ntau, cov isocyanate Performance index nce mus txog 200 mus rau 300. Nyob rau hauv qhov kev txiav txim ntawm cov khoom catalyst, qhov ntau tshaj isocyanate tuaj yeem ua rau nws tus kheej ua rau lub nplhaib rau-tus tswv cuab, uas muab crosslinking rau lub tshuab ua npuas ncauj. Nyob rau tib lub sijhawm, nws tseem txhawb kev sib xyaw thiab coking rau hauv cov pa roj carbon monoxide los ntawm nws tus kheej rau lub nplhaib molecular qauv, uas txhim kho qhov hluav taws kub ntawm cov npuas dej.
(2) Cov tshuaj tiv thaiv PIR yog qhov yooj yim thiab cov khoom siv tsis tshua muaj nqi tuaj yeem siv tau.;
(3) PIR tuaj yeem muab cov khoom lag luam zoo dua qhov kev ruaj ntseg ntawm qhov kub thiab txias, qis thermal decomposition tus nqi, thiab cov txheej txheem tiv thaiv cov pa roj carbon monoxide tuaj yeem tsim thaum lub sij hawm combustion.
(4) Lub zog txhua yam ntawm PIR zoo dua li ntawm PUR;
(5) Kev ua tau zoo ntawm PIR yog siab.
Qhov tsis txaus ntawm PIR txheeb ze rau PUR:
(1) Siab brittleness thiab qis fluidity tshaj PUR;
(2) Lub adhesion tsis zoo, thiab qhov adhesion rau cov khoom nto tsuas yog 1/2 ntawm PUR.
(3) PIR muaj qhov ua tau zoo ntawm kev ua npuas dej nrawm, uas yuav cuam tshuam rau kev ua haujlwm ntawm daim ntawv.
(4) Qhov saum npoo maturation tsis zoo, thiab tom qab maturation yog lig;
(5) Cov txheej txheem ntau yog nqaim (qhov kub ntau lawm yog siab dua 60 degree), thiab qhov ntau lawm yog qhov nyuaj rau kev tswj.In nruam PIR daim ntawv ntau lawm, kev tswj cov khoom siv thiab qhov chaw sab nraud yog qhov tseem ceeb rau qhov zoo ntawm qhov kawg. khoom. Nws yog ib qho tsim nyog los ua kom muaj kev tswj xyuas qhov kub thiab txias ntawm ntau yam tshuaj raw khoom, vim tias qhov no muaj kev cuam tshuam loj rau kev ruaj ntseg ntawm tag nrho cov tshuaj tiv thaiv txheej txheem thiab tag nrho cov txheej txheem ua npuas dej.
PIR cov cai rau cov khoom siv:
(1) Lub preheating kub ntawm ob chav khiav yog ntau tshaj 70 degree;
(2) Qhov ntev ntawm ob txoj kab yog ntau dua 30 meters los xyuas kom meej lub sij hawm maturation;
(3) Yuav tsum tau nruab nrog lub phaj cua txias.