Niaj hnub no peb yuav ua kom paub cov kua liquefied MDI nrog cov ntim loj tshaj plaws hauv MDI hloov kho. Nws yog raws li MDI ntshiab raws li cov khoom siv raw, thiab cov khoom tsim nyog (xws li cyclic phosphine oxide compound) raug xaiv. Tom qab cua sov ua ke, MDI tus kheej-polymerizes thiab tso tawm carbon dioxide los ua cov kua sib tov uas muaj ib feem ntawm carbonized diimide pab pawg (-N=C=N-). Tau kawg, vim muaj ntau txoj kev hloov kho, MDI hloov tau tsuas yog muab faib ua MDI. hloov los ntawm carbamate, MDI hloov los ntawm carbonized diimide, MDI hloov los ntawm diazocyclobutanone imine thiab MDI hloov los ntawm carbamate thiab diazocyclobutanone imine.Vim cov ntshiab MDI yog khoom nyob rau hauv chav tsev kub, nws yog tsis yooj yim rau siv, thiab 4,4-MDI muaj tsis zoo stability thaum lub sij hawm cia. Ntshiab MDI yuav tsum tau rhuab thiab yaj rau hauv cov kua ua ntej siv, thiab rov ua cua sov cuam tshuam rau qhov zoo ntawm MDI, yog li hloov kho MDI feem ntau siv.
Cov kev lag luam twg raug hloov kho MDI feem ntau siv hauv?
Yog li dab tsi kev lag luam raug hloov kho MDI feem ntau siv hauv?Raws li Xiaobian txoj kev nkag siab, hloov MDI muaj qhov zoo ntawm kev ruaj ntseg zoo thiab qhov muag pom, yog li nws muaj qhov chaw siab thiab siv tus nqi hauv kev lag luam tsheb thiab kev lag luam rooj tog.Tsis tas li ntawd, vim tias hloov kho MDI yog qhov yooj yim dua los siv dua li ntshiab MDI, nws kuj yog siv rau hauv ntau yam xws li tsheb, tsheb sib tsoo, thiab lwm yam. ua tau tau piav tias muaj peev xwm loj hlob zoo.
Hloov kho MDI, lub npe nrov hauv kev ua lag luam tom qab MDI hloov kho, tam sim no tsis muaj kev sib koom ua ke thiab cov ntsiab lus meej hauv kev ua lag luam.In layman cov ntsiab lus, lub ntsiab hloov MDI ntawm kev ua lag luam tau muab faib ua peb hom, xws li:
(1) Carbonized diimide hloov MDI, uas yog, liquefied MDI, tseem hu ua monomer hloov MDI, yog ntshiab MDI los ntawm nws tus kheej condensation cov tshuaj tiv thaiv, nyob rau hauv uas carbonized diimide pawg (-N=C=N-) yog qhia, lub hom phiaj yog kom nws yooj yim rau khaws cia, thauj, thiab txheej txheem.Nws yog tsuas yog siv nyob rau hauv lub teb ntawm molding, tus kheej -skinning, khau ntaub, thiab lwm yam.
(2) MDI-50, 4-4MDI (ntshiab MDI) thiab 2-4MDI yog sib xyaw hauv qhov sib piv ntawm 50% txhua. Nws yog qhov tshwj xeeb sib xyaw hloov kho MDI, uas feem ntau yog siv rau hauv cov kab khiav khiav, cov nplaum, txheej thiab lwm yam.
(3) MDI prepromers, reactive semi{1}}cov khoom tiav uas muaj active hydroxyl pawg, mercapto pawg, amino pawg, thiab lwm yam. los yog polyethers ntawm no react nrog ntau tshaj MDI los ua carbamate bonds thiab raug txiav los ntawm NCO pab pawg. adhesives, elastomers thiab lwm yam.