MDI -100 Yog mdi muaj ntau dua 99% ntawm 4,4'-diphenylmethane diisocyanate (thiaj li hu ua MDI). Nws yog dawb lossis daj tawv ntawm chav tsev kub, thiab melts mus rau hauv ib qho tsis muaj kua rau cov kua daj. Lub taw tes melting yog 38 degree, qhov tshwj xeeb nqus yog 1.19, thiab cov ntsiab lus ntawm "-nco" Pab Pawg yog 33.6%. Nws yog bifunctional (muaj ob pab pawg ob-seem ntawm ib qho molecule); Nws yog feem ntau siv nyob rau hauv kev lag luam polyurethane li fiber ntau (spandex), thiab tseem siv tau ua tus npaj precolymer (elastomer, thiab lwm yam) rau synthesis; Cov txheej txheem ntau lawm saws Nitrocelulose benzene catalystic hydrogenation txoj kev: rau kev sib hloov pauv, ua kom muaj txiaj ntsig zoo ib yam li kev ua kua) kom nws ua kua rau ntawm chav sov.
Polymeric MDI yog qhov sib xyaw muaj ob qho tib si 4,4'-diphenylmethane di ncauj
Qhov sib txawv tsuas yog los ntawm kev ntxiv cov khoom ntxiv nrog cov khoom siv dawb, tshuaj ntsuab yog cov xim av, tshuaj txhuam hniav tsaus ntuj nti Viscosity yog kho tau. Lub viscire ntawm General Polymer MDI feem ntau yog nruab nrab ntawm {3}} mpa mpa.s / 25 degree, thiab cov ntsiab lus ntawm "-nco" pawg yog}}}.
MDI (Diphenylmethane di ncauj diisocyanate) yog lub npe nrov ntawm cov khoom siv hauv cov chaw muaj kev lag luam. Polymeric MDI (PMDI), Lub Thawj Cov Qauv Txheej Txheem Kev Lag Luam / Kev Lag Luam uas muaj}|Rings thiab lwm yam me me, xws li 2,2'-omer. Qhov tseeb muaj pes tsawg leeg ntawm PMDI txawv nrog cov chaw tsim khoom. PMDI yog siv los ua kom nruj thiab ua npuas npuas yooj yim, foundry Resin Sand Cinders, thiab tshav kub ua kom sov, thiab tshav kub kub.
Cov kev tshawb fawb ntxiv yuav txheeb xyuas cov khoom ntxiv lossis kev lag luam siv ntawm cov tshuaj no.
Dab tsi ntxiv yog polymeric diphenylmethane dioolocyanate (pmdi) hu ua? Cov tshuaj no tuaj yeem txheeb xyuas los ntawm cov npe sib txawv, suav nrog: polymethylene polyphenylisocyanates, polymeric MDI Qhov no yuav tsis yog cov khoom lag luam los qhia thiab rho tawm cov tshuaj los ntawm lawv cov khoom kab.
Polymeric MDI, polymethylene polyphenylisocyanates, kuj p-mdi lossis pmdi, feem ntau yog siv hauv kev tsim khoom nyuaj thiab ib nrab-nyuaj polyurethane ua npuas dej. Polymeric MDI yog liquefied nyob rau hauv qhov kub thiab yooj yim los tuav thiab khaws cia rau -20 degree. Daim ntawv thov loj rau polymeric MDI, hauv polyurethanes kev lag luam, yog: Kev siv vaj huam sib luag, tshuaj ntxuav cua sov, tub yees thiab tsheb nyob sab nraud.