2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Methylene diphenyl diisocyanate yog ib qho tshuaj tsw qab diisocyanate. Peb isomers muaj ntau, sib txawv los ntawm txoj haujlwm ntawm pawg isocyanate nyob ib ncig ntawm lub nplhaib: 2, 2′-MDI, 2, 4′-MDI, thiab 4, 4′-MDI. 4, 4′ isomer feem ntau siv, thiab tseem hu ua 4, 4′-diphenylmethane diisocyanate.
MDI tshuaj siv rau dab tsi?
Ntxig foams, qhov hluav taws xob loj tshaj plaws rau MDI, feem ntau yog siv hauv kev tsim kho, tub yees, ntim khoom thiab rwb thaiv tsev. MDI kuj tseem siv los ua cov binders, elastomers, adhesives, sealants, coatings thiab fibers.
MDI puas txaus ntshai?
MDI yog qhov txaus ntshai tshaj plaws ntawm cov isocyanates uas nquag muaj, tab sis tsis zoo. Nws cov vapor siab tsawg heev txo nws cov kev phom sij thaum tuav piv rau lwm cov isocyanates loj (TDI, HDI).
MDI yog dab tsi?
Diphenylmethane diisocyanate (MDI) yog ib tug tswv cuab ntawm tsev neeg diisocyanate txuam nrog polyurethane chemistry. Lub sij hawm polyurethane siv rau ntau cov polymers tsim los ntawm polyaddition ntawm polyfunctional isocyanates thiab isocyanate-reactive polyfunctional compounds.
MDI hauv rwb thaiv tsev yog dab tsi?
Methylene diphenyl diisocyanate, los yog MDI, yog ntau yam molecule uas xa cov khoom sib txawv rau ntau yam kev siv. Qhov kawg siv rau MDI suav nrog: Ua npuas ncauj rwb thaiv tsev rau cov khoom siv thiab kev tsim kho.
Pom zoo:
Dab tsi yog kev vam meej cov lus dab neeg hais txog lub ntsiav tshuaj ntawm txoj hmoo?
In Mesopotamian mythology, Tablet of Destinies (Sumerian: ???? dub namtarra; Akkadian: ṭup šīmātu, ṭuppi šīmāti) yog envisaged li av nplaum ntsiav tshuaj sau nrog cuneiform Kev sau ntawv, kuj zoo siab rau lub tog raj kheej cov ntsaws ruaj ruaj, uas, raws li cov ntaub ntawv raug cai ruaj khov, tau lees paub rau tus vaj tswv Enlil Enlil Enlil, tom qab lub npe hu ua Elil, yog tus vajtswv Mesopotamian thaum ub cuam tshuam nrog cua, huab cua, ntiaj teb, thiab cua daj cua dub.
Puas yog cov dab dab dab dab dab dab dab dab dab dab dab dab?
Myth: Ib tug dab tshos tsis yog neeg ncaj ncees yog tiasnws haum yog. Fact: Tu siab, qhov no yog ib lo lus tsis tseeb uas tau raug perpetuated los ntawm aversive trainers. Txawm hais tias haum rau lub caj dab kom zoo khawb rau hauv cov tawv nqaij rhiab nyob ib ncig ntawm lub caj dab, uas ua rau muaj kev puas tsuaj loj rau cov thyroid, esophagus, thiab trachea.
Puas yog kev ua tau zoo yog lub cev lossis tshuaj lom neeg?
Lub cev muaj zog ntawm cov teeb meem suav nrog xim, tawv, tawv, ua kom zoo, solubility, hluav taws xob conductivity, ntom, khov cov ntsiab lus, cov ntsiab lus melting, thiab cov ntsiab lus kub. Puas yog malleability yog tshuaj lom neeg?
Zaj dab neeg hauv zaj dab neeg yog dab tsi?
zaj yog ua dab tsi. … Ib zaj dab neeg uas muaj zog yog nyob rau ntawm ib lub sijhawm-kev cuam tshuam ntawm tus qauv, ib qho kev hloov pauv, lossis ib qho kev ua-uas ua rau muaj lus nug loj heev, uas yuav tsum tau teb thoob plaws hauv zaj dab neeg.
Yuav siv tshuaj lom neeg li cas hauv tsev muag tshuaj?
Pharmaceutical chemistry thiab Organic chemistry yog koom nrog hauv kev npaj tshuaj. Analytical chemistry suav nrog kev tswj kom zoo thiab kev tshuaj xyuas ntawm cov kws tshuaj. Pharmaceutics daws cov teeb meem hauv kev tsim cov tshuaj xws li tshuaj ntsiav, ntsiav tshuaj, txhaj tshuaj thiab lwm yam.
