Luv Taw Qhia Ntawm Polyurethane Foam Joint Filler

1, Lub ntsiab muaj pes tsawg leeg ntawm polyurethane ua npuas ncauj sealant
Ua npuas ncauj nplaum yog tsim los ntawm polyurethane prepolymer, ua npuas ncauj sealant, catalyst, cross-linking tus neeg saib xyuas, thiab lwm yam, ntim rau hauv cov kaus poom hlau siab, thiab propane thiab lwm yam gases. Nws yog ib hom ntawm cov nplaum uas muaj foaming thiab bonding zog, feem ntau yog siv rau sau, sealing, thiab bonding ntug pob qij txha ntawm lub tsev qhov rooj thiab qhov rais, expansion pob qij txha ntawm cov khoom, thiab qhov. Nws yog cov khoom siv polyurethane elastic sealing ua npuas ncauj uas tso siab rau kev kho cov dej noo.
Muaj ob hom foam sealant: phom hom thiab raj hom. Hom phom tsuas tuaj yeem siv nrog rab phom tshwj xeeb polyurethane ua npuas ncauj, thiab cov raj hom yog nruab nrog cov roj hmab hose pov tseg.
2, MDI yog dab tsi (pure mdi, aggregated mdi), TDI, thiab qhov txawv ntawm ob?
Lub ntsiab raw khoom rau prepolymer yog isocyanate, uas yog MDI los yog TDI. MDI, tseem hu ua diphenylmethane diisocyanate, yog ib hom tseem ceeb heev ntawm isocyanate thiab cov khoom siv tseem ceeb rau kev tsim cov polyurethane (PU). MDI tuaj yeem muab faib ua ob pawg tag nrho: ntshiab MDI (dibenzyl methane diisocyanate) thiab polymerized MDI (muaj cov sib xyaw ntawm ib qho kev faib ua feem ntawm MDI ntshiab thiab polyphenyl polymethylene polyisocyanate), ntawm cov ntshiab MDI feem ntau yog siv rau hauv cov tawv hluavtaws, spandex, thiab khau khau, thiab lwm yam; Polymerized MDI feem ntau yog siv rau polyurethane nyuaj ua npuas ncauj (xws li rwb thaiv tsev txheej hauv cov tub yees thiab lub tub yees), polyurethane elastomers, thiab cov nplaum.
TDI yog cov ntawv luv rau toluene diisocyanate, tsis muaj xim, pob tshab lossis lub teeb daj kua uas yog cov organic compound nrog cov roj ntsha muaj zog.
TDI yog ib qho tseem ceeb ntawm cov khoom siv raw khoom rau kev tsim cov ntaub ntawv polyurethane, uas yog siv rau cov organic synthesis, ua npuas ncauj yas, coatings thiab tshuaj reagents.
Qhov txawv ntawm TDI thiab MDI yog dab tsi?
MDI thiab TDI yog hloov pauv rau ib leeg thiab yog ob qho tib si raw khoom rau kev tsim polyurethane. Txawm li cas los xij, vim qhov sib txawv ntawm cov qauv thiab kev ua tau zoo, kev siv segmented txawv heev: MDI feem ntau yog siv rau polyurethane nyuaj ua npuas ncauj thiab semi nyuaj ua npuas ncauj, siv rau hauv cov ntaub ntawv rwb thaiv tsev, automotive accessories, thiab kev tsim kho kev lag luam; TDI feem ntau yog siv hauv polyurethane mos ua npuas ncauj, siv rau hauv kev lag luam xws li rooj tog padding, suab-absorbing cov ntaub ntawv, thiab cov khoom ua si. Vim yog qhov muaj kuab lom heev ntawm TDI, nws daim ntawv thov raug txwv rau qee qhov, thiab nws tsis yog dav li MDI.