Kev ua tau zoo ntawm qhov kawgpolyurethane elastomeryog muaj zog cuam tshuam los ntawm hom prepolymer siv.
TDI prepolymers feem ntau tsim elastomers nrog ntau dua elongation thiab yooj. Lawv haum rau cov ntawv thov uas xav tau softness, resilience thiab dynamic kev ua tau zoo.
MDI prepolymers feem ntau muab lub zog tensile ntau dua, tsim kua muag ua haujlwm, puas ua haujlwm thiab thauj khoom -cov kabmob muaj peev xwm. Lawv feem ntau raug xaiv rau kev xav tau kev lag luam ib puag ncig uas qhov ua haujlwm ntev yog qhov tseem ceeb.
Piv nrog TDI cov tshuab, MDI-raws li polyurethane elastomers feem ntau ua kom pom kev ruaj ntseg zoo dua thiab siv lub neej ntev dua nyob rau hauv hnyav- lub luag haujlwm ua haujlwm.
MDI prepolymers feem ntau muab cov cua sov zoo dua li TDI prepolymers. Cov khoom siv polyurethane raws li MDI tuaj yeem tswj hwm lawv lub cev zoo dua thaum raug kub hnyiab.
MDI systems kuj zoo li ua kom pom kev txhim kho hydrolysis, ua rau lawv tsim nyog rau cov ntawv thov uas muaj cov dej noo, dej raug lossis qhov chaw ua haujlwm ntub dej.
TDI prepolymers muaj kev ua tau zoo nyob rau hauv cov qauv txheej txheem tab sis yuav qhia tau sai dua cov cuab yeej degradation nyob rau hauv hnyav thermal lossis hydrolytic tej yam kev mob.
Kev nyab xeeb yog lwm qhov tseem ceeb thaum xaiv polyurethane prepolymers.
TDI muaj qhov tsis muaj zog heev thiab yuav tsum muaj cua txias thiab tiv thaiv tus kheej thaum ua haujlwm. Kev raug TDI vapor tuaj yeem ua rau khaus thiab ua pa.
MDI muaj qhov qis dua volatility thiab ua rau qis dua vapor concentrations nyob rau hauv ib txwm ua tej yam kev mob. Raws li qhov tshwm sim, MDI prepolymers feem ntau suav hais tias muaj kev nyab xeeb dua los tuav thiab thauj.
TDI prepolymer feem ntau siv hauv:
Mos polyurethane elastomers
Flexible industrial Cheebtsam
Adhesives thiab sealants
Cov ntaub ntawv khau
Cov ntawv thov xav tau kev hloov pauv siab
MDI prepolymer feem ntau siv hauv:
Polyurethane rollers
Kev lag luam log
Mining cov ntxaij vab tshaus
Hydraulic seals
Heavy-cov haujlwm elastomer
High -cov khoom siv cam khwb cia polyurethane
Daim ntawv thov yuav tsum tau zoo heev hnav tsis kam thiab mechanical zog
Yuav Ua Li Cas Xaiv Ntawm MDI thiab TDI Prepolymer?
Kev xaiv ntawm MDI thiab TDI prepolymers nyob ntawm qhov kev ua tau zoo ntawm cov khoom kawg.
Yog tias qhov yooj yim, qis viscosity thiab tus nqi ua haujlwm yog qhov kev txiav txim siab tseem ceeb, TDI prepolymers yuav yog qhov kev xaiv zoo tshaj.
Yog tias muaj zog ntau dua, kev txhuam tsis zoo, thermal stability, kev nyab xeeb thiab kav ntev, MDI prepolymers feem ntau yog qhov kev xaiv zoo dua.
Ob leeg MDI prepolymers thiab TDI prepolymers ua lub luag haujlwm tseem ceeb hauv kev lag luam polyurethane. TDI prepolymers muab kev ua tau zoo heev, kev ua haujlwm yooj yim thiab cov nqi sib tw, thaum MDI prepolymers muab lub zog zoo dua, hnav tsis kam, tiv thaiv tshav kub thiab kev nyab xeeb.
Xaiv cov polyurethane prepolymer uas tsim nyog yuav tsum tau ua tib zoo soj ntsuam ntawm cov txheej txheem ua, kev ua tau zoo thiab qhov kawg - siv daim ntawv thov. Nkag siab qhov sib txawv ntawm MDI thiab TDI prepolymers tuaj yeem pab cov tuam txhab ua kom zoo dua cov khoom lag luam thiab kev ua haujlwm ntau lawm.