Polyurethane elastomers yog los thaiv cov polymers, uas yog, polyurethane macromolecules yog tsim los ntawm "segments mos" thiab "segments nyuaj" thiab tsim ib tug micro theem sib cais qauv.Cov ntu nyuaj (muab los ntawm isocyanates thiab cov saw txuas ntxiv) tau tawg mus rau hauv cov ntu ntu ntu ntu (muab los ntawm oligomer polyols) thiab ua lub luag haujlwm ntawm lub cev sib txuas cov ntsiab lus.Yog li, piv nrog lwm cov roj hmab hluavtaws (elastomers), polyurethane elastomers muaj zog zoo dua thiab hnav tsis kam, Siab elongation tseem tuaj yeem khaws cia thaum lub hardness siab.
Elastic polyurethane cov ntaub ntawv, hu ua "cov ntaub ntawv" nyob rau hauv txawv teb chaws, feem ntau muaj xws li tsoos polyurethane elastomer khoom, polyurethane yas khiav thiab lwm yam ntaub ntawv pavement, polyurethane waterproof coatings, nplaum, sealants, potting adhesives, thiab lwm yam., accounting txog li 40% ntawm cov tag nrho cov khoom ntawm polyurethane.Feem ntau ntawm cov khoom kho mob ntawm cov ntaub ntawv (dej-raws li thiab hnyav-raws li cov khoom tshem tawm cov dej thiab cov kuab tshuaj) yog cov ntaub ntawv uas tsis yog npuas elastic polyurethane.PU hluavtaws tawv cob, ib co coatings thiab adhesives yog cov kuab tshuaj los yog cov khoom aqueous, uas tuaj yeem suav hais tias yog cov ntaub ntawv polyurethane elastomer hauv kev nkag siab dav.Hauv kev nkag siab nqaim, polyurethane elastomer yog hais txog cam khwb cia polyurethane elastomer (CPU), thermoplastic polyurethane elastomer (TPU) thiab sib xyaw polyurethane elastomer (MPU), suav txog 10% lossis tsawg dua ntawm tag nrho cov polyurethane.CPU thiab TPU yog lub ntsiab polyurethane elastomers, thiab lawv qhov sib txawv nyob rau hauv yam xws li cov txheej txheem tsim khoom thiab cov saw txuas ntxiv.Hom tshuaj polyurethane elastomer, tseem hu ua "polyurethane roj hmab", belongs rau ib hom tshwj xeeb hluavtaws roj hmab.Kev ua haujlwm siab polyurethane elastomer yog cov khoom siv nrog kev hnav zoo tshaj plaws ntawm tag nrho cov khoom siv hluavtaws polymer.Nws yog lub npe hu ua "tus huab tais ntawm hnav tsis kam".Nws yog siv dav hauv ntau lub teb, thiab cov ntawv thov tshiab tseem nthuav dav.
Polyurethane elastomers tuaj yeem siv los hloov cov hlau, yas thiab cov roj hmab zoo tib yam hauv qee qhov chaw.
Piv nrog cov ntaub ntawv hlau, polyurethane elastomer muaj qhov zoo ntawm lub teeb yuag, tsis muaj suab nrov, tsis kam ua haujlwm, tsis muaj nqi ua haujlwm thiab acid corrosion kuj.Muab piv nrog cov yas, nws muaj qhov zoo ntawm kev ua haujlwm siab thiab siab hnav tsis kam.Piv nrog rau cov roj hmab zoo tib yam, polyurethane elastomer muaj qhov zoo ntawm hnav tsis kam, txiav tsis kam, tsim kua muag, muaj peev xwm muaj peev xwm, ozone tsis kam, yooj yim siv, potting thiab pouring, thiab dav hardness ntau yam.
Polyurethane elastomer yog ib qho tseem ceeb ntawm polyurethane.Tam sim no, nws cov nyiaj tau los ze li ntawm 10% ntawm tag nrho cov khoom siv ntawm polyurethane.Polyurethane elastomer yog siv los tsim txhua yam roj hmab log, conveyor siv, dej-resistant thiab siab resistant roj hmab hoses, sealing strips thiab rings, cable sheaths thiab ntau yam films.Cov khoom siv dav siv hauv hlau thiab hlau, papermaking, mining, machinery, printing thiab lwm yam lag luam.Polyurethane elastomer tuaj yeem hloov kho los ntawm lwm cov polymers, fibers, hmoov fillers, thiab lwm yam kom txo tau tus nqi thiab txhim kho kev ua haujlwm.
Post lub sij hawm: May-05-2022