Incazelo emfushane:


  • Intengo ye-FOB eyinkomba:
    US $3,937
    / Ithani
  • Imbobo:China
  • Imigomo Yokukhokha:L/C, T/T, Western Union
  • I-CAS:51852-81-4
  • Imininingwane Yomkhiqizo

    Omaka bomkhiqizo

    Igama Lomkhiqizo:i-polyurethane

    Isakhiwo samangqamuzana omkhiqizo:

    i-polyurethane

     

    Izakhiwo Zekhemikhali:

    I-polyurethanes yaqala ukukhiqizwa futhi yaphenywa nguDkt. Otto Bayer ngo-1937. I-polyurethane iyi-polymer lapho iyunithi ephindaphindayo iqukethe i-urethane moiety.Ama-urethane aphuma kuma-carbamic acid akhona kuphela ngendlela yama-esters awo[15].Inzuzo enkulu ye-PU ukuthi uchungechunge alukhiwanga kuphela ama-athomu ekhabhoni kodwa kunalokho ama-heteroatom, umoya-mpilo, ikhabhoni ne-nitrogen[4].Ngezicelo zezimboni, inhlanganisela ye-polyhydroxyl ingasetshenziswa.Ngokufanayo, izinhlanganisela ze-nitrogen ezisebenza nge-poly-functional zingasetshenziswa ekuxhumaneni kwe-amide.Ngokushintsha nokushintshanisa i-polyhydroxyl ne-polyfunctional nitrogen compounds, ama-PU ahlukene angahlanganiswa[15].Ama-polyester noma ama-polyether resins aqukethe amaqembu e-hydroxyl asetshenziselwa ukukhiqiza i-polyesteror polyether-PU, ngokulandelana[6].Ukwehluka kwenani lokushintshwa kanye nesikhala phakathi nangaphakathi kwamaketango egatsha kukhiqiza ama-PU asuka kolayini ukuya kwengamagatsha futhi angu-9 avumelanayo kuya kokuqinile.I-Linear PUs isetshenziselwa ukwenza imicu nokubumba[6].Ama-PU aguquguqukayo asetshenziswa ekukhiqizeni ama-ejenti abophayo kanye nama-coatings[5].Amapulasitiki anegwebu aguquguqukayo futhi aqinile, akha iningi lama-PU akhiqizwayo, angatholakala ngezindlela ezahlukahlukene embonini[7].Kusetshenziswa ama-prepolymers aphansi we-molecular mass, kungakhiqizwa ama-block copolymers ahlukahlukene.Iqembu letheminali le-hydroxyl livumela amabhlogo ashintshanayo, abizwa ngokuthi amasegimenti, ukuthi afakwe ochungechungeni lwe-PU.Ukwehluka kulawa masegimenti kuholela kumazinga ahlukahlukene wamandla aqinile nokunwebeka.Amabhulokhi ahlinzeka ngesigaba sekristalu esiqinile futhi aqukethe i-chain extender abizwa ngokuthi amasegimenti aqinile[7].Lezo ezikhiqiza isigaba se-amorphous rubbery futhi equkethe i-polyester/polyether ibizwa ngokuthi amasegimenti athambile.Ngokwezentengiselwano, lawa ma-polymer block aziwa njenge-Segmented Pus

     

    Isicelo:

    I-polyurethane eguquguqukayo ngokuyinhloko iyisakhiwo esiqondile esine-thermoplasticity, esinokuzinza okungcono, ukumelana namakhemikhali, ukuqina kanye nezakhiwo zemishini kunegwebu le-PVC, elinokuhlukahluka okuncane kokucindezela.Inokufakwa kahle kwe-thermal, ukufakwa komsindo, ukumelana nokushaqeka kanye nezakhiwo ezilwa nobuthi.Ngakho-ke, isetshenziswa njengokupakisha, ukwahlukanisa umsindo nezinto zokuhlunga.Ipulasitiki ye-polyurethane eqinile ilula, ifaka umsindo, i-thermal insulation ephezulu, ukumelana namakhemikhali, izindawo ezinhle zikagesi, ukucutshungulwa kalula, nokumunca amanzi aphansi.Isetshenziswa kakhulu njengempahla yesakhiwo yokwakha, imoto, imboni yezindiza, ukufakwa kokushisa nokushisa okushisayo.Ukusebenza kwe-polyurethane elastomer phakathi kwepulasitiki nerabha, ukumelana nowoyela, ukumelana nokugqoka, ukumelana nokushisa okuphansi, ukumelana nokuguga, ubulukhuni obuphezulu, ukunwebeka.Isetshenziswa kakhulu embonini yezicathulo kanye nemboni yezokwelapha.I-polyurethane nayo ingenziwa ibe yizinto zokunamathisela, okokunamathela, isikhumba sokwenziwa, njll.

    I-polyurethane




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