Ntau tus neeg yuav khoom tshiab yuav muaj kev ntseeg siab xws li, yuav tsum xaiv polyether polyols lossis polyester polyols? Cia peb tham txog lawv qhov sib txawv thiab cov yam ntxwv niaj hnub no, kom cov neeg yuav khoom tuaj yeem xaiv raws li cov kev xav tau sib txawv.
Lub ntsiab sib txawv ntawm polyether polyols thiab polyester polyols yog:
1. Cov ntaub ntawv raw thiab synthesis txheej txheem
Polyether Polyols: Feem ntau cov molecular hnyav sib xyaw ua ke muaj cov nquag hydrogen (xws li ethylene glycol, thiab lwm yam) tau siv ua thawj zaug. Raws li kev nqis tes ua ntawm tus neeg sawv cev tshuaj, lawv tau tsim los ntawm lub nplhaib-}} ephlene oxide (po), thiab tetrahydrofuran (thf). Piv txwv li, nrog glycerol raws li tus pib, kev ntseeg polyms tuaj yeem tau los ntawm lub nplhaib {}}}}} ecesization ntawm epylene oxide.
Polyester Polyols: Feem ntau, lawv tau npaj los ntawm kev saib xyuas cov acidic polycondic (xws li ethyls glycol, 1,4-butanol, thiab lwm yam). Piv txwv li, adipic acid thiab ethylene glycoled engo polycondens raws qee yam kev mob los tsim cov polyethylene adipate polyol.
2. Molecular qauv qauv
Polyether Polyol: lub saw hlau tseem ceeb ntawm cov molecule txuas nrog los ntawm Ethere Bonds (-0-) thiab muaj ntau dua Ethere daim ntawv sib tw. Nws cov molecular chart yog hloov tau yooj yim thiab muaj tsawg stetic thaiv.
Polyester Polyol: lub saw hlau tseem ceeb ntawm cov molecule muaj cov pab pawg ester ({} beo-). Lub xub ntiag ntawm cov pab pawg ester muab cov saw molecular ib qho polarity thiab rigidity.
3. Tsos thiab Xeev
Polyether Polyol: feem ntau yog xim tsis muaj xim lossis lub teeb daj pob tshab kua nrog cov viscosity tsawg thiab zoo flucosity.
Polyester Polyol: Feem ntau yog tsis muaj xim rau lub teeb daj ua kua lossis cov tawv nqaij uas muaj zog. Nws cov viscosity feem ntau siab dua li ntawm polyether polyol, tshwj xeeb tshaj yog polyester polyol nrog lub luag haujlwm loj dua tuaj yeem nyob hauv lub xeev ruaj khov.