Qhov sib txawv tseem ceeb ntawm aliphatic thiab aromatic polyurethane yog tias aliphatic polyurethane muaj cov qauv saw whereas aromatic polyurethane muaj lub nplhaib qauv.
Polyurethane lossis PUR yog ib chav kawm loj tshaj plaws ntawm cov polymers uas muaj peev xwm hloov tau raws li cov ntawv thov. Cov ntaub ntawv no tuaj yeem yog thermosetting lossis thermoplastic. Tsis tas li ntawd, lawv tuaj yeem nruj, mos, lossis hloov tau, nyob ntawm cov qauv tshuaj. Cov ntaub ntawv polyurethane polymer los ntawm cov tshuaj tiv thaiv ntawm cov organic diisocyanate thiab diol compound.
YAliphatic Polyurethane yog dab tsi?
Aliphatic polyurethane lossis aliphatic acrylic polyurethane yog cov khoom siv polymer uas tsis muaj cov qauv uas muaj ntxhiab. Nws yog ib qho tseem ceeb raws li txheej txheej hauv kev lag luam thiab kev siv hauv tsev. Cov qauv tshuaj ntawm cov khoom siv polymer no tseem ceeb vim tias cov khoom siv no yog tawv thiab hloov tau. Yog li ntawd, cov khoom no yog ib qho additive rau ntau yam khoom kom tau ib tug check tiav. Feem ntau, cov khoom siv no yog siv rau sealants thiab coatings uas yog npaj rau kev siv sab nraud.
Thaum xav txog cov tshuaj pleev xim ntawm aliphatic polyurethane, nws muaj cov saw ntev ntawm rov ua cov molecules. Txij li cov saw hlau no tuaj yeem siv tshuaj lom neeg los ua kom ntau dua lossis tsawg dua thiab muaj zog, cov khoom siv no muaj ntau yam. Lub sij hawm aliphatic yog hais txog cov muaj pes tsawg leeg ntawm qhib-chain hydrocarbons.
Ntxiv mus, cov khoom no dries tawm mus rau ib tug tawv tiav, thiab nws yog heev resistant rau dej thiab UV rays. Yog li ntawd, cov khoom no tsis tig daj thaum raug tshav ntuj. Tsis tas li ntawd, cov khoom no muaj zog tensile siab thiab ntws maj mam. Yog li ntawd, peb tuaj yeem yooj yim siv cov khoom no los ua cov txheej txheem (raws li cov yeeb yaj kiab tuab). Txij li cov khoom no tau yooj yim khi nrog epoxy, peb tuaj yeem siv tau yooj yim rau ntawm epoxy li sealant. Ntxiv mus, cov khoom no yog muag nyob rau hauv gloss los yog matt tiav thiab nyob rau hauv ntau yam xim.
YAromatic Polyurethane yog dab tsi?
Aromatic polyurethane yog cov khoom siv polymer uas muaj cov qauv zoo nkauj, muaj ntxhiab tsw. Cov qauv ntawm aromatic polyurethane txawv ntawm aliphatic polyurethane raws li cov qauv ntawm cov isocyanate siv hauv kev tsim khoom. Yog hais tias isocyanate yog aromatic, ces cov khoom siv polymer ua aromatic. Cov tshuaj tsw qab tshaj plaws yog toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), thiab naphthalene diisocyanate (NDI). Ntawm no, toluene diisocyanate feem ntau yog siv los ua kev sib xyaw ntawm ob isomers. Feem ntau, TDI thiab MDI yog siv rau kev tsim cov thermoplastic elastomers thiab foams, tab sis lawv cov ntaub ntawv polymeric yog siv rau coatings, sealants, thiab adhesives.
Daim duab 01: Kev sib xyaw ntawm Aromatic Polyurethane
Aromatic polyurethane muaj qhov hloov pauv iav siab. Lawv yog cov tawv tawv heev, qhov aliphatic polyurethane muaj qhov hloov pauv iav qis thiab hloov tau yooj yim.
Qhov txawv ntawm Aliphatic thiab Aromatic Polyurethane yog dab tsi?
Qhov sib txawv tseem ceeb ntawm aliphatic thiab aromatic polyurethane yog tias aliphatic polyurethane muaj cov qauv saw thaum muaj ntxhiab polyurethane muaj lub nplhaib qauv. Yog li ntawd, aliphatic polyurethane tsis muaj cov nplhaib uas muaj ntxhiab thaum muaj ntxhiab polyurethane muaj cov nplhaib uas muaj ntxhiab. Tsis tas li ntawd, cov tshuaj tsw qab polyurethane muaj qhov kub hloov pauv iav thiab yog qhov nkig, qhov aliphatic polyurethane muaj qhov hloov pauv iav qis thiab hloov tau.
Cov lus hauv qab no qhia ntau qhov sib txawv ntawm aliphatic thiab aromatic polyurethane.
Summary – Aliphatic vs Aromatic Polyurethane
Qhov sib txawv tseem ceeb ntawm aliphatic thiab aromatic polyurethane yog tias aliphatic polyurethane muaj cov qauv saw thaum muaj ntxhiab polyurethane muaj lub nplhaib qauv. Ntxiv mus, aromatic polyurethane muaj lub iav hloov pauv kub thiab yog qhov nkig, thaum aliphatic polyurethane muaj qhov hloov pauv iav qis thiab hloov tau.
