Polyurethane muaj polyester hom thiab polyether hom ob hom, dawb irregular spherical los yog columnar hais, txheeb ze ntom 1.10-1.25, polyether hom zaub mov hose txheeb ze ntom yog me dua polyester hom. Polyether hom iav hloov kub ntawm 100.6-106.1 degree, polyester hom khoom noj hose iav hloov kub ntawm 108.9-122.8 degree . Lub brittleness kub ntawm polyether hom thiab polyester hom yog qis dua -62 degree, thiab qhov kub tsis kam ntawm polyether hom yog kev txhawj xeeb tshaj li polyester hom.
Polyurethane thermoplastic elastomer cov yam ntxwv zoo heev yog hnav tsis kam, zoo heev ozone kuj, hardness, siab zog, zoo elasticity, tsis kub tsis kam, zoo roj kuj, tshuaj tsis kam thiab ib puag ncig kev ua tau zoo, nyob rau hauv lub ntub ib puag ncig polyether hom ester hydrolysis stability deb tshaj li polyester hom. .
TPU (thermoplastic polyurethane elastomer) yog hom yas uas tshwm sim, vim TPU muaj cov txheej txheem zoo, huab cua tsis kam, kev tiv thaiv ib puag ncig, yog siv dav hauv cov khoom siv, cov raj (steel hlau hose, industrial nqus hose, TPU steel hlau zaub mov hose, polyurethane hose) , films, rollers, cables thiab xaim thiab lwm yam kev lag luam. Polyurethane thermoplastic elastomer, tseem hu ua thermoplastic polyurethane roj hmab, los yog TPU luv luv, yog ib tug (AB) n-block linear polymer, A yog ib tug siab molecular hnyav polyester los yog polyether, B yog ib tug diol uas muaj 2-12 ncaj saw carbon atoms, thiab cov qauv tshuaj ntawm cov AB saw ntu txuas nrog diisocyanate, feem ntau yog MDI. Thermoplastic polyurethane roj hmab yog cross-linked los ntawm intermolecular hydrogen bonding los yog maj mam cross-linked ntawm macromolecular chains, thiab ob tug cross-linked qauv yog reversible raws li qhov kub thiab txias nce los yog txo. Cov rog intermolecular tsis muaj zog nyob rau hauv lub xeev molten los yog daws, thiab muaj zog intermolecular rog tau koom ua ke dua tom qab txias los yog hnyav evaporation los kho cov khoom ntawm cov khoom qub.
Polyurethane thermoplastic elastomer yog non-toxic, tasteless, soluble nyob rau hauv cov kuab tshuaj xws li methylene ethylene, cyclohexanone, tetrahydrofuran, dioxane, dimethylformamide, thiab lwm yam. Nws kuj yog soluble nyob rau hauv ib tug sib tov ntawm toluene, ethyl acetate, butanone, acetone nyob rau hauv ib tug tsim nyog proportions. tsis muaj xim thiab pob tshab lub xeev, thiab muaj kev ruaj ntseg zoo.
PU polyurethane yog cov ntsiab lus dav dav rau cov khoom siv polymer uas tsim los ntawm cov tshuaj tiv thaiv ntawm diisocyanate lossis polyisocyanate nrog cov tebchaw nrog ntau dua 2 pawg hydroxyl, uas muaj ntau pawg NHCOO rov ua dua ntawm cov saw tseem ceeb. Feem ntau siv diisocyanates suav nrog toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), dicyclohexylmethane diisocyanate (HMDI), polymethylene polyphenyl polyisocyanate (PAPI), dicyclohexylmethane diisocyanate (PAPI) thiab lwm yam. rau qhov sib txawv hydroxyl Cheebtsam siv, lawv tuaj yeem muab faib ua ob pawg: hom polyester thiab hom polyether. Nws tuaj yeem siv rau hauv kev tsim cov khoom yas, hnav-resistant hluavtaws roj hmab cov khoom, hluavtaws fibers, tawv thiab mos ua npuas ncauj khoom, adhesives thiab coatings, thiab lwm yam.
TPU thiab PU yog tsim los ntawm tib yam khoom. Tab sis nyob rau hauv ua ob hom ntawm cov ntaub ntawv nplaum. Lawv tsis siv tib lub mis. Ob hom roj hmab no muab faib ua ntau yam khoom.
