Thermoplastic polyurethane (TPU)yog ntau yam elastomer nrog ntau yam ntawm txhua yam, ib puag ncig, thiab kev ua haujlwm. Nws cov yam ntxwv ua tau zoo ua rau nws tsim nyog rau cov ntawv thov xws li cov yeeb yaj kiab mos mus rau siab - lub zog siv tshuab.
Mechanical Properties
TPU muaj ntau yam hardness, los ntawm Shore A 60 mus rau Shore D 85, uas tuaj yeem hloov kho los ntawm kev hloov kho cov qauv- xws li qhov piv ntawm isocyanate, polyol, thiab chain extender. Qhov kev hloov pauv no tso cai rau TPU siv rau ntau yam kev siv, los ntawm cov yeeb yaj kiab muag mus rau lub zog khov.
TPU nthuav tawm siab elasticity thiab tensile lub zog: elongation ntawm kev tawg tuaj yeem ncav cuag 400% -800% lossis ntau dua, muab roj hmab - zoo li yooj. Lub zog tensile feem ntau yog nyob ntawm 20-60 MPa, nrog qee qhov siab - qib kev ua tau zoo tshaj 70 MPa, ua tau zoo dua ntau TPEs xws li SEBS- cov khoom siv.
Cov khoom siv kuj muab kev tsim kua muag zoo heev, feem ntau ntawm 40-120 kN / m, ua rau nws zoo tagnrho rau cov ntawv thov uas yuav tsum tau ua kom tawg, xws li cov khoom siv ua kis las lossis cov khoom siv conveyor. Nws qhov kev puas tsuaj yog qhov zoo tshaj plaws, feem ntau 3-5 npaug siab dua li cov roj hmab ntuj (Taber abrasion Performance index tsawg li 50-100 mg), haum rau khau khau, khau khiab, thiab cov ntsaws ruaj ruaj.
Environmental and Weather Resistance
TPU ua kom pom qhov ntsuas kub zoo: luv- lub sijhawm kev pabcuam tuaj yeem nyob ntawm -40℃txog 120 degree, nrog qee qhov hloov pauv muaj peev xwm ntawm 130-150℃. Rau kev siv sijhawm ntev -, TPU tseem nyob ruaj khov ntawm -30℃thiab 80 degree, ua tau zoo tshaj TPEs feem ntau.
TPU tseem tiv taus cov roj thiab tshuaj, suav nrog cov roj nplua nyeem, roj, thiab cov roj hydraulic, nrog rau kev ua tau zoo tshaj SEBS-raws li TPE. Txawm li cas los xij, nws tsis tshua muaj zog rau cov acids thiab cov hauv paus. Hydrolysis kuj txawv ntawm TPU hom: polyether-raws li TPU qhia tau hais tias zoo dua hydrolysis tsis kam rau qhov chaw ntub dej, thaum polyester-raws li TPU muaj cov roj zoo dua tab sis yuav degrade nyob rau hauv ntev - dej raug.
Kev laus kuj txawv ntawm hom. Aliphatic TPUs, xws li polyether- qib raws, tiv taus UV thiab oxidation zoo thiab tsis daj yooj yim, ua rau lawv haum rau kev siv sab nraum zoov xws li cable sheaths. Aromatic TPUs muaj zog dua txhua yam tab sis muaj ntau dua rau yellowing nyob rau hauv UV raug.
Cov khoom ua haujlwm
Raws li cov thermoplastic, TPU tuaj yeem ua tiav los ntawm kev txhaj tshuaj molding, extrusion, tshuab moulding, thiab calendering yam tsis muaj vulcanization, muab kev ua haujlwm siab. Nws cov viscosity yaj yog qhov kub thiab txias -sensitive, nrog kev ua haujlwm kub feem ntau yog li ntawm 180-230 degree, nyob ntawm qib. Ua tib zoo tswj qhov kub thiab txias yog tsim nyog kom tsis txhob degradation.
TPU kuj tau sib xws nrog ntau yam khoom siv yas xws li ABS thiab PC, tso cai rau overmolding thiab mos- cov qauv sib xyaw nyuaj, dav siv hauv xov tooj, tsheb kauj vab, thiab lwm yam khoom siv ntau-.
Qee qib TPU muaj qhov pom tseeb siab, tshwj xeeb tshaj yog polyether-raws li thiab aliphatic hom, nrog lub teeb xa mus txog 85%, haum rau cov khoom siv kho qhov muag thiab cov raj kho mob.
TPU yog ib puag ncig tus phooj ywg, halogen{0}}dawb, thiab ntau qib ua raws li FDA thiab RoHS cov qauv, ua rau lawv tsim nyog rau kev sib cuag zaub mov lossis kev siv tshuaj kho mob xws li infusion sets thiab tubing kho mob.