HQEE yog cov saw hlau zoo tshaj plaws rau TPUs
Kev sib cais ntau dua thiab siab dua ntawm kev sib txuas ntawm hydrogen nyob rau hauv qhov nyuaj ntawm HQEE-MDI polyurethanes yog qhov zoo tagnrho rau cov ntawv thov thermoplastic polyurethane (TPU), ua rau cov elastomers uas nthuav tawm cov khoom siv siab tshaj plaws thiab kev ua haujlwm thermal. Lub Tg ntawm PTMEG 1000/MDI/HQEE TPU tau tshaj tawm raws li -48 degree ; lub Tg ntawm ib PBA 1000/MDI/HQEE TPU yog -30 degree, yog li qhia tau hais tias ib tug high degree ntawm microphase sib cais.
Hauv cov txheej txheem thermoplastic polyurethane (TPU), un-crosslinked HQEE-MDI domains tuaj yeem yaj thiab yuav ntws ntawm qhov kub siab kom tso cai rau kev ua cov thermoplastic. Qhov sib txuam nyuaj ntu hloov kho thaum txias, tsim cov tawv elastomeric muaj pes tsawg leeg. Raws li cov txiaj ntsig ntawm DSC, HQEE txuas ntxiv ua rau kwv yees li 30 degree siab dua ntu ntu melting kub piv rau 1,4-BDO elastomers. HQEE-MDI systems feem ntau hloov BDO-PPD TPUs kom tau txais cov khoom zoo xws li thermal thiab dynamic kev ua tau zoo.
HQEE yog cov saw txuas ntxiv ntawm kev xaiv hauv kev thov cov ntawv thov polyurethane
Cov ntawv thov piv txwv rau HQEE suav nrog cov log tsheb thiab cov log tsheb; skateboard, nyob rau hauv-kab skate, thiab kev lom zem chaw ua si log; cov yeeb nkab hauv ob sab phlu thiab coatings; rollers, industrial yob npog, gaskets, roj-field seals, conveyor siv; roj teb thiab cov khoom siv mining, cyclone liners; thiab lwm yam kev ua tau zoo kawg siv.
Cov khoom zoo heev ntawm PTMEG polyether-based HQEE-MDI elastomers yog qhov tseem ceeb hauv kev siv xws li kev ua haujlwm siab, lub log, thiab cov log tsheb uas tsis tshua muaj cua sov (hysteresis) yog qhov tseem ceeb nyob rau hauv dynamic flex tej yam kev mob.
HQEE-MDI elastomer series piv tau zoo nrog ntau qhov kev ua tau zoo pom hauv MOCA-TDI systems. Tsis tas li ntawd, HQEE-MDI elastomers qhia kev txhim kho cov khoom muaj zog, rov qab, thiab lub zog tsim kua muag.
Lub siab melting point ntawm HQEE yuav tsum tau ua ntau dua kub
Muaj qee qhov teeb meem cuam tshuam nrog kev ua HQEE vim nws qhov siab melting point, ~ 98 degree (~ 208 degree F), thiab qhov tseeb tias HQEE tsis supercool (HQEE yuav crystallize sai sai hauv qab nws melting point). Raws li, nws yog ib qho tseem ceeb rau uniformly cua sov thiab me ntsis agitate HQEE nyob rau hauv lub melting tank thiab preheat lub prepolymer rau 90 degree (194 degree F) los yog saum toj no ua ntej sib tov nyob rau hauv HQEE. Tsis tas li ntawd, tag nrho cov kab hloov HQEE yuav tsum tau ua kom sov rau 110 degree (230 degree F) thiab rwb thaiv tsev kom tiv thaiv qhov chaw txias uas yuav ua rau HQEE crystallize hauv cov kab thiab ua rau muaj qhov sib xyaw tsis raug. Qhov kub ntawm cov pwm yuav tsum yog 110 degree (230 degree F) lossis siab dua los tiv thaiv qhov tsis xws luag hauv cov khoom cam khwb cia.
"Starring" ntawm qhov chaw ntawm qhov chaw tuaj yeem pom thaum ua HQEE. Qhov tshwm sim no tau raug ntaus nqi mus rau theem ntawm cov tshuaj tiv thaiv cov khoom ntawm HQEE thiab dawb MDI monomer, tshwj xeeb tshaj yog nyob rau hauv pwm qhov chaw ntawm qhov kub thiab txias qis dua 110 degree (230 degree F). Nws tau raug tshaj tawm tias tsis pub dawb MDI prepolymers pom muaj qhov qis dua rau kev ua yeeb yam vim yog MDI monomer cov ntsiab lus qis dua.