Los ntawm kev tiv thaiv- hnav cov khoom siv hauv ob sab hauv kuv mus rau cov khau ncaws pob elastic ntawm koj txhais taw; los ntawm qhov poob siab absorber ntawm lub tsheb mus rau cov yeeb yaj kiab tiv thaiv ntawm lub xov tooj ntawm tes npo- cov khoom no zoo li tsis sib xws, cov khoom tseem ceeb yuav yog polyurethane elastomers.
Tab sis nws yog tib yam li polyurethane, qee qhov "soften thaum rhuab, harden thaum txias", thiab qee qhov "tsis tuaj yeem hloov tau ib zaug tsim""Tom qab no, "ob tus tswv" hauv kev lag luam polyurethane yog "dazzling": cam khwb cia polyurethane prepromers (CPU) thiab thermoplastic polyurethane elastomers (TPU) !
Ua ntej nkag siab qhov sib txawv ntawm qhov tseem ceeb: "Ntawm- lub tsev phab ntsa" VS. "crayon shaping" Qhov tseem ceeb tshaj qhov sib txawv ntawm CPU thiab TPU yog muab zais rau hauv txoj kev ua - nws yog sib npaug rau ob qho sib txawv "lub tswv yim rau kev ua khoom": CPU: "Reaction curing party", ntawm -site "wall building" rau hauv lub network.
CPU yog "reactive pwm". Cov txheej txheem ua haujlwm zoo li kev sib xyaw cov cement ntawm qhov chaw los tsim phab ntsa
ua ntej, cov isocyanate thiab polyol yog reacted los ua ib tug "prepomer" (sib npaug rau "grout"), ces ib tug saw extender/crosslinking neeg sawv cev (sib npaug rau "steel bar") yog ntxiv, thiab cov tshuaj tiv thaiv tshwm sim nyob rau hauv cov pwm. Cov saw hlau molecular "tuav tes" nrog rau ib leeg los ua ib qho peb - cov qauv mesh- ib zaug kho thiab tsim, nws zoo li lub cib ntsa, thiab nws yuav tsis muag tom qab rov ua dua, thiab nws tsis tuaj yeem ua tiav ob zaug. Cov txheej txheem kev ua haujlwm feem ntau yog "kho", xws li phau ntawv nchuav rau hauv pwm, lossis cov tshuab ua haujlwm rau ntau lawm.
TPU: "Thermoplastic deformation party", uas tuaj yeem rov ua dua zoo li crayons
Nws cov saw molecular cia siab rau "nruab ntu" (xws li cov pob zeb me) thiab "nqe mos" (xws li roj hmab bands) los ua ib qho kev sib txuas ntawm lub cev "kob qauv" (cov ntu ntu yog "cov Islands tuaj me" thiab cov ntu mos yog "dej hiav txwv"). txhaj thiab extruded rau hauv ntau yam duab; Tom qab txias, "lub cev crosslinking" yog rov qab, thiab cov khoom hardens thiab cov ntaub ntawv. Ua kom yooj yim dua, TPU cov khib nyiab tuaj yeem rov ua dua thiab rov ua dua -ib yam li melting siv crayons los ua cov crayons tshiab.
Cov qauv molecular txawv heev: Qhov txawv ntawm kev ua cov txheej txheem ntawm "kab laug sab web" VS. "Island" yog rooted nyob rau hauv txawv molecular qauv:
CPU: Tom qab kho, nws yog peb - cov qauv mesh, zoo li lub vev xaib kab laug sab tuab. Cov saw hlau molecular tau ruaj khov los ntawm "tshuaj lom neeg hla- txuas cov ntawv cog lus", yog li nws ruaj khov heev tom qab teeb tsa thiab tsis ntshai ntawm cua sov thiab deformation.
TPU: Nws yog "kos qauv" nrog micro- theem sib cais. Cov ntu nyuaj tuaj ua ke los ua "cov koog me me", thiab cov ntu me me txuas nrog ua "dej hiav txwv".The "me me Islands" txuas nrog lub zog tsis sib xws (tsis yog tshuaj lom neeg cov ntawv cog lus), thiab "cov Islands tuaj me" tuaj yeem raug tshem tawm los ntawm cua sov, thiab "cov Islands tuaj me" tuaj yeem ua ke dua los ntawm kev txias.