Qhov sib txawv ntawm "CPU" thiab "TPU"
Txoj kev ua
CPU: Nws yog cov khoom siv ua haujlwm. Nws yog kho thiab tsim los ntawm cov tshuaj tiv thaiv ntawm prepomer thiab cov saw extender los yog crosslinking tus neeg saib xyuas nyob rau hauv tej yam kev mob los tsim ib tug peb - qhov mesh qauv. Feem ntau, cov txheej txheem pouring yog siv, xws li phau ntawv pouring, mechanical pouring, thiab lwm yam.
TPU: Nws yog cov khoom siv thermoplastic uas yog softened thiab ntws los ntawm cua sov, thiab ces txias thiab zoo li tus. Nws tuaj yeem ua tiav los ntawm kev txhaj tshuaj molding, extrusion, tshuab moulding thiab lwm yam thermoplastics.
Molecular qauv
CPU: Nws muaj cov pab pawg ua haujlwm reactive. Thaum lub sij hawm kho, cov pab pawg ua haujlwm no ua haujlwm nrog ib leeg los tsim cov khoom siv tshuaj lom neeg, yog li tsim peb - cov qauv mesh, thiab muaj cov tshuaj muaj zog sib cuam tshuam ntawm cov saw hlau molecular.
TPU: Cov saw hlau molecular feem ntau yog lub cev sib txuas. Cov qauv kob zoo sib xws yog tsim los ntawm micro- theem sib cais ntawm cov ntu tawv thiab mos. Thaum rhuab, lub cev crosslinking raug rhuav tshem, cov khoom yuav mos thiab ntws, thiab lub cev crosslinking lub xeev rov qab los tom qab txias.
Cov yam ntxwv ua haujlwm
CPU: Lub hardness ntau yam yog dav, thiab hnav tsis kam, roj tsis kam thiab lub zog txhua yam yog qhov zoo, tab sis cov txheej txheem ua haujlwm yog qhov nyuaj thiab cov khib nyiab nyuaj rau rov ua dua.
TPU: Nws muaj qhov ua tau zoo, elasticity, txias ua haujlwm thiab ua haujlwm fluidity. Cov khib nyiab tuaj yeem rov ua dua thiab rov ua dua, tab sis qhov kub thiab txias tsis kam yog qhov tsis zoo.
Molecular muaj pes tsawg leeg
CPU
Nws yog tsim los ntawm cov tshuaj tiv thaiv ntawm isocyanates (xws li diphenylmethane diisocyanate MDI; toluene diisocyanate TDI, thiab lwm yam) thiab polyols (xws li polyether polyols, polyester polyols, thiab lwm yam) los tsim ib prepomer. Cov saw hlau molecular ntawm prepomer muaj ib pawg isocyanate uas tsis muaj kev cuam tshuam (-NCO). Thaum lub sij hawm molding, pawg isocyanate ntxiv reacts nrog cov saw txuas ntxiv (xws li diols, diamines, thiab lwm yam) lossis tus neeg sawv cev sib txuas los tsim cov qauv sib txuas sib txuas.
TPU
Nws feem ntau yog tsim los ntawm cov tshuaj tiv thaiv ntawm diisocyanates (xws li MDI, TDI, thiab lwm yam), luv - saw diols (chain extenders) thiab ntev - saw diols (polyethers lossis polyester polyols). Ntawm lawv, ntev - saw diols tsim cov ntu muag muag, uas muab cov khoom siv luv luv thiab yooj yim thiab yooj yim. diols tsim cov ntu nyuaj, uas muab lub zog thiab hardness ntawm cov khoom.Cov ntu tawv thiab mos yog txheej txheem los ntawm covalent bonds los ua micro-theem sib cais qauv.