Waa maxay farqiga u dhexeeya TPU iyo PU?

Waa maxay faraqa u dhexeeyaTPUiyo PU?

Elastomer-ka polyurethane (TPU)

TPU (Thermoplastic Polyurethane Elastomer)waa nooc balaastig ah oo soo baxaya. Sababtoo ah farsamayntiisa wanaagsan, iska caabbinta cimilada, iyo saaxiibtinimo deegaanka, TPU waxaa si weyn loogu isticmaalaa warshadaha la xiriira sida qalabka kabaha, tuubooyinka, filimada, duubayaasha, fiilooyinka, iyo fiilooyinka.

Elastomer-ka thermoplastic-ka ee Polyurethane, oo sidoo kale loo yaqaan caagga thermoplastic polyurethane, oo loo soo gaabiyo TPU, waa nooc ka mid ah polymer-ka toosan ee (AB) n-block. A waa polyester ama polyester miisaankiisu sarreeyo (1000-6000), B-na waa diol oo ka kooban 2-12 atamka kaarboon silsilad toosan ah. Qaab-dhismeedka kiimikada ee u dhexeeya qaybaha AB waa diisocyanate, oo badanaa ku xiran MDI.

Cinjirka polyurethane ee Thermoplastic wuxuu ku tiirsan yahay isku xidhka haydarojiin ee isku xidhka ah ama isku xidhka fudud ee u dhexeeya silsiladaha macromolecular, labada qaab-dhismeed ee isku xidhka ah waa la beddeli karaa iyadoo heerkulku sii kordhayo ama hoos u dhacayo. Xaaladda dhalaalaysa ama xalka, xoogagga isku xidhka ah way daciifaan, ka dib qaboojinta ama uumi-baxa dareeraha, xoogagga isku xidhka ee xooggan ayaa isku xidha, iyagoo soo celinaya sifooyinka adag ee asalka ah.

Elastomers-ka thermoplastic-ka ee PolyurethaneWaxaa loo kala saari karaa laba nooc: polyester iyo polyether, oo leh walxo cad oo wareegsan ama tiirar ah oo aan caadi ahayn iyo cufnaan qaraabo ah oo ah 1.10-1.25. Nooca polyether wuxuu leeyahay cufnaan qaraabo ah oo ka hooseeya nooca polyester. Heerkulka kala-guurka galaaska ee nooca polyether waa 100.6-106.1 ℃, kan nooca polyester-na waa 108.9-122.8 ℃. Heerkulka jajabnaanta ee nooca polyether iyo nooca polyester-ka wuxuu ka hooseeyaa -62 ℃, halka iska caabbinta heerkulka hoose ee nooca ether-ka adag ay ka fiican tahay kan nooca polyester-ka.

Astaamaha ugu fiican ee polyurethane thermoplastic elastomers waa iska caabin aad u fiican oo xirasho ah, iska caabin ozone oo aad u fiican, adkeysi sare, xoog sare, dabacsanaan wanaagsan, iska caabin heerkul hooseeya, iska caabin saliid oo wanaagsan, iska caabin kiimiko, iyo iska caabin deegaan. Deegaannada qoyan, xasilloonida hydrolysis ee esters-ka polyether aad ayay uga badan tahay noocyada polyester-ka.

Elastomers-ka thermoplastic-ka ee Polyurethane waa kuwo aan sun ahayn oo aan ur lahayn, oo ku milma dareerayaasha sida methyl ether, cyclohexanone, tetrahydrofuran, dioxane, iyo dimethylformamide, iyo sidoo kale dareerayaasha isku dhafan ee ka kooban toluene, ethyl acetate, butanone, iyo acetone oo ku habboon cabbirkooda. Waxay muujiyaan xaalad aan midab lahayn oo hufan waxayna leeyihiin xasillooni kaydin oo wanaagsan.