Uyini umehluko phakathi kwe-TPU ne-PU?

Uyini umehluko phakathiI-TPUkanye ne-PU?

I-TPU (i-polyurethane elastomer)

I-TPU (i-Thermoplastic Polyurethane Elastomer)iwuhlobo lwepulasitiki oluvelayo. Ngenxa yokusebenziseka kwayo kahle, ukumelana nesimo sezulu, kanye nobungane bemvelo, i-TPU isetshenziswa kabanzi ezimbonini ezihlobene njengezinto zezicathulo, amapayipi, amafilimu, ama-roller, izintambo, kanye nezintambo.

I-polyurethane thermoplastic elastomer, eyaziwa nangokuthi irabha ye-thermoplastic polyurethane, efushaniswe ngokuthi i-TPU, uhlobo lwe-(AB) n-block linear polymer. I-A iyi-polyester noma i-polyester enesisindo sama-molecule aphezulu (1000-6000), kanti i-B iyi-diol equkethe ama-athomu e-carbon angu-2-12 aqondile. Isakhiwo samakhemikhali phakathi kwezingxenye ze-AB yi-diisocyanate, evame ukuxhunywa yi-MDI.

Irabha ye-polyurethane ye-thermoplastic incike ekuhlanganiseni kwe-hydrogen phakathi kwama-molecule noma ekuhlanganiseni okuthambile phakathi kwamaketanga amakhulu, futhi lezi zakhiwo ezimbili ezihlanganisayo ziyaguqulwa ngokushisa okwandayo noma okwehlayo. Esimweni esincibilikisiwe noma esixazululiwe, amandla aphakathi kwama-molecule ayancipha, futhi ngemva kokupholisa noma ukuhwamuka kwe-solvent, amandla aphakathi kwama-molecule aqinile ayahlangana, abuyisele izakhiwo ze-solid yokuqala.

Ama-elastomer e-thermoplastic e-polyurethanezingahlukaniswa ngezinhlobo ezimbili: i-polyester ne-polyether, enezinhlayiya ezimhlophe ezingajwayelekile eziyindilinga noma ezimakholomu kanye nobuningi obuphakathi kuka-1.10-1.25. Uhlobo lwe-polyether lunobuningi obuphakathi obuphansi kunohlobo lwe-polyester. Izinga lokushisa lokushintsha kwengilazi lohlobo lwe-polyether lingu-100.6-106.1 ℃, kanti elohlobo lwe-polyester lingu-108.9-122.8 ℃. Izinga lokushisa lokuphuka kohlobo lwe-polyether nohlobo lwe-polyester lingaphansi kuka--62 ℃, kanti ukumelana nokushisa okuphansi kohlobo lwe-hard ether kungcono kunohlobo lwe-polyester.

Izici ezivelele zama-elastomer e-thermoplastic e-polyurethane ukumelana okuhle kakhulu nokuguguleka, ukumelana okuhle kakhulu kwe-ozone, ubulukhuni obuphezulu, amandla aphezulu, ukuqina okuhle, ukumelana okuphansi kwezinga lokushisa, ukumelana okuhle kwamafutha, ukumelana kwamakhemikhali, kanye nokumelana kwemvelo. Ezindaweni ezinomswakama, ukuzinza kwe-hydrolysis kwama-ester e-polyether kudlula kakhulu okwezinhlobo ze-polyester.

Ama-elastomer e-thermoplastic e-polyurethane awayona into enobuthi futhi awanaphunga, ancibilika ezinyibilikisini ezifana ne-methyl ether, i-cyclohexanone, i-tetrahydrofuran, i-dioxane, ne-dimethylformamide, kanye nasezinyibilikisini ezixubile ezakhiwe yi-toluene, i-ethyl acetate, i-butanone, ne-acetone ngezilinganiso ezifanele. Abonisa isimo sokungabi nombala nokusobala futhi anokuqina okuhle kokugcina.