Yintoni umahluko phakathi kwe-TPU kunye ne-PU?

Yintoni umahluko phakathiTPUkunye nePU?

I-TPU (i-polyurethane elastomer)

I-TPU (i-Thermoplastic Polyurethane Elastomer)luhlobo olusakhulayo lweplastiki. Ngenxa yokuqhubekeka kwayo kakuhle, ukumelana nemozulu, kunye nobuhlobo bendalo, iTPU isetyenziswa kakhulu kumashishini anxulumeneyo anje ngemathiriyeli yezihlangu, imibhobho, iifilimu, iirola, iintambo kunye neengcingo.

I-Polyurethane thermoplastic elastomer, ekwaziwa ngokuba yirabha ye-thermoplastic polyurethane, efinyeziweyo njenge-TPU, luhlobo lwe-(AB) ye-n-block linear polymer. A i-molecular weight (1000-6000) i-polyester okanye i-polyether, kunye ne-B i-diol equkethe i-2-12 i-athomu ye-carbon chain straight. Ubume bekhemikhali phakathi kwamacandelo e-AB yi-disocyanate, ngokuqhelekileyo ixhunywe yi-MDI.

Irabha ye-Thermoplastic polyurethane ixhomekeke kwi-intermolecular hydrogen bonding okanye i-mild cross-linking phakathi kwamatsheyina e-macromolecular, kwaye ezi zakhiwo zimbini zidibanisa umnqamlezo ziyakwazi ukuguqulwa ngokunyuka okanye ukuhla kweqondo lokushisa. Kwimeko etyhidiweyo okanye isisombululo, amandla e-intermolecular ayancipha, kwaye emva kokupholisa okanye ukuchithwa kwe-solvent, amandla anamandla e-intermolecular adibanisa kunye, ukubuyisela iipropati ze-original yasekuqaleni.

Polyurethane thermoplastic elastomersinokuthi ihlelwe kwiindidi ezimbini: i-polyester kunye ne-polyether, kunye ne-white irregular spherical okanye i-columnar particles kunye nokuxinana kwe-1.10-1.25. Uhlobo lwe-polyether lunoxinano oluphantsi olunxulumene nohlobo lwe-polyester. Ubushushu beglasi benguqu yohlobo lwepolyether yi-100.6-106.1 ℃, kwaye olo hlobo lwepolyester yi-108.9-122.8 ℃. Ubushushu be-brittleness bohlobo lwe-polyester kunye nohlobo lwe-polyester lungaphantsi kwe--62 ℃, ngelixa ukuxhathisa ubushushu obuphantsi bohlobo lwe-ether enzima lungcono kunohlobo lwe-polyester.

Iimpawu ezibalaseleyo ze-polyurethane thermoplastic elastomers zibalaseleyo ukumelana nokunxiba, ukuxhathisa okugqwesileyo kwe-ozone, ukuqina okuphezulu, ukomelela okuphezulu, ukuqina okuhle, ukumelana nobushushu obuphantsi, ukumelana ne-oyile elungileyo, ukuxhathisa imichiza, kunye nokuxhathisa kokusingqongileyo. Kwiindawo ezifumileyo, uzinzo lwe-hydrolysis ye-polyether esters ludlula kude olo lweentlobo ze-polyester.

I-polyurethane thermoplastic elastomers ayinayo ityhefu kwaye ayinavumba, inyibilika kwizinyibilikisi ezifana ne-methyl ether, i-cyclohexanone, i-tetrahydrofuran, i-dioxane, kunye ne-dimethylformamide, kunye nezinyibilikisi ezixubeneyo ezenziwe nge-toluene, i-ethyl acetate, i-butanone, kunye ne-acetone ngokomlinganiselo ofanelekileyo. Babonisa isimo esingenambala kunye nesicacileyo kwaye banozinzo oluhle lokugcina.