Yintoni umahluko phakathi kweTPU kunye nePU?

Yintoni umahluko phakathiI-TPUkunye ne-PU?

I-TPU (i-polyurethane elastomer)

I-TPU (i-Thermoplastic Polyurethane Elastomer)luhlobo lweplastiki oluvelayo. Ngenxa yokukwazi kwayo ukucutshungulwa kakuhle, ukumelana nemozulu, kunye nobuhlobo nokusingqongileyo, i-TPU isetyenziswa kakhulu kumashishini anxulumene nayo afana nezixhobo zezihlangu, iipayipi, iifilimu, iirola, iintambo, kunye neentambo.

I-polyurethane thermoplastic elastomer, ekwaziwa ngokuba yi-thermoplastic polyurethane rubber, efinyeziweyo njenge-TPU, luhlobo lwe-(AB) n-block linear polymer. I-A yi-polyester okanye i-polyester enobunzima obuphezulu be-molecular (1000-6000), kwaye i-B yi-diol equlethe ii-athomu zekhabhoni ze-2-12 straight chain. Ulwakhiwo lwekhemikhali phakathi kwamacandelo e-AB yi-diisocyanate, edla ngokudityaniswa yi-MDI.

Irabha ye-polyurethane ye-thermoplastic ixhomekeke kwi-intermolecular hydrogen bonding okanye i-inter-linking encinci phakathi kwee-macromolecular chains, kwaye ezi zakhiwo zimbini ze-cross-linking ziyaguqulwa ngobushushu obunyukayo okanye obuhlayo. Kwimeko yokunyibilika okanye yesisombululo, amandla e-intermolecular ayancipha, kwaye emva kokupholisa okanye ukufuma kwe-solvent, amandla aqinileyo e-intermolecular adibana, abuyisele iimpawu ze-original solid.

Ii-elastomers ze-thermoplastic ze-polyurethaneZinokwahlulwa zibe ziintlobo ezimbini: i-polyester kunye ne-polyether, kunye namaqhekeza amhlophe angalinganiyo okanye angqukuva kunye noxinano oluhambelanayo lwe-1.10-1.25. Uhlobo lwe-polyether lunoxinano oluphantsi kunohlobo lwe-polyester. Ubushushu bokutshintsha kweglasi bohlobo lwe-polyether yi-100.6-106.1 ℃, kwaye olohlobo lwe-polyester yi-108.9-122.8 ℃. Ubushushu bokubuthathaka bohlobo lwe-polyether kunye nohlobo lwe-polyester bungaphantsi kune--62 ℃, ngelixa ukumelana nobushushu obuphantsi bohlobo lwe-hard ether kungcono kunohlobo lwe-polyester.

Iimpawu ezibalaseleyo ze-polyurethane thermoplastic elastomers kukumelana nokuguguleka okugqwesileyo, ukumelana ne-ozone egqwesileyo, ubulukhuni obuphezulu, amandla aphezulu, ukuthamba okuhle, ukumelana nobushushu obuphantsi, ukumelana neoyile elungileyo, ukumelana neekhemikhali, kunye nokumelana nokusingqongileyo. Kwiindawo ezifumileyo, ukuzinza kwe-hydrolysis yee-ester ze-polyether kudlula kakhulu oko kweentlobo ze-polyester.

Ii-elastomers ze-thermoplastic ze-polyurethane azinabungozi kwaye azinavumba, ziyanyibilika kwizinyibilikisi ezifana ne-methyl ether, i-cyclohexanone, i-tetrahydrofuran, i-dioxane, kunye ne-dimethylformamide, kunye nakwizinyibilikisi ezixutyiweyo ezenziwe yi-toluene, i-ethyl acetate, i-butanone, kunye ne-acetone ngomlinganiselo ofanelekileyo. Zibonisa imeko engenambala kwaye icacile kwaye zinozinzo oluhle lokugcina.