I-TPU esekelwe ku-Polyether

I-TPU esekelwe ku-Polyetheruhlobo lwei-thermoplastic polyurethane elastomerIsingeniso sayo sesiNgisi simi kanje:

### Ukwakheka Nokwenziwa I-TPU esekelwe kwi-polyether yenziwe kakhulu kusukela ku-4,4′-diphenylmethane diisocyanate (MDI), i-polytetrahydrofuran (PTMEG), kanye ne-1,4-butanediol (BDO). Phakathi kwazo, i-MDI inikeza isakhiwo esiqinile, i-PTMEG yakha ingxenye ethambile yokunikeza izinto ukuguquguquka, kanti i-BDO isebenza njengesandisi seketanga ukwandisa ubude beketanga lama-molecule. Inqubo yokwenza ukuthi i-MDI kanye ne-PTMEG ziqale zisabela ekwakheni i-prepolymer, bese i-prepolymer idlula ekusabeleni kweketanga ne-BDO, futhi ekugcineni, i-TPU esekelwe kwi-polyether yakhiwa ngaphansi kwesenzo se-catalyst.

### Izici Zesakhiwo Uchungechunge lwama-molecule lwe-TPU lunesakhiwo esiqondile se-(AB)n-type block, lapho i-A iyisigaba esithambile se-polyether esinesisindo sama-molecule esiphezulu esinesisindo sama-molecule esingu-1000-6000, i-B ngokuvamile iyi-butanediol, kanti isakhiwo samakhemikhali phakathi kwamaketanga e-AB siyi-diisocyanate.

### Izinzuzo Zokusebenza -

**Ukumelana Okuhle Kakhulu Nokushiswa Kwe-Hydrolysis**: Isibopho se-polyether (-O-) sinokuzinza kwamakhemikhali okuphezulu kakhulu kunesibopho se-polyester (-COO-), futhi akulula ukusiphula nokusichitha emanzini noma endaweni eshisayo nenomswakama. Isibonelo, esivivinyweni sesikhathi eside ku-80°C kanye nomswakama ohlobene ongu-95%, izinga lokugcina amandla okunamathela, i-TPU esekelwe ku-polyether, lidlula u-85%, futhi akukho ukwehla okusobala kwesilinganiso sokubuyisa ukunwebeka. – **Ukunwebeka Okuhle Kokushisa Okuphansi**: Izinga lokushisa lokuguquka kwengilazi (Tg) lesigaba se-polyether liphansi (ngokuvamile ngaphansi kuka--50°C), okusho ukuthii-TPU esekelwe ku-polyetherisakwazi ukugcina ukuguquguquka okuhle kanye nokuguquguquka endaweni enokushisa okuphansi. Esivivinyweni somthelela wokushisa okuphansi esingu-40°C, akukho mkhuba wokuphuka okuqhekeka, futhi umehluko ekusebenzeni kokugoba kusuka esimweni sokushisa esijwayelekile ungaphansi kuka-10%. – **Ukumelana Okuhle Kwamakhemikhali Nokugqwala kanye Nokumelana Namagciwane**:I-TPU esekelwe ku-PolyetherIyakwazi ukubekezelela kahle izinyibilikisi eziningi ze-polar (njenge-alcohol, i-ethylene glycol, izixazululo ze-acid ebuthakathaka kanye ne-alkali), futhi ngeke ivuvuke noma incibilike. Ngaphezu kwalokho, ingxenye ye-polyether ayiboli kalula yizilokazane ezincane (njengesikhunta namabhaktheriya), ngakho-ke ingagwema ukwehluleka kokusebenza okubangelwa ukuguguleka kwamagciwane uma isetshenziswa enhlabathini enomswakama noma endaweni enamanzi. – **Izakhiwo Zomshini Ezilinganiselayo**: Uma sibheka isibonelo, ubulukhuni bayo be-Shore bungu-85A, obuyingxenye yesigaba sama-elastomer obuqinile obuphakathi nendawo. Ayigcini nje ngokugcina ukuqina okuphezulu nokuguquguquka okuvamile kwe-TPU, kodwa futhi inamandla anele esakhiwo, futhi ingafinyelela ibhalansi phakathi “kokululama kwe-elastic” kanye “nokuqina kwesimo”. Amandla ayo okudonsa angafinyelela ku-28MPa, ukunwebeka lapho ikhefu lidlula u-500%, kanti amandla okudabuka angama-60kN/m.

### Izinkambu Zokusetshenziswa I-TPU esekelwe kwi-polyether isetshenziswa kabanzi emikhakheni efana nokwelashwa kwezokwelapha, ezimotweni, nangaphandle. Emkhakheni wezokwelapha, ingasetshenziswa ukwenza ama-catheter ezokwelapha ngenxa yokuhambisana kwayo okuhle kwezinto eziphilayo, ukumelana ne-hydrolysis kanye nokumelana namagciwane. Emkhakheni wezimoto, ingasetshenziswa kumapayipi ezingxenye zenjini, izivalo zeminyango, njll. ngenxa yekhono layo lokubekezelela izindawo ezinokushisa okuphezulu kanye nomswakama, ukuqina kwezinga lokushisa eliphansi kanye nokumelana ne-ozone. Emkhakheni wangaphandle, ifaneleka ukwenza ama-membrane angaphandle angangeni manzi, ezindaweni ezinokushisa okuphansi, njll.