TPU e hangai ana ki te polyether

TPU e hangai ana ki te polyetherhe momo oelastomer polyurethane kirihou weraKo tōna kupu whakataki reo Pākehā e whai ake nei:

### Te Hanganga me te Hanganga Ko te TPU e ahu mai ana i te polyether ka hangaia mai i te 4,4′-diphenylmethane diisocyanate (MDI), te polytetrahydrofuran (PTMEG), me te 1,4-butanediol (BDO). I roto i ēnei, ka whakaratohia e te MDI he hanganga pakari, ko te PTMEG te wāhanga ngohengohe hei whakawhiwhi i te rauemi ki te ngāwari, ā, ko te BDO te mea hei whakaroa mekameka hei whakanui ake i te roa o te mekameka ngota. Ko te tukanga hangahanga ko te tauhohenga tuatahi a MDI me te PTMEG ki te hanga i tētahi prepolymer, kātahi ka pāngia te prepolymer e tētahi tauhohenga whakaroa mekameka me te BDO, ā, i te mutunga, ka hangaia te TPU e ahu mai ana i te polyether i raro i te mahi a tētahi whakakorikori.

### Ngā Āhuatanga Hanganga He hanganga poraka momo-(AB)n te mekameka ngota o te TPU, ko A he wāhanga ngohengohe polyether taumaha-ngota teitei me te taumaha ngota o te 1000-6000, ko B he butanediol te tikanga, ā, ko te hanganga matū i waenga i ngā mekameka AB he diisocyanate.

### Ngā Painga Mahi -

**Ātete Wairewa Tino Pai**: He nui ake te pumau matū o te here polyether (-O-) i te here polyester (-COO-), ā, kāore e ngāwari te whati me te pirau i roto i te wai, i te taiao wera me te makuku rānei. Hei tauira, i roto i te whakamātautau roa i te 80°C me te 95% te makuku whanaunga, ko te tere pupuri kaha kume, he TPU e hangai ana ki te polyether, neke atu i te 85%, ā, kāore he hekenga kitea o te tere whakaora tere. – **Te Rerenga Mahana-Iti Pai**: He iti ake te pāmahana whakawhiti karāhe (Tg) o te wāhanga polyether (kei raro iho i te -50°C), ko te tikangaTPU e hangai ana ki te polyetherka taea tonu te pupuri i te ngāwari me te ngāwari i roto i te taiao pāmahana iti. I roto i te whakamātautau pānga pāmahana iti -40°C, kāore he āhuatanga pakaru pakarukaru, ā, ko te rerekētanga o te mahi piko mai i te āhua pāmahana noa he iti iho i te 10%. – **Te Ātete Pai ki te Waikura Matū me te Ātete ki ngā Moroiti**:TPU e hangai ana ki te polyetherHe pai te ātete ki te nuinga o ngā whakarewa porotaka (pēnei i te waipiro, te ethylene glycol, ngā otinga waikawa ngoikore me te alkali), ā, e kore e pupuhi, e memeha rānei. Hei tāpiri, kāore te wāhanga polyether e ngāwari te pirau e ngā moroiti (pēnei i te pokepokea ai me te huakita), nō reira ka taea te karo i te ngoikore o te mahi i puta mai i te horo o te moroiti ina whakamahia i roto i te oneone makuku, i te taiao wai rānei. – **Ngā Āhuatanga Mīhini Taurite**: Hei tauira, ko tōna pakeke takutai he 85A, e pā ana ki te kāwai o ngā elastomers pakeke waenga-teitei. Ehara i te mea ka mau tonu te ngāwari me te ngāwari o te TPU, engari he kaha hanganga anō hoki, ā, ka taea te whakatutuki i te taurite i waenga i te "whakaora ngāwari" me te "pūmautanga āhua". Ka taea e tōna kaha kume te eke ki te 28MPa, ko te roa i te wā whati neke atu i te 500%, ā, ko te kaha haehae he 60kN/m.

### Ngā Marae Whakamahinga He whānuitia te whakamahinga o te TPU polyether i roto i ngā mara pēnei i te maimoatanga hauora, ngā motuka, me ngā mahi o waho. I roto i te mara hauora, ka taea te whakamahi hei hanga catheter hauora nā te mea he pai te hototahi ki te koiora, te ātete ki te wai me te ātete ki te moroiti. I roto i te mara motuka, ka taea te whakamahi mō ngā ngongo wāhanga miihini, ngā hiri tatau, me ētahi atu nā te mea he kaha ki te tu atu ki ngā taiao pāmahana teitei me te haumākū, te ngāwari o te pāmahana iti me te ātete ki te ozone. I roto i te mara o waho, he pai mō te hanga kiriuhi ātete wai o waho, i roto i ngā taiao pāmahana iti, me ētahi atu.