I-TPU esekwe kwiPolyether

I-TPU esekwe kwiPolyetherluhlobo lwei-thermoplastic polyurethane elastomerIntshayelelo yayo yesiNgesi yile ilandelayo:

### Ulwakhiwo kunye nokwenziwa kweTPU esekelwe kwiPolyether yenziwe kakhulu kwi-4,4′-diphenylmethane diisocyanate (MDI), i-polytetrahydrofuran (PTMEG), kunye ne-1,4-butanediol (BDO). Phakathi kwazo, i-MDI ibonelela ngesakhiwo esiqinileyo, i-PTMEG yenza icandelo elithambileyo lokunika izinto ukuguquguquka, kwaye i-BDO isebenza njengolwandiso lwetyathanga ukwandisa ubude betyathanga lemolekyuli. Inkqubo yokwenza kukuba i-MDI kunye ne-PTMEG ziqale ziphendule ukuze zenze i-prepolymer, kwaye emva koko i-prepolymer idlula kwi-chain extension reaction kunye ne-BDO, kwaye ekugqibeleni, i-TPU esekelwe kwi-polyether yenziwe phantsi kwesenzo se-catalyst.

### Iimpawu zoBume Ikhonkco le-molecular le-TPU linesakhiwo se-(AB)n-type block linear, apho i-A iyinxalenye ethambileyo ye-polyether enobunzima obuphezulu be-molecular enobunzima be-molecular obuyi-1000-6000, i-B ngokubanzi yi-butanediol, kwaye isakhiwo seekhemikhali phakathi kwe-AB chains yi-diisocyanate.

### Iingenelo Zokusebenza -

**Ukumelana Okugqwesileyo Kwe-Hydrolysis**: I-polyether bond (-O-) inozinzo oluphezulu kakhulu lweekhemikhali kune-polyester bond (-COO-), kwaye akulula ukuyiqhekeza nokuyonakalisa emanzini okanye kwindawo eshushu nefumileyo. Umzekelo, kuvavanyo lwexesha elide kwi-80°C kunye ne-95% yomswakama ohambelanayo, izinga lokugcina amandla okutsalwa, i-polyether-based TPU, lidlula i-85%, kwaye akukho kwehla okucacileyo kwizinga lokubuyisela i-elastic. – **Ukuqina Okuhle Kobushushu Obuphantsi**: Ubushushu botshintsho lweglasi (Tg) lwecandelo le-polyether buphantsi (ngesiqhelo ngaphantsi kwe--50°C), oko kuthetha ukubai-TPU esekwe kwi-polyetherisenokugcina ukuthamba okuhle kunye nokuguquguquka kwimeko-bume yobushushu obuphantsi. Kuvavanyo lwempembelelo yobushushu obuphantsi lwe--40°C, akukho nto ibonakalayo yokuqhekeka okubuthathaka, kwaye umahluko ekusebenzeni kokugoba ukusuka kwimeko yobushushu obuqhelekileyo ungaphantsi kwe-10%. – **Ukumelana Okuhle Kokugqwala Kweekhemikhali kunye Nokumelana Neentsholongwane**:I-TPU esekwe kwiPolyetherinokunyamezelana kakuhle nee-polar solvents ezininzi (ezifana notywala, i-ethylene glycol, i-acid ebuthathaka kunye ne-alkali solutions), kwaye ayizukudumba okanye inyibilike. Ukongeza, icandelo le-polyether aliboli lula ziintsholongwane (ezifana nomngundo kunye neebhaktheriya), ngoko ke linokuthintela ukungaphumeleli kokusebenza okubangelwa kukukhukuliseka kweentsholongwane xa lisetyenziswa kumhlaba ofumileyo okanye kwindawo enamanzi. – **Iimpawu zoMbane eziLungelelanisiweyo**: Umzekelo, ubunzima bayo be-Shore yi-85A, ekwicandelo le-elastomers yobunzima obuphakathi. Ayigcini nje ngokugcina ukuthamba okuphezulu kunye nokuguquguquka kwe-TPU, kodwa ikwanawo amandla aneleyo olwakhiwo, kwaye inokufikelela ulungelelwano phakathi "kokubuyiselwa kwe-elastic" kunye "nozinzo lwemilo". Amandla ayo okutsalwa anokufikelela kwi-28MPa, ubude xa kuqhekeka budlula i-500%, kwaye amandla okukrazula yi-60kN/m.

### Iintsimi zoSetyenziso I-TPU esekelwe kwi-Polyether isetyenziswa kakhulu kwiinkalo ezifana nonyango lwezonyango, iimoto, nangaphandle. Kwicandelo lezonyango, ingasetyenziselwa ukwenza ii-catheters zonyango ngenxa yokuhambelana kwayo kakuhle kwezinto eziphilayo, ukumelana ne-hydrolysis kunye nokumelana neentsholongwane. Kwicandelo lezithuthi, ingasetyenziselwa iipayipi zegumbi leenjini, izitywino zomnyango, njl.njl. ngenxa yokukwazi kwayo ukumelana neendawo ezinobushushu obuphezulu kunye nokufuma, ukuthamba okuphantsi kobushushu kunye nokumelana ne-ozone. Kwicandelo langaphandle, ifanelekile ukwenza ii-membrane zangaphandle ezingangeni manzi, kwiindawo ezinobushushu obuphantsi, njl.njl.