Polyether-based TPU

Polyether-based TPUluhlobo lwethermoplastic polyurethane elastomer. Intshayelelo yayo ngesiNgesi imi ngolu hlobo lulandelayo:

### Ukubunjwa kunye ne-Synthesis Polyether-based TPU yenziwe ikakhulu ukusuka kwi-4,4′-diphenylmethane diisocyanate (MDI), i-polytetrahydrofuran (PTMEG), kunye ne-1,4-butanediol (BDO). Phakathi kwabo, i-MDI ibonelela ngesakhiwo esiqinileyo, i-PTMEG ibandakanya icandelo elithambileyo ukunika izinto eziphathekayo ngokuguquguquka, kwaye i-BDO isebenza njenge-chain extender ukwandisa ubude be-molecular chain. Inkqubo yokudibanisa kukuba i-MDI kunye ne-PTMEG iqala ukusabela ukwenza i-prepolymer, kwaye ke i-prepolymer ifumana i-reaction extension reaction nge-BDO, kwaye ekugqibeleni, i-TPU esekelwe kwi-polyether yenziwa phantsi kwesenzo se-catalyst.

### Iimpawu zoLwakhiwo Itsheyini yemolekyuli yeTPU ine-(AB)n-uhlobo lwebhloko yesakhiwo somgca, apho i-A yi-high-molecular-weight- polyether soft segment enobunzima bemolekyuli be-1000-6000, i-B ngokubanzi yi-butanediol, kwaye ubume bekhemikhali phakathi kwamatyathanga e-AB yi-diisocyanate.

### Izinto eziluncedo zokuSebenza -

**I-Hydrolysis Resistance egqwesileyo**: Ibhondi ye-polyether (-O-) inozinzo lweekhemikhali eziphezulu kakhulu kune-polyester bond (-COO-), kwaye akulula ukuphuka kunye nokunciphisa kwindawo yamanzi okanye eshushu kunye neyomanzi. Ngokomzekelo, kuvavanyo lwexesha elide kwi-80 ° C kunye ne-95% ye-humidity ehambelanayo, izinga lokugcinwa kwamandla e-tensile, i-TPU esekelwe kwi-polyether, idlula i-85%, kwaye akukho kuncipha okucacileyo kwinqanaba lokubuyisela i-elastic. - **I-Good Low-Temperature Elasticity**: Iqondo lokushisa lokutshintsha kweglasi (Tg) yecandelo le-polyether lisezantsi (ngokuqhelekileyo lingaphantsi -50 ° C), oku kuthetha ukubaiTPU esekwe polyetherusenako ukugcina unwebu olulungileyo kunye nokuguquguquka kwindawo yobushushu obuphantsi. Kwi-40 ° C yovavanyo lwempembelelo yobushushu obuphantsi, akukho nto i-brittle fracture, kwaye umehluko ekusebenzeni kokugoba ukusuka kwimeko yokushisa eqhelekileyo ingaphantsi kwe-10%. – **Ukunyangwa okuLungileyo kweMichiza kunye nokuNxhathisa kweMicrobial**:Polyether-based TPUinokunyamezela okulungileyo kwi-solvents ezininzi ze-polar (ezifana notywala, i-ethylene glycol, i-asidi ebuthakathaka kunye nezisombululo ze-alkali), kwaye ayiyi kudumba okanye ichithe. Ukongezelela, icandelo le-polyether alikwazi ukuchithwa lula yi-microorganisms (ezifana nesikhunta kunye neebhaktheriya), ngoko inokuphepha ukungaphumeleli kokusebenza okubangelwa ukukhukuliseka kwe-microbial xa isetyenziswe kumhlaba omanzi okanye kwindawo yamanzi. – **IiPropati zeMechanical eziBalanced**: Sithatha njengomzekelo, ukuqina kwayo eNxwemeni yi-85A, eyinxalenye yodidi lwee-elastomers ezinobulukhuni obuphakathi. Ayigcini nje kuphela i-elasticity ephezulu kunye nokuguquguquka kwe-TPU, kodwa inamandla okwaneleyo okwakhiwa, kwaye inokufikelela kwibhalansi phakathi "kokubuyisela i-elastic" kunye "nozinzo lwemilo". Amandla ayo okuqina anokufikelela kwi-28MPa, ubude bekhefu budlula i-500%, kwaye amandla okukrazula yi-60kN/m.

### Application Fields Polyether-based TPU isetyenziswa kakhulu kwiinkalo ezifana nonyango lwezonyango, iimoto, nangaphandle. Kwinkalo yezonyango, ingasetyenziselwa ukwenza i-catheters zonyango ngenxa ye-biocompatibility yayo efanelekileyo, ukuxhathisa i-hydrolysis kunye nokuxhatshazwa kwe-microbial. Kwintsimi yeemoto, ingasetyenziselwa i-hoses compartment hoses, izitywina zomnyango, njl. ngenxa yokukwazi ukumelana nobushushu obuphezulu kunye neendawo zokufuma, ubushushu obuphantsi kunye nokumelana ne-ozone. Kwintsimi yangaphandle, ifanelekile ukwenza iimbrane zangaphandle zamanzi, kwiindawo eziphantsi kweqondo lokushisa, njl.