TPU yakavakirwa paPolyether

TPU yakavakirwa paPolyetherrudzi rweelastomer yethermoplastic polyurethaneSumo yayo muChirungu ndeiyi inotevera:

### Kuumbwa uye Kugadzirwa kweTPU yakavakirwa paPolyether inonyanya kugadzirwa kubva ku4,4′-diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), uye 1,4-butanediol (BDO). Pakati padzo, MDI inopa chimiro chakasimba, PTMEG inoumba chikamu chakapfava chekupa zvinhu kushanduka, uye BDO inoshanda sechain extender kuwedzera urefu hwecheni yemamorekuru. Maitiro ekugadzira ndeekuti MDI nePTMEG zvinotanga zvaita kuti zvigadzire prepolymer, uye prepolymer inopinda mucheni extension reaction neBDO, uye pakupedzisira, polyether-based TPU inoumbwa pasi pechiito checatalyst.

### Hunhu hweMaumbirwo Cheni yemamorekuru yeTPU ine chimiro che (AB)n-type block linear structure, apo A iri chikamu chepolyether chakapfava chine huremu hwemamorekuru ane huremu hwe1000-6000, B inowanzova butanediol, uye chimiro chemakemikari chiri pakati pemaketani eAB idiisocyanate.

### Zvakanakira Kushanda -

**Kuramba Kushanda Zvakanaka kweHydrolysis**: Chisungo chepolyether (-O-) chine kugadzikana kwakanyanya kwemakemikari kupfuura chisungo chepolyester (-COO-), uye hachisi nyore kupwanya nekuora mumvura kana munzvimbo inopisa uye ine hunyoro. Semuenzaniso, mukuyedza kwenguva refu pa80°C uye 95% hunyoro, chiyero chekuchengetedza simba rekusimba, iyo polyether-based TPU, inodarika 85%, uye hapana kudzikira kuri pachena kwechiyero chekudzoreredza elastic. – **Kusimba Kwakanaka Kwekupisa Kushoma**: Tembiricha yekuchinja kwegirazi (Tg) yechikamu chepolyether yakaderera (kazhinji iri pasi pe -50°C), zvinoreva kutiTPU yakavakirwa papolyetherinogona kuramba ichikwanisa kutwasuka zvakanaka uye kuchinjika zvakanaka munzvimbo ine tembiricha yakaderera. Mubvunzo we -40°C wekupisa kwakaderera, hapana chiitiko chekutyoka kweganda, uye musiyano wekushanda kwekukombama kubva pakupisa kwakajairika uri pasi pe10%. - **Kuramba Kuora Kwemakemikari Uye Kuramba Kudiki**:TPU yakavakirwa paPolyetherine kutsungirira kwakanaka kune zvakawanda zvinonyungudutsa (senge doro, ethylene glycol, weak acid uye alkali solutions), uye haizozvimbi kana kunyungudika. Pamusoro pezvo, chikamu chepolyether hachibviswi nyore nyore netupukanana (senge chakuvhuvhu nemabhakitiriya), saka chinogona kudzivirira kutadza kushanda kunokonzerwa nekukukurwa kwetupukanana kana chikashandiswa muvhu rine hunyoro kana munzvimbo ine mvura. – **Zvinhu Zvakaringana Zvekugadzira**: Semuenzaniso, kuoma kwayo kweShore i85A, iyo iri muchikamu che elastomers dzehunyoro hwepakati nepakati. Haingochengetedzi chete kusimba kwakajairika uye kuchinjika kweTPU, asiwo ine simba rakakwana rekuvaka, uye inogona kuwana chiyero pakati pe "elastic recovery" uye "kugadzikana kwechimiro". Simba rayo rekusimba rinogona kusvika 28MPa, kureba pakuputsika kunopfuura 500%, uye simba rekubuda kwebvudzi i60kN/m.

### Nzvimbo dzekushandisa TPU yakavakirwa paPolyether inoshandiswa zvakanyanya muminda yakadai sekurapa, mota, uye kunze. Muminda yekurapa, inogona kushandiswa kugadzira macatheter ekurapa nekuda kwekushanda kwayo zvakanaka, kuramba hydrolysis uye kuramba mabhakitiriya. Muminda yemotokari, inogona kushandiswa kumahosi emumainjini, zvisimbiso zvemasuo, nezvimwewo nekuda kwekugona kwayo kutsungirira tembiricha yakakwira uye hunyoro, kusimba kwetembiricha yakaderera uye kuramba ozone. Muminda yekunze, yakakodzera kugadzira mamembrane ekunze asingapindi mvura, munzvimbo dzine tembiricha yakaderera, nezvimwewo.