TPU yopangidwa ndi polyether

TPU yopangidwa ndi polyetherndi mtundu waThermoplastic polyurethane elastomer. Mawu ake oyamba mu Chingerezi ali motere:

### Composition and Synthesis Polyether-based TPU imapangidwa makamaka kuchokera ku 4,4′-diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), ndi 1,4-butanediol (BDO). Pakati pawo, MDI imapereka mawonekedwe okhwima, PTMEG imapanga gawo lofewa kuti lipereke zinthuzo mosavuta, ndipo BDO imakhala ngati unyolo wowonjezera kuti uwonjezere kutalika kwa unyolo wa maselo. Njira yophatikizira ndikuti MDI ndi PTMEG zimayamba kuchitapo kanthu kuti apange prepolymer, ndiyeno prepolymer imakumana ndi unyolo wowonjezera ndi BDO, ndipo pomaliza, TPU yopangidwa ndi polyether imapangidwa pansi pa chothandizira.

### Makhalidwe Apangidwe Maselo a TPU ali ndi (AB)n-type block linear structure, pomwe A ndi gawo lofewa la polyether lolemera kwambiri ndi molekyulu yolemera 1000-6000, B nthawi zambiri ndi butanediol, ndipo kapangidwe kake kake pakati pa unyolo wa AB ndi diisocyanate.

### Ubwino wa Kachitidwe -

**Kukaniza Kwabwino Kwambiri kwa Hydrolysis**: Chomangira cha polyether (-O-) chili ndi kukhazikika kwamankhwala kwapamwamba kwambiri kuposa chomangira cha poliyesitala (-COO-), ndipo sichosavuta kusweka ndikuwonongeka m'madzi kapena malo otentha ndi achinyontho. Mwachitsanzo, pakuyezetsa kwa nthawi yayitali pa 80 ° C ndi 95% chinyezi chachibale, mphamvu yosungira mphamvu yamphamvu, TPU yochokera ku polyether, imaposa 85%, ndipo palibe kuchepa koonekeratu kwa kuchira kwa elasticity. - **Good Low-Temperature Elasticity**: Kutentha kwa galasi (Tg) kwa gawo la polyether ndikotsika (nthawi zambiri kutsika -50 ° C), kutanthauza kutiTPU yopangidwa ndi polyetheramatha kukhalabe otanuka komanso osinthasintha m'malo otsika kwambiri. Mu -40 ° C kuyezetsa kwa kutentha kwapansi, palibe chodabwitsa cha fracture, ndipo kusiyana kwa kupindika kwa ntchito kuchokera ku kutentha kwabwino kumakhala kosakwana 10%. - **Kukaniza Kwabwino kwa Chemical Corrosion ndi Microbial Resistance **:TPU yopangidwa ndi polyetherali ndi kulolerana kwabwino kwa zosungunulira za polar (monga mowa, ethylene glycol, asidi ofooka ndi alkali solutions), ndipo sichidzatupa kapena kusungunuka. Kuphatikiza apo, gawo la polyether siliwola mosavuta ndi tizilombo tating'onoting'ono (monga nkhungu ndi mabakiteriya), kotero zimatha kupewa kulephera kwa magwiridwe antchito chifukwa cha kukokoloka kwa tizilombo toyambitsa matenda tikamagwiritsidwa ntchito m'dothi lachinyontho kapena madzi. - ** Katundu Wamakina Woyenera **: Potengera chitsanzo, kulimba kwake kwa M'mphepete mwa nyanja ndi 85A, komwe kuli m'gulu la ma elastomers olimba kwambiri. Sikuti amangokhalira kusinthasintha komanso kusinthasintha kwa TPU, komanso amakhala ndi mphamvu zokwanira, ndipo amatha kukwaniritsa pakati pa "elastic recovery" ndi "kukhazikika kwa mawonekedwe". Mphamvu yake yokhazikika imatha kufika 28MPa, elongation panthawi yopuma imaposa 500%, ndipo mphamvu ya misozi ndi 60kN / m.

### Application Fields Polyether-based TPU imagwiritsidwa ntchito kwambiri m'magawo monga chithandizo chamankhwala, magalimoto, ndi kunja. Pazachipatala, zitha kugwiritsidwa ntchito kupanga ma catheter azachipatala chifukwa cha biocompatibility yake yabwino, kukana kwa hydrolysis ndi kukana kwa tizilombo. M'munda wa magalimoto, angagwiritsidwe ntchito pa hoses ya chipinda cha injini, zisindikizo za pakhomo, ndi zina zotero chifukwa cha mphamvu zake zolimbana ndi kutentha kwakukulu ndi chinyezi, kutentha kwapansi ndi kukana kwa ozoni. M'munda wakunja, ndizoyenera kupanga zingwe zakunja zopanda madzi, m'malo otentha kwambiri, etc.