TPU yochokera ku polyether

TPU yochokera ku polyetherndi mtundu waelastomer ya polyurethane ya thermoplasticMawu oyamba a m'Chingelezi ndi awa:

### Kapangidwe ndi Kapangidwe TPU yochokera ku polyether imapangidwa makamaka kuchokera ku 4,4′-diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), ndi 1,4-butanediol (BDO). Pakati pawo, MDI imapereka kapangidwe kolimba, PTMEG imapanga gawo lofewa kuti lipatse zinthuzo kusinthasintha, ndipo BDO imagwira ntchito ngati chowonjezera unyolo kuti iwonjezere kutalika kwa unyolo wa mamolekyu. Njira yopangira ndi yakuti MDI ndi PTMEG zimayamba kuchitapo kanthu kuti zipange prepolymer, kenako prepolymer imadutsa mu chain extension reaction ndi BDO, ndipo pomaliza, polyether-based TPU imapangidwa pogwiritsa ntchito chothandizira.

### Makhalidwe a Kapangidwe kake Unyolo wa mamolekyu wa TPU uli ndi kapangidwe ka mzere wa (AB)n-type block, komwe A ndi gawo lofewa la polyether lolemera kwambiri la mamolekyulu ndi kulemera kwa mamolekyulu a 1000-6000, B nthawi zambiri ndi butanediol, ndipo kapangidwe ka mankhwala pakati pa unyolo wa AB ndi diisocyanate.

### Ubwino wa Kuchita Bwino -

**Kukana Kwabwino Kwambiri kwa Hydrolysis**: Chigwirizano cha polyether (-O-) chili ndi kukhazikika kwa mankhwala kwambiri kuposa chigwirizano cha polyester (-COO-), ndipo sichimasweka mosavuta ndikuwonongeka m'madzi kapena malo otentha komanso achinyezi. Mwachitsanzo, poyesa kwa nthawi yayitali pa 80°C ndi chinyezi cha 95%, kuchuluka kwa mphamvu yogwirira ntchito, TPU yochokera ku polyether, kumaposa 85%, ndipo palibe kuchepa koonekeratu kwa kuchuluka kwa elasticity recovery. – **Kutsika Kwabwino Kwambiri**: Kutentha kwa kusintha kwa galasi (Tg) kwa gawo la polyether kumakhala kotsika (nthawi zambiri pansi pa -50°C), zomwe zikutanthauza kutiTPU yochokera ku polyetherakhozabe kukhalabe otanuka komanso osinthasintha bwino pamalo otentha pang'ono. Mu mayeso otsika kutentha -40°C, palibe vuto la kusweka kwa brittle fracture, ndipo kusiyana kwa magwiridwe antchito opindika kuchokera ku kutentha kwabwinobwino ndi kochepera 10%. – **Kukana Kwabwino kwa Mankhwala ndi Kukana kwa Tizilombo Tating'onoting'ono**:TPU yochokera ku polyetherIli ndi kupirira bwino kwa zinthu zambiri zosungunulira za polar (monga mowa, ethylene glycol, asidi wofooka ndi alkali), ndipo siidzatupa kapena kusungunuka. Kuphatikiza apo, gawo la polyether silimawonongeka mosavuta ndi tizilombo toyambitsa matenda (monga nkhungu ndi mabakiteriya), kotero imatha kupewa kulephera kugwira ntchito komwe kumachitika chifukwa cha kuwonongeka kwa tizilombo toyambitsa matenda ikagwiritsidwa ntchito m'nthaka yonyowa kapena m'madzi. - **Makhalidwe Oyenera a Makina**: Mwachitsanzo, kuuma kwake kwa Shore ndi 85A, komwe kuli m'gulu la ma elastomer olimba apakatikati. Sikuti imangosunga kusinthasintha kwa TPU kokha, komanso ili ndi mphamvu yokwanira yomangira, ndipo imatha kukhala ndi mgwirizano pakati pa "kuchira kwa elastic" ndi "kukhazikika kwa mawonekedwe". Mphamvu yake yolimba imatha kufika 28MPa, kutalika kwake pakupuma kumaposa 500%, ndipo mphamvu yong'ambika ndi 60kN/m.

### Ntchito Magawo TPU yochokera ku polyether imagwiritsidwa ntchito kwambiri m'magawo monga chithandizo chamankhwala, magalimoto, ndi panja. Mu gawo lachipatala, ingagwiritsidwe ntchito kupanga ma catheter azachipatala chifukwa cha kugwirizana kwake bwino ndi zinthu zina, kukana hydrolysis ndi kukana tizilombo toyambitsa matenda. Mu gawo lagalimoto, ingagwiritsidwe ntchito pa mapayipi a injini, zitseko zotsekera, ndi zina zotero chifukwa cha kuthekera kwake kupirira kutentha kwambiri ndi chinyezi, kusinthasintha kwa kutentha kochepa komanso kukana ozoni. Mu gawo lakunja, ndi yoyenera kupanga ma nembanemba osalowa madzi akunja, m'malo otentha pang'ono, ndi zina zotero.