Kodi pali kusiyana kotani pakati pa TPU ndi PU?

Kodi pali kusiyana kotaniTPUndi PU?

TPU (polyurethane elastomer)

TPU (Thermoplastic Polyurethane Elastomer)ndi mitundu yosiyanasiyana ya pulasitiki. Chifukwa cha kusinthasintha kwake, kukana nyengo, komanso kuyanjana ndi chilengedwe, TPU imagwiritsidwa ntchito kwambiri m'mafakitale ofananirako monga zida za nsapato, mapaipi, makanema, zodzigudubuza, zingwe, ndi mawaya.

Polyurethane thermoplastic elastomer, yomwe imadziwikanso kuti thermoplastic polyurethane rabara, yofupikitsidwa ngati TPU, ndi mtundu wa (AB) n-block linear polima. A ndi molekyulu yolemera kwambiri (1000-6000) poliyesitala kapena poliyetha, ndipo B ndi diol yomwe ili ndi maatomu a kaboni 2-12 owongoka. Kapangidwe ka mankhwala pakati pa zigawo za AB ndi diisocyanate, nthawi zambiri zolumikizidwa ndi MDI.

Thermoplastic polyurethane rabara imadalira intermolecular hydrogen bonding kapena kulumikiza pang'ono pakati pa maunyolo a macromolecular, ndipo zida ziwirizi zolumikizira zimasinthidwa ndikuwonjezeka kapena kuchepa kwa kutentha. M'malo osungunuka kapena osungunuka, mphamvu za intermolecular zimafowoketsa, ndipo pambuyo pozizira kapena kusungunuka kwa zosungunulira, mphamvu zamphamvu za intermolecular zimagwirizanitsa pamodzi, kubwezeretsa katundu wa chiyambi cholimba.

Polyurethane thermoplastic elastomersZitha kugawidwa m'mitundu iwiri: poliyesitala ndi poliyesitala, yokhala ndi tinthu tating'onoting'ono tomwe timazungulira tomwe timazungulira tozungulira komanso kachulukidwe wa 1.10-1.25. Mtundu wa polyether uli ndi kachulukidwe kakang'ono kuposa mtundu wa polyester. Kutentha kwa galasi la polyether ndi 100.6-106.1 ℃, ndipo mtundu wa polyester ndi 108.9-122.8 ℃. Kutentha kwa brittleness kwa mtundu wa polyether ndi mtundu wa poliyesitala ndikotsika kuposa -62 ℃, pomwe kukana kwa kutentha kwamtundu wa ether wolimba kumakhala bwino kuposa mtundu wa poliyesitala.

Makhalidwe apamwamba a polyurethane thermoplastic elastomers ndi abwino kukana kuvala, kukana kwa ozoni, kulimba kwambiri, kulimba kwambiri, kukhazikika bwino, kutsika kwa kutentha, kukana mafuta bwino, kukana kwamankhwala, komanso kukana chilengedwe. M'malo achinyezi, kukhazikika kwa hydrolysis kwa polyether esters kumaposa mitundu ya polyester.

Polyurethane thermoplastic elastomers sizowopsa komanso zopanda fungo, zimasungunuka mu zosungunulira monga methyl ether, cyclohexanone, tetrahydrofuran, dioxane, ndi dimethylformamide, komanso zosungunulira zosakanikirana zopangidwa ndi toluene, ethyl acetate, butanone, ndi acetone molingana. Amawonetsa dziko lopanda mtundu komanso lowoneka bwino komanso amakhala ndi kukhazikika kosungirako bwino.