Kodi kusiyana pakati pa TPU ndi PU ndi kotani?

Kodi pali kusiyana kotani pakati paTPUndi PU?

TPU (polyurethane elastomer)

TPU (Thermoplastic Polyurethane Elastomer)ndi mtundu watsopano wa pulasitiki. Chifukwa cha kusinthasintha kwake, kukana nyengo, komanso kusamala chilengedwe, TPU imagwiritsidwa ntchito kwambiri m'mafakitale ena monga nsapato, mapaipi, mafilimu, ma rollers, zingwe, ndi mawaya.

Elastomer ya polyurethane thermoplastic, yomwe imadziwikanso kuti thermoplastic polyurethane rabara, yomwe imafupikitsidwa kuti TPU, ndi mtundu wa (AB) n-block linear polymer. A ndi polyester yolemera kwambiri (1000-6000) kapena polyether, ndipo B ndi diol yokhala ndi maatomu a kaboni 2-12 olunjika. Kapangidwe ka mankhwala pakati pa magawo a AB ndi diisocyanate, nthawi zambiri yolumikizidwa ndi MDI.

Mphira wa polyurethane wa thermoplastic umadalira mgwirizano wa hydrogen pakati pa mamolekyulu kapena kulumikizana pang'ono pakati pa ma macromolecular chains, ndipo mapangidwe awiriwa olumikizana amatha kusinthika ndi kutentha komwe kumawonjezeka kapena kuchepa. Mu mkhalidwe wosungunuka kapena wa yankho, mphamvu zapakati pa mamolekyulu zimafooka, ndipo pambuyo pozizira kapena kusungunuka kwa solvent, mphamvu zapakati pa mamolekyulu zimalumikizana, ndikubwezeretsa mawonekedwe a cholimba choyambirira.

Ma elastomer a polyurethane thermoplasticZingagawidwe m'magulu awiri: polyester ndi polyether, yokhala ndi tinthu toyera tosakhazikika kapena tozungulira komanso kuchuluka kwa 1.10-1.25. Mtundu wa polyether uli ndi kuchuluka kochepa poyerekeza ndi mtundu wa polyester. Kutentha kwa kusintha kwa galasi kwa mtundu wa polyether ndi 100.6-106.1 ℃, ndipo kwa mtundu wa polyester ndi 108.9-122.8 ℃. Kutentha kwa kufooka kwa mtundu wa polyether ndi mtundu wa polyester ndi kotsika kuposa -62 ℃, pomwe kukana kutentha kochepa kwa mtundu wa ether wolimba ndikwabwino kuposa kwa mtundu wa polyester.

Makhalidwe abwino kwambiri a polyurethane thermoplastic elastomers ndi kukana kuvala bwino, kukana ozone bwino, kuuma kwambiri, mphamvu zambiri, kusinthasintha bwino, kukana kutentha kochepa, kukana mafuta bwino, kukana mankhwala, komanso kukana chilengedwe. M'malo ozizira, kukhazikika kwa hydrolysis kwa polyether esters kumaposa kwambiri kwa mitundu ya polyester.

Ma elastomer a polyurethane thermoplastic ndi opanda poizoni komanso opanda fungo, amasungunuka m'zinthu zosungunulira monga methyl ether, cyclohexanone, tetrahydrofuran, dioxane, ndi dimethylformamide, komanso m'zinthu zosakaniza zopangidwa ndi toluene, ethyl acetate, butanone, ndi acetone moyenerera. Amakhala opanda mtundu komanso owonekera bwino ndipo amakhala ndi kukhazikika bwino kosungira.