Umehluko phakathiUhlobo lwe-TPU polyetherfuthiuhlobo lwe-polyester
I-TPU ingahlukaniswa ngezinhlobo ezimbili: uhlobo lwe-polyether kanye nohlobo lwe-polyester. Ngokwezidingo ezahlukene zokusetshenziswa komkhiqizo, izinhlobo ezahlukene ze-TPU zidinga ukukhethwa. Isibonelo, uma izidingo zokumelana ne-hydrolysis ziphakeme kakhulu, uhlobo lwe-polyether lwe-TPU lufaneleka kakhulu kune-polyester yohlobo lwe-TPU.
Ngakho-ke namuhla, ake sixoxe ngomehluko phakathiuhlobo lwe-polyether TPUfuthiuhlobo lwe-polyester TPU, nokuthi ungawahlukanisa kanjani? Okulandelayo kuzochaza ngezici ezine: umehluko ezintweni zokusetshenziswa, umehluko wesakhiwo, ukuqhathanisa ukusebenza, kanye nezindlela zokuhlonza.
1, Umehluko ezintweni zokusetshenziswa
Ngikholwa ukuthi abantu abaningi bayawazi umqondo wama-elastomer e-thermoplastic, anesici sokwakheka sokuqukatha izingxenye ezithambile neziqinile, ngokulandelana, ukuze kulethwe ukuguquguquka nokuqina kwezinto.
I-TPU futhi inezingxenye zeketanga elithambile neliqinile, futhi umehluko phakathi kwe-TPU yohlobo lwe-polyether kanye ne-TPU yohlobo lwe-polyester ulele emehlukoni wezingxenye zeketanga elithambile. Singabona umehluko ezintweni zokusetshenziswa.
Uhlobo lwe-Polyether TPU: 4-4 '- diphenylmethane diisocyanate (MDI), i-polytetrahydrofuran (PTMEG), i-1,4-butanediol (BDO), enomthamo ocishe ube ngu-40% we-MDI, u-40% we-PTMEG, kanye no-20% we-BDO.
Uhlobo lwe-polyester TPU: 4-4 '- diphenylmethane diisocyanate (MDI), 1,4-butanediol (BDO), i-adipic acid (AA), kanti i-MDI ilinganiselwa ku-40%, i-AA ilinganiselwa ku-35%, kanti i-BDO ilinganiselwa ku-25%.
Singabona ukuthi izinto zokusetshenziswa zesigaba se-TPU soft chain segment yohlobo lwe-polyether yi-polytetrahydrofuran (PTMEG); Izinto zokusetshenziswa zesigaba se-TPU soft chain segments yohlobo lwe-polyester yi-adipic acid (AA), lapho i-adipic acid isabela khona ne-butanediol ukuze yakhe i-polybutylene adipate ester njengesigaba se-soft chain.
2, umehluko wesakhiwo
Uchungechunge lwama-molecule lwe-TPU lunesakhiwo esiqondile se-(AB) n-type block, lapho i-A iyi-polyester noma i-polyester enesisindo esiphezulu sama-molecule (1000-6000), i-B ngokuvamile iyi-butanediol, kanti isakhiwo samakhemikhali esiphakathi kwezingxenye zochungechunge lwe-AB siyi-diisocyanate.
Ngokwezakhiwo ezahlukene ze-A, i-TPU ingahlukaniswa ngohlobo lwe-polyester, uhlobo lwe-polyether, uhlobo lwe-polycaprolactone, uhlobo lwe-polycarbonate, njll. Izinhlobo ezivame kakhulu uhlobo lwe-polyether TPU kanye nohlobo lwe-polyester TPU.
Kusukela esithombeni esingenhla, singabona ukuthi amaketanga aphelele ama-molecule ohlobo lwe-polyether TPU kanye nohlobo lwe-polyester TPU womabili ayizakhiwo eziqondile, kanti umehluko omkhulu ukuthi ingxenye yeketanga elithambile iyi-polyol ye-polyester noma i-polyol ye-polyester.
3, Ukuqhathanisa Ukusebenza
Ama-polyol e-polyether angama-polymer noma ama-oligomer anezibopho ze-ether namaqembu e-hydroxyl emaqenjini okugcina esakhiweni se-molecule main chain. Ngenxa yamandla ayo aphansi okuhlangana kwezibopho ze-ether esakhiweni sayo kanye nokulula kokujikeleza.
Ngakho-ke, i-polyether TPU inokuguquguquka okuhle kakhulu kwezinga lokushisa eliphansi, ukumelana ne-hydrolysis, ukumelana nesikhunta, ukumelana ne-UV, njll. Umkhiqizo unomuzwa omuhle wesandla, kodwa amandla okuqhekeka kanye namandla okuqhekeka aphansi kakhulu.
Amaqembu e-ester anamandla okubopha aqinile e-covalent kuma-polyol e-polyester angakha izibopho ze-hydrogen ngezingxenye ze-hard chain, esebenza njengezindawo zokuxhumanisa ezinwebekayo. Kodwa-ke, i-polyester ithambekele ekuqhekekeni ngenxa yokuhlasela kwama-molecule amanzi, futhi i-asidi ekhiqizwa yi-hydrolysis ingathuthukisa i-hydrolysis ye-polyester.
Ngakho-ke, i-polyester TPU inezakhiwo ezinhle kakhulu zemishini, ukumelana nokuguguleka, ukumelana nokudabuka, ukumelana nokugqwala kwamakhemikhali, ukumelana nokushisa okuphezulu, kanye nokucutshungulwa okulula, kodwa ukumelana ne-hydrolysis embi.
4, Indlela yokuhlonza
Ngokuqondene nokuthi iyiphi i-TPU engcono ukuyisebenzisa, kungashiwo kuphela ukuthi ukukhetha kufanele kusekelwe ezidingweni zomzimba zomkhiqizo. Ukuze ufeze izakhiwo ezinhle zemishini, sebenzisa i-polyester TPU; Uma ucabangela izindleko, ubuningi, kanye nendawo yokusetshenziswa komkhiqizo, njengokwenza imikhiqizo yokuzijabulisa emanzini, i-polyether TPU ifaneleka kakhulu.
Kodwa-ke, lapho ukhetha, noma uxuba ngephutha izinhlobo ezimbili zama-TPU, azinawo umehluko omkhulu ngokubukeka. Ngakho-ke kufanele sizihlukanise kanjani?
Empeleni kunezindlela eziningi, njenge-chemical colorimetry, i-gas chromatography-mass spectrometry (GCMS), i-mid infrared spectroscopy, njll. Kodwa-ke, lezi zindlela zidinga izidingo zobuchwepheshe eziphezulu futhi zithatha isikhathi eside.
Ingabe ikhona indlela yokuhlonza elula nesheshayo? Impendulo inguyebo, isibonelo, indlela yokuqhathanisa ubuningi.
Le ndlela idinga umhloli wobuningi oyedwa kuphela. Uma sithatha imitha yobuningi yerabha enembayo ephezulu njengesibonelo, izinyathelo zokulinganisa yilezi:
Beka umkhiqizo etafuleni lokulinganisa, bonisa isisindo somkhiqizo, bese ucindezela inkinobho ethi Enter ukuze ukhumbule.
Beka umkhiqizo emanzini ukuze ubonise inani lobuningi.
Yonke inqubo yokulinganisa ithatha cishe imizuzwana emi-5, bese ingahlukaniswa ngokusekelwe esimisweni sokuthi ubuningi bohlobo lwe-polyester TPU buphakeme kunobohlobo lwe-polyether TPU. Ububanzi bobuningi obuthile yilobu: uhlobo lwe-polyether TPU -1.13-1.18 g/cm3; i-Polyester TPU -1.18-1.22 g/cm3. Le ndlela ingahlukanisa ngokushesha phakathi kohlobo lwe-TPU polyester nohlobo lwe-polyether.
Isikhathi sokuthunyelwe: Juni-03-2024