Umehluko phakathiUhlobo lwe-TPU polyetherfuthiuhlobo lwe-polyester
I-TPU ingahlukaniswa ngezinhlobo ezimbili: uhlobo lwe-polyether nohlobo lwe-polyester. Ngokwezidingo ezihlukene zezicelo zomkhiqizo, izinhlobo ezahlukene zama-TPU zidinga ukukhethwa. Isibonelo, uma izidingo zokumelana ne-hydrolysis ziphakeme, uhlobo lwe-polyether TPU lufaneleka kakhulu kunohlobo lwe-polyester TPU.
Ngakho namuhla, ake sikhulume ngomehluko phakathii-polyether uhlobo lwe-TPUfuthii-polyester uhlobo lwe-TPU, kanye nendlela yokuwahlukanisa? Okulandelayo kuzochaza kabanzi ngezici ezine: umehluko wezinto ezingavuthiwe, umehluko wesakhiwo, ukuqhathanisa ukusebenza, nezindlela zokuhlonza.
1. Umehluko ezintweni zokusetshenziswa
Ngikholwa ukuthi abantu abaningi bayawazi umqondo wama-thermoplastic elastomers, anesici sesakhiwo sokuqukatha amasegimenti athambile naqinile, ngokulandelana, ukuletha ukuguquguquka nokuqina kokubalulekile.
I-TPU futhi inazo zombili izingxenye zamaketango athambile futhi aqinile, futhi umehluko phakathi kohlobo lwe-polyether TPU nohlobo lwe-polyester lwe-TPU usemehlukweni wezingxenye zamaketango athambile. Siyawubona umehluko ezintweni ezisetshenziswayo.
I-polyether yohlobo lwe-TPU: 4-4 '- diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), 1,4-butanediol (BDO), enomthamo ocishe ube ngu-40% we-MDI, u-40% we-PTMEG, no-20% we-BDO.
I-polyester yohlobo lwe-TPU: 4-4 '- i-diphenylmethane diisocyanate (MDI), 1,4-butanediol (BDO), i-adipic acid (AA), ene-MDI ebalwa cishe ngama-40%, i-AA ibalwa cishe ngama-35%, futhi i-BDO ibalwa cishe 25%.
Siyabona ukuthi impahla eluhlaza yohlobo lwe-polyether yengxenye yeketango elithambile i-polytetrahydrofuran (PTMEG); Impahla yokusetshenziswa yezingxenye zeketango elithambile le-polyester ye-TPU yi-adipic acid (AA), lapho i-adipic acid ihlangana ne-butanediol yakhe i-polybutylene adipate ester njengengxenye yeketango elithambile.
2. Umehluko wesakhiwo
Iketango lamangqamuzana e-TPU linomugqa we-(AB) n-uhlobo lwebhulokhi, lapho u-A eyisisindo semolekyuli ephezulu (1000-6000) i-polyester noma i-polyether, B ngokuvamile iyi-butanediol, futhi ukwakheka kwamakhemikhali phakathi kwamasegimenti ochungechunge lwe-AB kuyi-disocyanate.
Ngokwezakhiwo ezihlukene ze-A, i-TPU ingahlukaniswa ngohlobo lwe-polyester, uhlobo lwe-polyether, uhlobo lwe-polycaprolactone, uhlobo lwe-polycarbonate, njll. Izinhlobo ezivame kakhulu uhlobo lwe-polyether ye-TPU kanye nohlobo lwe-polyester ye-TPU.
Kusukela kulesi sibalo esingenhla, singabona ukuthi amaketanga amamolekyuli ewonke ohlobo lwe-polyether ye-TPU nohlobo lwe-polyester ye-TPU yizo zombili izakhiwo eziqondile, umehluko omkhulu ukuthi ingabe ingxenye yeketango elithambile iyi-polyether polyol noma i-polyester polyol.
3, Ukuqhathanisa ukusebenza
Ama-polyether polyols ama-polymers wotshwala noma ama-oligomer anamabhondi e-ether namaqembu e-hydroxyl emaqenjini okugcina esakhiweni seketango eliyinhloko lamangqamuzana. Ngenxa yamandla ayo aphansi ahlangene amabhondi e-ether esakhiweni sawo kanye nokulula kokujikeleza.
Ngakho-ke, i-polyether TPU inokuguquguquka okuhle kakhulu kwezinga lokushisa eliphansi, ukumelana ne-hydrolysis, ukumelana nesikhunta, ukumelana ne-UV, njll. Umkhiqizo unokuzwakala kahle kwesandla, kodwa amandla e-peel namandla okuphuka ampofu uma kuqhathaniswa.
Amaqembu e-ester anamandla aqinile okuhlanganiswa kwe-covalent kuma-polyester polyols angakha amabhondi e-hydrogen ngamasegimenti amaketango aqinile, asebenza njengamaphoyinti okuxhumanisa okunwebekayo. Kodwa-ke, i-polyester ijwayele ukuphuka ngenxa yokuhlasela kwama-molecule amanzi, futhi i-asidi ekhiqizwa i-hydrolysis ingathuthukisa i-hydrolysis ye-polyester.
Ngakho-ke, i-polyester TPU inezici ezinhle kakhulu zemishini, ukumelana nokugqokwa, ukumelana nezinyembezi, ukumelana nokugqwala kwamakhemikhali, ukumelana nokushisa okuphezulu, nokucubungula kalula, kodwa ukumelana ne-hydrolysis okungekuhle.
4. Indlela yokuhlonza
Ngokuqondene nokuthi iyiphi i-TPU engcono ukuyisebenzisa, kungashiwo ukuthi ukukhetha kufanele kusekelwe ezidingweni zomzimba zomkhiqizo. Ukufeza izakhiwo ezinhle zemishini, sebenzisa i-polyester TPU; Uma ucabangela izindleko, ukuminyana, kanye nemvelo yokusetshenziswa komkhiqizo, njengokwenza imikhiqizo yokuzijabulisa yamanzi, i-polyether TPU ifaneleka kakhulu.
Nokho, lapho ukhetha, noma uhlanganisa ngephutha izinhlobo ezimbili zama-TPU, azinawo umehluko omkhulu ekubukekeni. Ngakho kufanele sizihlukanise kanjani?
Empeleni ziningi izindlela, ezifana ne-colorimetry yamakhemikhali, i-gas chromatography-mass spectrometry (GCMS), i-middle infrared spectroscopy, njll. Nokho, lezi zindlela zidinga izidingo eziphezulu zobuchwepheshe futhi zithatha isikhathi eside.
Ingabe ikhona indlela elula futhi esheshayo yokuhlonza? Impendulo inguyebo, isibonelo, indlela yokuqhathanisa ukuminyana.
Le ndlela idinga kuphela umhloli wokuminyana oyedwa. Ukuthatha imitha yerabha enembayo ephezulu njengesibonelo, izinyathelo zokulinganisa yilezi:
Beka umkhiqizo etafuleni lokukala, ubonise isisindo somkhiqizo, bese ucindezela inkinobho ethi Enter ukuze ukhumbule.
Beka umkhiqizo emanzini ukuze ubonise inani lokuminyana.
Yonke inqubo yokulinganisa ithatha cishe imizuzwana emi-5, bese ingahlukaniswa ngokusekelwe esimisweni sokuthi ukuminyana kohlobo lwe-polyester TPU kuphezulu kunohlobo lwe-polyether TPU. Ibanga elithile lokuminyana yilaba: uhlobo lwe-polyether TPU -1.13-1.18 g/cm3; I-Polyester TPU -1.18-1.22 g/cm3. Le ndlela ingakwazi ukuhlukanisa ngokushesha phakathi kohlobo lwe-polyester ye-TPU kanye nohlobo lwe-polyether.
Isikhathi sokuthumela: Jun-03-2024