Ama-polyurethane elastomers ayingxenye yama-polymer block, okungukuthi, ama-macromolecules e-polyurethane akhiwa "izingxenye ezithambile" kanye "nezingxenye eziqinile" futhi akha isakhiwo sokuhlukaniswa kwesigaba esincane, lapho izingxenye eziqinile (kusuka kuma-isocyanate namaketanga anwebekayo) zihlakazeka endaweni ethambile. isifunda sesigaba sesigaba (kusuka ku-oligomer polyols) ukuze sidlale indima yamaphoyinti okuxhumanisa angokwenyama.Ngakho-ke, uma kuqhathaniswa namanye amarabha okwenziwa (ama-elastomers), ama-polyurethane elastomers anamandla angcono nokumelana nokugqoka, Ukwelulwa okuphezulu kusengagcinwa lapho ubulukhuni buphezulu.
Izinto ze-elastic polyurethane, ezibizwa nge- “CASE” phesheya, ikakhulukazi zifaka imikhiqizo yendabuko ye-polyurethane elastomer, izinto zokugandaywa njengemigwaqo yepulasitiki ye-polyurethane, okokunamathela okungangeni manzi kwe-polyurethane, izinamathiselo, ama-sealant, izinto zokunamathisela ezimbizeni, njll., ezibalelwa ku-40% yenani eliphelele. imikhiqizo ye-polyurethane.Iningi lemikhiqizo eselashiwe yezinto ze-CASE (imikhiqizo esekwe emanzini kanye ne-solvent ngemva kokukhipha amanzi nezincibilikisi) izinto ezingezona igwebu ezinwebekayo ze-polyurethane.I-PU synthetic leather resin, ezinye izinto zokumboza nezinamatheliso ziyimikhiqizo esekwe ku-solvent noma esekwe emanzini, engabuye ibhekwe njengezisetshenziswa ze-polyurethane elastomer ngomqondo obanzi.Ngomqondo omncane, ama-polyurethane elastomers abhekisela kuma-polyurethane elastomers (CPU), ama-thermoplastic polyurethane elastomers (TPU) nama-polyurethane elastomers ahlanganisiwe (MPU), okubalelwa ku-10% noma ngaphansi kancane yenani eliphelele le-polyurethane.I-CPU ne-TPU ama-elastomer amakhulu e-polyurethane, futhi umehluko wabo usenqubweni yokukhiqiza kanye nezandiso zamaketango.Lolu hlobo lwe-polyurethane elastomer yendabuko, eyaziwa nangokuthi "irabha ye-polyurethane", iyingxenye yohlobo olukhethekile lwerabha yokwenziwa.I-polyurethane elastomer esebenza kahle kakhulu iyindlela engcono kakhulu yokungagugi phakathi kwazo zonke izinto zokwenziwa ze-polymer, ezaziwa ngokuthi "inkosi yokumelana nokugqoka", futhi isetshenziswa kabanzi emikhakheni eminingi, futhi izinhlelo zokusebenza ezintsha zisakhula.
I-polyurethane elastomer ingasetshenziswa esikhundleni sensimbi, ipulasitiki kanye nerabha evamile kwezinye izinkambu.
Uma kuqhathaniswa nezinto zensimbi, i-polyurethane elastomer inezinzuzo zesisindo esilula, umsindo ophansi, ukumelana nokugqoka, izindleko eziphansi zokucubungula kanye nokumelana nokubola kwe-asidi.Uma kuqhathaniswa namapulasitiki, inezinzuzo zokuqina okuphezulu nokumelana nokugqoka okuphezulu.Uma kuqhathaniswa nerabha evamile, i-polyurethane elastomer inezinzuzo zokumelana nokugqokwa, ukumelana nokusika, ukumelana nezinyembezi, umthamo omkhulu wokuthwala, ukumelana ne-ozone, njll., futhi kulula ukuyikhiqiza, ingafakwa ebhodweni, ithululwe, futhi inobunzima obuhlukahlukene.
Isikhathi sokuthumela: Feb-14-2023