Ama-elastomer e-polyurethane ayingxenye yama-polymer block, okungukuthi, ama-macromolecules e-polyurethane akhiwa "izingxenye ezithambile" kanye "nezingxenye ezinzima" futhi akha isakhiwo sokuhlukanisa isigaba esincane.Amasegimenti aqinile (atholakala kuma-isocyanate kanye nama-chain extender) ahlakazekile esifundeni sesigaba sesigaba esithambile (etholakala kuma-oligomer polyols) futhi adlala indima yamaphuzu okuphambana ngokomzimba.Ngakho-ke, uma kuqhathaniswa nezinye irabha yokwenziwa (ama-elastomers), ama-polyurethane elastomers anamandla angcono nokumelana nokugqoka, Ukwelulwa okuphezulu kusengagcinwa lapho ubulukhuni buphezulu.
Izinto ze-elastic polyurethane, ezibizwa ngokuthi "icala" emazweni angaphandle, ikakhulukazi zihlanganisa imikhiqizo yendabuko ye-polyurethane elastomer, umzila wepulasitiki we-polyurethane nezinye izinto zokugandaywa kwezinyawo, okokunamathela okungangeni manzi kwe-polyurethane, izinto zokunamathisela, ama-sealant, izinto zokunamathisela ezimbizeni, njll., ezibalelwa ku-40% inani eliphelele lemikhiqizo ye-polyurethane.Iningi lemikhiqizo eselashiwe ye-case materials (imikhiqizo esekwe emanzini kanye ne-solvent isusa amanzi nezincibilikizi) izinto ezingezona igwebu ezinwebekayo ze-polyurethane.I-PU synthetic leather resin, ezinye izinto zokunamathela nezinamatheliso ziyimikhiqizo esekwe ku-solvent noma enamanzi, engabuye ibhekwe njengezisetshenziswa ze-polyurethane elastomer ngomqondo obanzi.Ngomqondo omncane, i-polyurethane elastomer ibhekisela ku-cast polyurethane elastomer (CPU), i-thermoplastic polyurethane elastomer (TPU) kanye ne-polyurethane elastomer ehlanganisiwe (MPU), ebalwa ngo-10% noma ngaphansi kancane kwengqikithi ye-polyurethane.I-CPU ne-TPU ama-elastomers e-polyurethane ayinhloko, futhi umehluko wabo usezicini ezifana nenqubo yokukhiqiza kanye ne-chain extender.Lolu hlobo lwe-polyurethane elastomer yendabuko, eyaziwa nangokuthi "irabha ye-polyurethane", iyingxenye yerabha yokwenziwa ekhethekile.Ukusebenza okuphezulu kwe-polyurethane elastomer kuyimpahla enokumelana okuhle kakhulu kokugqokwa phakathi kwazo zonke izinto zokwenziwa ze-polymer.Kuyaziwa ngokuthi "inkosi yokumelana nokugqoka".Isetshenziswa kabanzi emikhakheni eminingi, futhi izinhlelo ezintsha zisakhula.
Ama-elastomer e-polyurethane angasetshenziswa esikhundleni sensimbi, amapulasitiki kanye nenjoloba evamile kwezinye izinkambu.
Uma kuqhathaniswa nezinto zensimbi, i-polyurethane elastomer inezinzuzo zesisindo esincane, umsindo ophansi, ukumelana nokulahlekelwa, izindleko eziphansi zokucubungula kanye nokumelana nokugqwala 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, ukwakhiwa okulula, ukubumba nokuthela, kanye nobubanzi obuqinile bobubanzi.
I-polyurethane elastomer iyinhlobonhlobo ebalulekile ye-polyurethane.Njengamanje, ukusetshenziswa kwayo kubalelwa cishe ku-10% wengqikithi yokusetshenziswa kwe-polyurethane.I-polyurethane elastomer isetshenziselwa ukukhiqiza zonke izinhlobo zamasondo enjoloba, amabhande okuthutha, amapayipi erabha angavimbeli amanzi futhi amelana nokucindezela, imicu yokuvala namasongo, imigodla yezintambo namafilimu ahlukahlukene.Imikhiqizo isetshenziswa kabanzi kwensimbi nensimbi, papermaking, izimayini, imishini, ukunyathelisa kanye nezinye izimboni.I-polyurethane elastomer ingashintshwa ngamanye ama-polymer, imicu, izigcwalisi zempushana, njll. ukuze kuncishiswe izindleko futhi kuthuthukiswe ukusebenza.
Isikhathi sokuthumela: May-05-2022