Umehluko omkhulu phakathi kwesikhumba se-PU esekwe emanzini kanye nesikhumba esijwayelekile se-PU ukuvikelwa kwemvelo, izakhiwo ezibonakalayo, inqubo yokukhiqiza kanye nobubanzi bokusetshenziswa.
Ukuvikelwa kwemvelo: Isikhumba se-PU esisekelwe emanzini sisebenzisa amanzi njengendlela yokuhlakazeka enqubweni yokukhiqiza, ngakho-ke ayinabo ubuthi, ayishisi, futhi ayingcolisi imvelo. Inezici zokonga amandla, ukuphepha kanye nokuvikelwa kwemvelo. Ngokuphambene, isikhumba esivamile se-PU singase sikhiqize igesi engcolile neyingozi kanye namanzi angcolile ngesikhathi sokukhiqiza nokusetshenziswa, okunomthelela othile emvelweni nempilo yomuntu.
Izinto ezibonakalayo: Isikhumba se-PU esisekelwe emanzini sinezici ezibonakalayo ezinhle kakhulu, okuhlanganisa amandla acwebile aphezulu, ukumelana nokugoqa okuphezulu, ukumelana nokugqoka okuphezulu, njll. Lezi zakhiwo zenza isikhumba se-PU esisekelwe emanzini sibe esingcono kunesikhumba sangempela kanye nesikhumba sokwenziwa esisekelwe ku-solvent. Yize isikhumba esijwayelekile se-PU sibuye sibe nezinto ezithile ezibonakalayo, singase singabi yinhle njengesikhumba se-PU esekwe emanzini ngokuya ngokuvikelwa kwemvelo nokuqina.
Inqubo yokukhiqiza: Isikhumba se-PU esekwe emanzini senziwe ngefomula yenqubo ekhethekile esekwe emanzini kanye nemishini evumelana nemvelo, futhi inezinzuzo zokungagugi kahle nokumelana nokuklwebheka, kanye nokumelana ne-ultra-long hydrolysis. Lezi zinzuzo zitholakala kungqimba lwamanzi olusekelwe emanzini kanye nama-agent ayisizayo, aphindwe kabili ukumelana nokugqoka kwawo kanye nokumelana nokuklwebheka, okuphindwe izikhathi ezingaphezu kwezingu-10 kunemikhiqizo yesikhumba evamile emanzi yokwenziwa. Inqubo yokukhiqiza yesikhumba se-PU evamile ingase ingabandakanyi lobu buchwepheshe bokuvikela imvelo kanye nokuthuthukiswa kokusebenza.
Ububanzi bokusebenza: Isikhumba se-PU esisekelwe emanzini sisetshenziswa kakhulu emikhakheni eminingi efana nezicathulo, izingubo zokugqoka, osofa, nezimpahla zezemidlalo ngenxa yokuvikelwa kwemvelo kanye nezakhiwo ezinhle kakhulu zomzimba, futhi sihlangabezana nezidingo ezihlukahlukene zokwenziwa kokuvikelwa kwemvelo kwesikhumba ekhaya nakwamanye amazwe. Nakuba isikhumba esivamile se-PU sisetshenziswa kabanzi ekuhlobiseni izikhwama, izingubo zokugqoka, izicathulo, izimoto kanye nefenisha, ububanzi baso bokusetshenziswa bungase buncike emikhawulweni ethile kumongo wezidingo eziqinile zokuvikelwa kwemvelo.
Kafushane, isikhumba se-PU esisekelwe emanzini sinezinzuzo ezisobala kunesikhumba esivamile se-PU mayelana nokuvikelwa kwemvelo, izakhiwo ezibonakalayo, inqubo yokukhiqiza kanye nobubanzi bokufaka isicelo, futhi siyinto ehlangabezana kangcono nezidingo zesimanje zokuvikelwa kwemvelo kanye nezidingo zokusebenza okuphezulu.