Umahluko ophambili phakathi kwesikhumba sePU esekwe emanzini kunye nesikhumba esiqhelekileyo sePU kukhuseleko lokusingqongileyo, iipropathi ezibonakalayo, inkqubo yokuvelisa kunye nobubanzi bokusetyenziswa.
Ukukhuselwa kwendalo: Isikhumba se-PU samanzi sisebenzisa amanzi njengendlela yokusabalalisa kwinkqubo yokuvelisa, ngoko ke ayinayo ityhefu, ayinakutsha, kwaye ayingcolisi indalo. Ineempawu zokonga amandla, ukhuseleko kunye nokukhuselwa kwendalo. Ngokwahlukileyo, i-PU yesikhumba eqhelekileyo inokuvelisa igesi eyityhefu kunye neyingozi kunye namanzi amdaka ngexesha lemveliso kunye nokusetyenziswa, enempembelelo ethile kwindalo kunye nempilo yabantu.
Iimpawu ezibonakalayo: Isikhumba se-PU samanzi sineempawu ezibalaseleyo zomzimba, kubandakanywa amandla aphezulu e-peel, ukuxhathisa ukugoqa okuphezulu, ukuxhathisa ukunxiba, njl. Ezi zakhiwo zenza i-PU yesikhumba samanzi ibe yinto engcono kunesikhumba sokwenyani kunye ne-solvent-based synthetic yesikhumba. Nangona ufele oluqhelekileyo lwe-PU lukwanazo iimpawu ezithile zomzimba, lusenokungabi luhle njengesikhumba sePU esekwe emanzini ngokokhuseleko lokusingqongileyo kunye nokuqina.
Inkqubo yokuvelisa: Isikhumba se-PU esekwe emanzini senziwe ngefomula ekhethekileyo yenkqubo esekwe emanzini kunye nezixhobo ezihambelana nokusingqongileyo, kwaye ineengenelo zokumelana nokunxiba okuhle kunye nokumelana nokuqala, kunye nokumelana ne-ultra-long hydrolysis. Ezi zibonelelo ziphuma kumanzi asekelwe emanzini kunye nee-agent ezincedisayo, eziphinda kabini ukuxhathisa ukunxiba kunye nokuxhathisa ukukrazula, okungaphezulu kwamaxesha angama-10 aphezulu kuneemveliso zesikhumba ezimanzi eziqhelekileyo zokwenziwa. Inkqubo yemveliso yesikhumba ye-PU eqhelekileyo isenokungabandakanyi obu buchwephesha bokukhuselwa kwendalo kunye nokuphucula ukusebenza.
Ububanzi besicelo: Isikhumba sePU esekwe emanzini sisetyenziswa kakhulu kwiindawo ezininzi ezinjengezihlangu, iimpahla, iisofa, iimpahla zemidlalo, njl.njl. ngenxa yokhuseleko lokusingqongileyo kunye neempawu ezibalaseleyo zomzimba, kwaye zihlangabezana neemfuno ezahlukeneyo zokukhuselwa kwesikhumba sokwenziwa ekhaya kwaye phesheya. Nangona ufele oluqhelekileyo lwe-PU lukwasetyenziswa ngokubanzi ekuhombiseni iibhegi, iimpahla, izihlangu, izithuthi kunye nefanitshala, umda wokusetyenziswa kwawo unokuxhomekeke kwizithintelo ezithile kumxholo weemfuno ezingqongqo zokhuseleko lokusingqongileyo.
Isishwankathelo, i-PU yesikhumba esekelwe emanzini ineenzuzo ezicacileyo ngaphezu kwesikhumba se-PU esiqhelekileyo ngokubhekiselele kukhuseleko lokusingqongileyo, iimpawu ezibonakalayo, inkqubo yokuvelisa kunye nobubanzi besicelo, kwaye zizinto eziphathekayo ezihlangabezana kangcono neemfuno zanamhlanje zokusingqongileyo kunye neemfuno eziphezulu zokusebenza.