Txau polyurea: ib qho khoom elastomeric ua los ntawm cov tshuaj tiv thaiv ntawm cov tshuaj hu ua isocyanate (raug xa mus rau A nrog) nrog ib qho compound compound (muab txo ua feem ntawm R). Cov isocyanate yuav yog cov ntxhuav los yog aliphatic. Lub Cheeb Tsam A ntawm yuav yog ib qho monomer, polymer, ib tug derivative ntawm isocyanate, prepolymer, thiab ib semi-prepolymer. Prepolymers thiab semi-prepolymers yog npaj los ntawm reacting lub davhlau ya nyob twg amino terminal los yog lub davhlau ya nyob twg hydroxyl compound nrog lub isocyanate. Cov khoom tivthaiv R yuav tsum yog tsim los ntawm lub tshuab dav hlau amino thiab lub tshuab dav hlau ruaj ruaj. Qhov kev sib tsoo pob zeb tsis haum yuav tsum tsis txhob muaj cov tshuaj tivthaiv hydroxyl thiab catalyst, tabsis yuav muaj ib tus neeg saib xyuas kev pabcuam rau kev pabcuam pigment dispersion.
Raws li cov khoom tshiab, polyurea tau hloov tag nrho cov neeg xaav kev xaav ntawm cov coatings yav dhau los. Vim tias tsis muaj lwm cov ntaub ntawv tuaj yeem tiv thaiv lub zog tag nrho thiab qhov hnyav hnyav tshaj plaws ntawm lub npog ntsej muag, thiab tib lub sij hawm tau txaus ua kom yooj yim, yog tias cov khoom siv polyurethane, qhwv pob zeb los yog steel qauv deformation tshwm sim thaum loj hlob thiab cog lus loj tshwm sim. Cov txheej txheem txheej txheem yuav tsis ua txhaum, txawm nyob hauv tej yam txawv txav xws li kev tawm dag zog thiab kev nyuaj siab, nws tuaj yeem npog tag nrho ntawm cov khoom ua haujlwm. Cov khoom zoo no tau lees tias qhov ntev thiab kev ntseeg ntawm polyurea hauv engineering applications, thiab nws lub neej ntev txog 30 mus rau 50 xyoo highlights cov nqi siab ntawm polyurea.
