PU yog dab tsi

PU (Polyurethane) yog cov khoom siv hluavtaws uas tau siv dav hauv ntau yam lag luam, suav nrog kev tsim kho, tsheb, rooj tog zaum, thiab ntim khoom. Nws yog cov khoom siv ntau yam uas tuaj yeem tsim los muab ntau yam ntawm lub cev, nrog rau kev ua haujlwm ntev, yooj, thiab thermal kuj. PU feem ntau yog tsim los ntawm reacting polyol nrog ib qho isocyanate nyob rau hauv lub xub ntiag ntawm ib tug catalyst thiab lwm yam additives. Cov txiaj ntsig polymer muaj qhov sib txuas ntawm urethane hauv nws cov pob txha, uas muab nws cov yam ntxwv zoo. PU feem ntau categorized li thermosetting lossis thermoplastic, nyob ntawm nws lub xeev crosslinking. Thermosetting PU muaj peb-dimensional network qauv uas tsis tuaj yeem melted lossis remolded, thaum thermoplastic PU tuaj yeem yaj thiab rov ua dua. PU feem ntau xaiv rau nws cov kav ntev, elasticity, thiab ua haujlwm rau cov roj, cov kuab tshuaj, thiab puas. Nws tuaj yeem raug tsim los ua mos thiab rubbery lossis tawv thiab nruj, nyob ntawm daim ntawv thov.