Cov txheej txheem tsim khoom rau hnav-cov khoom tiv thaiv polyurethane pib nrog kev tswj hwm nruj ntawm cov khoom siv raw cov khoom sib piv-tshwj xeeb polyols, isocyanates, thiab cov khoom tsim nyog, cov tshuaj ntxiv, thiab cov khoom ntxiv. Cov khoom siv raw yuav tsum tau sib xyaw ua ke kom ntseeg tau tias cov khoom siv polyurethane ua tau raws li cov qauv tsim tshwj xeeb rau hardness, elasticity, thiab ntom. Thaum lub sij hawm molding theem -txawm yog siv casting, compression molding, los yog txhaj tshuaj molding cov txheej txheem- nws yog ib qho tseem ceeb kom paub meej tias cov pwm muaj qhov ntev thiab du nto los tiv thaiv kev tsim ntawm huab cua npuas, tawg, los yog hauv zos inconsistencies nyob rau hauv curing. Ua raws li cov txheej txheem molding, cov txheej txheem kho yuav tsum nruj tswj qhov kub thiab av noo kom ntseeg tau tias cov khoom ua tiav cov tshuaj tiv thaiv, yog li yielding hnav- cov khoom tiv thaiv uas tsis sib xws ntom ntom thiab elastic heev.
Tom qab ua tiav ntawm kev tsim khoom, hnav- cov khoom tiv thaiv polyurethane tau raug soj ntsuam nruj heev, suav nrog kev ntsuas qhov ntev, ntsuas qhov tawv, ntsuas lub zog tensile, thiab kev ntsuas kev hnav tsis kam, kom ntseeg tau tias txhua yam khoom ua tau raws li cov qauv tsim. Rau cov ntawv thov uas muaj kev ua haujlwm tshwj xeeb, kev kuaj xyuas ntxiv- xws li kev tiv thaiv corrosion, kub kub, thiab cuam tshuam- kuj tau ua. Lub hom phiaj tseem ceeb ntawm qhov kev tswj hwm kev tswj hwm zoo no yog los lav tias cov khoom siv tuaj yeem ua haujlwm ruaj khov nyob rau lub sijhawm ntev hauv kev xav tau ib puag ncig uas muaj kev puas tsuaj loj, kev cuam tshuam hnyav, lossis raug rau cov kua qaub thiab alkaline, thaum tib lub sijhawm tiv thaiv cov khoom puas lossis txo qis kev ua haujlwm los ntawm cov khoom siv tsis raug. Los ntawm kev ua raws li cov txheej txheem nruj me ntsis thiab cov qauv tshuaj ntsuam xyuas, tag nrho kev ntseeg siab thiab kev pab lub neej ntawm hnav- cov khoom siv polyurethane tiv taus tuaj yeem txhim kho tau zoo.
