Feem ntau hais lus, thaum ob-xyaw hnyav-ua rau polyurethane nplaum tsim, qhov sib faib ntawm ob pawg yog qhov loj dua li ntawm hom tsis-hnyav. Txawm li cas los xij, yog tias muaj ntau NCO pawg hauv cov lus sib txuas, qhov kev kho kom zoo yuav tsis ua tiav, thiab cov kua nplaum uas kho tau Cov nplaum nplaum yog qhov nyuaj thiab txawm tias nkim; yog tias muaj cov khoom siv hydroxyl ntau dhau, txheej nplaum yuav ua mos thiab nplaum, nrog tsawg cohesion thiab tsis ua haujlwm lub zog tsis zoo. Lub latitude ntawm hnyav-dawb ob-tivthaiv nplaum piv yog me dua li ntawm cov kuab-based ib. Qhov no yog vim tias qhov pib qog ntawm qhov hnyav ntawm txhua feem yuav me me. Yog tias ib qho ntawm cov khoom siv ntau dhau mus, lub curing yuav qeeb thiab tsis yooj yim ua kom tiav, thiab saum npoo ntawm cov nplaum txheej yuav tsum nplaum. Tsawg siv ua.
Daim iav kua nplaum uas tsim nyog yuav tsum tau siv nyob rau txhua txhua hnub, vim tias cov kua nplaum uas muaj daim duab ua ke muaj lub neej nyob rau hauv lub lauj kaub. Lub lauj kaub lub neej yog lub sijhawm thaum lub sijhawm cov nplaum tsim hluav taws xob tuaj yeem tuav nws txoj kev tsim kho. Lub viscosity nce nrog lub sijhawm khaws cia, yog li lub sijhawm ua haujlwm yog qhov nyuaj, kom txog thaum lub kua nplaum poob nws cov fluidity thiab gels thiab tsis dhau. Txawv ntau hom thiab qib ntawm polyurethane nplaum muaj qhov sib txawv ntawm lub lauj kaub lub neej, txij li ob peb feeb mus rau ob peb hnub. Thaum siv nyob rau hauv loj qhov ntau nyob rau hauv kev lag luam ntau lawm, lub lauj kaub lub neej sim yuav tsum tau ua ua ntej.
Yog tias muaj cov catalyst hauv cov nplaum tivthaiv, lossis cov khoom siv ntxiv thaum lub sijhawm cov kua nplaum xa mus rau qhov ua kom zoo sai, lub lauj kaub lub neej yuav luv dua. Tsis tas li ntawd, qhov kub thiab txias tau cuam tshuam ntau dua rau cov lauj kaub lub neej, uas luv nyob rau lub caij ntuj sov thiab ntev ntev hauv lub caij ntuj no. Qhov ob-tivthaiv polyurethane kua nplaum diluted nrog urethane-qib organic solvent muaj lub lauj kaub ntev dua. Kev kho cov tshuaj tiv thaiv kev ua kom zoo-raws li ob-tivthaiv cov tshuaj tiv thaiv, xws li ob-tivthaiv polyurethane nplaum rau cov yas hloov tau yooj yim, muaj lub lauj kaub lub neej ntawm ntau dua 8 teev (uas yog, ib hnub ua haujlwm).
Yog tias cov kua nplaum uas tau npaj siv tsis tuaj yeem siv nyob rau tib hnub, nws tuaj yeem kho tau kom zoo, thiab cov npog sab saud tau kaw, thiab khaws cia rau qhov chaw txias. Txheeb rau cov cua ntsawj lossis cov gel tshwm sim thaum koj mus ua haujlwm hnub tom ntej. Yog tias tsis muaj qhov pom tseeb ntawm qhov pom ntawm cov kua nplaum thiab cov npliag ntawm qhov ua tau zoo, Nws tseem siv tau. Feem ntau, ib qho nyiaj me me tuaj yeem ntxiv rau qhov tau npaj ua kua nplaum tshiab hauv cov nqaj hlau. Yog tias nws tau ua kom phem, nws yuav tsum tau muab pov tseg.
