Cov tshuaj polyurethane tau ntxig li 30% phosphoric acid, 30% nitric acid, 30% sulfuric acid, 10% sulfuric acid, thiab 10% sodium hydroxide kua, thiab lub zog tensile thiab rhuav lub zog ntawm kev kuaj tau periodically kuaj.
Polyurea txheej acid thiab alkali tiv thaiv yuav to taub raws li stability ntawm polyurea khoom rau dej thiab kua qaub-luj kua. Nws muaj cov txheej txheem nthuav dav ntawm cov khoom siv ntawm polyurea thiab nws cov tshuaj tiv thaiv nrog kua qaub-tov kua, ua rau laus ntawm txheej. txheej txheem ntawm.
Nws tuaj yeem pom los ntawm cov kev ntsuam xyuas pom tias cov khoom siv dag zog ntawm cov coatings poob tom qab polyurea txheej twb soaked nyob rau hauv ntau cov kua qaub thiab alkali kua, thiab lub zog tensile ntawm tus txheej twb ho siab tshaj dua tus tsim kua muag. Cov qaug zog acid thiab qis qis tsis tshua muaj zog ntawm kev ua haujlwm ntawm polyurea txheej, thiab lub tawm lub dag lub zog tsis txo tau. Lub txheej txheem polyurea muaj peev xwm tswj tau cov cuab yeej zoo nyob hauv cov kua qaub thiab qaug zog alkali.
Cov khoom siv sib xyaw ntawm cov khoom siv polyurea immersed nyob rau 10% NaOH kua ntau dua li cov khoom siv ntawm cov txheej tom qab immersion hauv 10% H2SO4 kua. Nws yuav tsum tau pov thawj tias polyurea cov ntaub ntawv muaj zoo alkali tsis kam tshaj txoj hauv kev acid. 30% nitric acid nrog oxidizing cuab yeej muaj cuab kev ntau dua rau cov txheej. Tom qab 20 hnub ntawm immersion, cov khoom siv cuab yeej ntawm cov txheej yog obviously txo.
