Desiccants yog cov khoom siv uas tshem tawm cov dej noo los ntawm cov ntaub ntawv ntub dej thiab tau siv dav rau kev tiv thaiv ya raws hauv ntau yam khoom xws li zaub mov, tshuaj, khoom siv hluav taws xob, thiab khaub ncaws. Lawv lub luag haujlwm tseem ceeb yog txo cov av noo ib puag ncig, tiv thaiv cov khoom los ntawm kev ntub dej, pwm, xeb, lossis ua haujlwm tsis zoo.
Cov yam ntxwv yooj yim
Strong Hygroscopicity: Desiccants yuav tsum muaj peev xwm nqus dej kom muaj txiaj ntsig zoo, sai sai nqus dej vapor los ntawm huab cua nyob rau hauv ib puag ncig kaw kom muaj cov av noo tsawg.
Kev nyab xeeb siab: Cov khoom siv desiccants siv, tshwj xeeb tshaj yog nyob rau hauv cov khoom noj thiab cov khoom siv niaj hnub ntim, yuav tsum tsis muaj - tshuaj lom, tsis muaj ntxhiab, tsis yog - corrosive, thiab ib puag ncig tus phooj ywg, tsis muaj kev puas tsuaj rau tib neeg lossis cov khoom. Piv txwv li, silica gel thiab montmorillonite desiccants yog dav suav hais tias muaj kev nyab xeeb thiab ib puag ncig tus phooj ywg.
Chemical Stability: Feem ntau lub cev desiccants (xws li silica gel) muaj tshuaj ruaj khov, tsis hnov mob nrog cov khoom tiv thaiv, thiab tiv taus cov kua qaub thiab alkalis (tshwj tsis yog muaj zog alkalis thiab hydrofluoric acid), ua rau lawv tsim nyog siv rau ntau qhov chaw.