HPMC, tseem hu ua hydroxypropyl methylcellulose, yog ib qho tshuaj ntxiv zoo heev uas siv dav hauv kev lag luam kev tsim kho, tshwj xeeb tshaj yog hauv kev tsim cov putty phab ntsa. Wall putty yog siv los npaj thiab theem phab ntsa ua ntej pleev xim, yog li muab qhov tiav zoo meej.
Ntau tus neeg ua vaj tse tau muaj teeb meem nrog kev sagging yav dhau los. Sag tshwm sim thaum putty pib swb tawm ntawm phab ntsa vim nws qhov hnyav. Qhov no ua rau muaj qhov tiav tsis sib xws thiab tsis zoo uas siv sijhawm thiab kev siv zog ntau los kho. Txawm li cas los xij, cov neeg ua vaj tse tau pom ib qho kev daws teeb meem los ntawm kev ntxiv HPMC rau ntawm phab ntsa putty, uas pab txhim kho qhov kev tiv thaiv sag thiab qhov zoo ntawm cov khoom kawg.
Muaj ntau yam laj thawj vim li cas HPMC thiaj li yog ib qho khoom siv zoo heev. Ua ntej, nws ua haujlwm ua ib qho thickener, uas txhais tau tias nws pab ua kom cov khoom siv putty viscosity ntau dua. Qhov viscosity nce ntxiv no ua rau nws nyuaj rau cov khoom siv kom swb tawm ntawm phab ntsa thiab ua kom yooj yim rau kev lo rau ntawm qhov chaw. Qhov viscosity nce ntxiv ntawm putty kuj ua rau nws sau cov kab nrib pleb me me thiab cov qhov me me hauv phab ntsa, muab qhov chaw du thiab sib npaug dua. Qhov feature no kuj pab txo qhov ntau ntawm putty uas xav tau los npog ib qho chaw, ua rau muaj kev daws teeb meem pheej yig dua.
Qhov thib ob, HPMC ua lub luag haujlwm tseem ceeb hauv kev tswj qhov ceev ntawm cov phab ntsa putty. Qhov ceev ntawm kev ziab ncaj qha cuam tshuam rau qhov kev tiv thaiv sag ntawm cov putty, thiab cov putty qeeb-qhuav feem ntau ruaj khov dua thiab tsis yooj yim rau sag. HPMC pab tswj qhov nrawm ntawm kev evaporation ntawm cov dej hauv cov khoom putty, uas ua rau nws cuam tshuam rau nws lub sijhawm ziab. Qhov kev muab no ua rau cov putty ruaj khov dua thiab sib xws uas qhuav sib npaug, txo qhov muaj feem ntawm sag.
HPMC kuj tseem siv tau los txhim kho qhov kev sib txuas ntawm phab ntsa putty thiab substrate. Kev sib txuas yog hais txog qib uas cov khoom siv putty lo rau ntawm qhov chaw uas nws siv rau. HPMC tuaj yeem txhim kho qhov kev sib txuas vim nws muab cov zaj duab xis tiv thaiv rau ntawm qhov chaw, uas txhim kho qhov kev sib txuas ntawm putty rau lub substrate.
Ntxiv rau, HPMC kuj tseem tuaj yeem pab khaws cov dej noo hauv cov ntaub ntawv phab ntsa putty. Txawm hais tias dej yog qhov tseem ceeb rau kev ua putty thiab khov, nws tseem yog qhov ua rau tawg thiab sagging ntawm cov khoom thaum cov dej evaporate sai dhau. HPMC pab khaws cov dej noo hauv cov ntaub ntawv putty ntev, cia cov putty kom sib npaug thiab qhuav yam tsis sagging.
Hauv kev xaus lus, HPMC yog ib qho tseem ceeb thiab muaj txiaj ntsig zoo rau cov khoom siv hauv phab ntsa putty, uas ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov khoom tiv thaiv kev sagging ntawm phab ntsa putty. Nrog nws cov tuab, kev tswj tus nqi ziab, kev txhim kho kev nplaum thiab cov khoom khaws cia dej, HPMC muab cov neeg tsim khoom ib qho kev daws teeb meem zoo rau cov teeb meem sagging thiab txhim kho qhov zoo ntawm cov khoom kawg. Qhov zoo tsis yog tsuas yog nyob rau hauv qhov du thiab ruaj khov dua qhov chaw tiav, tab sis kuj nyob rau hauv tus nqi-zoo ntawm cov tshuaj. Yog li ntawd, nws yog ib qho tsim nyog los lees paub thiab hais txog lub luag haujlwm tseem ceeb ntawm HPMC hauv kev lag luam kev tsim kho.
Lub sijhawm tshaj tawm: Lub Yim Hli-15-2023