Hydroxypropylmethylcellulose (HPMC) tau txais txiaj ntsig hauv kev tsim kho kev lag luam vim nws cov dej tuav tau zoo heev. HPMC yog non-ionic, dej-soluble cellulose ether, uas yog dav siv nyob rau hauv ntau yam lag luam. Hauv kev tsim kho, nws feem ntau yog siv los ua cov thickener, binder thiab dej-retaining tus neeg sawv cev hauv cov ntaub ntawv cement thiab mortars. Qhov zoo ntawm HPMC kuj muaj qee yam cuam tshuam rau nws cov dej khaws cia, uas peb yuav tshawb hauv kab lus no.
Ua ntej, nws yog ib qho tseem ceeb kom nkag siab tias HPMC yog dab tsi thiab nws ua haujlwm li cas. HPMC yog derivative ntawm cellulose, ib tug natural polymer muab tau los ntawm ntoo thiab nroj fibers. HPMC yog tsim los ntawm kev hloov kho cellulose nrog propylene oxide thiab methyl chloride, uas ntxiv hydroxypropyl thiab methyl pawg rau cellulose molecule. Cov kev hloov kho no ua rau HPMC ntau soluble hauv dej thiab muab cov khoom tshwj xeeb xws li thickening, emulsification thiab dej tuav.
Cov dej tuav cov khoom ntawm HPMC yog qhov tseem ceeb tshwj xeeb hauv kev tsim kho kev lag luam, qhov chaw tswj dej noo yog qhov tseem ceeb. Thaum HPMC muab ntxiv rau cov khoom siv cementitious lossis mortar, nws tsim ib zaj duab xis nyob ib ncig ntawm cov cement, txo cov dej nkag. Cov zaj duab xis kuj tseem pab kom qeeb cov evaporation ntawm cov dej los ntawm kev sib tov, muab cov cement ntau lub sij hawm kom hydrate. Yog li ntawd, cov ntaub ntawv cementitious thiab mortars tseem ntub rau lub sijhawm ntev, cia lawv kho kom zoo thiab ua tiav lub zog siab tshaj plaws.
Qhov zoo ntawm HPMC ua lub luag haujlwm tseem ceeb hauv nws txoj kev tuav dej. Feem ntau hais lus, qhov zoo dua ntawm HPMC cov khoom, qhov zoo dua cov dej tuav. Qhov no yog vim hais tias me me muaj thaj tsam loj dua, uas tso cai rau lawv los tsim ib zaj duab xis dav nyob ib ncig ntawm cov cement hais. Cov zaj duab xis pab tsim ib qho kev thaiv ntawm cov cement thiab dej, ua kom cov dej nkag mus rau hauv qhov sib tov qeeb. Yog li ntawd, qhov sib tov nyob twj ywm ntub dej ntev dua, muab sijhawm ntau rau cov cement kom hydrate thiab mortar kho.
Tab sis nws tsim nyog sau cia tias qhov zoo ntawm HPMC yuav tsum tsis yog tib qho kev txiav txim siab thaum xaiv tus neeg saib xyuas dej. Lwm yam xws li hom cement, dej-cement piv, kub thiab av noo kuj cuam tshuam rau cov dej tuav ntawm HPMC. Yog li ntawd, nws yog ib qho tseem ceeb uas yuav tau xaiv HPMC cov khoom tsim nyog rau cov ntawv thov tshwj xeeb thiab siv ib puag ncig.
Hauv cov ntsiab lus, muaj ntau qhov zoo rau kev siv HPMC ua tus neeg saib xyuas dej hauv cov ntaub ntawv cementitious thiab mortars. Nws cov dej tuav cov khoom kom ntseeg tau tias qhov sib tov tseem ntub rau ntev, muab sijhawm ntau rau cov cement kom hydrate thiab mortar los kho. Qhov zoo ntawm HPMC yog qhov tseem ceeb cuam tshuam rau nws lub peev xwm tuav dej, qhov zoo dua cov khoom, qhov ua tau zoo dua. Txawm li cas los xij, lwm yam xws li hom cement, dej-cement piv, kub thiab av noo yuav tsum tau txiav txim siab thaum xaiv cov khoom HPMC. Zuag qhia tag nrho, siv HPMC yog ib txoj hauv kev zoo los txhim kho kev ua haujlwm thiab kev ua haujlwm ntev ntawm cov ntaub ntawv cementitious thiab mortars hauv kev tsim kho kev lag luam.
Post lub sij hawm: Aug-16-2023