HydroxyPropyyl methylcellulose (HPMC)yog dej-soluble polymer feem ntau siv nyob rau hauv cov ntaub ntawv tsim. Nws yog dav siv nyob rau hauv xis mas cug, putty hmoov, nplais nplaum thiab lwm yam khoom. HPMC tsuas yog txhim kho qhov zoo ntawm cov khoom noj kom zoo ntawm cov khoom siv viscosity ntawm lub peev xwm, txhim kho kev ua haujlwm hauv dej.
1. Cov nyhuv ntawm HPMC ntawm Dej Tuav Tseg ntawm Caas Cug
Cov dej ua kom xis nyob ntawm cov txiv ntoo cug hais txog kev muaj peev xwm ntawm kev culture los khaws dej ua ntej nws ua tiav kiag li. Cov dej zoo yuav pab cov kev dej haus tag nrho thiab tiv thaiv kev tawg thiab lub zog poob los ntawm kev poob ntau dhau. HPMC txhim kho cov dej ua kom xis nyob ua cov kev sib hloov ua hauv qab no:
Nce system viscosity
Tom qab HPMC yws nyob rau hauv xis mas qauv, nws tsim cov khoom siv messs, nce cov kab tsuag ntawm lub tshuaj khib thiab txo cov dej tsis pub dawb, yog li kev txhim kho dej rov qab. Cov yam ntxwv no yog tshwj xeeb yog qhov tshwj xeeb tshaj yog rau kev siv kub kub nyob rau lub caij ntuj sov lossis rau cov txheej txheem hauv paus nrog dej nqus dej.
Sib sau cov dej noo noo
HPMC lwg me me muaj cov dej nqus dej muaj zog, thiab nws cov tshuaj yuav tsim cov yeeb yaj kiab hydration ib ncig ntawm cov dej sib khi thiab ua kom qeeb tus nqi ntawm cov dej evaporation thiab nqus. Cov yeeb yaj kiab dej no tuaj yeem tswj cov dej sib xyaw hauv cov tshuaj khib, tso cai rau cov cement dej tshuaj tiv thaiv kom ua tiav.
Txo kom los ntshav
HPMC muaj peev xwm txo cov kab tshuaj khib, uas yog, qhov teeb meem ntawm cov dej ua ntej los ntawm cov cug tshuaj thiab ntab dej tom qab lub cug sib xyaw. Los ntawm kev nce viscosity thiab nto nro txog cov kua aqueous ntawm cov apidation ntawm cov dej sib xyaw, thiab yog li txhim kho cov kev sib xyaw ua ke thiab muaj kev ruaj ntseg ntawm lub cug.
2. Cov nyhuv ntawm HPMC ntawm cov muaj pes tsawg leeg cug
Lub luag haujlwm ntawm HPMC hauv collch cug tsis txwv rau cov dej khaws cia, tab sis kuj cuam tshuam nws cov lus thiab kev ua tau zoo, raws li qhia hauv qab no:
Cuam tshuam rau cov txheej txheem cement
Qhov kev sib txuas ntawm HPMC yuav qeeb txoj kev haus hydration ntawm kev cement cov khoom ntawm cov txheej txheem ntawm cov dej, uas yog qhov ua rau muaj kev sib dhos ntawm cov qauv tshuaj vug. Qhov kev ncua qeeb no tuaj yeem txo cov shrinkage thaum ntxov thiab txhim kho lub catch captance ntawm cug cug.
Hloov kho cov khoom siv hluav taws xob ntawm cug
Tom qab dissolving, HPMC tuaj yeem nce cov plasticity thiab kev ua haujlwm ntawm cov ntawv cug, ua kom zoo nkauj thaum ntawv thov lossis tsis tshua los ntshav thiab sib cais. Lub sijhawm tib lub sijhawm, HPMC tuaj yeem muab kaw qee qhov thixotropy, yog li nws tau tswj lub zog viscosity siab thaum sawv ntawm shear zog, uas muaj txiaj ntsig rau kev ua haujlwm.
Cuam tshuam rau kev ua tau zoo ntawm kev tshuaj khib
Thaum HPMC txhim kho kev ua tshuaj khib, nws kuj tseem muaj qee yam cuam tshuam rau nws lub zog kawg. Txij li thaum HPMC yuav tsim ib zaj duab xis hauv xis mas cov khoom ntawm cov khoom lag luam dej hauv lub sijhawm luv luv, ua rau lub zog thaum ntxov kom txo qis. Txawm li cas los xij, raws li cov cement hydration txuas ntxiv, noo noo khaws los ntawm HPMC tuaj yeem txhawb nqa cov tshuaj tiv thaiv tom ntej, kom lub zog kawg tuaj yeem hloov kho.
Raws li ib qho tseem ceeb ntxiv rau cov xis tsw qab,HPMCtuaj yeem txhim kho dej cug, txo cov dej poob, txhim kho cov txheej txheem kev tsim kho ntawm cov kev tsim kho kom zoo rau qee yam. Los ntawm kho cov tshuaj HPMC, sib npaug zoo tshaj plaws ntawm dej khaws cia, kev ua haujlwm thiab lub zog tuaj yeem pom tau tias yuav tsum tau ua kom tau raws li cov xwm txheej sib txawv. Hauv kev tsim kho cov dej num, kev siv hluav taws xob muaj kuab ntawm HPMC yog qhov tseem ceeb rau kev txhim kho collhu zoo thiab nthuav dav divability.
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