HydroxyPropyyl methylulose (HPMC) yog ib qho zoo heev organic polymer dav siv hauv cov khoom siv hauv tsev, tshwj xeeb tshaj yog nyob rau hauv kev hloov kho cov khoom noj khoom haus. Cov khoom siv cement-raws li cug, putty thiab qhob tau siv dav hauv kev tsim kho kev tsim kho. Nws cov nplaum yog qhov tseem ceeb cuam tshuam rau kev tsim kho cov khoom siv zoo thiab ntev. Cov khoom siv ua kom cov txiv duaj yog feem ntau tau tshaj tawm rau cov nplaum tsis txaus, tshwj xeeb yog cov hauv paus nto yog cov npoo du lossis muaj tseeb. Yog li ntawd, txhim kho nws cov nplaum tau dhau los ua qhov teeb meem tseem ceeb. HPMC tau pom cov txiaj ntsig zoo tshaj plaws hauv kev txhim kho cov nplaum ntawm cov khoom noj yog tias cov khoom siv xis mas raws li nws cov qauv tshuaj lom thiab cov yam ntxwv.
1. Tshuaj lom neeg thiab cov tshuab kev ua ntawm HPMC
HPMC yog dej-soluble tsis muaj tseeb cellulose cellulose tsim los ntawm kev hloov tshuaj lom neeg ntawm ntuj cellulose. Nws cov qauv tshuaj tshwj xeeb muab nws cov dej ua kom zoo, thickening thiab zaj duab xis-ua cov khoom. Cov khoom no ua tau lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm ntawm cov khoom siv Maa.
Txhim Kho Cov Khoom Siv Dej
Ib qho ntawm cov haujlwm tseem ceeb ntawm HPMC yog txhawm rau txhim kho cov dej khaws cia ntawm cov khoom noj khoom haus. Thaum lub sij hawm tsim qauv ntawm cov ntawv tso cai, tshwj xeeb tshaj yog nyob rau hauv cov dej ntws tsis txaus, yog li cuam tshuam nws cov nplaum thiab lub zog. HPMC muaj cov dej nqus dej zoo thiab muaj peev xwm ua kom muaj dej noo noo thiab ua kom cov xis nyob kom ncua lub zog ntawm cov khoom.
Txhim kho qhov ua haujlwm thiab lubricity
HPMC tuaj yeem nce cov khoom siv thiab viscosity ntawm cov khoom noj kom haum rau cov khoom noj. Hauv kev siv cov kev siv, ua haujlwm zoo txhais tau tias cov khoom tuaj yeem sib kis tau tusyees yam tsis muaj dej dhau los yog qhuav dhau, ua rau txo cov nplaum. Los ntawm nce lub viscosity ntawm cov khoom siv, HPMC muab cov khoom siv rau qee cov txheej txheem ntawm slurry, yog li txhim kho cov nplaum ntawm cov cement lossis tsis xwm yeem.
Ncua Sijhawm Qhib Sijhawm
Lub sijhawm qhib ntawm cov khoom siv Maas-based, piv txwv li lub sijhawm los ntawm kev ua tiav ntawm kev sib xyaw rau lub sijhawm thaum muaj kev tsim qauv ploj mus, yog qhov kev ua phem. Cov khoom siv coased-raws li cov khoom siv tau sai dhau thiab muaj lub sijhawm qhib luv luv, uas tuaj yeem ua tau yooj yim rau cov teeb meem adhesion thaum kev tsim kho. Los ntawm kev ncua ntawm cov dej evaporation, HPMC tseem ceeb txuas lub sij hawm qhib cov khoom noj khoom haus kom ntseeg tau tias cov khoom tiav rau saum npoo ntawm substrate.
Txhim kho cov khaub ncaws tsis kam
Rau kev tsim kho ntawm qee cov facades lossis inclined thaj chaw, swb tsis kam yog qhov ntsuas tseem ceeb ntawm cov khoom noj. HPMC tuaj yeem txhim kho cov nplais uas tsis kam ntawm cov khoom siv Maas-based thiab tiv thaiv cov ntaub ntawv los ntawm kev poob lossis poob thaum lub sijhawm tsim kho. Qhov no yog ua tiav los ntawm cov nyhuv tuab thiab zoo heev nto qaub ncaug ntawm HPMC, uas tuaj yeem tiv thaiv cov khoom los ntawm cov khoom siv ntawm lub ntsej muag, yog li kev txhim kho cov khoom siv ruaj khov thiab cov kua nplaum.
2. Cov nyhuv ntawm HPMC nyob rau microstructure ntawm cov khoom noj qabent-based
HPMC tsis yog txhim kho cov nplaum ntawm cov tsooses-raws li cov khoom siv ntawm macroscopic, tab sis kuj ua lub luag haujlwm tseem ceeb hauv cov khoom siv.
Ua ib qho quav dej tsim qauv qauv
HPMC txhawb nqa tag nrho cov dej ntawm cov khoom siv xws li tralcium silicate (C3S) thiab dicalcium silicate (C2s) hauv kev khaws dej, kom ntau dua cov pa roj ntsha li roj qab zib (CHS). Cov Gel no yog qhov tseem ceeb hauv kev txiav txim siab lub zog thiab cov nplaum nplaum ntawm cov cement. HPMC tuaj yeem pab ua cov xim tuab thiab txuas ntxiv csh gel network, txhim kho cov cohesion thiab cov nplaum ntawm cov khoom.
Txo qhov tshwm sim ntawm cov kab nrib pleb
Thaum lub sij hawm kho tus txheej txheem, cov khoom siv rau kev tso cai thiab txhim kho microcracks ntau zaus vim muaj dej poob thiab shrinkage. Cov dej khaws cia ntawm HPMC pab kom qeeb qeeb ntawm cov dej poob, yog li txo cov micro-nrib pleb tshwm sim los ntawm cov khoom noj ntawm cov theem ntawm txoj kev kho. Ib qho ntxiv, zaj duab xis tsim los ntawm HPMC muaj qee qhov kev kawm ntawm elasticity thiab tuaj yeem nqus ib feem ntawm kev ntxhov siab thiab tiv thaiv cov kev nthuav dav ntxiv. Qhov txo qis hauv cov nrib pleb ncaj ncaj rau txhim kho kom txhim kho cov nyiaj sib txuas thiab cov kav ntev ntawm cov khoom siv.
3. Cov ntawv thov piv txwv ntawm HPMC nyob rau hauv cov khoom sib cais sib txawv
Vuas nplaum nplaum
Nyob rau hauv cov nplais nplaum, adhesion yog ib qho ntawm cov khoom tseem ceeb tshaj plaws. Los ntawm nws cov thickening thiab dej khaws cia cov khoom lag luam, HPMC muab cov nplais nplaum kom khov kho kom khov kho rau cov txheej txheem kev tsim kho, tiv thaiv cov vuas los ntawm loosening thiab poob tawm. Nyob rau tib lub sijhawm, nws kuj tseem tuaj yeem txhim kho tiab swb tsis kam kom ntseeg tau tias cov vuas tsis txhob plam thaum paster.
Phab Ntsa Sab Nrauv Sab Nraud Putty
Daim ntawv thov ntawm HPMC nyob rau sab nrauv phab ntsa patty futty tuaj yeem txhim kho kom ruaj khov rau sab nrauv phab ntsa, tiv thaiv kom tsis txhob tawg lossis poob tawm vim yog kev ziab khaub ncaws heev. Tsis tas li ntawd, HPMC kuj tseem tuaj yeem txhim kho kev ua haujlwm ntawm kev ua haujlwm ntawm kev ua tiav, ua rau nws tau thov kom zoo dua thiab txhim kho cov txheej txheem.
HPMC tseem ceeb txhim kho cov nplaum ntawm cov khoom noj qabent-raws li cov khoom siv xws li dej cia, thickening, zaj duab xis-formed thiab txuas ntxiv qhib lub sijhawm. HPMC ua si lub luag haujlwm tseem ceeb hauv kev txhim kho cov haujlwm ua haujlwm ntawm cov khoom siv xiss-raws li lub zog ntawm lawv cov microstructure. Raws li kev tsim kho kev tsim kho txuas ntxiv txhawm rau kev ua haujlwm rau cov khoom siv kom zoo dua thiab cov kev daws teeb meem ntau dua rau cov khoom noj kom zoo ntawm cov cement-raws cov khoom.
Lub Sijhawm Post: Feb-17-2025