Hydroxypropyl methylcellulose (HPMC)yog ib qho dej-soluble polymer feem ntau siv hauv cov khoom siv hauv tsev. Nws yog dav siv hauv cement mortar, putty hmoov, pobzeb nplaum thiab lwm yam khoom. HPMC feem ntau txhim kho qhov zoo ntawm cov ntaub ntawv cement-based los ntawm kev ua kom cov viscosity ntawm lub kaw lus, txhim kho cov dej tuav thiab kho kev tsim kho.
1. Qhov cuam tshuam ntawm HPMC rau kev tuav dej ntawm cov cement mortar
Kev tuav dej ntawm cov cement mortar yog hais txog lub peev xwm ntawm mortar kom khaws cov dej ua ntej nws tag nrho. Kev tuav dej zoo pab kom muaj dej puv ntawm cov cement thiab tiv thaiv kev tawg thiab lub zog poob los ntawm kev poob dej ntau dhau. HPMC txhim kho cov dej tuav ntawm cov cement mortar raws li hauv qab no:
Nce qhov system viscosity
Tom qab HPMC dissolves nyob rau hauv cov cement mortar, nws tsim ib tug uniform mesh qauv, tsub kom lub viscosity ntawm lub mortar, tusyees faib dej nyob rau hauv lub mortar thiab txo cov dej dawb, yog li txhim kho dej tuav. Qhov no feature yog tshwj xeeb tshaj yog ib qho tseem ceeb rau high-temperature tsim nyob rau hauv lub caij ntuj sov los yog rau lub hauv paus txheej uas muaj zog nqus dej.
Ua ib qho kev thaiv dej noo
HPMC molecules muaj zog nqus dej, thiab nws cov tshuaj muaj peev xwm tsim ib tug hydration zaj duab xis nyob ib ncig ntawm cov cement hais, uas plays lub luag hauj lwm nyob rau hauv sealing dej thiab slowing down tus nqi ntawm cov dej evaporation thiab nqus. Cov yeeb yaj kiab dej no tuaj yeem tswj cov dej sib npaug hauv cov mortar, tso cai rau cov cement hydration cov tshuaj tiv thaiv mus ua haujlwm zoo.
Txo cov ntshav
HPMC tuaj yeem txo cov ntshav los ntawm mortar, uas yog, qhov teeb meem ntawm cov dej los ntawm cov mortar thiab ntab tuaj tom qab cov mortar sib xyaw. Los ntawm kev ua kom cov viscosity thiab qhov nro ntawm cov kua aqueous, HPMC tuaj yeem cuam tshuam kev tsiv teb tsaws ntawm cov dej sib xyaw hauv cov tshuaj khib nyiab, xyuas kom cov dej sib txawv ntawm cov txheej txheem cement hydration, thiab yog li txhim kho tag nrho cov uniformity thiab stability ntawm lub mortar.
2. Qhov cuam tshuam ntawm HPMC rau ntawm cov cement mortar
Lub luag haujlwm ntawm HPMC hauv cov cement mortar tsis txwv rau kev tuav dej, tab sis kuj cuam tshuam rau nws cov khoom thiab kev ua tau zoo, raws li qhia hauv qab no:
cuam tshuam rau cov txheej txheem cement hydration
Qhov sib ntxiv ntawm HPMC yuav ua rau txo qis cov dej ntawm cov cement hydration nyob rau theem pib, ua rau cov txheej txheem tsim cov khoom siv dej ntau dua, uas yog qhov tsim nyog rau qhov ntom ntom ntawm cov txheej txheem mortar. Qhov kev ncua sij hawm no tuaj yeem txo qis thaum ntxov shrinkage cracking thiab txhim kho qhov tawg tsis kam ntawm mortar.
Kho cov khoom rheological ntawm mortar
Tom qab kev sib cais, HPMC tuaj yeem ua kom cov yas thiab ua haujlwm ntawm mortar, ua kom nws smoother thaum lub sij hawm thov los yog tso, thiab tsis tshua muaj los ntshav thiab cais. Nyob rau tib lub sijhawm, HPMC tuaj yeem muab cov tshuaj khib nyiab rau qee yam thixotropy, kom nws tuav lub siab viscosity thaum sawv ntsug, thiab cov dej ntws tau zoo dua qub nyob rau hauv qhov kev txiav txim ntawm lub zog shear, uas yog pab rau kev tsim kho.
Influencing lub zog loj hlob ntawm mortar
Thaum HPMC txhim kho kev tsim kho ntawm mortar, nws kuj yuav muaj qee yam cuam tshuam rau nws lub zog kawg. Txij li thaum HPMC yuav tsim cov yeeb yaj kiab hauv cov cement mortar, nws yuav ncua kev tsim cov khoom siv dej hauv lub sijhawm luv luv, ua rau lub zog thaum ntxov. Txawm li cas los xij, raws li cov cement hydration txuas ntxiv, cov dej noo khaws cia los ntawm HPMC tuaj yeem txhawb cov tshuaj tiv thaiv dej tom qab, kom lub zog kawg tuaj yeem txhim kho.
Raws li ib qho tseem ceeb additive rau cement mortar,HPMCtuaj yeem txhim kho cov dej tuav ntawm mortar, txo cov dej poob, txhim kho kev tsim kho, thiab cuam tshuam rau cov txheej txheem cement hydration rau qee yam. Los ntawm kev kho qhov ntau npaum li cas ntawm HPMC, qhov sib npaug zoo tshaj plaws ntawm kev tuav dej, kev ua haujlwm thiab lub zog tuaj yeem nrhiav tau kom tau raws li qhov xav tau ntawm cov ntawv thov sib txawv. Nyob rau hauv kev tsim kho tej yaam num, kev siv lub ntsiab lus ntawm HPMC yog qhov tseem ceeb heev rau kev txhim kho mortar zoo thiab ua kom ntev.
Lub sij hawm xa tuaj: Mar-25-2025