Hydroxypropylmethylcellulose (HPMC) yog cov khoom siv sib xyaw ua ke uas tau siv dav hauv ntau yam kev siv hauv kev tsim kho kev lag luam.Nws cov khoom tshwj xeeb ua rau nws muaj txiaj ntsig zoo hauv cov khoom siv hauv tsev, muab kev ua tau zoo thiab txhim kho cov khoom rau ntau yam khoom.
1. Taw qhia rau HPMC:
Hydroxypropylmethylcellulose yog cellulose ether muab los ntawm ntuj polymers, feem ntau cellulose.Nws yog synthesized los ntawm chemically modifying cellulose siv propylene oxide thiab methyl chloride, uas ua rau ib tug compound nrog hydroxypropyl thiab methyl pawg txuas mus rau lub cellulose qaum.Qhov kev hloov pauv ntawm cov pab pawg no cuam tshuam rau kev ua haujlwm ntawm HPMC.
2. Kev ua haujlwm ntawm HPMC:
Kev tuav dej: Ib qho ntawm cov khoom tseem ceeb ntawm HPMC yog nws lub peev xwm khaws dej.Hauv kev tsim cov ntawv thov, qhov no yog qhov tseem ceeb rau kev tswj xyuas kev ua haujlwm ntawm cov tshuaj khib thiab ua kom muaj dej kom zoo ntawm cov khoom siv cementitious.
Thickener: HPMC yog ib qho zoo thickener uas ua rau kom cov viscosity ntawm cov ntaub ntawv siv xws li cov nplaum, coatings thiab cov khoom sib txuas.
Txhim kho kev ua haujlwm zoo: HPMC pab txhim kho kev ua haujlwm thiab kev khaws cia ntawm cov ntaub ntawv cementitious, ua kom yooj yim rau kev tswj thiab siv.
Kev tswj kev teeb tsa: Nws cuam tshuam rau lub sijhawm teeb tsa ntawm cov ntaub ntawv cement thiab muab kev tswj kom zoo dua ntawm cov txheej txheem teeb tsa.
Zaj duab xis tsim: HPMC tsim cov yeeb yaj kiab nyias, hloov tau yooj yim ntawm qhov chaw, pab ua kom cov xim muaj zog dua thiab tsis muaj dej.
Txhim kho Adhesion: Nws txhim kho adhesion ntawm cov ntaub ntawv hauv tsev, txhawb kev sib raug zoo ntawm cov substrates.
3. Kev siv HPMC hauv kev tsim kho:
3.1 mortars thiab plasters:
Kev tuav dej: HPMC feem ntau yog siv rau hauv mortars thiab plasters los txhim kho cov dej tuav, tiv thaiv kom qhuav ntxov ntawm qhov sib tov thiab ua kom tiav cov dej ntawm cov cement.
Kev ua haujlwm tau zoo: Kev sib ntxiv ntawm HPMC txhim kho kev ua haujlwm ntawm cov mortar, ua rau kev tsim kho thiab ua tiav yooj yim dua.
Adhesion: Nws txhim kho qhov adhesion ntawm mortar thiab stucco rau ntau yam substrates, ua rau muaj zog dua, ruaj khov.
3.2 Pobzeb adhesives thiab grouts:
Slip Resistance: Hauv cov nplais nplaum nplaum, HPMC pab tswj kev sib txhuam kom ntseeg tau tias cov nplais ua kom ruaj khov rau saum npoo.
Thickening: Raws li tus neeg sawv cev thickening, HPMC pab txhawb kom zoo sib xws ntawm cov nplais nplaum thiab grouts.
Kev tuav dej: Nws tiv thaiv cov evaporation sai ntawm cov dej thiab txhawb kev kho kom zoo ntawm cov nplaum thiab grout.
3.3 Cement-based rendering:
Crack Resistance: HPMC txhim kho qhov yooj yim thiab tawg tsis kam ntawm cov cement-based renders, muab cov kav ntev rau qhov ua tiav.
Consistency: Nws pab tswj qhov xav tau qhov sib xws ntawm qhov ua tiav thaum lub sijhawm tsim kho, tiv thaiv sagging thiab kom ntseeg tau cov tuab tuab.
3.4 Self-leveling compounds:
Flow: Ntawm nws tus kheej-leveling compounds, HPMC txhim kho kev ntws, ua kom sib kis tau yooj yim dua.
Kev tuav dej: Nws tiv thaiv kom tsis txhob ya raws sai, ua kom muaj kev kho kom zoo thiab txhim kho cov khoom xav tau.
3.5 Gypsum khoom:
Kev sib raug zoo: HPMC yog siv rau hauv cov khoom siv gypsum los tswj qhov sib xws thiab teeb tsa lub sijhawm.
Kev tuav dej: Nws tiv thaiv kev ziab ntxov ntxov ntawm cov plaster sib tov thiab txhawb nqa dej kom huv.
4. Cov txiaj ntsig ntawm kev siv HPMC hauv kev tsim kho:
Txhim kho kev ua tau zoo: HPMC txhim kho cov txheej txheem ntawm cov khoom siv hauv tsev, ua kom yooj yim rau kev tswj thiab siv.
Kev tuav dej: Cov dej tuav dej ntawm HPMC pab txhawb kev kho kom zoo ntawm cov ntaub ntawv cementitious.
Kev sib txuas thiab kev sib txuas: Nws txhim kho kev sib txuas thiab kev sib txuas ntawm cov khoom siv hauv tsev, yog li ua rau cov qauv muaj zog thiab ruaj khov.
Thickening: Raws li lub thickener, HPMC muab qhov tsim nyog viscosity rau ntau yam khoom siv hauv tsev kom ntseeg tau tias siv tau zoo.
Crack resistance: Qhov sib ntxiv ntawm HPMC txhim kho qhov yooj yim thiab tawg tsis kam ntawm qhov tiav lawm.
Teem Sijhawm Tswjhwm: HPMC muab kev tswj xyuas zoo dua rau lub sijhawm teem sijhawm ntawm cov khoom siv cement.
5. Cov kev sib tw thiab kev txiav txim siab:
Dosage Control: Kev noj tshuaj kom raug yog qhov tseem ceeb kom ua tiav qhov kev xav tau thiab kev siv HPMC ntau dhau tuaj yeem ua rau muaj kev phom sij.
Compatibility: Compatibility nrog rau lwm yam additives thiab tsev cov ntaub ntawv yuav tsum tau txiav txim siab los tiv thaiv tej yam tsis zoo tshwm sim.
Kev cuam tshuam ib puag ncig: Thaum HPMC nws tus kheej raug suav hais tias muaj kev nyab xeeb, qhov cuam tshuam ib puag ncig ntawm nws cov khoom tsim thiab pov tseg yuav tsum raug txiav txim siab.
6. Xaus:
Hauv cov ntsiab lus, hydroxypropyl methylcellulose (HPMC) plays lub luag haujlwm tseem ceeb hauv kev tsim kho kev lag luam, muab ntau yam zoo hauv ntau yam kev siv.Nws cov khoom tshwj xeeb xws li dej tuav, thickening thiab txhim kho adhesion ua rau nws muaj txiaj ntsig zoo hauv kev tsim cov mortars, adhesives, plasters thiab lwm yam khoom siv hauv tsev.Txawm hais tias muaj kev sib tw nrog kev tswj hwm thiab ib puag ncig, HPMC qhov kev cuam tshuam zoo ntawm kev ua haujlwm thiab kev ua haujlwm ntev ntawm cov khoom siv tsim ua rau nws yog ib feem tseem ceeb ntawm cov cuab yeej siv niaj hnub no.Raws li kev tsim kho kev lag luam txuas ntxiv mus, HPMC zoo li yuav nyob twj ywm tseem ceeb hauv kev txhim kho qhov zoo thiab ua haujlwm ntawm cov khoom siv thiab cov txheej txheem.
Post lub sij hawm: Dec-18-2023