Hydroxypropyl methylcellulose (HPMC), ua ib qho ntawm cov cellulose ethers tseem ceeb tshaj plaws hauv cov txheej txheem mortar qhuav niaj hnub no, ua lub luag haujlwm tseem ceeb hauv cov nplaum pobzeb. Nrog rau qhov loj ntawm cov pobzeb nce ntxiv, qhov nyuaj ntawm kev tsim kho ib puag ncig, thiab kev txhim kho tas mus li ntawm cov qauv kev sib txuas lus, lub luag haujlwm ntawm HPMC hauv cov qauv ua rau tseem ceeb dua. Txawm hais tias nws yog C1 / C2 hom nplaum pobzeb lossis cov nplaum ua haujlwm siab rau cov pobzeb hnyav, cov pobzeb loj, thiab cov pobzeb nqus dej tsawg, HPMC ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm, txhim kho kev ruaj khov, thiab nce kev sib txuas lus.
1. Txhim Kho Kev Khaws Dej Kom Paub Tseeb Tias Muaj Dej Txaus
Cov nplaum rau pobzeb yog cov nplaum nyias nyias, nrog rau qhov tuab ib txwm muaj li 3–5 hli. Lawv yooj yim rau kev poob dej sai vim yog lub substrate nqus dej sai, qhov kub thiab txias siab, lossis cua qhuav.
HPMC ua kom cov dej dawb nyob hauv zoo los ntawm kev tsim cov qauv sib txuas hauv cov mortar, ua rau cov nplaum pobzeb khaws dej tau zoo dua. Feem ntau, HPMC zoo tuaj yeem khaws dej tau txog 90% -98%.
Cov teebmeem ntawm kev khaws dej muaj xws li:
Ua kom qeeb qeeb ntawm cov dej noo ntawm cov cement, txhim kho lub zog sib txuas;
Tiv thaiv kom tsis txhob muaj dej poob thaum ntxov, tawg, thiab tawg ua tej daim me me;
Txhim kho qhov ruaj khov ntawm cov nplaum pobzeb rau cov pobzeb uas nqus dej tsawg (xws li cov pobzeb porcelain thiab cov pobzeb glazed).
2. Txhim kho cov khoom rheological thiab txhim kho kev ua haujlwm tau zoo
Kev ua haujlwm tau zoo yog qhov qhia tseem ceeb ntawm seb cov neeg ua haujlwm tsim kho puas yuav txais yuav cov nplaum pobzeb. HPMC txhim kho cov khoom rheological ntawm cov mortar, ua rau cov nplaum pobzeb nthuav dav zoo dua thiab thixotropy.
Cov tsos mob tseem ceeb ntawm kev txhim kho rheology:
Zoo thixotropy: Shear thinning, yooj yim rau kis; rov qab sai tom qab sawv, tsis muaj sagging.
Kev nplua nplua zoo dua: Ua rau kev txhuam yooj yim dua, txhim kho kev ua haujlwm ntawm kev tsim kho.
Txhim kho qhov sib npaug thiab ruaj khov ntawm cov nplaum: Tiv thaiv kev faib ua pawg, kev sib cais, thiab kev los ntshav.
Rau cov vuas loj thiab cov vuas phab ntsa uas muaj zog ntau, cov khoom thixotropic ntawm HPMC yog qhov tseem ceeb heev, tiv thaiv kev plam ntawm cov vuas thiab txhim kho kev ua haujlwm tiv thaiv kev plam ntawm cov chaw ntsug.
3. Lub Sijhawm Qhib thiab Lub Sijhawm Kho Kom Zoo Dua
Hauv kev tsim cov nplais pobzeb niaj hnub no, kev ncua sijhawm qhib ua rau kev ua haujlwm ntawm cov pobzeb zoo dua thiab txo qis kev ua haujlwm dua.
HPMC ncua qhov kev ua kom cov dej ntawm qhov chaw ntawm cov mortar evaporation, ua kom cov mortar noo thiab muab sijhawm ntau rau cov neeg ua haujlwm kom ua tiav kev tso thiab kho.
Cov teebmeem ib txwm muaj:
Lub sijhawm qhib tuaj yeem ntev mus txog 20-30 feeb.
Lub sijhawm hloov kho ntxiv ua rau yooj yim rau kev tso cov vuas loj.
HPMC yog cov khoom siv tseem ceeb rau C2 hom nplaum pobzeb ua haujlwm siab uas xav tau lub sijhawm qhib ntev.
4. Kev Txhim Kho Lub Zog thiab Kev Ruaj Ntseg ntawm Cov Qauv
HPMC tsis yog "cov khoom sib txuas" hauv kev nkag siab txog tshuaj lom neeg, tab sis nws txhim kho lub zog sib txuas ntawm cov nplais pobzeb los ntawm kev txhim kho cov txheej txheem hydration cement, ua kom zoo dua cov qauv mortar, thiab ua kom cov mortar ntom dua.
Kev txhim kho suav nrog:
Kev khaws dej ua rau muaj dej ntau ntxiv, yog li ua rau muaj cov khoom CSH gel ntau dua.
Txhim kho cov qauv mortar thiab txhim kho kev sib txuas lus interfacial.
Tiv thaiv cov qhov tsis sib xws thiab txhim kho qhov zoo thiab kev ruaj khov ntawm kev sib txuas.
Nws cov nyhuv yog qhov pom tseeb tshwj xeeb hauv kev sib txuas ntawm cov vuas vitrified thiab cov vuas uas nqus dej tsawg.
5. Kev Tiv Thaiv Kev Poob Qis thiab Kev Tiv Thaiv Kev Poob Qis
Kev tiv thaiv kev plam thaum lub sijhawm teeb tsa vuas ntsug yog qhov cim qhia tseem ceeb rau cov nplaum vuas.
Cov khoom thixotropic siab ntawm HPMC tso cai rau cov nplais nplaum kom rov qab tau lub zog ntawm cov qauv tom qab thov, tiv thaiv cov pobzeb kom tsis txhob swb vim lawv qhov hnyav.
Tshwj xeeb tshaj yog nyob rau hauv kev tsim cov vuas loj thiab cov vuas glazed loj, cov viscosity siab, hloov HPMC kom haum yog qhov tseem ceeb rau kev tiv thaiv kev plam.
6. Cov Lus Qhia Txog Kev Xaiv Tshuaj HPMC thiab Viscosity
Hauv cov qauv nplaum pobzeb, qhov ntau ntawm HPMC feem ntau tsawg, tab sis nws qhov cuam tshuam yog qhov tseem ceeb.
Tus nqi ntxiv feem ntau: 0.2% –0.4%
Qhov ntau npaum li cas nyob ntawm: hom cement, qhov sib piv ntawm cov khoom siv, qhov chaw tsim kho, thiab qhov loj ntawm pobzeb. Cov Lus Qhia Txog Viscosity (25°C, 2% kua):
Cov nplaum rau pobzeb hom C1 txheem: 40,000–60,000 mPa·s
Cov nplaum C2 hom pobzeb ua haujlwm tau zoo: 75,000–100,000 mPa·s lossis siab dua
Cov nplaum rau cov vuas loj: ≥100,000 mPa·s, qib thixotropic siab
HPMC, ua ib yam khoom siv tseem ceeb hauv cov txheej txheem nplaum pobzeb, muaj cov txiaj ntsig zoo hauv kev txhim kho kev khaws dej, rheology, lub zog sib txuas, thiab kev tiv thaiv kev plam. Txawm hais tias rau kev teeb tsa pobzeb phab ntsa thiab pem teb lossis daim ntawv thov pobzeb loj, kev xaiv thiab kev siv HPMC zoo yog qhov tseem ceeb rau kev ua kom ruaj khov ntawm cov nplaum pobzeb thiab kev tsim kho zoo. Rau cov chaw tsim khoom nplaum pobzeb uas nrhiav kev ua tau zoo, kev xaiv qib HPMC tsim nyog yog qhov tseem ceeb.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-11-2025