Hydroxypropyl methylcellulose (HPMC)yog ib qho cellulose ether uas tsis yog ionic siv dav hauv cov ntaub ntawv siv hauv kev tsim kho, tshwj xeeb tshaj yog hauv cov mortar qhuav. Cov mortar qhuav yog cov khoom siv hauv kev tsim kho niaj hnub uas ua ntej sib tov ntau yam khoom siv raw (xws li cement, xuab zeb, cov khoom sau thiab cov khoom ntxiv) hauv qee qhov sib piv hauv lub Hoobkas. Thaum siv, nws tsuas yog xav tau ntxiv dej thiab do kom tsim. HPMC, ua ib qho khoom ntxiv tseem ceeb, ua lub luag haujlwm tseem ceeb hauv cov mortar qhuav, txhim kho kev ua tau zoo tag nrho thiab kev tsim kho zoo ntawm cov mortar.
1. Txhim kho kev khaws dej thiab ntev lub sijhawm qhib
HPMC muaj cov yam ntxwv zoo uas khaws dej tau zoo. Thaum lub sijhawm tsim kho, nws tuaj yeem tsim ib daim nyias nyias hauv cov mortar, ua rau qeeb qeeb ntawm cov dej evaporation, yog li cov dej tuaj yeem khaws cia rau hauv cov mortar ntev dua. Qhov no yog qhov tseem ceeb tshwj xeeb rau cov tshuaj tiv thaiv cement hydration, uas pab txhim kho lub zog thiab kev sib txuas ntawm cov mortar thiab zam cov teeb meem zoo xws li tawg thiab hollowing los ntawm kev poob dej ntau dhau. Tsis tas li ntawd, HPMC kuj tseem tuaj yeem ntev lub sijhawm qhib ntawm cov mortar, muab sijhawm ntau rau cov neeg ua haujlwm tsim kho los kho thiab hloov kho, thiab txhim kho kev ywj pheej thiab kev ua haujlwm zoo ntawm kev tsim kho.
2. Txhim kho kev tsim kho thiab kev ua haujlwm
HPMC muab cov mortar qhuav sib xyaw zoo thiab du, ua rau nws yooj yim dua rau kev siv, du thiab calender. Nws cov nyhuv thickening tuaj yeem txhim kho thixotropy ntawm cov mortar, ua rau cov mortar ntau dua thaum do lossis siv zog, thiab tuaj yeem rov qab tau nws qhov sib xws sai sai thaum nws nyob ruaj khov, uas yog qhov zoo rau nws txoj kev ruaj khov ntawm qhov chaw ntsug thiab txo qhov sagging. Rau ntau yam khoom mortar qhuav sib xyaw xws li cov nplaum pobzeb, plaster mortar, thiab mortar hauv pem teb, HPMC tuaj yeem txhim kho nws cov kev ua tau zoo hauv kev tsim kho, yog li txhim kho kev ua haujlwm hauv kev tsim kho thiab qhov zoo ntawm qhov chaw.
3. Txhim kho kev ua tau zoo ntawm kev sib txuas
HPMC muaj txiaj ntsig zoo rau kev txhim kho lub zog sib txuas ntawm cov mortar. Nws cov qauv molecular cellulose muaj kev ua haujlwm zoo ntawm qhov chaw, uas tuaj yeem txhim kho qhov sib txuas ntawm cov mortar thiab substrate, thiab tiv thaiv kev tawg thiab hollowing. Hauv cov khoom xws li cov nplaum pobzeb thiab tus neeg sawv cev interface, ntxiv HPMC tuaj yeem ua kom cov vuas thiab substrates sib txuas ruaj khov, hloov kho rau ntau yam ntaub ntawv pobzeb thiab hom substrate, thiab txhim kho tag nrho lub zog sib txuas thiab ruaj khov.
4. Txhim kho kev tiv thaiv kev plam thiab kev khaws cia cov duab
Thaum lub sijhawm tsim phab ntsa lossis tso vuas, kev tiv thaiv kev plam yog ib qho cim qhia tseem ceeb. HPMC tuaj yeem txhim kho lub peev xwm tiv thaiv kev plam ntawm cov mortar, yog li nws tseem tuaj yeem tswj tau qhov chaw ruaj khov thaum tso cov vuas hnyav lossis cov pob zeb loj, tsis muaj kev swb, thiab xyuas kom meej tias kev tsim kho zoo. Tsis tas li ntawd, cov khoom tuab ntawm HPMC tuaj yeem tswj tau cov duab ntawm cov mortar thiab tiv thaiv kev sagging lossis ntws thaum lub sijhawm tsim cov txheej tuab. Nws yog qhov tshwj xeeb tshaj yog rau kev tsim kho hauv cov khoom nyuaj xws li lub ntsej muag thiab qab nthab.
5. Txhim kho qhov sib xws ntawm cov mis thiab siv rau ntau yam kev sib xyaw qhuav
HPMC muaj kev ruaj khov tshuaj zoo thiab ntau yam kev sib xws ntawm cov mis, thiab tuaj yeem ua haujlwm nrog ntau yam khoom siv inorganic gelling thiab polymer emulsions. Nws yog qhov tsim nyog rau ntau yam tshuab xws li cement-based, gypsum-based, thiab lime-based. Nws tsis tsuas yog tuaj yeem ruaj khov cov qauv ntawm lub tshuab, tab sis kuj txhim kho qhov sib koom ua ke ntawm ntau yam khoom thiab txhim kho kev ua haujlwm tag nrho. Qhov kev hloov pauv no ua rau nws yog ib qho ntawm cov khoom siv feem ntau siv thiab txhim khu kev qha hauv cov tshuaj qhuav-mix.
6. Txhim kho qhov tawg tsis kam thiab ua kom ruaj khov
Vim yog qhov cuam tshuam ntawm HPMC thiab kev ua kom zoo dua ntawm cov qauv me me ntawm cov mortar, nws tuaj yeem txo qhov teeb meem tawg uas tshwm sim los ntawm kev ntsws lossis dej tsis sib npaug hauv theem tom qab ntawm kev tsim kho, thiab txhim kho qhov tsis kam ntawm mortar. Tib lub sijhawm, cov zaj duab xis tiv thaiv polymer uas tsim los ntawm nws tuaj yeem txhim kho qhov tsis kam ntawm te, tiv thaiv dej thiab tiv thaiv kev laus ntawm mortar mus rau qee qhov, thiab txuas ntxiv lub neej ua haujlwm ntawm cov khoom siv hauv tsev.
7. Kev tiv thaiv ib puag ncig, kev nyab xeeb, tsis muaj tshuaj lom thiab tsis ua rau muaj kev phom sij
HPMC yog los ntawm cov nroj tsuag ntuj tsim thiab ua tom qab hloov kho tshuaj lom neeg. Nws muaj kev puas tsuaj zoo thiab tsis ua rau ib puag ncig puas tsuaj. Nws yuav tsis tso cov pa phem thaum siv, tsis muaj tshuaj lom thiab tsis ua rau cov neeg ua haujlwm tsim kho tsis zoo, thiab ua raws li lub tswv yim tam sim no ntawm kev tsim kho ntsuab thiab kev txhim kho kom ruaj khov.
Ua ib qho khoom siv ntxiv uas tseem ceeb heev rau kev ua haujlwm siabcov av sib xyaw qhuav HPMCmuaj lub luag haujlwm tseem ceeb hauv kev khaws dej, kev ua haujlwm ntawm kev tsim kho, kev nplaum, cov khoom tiv thaiv kev plam, thiab lwm yam, uas tsis yog tsuas yog txhim kho kev ua haujlwm ntawm cov tshuaj mortar qhuav xwb, tab sis kuj txhawb nqa kev ua tus qauv, kev lag luam thiab kev ua haujlwm ntawm cov txheej txheem tsim kho niaj hnub. Raws li kev lag luam kev tsim kho qhov xav tau rau kev tsim kho zoo thiab kev ua haujlwm txuas ntxiv mus, kev siv HPMC yuav dav dua, thiab nws cov thev naus laus zis thiab cov khoom yuav txuas ntxiv mus rau qhov zoo tshaj plaws thiab kev tsim kho tshiab, txhaj tshuaj ntau dua rau hauv kev lag luam khoom siv hauv tsev.
Lub sijhawm tshaj tawm: Tsib Hlis-19-2025