Hydroxypropyl Methyl Cellulose (HPMC)yog ib qho tseem ceeb cellulose ether, uas yog siv dav hauv cov ntaub ntawv tsim kho, tshwj xeeb tshaj yog hauv mortar ua tus khaws dej thiab thickener. Qhov cuam tshuam ntawm kev khaws dej ntawm HPMC hauv mortar cuam tshuam ncaj qha rau kev ua haujlwm ntawm kev tsim kho, kev ruaj khov, kev txhim kho lub zog thiab kev tiv thaiv huab cua ntawm mortar, yog li nws daim ntawv thov ua lub luag haujlwm tseem ceeb hauv qhov zoo ntawm cov haujlwm tsim kho.
1. Cov kev cai khaws dej thiab cov teebmeem hauv cov mortar
Cov pob zeb mortar yog ib yam khoom siv nplaum uas siv ntau hauv cov haujlwm tsim kho, feem ntau yog siv rau kev ua masonry, plastering, kho, thiab lwm yam. Thaum lub sijhawm tsim kho, cov pob zeb mortar yuav tsum tswj hwm qee qhov dej noo kom ntseeg tau tias ua haujlwm tau zoo thiab lo rau. Kev ua kom cov dej hauv cov pob zeb mortar sai sai lossis dej poob ntau heev yuav ua rau muaj teeb meem hauv qab no:
Lub zog txo qis: Kev poob dej yuav ua rau tsis txaus cov tshuaj tiv thaiv cement, yog li cuam tshuam rau kev txhim kho lub zog ntawm cov mortar.
Kev sib txuas tsis txaus: Kev poob dej yuav ua rau kev sib txuas tsis txaus ntawm cov mortar thiab cov substrate, cuam tshuam rau kev ruaj khov ntawm cov qauv tsev.
Kev tawg qhuav thiab qhov khoob: Kev faib dej tsis sib npaug tuaj yeem ua rau cov txheej mortar ntsws thiab tawg, cuam tshuam rau qhov tsos thiab lub neej ua haujlwm.
Yog li ntawd, cov mortar xav tau lub peev xwm khaws dej tau zoo thaum lub sijhawm tsim kho thiab khov, thiab HPMC tuaj yeem txhim kho qhov khaws dej ntawm cov mortar, txhim kho kev ua haujlwm tsim kho thiab qhov zoo ntawm cov khoom tiav.
2. Cov txheej txheem khaws dej ntawm HPMC
HPMC muaj cov dej tuav tau zoo heev, feem ntau yog vim nws cov qauv molecular thiab cov txheej txheem ua haujlwm tshwj xeeb hauv cov tshuaj khib nyiab:
Kev nqus dej thiab nthuav dav: Muaj ntau pawg hydroxyl hauv cov qauv molecular ntawm HPMC, uas tuaj yeem tsim cov hydrogen bonds nrog cov dej molecules, ua rau nws nqus dej tau zoo heev. Tom qab ntxiv dej, HPMC molecules tuaj yeem nqus dej ntau thiab nthuav dav los ua ib txheej gel sib xws, yog li ncua qhov evaporation thiab poob dej.
Cov yam ntxwv ntawm kev tsim cov zaj duab xis: HPMC yaj hauv dej los ua cov kua nplaum siab, uas tuaj yeem tsim cov zaj duab xis tiv thaiv nyob ib puag ncig cov khoom me me. Cov zaj duab xis tiv thaiv no tsis tsuas yog tuaj yeem kaw cov dej noo zoo xwb, tab sis kuj txo qhov kev tsiv teb tsaws chaw ntawm cov dej noo mus rau hauv lub substrate, yog li txhim kho kev khaws cia dej ntawm cov mortar.
Cov nyhuv ua kom tuab: Tom qab HPMC yaj rau hauv dej, nws yuav ua rau cov mortar viscosity ntau ntxiv, uas pab kom faib thiab khaws cov dej kom sib npaug thiab tiv thaiv cov dej kom tsis txhob ntws lossis poob sai dhau. Cov nyhuv ua kom tuab kuj tseem tuaj yeem txhim kho kev ua haujlwm ntawm cov mortar thiab txhim kho nws cov kev ua haujlwm tiv thaiv kev sagging.
3. Kev khaws dej HPMC txhim kho kev ua tau zoo ntawm cov mortar
HPMC txhim kho qhov kev khaws cia dej ntawm cov mortar, uas tsis ncaj qha muaj qhov cuam tshuam zoo rau nws cov khoom siv lub cev thiab tshuaj lom neeg. Nws tau pom tseeb hauv cov hauv qab no:
3.1 Txhim kho qhov ua haujlwm tau ntawm cov mortar
Kev ua haujlwm zoo tuaj yeem ua kom ntseeg tau tias kev tsim kho du. HPMC ua rau cov mortar viscosity thiab dej khaws cia, yog li cov mortar tseem ntub thaum lub sijhawm tsim kho, thiab tsis yooj yim rau stratify thiab precipitate dej, yog li txhim kho kev ua haujlwm ntawm kev tsim kho.
3.2 Ua kom lub sijhawm qhib ntev dua
Kev txhim kho ntawm HPMC dej khaws cia tuaj yeem ua rau cov mortar noo ntev dua, ntev lub sijhawm qhib, thiab txo qhov tshwm sim ntawm cov mortar tawv vim dej poob sai thaum lub sijhawm tsim kho. Qhov no muab sijhawm ntev dua rau cov neeg ua haujlwm hauv kev tsim kho thiab pab txhim kho qhov zoo ntawm kev tsim kho.
3.3 Txhim kho lub zog ntawm cov mortar
Lub zog sib txuas ntawm cov mortar muaj feem cuam tshuam nrog cov tshuaj tiv thaiv hydration ntawm cement. Qhov khaws dej los ntawm HPMC ua kom ntseeg tau tias cov cement me me tuaj yeem tau hydrated tag nrho, zam kev sib txuas tsis txaus los ntawm kev poob dej thaum ntxov, yog li ua kom zoo dua qhov kev sib txuas ntawm cov mortar thiab cov substrate.
3.4 Txo qhov ntsws thiab tawg
HPMC muaj kev ua tau zoo heev ntawm kev khaws dej, uas tuaj yeem txo qhov kev poob dej sai sai, yog li zam kev ntsws thiab kev tawg ntawm cov dej poob thaum lub sijhawm teeb tsa ntawm cov mortar, thiab txhim kho qhov zoo li thiab kev ua haujlwm ntev ntawm cov mortar.
3.5 Txhim kho qhov khov-thaw tsis kam ntawm cov mortar
Kev khaws cia dej ntawmHPMCua rau cov dej hauv cov mortar faib sib npaug zos, uas pab txhim kho qhov ceev thiab kev sib npaug ntawm cov mortar. Cov qauv sib npaug no tuaj yeem tiv taus kev puas tsuaj los ntawm cov voj voog khov-thaw hauv huab cua txias thiab txhim kho kev ruaj khov ntawm cov mortar.
4. Kev sib raug zoo ntawm qhov ntau ntawm HPMC thiab cov dej khaws cia cov nyhuv
Qhov ntau ntawm HPMC ntxiv yog qhov tseem ceeb rau qhov cuam tshuam ntawm cov mortar khaws dej. Feem ntau hais lus, ntxiv qhov ntau ntawm HPMC kom tsim nyog tuaj yeem txhim kho qhov khaws dej ntawm mortar, tab sis yog tias ntxiv ntau dhau, nws yuav ua rau mortar viscous dhau, cuam tshuam rau kev ua haujlwm thiab lub zog tom qab hardening. Yog li ntawd, hauv kev siv ua haujlwm, qhov ntau ntawm HPMC yuav tsum tau tswj hwm kom raug raws li cov mis tshwj xeeb thiab cov kev cai tsim kho ntawm mortar kom ua tiav qhov zoo tshaj plaws khaws dej.
Ua ib qho tseem ceeb uas khaws dej thiab ua kom tuab, HPMC ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev khaws dej ntawm cov mortar. Nws tsis tsuas yog tuaj yeem txhim kho qhov ua haujlwm tau zoo thiab kev ua haujlwm ntawm cov mortar, tab sis kuj ua kom lub sijhawm qhib ntev dua, txhim kho lub zog sib txuas, txo qhov tawg ntawm shrinkage, thiab txhim kho qhov ruaj khov thiab khov-thaw tsis kam ntawm mortar. Hauv kev tsim kho niaj hnub no, kev siv HPMC tsim nyog tsis yog tsuas yog daws tau qhov teeb meem ntawm kev poob dej ntawm mortar, tab sis kuj ua kom zoo ntawm qhov project thiab txuas lub neej kev pabcuam ntawm lub tsev.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-12-2024