1. Txheej txheem cej luam
Hydroxypropyl Methylcellulose (HPMC) yog cov khoom siv molecular siab nrog kev ua haujlwm zoo, uas yog siv dav hauv cov khoom siv hauv tsev, tshwj xeeb tshaj yog hauv kev tsim cov cement-based mortar. Lub luag haujlwm tseem ceeb ntawm HPMC hauv cov cement mortar muaj xws li thickening, dej tuav, txhim kho cov khoom sib txuas thiab txhim kho kev ua haujlwm. Kev nkag siab txog tus cwj pwm dispersion ntawm HPMC hauv cov cement mortar yog qhov tseem ceeb heev rau kev ua kom nws ua tau zoo.
2. Cov khoom tseem ceeb ntawm HPMC
HPMC yog ib qho uas tsis yog-ionic cellulose ether, uas nws cov chav nyob yog tsim los ntawm cellulose, hydroxypropyl thiab methyl. Cov qauv tshuaj ntawm HPMC muab nws lub cev thiab tshuaj lom neeg tshwj xeeb hauv cov tshuaj aqueous:
Cov nyhuv Thickening: HPMC tuaj yeem tsim cov kua dej khov rau hauv dej, uas yog vim qhov tseeb tias tom qab nws yaj hauv dej, cov molecules tau entangled nrog ib leeg los tsim cov qauv network.
Kev tuav dej: HPMC muaj lub peev xwm tuav dej ruaj khov thiab tuaj yeem ncua dej evaporation, yog li ua lub luag haujlwm khaws dej hauv cov cement mortar.
Adhesion kev ua tau zoo: Vim tias HPMC cov molecules tsim cov yeeb yaj kiab tiv thaiv ntawm cov cement, cov kev sib txuas ntawm cov khoom tau zoo tuaj.
3. Cov txheej txheem dispersion ntawm HPMC hauv cov cement mortar
Cov txheej txheem tawg: HPMC yuav tsum tau yaj hauv dej ua ntej. Cov txheej txheem tawg yog tias HPMC hmoov absorbs dej thiab swells, thiab maj mam disperses los tsim ib qho kev daws teeb meem. Txij li thaum lub solubility ntawm HPMC nyob rau hauv dej muaj feem xyuam rau nws cov degree ntawm kev hloov (DS) thiab molecular hnyav, nws yog ib qho tseem ceeb rau xaiv tus HPMC specification. Lub dissolution ntawm HPMC nyob rau hauv dej yog ib tug diffusion txheej txheem, uas yuav tsum tau stirring kom ceev dispersion.
Dispersion uniformity: Thaum lub sij hawm dissolution ntawm HPMC, yog hais tias lub stirring yog tsis txaus los yog cov dissolution tej yam kev mob yog tsis tsim nyog, HPMC yog nquag tsim agglomerates (ntses qhov muag). Cov agglomerates no nyuaj rau yaj ntxiv, yog li cuam tshuam rau kev ua haujlwm ntawm cov cement mortar. Yog li ntawd, kev sib xyaw ua ke thaum lub sij hawm kev sib cais yog qhov txuas tseem ceeb los xyuas kom meej qhov sib txawv ntawm HPMC.
Kev sib cuam tshuam nrog cov cement particles: Cov saw hlau polymer tsim tom qab HPMC yaj yuav maj mam adsorb rau saum npoo ntawm cov cement thiab choj ntawm cov cement hais los tsim cov yeeb yaj kiab tiv thaiv. Cov yeeb yaj kiab tiv thaiv no tuaj yeem ua rau kom muaj qhov adhesion ntawm cov khoom ntawm ib sab, thiab ntawm qhov tod tes, nws tuaj yeem tsim ib qho kev thaiv ntawm cov khoom kom ncua kev tsiv teb tsaws thiab evaporation ntawm dej.
Dispersion stability: Lub polymer saw ntawm HPMC tuaj yeem ua rau lub cev adsorb nrog Ca2 +, SiO2 thiab lwm yam ions nyob rau saum npoo ntawm cov cement particles kom ruaj khov nws lub xeev dispersion. Los ntawm kev kho cov degree ntawm kev hloov thiab molecular hnyav ntawm HPMC, nws dispersion stability nyob rau hauv cement mortar yuav optimized.
4. Kev ua haujlwm zoo ntawm HPMC hauv cov cement mortar
Thickening nyhuv:
Cov nyhuv thickening ntawm HPMC nyob rau hauv mortar nyob ntawm nws cov concentration thiab molecular hnyav. HPMC nrog qhov hnyav dua molecular tuaj yeem ua rau muaj qhov viscosity ntawm cov tshuaj khib nyiab, thaum HPMC nrog qhov hnyav molecular tuaj yeem tsim cov nyhuv thickening zoo dua ntawm qhov tsis tshua muaj siab.
Cov nyhuv thickening tuaj yeem txhim kho kev ua haujlwm ntawm cov mortar thiab ua kom cov mortar muaj kev ua haujlwm zoo dua qub, tshwj xeeb tshaj yog nyob rau hauv kev tsim kho ntsug.
Kev tuav dej:
HPMC tuaj yeem ntes cov dej noo zoo thiab txuas ntxiv lub sijhawm qhib ntawm lub mortar. Kev tuav dej tuaj yeem tsis tsuas yog txo qhov shrinkage thiab cracking teeb meem nyob rau hauv lub mortar, tab sis kuj txhim kho kev sib raug zoo ntawm cov mortar ntawm lub substrate.
Lub peev xwm tuav dej ntawm HPMC yog ze ze rau nws cov solubility. Los ntawm kev xaiv HPMC nrog rau qib tsim nyog ntawm kev hloov pauv, cov dej khaws cia ntawm cov tshuaj khib tuaj yeem ua kom zoo dua.
Txhim kho cov khoom sib txuas:
Txij li thaum HPMC tuaj yeem tsim tus choj nplaum ntawm cov cement hais, nws tuaj yeem txhim kho kev sib raug zoo ntawm mortar, tshwj xeeb tshaj yog thaum siv hauv thermal rwb thaiv tsev mortar thiab pobzeb adhesives.
HPMC tseem tuaj yeem txhim kho kev tsim kho kev ua haujlwm los ntawm kev txo cov evaporation sai ntawm cov dej thiab muab sijhawm ua haujlwm ntev dua.
Kev tsim kho kev ua haujlwm:
Kev thov ntawm HPMC hauv mortar tuaj yeem txhim kho nws txoj kev tsim kho. HPMC ua rau cov mortar muaj lubricity zoo dua thiab viscosity, uas yog ib qho yooj yim rau kev thov thiab tsim, tshwj xeeb tshaj yog nyob rau hauv kev nthuav dav kev ua haujlwm kom ntseeg tau tias kev tsim kho du.
Los ntawm kev kho tus nqi thiab kev teeb tsa ntawm HPMC, cov khoom rheological ntawm mortar tuaj yeem hloov kho kom haum rau kev tsim kho sib txawv.
5. Daim ntawv thov piv txwv ntawm HPMC hauv cov cement mortar
Pobzeb nplaum:
HPMC feem ntau ua lub luag haujlwm ntawm kev tuav dej thiab ua kom tuab hauv cov nplais nplaum. Los ntawm kev txhim kho cov dej tuav ntawm cov nplaum, HPMC tuaj yeem txuas ntxiv nws lub sijhawm qhib, muab lub sijhawm hloov kho kom txaus, thiab tiv thaiv cov vuas los ntawm kev swb tom qab kev tsim kho.
Cov nyhuv thickening xyuas kom meej tias cov nplaum tsis sag thaum lub sij hawm siv facade, txhim kho qhov yooj yim thiab cov nyhuv ntawm kev tsim kho.
Sab nrauv phab ntsa rwb thaiv tsev mortar:
Nyob rau sab nrauv phab ntsa rwb thaiv tsev mortar, lub luag haujlwm tseem ceeb ntawm HPMC yog los txhim kho cov dej tuav thiab tawg tsis kam ntawm mortar. Los ntawm kev ntes cov dej noo, HPMC tuaj yeem txo qhov shrinkage thiab cracking ntawm mortar thaum lub sij hawm ziab.
Txij li cov rwb thaiv tsev mortar muaj cov kev xav tau siab rau kev tsim kho kev ua haujlwm, cov nyhuv thickening ntawm HPMC tuaj yeem ua kom muaj kev sib faib ntawm cov tshuaj khib rau ntawm phab ntsa, yog li txhim kho tag nrho cov kev ua tau zoo ntawm cov rwb thaiv tsev.
Self-leveling mortar:
HPMC nyob rau hauv tus kheej-leveling mortar tuaj yeem ua kom ntseeg tau tias tsis muaj stratification los yog dej seepage thaum lub sij hawm leveling txheej txheem los ntawm kev ua kom cov viscosity ntawm cov mortar, yog li xyuas kom meej lub flatness thiab lub zog ntawm tus kheej-leveling.
6. Kev txhim kho yav tom ntej ntawm HPMC
Ntsuab thiab ib puag ncig tiv thaiv:
Nrog rau kev txhim kho ntawm kev tiv thaiv ib puag ncig, kev txhim kho cov tshuaj lom neeg tsawg thiab biodegradable HPMC cov khoom yuav dhau los ua ib qho kev taw qhia tseem ceeb yav tom ntej.
Ntsuab thiab ib puag ncig tus phooj ywg HPMC tuaj yeem tsis tsuas yog txo qhov cuam tshuam ntawm ib puag ncig, tab sis kuj muab kev nyab xeeb rau kev ua haujlwm thaum lub sijhawm tsim kho.
Kev ua haujlwm siab:
Los ntawm kev txhim kho cov qauv molecular ntawm HPMC, cov khoom ua tau zoo HPMC yog tsim los ua kom tau raws li cov cement mortar daim ntaub ntawv nrog rau kev ua tau zoo dua.
Piv txwv li, los ntawm kev kho cov qib ntawm kev hloov thiab molecular hnyav ntawm HPMC, cov khoom uas muaj viscosity siab dua thiab muaj zog tuav dej yuav tsim.
Intelligent Application:
Nrog rau kev txhim kho ntawm cov ntaub ntawv tshawb fawb, ntse teb HPMC yog siv rau cov cement mortar, ua kom nws kho nws tus kheej kev ua tau zoo raws li ib puag ncig kev hloov pauv, xws li hloov kho cov dej tuav hauv cov av sib txawv.
High-zoo cellulose HPMC tuaj yeem cuam tshuam zoo thiab muab cov thickening, dej tuav thiab txhim kho kev tsim kho hauv cov cement mortar los ntawm nws cov qauv tshuaj tshwj xeeb thiab lub cev. Los ntawm kev xaiv thiab ua kom zoo dua ntawm kev siv HPMC, tag nrho cov kev ua tau zoo ntawm cov cement mortar tuaj yeem txhim kho kom tau raws li qhov xav tau ntawm cov ntawv thov sib txawv. Nyob rau hauv lub neej yav tom ntej, lub ntsuab, kev ua tau zoo thiab kev txawj ntse ntawm HPMC yuav txhawb ntxiv nws daim ntawv thov thiab kev loj hlob ntawm cov ntaub ntawv hauv tsev.
Post lub sij hawm: Jun-21-2024