1. Txheej txheem cej luam
Hydroxypropyl Methylcellulose (HPMC) yog ib qho tshuaj muaj zog heev uas muaj kev ua tau zoo heev, uas siv dav hauv cov ntaub ntawv siv hauv kev tsim kho, tshwj xeeb tshaj yog hauv kev tsim cov cement-based mortar. Lub luag haujlwm tseem ceeb ntawm HPMC hauv cement mortar suav nrog kev ua kom tuab, khaws dej, txhim kho cov khoom sib txuas thiab txhim kho kev ua haujlwm. Kev nkag siab txog tus cwj pwm dispersion ntawm HPMC hauv cement mortar yog qhov tseem ceeb heev rau kev ua kom zoo dua nws cov kev ua tau zoo.
2. Cov khoom tseem ceeb ntawm HPMC
HPMC yog cov cellulose ether uas tsis yog ionic, uas nws cov qauv tsim yog tsim los ntawm cellulose, hydroxypropyl thiab methyl. Cov qauv tshuaj ntawm HPMC muab nws cov khoom siv lub cev thiab tshuaj tshwj xeeb hauv cov kua dej:
Cov nyhuv ua kom tuab: HPMC tuaj yeem tsim cov kua nplaum hauv dej, uas yog vim qhov tseeb tias tom qab nws yaj hauv dej, cov molecule tau sib koom ua ke los tsim cov qauv network.
Kev khaws dej: HPMC muaj peev xwm khaws dej tau zoo thiab tuaj yeem ncua kev ua kom dej qhuav, yog li ua lub luag haujlwm hauv kev khaws dej hauv cov cement mortar.
Kev ua tau zoo ntawm kev nplaum: Vim tias HPMC molecules tsim ib zaj duab xis tiv thaiv ntawm cov cement me me, kev ua tau zoo ntawm kev sib txuas ntawm cov khoom me me tau zoo dua.
3. Cov txheej txheem tawg ntawm HPMC hauv cov cement mortar
Cov txheej txheem yaj: HPMC yuav tsum tau yaj rau hauv dej ua ntej. Cov txheej txheem yaj yog tias HPMC hmoov nqus dej thiab o, thiab maj mam tawg ua cov tshuaj sib xws. Txij li thaum qhov yaj ntawm HPMC hauv dej muaj feem cuam tshuam nrog nws qib kev hloov pauv (DS) thiab qhov hnyav molecular, nws yog qhov tseem ceeb heev uas yuav tsum xaiv qhov HPMC specification kom raug. Kev yaj ntawm HPMC hauv dej yog cov txheej txheem diffusion, uas yuav tsum tau do kom zoo kom nrawm dua kev yaj.
Kev sib npaug ntawm kev tawg: Thaum lub sijhawm yaj ntawm HPMC, yog tias qhov kev sib xyaw tsis txaus lossis cov xwm txheej kev yaj tsis tsim nyog, HPMC yuav tsim cov 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 sib npaug thaum lub sijhawm yaj yog qhov txuas tseem ceeb kom ntseeg tau tias muaj kev sib xyaw sib npaug ntawm HPMC.
Kev sib cuam tshuam nrog cov khoom me me ntawm cov cement: Cov saw hlau polymer uas tsim tom qab HPMC yaj yuav maj mam nqus rau ntawm qhov chaw ntawm cov khoom me me ntawm cov cement thiab txuas ntawm cov khoom me me ntawm cov cement los ua ib daim zaj duab xis tiv thaiv. Daim zaj duab xis tiv thaiv no tuaj yeem ua rau kom muaj kev sib txuas ntawm cov khoom me me ntawm ib sab tes, thiab ntawm qhov tod tes, nws tuaj yeem tsim ib qho thaiv rau ntawm qhov chaw ntawm cov khoom me me kom ncua kev tsiv teb tsaws chaw thiab kev ua pa ntawm dej.
Kev ruaj khov ntawm kev tawg: Cov saw polymer ntawm HPMC tuaj yeem nqus tau Ca2 +, SiO2 thiab lwm yam ions ntawm qhov chaw ntawm cov cement kom ruaj khov nws lub xeev tawg. Los ntawm kev kho qhov degree ntawm kev hloov pauv thiab qhov hnyav molecular ntawm HPMC, nws qhov kev ruaj khov ntawm kev tawg hauv cov cement mortar tuaj yeem ua kom zoo dua.
4. Kev ua haujlwm zoo ntawm HPMC hauv cov cement mortar
Cov nyhuv tuab:
Qhov ua kom tuab ntawm HPMC hauv cov tshuaj khib nyob ntawm nws qhov kev sib xyaw thiab qhov hnyav molecular. HPMC nrog qhov hnyav molecular siab dua tuaj yeem ua rau kom cov viscosity ntawm cov tshuaj khib nce ntxiv, thaum HPMC nrog qhov hnyav molecular qis tuaj yeem ua rau muaj qhov tuab zoo dua ntawm qhov sib xyaw qis.
Qhov ua kom tuab tuaj yeem txhim kho qhov ua haujlwm ntawm cov mortar thiab ua rau cov mortar muaj kev ua haujlwm zoo dua, tshwj xeeb tshaj yog hauv kev tsim kho ntsug.
Kev khaws dej:
HPMC tuaj yeem ntes tau cov dej noo thiab ntev lub sijhawm qhib ntawm cov mortar. Kev khaws dej tsis yog tsuas yog txo qhov shrinkage thiab tawg hauv cov mortar, tab sis kuj txhim kho kev ua tau zoo ntawm cov mortar ntawm lub substrate.
Lub peev xwm khaws dej ntawm HPMC muaj feem cuam tshuam nrog nws cov solubility. Los ntawm kev xaiv HPMC nrog qib kev hloov pauv tsim nyog, cov nyhuv khaws dej ntawm cov mortar tuaj yeem ua kom zoo dua.
Cov khoom sib txuas zoo dua:
Vim tias HPMC tuaj yeem tsim tus choj nplaum ntawm cov cement me me, nws tuaj yeem txhim kho lub zog sib txuas ntawm cov mortar, tshwj xeeb tshaj yog thaum siv rau hauv cov thermal insulation mortar thiab cov nplaum pobzeb.
HPMC kuj tseem tuaj yeem txhim kho kev ua haujlwm ntawm kev tsim kho los ntawm kev txo cov dej uas ua kom qhuav sai thiab muab sijhawm ua haujlwm ntev dua.
Kev ua tau zoo ntawm kev tsim kho:
Kev siv HPMC hauv cov mortar tuaj yeem txhim kho nws txoj kev ua haujlwm tsim kho. HPMC ua rau cov mortar muaj lubricity thiab viscosity zoo dua, uas yooj yim rau kev thov thiab tsim kho, tshwj xeeb tshaj yog hauv kev ua haujlwm kom ntxaws kom ntseeg tau tias kev tsim kho du.
Los ntawm kev kho qhov ntau thiab kev teeb tsa ntawm HPMC, cov khoom rheological ntawm mortar tuaj yeem ua kom zoo dua los hloov kho nws rau ntau yam kev xav tau kev tsim kho.
5. Cov piv txwv ntawm daim ntawv thov HPMC hauv cov cement mortar
Cov nplaum rau pobzeb:
HPMC feem ntau ua lub luag haujlwm ntawm kev khaws dej thiab ua kom tuab hauv cov nplaum pobzeb. Los ntawm kev txhim kho qhov khaws dej ntawm cov nplaum, HPMC tuaj yeem ntev nws lub sijhawm qhib, muab lub sijhawm kho kom txaus, thiab tiv thaiv cov pobzeb kom tsis txhob plam tom qab kev tsim kho.
Qhov ua kom tuab ua kom cov nplaum tsis sag thaum lub sijhawm tsim kho lub ntsej muag, txhim kho qhov yooj yim thiab cov txiaj ntsig ntawm kev tsim kho.
Cov tshuaj nplaum rwb thaiv tsev phab ntsa sab nraud:
Hauv cov tshuaj nplaum rwb thaiv tsev sab nraud, lub luag haujlwm tseem ceeb ntawm HPMC yog los txhim kho kev khaws dej thiab kev tawg ntawm cov tshuaj nplaum. Los ntawm kev ntes cov dej noo, HPMC tuaj yeem txo qhov ntsws thiab tawg ntawm cov tshuaj nplaum thaum lub sijhawm ziab.
Vim tias cov tshuaj pleev thaiv hnub muaj qhov xav tau siab rau kev ua haujlwm ntawm kev tsim kho, qhov cuam tshuam ntawm HPMC tuaj yeem ua kom muaj kev faib tawm ntawm cov tshuaj pleev thaiv hnub ntawm phab ntsa, yog li txhim kho kev ua tau zoo ntawm cov txheej rwb thaiv tsev.
Cov tshuaj nplaum uas siv tau rau tus kheej:
HPMC hauv cov tshuaj khib nyiab uas nws tus kheej ua tau kom ntseeg tau tias tsis muaj kev sib cais lossis dej ntws thaum lub sijhawm ua kom sib npaug los ntawm kev nce qhov viscosity ntawm cov tshuaj khib nyiab, yog li ua kom muaj qhov tiaj tus thiab lub zog ntawm kev ua kom sib npaug.
6. Kev loj hlob yav tom ntej ntawm HPMC
Kev tiv thaiv ntsuab thiab ib puag ncig:
Nrog kev txhim kho ntawm cov kev cai tiv thaiv ib puag ncig, kev tsim cov khoom lag luam HPMC uas tsis muaj tshuaj lom thiab biodegradable yuav dhau los ua ib qho kev taw qhia tseem ceeb yav tom ntej.
HPMC ntsuab thiab zoo rau ib puag ncig tsis tsuas yog txo qhov cuam tshuam rau ib puag ncig xwb, tab sis kuj muab ib puag ncig ua haujlwm muaj kev nyab xeeb dua thaum lub sijhawm tsim kho.
Kev ua tau zoo siab:
Los ntawm kev ua kom zoo dua cov qauv molecular ntawm HPMC, cov khoom lag luam HPMC ua tau zoo tau tsim los ua kom tau raws li cov ntawv thov cement mortar nrog cov kev xav tau kev ua tau zoo dua.
Piv txwv li, los ntawm kev kho qhov degree ntawm kev hloov pauv thiab qhov hnyav molecular ntawm HPMC, cov khoom uas muaj viscosity siab dua thiab muaj zog dua tuaj yeem tsim tau.
Daim ntawv thov ntse:
Nrog rau kev txhim kho ntawm cov ntaub ntawv tshawb fawb, HPMC ntse teb tau siv rau cov cement mortar, ua rau nws hloov kho nws tus kheej kev ua tau zoo raws li kev hloov pauv ib puag ncig, xws li kho qhov khaws cia dej hauv qab cov av noo sib txawv.
Cov cellulose zoo HPMC tuaj yeem ua kom tawg tau zoo thiab muab cov tuab, khaws dej thiab txhim kho kev ua haujlwm hauv cov cement mortar los ntawm nws cov qauv tshuaj lom neeg thiab cov khoom siv lub cev. Los ntawm kev xaiv thiab ua kom zoo dua ntawm kev siv HPMC, kev ua haujlwm tag nrho ntawm cov cement mortar tuaj yeem txhim kho kom tau raws li qhov xav tau ntawm ntau yam kev siv. Yav tom ntej, kev txhim kho ntsuab, kev ua haujlwm siab thiab ntse ntawm HPMC yuav txhawb nqa nws daim ntawv thov thiab kev txhim kho hauv cov ntaub ntawv tsim kho.
Lub sijhawm tshaj tawm: Lub Rau Hli-21-2024