Hydroxyethyl methylcellulose (HEMC), ua ib qho tshuaj polymer uas feem ntau yaj hauv dej, muaj qhov zoo heev hauv cov txheej cement. Nws cov qauv tshuaj lom neeg tso cai rau nws ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua tau zoo ntawm cov txheej cement.
1. Txhim kho kev ua haujlwm ntawm kev tsim kho
Thaum lub sijhawm tsim cov txheej txheem cement-based coatings, fluidity thiab workability yog cov yam tseem ceeb uas cuam tshuam rau qhov zoo ntawm cov txheej txheem thiab kev tsim kho kom zoo. HEMC tuaj yeem txhim kho kev ua tau zoo ntawm cov txheej txheem los ntawm kev nce qhov viscosity thiab dej khaws cia ntawm cov txheej txheem. Qhov kev ua tau zoo tshwj xeeb yog:
Txhim kho kev ua haujlwm ntawm cov xim: HEMC tuaj yeem ua rau kom cov xim sib xws, ua rau nws yooj yim dua los tswj cov xim thaum lub sijhawm txheej txheem thiab zam cov teeb meem xws li cov xim ntws thiab ntws.
Txhim kho qhov kev khaws cia dej ntawm cov txheej txheej: HEMC tuaj yeem txhim kho qhov kev khaws cia dej ntawm cov txheej txheej cement, qeeb qeeb qhov kev ua kom dej evaporation, thiab xyuas kom meej tias qhov sib xws thiab ruaj khov ntawm cov txheej txheej.
Qhov no yog qhov tshwj xeeb tshaj yog rau cov xwm txheej kev tsim kho uas xav tau kev ua haujlwm ntev. Nws tuaj yeem ua kom cov cement slurry tsis qhuav ua ntej lub sijhawm tsim cov txheej txheem, yog li ua kom ntseeg tau tias qhov zoo ntawm cov txheej txheem.
2. Txuas sijhawm qhib
Lub sijhawm qhib ntawm cov xim pleev cement yog lub sijhawm tom qab cov xim tau siv lawm uas nws tseem tuaj yeem kho lossis ua tiav. Ua ib qho khoom ua kom tuab zoo, HEMC tuaj yeem ncua lub sijhawm qhib ntawm cov xim pleev cement, yog li ua rau kev tsim kho yooj yim dua. Tom qab ntxiv HEMC rau cov xim pleev cement, cov neeg ua haujlwm tsim kho tuaj yeem muaj sijhawm ntau dua los kho cov xim pleev thiab txiav kom tsis txhob muaj teeb meem tshwm sim los ntawm kev kho sai ntawm cov xim pleev.
3. Txhim kho qhov nplaum ntawm cov xim
HEMC tuaj yeem txhim kho qhov kev sib txuas ntawm cov txheej thiab cov substrate hauv cov cement-based coatings, tshwj xeeb tshaj yog rau ntawm cov nto du lossis nyuaj-rau-sib txuas substrate (xws li hlau, iav, thiab lwm yam). Kev ntxiv ntawm HEMC tuaj yeem txhim kho qhov kev sib txuas ntawm cov txheej. Ua kom pom tseeb. Ua li no, tsis yog tsuas yog lub zog ntawm cov txheej tau txhim kho, tab sis kuj tseem muaj peev xwm tiv thaiv kev poob ntawm cov txheej tau txhim kho.
4. Txhim kho qhov tawg tsis kam ntawm cov txheej txheem
Cov txheej txheem cement-based feem ntau yuav tawg thaum lub sijhawm kho, tshwj xeeb tshaj yog nyob rau hauv cov txheej txheem tuab lossis nyob rau hauv qhov kub siab. HEMC tuaj yeem txhim kho qhov elasticity ntawm cov txheej txheem los ntawm nws cov qauv molecular tshwj xeeb, txo qhov ntim shrinkage los ntawm dej volatilization, thiab txo qhov tshwm sim ntawm cov kab nrib pleb. HEMC kuj tseem tuaj yeem cuam tshuam nrog lwm cov khoom hauv cement los tsim cov qauv network ruaj khov dua, ntxiv txhim kho qhov tawv thiab tawg tsis kam ntawm cov txheej txheem.
5. Txhim kho qhov dej tsis kam ntawm cov coatings
Qhov kev tiv thaiv dej ntawm cov txheej cement-based yog qhov tseem ceeb rau kev tsim kho sab nraud, qab nthab, thiab lwm qhov chaw uas raug dej noo lossis dej. Cov yam ntxwv ntawm HEMC uas khaws dej tuaj yeem ua rau qeeb qeeb ntawm kev poob dej hauv cov txheej cement-based, yog li txhim kho qhov kev tiv thaiv dej ntawm cov txheej. Tsis tas li ntawd, HEMC tuaj yeem sib koom ua ke nrog cov khoom xyaw hauv cement los txhim kho qhov muaj peev xwm tiv thaiv kev nkag mus ntawm cov txheej, yog li txhim kho kev ua haujlwm tiv thaiv dej ntawm cov txheej.
6. Txhim kho qhov rheology ntawm coatings
Daim ntawv thov ntawm HEMC hauv cov txheej txheem cement-based tuaj yeem txhim kho qhov rheology ntawm cov txheej, muab nws cov kua dej zoo dua thiab cov khoom sib npaug. Tom qab ntxiv HEMC rau cov txheej txheem cement-based, qhov kua dej ntawm cov txheej thaum lub sijhawm txheej txheem tau zoo tshaj plaws, thiab qhov chaw txheej tuaj yeem tsim cov txheej du thiab sib xws dua, zam cov qhov tsis zoo ntawm cov txheej uas tshwm sim los ntawm cov viscosity ntau dhau lossis tsis sib xws.
7. Kev ua tau zoo ntawm ib puag ncig
Raws li ib qho natural polysaccharide derivative,HEMC muaj kev puas tsuaj zoo rau ib puag ncig thiab yog li ntawd muaj kev ua tau zoo heev rau ib puag ncig. Nws tuaj yeem hloov qee cov tshuaj ntxiv thiab txo cov tshuaj lom neeg hauv cov txheej txheej, yog li txhim kho kev ua tau zoo ntawm ib puag ncig ntawm cov txheej txheem cement. Rau cov txheej txheem niaj hnub, kev tiv thaiv ib puag ncig tau dhau los ua qhov tseem ceeb ntawm kev ua lag luam thiab cov cai, yog li kev siv HEMC ua lub luag haujlwm zoo hauv kev txhim kho kev tiv thaiv ib puag ncig ntawm cov txheej txheem.
8. Txhim kho qhov ruaj khov ntawm cov xim
Qhov ntxiv ntawm HEMC tuaj yeem txhim kho qhov kev tiv thaiv kev hnav, kev tiv thaiv huab cua thiab kev tiv thaiv UV ntawm cov txheej cement. Nws tuaj yeem qeeb cov teeb meem xws li kev ploj thiab tawg ntawm cov txheej cement uas tshwm sim los ntawm cov yam ntxwv sab nraud xws li lub hnub ci thiab nag los nag, thiab txhim kho qhov ruaj khov ntawm cov txheej. Qhov zoo no yog qhov tshwj xeeb tshaj yog rau kev tsim cov txheej phab ntsa sab nraud uas raug rau ib puag ncig sab nraud ntev thiab tuaj yeem txuas ntxiv lub neej kev pabcuam ntawm cov txheej.
9. Txhim kho cov tshuaj tua kab mob ntawm cov tshuaj pleev xim cement
Raws li kev noj qab haus huv thiab kev nyab xeeb rau cov ntaub ntawv tsim kho txuas ntxiv mus, cov khoom tiv thaiv kab mob hauv cov txheej txheej tau dhau los ua qhov tseem ceeb. HEMC nws tus kheej muaj qee yam khoom tiv thaiv kab mob thiab tuaj yeem tiv thaiv kev loj hlob ntawm pwm thiab cov kab mob ntawm qhov chaw txheej. Hauv ib puag ncig uas muaj av noo siab, ntxiv HEMC tuaj yeem pab cov txheej txheej tiv thaiv kev yaig ntawm pwm thiab cov kab mob fungi thiab txhim kho kev huv thiab kev ruaj khov ntawm cov txheej txheej.
10. Txhim kho kev nyab xeeb ntawm kev tsim kho ntawm cov xim pleev xim cement
Ua ib yam tshuaj uas tsis muaj tshuaj lom thiab tsis ua rau khaus, HEMC muaj kev nyab xeeb siab. Thaum lub sijhawm tsim kho,HEMCtsis muaj teeb meem rau tib neeg lub cev thiab txo qhov cuam tshuam rau kev noj qab haus huv ntawm cov neeg ua haujlwm tsim kho. Tsis tas li ntawd, HEMC kuj tseem tuaj yeem txo cov hmoov av uas tsim tawm thaum lub sijhawm tsim kho, yog li ua kom huab cua zoo dua qub.
Daim ntawv thov ntawmhydroxyethyl methylcelluloseHauv cov txheej cement-based muaj ntau yam zoo. Nws tsis yog tsuas yog txhim kho kev ua tau zoo ntawm cov txheej, ntev lub sijhawm qhib, thiab txhim kho qhov lo, tab sis kuj txhim kho qhov tawg tsis kam, dej tsis kam, rheology thiab durability ntawm cov txheej. Tsis tas li ntawd, HEMC, ua ib qho khoom siv zoo rau ib puag ncig thiab tsis muaj tshuaj lom, tsis tsuas yog txhim kho kev ua tau zoo ntawm cov txheej, tab sis kuj pab txo qhov hnyav ntawm ib puag ncig. Yog li ntawd, HEMC tau siv dav hauv cov txheej cement-based niaj hnub thiab tau dhau los ua ib qho tseem ceeb hauv kev txhim kho qhov zoo ntawm cov txheej thiab kev ua haujlwm ntawm kev tsim kho.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-11-2024