Lub sijhawm teeb tsa ntawm cov pob zeb ua vaj tse yog ib qho tseem ceeb uas cuam tshuam rau qhov zoo thiab kev nce qib ntawm kev tsim kho. Yog tias lub sijhawm teeb tsa ntev dhau, nws yuav ua rau kev tsim kho qeeb thiab ua rau qhov zoo ntawm cov pob zeb ua vaj tse puas tsuaj; yog tias lub sijhawm teeb tsa luv dhau, nws yuav ua rau muaj teeb meem hauv kev tsim kho pob zeb ua vaj tse thiab cuam tshuam rau qhov cuam tshuam ntawm kev tsim kho ntawm qhov project. Txhawm rau kho lub sijhawm teeb tsa ntawm cov pob zeb ua vaj tse, kev siv cov tshuaj sib xyaw tau dhau los ua ib txoj hauv kev siv ntau hauv kev tsim cov pob zeb ua vaj tse niaj hnub no.Hydroxyethyl Methyl Cellulose (HEMC), ua ib qho cellulose derivative uas tau hloov kho ntau, yog siv dav hauv cov khoom sib xyaw ua ke thiab tuaj yeem cuam tshuam rau rheology, dej khaws cia, teeb tsa lub sijhawm thiab lwm yam khoom ntawm cov pob zeb.1. Cov khoom tseem ceeb ntawm HEMC
HEMC yog ib qho cellulose hloov kho, feem ntau yog ua los ntawm cov cellulose ntuj los ntawm kev sib xyaw ua ke ntawm ethylation thiab methylation. Nws muaj cov dej zoo solubility, thickening, dej khaws cia thiab gelling zog, yog li nws yog dav siv hauv kev tsim kho, coatings, tshuaj txhua hnub thiab lwm yam teb. Hauv cov pob zeb ua vaj tse, HEMC feem ntau yog siv ua thickener, dej khaws cia tus neeg sawv cev thiab rheology tswj tus neeg sawv cev, uas tuaj yeem txhim kho kev ua haujlwm ntawm cov pob zeb ua vaj tse, ua kom lo rau thiab ntev lub sijhawm teeb tsa.
2. Cov nyhuv ntawm HEMC rau lub sijhawm teeb tsa ntawm cov pob zeb ua vaj tse
Ncua lub sijhawm teeb tsa
Ua ib qho cellulose derivative, HEMC muaj ntau pawg hydrophilic hauv nws cov qauv molecular, uas tuaj yeem cuam tshuam nrog cov dej molecules los tsim cov hydrates ruaj khov, yog li ncua cov txheej txheem cement hydration rau qee qhov. Cov tshuaj tiv thaiv hydration ntawm cement yog lub hauv paus tseem ceeb ntawm kev ua kom cov pob zeb khov, thiab kev ntxiv HEMC tuaj yeem cuam tshuam rau lub sijhawm teeb tsa los ntawm cov hauv qab no:
Kev khaws dej kom zoo dua: HEMC tuaj yeem txhim kho qhov khaws dej ntawm cov pob zeb ua vaj tse, qeeb qeeb qhov dej evaporation, thiab ntev lub sijhawm ntawm cov tshuaj tiv thaiv cement hydration. Los ntawm kev khaws dej, HEMC tuaj yeem zam kev poob dej ntau dhau, yog li ncua qhov tshwm sim ntawm thawj zaug thiab zaum kawg.
Txo qhov kub ntawm cov dej noo: HEMC tej zaum yuav tiv thaiv kev sib tsoo thiab kev sib xyaw ntawm cov cement los ntawm kev ua kom cov viscosity ntawm cov pob zeb ua vaj tse nce ntxiv thiab txo qhov ceev ntawm cov cement. Qhov ceev ntawm cov dej noo qis dua pab ncua lub sijhawm teeb tsa ntawm cov pob zeb.
Kev kho kom zoo ntawm cov pob zeb: HEMC tuaj yeem kho cov khoom rheological ntawm cov pob zeb, ua rau nws cov viscosity nce ntxiv, thiab ua kom cov pob zeb ua kom zoo nyob rau theem thaum ntxov, zam kev nyuaj rau kev tsim kho los ntawm kev coagulation ntau dhau.
Cov yam cuam tshuam
Cov nyhuv ntawmHEMCLub sijhawm teem tsis yog tsuas yog muaj feem cuam tshuam nrog nws cov tshuaj xwb, tab sis kuj cuam tshuam los ntawm lwm yam sab nraud:
Qhov hnyav molecular thiab qib kev hloov pauv ntawm HEMC: Qhov hnyav molecular thiab qib kev hloov pauv (qib kev hloov pauv ntawm ethyl thiab methyl) ntawm HEMC muaj kev cuam tshuam loj rau nws qhov kev ua tau zoo. HEMC nrog qhov hnyav molecular siab dua thiab qib kev hloov pauv siab dua feem ntau tuaj yeem tsim cov qauv network muaj zog dua, qhia txog kev khaws dej zoo dua thiab cov khoom tuab, yog li qhov cuam tshuam qeeb rau lub sijhawm teeb tsa tseem ceeb dua.
Hom cement: Cov cement sib txawv muaj cov dej sib txawv, yog li cov nyhuv ntawm HEMC rau cov kab ke cement sib txawv kuj txawv. Cov cement Portland ib txwm muaj cov dej sai dua, thaum qee cov cement qis-kub lossis cov cement tshwj xeeb muaj cov dej qeeb dua, thiab lub luag haujlwm ntawm HEMC hauv cov kab ke no yuav pom tseeb dua.
Tej yam ib puag ncig: Tej yam ib puag ncig xws li kub thiab av noo muaj feem cuam tshuam tseem ceeb rau lub sijhawm teeb tsa ntawm cov pob zeb. Qhov kub siab dua yuav ua rau cov tshuaj tiv thaiv dej ntawm cov cement sai dua, ua rau lub sijhawm teeb tsa luv dua, thiab cov nyhuv ntawm HEMC hauv qhov chaw kub siab yuav tsis muaj zog. Ntawm qhov tsis sib xws, hauv qhov chaw kub qis, cov nyhuv qeeb ntawm HEMC yuav pom tseeb dua.
Kev Ntsuas ntawm HEMC: Qhov kev ntsuas ntawm HEMC ncaj qha txiav txim siab qhov degree ntawm nws cov kev cuam tshuam rau cov pob zeb. Cov kev ntsuas siab dua ntawm HEMC tuaj yeem ua rau cov dej khaws cia thiab rheology ntawm cov pob zeb ntau ntxiv, yog li ua rau lub sijhawm teeb tsa qeeb, tab sis HEMC ntau dhau tuaj yeem ua rau cov pob zeb tsis zoo thiab cuam tshuam rau kev ua haujlwm ntawm kev tsim kho.
Cov nyhuv synergistic ntawm HEMC nrog lwm cov admixtures
HEMC feem ntau siv nrog lwm cov tshuaj sib xyaw (xws li cov tshuaj txo dej, cov tshuaj tiv thaiv, thiab lwm yam) los kho kom zoo dua qhov kev ua tau zoo ntawm cov pob zeb ua vaj tse. Nrog kev koom tes ntawm cov tshuaj tiv thaiv, qhov cuam tshuam ntawm kev teeb tsa qeeb ntawm HEMC yuav raug txhim kho ntxiv. Piv txwv li, qhov cuam tshuam ntawm qee cov tshuaj tiv thaiv xws li phosphates thiab cov tshuaj sib xyaw qab zib nrog HEMC tuaj yeem ncua lub sijhawm teeb tsa ntawm cov pob zeb ua vaj tse, uas yog qhov tsim nyog rau cov haujlwm tshwj xeeb hauv huab cua kub lossis xav tau lub sijhawm tsim kho ntev.
3. Lwm yam teebmeem ntawm HEMC rau cov khoom siv pob zeb
Ntxiv rau qhov ncua lub sijhawm teeb tsa, HEMC kuj tseem muaj qhov cuam tshuam tseem ceeb rau lwm yam khoom ntawm cov pob zeb. Piv txwv li, HEMC tuaj yeem txhim kho qhov fluidity, tiv thaiv kev sib cais, kev ua haujlwm twj thiab kev ruaj khov ntawm cov pob zeb. Thaum kho lub sijhawm teeb tsa, cov thickening thiab cov dej khaws cia ntawm HEMC kuj tseem tuaj yeem tiv thaiv kev sib cais lossis kev los ntshav ntawm cov pob zeb, thiab txhim kho qhov zoo thiab kev ruaj khov ntawm cov pob zeb.
Hydroxyethyl methylcellulose (HEMC) tuaj yeem ncua lub sijhawm teeb tsa ntawm cov pob zeb los ntawm nws cov dej zoo khaws cia, thickening thiab rheological tswj cov teebmeem. Qib ntawm kev cuam tshuam ntawm HEMC yog cuam tshuam los ntawm cov yam xws li nws qhov hnyav molecular, qib ntawm kev hloov pauv, hom cement, kev sib xyaw ua ke thiab cov xwm txheej ib puag ncig. Los ntawm kev tswj hwm qhov ntau thiab tsawg thiab feem pua ntawm HEMC, lub sijhawm teeb tsa tuaj yeem ntev dua thaum ua kom ntseeg tau tias kev ua haujlwm ntawm cov pob zeb, thiab kev ua haujlwm thiab kev ua haujlwm ntev ntawm cov pob zeb tuaj yeem txhim kho. Txawm li cas los xij, kev siv HEMC ntau dhau kuj tseem tuaj yeem coj cov teebmeem tsis zoo, xws li cov kua dej tsis zoo lossis cov dej tsis txaus, yog li nws yuav tsum tau siv nrog kev ceev faj raws li qhov xav tau tiag tiag engineering.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-21-2024