Lub sijhawm teeb tsa yog ib qho tseem ceeb uas cuam tshuam rau kev ua haujlwm zoo thiab nce qib. Yog tias lub sijhawm teem sijhawm ntev heev, nws yuav ua rau kev tsim kho qeeb qeeb thiab ua kom lub zog ua kom tawv tawv zoo; Yog tias lub sijhawm teem sijhawm luv heev, nws yuav ua rau muaj kev nyuaj rau kev tsim kho thiab cuam tshuam rau kev tsim kho ntawm qhov project. Txhawm rau kho lub sijhawm ua haujlwm ntawm cov pob zeb ua, kev siv infixtures tau dhau los ua ib qho qauv hauv kev tsim khoom niaj hnub hauv niaj hnub.Hydroxyethyl Methyl Cellulose (HEMC), raws li ib qho kev hloov kho cellulose ib txwm muaj, yog siv dav hauv cov qhob admixtures thiab tuaj yeem ua kom muaj kev ntseeg, kev ua kom lub sijhawm thiab lwm yam khoom ntawm cov pob zeb.1. Cov khoom yooj yim ntawm HEMC
HEMC yog cov cellulose hloov, feem ntau yog tsim los ntawm cov xov tooj ntawm lub ntsej muag los ntawm kev ua kom muaj kev vam meej thiab methylation. Nws muaj cov dej ua kom zoo, thickening, dej tuav thiab gelling cov zog, yog li nws tau siv dav siv hauv kev tsim kho, tshuaj lom zem txhua hnub thiab lwm thaj teb. Hauv cov pob zeb ua, hemc feem ntau siv los ua cov tuab dua, cov dej tswj tus neeg sawv cev, uas tuaj yeem txhim kho kev ua haujlwm ntawm kev ua vaj tse, nce lub sijhawm ua kom zoo dua qub.
2. Cov nyhuv ntawm HEMC rau lub sijhawm teeb lub sij hawm ntawm cov pob zeb ua
Ncua sijhawm sijhawm
Raws li lub cellulose derivative, hemc muaj ntau pawg ntawm hydrophilic hauv nws cov qauv molecules los ua cov hydecular los ua cov txheej txheem dej khov kho, yog li ncua cov txheej txheem casas rau ib qho. Cov tshuaj tua dej ntawm cov xis yog lub ntsiab mechanism ntawm cov storicification, thiab ntxiv rau HEMC tuaj yeem cuam tshuam lub sijhawm teem sijhawm:
Kev Ua Kom Muaj Dej Kaus Ceev: HemC tuaj yeem txhim kho cov dej khaws cia, thiab ua kom lub sijhawm ua kom muaj zog ntawm cov xis. Los ntawm cov dej khaws cia, hemc tuaj yeem zam dhau qhov dej dhau, yog li ncua kev tshwm sim ntawm kev pib thiab zaum kawg.
Txo cov dej ua kom sov: hemc tuaj yeem inhibit kev sib tsoo thiab hydration tshuaj tiv thaiv kev sib tsoo los ntawm kev nce lub viscosity ntawm pob zeb ua kom ceev ntawm Maas hais. Tus nqi dej qis dua yuav pab ncua lub sijhawm teem caij ua vaj tse.
Rheological hloov kho: hemc tuaj yeem kho cov khoom sib dhos ntawm cov pob zeb ua kom zoo, thiab ua kom cov pob zeb zoo nyob rau hauv thaum ntxov, zam kev tsim txom tshwm sim los ntawm kev ua haujlwm sib txawv.
Zais Cov Lus Qhia
Cov nyhuv ntawmTus tseem ceebNtawm lub sijhawm teeb tsa tsis yog tsuas yog cuam tshuam nrog nws cov tshuaj, tab sis kuj cuam tshuam los ntawm lwm cov xwm txheej sab nraud:
Molecular hnyav thiab qib deg ntawm kev hloov chaw ntawm HEMC: Qhov hnyav thiab qib hloov chaw (cov neeg ua haujlwm ntawm Methyl) ntawm HEMC muaj kev cuam tshuam zoo rau nws qhov kev ua tau zoo. HEMC nrog siab dua molecular hnyav thiab siab dua cov qauv hloov pauv thiab ua kom muaj zog dua qub, yog li kev ncua cov khoom siv lub sijhawm yog qhov tseem ceeb dua.
Hom Maas: sib txawv ntau hom Maas muaj cov nqi hemter sib txawv, yog li cov nyhuv ntawm HEMC ntawm cov hloov pauv hloov pauv sib txawv. Txoj Cai Portland zoo tib yam muaj qhov ua kom muaj dej xis nyob sai dua, thiab cov khoom noj tshwj xeeb uas muaj Hemc hauv cov kab ke no yuav muaj txiaj ntsig ntau dua.
Kev mob ib puag ncig: ib puag ncig cov mob xws li qhov kub thiab vaum muaj qhov tseem ceeb ntawm lub sijhawm ua vaj tse. Cov kev kub ntxhov siab dua yuav nrawm dua cov paasas, ua rau lub sijhawm luv luv, thiab cov txiaj ntsig ntawm hemc hauv qhov chaw kub muaj zog. Ntawm qhov tsis sib xws, hauv qhov chaw kub tsawg, qhov kev ncua kev cuam tshuam ntawm HEMC yuav pom tseeb.
Concentration ntawm HEMC: Cov concentration ntawm handc ncaj qha txiav txim siab cov qib ntawm nws cov cawv ntawm pob zeb. Kev txiav txim siab ntau dua ntawm HEMC tuaj yeem ua kom cov dej ua kom tau zoo thiab ua kom muaj kev ncua zoo, yog li Hemc ntau dhau yuav ua rau muaj kev ua haujlwm tsis zoo thiab cuam tshuam kev ua haujlwm phem.
Synergistic nyhuv ntawm HEMC nrog rau Lwm Admixtures
HEMC feem ntau yog siv nrog lwm admixtures (xws li dej reducers, retarders, thiab lwm yam) kom nkag siab txog kev ua tau zoo ntawm cov pob zeb ua tau zoo. Nrog kev koom tes ntawm Retarders, qhov teeb tsa ncua nyhuv ntawm HEMC yuav ua tau ntxiv. Piv txwv li, cov nyhuv synergistic ntawm qee cov neeg rov qab xws li phosphates thiab qab zib tau txuas ntxiv lub sijhawm ua haujlwm hauv cov huab cua sov lossis xav tau lub sijhawm siv sijhawm ntev.
3. Lwm yam cuam tshuam ntawm HEMC ntawm Cov Khoom Siv Ua Si
Ntxiv rau ncua ncua lub sijhawm teeb tsa, Hemc tseem muaj cov nyhuv tseem ceeb rau lwm yam khoom ntawm cov pob zeb. Piv txwv li, hemc tuaj yeem txhim kho kom muaj kev tawm tsam kom zoo, tiv thaiv kev ua haujlwm, tso twj ua haujlwm thiab cov khoom siv ruaj khov. Thaum kho lub sijhawm teem sijhawm, lub sijhawm tuab thiab dej khaws cia ntawm HEMC kuj tseem tuaj yeem tiv thaiv kev sib cais lossis los ntshav ua kom zoo thiab ruaj khov ntawm pob zeb.
Hydroxyether Metherylulose (HEMC) muaj peev xwm ncua sij hawm lub sij hawm ntawm qhob los ntawm nws cov dej zoo thiab rheological cov kev cai. Cov degree ntawm kev cuam tshuam ntawm HEMC raug cuam tshuam los ntawm qhov kev cuam tshuam xws li nws cov roj molecular, degree hloov, ua kev sib xyaw ua ke thiab ib puag ncig cov xwm txheej. Los ntawm kev tswj hwm cov tshuaj thiab cov feem ntawm cov hemc, lub sijhawm teeb tsa tuaj yeem txuas ntxiv thaum ua kom muaj cov pob zeb ua kom zoo ua ke. Txawm li cas los xij, kev siv Hemc ntau dhau kuj tseem yuav coj cov teebmeem tsis zoo, xws li siv dej tsis zoo, yog li nws yuav tsum tau siv nrog kev ceev faj raws li kev siv cov kev xav tau tiag tiag raws li qhov kev siv tau zoo.
Lub Sijhawm Post: Nov-21-2024