HydroxyPropyyl methylcellulose (HPMC) Puas yog lub ntuj polymer compace compouse siv nyob rau hauv kev tsim kho, tshuaj, khoom noj thiab lwm daim teb. Nyob rau hauv txoj kev lag luam xis mas txhawj txog ntau ntxiv los txhim kho kev ua tau zoo ntawm cov cement, thiab txhim kho cov kev ua haujlwm ntawm cov xis, kev ua haujlwm thiab qhov kawg ntawm kev sib xyaw ua ke.
1. Cov yam ntxwv yooj yim thiab kev siv tshuab ntawm kev ua ntawm HPMC
HPMC yog tshuaj lom neeg tau txais los ntawm kev hloov cellulose cellulose los ntawm kev ua, hydroxyprropation thiab methylation. Nws cov qauv molecular muaj ntau pab pawg hydrophilic thiab hydrophobic pab pawg, uas ua rau nws ua si ntau lub luag haujlwm hauv cov cavent. HPMC ua si txoj haujlwm hauv qab no hauv Maas:
Thickening nyhuv
HPMC muaj cov nyhuv tuab tuab thiab kho tau cov tshuaj viscosity ntawm kev sib xyaw kom xis nyob thaum sib xyaw thiab tsis txhob stratification lossis sedimentation. Qhov no yog qhov tseem ceeb rau kev txhim kho fluidity thiab ruaj khov ntawm cov xis ua vaj tse los yog lwm yam kev xav tau cov khoom noj kom zoo dua li cov pwm zoo dua thiab muaj qhov nteg ntom dua.
Txhim Kho Cov Khoom Siv Dej
HPMC tuaj yeem tswj cov pa evapively ntawm cov dej hauv cov muab tshuaj txhuam cement thiab ncua sijhawm pib ua lub sijhawm xis mas. Tshwj xeeb tshaj yog nyob rau hauv cov kub thiab qhuav ib puag ncig, nws tuaj yeem ua kom lub siab tawv ntawm cov cement muab ziab thiab tiv thaiv kom qhuav, yog li txhim kho kev tsim kho kev tsim kho kev tsim kho kev tsim kho kev tsim kho kev tsim kho. Dej khaws cia yog ib qho khoom tseem ceeb hauv cov txheej txheem kev tsim kho ntawm cov ntaub ntawv tso ciali yog tuaj yeem ua kom tiv thaiv kom tiv thaiv kev sib nraus.
Txhim kho cov nplaum thiab txhim kho fluh
Lwm yam tshuaj sib xyaw ua ke feem ntau ntxiv rau cov cement paste, xws li admixtures, thiab lwm yam, uas yuav cuam tshuam txog cov kua txiv ntawm cov cement muab tshuaj txhuam. HPMC tuaj yeem ua rau lub zog ua kom muaj zog ntawm cov cement, ua rau slurry ntau yas thiab kua, yog li txhim kho kev tsim kho kev tsim kho kev tsim kho kev tsim kho. Tsis tas li ntawd, HPMC tseem tuaj yeem txhim kho cov nplaum ntawm cov cement thiab lwm cov ntaub ntawv hauv tsev (xws li xuab zeb thiab pob zeb thiab txo qhov tshwm sim ntawm cais.
Txhim Kho Cov Khaub Ncaws Kuj Kuj
Txij li thaum muaj kev ntxhov siab ® Tshwj xeeb tshaj yog nyob rau hauv thaum ntxov theem thaum lub sij hawm ntxov thaum lub sij hawm ua kom lub zog hloov tsis tau mus txog rau theem txaus, cov khoom siv xis yog xav tau cov kab nrib pleb. Los ntawm kev siv HPMC, tus nqi qis dua ntawm cov xis mas tuaj yeem tau qeeb thiab ua kom nrawm tshwm sim los ntawm cov dej sai tau txo qis.
2. Cov nyhuv ntawm HPMC hauv Maas Daim Ntawv Thov
Txhim Kho Lub Neej Kev Ua Haujlwm Maas
Cov nyhuv tuab ntawm HPMC ua rau cov cement muab ntau dua. Rau ntau hom xis mas (xws li cov cai Portland xis mas, thiab lwm yam. Tsis tas li ntawd, HPMC tuaj yeem ua cov cement muab ntau dua thaum kev tsim kho, txo cov huab cua ua kom zoo, thiab txhim kho cov kev tsim kho cua zoo.
Txhim kho Maas zog
Qhov kev sib txuas ntawm HPMC tuaj yeem txhim kho lub zog ua tau zoo ntawm cov cement rau qee yam. Nws hloov cov ntawv faib tawm hauv cov cement, txhawb nqa kev sib xyaw ntawm cov pajasas ua rau lub zog kawg ntawm cov cement. Hauv kev siv cov kev siv, ntxiv tus nqi ntawm HPMC tsim nyog txhawb nqa kev ua haujlwm ntawm dej xis thiab txhim kho lub compressive, flexural thiab tensile lub zog ntawm xis mas.
Txhim kho qhov ruaj khov
Qhov sib ntxiv ntawm HPMC pab txhawm rau txhim kho lub durability ntawm xis mas. Tshwj xeeb tshaj yog thaum MAAs raug rau kev ua kom haum rau cov pa hluav taws xob thiab cov pa roj av, thiab lwm yam) kev ua haujlwm ntawm cov qauv xis mas. Tsis tas li ntawd, HPMC tuaj yeem txo qhov hws hws ntawm cov xis ntxhees thiab ua kom muaj kev sib xyaw ntawm cov cement, yog li txo nws qhov chaw tsis zoo nyob hauv ib puag ncig hnyav.
Txhim kho ib puag ncig kev hloov kho ib puag ncig
Nyob rau hauv huab cua huab cua huab cua, kev ua yeeb yam ntawm cov xis mas feem ntau cuam tshuam los ntawm kev hloov pauv kub thiab av noo. HPMC tuaj yeem ncua lub sijhawm teeb tsa lub sij hawm ntawm Maas slurry thiab txo cov teeb meem tshwm sim los ntawm kev ziab nrawm los yog kev siv dej ntau dhau. Yog li ntawd, nws yog qhov tshwj xeeb rau kev tsim kho ib puag ncig nrog kub siab, tsis tshua sov thiab cov av noo hloov.
3. Kev siv siab ntawm HPMC
Txawm hais tias daim ntawv thov ntawm HPMC hauv kev hloov pauv tau txhim kho nws cov kev ua tau zoo, nws yuav tsum tau ceev faj, tshwj xeeb tshaj yog nyob rau hauv tus nqi ntxiv. Ntau dhau ntawm HPMC tuaj yeem ua rau cov viscosity ntawm cov cement muab ntau dua, ua rau sib xyaw tsis sib xws lossis ua haujlwm tsis sib haum. Feem ntau, tus nqi HPMC ntxiv yuav tsum tau tswj hwm ntawm 0.1% thiab 0.5% ntawm cov cement hom hom, thov siv thiab chaw tsim kho.
Cov chaw sib txawv, cov lus qhia tshwj xeeb thiab kev hloov kho qib ntawmHPMC Kuj tseem yuav muaj kev cuam tshuam sib txawv ntawm cov khoom noj qabent. Yog li ntawd, thaum xaiv HPMC, cov ntsiab lus xws li kev hnyav molecular, hydroxypropyl thiab methylation degree yuav tsum tau txiav txim siab kom tau txais kev hloov kho zoo tshaj plaws. Cov nyhuv.
Raws li kev hloov kho MAAs tseem ceeb, txhawj xeeb txog kev ua haujlwm, txhim kho kev hloov kho, txhim kho cov dej ua haujlwm, txhim kho cov dej nplaum thiab tawg. Nws cov ntawv thov thoob plaws hauv kev lag luam Maas tsis yog txhim kho kev tshawb fawb tag nrho ntawm cov kev tshawb fawb thiab cov khoom siv ua kom zoo thiab ib puag ncig cov ntaub ntawv hauv tsev. Raws li kev tsim kho cov haujlwm txuas ntxiv mus ntxiv rau lawv cov kev xav tau rau cov khoom ua tau zoo, HPMC muaj kev lag luam loj hlob ntxiv.
Lub Sijhawm Post: Jan-16-2025