Hydroxypropyl methylcellulose, hu ua: HPMC lossis MHPC. Nws cov tsos yog dawb los yog dawb-dawb hmoov; qhov siv tseem ceeb yog ua tus dispersant hauv kev tsim cov polyvinyl chloride, thiab nws yog tus neeg sawv cev tseem ceeb rau kev npaj PVC los ntawm kev ncua polymerization. Hauv cov txheej txheem kev tsim kho ntawm kev lag luam kev tsim kho, nws feem ntau yog siv rau hauv kev tsim kho tshuab xws li kev tsim phab ntsa, plastering, caulking, thiab lwm yam; tshwj xeeb tshaj yog hauv kev tsim kho kom zoo nkauj, nws yog siv los nplaum cov vuas ceramic, marble, thiab cov khoom dai yas. Nws muaj lub zog sib txuas siab thiab tuaj yeem txo qhov ntau ntawm cov cement. Nws yog siv los ua cov khoom tuab hauv kev lag luam xim, uas tuaj yeem ua rau txheej ci thiab mos, tiv thaiv kev tshem tawm hmoov, txhim kho kev ua tau zoo ntawm qib, thiab lwm yam.
Hauv cov cement mortar thiab gypsum-based slurry, hydroxypropyl methylcellulose feem ntau ua lub luag haujlwm ntawm kev khaws cia dej thiab thickening, uas tuaj yeem txhim kho lub zog sib koom ua ke thiab sag tsis kam ntawm slurry.
Tej yam xws li qhov kub ntawm huab cua, qhov kub thiab qhov ceev ntawm cua yuav cuam tshuam rau qhov dej ntws hauv cov cement mortar thiab cov khoom siv gypsum. Yog li ntawd, nyob rau ntau lub caij sib txawv, muaj qee qhov sib txawv ntawm cov dej khaws cia ntawm cov khoom uas muaj tib qho hydroxypropyl methylcellulose ntxiv.
Hauv kev tsim kho tshwj xeeb, qhov cuam tshuam ntawm kev khaws dej ntawm cov slurry tuaj yeem hloov kho los ntawm kev nce lossis txo qhov ntau ntawm HPMC ntxiv. Kev khaws dej ntawm methyl cellulose ether nyob rau hauv qhov kub siab yog qhov qhia tseem ceeb los qhia qhov txawv ntawm qhov zoo ntawm methyl cellulose ether.
Cov khoom zoo heev hydroxypropyl methylcellulose series tuaj yeem daws tau qhov teeb meem ntawm kev khaws dej hauv qab qhov kub siab. Hauv lub caij kub siab, tshwj xeeb tshaj yog nyob rau hauv thaj chaw kub thiab qhuav thiab cov txheej txheem nyias nyias ntawm sab hnub ci, xav tau HPMC zoo los txhim kho kev khaws dej ntawm cov slurry.
HPMC zoo muaj kev sib xws zoo heev. Nws cov pab pawg methoxy thiab hydroxypropoxy tau faib sib npaug zos raws li cov saw hlau molecular cellulose, uas tuaj yeem txhim kho lub peev xwm ntawm cov pa oxygen ntawm cov hydroxyl thiab ether bonds los koom nrog dej los tsim cov hydrogen bonds. , yog li ntawd cov dej dawb dhau los ua dej khi, yog li kom tswj tau qhov evaporation ntawm cov dej los ntawm huab cua kub siab, thiab ua tiav cov dej khaws cia siab.
Yuav tsum muaj dej rau kev ua kom cov khoom siv cement xws li cement thiab gypsum khov kho. Qhov ntau ntawm HPMC kom raug tuaj yeem khaws cov dej noo hauv cov mortar ntev txaus kom cov txheej txheem khov kho thiab ua kom tawv tuaj yeem txuas ntxiv mus.
Tus nqi ntawm HPMC xav tau kom tau txais kev khaws cia dej txaus nyob ntawm:
1. Qhov nqus tau ntawm cov txheej hauv paus
2. Cov khoom xyaw ntawm cov tshuaj khib
3. Cov txheej txheem mortar tuab
4. Kev xav tau dej ntawm cov mortar
5. Lub sijhawm teeb tsa ntawm cov khoom siv gelling
Cov hydroxypropyl methylcellulose zoo tuaj yeem sib xyaw thiab sib kis tau zoo hauv cov cement mortar thiab gypsum-based cov khoom, thiab qhwv txhua yam khoom khov kho, thiab tsim cov zaj duab xis ntub dej, thiab cov dej noo hauv lub hauv paus maj mam tso tawm dhau lub sijhawm ntev, thiab cov tshuaj tiv thaiv hydration nrog cov khoom siv inorganic gelling kom ntseeg tau tias lub zog sib txuas thiab lub zog compressive ntawm cov khoom.
Yog li ntawd, nyob rau hauv kev tsim kho lub caij ntuj sov kub, txhawm rau kom ua tiav cov txiaj ntsig khaws cia dej, nws yog qhov tsim nyog los ntxiv cov khoom lag luam HPMC zoo hauv qhov ntau txaus raws li cov mis, txwv tsis pub, yuav muaj dej tsis txaus, txo lub zog, tawg, hollowing thiab shedding los ntawm kev qhuav ntau dhau. Cov teeb meem, tab sis kuj ua rau muaj teeb meem kev tsim kho ntawm cov neeg ua haujlwm. Thaum qhov kub poob qis, qhov ntau ntawm cov dej HPMC ntxiv tuaj yeem maj mam txo qis, thiab tib yam kev khaws cia dej tuaj yeem ua tiav.
Lub sijhawm tshaj tawm: Lub Ib Hlis-16-2023