Hydroxypropyl methylcellulose feem ntau yog siv los ua cov khoom tawg hauv kev tsim cov polyvinyl chloride, thiab 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 dej thiab thickening, uas tuaj yeem txhim kho lub zog sib koom ua ke thiab sag tsis kam ntawm slurry. Cov yam xws li huab cua kub, kub thiab cua ceev yuav cuam tshuam rau qhov volatilization ntawm dej hauv cement mortar thiab gypsum-based khoom. Yog li ntawd, nyob rau hauv ntau lub caij sib txawv, muaj qee qhov sib txawv ntawm cov dej khaws cia ntawm cov khoom nrog tib tus nqi ntawm hydroxypropyl methylcellulose ntxiv. Hauv kev tsim kho tshwj xeeb, cov dej khaws cia ntawm 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 zoo ntawm hydroxypropyl methyl cellulose ether. Cov khoom zoo heev hydroxypropyl methylcellulose series tuaj yeem daws qhov teeb meem ntawm kev khaws dej nyob rau hauv qhov kub siab. Hauv lub caij kub siab, tshwj xeeb tshaj yog nyob rau hauv thaj chaw kub thiab qhuav thiab kev tsim kho nyias-txheej ntawm sab hnub ci, HPMC zoo yog qhov yuav tsum tau los txhim kho kev khaws dej ntawm slurry.
Cov hydroxypropyl methylcellulose (HPMC) zoo muaj qhov 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 ua rau cov pa oxygen ntawm cov hydroxyl thiab ether bonds nce ntxiv. Lub peev xwm los koom nrog dej los tsim cov hydrogen bonds hloov cov dej dawb mus ua dej khi, yog li tswj tau cov dej evaporation los ntawm huab cua kub thiab ua tiav cov dej khaws cia siab. Dej yog qhov xav tau rau kev ua kom noo noo kom teeb tsa cov khoom cementitious xws li cement thiab gypsum. Qhov ntau ntawm HPMC kom raug tuaj yeem khaws cov dej noo hauv cov mortar ntev txaus kom cov txheej txheem teeb tsa thiab tawv tuaj yeem txuas ntxiv mus.
Tus nqi ntawm hydroxypropyl methylcellulose (HPMC) uas xav tau kom tau txais kev khaws cia dej txaus nyob ntawm:
Kev nqus dej ntawm txheej puag
Cov khoom xyaw ntawm Mortar
Cov txheej txheem mortar tuab
Kev xav tau dej ntawm cov av nplaum
Lub sijhawm teeb tsa ntawm cov khoom siv cementitious
Hydroxypropyl methylcellulose tuaj yeem sib xyaw ua ke thiab zoo hauv cov cement mortar thiab gypsum-based cov khoom, thiab qhwv txhua yam khoom khov, thiab tsim cov zaj duab xis ntub dej, cov dej noo hauv lub hauv paus maj mam tso tawm ntev, thiab nws sib xws nrog inorganic. Cov tshuaj tiv thaiv hydration ntawm cov khoom gelled ua kom 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: Plaub Hlis-10-2023