Hydroxypropyl methyl cellulose hauv cement thiab gypsum raws li plaster

HPMC Hydroxypropyl methyl celluloseHauv cov cement mortar thiab gypsum slurry, feem ntau ua lub luag haujlwm ntawm kev khaws dej thiab thickening, tuaj yeem txhim kho qhov adhesion thiab sag tsis kam ntawm slurry.

Qhov kub ntawm huab cua, qhov kub thiab cua ceev tuaj yeem cuam tshuam rau qhov dej evaporation hauv cov cement mortar thiab gypsum raws li cov khoom. Yog li ntawd, nyob rau hauv ntau lub caij sib txawv, ntxiv hydroxypropyl methyl cellulose tib yam khoom dej khaws cia nyhuv muaj qee qhov sib txawv. Hauv kev tsim kho pob zeb, cov dej khaws cia nyhuv ntawm slurry tuaj yeem hloov kho los ntawm kev nce lossis txo qhov ntau ntawm HPMC. Kev khaws cia dej ntawm methyl cellulose ether ntawm qhov kub siab yog qhov qhia tseem ceeb los paub qhov zoo ntawm methyl cellulose ether.

Zoo heevhydroxypropyl methyl celluloseCov khoom lag luam 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 txheej nyias nyias ntawm sab hnub ci, qhov xav tau HPMC zoo los txhim kho kev khaws dej ntawm slurry; hydroxypropyl methyl cellulose (HPMC), uniformity zoo heev, nws yog cov pa oxygen thiab oxygen hydroxypropyl pawg sib npaug zos raws li cov saw hlau cellulose, tuaj yeem txhim kho hydroxyl thiab ether oxygen thiab dej ntawm qhov tseem ceeb sib txuas daim ntawv hydrogen bonding muaj peev xwm, ua rau dej dawb ntawm hydration, yog li kom zoo tswj cov huab cua kub los ntawm cov dej noo kom evaporate, Ua tiav kev khaws dej siab.

Cov khoom zoo ntawm hydroxypropyl methyl cellulose tuaj yeem sib xyaw thiab sib kis tau zoo hauv cov cement mortar thiab cov khoom plaster, thiab ntim txhua yam khoom khov, thiab tsim ib txheej ntawm cov zaj duab xis ntub dej, cov dej noo hauv lub hauv paus rau lub sijhawm ntev maj mam tso tawm, thiab cov khoom siv cementitious inorganic hydration reaction, yog li ua kom muaj zog sib txuas thiab lub zog compressive ntawm cov ntaub ntawv.

Hauv kev tsim kho, txhawm rau kom ua tiav cov txiaj ntsig ntawm kev txuag dej, xav tau ntxiv cov khoom zooHPMCcov khoom raws li cov mis, txwv tsis pub, yuav muaj kev ziab sai dhau los ntawm kev tsis txaus dej, txo lub zog, tawg, lub nruas khoob thiab poob qhov zoo, tab sis kuj ua rau cov neeg ua haujlwm nyuaj rau kev tsim kho. Thaum qhov kub txo qis, qhov ntau ntawm cov dej HPMC tuaj yeem maj mam txo qis, thiab tib yam kev khaws cia dej tuaj yeem ua tiav.