Hydroxypropyl methylcellulose (HPMC) yog ib hom cellulose ether uas tsis yog ionic ua los ntawm cov khoom siv polymer ntuj cellulose los ntawm ntau yam txheej txheem tshuaj lom neeg. Lawv yog cov hmoov dawb tsis muaj ntxhiab, tsis muaj saj thiab tsis muaj tshuaj lom uas swells mus rau hauv cov kua colloidal meej lossis me ntsis cloudy hauv dej txias. Nws muaj thickening, binding, dispersing, emulsifying, film-forming, suspending, adsorbing, gelling, surfactant, moisture-retaining thiab protective colloid. Hydroxypropyl methyl cellulose thiab methyl cellulose siv tau rau hauv cov ntaub ntawv siv hauv kev tsim kho, kev lag luam xim, synthetic resin, kev lag luam ceramic, tshuaj, khoom noj, textile, kev ua liaj ua teb, tshuaj txhua hnub thiab lwm yam lag luam.
Cov nyhuv ntawm kev khaws dej thiab lub hauv paus ntsiab lus ntawm hydroxypropyl methylcellulose HPMC
Cellulose ether HPMC feem ntau ua lub luag haujlwm ntawm kev khaws dej thiab thickening hauv cov cement mortar thiab gypsum-based slurry, thiab tuaj yeem txhim kho lub zog sib koom ua ke thiab sag tsis kam ntawm cov slurry.
Cov yam xws li qhov kub thiab txias ntawm huab cua, qhov kub thiab txias 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 tus nqi ntawm HPMC ntxiv. Hauv kev tsim kho tshwj xeeb, cov dej khaws cia ntawm cov slurry tuaj yeem hloov kho los ntawm kev nce lossis txo tus nqi ntawm HPMC ntxiv. Kev khaws cia dej ntawm methyl cellulose ether nyob rau hauv qhov kub thiab txias yog qhov qhia tseem ceeb los qhia qhov txawv ntawm qhov zoo ntawm methyl cellulose ether. Cov khoom zoo heev HPMC series tuaj yeem daws tau qhov teeb meem ntawm kev khaws cia dej nyob rau hauv qhov kub thiab txias. Hauv lub caij kub thiab txias, tshwj xeeb tshaj yog nyob rau hauv thaj chaw kub thiab qhuav thiab kev tsim kho nyias nyias ntawm sab hnub ci, HPMC zoo yog qhov yuav tsum tau los txhim kho kev khaws cia dej ntawm cov slurry. HPMC zoo muaj kev sib xws zoo heev. Nws cov methoxy thiab hydroxypropoxy pawg 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 ntawd thiaj li tswj tau qhov evaporation ntawm cov dej los ntawm huab cua kub siab, thiab ua tiav qhov khaws cia dej siab.
Cov cellulose zoo HPMC tuaj yeem sib xyaw thiab sib kis tau zoo hauv cov cement mortar thiab gypsum-based cov khoom, thiab qhwv tag nrho cov khoom khov, thiab tsim cov zaj duab xis ntub dej, cov dej noo hauv lub hauv paus maj mam tso tawm ntev, thiab cov kua nplaum inorganic Cov tshuaj tiv thaiv hydration ntawm cov khoom coagulated yuav ua kom muaj zog sib txuas thiab lub zog compressive ntawm cov khoom. Yog li ntawd, hauv kev tsim kho lub caij ntuj sov kub siab, txhawm rau kom ua tiav cov txiaj ntsig khaws cia dej, nws yog qhov tsim nyog los ntxiv cov khoom zoo HPMC hauv qhov ntau txaus raws li cov mis, txwv tsis pub, yuav muaj dej tsis txaus, txo qis zog, tawg, hollowing thiab shedding los ntawm kev qhuav ntau dhau. 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 dej khaws cia tuaj yeem ua tiav.
Qhov kev khaws cia dej ntawm hydroxypropyl methylcellulose HPMC khoom nws tus kheej feem ntau cuam tshuam los ntawm cov hauv qab no:
Cov tshuaj HPMC sib npaug, methoxyl thiab hydroxypropoxyl tau faib sib npaug, thiab tus nqi khaws cia dej siab;
Cellulose ether HPMC thermal gel kub siab, tus nqi khaws dej siab; txwv tsis pub, tus nqi khaws dej qis;
Thaum qhov viscosity ntawm cellulose ether HPMC nce ntxiv, qhov ceev ntawm kev khaws dej kuj nce ntxiv; thaum qhov viscosity nce mus txog qee qib, qhov nce ntawm qhov ceev ntawm kev khaws dej feem ntau yuav maj mam;
Qhov ntau ntxiv ntawm cellulose ether HPMC, qhov siab dua ntawm kev khaws dej thiab qhov zoo dua ntawm kev khaws dej. Hauv qhov ntau ntawm 0.25-0.6% ntxiv, qhov kev khaws dej nce sai nrog rau qhov nce ntawm qhov ntxiv; thaum qhov ntxiv ntxiv ntxiv, qhov nce ntawm qhov kev khaws dej qeeb qeeb.
Lub sijhawm tshaj tawm: Lub Rau Hli-01-2023