Hydroxypropyl methyl cellulose HPMC yog cov cellulose ether uas tsis yog ionic ua los ntawm cov khoom siv polymer ntuj cellulose los ntawm ntau yam kev ua 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 turbid hauv dej txias. Nws muaj cov yam ntxwv ntawm thickening, bonding, dispersion, emulsification, zaj duab xis tsim, suspension, adsorption, gelation, surface activity, noo noo khaws cia thiab tiv thaiv colloid. Hydroxypropyl methylcellulose tuaj yeem siv rau hauv cov ntaub ntawv tsim kho, kev lag luam txheej, cov khoom siv hluavtaws, kev lag luam ceramic, tshuaj, khoom noj, textile, kev ua liaj ua teb, kev lag luam tshuaj txhua hnub thiab lwm yam lag luam.
Kev ua haujlwm khaws dej thiab lub hauv paus ntsiab lus: cellulose ether HPMC feem ntau ua lub luag haujlwm ntawm kev khaws dej thiab thickening hauv cement mortar thiab gypsum-based slurry, uas tuaj yeem txhim kho lub zog sib txuas thiab sag tsis kam ntawm slurry. Cov yam xws li 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, muaj qee qhov sib txawv ntawm cov dej khaws cia nyhuv ntawm tib tus nqi ntawm HPMC khoom. Hauv kev tsim kho tshwj xeeb, cov dej khaws cia nyhuv ntawm slurry tuaj yeem hloov kho los ntawm kev nce lossis txo qhov ntau ntawm HPMC ntxiv.
Qhov 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 HPMC series tuaj yeem daws tau qhov teeb meem ntawm kev khaws dej ntawm 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 nyias ntawm sab hnub ci, HPMC zoo yog qhov yuav tsum tau ua kom zoo dua qhov 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 tswj tau qhov evaporation ntawm cov dej los ntawm huab cua kub siab, thiab ua tiav cov dej khaws cia siab.
Cov cellulose HPMC zoo 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 kho, thiab tsim ib txheej ntawm cov zaj duab xis ntub dej. Cov dej hauv lub hauv paus maj mam tso tawm mus ntev. Cov khoom siv condensed dhau los ua cov tshuaj tiv thaiv hydration, 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 siab, txhawm rau kom ua tiav cov txiaj ntsig ntawm kev khaws cia dej, cov khoom lag luam HPMC zoo yuav tsum tau ntxiv rau hauv qhov ntau txaus raws li cov mis, txwv tsis pub, tsis txaus hydration, txo qis zog, tawg, hollowing thiab poob tawm yuav tshwm sim vim qhuav ntau dhau. Teeb meem, tab sis kuj ua rau muaj teeb meem ntawm cov neeg ua haujlwm tsim kho. Thaum qhov kub txo qis, qhov ntau ntawm HPMC ntxiv tuaj yeem maj mam txo qis, thiab tib yam dej tuav tau tuaj yeem ua tiav.
Qhov kev khaws cia dej ntawm HPMC raug cuam tshuam los ntawm cov hauv qab no:
1. Kev sib npaug ntawm cellulose ether HPMC
Hauv cov HPMC uas tau sib xyaw ua ke, cov pab pawg methoxy thiab hydroxypropoxy tau faib sib npaug zos, thiab tus nqi khaws dej siab.
2. Qhov kub ntawm cov cellulose ether HPMC hauv thermal gel
Qhov kub ntawm cov thermal gel siab, qhov ceev ntawm kev khaws dej siab; ntawm qhov tsis sib xws, qhov ceev ntawm kev khaws dej qis.
3. Viscosity ntawm cellulose ether HPMC
Thaum qhov viscosity ntawm 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 tiaj tus.
4. Ntxiv cov cellulose ether HPMC
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 dua nrog qhov nce ntawm qhov ntxiv; thaum qhov ntxiv ntxiv ntxiv, qhov nce ntawm qhov kev khaws dej qeeb qeeb.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-16-2021