HydroxyPropyyl methylcellose (HPMC) ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua tau zoo thiab cov khoom ntawm gypsum plaster. Qhov no ntau yam ntxiv ua haujlwm ntau yam haujlwm, ua rau muaj kev ua haujlwm, cov nplaum, cov dej khaws cia, thiab txhua yam zoo ntawm cov plaster.
Cov qauv tshuaj thiab cov khoom:
HPMC belongs rau tsev neeg ntawm cellulose muaj kev hais ua neeg muaj kev pab, uas tau muab los ntawm cellulose, ib qho tshwm sim hauv cov phab ntsa ntawm tes. Los ntawm kev hloov kho tshuaj lom neeg, hydroxypropyl thiab methyl pawg tau qhia rau hauv kab mob cellulose, ua rau muaj kev tsim HPMC. Qhov kev hloov kho no uas cuam tshuam rau HPMC, suav nrog cov dej solubility, thermal gelation, ua yeeb yaj kiab ua yeeb yaj kiab, thiab cov yam ntxwv tuab.
Txheej txheem tsim khoom:
Zeem HPMC muaj ntau kauj ruam. Thaum pib, cellulose tau muab rho tawm los ntawm cov nroj tsuag cov khoom lag luam xws li ntoo pulp lossis paj rwb. Tom qab, no cellulose undergoes ethermalm thiab methyl pawg yuav txuas nrog cov pab pawg hydroxyl (-oh) cov pab pawg ua haujlwm ntawm cov cellulose molecules. Cov qib degree hloov pauv (DS) ntawm cov pab pawg tuaj yeem tswj tau thaum hluavtaws, cuam tshuam cov khoom ntawm cov khoom hpm kawg. Thaum kawg, lub txiaj ntsig HPMC yog huv, qhuav, thiab ua tiav rau ntau qib tsim nyog rau cov ntawv thov sib txawv.
Daim ntawv thov hauv Gypsum Plaster:
HPMC tau dav siv raws li kev ntxiv nyob rau hauv Gypsum Plaster cov qauv vim nws cov khoom muaj ntau yam. Thaum koom rau hauv cov plaster sib tov, HPMC ua raws li kev hloov kho rheology, tswj lub viscosity thiab ntws yam ntawm slurry. Qhov no ua kom cov haujlwm ua haujlwm ntawm plaster, tso cai rau kev thov kom yooj yim dua thiab smoother tau ua tiav.
Ntxiv mus, HPMC pabcuam ua tus neeg sawv cev dej, txo cov dej tsis zoo thaum lub chaw teeb tsa thiab qhuav. Qhov no lub caij nyoog dej txhawb nqa kev kho kom zoo ntawm cov plaster, ua kom muaj zog txhim kho thiab lub zog ua tiav ntawm cov khoom tiav. Tsis tas li ntawd, HPMC txhim kho cov nplaum ntawm cov nplaum ntawm cov nplaum rau ntau substrates, kom ntseeg tau tias muaj kev pheej hmoo ntawm kev cuam tshuam lossis tawg ua haujlwm.
Cov txiaj ntsig ntawm HPMC hauv Gypsum Plaster:
Txhim kho cov haujlwm ua haujlwm: HPMC imparts ib cream zoo sib xws rau cov plaster sib tov, ua rau nws yooj yim dua mus thiab tswj tau thaum lub sijhawm thov.
Kev ua kom cov dej ua kom tiav: los ntawm kev txo cov dej evaping, HPMC ntev txog cov txheej txheem hydrongs, ua rau kho tus kheej thiab tag nrho lub zog.
Cov ntawv nplaum zoo tshaj: HPMC txhawb nqa muaj zog adhesion ntawm cov plaster thiab substrate, tiv thaiv kev tawm tsam thiab ua kom muaj kev ntseeg siab ntev.
Lub sijhawm HPMC pab tswj lub sijhawm ntawm Gypsum plaster, tso cai rau lub sijhawm ua haujlwm tsim nyog tsis muaj kev sib txawv ntawm kev nyuaj kawg.
Tawg tsis kam: HPMC pab txhawb rau cohesiveness ntawm plaster sib tov, txo qhov tshwm sim ntawm shrinkage tawg thiab txhim kho saum npoo tiav.
HydroxyPropyyl Metylcellulose (HPMC) yog qhov tseem ceeb ntxiv rau hauv Gypsum plaster cov qauv, muab ntau yam ntawm cov txiaj ntsig uas ua rau muaj kev pab cuam zoo thiab kev ua tau zoo. Nws lub luag haujlwm ua rheology hloov kho, thiab cov roj ua ke ua rau nws tseem ceeb hauv kev tsim kho cov ntawv sau sab hauv ua tiav. Los ntawm kev nkag siab cov khoom siv tshuaj lom neeg thiab kev ua haujlwm ntawm HPMC, cov chaw tsim khoom thiab cov neeg ua haujlwm tuaj yeem ua kom tau raws li kev ua tau zoo thiab ua tiav cov txiaj ntsig zoo.
Lub Sijhawm Post: Feb-18-2025