Hydroxypropyl methylcellulose (HPMC) yog qhov tseeb ntawm ntau yam sib xyaw uas feem ntau siv los ua cov thickener hauv ntau qhov kev lag luam.
1. Taw qhia rau HPMC:
Hydroxypropyl methylcellulose (HPMC) yog ib qho hluavtaws polymer muab tau los ntawm cellulose, uas yog cov qauv tseem ceeb ntawm cov phab ntsa ntawm cov nroj tsuag.HPMC yog cov tshuaj hloov kho cellulose ether, qhov twg hydroxyl pawg ntawm cov pob txha cellulose tau hloov nrog ob pawg methyl thiab hydroxypropyl.Qhov kev hloov kho no txhim kho cov dej solubility thiab kev ruaj ntseg ntawm cellulose, ua rau nws haum rau ntau hom kev lag luam.
2. Cov khoom ntawm HPMC:
HPMC muaj ntau yam khoom uas ua rau nws ua tus neeg sawv cev thickening zoo tagnrho:
a.Dej Solubility: HPMC nthuav tawm cov dej solubility zoo heev, tsim cov kev daws teeb meem meej thaum yaj hauv dej.Cov cuab yeej no yog qhov tseem ceeb rau nws siv nyob rau hauv ntau yam aqueous formulations.
b.pH Stability: HPMC tuav nws cov khoom thickening tshaj pH dav, ua rau nws haum rau cov ntawv thov hauv acidic, nruab nrab, thiab alkaline ib puag ncig.
c.Thermal Stability: HPMC yog qhov ruaj khov ntawm qhov kub thiab txias, tso cai rau nws siv rau hauv cov qauv uas ua rau cov txheej txheem cua sov thaum tsim khoom.
d.Film-Forming Muaj peev xwm: HPMC tuaj yeem tsim cov yeeb yaj kiab hloov tau yooj yim thiab pob tshab thaum ziab, uas pom cov ntawv thov hauv cov coatings, films, thiab cov tshuaj ntsiav tshuaj.
e.Rheological Control: HPMC tuaj yeem hloov kho qhov viscosity thiab rheological tus cwj pwm ntawm kev daws teeb meem, muab kev tswj xyuas cov khoom ntws ntawm cov qauv.
3. Kev tsim cov txheej txheem ntawm HPMC:
Cov txheej txheem tsim khoom ntawm HPMC suav nrog ob peb kauj ruam:
a.Kev kho Alkali: Cellulose yog thawj zaug kho nrog cov tshuaj alkaline, xws li sodium hydroxide, kom cuam tshuam cov hydrogen bonds ntawm cellulose chains thiab o ntawm cellulose fibers.
b.Etherification: Methyl chloride thiab propylene oxide ces reacted nrog cellulose nyob rau hauv kev tswj tej yam kev mob los qhia methyl thiab hydroxypropyl pawg mus rau lub cellulose qaum, ua rau HPMC.
c.Purification: Cov khoom HPMC crude yog purified kom tshem tawm tej yam tsis muaj tshuaj lom thiab impurities, yielding high-purity HPMC hmoov los yog granules.
4. Kev siv ntawm HPMC ua cov Thickener:
HPMC pom dav siv raws li tus neeg sawv cev thickening nyob rau hauv ntau yam lag luam:
a.Kev Tsim Kho Kev Lag Luam: Hauv kev tsim cov ntaub ntawv xws li cementitious mortars, HPMC ua raws li cov kua nplaum thiab cov dej khaws cia, txhim kho kev ua haujlwm thiab adhesion ntawm mortar.
b.Kev lag luam khoom noj khoom haus: HPMC yog siv los ua cov thickener thiab stabilizer hauv cov khoom noj xws li kua ntses, kua zaub, thiab khoom qab zib, imparting viscosity thiab txhim khu kev ntxhib los mos.
c.Kev lag luam kws tshuaj: Hauv cov tshuaj formulations xws li ntsiav tshuaj thiab ncua kev kawm ntawv, HPMC ua hauj lwm pab raws li ib tug binder thiab thickening tus neeg sawv cev, pab txhawb kev sib faib ntawm cov khoom xyaw nquag.
d.Cov Khoom Siv Kho Tus Kheej: HPMC tau muab tso rau hauv cov tshuaj pleev ib ce thiab cov khoom tu tus kheej xws li tshuaj pleev, tshuaj pleev, thiab tshuaj zawv plaub hau kom muab cov viscosity, txhim khu kev ruaj ntseg, thiab txhim kho kev ntxhib los mos.
e.Xim thiab Txheej: HPMC yog ntxiv rau cov xim, txheej, thiab cov nplaum los tswj cov viscosity, tiv thaiv sagging, thiab txhim khu kev tsim cov yeeb yaj kiab.
Hydroxypropyl methylcellulose (HPMC) yog ib tug ntau yam thickening tus neeg saib xyuas nrog ntau yam kev siv nyob rau hauv ntau yam lag luam.Nws cov khoom tshwj xeeb, suav nrog dej solubility, pH stability, thermal stability, film-forming peev xwm, thiab rheological tswj, ua rau nws ib tug indispensable muaj nyob rau hauv ntau formulations.Los ntawm kev tsim cov khoom siv rau cov khoom noj, tshuaj, khoom tu tus kheej, thiab cov txheej txheem, HPMC ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov khoom lag luam thiab kev ua tau zoo.Kev nkag siab txog cov khoom thiab kev siv ntawm HPMC yog qhov tseem ceeb rau cov kws tsim qauv thiab cov tuam txhab tsim khoom nrhiav kev txhim kho lawv cov qauv thiab ua tau raws li cov neeg siv khoom xav tau.
Post lub sij hawm: Mar-08-2024