Focus on Cellulose ethers

Hydroxypropyl methylcellulose ua li cas?

Hydroxypropylmethylcellulose (HPMC) yog ib qho hluavtaws polymer muab los ntawm cellulose. Raws li ib tug thickener, emulsifier thiab stabilizer, nws yog dav siv nyob rau hauv cov tshuaj, zaub mov thiab tshuaj pleev ib ce industries. HPMC kuj tseem siv rau hauv cov khoom siv xws li cement, mortar thiab gypsum los txhim kho kev ua haujlwm thiab khaws dej. Hauv tsab xov xwm no, peb yuav tham txog kev tsim HPMC thiab nws daim ntawv thov hauv ntau qhov kev lag luam.

HPMC ntau lawm

HPMC yog synthesized los ntawm reacting cellulose nrog propylene oxide thiab methyl chloride nyob rau hauv alkaline tej yam kev mob. Cov txheej txheem suav nrog cov kauj ruam hauv qab no:

Kauj Ruam 1: Kev kho Alkaline ntawm cellulose

Cov cellulose yog kho nrog cov tshuaj caustic ntawm sodium hydroxide los hloov nws mus rau alkaline cellulose. Qhov kev kho mob no ua rau cov pab pawg hydroxyl ntawm cellulose ntau dua reactive, pab txhawb cov kev tshwm sim tom ntej.

Kauj Ruam 2: Cov tshuaj tiv thaiv nrog propylene Oxide

Nyob rau hauv cov kauj ruam tom ntej, propylene oxide yog ntxiv rau alkaline cellulose nyob rau hauv kev tswj qhov kub thiab txias. Cov tshuaj tiv thaiv yog nqa tawm nyob rau hauv lub xub ntiag ntawm ib tug catalyst xws li ib tug tertiary amine los yog alkali hlau hydroxide. Propylene oxide reacts nrog hydroxyl pawg ntawm cellulose los tsim hydroxypropyl cellulose.

Kauj Ruam 3: Quaternization nrog Methyl Chloride

Hydroxypropylcellulose ces quaternized nrog methyl chloride los tsim HPMC. Cov tshuaj tiv thaiv yog nqa tawm nyob rau hauv alkaline tej yam kev mob, thiab cov degree ntawm quaternization tuaj yeem tswj tau los ntawm kev kho tus nqi ntawm methyl chloride.

Cov txiaj ntsig HPMC tau ntxuav, lim thiab qhuav kom tau txais cov hmoov dawb, dawb-ntws. Cov khoom ntawm HPMC, xws li viscosity, solubility, thiab gel zog, tuaj yeem hloov kho los ntawm kev hloov pauv qib (DS) ntawm hydroxypropyl thiab methyl pawg.

Kev siv HPMC

HPMC muaj ntau yam kev siv hauv ntau yam kev lag luam. Qee cov ntawv thov tseem ceeb tau tham hauv qab no:

Kev lag luam kws tshuaj

HPMC yog dav siv nyob rau hauv kev lag luam kws tshuaj raws li ib tug thickener, binder thiab zaj duab xis qub. Nws yog siv nyob rau hauv cov ntsiav tshuaj formulations los tswj kev tso tshuaj. HPMC ua raws li ib tug binder los ntawm compressing cov hmoov sib tov rau hauv ib tug ntau npaum li cas daim ntawv. Nws kuj tseem txhim kho cov solubility thiab bioavailability ntawm cov tshuaj tsis zoo soluble los ntawm kev ua kom ruaj khov thiab tsis sib xws.

kev lag luam zaub mov

HPMC yog siv rau hauv kev lag luam khoom noj khoom haus ua emulsifier, thickener thiab stabilizer. Nws yog feem ntau siv hauv cov khoom bakery, ice cream thiab khoom noj siv mis. HPMC txhim kho kev ntxhib los mos thiab sib xws ntawm cov khoom noj los ntawm kev tiv thaiv kev sib cais ntawm cov khoom xyaw thiab txo cov syneresis. Nws kuj txhim kho qhov saj thiab txee lub neej ntawm cov khoom noj.

Kev lag luam tshuaj pleev ib ce

HPMC yog siv rau hauv kev lag luam tshuaj pleev ib ce ua cov thickener thiab emulsifier. Nws yog siv nyob rau hauv daim tawv nqaij thiab plaub hau cov khoom xws li tshuaj pleev ib ce, cream, tshuaj zawv plaub hau thiab txias. HPMC txhim kho kev ntxhib los mos thiab sib xws ntawm cov khoom no thiab muab cov txiaj ntsig moisturizing thiab txias.

kev tsim kho kev lag luam

HPMC yog siv nyob rau hauv kev tsim kho kev lag luam raws li ib tug additive rau cement, mortar thiab gypsum. Nws txhim kho kev ua haujlwm thiab kev tuav dej ntawm cov ntaub ntawv no, yog li ua kom lawv lub zog thiab kav ntev. HPMC kuj txo qhov kev pheej hmoo ntawm kev tawg thiab shrinkage thaum ziab.

nyob rau hauv xaus

Hauv kev xaus, HPMC yog ntau yam thiab ntau yam polymer nrog cov ntawv thov hauv ntau qhov kev lag luam. Nws yog npaj los ntawm kev kho alkali ntawm cellulose, tshuaj tiv thaiv nrog propylene oxide, thiab quaternization nrog methyl chloride. Cov khoom ntawm HPMC tuaj yeem hloov kho los ntawm kev hloov pauv qib. HPMC ua lub luag haujlwm tseem ceeb hauv kev lag luam tshuaj, khoom noj, tshuaj pleev ib ce thiab kev tsim kho los ntawm kev txhim kho cov kev ntxhib los mos, sib xws thiab kev ua haujlwm ntawm ntau yam khoom. Nws tsis muaj tshuaj lom thiab biocompatibility ua rau nws muaj kev nyab xeeb thiab muaj txiaj ntsig zoo hauv cov kev lag luam no.


Post lub sij hawm: Aug-03-2023
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