Hydroxypropyl methylcellulose yog dab tsi?

Hydroxypropyl methylcellulose (HPMC) yog ib qho hluavtaws, dej-soluble polymer muab tau los ntawm cellulose. Nws yog cov hmoov dawb, tsis muaj ntxhiab, tsis muaj qab hau uas tau siv dav los ua tus neeg sawv cev thickening, emulsifier, zaj duab xis qub, thiab stabilizer nyob rau hauv ntau lub lag luam, nrog rau cov tshuaj, khoom noj khoom haus, tshuaj pleev ib ce, thiab kev tsim kho.

HPMC yog tsim los ntawm reacting cellulose nrog propylene oxide thiab methyl chloride. Cellulose yog polysaccharide uas yog lub hauv paus tseem ceeb ntawm cov phab ntsa ntawm cov nroj tsuag thiab yog cov organic ntau tshaj plaws hauv ntiaj teb. Propylene oxide yog cov organic compound nrog cov tshuaj formula CH3CHCH2O. Methyl chloride yog ib qho tsis muaj xim, nplaim taws nrog cov ntxhiab tsw qab.

Cov tshuaj tiv thaiv ntawm cellulose nrog propylene oxide thiab methyl chloride ua rau tsim cov hydroxypropyl pawg, uas txuas nrog cov cellulose molecules. Cov txheej txheem no hu ua hydroxypropylation. Cov pab pawg hydroxypropyl ua rau kom cov dej solubility ntawm cellulose hauv dej, ua kom yooj yim rau kev siv ntau yam kev siv.

HPMC yog dav siv nyob rau hauv kev lag luam kws tshuaj raws li ib tug binder, disintegrant, thiab suspending tus neeg sawv cev nyob rau hauv cov ntsiav tshuaj thiab tsiav tshuaj. Nws kuj yog siv los ua cov thickener thiab emulsifier hauv cream thiab tshuaj pleev ib ce, thiab ua ib zaj duab xis qub hauv qhov muag tee. Hauv kev lag luam zaub mov, nws yog siv los ua cov thickener, stabilizer, thiab emulsifier hauv cov kua ntses, hnav khaub ncaws, thiab lwm yam khoom noj. Hauv kev tsim kho kev lag luam, nws yog siv los ua cov ntaub ntawv hauv cov cement thiab mortar, thiab ua cov dej-resistant txheej rau phab ntsa thiab cov plag tsev.

HPMC yog cov khoom siv nyab xeeb thiab tsis muaj tshuaj lom uas tau pom zoo los ntawm US Food and Drug Administration (FDA) siv rau hauv cov khoom noj, tshuaj, thiab tshuaj pleev ib ce. Nws kuj tau pom zoo los ntawm European Union (EU) rau kev siv khoom noj thiab tshuaj.