Hydroxypropyl methylcellulose yog dab tsi?

1. Taw qhia

Hydroxypropyl methylcellulose (HPMC) yog siv dav hauv dej-soluble polymer muab tau los ntawm cellulose. Nws yog ib qho uas tsis yog-ionic, tsis muaj ntxhiab, tsis qab, dawb rau cov hmoov dawb uas tau siv dav hauv cov khoom noj, tshuaj, thiab tshuaj pleev ib ce. HPMC muaj ntau yam kev siv, suav nrog thickening, emulsifying, suspending, stabilizing, thiab film-forming. Nws kuj yog siv los ua ib qho kev sib khi, roj nplua nyeem, thiab disintegrant hauv kev tsim cov ntsiav tshuaj thiab tshuaj ntsiav.

2. Cov khoom siv raw

Cov khoom siv tseem ceeb siv los tsim HPMC yog cellulose, uas yog polysaccharide uas muaj cov piam thaj. Cellulose tuaj yeem tau txais los ntawm ntau qhov chaw, suav nrog ntoo pulp, paj rwb, thiab lwm yam nroj tsuag fibers. Cov cellulose yog tom qab ntawd kho nrog cov txheej txheem tshuaj los tsim hydroxypropyl methylcellulose.

3. Cov txheej txheem tsim khoom

Cov txheej txheem tsim khoom ntawm HPMC muaj ob peb kauj ruam. Ua ntej, cov cellulose raug kho nrog alkali, xws li sodium hydroxide, los tsim cov alkali cellulose. Qhov no alkali cellulose yog ces reacted nrog methyl chloride thiab propylene oxide los ua hydroxypropyl methylcellulose. Tom qab ntawd cov hydroxypropyl methylcellulose yog purified thiab qhuav los ua cov hmoov dawb.

4. Kev Tswj Xyuas Zoo

Kev tswj kom zoo yog ib feem tseem ceeb ntawm kev tsim khoom ntawm HPMC. Qhov zoo ntawm cov khoom yog txiav txim siab los ntawm purity ntawm cellulose, qib ntawm kev hloov ntawm pawg hydroxypropyl, thiab qib ntawm kev hloov ntawm methyl pawg. Lub purity ntawm cellulose yog txiav txim los ntawm kev ntsuam xyuas lub viscosity ntawm cov tshuaj, thaum lub degree ntawm hloov pauv yog txiav txim los ntawm kev ntsuam xyuas cov degree ntawm hydrolysis ntawm hydroxypropyl methylcellulose.

5. Ntim

HPMC feem ntau yog ntim rau hauv hnab lossis nruas. Lub hnab feem ntau yog ua los ntawm polyethylene lossis polypropylene, thaum lub nruas feem ntau yog ua los ntawm cov hlau lossis yas. Cov khoom ntim yuav tsum raug xaiv los xyuas kom meej tias cov khoom muaj kev tiv thaiv los ntawm cov dej noo thiab lwm yam ib puag ncig.

6. Cia

HPMC yuav tsum muab cia rau hauv qhov chaw txias, qhuav, kom deb ntawm tshav ntuj ncaj qha thiab lwm qhov chaw ntawm tshav kub. Cov khoom yuav tsum tau tiv thaiv los ntawm ya raws thiab lwm yam ib puag ncig.

7. Cov lus xaus

HPMC yog cov dej-soluble polymer uas tau siv dav los ntawm cellulose. Nws yog siv nyob rau hauv ntau yam kev lag luam, nrog rau cov zaub mov, tshuaj, thiab tshuaj pleev ib ce industries. Cov txheej txheem tsim khoom ntawm HPMC suav nrog ntau cov kauj ruam, suav nrog kev kho cellulose nrog alkali, cov tshuaj tiv thaiv ntawm alkali cellulose nrog methyl chloride thiab propylene oxide, thiab kev ua kom huv thiab ziab ntawm hydroxypropyl methylcellulose. Kev tswj kom zoo yog ib feem tseem ceeb ntawm cov txheej txheem tsim khoom, thiab cov khoom yuav tsum tau muab cia rau hauv qhov chaw txias, qhuav, deb ntawm tshav ntuj ncaj qha thiab lwm qhov chaw ntawm tshav kub.