Hypromellose yog dab tsi?

Hypromellose, tseem hu ua hydroxypropyl methylcellulose (HPMC), yog ib tug semisynthetic polymer muab tau los ntawm cellulose, uas yog ib txwm tshwm sim polymer pom nyob rau hauv lub cell phab ntsa ntawm cov nroj tsuag. Nov yog yuav ua li cas hypromellose ua:

1. Cellulose Sourcing: Cov txheej txheem pib nrog kev muab cov cellulose, uas tuaj yeem tau txais los ntawm ntau qhov chaw cog ntoo xws li ntoo pulp, paj rwb fibers, lossis lwm yam nroj tsuag fibers. Cellulose feem ntau yog muab rho tawm los ntawm cov peev txheej no los ntawm cov txheej txheem tshuaj thiab cov txheej txheem kom tau txais cov khoom siv cellulose purified.
2. Etherification: Cov purified cellulose tau txais kev hloov kho tshuaj hu ua etherification, qhov twg hydroxypropyl thiab methyl pawg tau nkag mus rau hauv cov pob txha cellulose. Qhov kev hloov kho no tau ua tiav los ntawm kev ua haujlwm ntawm cellulose nrog propylene oxide (kom qhia cov pab pawg hydroxypropyl) thiab methyl chloride (kom paub cov methyl pawg) nyob rau hauv kev tswj xyuas.
3. Purification thiab Kev Ua Haujlwm: Tom qab etherification, cov khoom lag luam tau txais kev lim dej kom tshem tawm impurities thiab cov khoom lag luam los ntawm cov tshuaj tiv thaiv. Lub purified hypromellose yog tom qab ntawd ua tiav rau hauv ntau hom xws li hmoov, granules, los yog cov kev daws teeb meem, nyob ntawm seb nws xav tau daim ntawv thov.
4. Kev Tswjhwm Zoo: Thoob plaws hauv cov txheej txheem tsim khoom, kev tswj xyuas kev ua tau zoo yog siv los xyuas kom meej qhov purity, sib xws, thiab kev ua haujlwm ntawm cov khoom hypromellose. Qhov no suav nrog kev sim rau qhov tsis xws li qhov hnyav molecular, viscosity, solubility, thiab lwm yam khoom siv lub cev thiab tshuaj.
5. Ntim thiab Kev faib tawm: Thaum cov khoom hypromellose ua tau raws li cov lus qhia zoo, nws tau ntim rau hauv cov thawv tsim nyog thiab muab faib rau ntau yam kev lag luam rau kev siv tshuaj, khoom noj khoom haus, tshuaj pleev ib ce, thiab lwm yam kev siv.

Zuag qhia tag nrho, hypromellose yog tsim los ntawm ntau cov tshuaj tiv thaiv tshuaj tiv thaiv thiab kev ua kom huv ntawm cov cellulose, uas ua rau muaj ntau yam thiab dav siv polymer nrog ntau hom kev siv hauv ntau yam lag luam.