Hypromelose tau ua li cas?

Hypromellose, tseem hu ua HydroxyPropyyl methylulose (HPMC), yog semisynthetic polymer muab tau los ntawm cellulose pom hauv tsob ntoo cell. Kev tsim khoom ntawm hypromellose muaj ntau kauj ruam, suav nrog etherification thiab kev ua kom huv. Ntawm no yog ib tug txheej txheem cej luam ntawm yuav ua li cas Hypromellose yog tsim:

1. Cellulose hauv qab daus: Cov txheej txheem pib nrog cov cellulose hauv qab, uas tuaj yeem tau txais los ntawm ntau cov nroj tsuag, paj rwb fibers, lossis lwm cov nroj tsuag fibrous. Cellulose feem ntau tau muab rho tawm los ntawm cov peev txheej los ntawm cov txheej txheem thiab cov txheej txheem tshuab kom tau txais cov khoom siv ua kom huv.
2. Ethetification: cellule cellulose undergoes cov txheej txheem tshuaj lom neeg hu ua ethermalation, uas hydroxypropsyl thiab methyl pawg tau qhia rau lub cellulose caj qaum. Qhov kev hloov kho no tau ua tiav los ntawm kev rov ua haujlwm cellulose nrog propylene oxide (los qhia hydroxypropal (los qhia cov methyl pawg) nyob rau hauv cov xwm txheej.
3. Purification: Tom qab etherification, cov khoom lag luam undergoes purification kom tshem tawm impurities thiab cov khoom lag luam los ntawm cov tshuaj tiv thaiv. Qhov no yuav suav nrog kev ntxuav, ua kom pom tseeb, thiab lwm yam kev sib cais kom tau txais cov khoom ntshiab hypromellose.
4. Kom qhuav thiab milling: lub huv zoo hypromellose yog ces qhuav rau tshem tawm ntau dhau noo thiab milled rau hauv cov hmoov zoo los yog granules. Lub particle loj thiab morphology ntawm hypromellose hmoov tuaj yeem tswj tau kom tau raws li cov ntawv thov sib txawv.
5. Kev tswj kom zoo: thoob plaws hauv kev tsim khoom, kev tswj hwm zoo yog siv los xyuas kom meej meej, xwm yeem, thiab kev ua haujlwm ntawm hypromellose khoom. Qhov no suav nrog kev sim rau cov tsis muaj molecular hnyav, viscosity, solubility, thiab lwm lub cev thiab tshuaj lom neeg.
6. Ntim thiab faib khoom: Thaum Hypromellose cov khoom tau raws li cov thawv ntim tau zoo, nws tau ntim rau hauv cov chaw tsim khoom, khoom lag luam, tshuaj pleev ib ce, thiab lwm yam kev siv.

Zuag qhia tag nrho, kev tsim tawm ntawm hypromellose cuam tshuam nrog cov tshuaj lom neeg tswj hwm tau rau cellulose thiab dav siv polymer nrog ntau cov kev lag luam hauv ntau qhov kev lag luam.