Dab tsi yog cov ntaub ntawv nyoos ntawm hydroxypropyl methylcellose (HPMC)?

2. Sodium hydroxide (Naoh)
Sodium hydroxide (Naoh) yuav tsum muaj rau pretreatment thiab alkalization ntawm cellulose. Nws lub ntsiab ua haujlwm suav nrog:
O cellulose molecules thiab nce kev ua si;
Ua kom puas ntawm thaj chaw cellulose kom nws yooj yim dua kom dhau los ntawm kev tawm tsam thaj tsam herov;
Txhawb nqa methylation tom qab methylation thiab hydroxypropration.

3. Methyl chloride (Ch₃cl)
Methyl chloride (methyl chloride) yog tus tseem ceeb reagent rau methylation cov tshuaj tiv thaiv nyob rau hauv kimacell ®pmc ntau lawm. Nws reacts nrog alkalized cellulose los hloov qee pawg hydroxyl (-oh) nrog cov pab pawg methoxy (-och₃) los uaMethyl Cellulose (MC), Li no txhim kho cov solubility thiab tshuaj kho thiab tshuaj ntawm cellulose.

4. Propylene Oxide (C₃H₆O)
Propylene oxide yog siv nyob rau hauv hydroxyprropation, uas tuaj yeem qhia hydroxypropyl (-ch₂choh₃) ntawm lub cellulose molecular molecular molecular Kev qhia txog ntawm hydroxypropyl tuaj yeem:
Ntxiv txhim kho cov dej solubility ntawm HPMC;
Txhim kho cov viscosity thiab rheological cov yam ntxwv ntawm nws cov kev daws teeb meem;
Txhim kho nws qhov ruaj khov ntawm ntau qhov kub.

5. Hnyav (dej lossis organic kuab)
Dej los yog cov kuab tshuaj organic (xws li isoopropanol, methanol, thiab lwm yam) yog siv cov txheej txheem sib xyaw ua ke los pab cov khoom siv sib xyaw ua ke thiab kev tswj hwm. Tsis tas li ntawd, qee cov kuab tshuaj yog siv los tshem tawm cov khoom uas tsis raug rau hauv kev lim dej ua ntu zus thiab ntxhua kom meej kom ntseeg tau cov khoom lag luam.

6. Acc acidic lossis alkaline catalyst
Txhawm rau kom ua kom tau zoo rau cov tshuaj tiv thaiv cov kev mob thiab txhim kho cov txheej txheem ntawm cov roj ntsha li cas los hloov tus nqi pH yog li cov tshuaj tiv thaiv tuaj yeem pib ua raws li kev tshwm sim hauv qab.

7. Lwm cov ntaub ntawv auxiliary raw
Qee cov stabilizers, inhibitors lossis lwm yam kev siv tshuaj ntxiv rau hauv HPMC, txhim kho nws qhov ruaj khov, thiab tswj nws lub cev thiab tshuaj lom neeg.