HydroxyPropyyl methylcellose (HPMC) yog kev sib xyaw ua ke ntau hauv ntau yam lag luam vim nws cov tshuaj sib xyaw ua ke thiab cov khoom.
1. Tshuaj lom neeg:
a. Cellulose caj qaum:
HPMC yog lub cellulose derivative, uas txhais tau tias nws yog muab los ntawm cellulose, lub ntuj polysaccharide pom hauv tsob ntoo phab ntsa. Cellulose muaj cov ntsuas kev rov ua dua ntawm β-d-flucose txuas los ntawm β (1 → 4) glycosidic bonds.
b. Hloov chaw:
Hauv HPMC, hydroxyl (-oh) moieto ntawm lub cellulose kab mob cellulose tau hloov nrog methyl thiab hydroxypropropsyl pawg. Qhov no hloov kev hloov pauv no tshwm sim los ntawm kev tiv thaiv kab ntsig. Qib ntawm kev hloov pauv (DS) yog hais txog tus naj npawb nruab nrab ntawm cov pawg hydroxyl hloov ib chav nyob rau hauv lub cellulose hauv lub cellulose saw. DS ntawm methyl thiab hydroxypropropyl yog qhov sib txawv, uas cuam tshuam rau kev ua haujlwm ntawm HPMC.
2. Synthesis:
a. Eetherification:
HPMC yog synthesized los ntawm lub etherification cov tshuaj tiv thaiv ntawm cellulose nrog cov tshuaj pleev kom qaib cov roj thiab methyl chloride. Cov txheej txheem cuam tshuam nrog cov celling cellulose nrog prinylene oxide los qhia cov pab pawg hydroxyproproutyl thiab tom qab ntawd nrog methyl chloride los qhia methyl pawg.
b. Qib ntawm Lwm Txoj Kev Tswj:
DS ntawm HPMC tuaj yeem tswj tau los ntawm kev kho kom haum raws li qhov kub thiab txias, thiab lub siab xav.
3. Kev Ua Haujlwm:
a. Solubility:
HPMC yog soluble hauv dej thiab qee cov kuab tshuaj organic, xws li methhanol thiab ethanol. Txawm li cas los xij, nws solubility txo qis nrog kev nce phaus thiab qib degree hloov chaw.
b. Zaj duab xis tsim:
HPMC ua cov pob tshab, cov yeeb yaj kiab hloov tau thaum yaj hauv dej. Cov yeeb yaj kiab no muaj cov khoom siv zoo muaj zog thiab cov khoom siv tsis muaj zog.
C. Viscosity:
HPMC cov kev daws teeb meem Pseudopastic tus cwj pwm, lub ntsiab lus tias lawv viscosity txo nrog nce shear tus nqi. Cov tshuaj volmos ntawm HPMC cov kev daws teeb meem yog nyob ntawm qhov xwm txheej xws li confentration, hnyav hnyav, thiab qib hloov chaw.
d. Dej khaws cia:
Ib qho ntawm cov khoom tseem ceeb ntawm HPMC yog nws lub peev xwm los khaws dej. Cov cuab yeej no yog qhov tseem ceeb hauv ntau yam kev siv xws li cov ntaub ntawv tsim kho, qhov twg HPMC yog siv los ua cov ntaub ntawv tuab thiab dej-khaws cia.
e. Adhesion:
HPMC feem ntau siv los ua cov nplaum hauv ntau qhov kev lag luam vim nws lub peev xwm los ua cov sib txuam uas muaj zog sib txawv.
4. Daim ntawv thov:
a. Kws Kev Lag Luam:
Hauv cov chaw muag tshuaj, HPMC yog siv los ua phau ntawv, zaj duab xis txheej tus neeg sawv cev, thiab viscosity concorifier hauv ntsiav tshuaj tsim.
b. Kev Lag Luam Kev Tsim Kho Kev Tsim Kho:
HPMC tau ntxiv rau cov Mement-raws li Cement-based cov plasters thiab pobzeb cov nplaum los txhim kho kev ua haujlwm, kom cov dej khaws cia thiab cov dej phwj.
C. Kev Lag Luam Khoom Noj:
Nyob rau hauv kev lag luam khoom noj, HPMC yog siv los ua cov tuab, stabilizer thiab emulsifier hauv cov khoom xws li cov kua ntses, hnav khaub ncaws thiab mis nyuj khov.
d. Cov khoom lag luam ntawm tus kheej:
HPMC yog siv los ua cov tuab dua, emulsifier thiab cov yeeb yaj kiab-sib sau tus neeg sawv cev rau cov khoom siv saib xyuas tus kheej xws li cov tshuaj zawv plaub hau, tshuaj pleev thiab cream.
e. Xim thiab pleev xim:
Hauv cov xim tsev thiab cov tsho tiv no, HPMC yog siv los txhim kho cov xim dispersion, viscosity tswj thiab dej khaws cia.
Hydroxypropyloostrose (HPMC) yog ib qho kev sib txuas ntxiv nrog ntau cov ntawv thov hla ntau yam lag luam thoob plaws hauv kev lag luam. Nws cov tshuaj sib xyaw tshwj xeeb, synthesis thiab cov khoom ua nws yog cov khoom tseem ceeb hauv cov chaw muag tshuaj, khoom siv thiab cov xim tsev thiab cov xim hlau. Nkag siab txog HPMC tso cai rau cov ntawv thov customized hauv ntau daim teb, ua rau nws siv dav dav thiab qhov tseem ceeb hauv kev tsim kho niaj hnub.
Lub sij hawm Post: Febroo 22-2024