Hydroxypropylmethylcellulose (HPMC) yog kev hloov kho hluavtaws ntawm cellulose, ib qho polymer ntuj pom muaj nyob rau hauv cov phab ntsa cell ntawm cov nroj tsuag. Txawm hais tias HPMC nws tus kheej tsis yog biopolymer nkaus xwb vim nws yog cov tshuaj synthesized, nws feem ntau suav hais tias yog semi-Synthetic lossis hloov kho biopolymers.
A. Kev Taw Qhia Txog Hydroxypropyl methylcellulose:
Hydroxypropyl methylcellulose (HPMC):
Hydroxypropylmethylcellulose (HPMC) yog ib qho derivative ntawm cellulose, ib tug linear polymer muaj li ntawm glucose units. Cellulose yog lub ntsiab structural Cheebtsam ntawm cov nroj tsuag cell phab ntsa. HPMC yog ua los ntawm chemically modifying cellulose los ntawm kev ntxiv hydroxypropyl thiab methyl pawg.
B. Cov qauv thiab kev ua tau zoo:
1. Cov qauv tshuaj lom neeg:
Cov qauv tshuaj lom neeg ntawm HPMC muaj cov cellulose backbone units uas muaj hydroxypropyl thiab methyl pawg. Qib ntawm kev hloov pauv (DS) hais txog tus lej nruab nrab ntawm hydroxypropyl thiab methyl pawg ib chav glucose hauv cov saw cellulose. Qhov kev hloov pauv no hloov cov khoom siv lub cev thiab tshuaj ntawm cellulose, ua rau muaj ntau qib HPMC nrog ntau yam viscosities, solubility thiab gel zog.
2. Cov khoom siv lub cev:
Kev yaj: HPMC yaj hauv dej thiab tsim cov tshuaj ntshiab, ua rau nws yog cov khoom xyaw muaj txiaj ntsig zoo hauv ntau yam kev siv suav nrog tshuaj, khoom noj, thiab kev tsim kho.
Viscosity: Qhov viscosity ntawm HPMC kua tuaj yeem tswj tau los ntawm kev kho qhov degree ntawm kev hloov pauv thiab qhov hnyav molecular ntawm cov polymer. Cov khoom no yog qhov tseem ceeb rau cov ntawv thov xws li cov tshuaj formulations thiab cov ntaub ntawv tsim kho.
3. Kev Ua Haujlwm:
Cov Khoom Siv Thickeners: HPMC feem ntau yog siv los ua cov khoom siv thickener hauv cov khoom noj, tshuaj, thiab cov khoom siv tu tus kheej.
Kev Tsim Zaj Duab Xis: Nws tuaj yeem tsim cov zaj duab xis thiab tuaj yeem siv rau kev txheej cov ntsiav tshuaj thiab cov tshuaj ntsiav, nrog rau kev tsim cov zaj duab xis rau ntau yam kev siv.
Kev Khaws Dej: HPMC paub txog nws cov khoom khaws dej, pab txhim kho kev ua haujlwm thiab kev ua kom noo ntawm cov ntaub ntawv tsim kho xws li cov khoom siv cement.
C. Daim ntawv thov ntawm HPMC:
1. Cov Tshuaj:
Txheej ntsiav tshuaj: HPMC yog siv los tsim cov txheej ntsiav tshuaj kom tswj tau kev tso tawm tshuaj thiab txhim kho kev ruaj khov.
Kev xa tshuaj hauv qhov ncauj: Lub biocompatibility thiab cov khoom tso tawm tswj tau ntawm HPMC ua rau nws tsim nyog rau cov kab ke xa tshuaj hauv qhov ncauj.
2. Kev lag luam tsim kho:
Cov Khoom Siv Mortar thiab Cement: HPMC siv rau hauv cov ntaub ntawv siv hauv kev tsim kho kom txhim kho kev khaws dej, kev ua haujlwm tau zoo thiab kev nplaum.
3. Kev lag luam zaub mov:
Cov Khoom Siv Thickeners thiab Stabilizers: HPMC yog siv los ua cov khoom siv thickener thiab stabilizer hauv cov khoom noj kom txhim kho cov qauv thiab kev ruaj khov.
4. Cov khoom siv tu cev:
Kev Tsim Kho Kom Zoo Nkauj: HPMC tau muab tso rau hauv cov qauv tsim kom zoo nkauj rau nws cov khoom ua yeeb yaj kiab thiab cov khoom tuab.
5. Xim thiab Txheej Txheem:
Cov txheej txheem dej: Hauv kev lag luam txheej txheem, HPMC yog siv rau hauv cov qauv dej los txhim kho rheology thiab tiv thaiv cov xim tawg.
6. Kev xav txog ib puag ncig:
Txawm hais tias HPMC nws tus kheej tsis yog cov polymer uas lwj tag nrho, nws cov keeb kwm cellulosic ua rau nws zoo rau ib puag ncig piv rau cov polymers uas ua los ntawm cov khoom siv tag nrho. HPMC tuaj yeem lwj tag nrho hauv qee qhov xwm txheej, thiab nws siv rau hauv cov qauv uas ruaj khov thiab lwj tag nrho yog ib qho kev tshawb fawb txuas ntxiv mus.
Hydroxypropylmethylcellulose (HPMC) yog ib qho polymer ua los ntawm cellulose uas muaj ntau yam khoom siv. Nws cov yam ntxwv tshwj xeeb ua rau nws muaj txiaj ntsig zoo rau ntau yam lag luam xws li tshuaj, kev tsim kho, khoom noj, kev saib xyuas tus kheej thiab xim. Txawm hais tias nws tsis yog hom biopolymer ntshiab tshaj plaws, nws cov keeb kwm cellulose thiab lub peev xwm biodegradation yog raws li qhov kev thov loj hlob rau cov ntaub ntawv ruaj khov dua hauv ntau daim ntawv thov. Kev tshawb fawb txuas ntxiv mus tshawb nrhiav txoj hauv kev los txhim kho kev sib raug zoo ib puag ncig ntawm HPMC thiab nthuav nws txoj kev siv hauv cov qauv zoo rau ib puag ncig.
Lub sijhawm tshaj tawm: Lub Ob Hlis-07-2024