HydroxyPropyyl Metylcellulose (HPMC) yog qhov sib xyaw ntau ntau yam siv hauv kev lag luam ntau yam, xws li ntawm cov kws tshuaj los tsim kho. Nws cov khoom thiab cov ntawv thov muaj kev saib xyuas tseem ceeb, ua rau cov lus nug txog nws lub keeb kwm thiab kev sib xyaw ua ke, txawm hais tias nws yog cov khoom siv hluavtaws lossis ntuj.
1. Nkag siab hydroxypropyl methylcellose (HPMC)
HPMC yog kev hloov kho tshuaj hloov kho ntawm cellulose, ib qho tshwm sim polysaccharide pom hauv cov phab ntsa ntawm tes ntawm cov nroj tsuag. Nws yog muab tau los ntawm lub etherification ntawm cov roj pleev nrog cov roj pleev thiab methyl chloride, ua rau muaj cov khoom sib txawv uas txawv ntawm nws cov prefeor.
2. Cov txheej txheem hluavtaws
Cov synthesis ntawm HPMC suav nrog ntau kauj ruam. Thaum pib, cellulose tau muab rho tawm los ntawm cov nroj tsuag cov khoom lag luam xws li ntoo pulp lossis cov paj rwb. Qhov no cellulose kev kho nrog alkali los ua alkali cellulose. Tom qab, propylene oxide thiab methyl chloride tau qhia rau alkali cellulose nyob rau hauv cov mob uas tswj hwm, ua rau cov pab pawg hydroxylropyl thiab methyl pawg. Cov degree ntawm kev hloov pauv (DS) txiav txim siab cov khoom ntawm lub txiaj ntsig HPMC, suav nrog nws viscosity, solubility, thiab thermal tus cwj pwm, thiab thermal tus cwj pwm, thiab thermal tus cwj pwm, thiab thermal tus cwj pwm, thiab thermal tus cwj pwm, thiab thermal tus cwj pwm, thiab thermal tus cwj pwm, thiab thermal tus cwj pwm, thiab thermal tus cwj pwm, thiab thermal tus cwj pwm, thiab thermal tus cwj pwm, thiab thermal tus cwj pwm, thiab thermal tus cwj pwm, thiab thermal tus cwj pwm, thiab thermal tus cwj pwm, thiab thermal tus cwj pwm.
3. Molecular qauv qauv
Cov qauv molecular ntawm HPMC muaj cov kab sib dhos ntawm cov chav dej qab zib, akin rau cellulops, nrog methyl pawg txuas rau qee qhov ntawm hydroxyl (-oh) txoj haujlwm. Cov no hloov chaw hydrophiity thiab steric fond kev thaiv, hloov cov yam ntxwv ntawm lub cev thiab tshuaj lom neeg ntawm cov polymer. Cov degree thiab faib cov no hloov cov khoom polymer cov khoom, ua kom nws tuaj yeem tsim rau ntau yam kev siv.
4. Kev thov HPMC
HPMC nrhiav tau cov nqi hluav taws xob ntau thoob plaws kev lag luam sib txawv vim nws cov khoom tshwj xeeb:
Kws Tshuaj Kho Mob: Hauv cov tshuaj, hauv chaw HPMc pabcuam ua cov khoom siv tseem ceeb hauv cov tshuaj uas cov tshuaj, suav nrog cov ntsiav tshuaj, tsiav tshuaj, thiab cov txuj ci tseem ceeb. Nws ua raws li cov phau ntawv, viscosity concifivier, thiab zaj duab xis yav tas los, ua kom cov khoom xyaw tswj hwm ntawm cov khoom xyaw carraceutical (APIs) thiab txhim kho tus neeg mob ua raws.
Kev Tsim Kho: HPMC tau siv hauv cov khoom tsim cov khoom siv xws li cov kev cai tsaoob, plasters, thiab pobzeb cov nplaum. Nws ua haujlwm raws li cov tuab dua, cov dej tswj kav dej, thiab rheology kho kom zoo, txhim kho kev ua haujlwm, thiab cov khoom lag luam zoo nkauj.
Kev Lag Luam Khoom Noj: HPMC tau pom zoo rau kev siv cov khoom noj ntxiv, feem ntau yog cov khoom noj muaj zog, thiab cov khoom noj, cov khoom qab zib, thiab khoom noj mis, thiab khoom noj mis, thiab khoom noj mis, thiab khoom noj mis, thiab khoom noj mis, thiab khoom noj mis. Nws inert xwm thiab tsis muaj tshuaj lom rau nws muaj kev nyab xeeb rau kev noj.
Cov khoom siv saib xyuas tus kheej: HPMC tau koom rau cov tshuaj pleev ib ce, tawv nqaij, thiab kev saib xyuas plaub hau rau nws zaj duab xis, thickening, thiab stabilizing tej yam. Nws txhim kho cov khoom siv tshuaj, tsos, thiab kev ua tau zoo yam tsis muaj kev khaus khaus.
5. Khoom cua vs. ntuj sib koom
Kev faib tawm HPMC raws li cov hluavtaws lossis ntuj yog ib qho kev sib cav sib ceg. Ntawm ib sab tes, hpmc yog muab tau los ntawm cellulose, ib qho tshwm sim polymer perry ntau hauv cov nroj tsuag. Txawm li cas los xij, cov tshuaj lom neeg raug muab cuam tshuam nrog cov cuab yeej-ethermov nrog cov tshuaj pleev cov tsiaj pleev kom zoo nkauj thiab methyl chloride - ua rau muaj cov khoom sib txuas uas tsis pom nyob hauv nws cov ntuj counterpart. Ib qho ntxiv, kev tsim khoom tsim ntawm HPMC cuam tshuam nrog kev lag luam lag luam, uas yuav ua rau muaj kev txhawj xeeb txog nws cov khoom lag luam.
Profonents ntawm cov hluavtaws kev sib cav sib cav hais tias cov tshuaj uas cov tshuaj uas tau hloov kho ntawm cellulose hloov nrog cov yam ntxwv sib xyaw nrog cov yam ntxwv sib xyaw. Lawv hais txog kev koom tes ntawm cov hluavtaws reagents thiab cov txheej txheem nyob rau hauv kev tsim HPMC, qhia txog nws txoj kev ncaim ntawm lub celluling celluling.
Conversely, pab txhawb rau lub ntuj kev sib cais uas HPMC khaws cov qauv tseem ceeb ntawm cellulose, albeit nrog kev hloov kho. Lawv sib cav tias txij li cellulose tau muab los ntawm cov khoom cog ntoo txuas ntxiv, HPMC tuaj yeem suav hais tias yog qhov ua rau muaj kev cuam tshuam ntawm lub keeb kwm ntuj. Tsis tas li ntawd, lawv lees tias cov tshuaj lom neeg raug mob cuam tshuam nrog cov txheej txheem synthesis ua rau muaj nyob hauv qhov xwm, albeit nyob rau hauv kev tswj kev lag luam teeb tsa.
6. Kev txiav txim siab txiav txim siab
Los ntawm cov kev tswj hwm kev tswj hwm, kev faib tawm HPMC txawv nyob ntawm lub ntsiab lus thiab kev txiav txim siab. Hauv qee thaj tsam, xws li European Union thiab Asmeskas, HPMC yog feem ntau suav tias yog lub ntuj polymer muab tau los ntawm cellulose. Xws li, nws yog raug rau cov cai tswj hwm cov zaub mov ntxiv, kws tshuaj saib xyuas, thiab cov cosmeticingient.
Txawm li cas los xij, qee lub cev kev tswj hwm yuav ua rau muaj kev cai tshwj xeeb lossis kev txwv ntawm kev siv HPMC raws li nws cov qauv thov thiab cov qauv kev cai lij choj. Piv txwv li, Tshuaj-cov tshuaj-qib HPMC yuav tsum tau ntsib txoj kev nruj me ntsis txog kev coj dawb huv, thiab tsis muaj kev nyab xeeb thiab kev ua tau zoo rau cov tshuaj.
7. Xaus
HydroxyPropyyl methylcellose (HPMC) nyob hauv lub luag hauj lwm piv nyob thoob plaws ntau yam lag luam, tiv nqi rau nws cov khoom siv ntau yam thiab cov ntawv thov. Thaum nws synthesis muaj cov tshuaj lom neeg ntawm cov cellurring celluling cellule, kev sib cav sib ceg ib puag ncig nws cov kev faib tawm raws li cov hluavtaws lossis cov kaus ntuj nti. Caw ntawm ob qho kev xav ntawm ob qho kev xav ntawm cov kev sib cav, muaj kev cuam tshuam nrog kev sib cav sib ceg ntawm cov tshuaj synthesis, thiab keeb kwm ntuj.
Tsis hais txog nws cov kev faib tawm, HPMC tseem muaj nuj nqis rau nws cov haujlwm, kev nyab xeeb, thiab kev nyab xeeb. Raws li kev tshawb fawb txog kev tshawb fawb thiab kev tswj hwm kev nkag siab
Lub Sijhawm Post: Feb-18-2025