Cellulose thiab hydroxypropyf methylcellose (HPMC) yog ob qho tseem ceeb ntawm cov ntawv thov, tshwj xeeb hauv cov tshuaj, khoom noj, pleev zaub mov, thiab kev tsim kho. Thaum lawv qhia qee yam sib xws, lawv kuj muaj qhov sib txawv ntawm lawv cov qauv tshuaj, cov khoom, siv tau cov txheej txheem, thiab kev tsim khoom.
1. Dememical qauv:
Cellulose:
Cellulose yog polysaccharide muaj cov saw ntev ntawm cov hmoov av molecules sib txuas ua ke los ntawm β-1,4-glycosidic bonds. Nws yog lub ntsiab tivthaiv ntawm cov nroj tsuag ntawm tes, muab kev txhawb nqa cov txheej txheem thiab rigidity cog cov ntaub so ntswg. Cellulose molecules Ua microfibrils los ntawm hydrogen develing, koom tes rau lub zog thiab insolubility ntawm cellulose hauv dej thiab feem ntau cov kuab tshuaj organic.
HPMC:
HydroxyPropyyl methylcellose (HPMC) yog ib nrab hluavtaws polymer muab tau los ntawm cellulose los ntawm kev hloov kho tshuaj lom neeg. Nws yog tsim los ntawm kev kho cellulose nrog cov tshuaj pleev cov antylene oxide thiab methyl chloride los qhia hydroxyprropyl thiab methoxy pawg mus rau lub cellulose cellebone. Cov qib degree hloov pauv (DS) ntawm cov pawg no tuaj yeem sib txawv, cuam tshuam cov khoom ntawm HPMC xws li solubility, viscosity, thiab gelation tus cwj pwm, thiab kev coj tus cwj pwm.
Nplooj ntawv:
Cellulose:
Insolubility: Cellulose Ntshiab yog insoluble hauv dej thiab organic kuab tshuaj vim nws cov hydrogen ua kom zoo thiab crystalline qauv.
Biodegradity: cellulose yog biodegradable, ua rau nws ib puag ncig phooj ywg thiab haum rau ntau yam kev siv eco.
Neeg kho tshuab zog: cellulose fibulose muaj lub zog tensile lub zog, pab txhawb rau lawv siv hauv ntawv, textiles, thiab cov khoom siv.
Tsis muaj Reactivity: Cellulose yog cov inert thiab tsis yooj yim hnov cuam tshuam nrog lwm cov tebchaw nyob rau hauv ib txwm muaj.
HPMC:
Solubility: HPMC cov khoom ua pov tseg solubility hauv dej, ua cov pob tshab thiab cov ntsiab lus dav. Lub solubility nyob ntawm qhov xwm txheej xws li qib degree hloov chaw, hnyav hnyav, thiab kub.
Zaj duab xis tsim: HPMC tuaj yeem sau ua tiav thiab pob tshab cov yeeb yaj kiab thaum ziab, ua rau nws muaj txiaj ntsig hauv cov yees duab, ntim khoom noj, thiab ntim khoom noj, thiab lwm yam kev siv.
Viscosity: HPMC cov kev daws teeb meem tau kho viscosity raws li cov lus xws li kev xav tau, qhov kub thiab txias dua. Cov cuab yeej no yog qhov tseem ceeb hauv kev tswj hwm kev ua txhaum cai ntawm cov qauv.
Bioad Biadhesion: HPMC muaj cov yam ntxwv bioadhesive, tso cai rau nws ua raws li cov chaw muaj roj ntsha xws li mucosal membranes. Cov yeeb yaj kiab no tau siv tau rau hauv cov tshuaj ntawm cov tshuaj ntawm cov khoom xa tawm tshuaj.
3.Aplpications:
Cellulose:
Daim ntawv thiab cov duab los qhia: cov cellulose fibers yog cov khoom siv thawj rau cov ntawv thiab cov duab qhia los ntawm lawv cov nplua mais thiab lub zog.
Textiles: paj rwb, muaj cov muaj fiber ntau feem ntau yog ntawm cellulose, yog siv dav hauv kev lag luam textile rau cov khaub ncaws, upholstery, thiab lwm cov khoom npuag.
Cov ntaub ntawv hauv tsev: cov ntaub ntawv ntawm cov cellulose xws li ntoo, plywood, thiab particleboard yog ib txwm muaj nyob rau hauv kev tsim kho cov qauv txheej txheem thiab zoo nkauj.
Cov Khoom Noj Ntxiv: Kev ua zaub mov ntawm cellulose xws li microcrystalline cellulose tau siv raws li cov tuab me me, thiab cov neeg sawv cev hauv cov khoom noj.
HPMC:
Kws Tshuaj Tsim Tshuaj: HPMC yog qhov dav dav nyob rau hauv cov tshuaj uas yog cov phau ntawv qhia txog tus neeg sawv cev, tshuaj tua kab mob, thiab cov kev daws teeb meem ophtualmic, thiab cov txuj ci.
Cov khoom siv tsim kho: HPMC ntxiv rau cov khoom siv rau kev nplua nuj los txhim kho kev ua haujlwm, thiab cov dej ua haujlwm, thiab cov nplaum nplaum.
Kev Lag Luam Khoom Noj Khoom Haus: HPMC tau ua haujlwm ua cov tuab, emulsifier, disidilizess hauv ntau cov khoom noj khoom haus, suav nrog cov kua ntses, cov khoom qab zib, thiab cov nqaij.
Cov khoom siv saib xyuas tus kheej: HPMC muaj nyob hauv cov tshuaj pleev ib ce, tshuaj txhuam, thiab tshuaj txhuam hniav, thiab cov tshuaj txhuam hniav zoo li kev kho tus kheej, emulsifier, thiab zaj duab xis yav tas los.
4.Manufacturing Txheej Txheem:
Cellulose:
Cellulose feem ntau tau txais los ntawm kev cog ntoo los ntawm cov txheej txheem xws li cov neeg kho mob pulping (piv txwv li cov kab mob ferming), thiab cov kab mob cellulose). Cov muab rho tawm cellulose undergoes purification thiab kev ua kom tau txais ntau hom haum rau kev siv cov ntawv thov sib txawv.
HPMC:
Kev tsim HPMC muaj ntau cov kauj ruam, pib nrog kev rho tawm ntawm cellulose los ntawm cov ntoo lossis cov paj rwb. Lub cellulose tau kho nrog alkali kom tshem tawm cov alkali kom tshem tawm impurities ua ntej cov tshuaj lom ephlene oxide thiab methyl cermeside los qhia hydroxypropyl thiab mexoxy pawg, feem. Lub txiaj ntsig HPMC yog huv, qhuav, thiab milled mus rau hauv cov particle qhov loj me rau kev siv cov khoom lag luam.
Cellulose thiab HPMC yog ob qho tib si sib txuas nrog cov ntawv thov sib txawv thoob plaws ntau yam kev lag luam. Thaum lub hlwb cellulose yog lub ntuj polysaccharide pom nyob hauv cov phab ntsa ntawm tes, HPMC yog hloov kho ntawm cellulose nrog kev txhim kho solubility thiab ua haujlwm. Lawv qhov sib txawv ntawm cov qauv tshuaj, cov khoom, kev siv, thiab tsim cov txheej txheem tsim kom haum thiab cov ntaub ntawv tsim khoom siv thiab cov ntaub ntawv tsim kho. Nkag siab txog cov kev sib tshuam no yog qhov tseem ceeb rau kev siv cov khoom tshwj xeeb ntawm cellulose thiab HPMC hauv kev daws teeb meem tshiab thiab cov kev daws teeb meem kom muaj kev daws teeb meem.
Lub Sijhawm Post: Feb-18-2025