Ob leeg hydroxypropyl methylcellulose thiab hydroxyethyl cellulose yog cellulose

HydroxyPropyyl Methylcellulose (HPMC)Thiab hydroxyethyl cellulose (HEC) yog ob qho tseem ceeb cellulose siv dav hauv ntau yam kev lag luam vim lawv cov khoom tshwj xeeb. Thaum ob leeg tau muab los ntawm cellulose, lawv muaj cov qauv sib txawv thiab nthuav tawm cov yam ntxwv sib txawv thiab kev siv.

1. Taw qhia rau cellulose derivgatives:
Cellulose yog lub ntuj polysaccharide pom nyob rau hauv tsob ntoo cell phab ntsa, muaj cov kab ke ntawm cov piam thaj hauv cov dej qab zib txuas nrog los ntawm kev sib khi ntawm Glycosidic. Cellulose derivatives yog tau los ntawm cellically hloov cellulose kom txhim kho cov khoom tshwj xeeb lossis qhia cov haujlwm tshiab. HPMC thiab HEC yog ob lub derivatives muaj kev lag luam ntau yam nyob rau hauv kev lag luam xws li los ntawm cov kws tshuaj los tsim kho.

2. Synthesis:
HPMC yog synthesized los ntawm reacting cellulose nrog prinylene oxide los qhia hydroxyproprorropyl thiab tom qab methyl chloride los qhia methyl pawg. Qhov no ua rau cov pab pawg hauv hydroxyl hauv lub cellulose saw, yielding ib yam khoom nrog txhim kho solubility thiab zaj duab xis-ua yeeb yam.

HEC, ntawm qhov tod tes, yog tsim los ntawm celling cellulose nrog ethylene oxide rau comporporate hydroxyethethyl pawg. Qeb degree ntawm kev hloov pauv (DS) hauv HPMC thiab HEC tuaj yeem tswj hwm los ntawm kev kho lawv cov tshuaj xws li solubility, solubility, thiab kev coj tus cwj pwm, thiab kev coj ua gelation, thiab kev coj ua gelation, thiab kev coj ua gelation, thiab kev coj tus cwj pwm, thiab kev coj ua gelation, thiab kev coj ua gelation, thiab gelation.

3. Cov qauv tshuaj:
HPMC thiab HEC sib txawv hauv cov hom hloov pauv ntawm cov pab pawg hloov mus rau lub cellulose caj qaum. HPMC muaj ob qho tib si hydroxypropyl thiab methyl pawg, thaum hec muaj cov pab pawg hydroxyethyl pawg. Cov kev hloov pauv no tsis kam lees cov yam ntxwv tshwj xeeb rau txhua qhov kev sib tw, cuam tshuam lawv tus cwj pwm hauv ntau yam kev siv.

4. Lub zog lub cev:
Ob qho tib si HECC thiab HEC yog dej-soluble polymers nrog cov khoom siv thicking zoo heev. Txawm li cas los xij, lawv pom sib txawv hauv viscosity, hydration muaj peev xwm, thiab zaj duab xis-tsim muaj peev xwm. HPMC feem ntau muaj cov viscosity rau HEC ntawm cov kev sib npaug, ua kom haum rau cov ntawv thov yuav tsum tau siv ntau dua cov kev siv.

Ib qho ntxiv, HPMC cov ntaub ntawv ci ntsa iab thiab ntau cohesive filmed vim nws cov methyl hloov, whereas HEC ntawv softer thiab hloov dua tshiab yooj yim. Cov kev sib txawv no hauv cov yeeb yaj kiab ua kom haum rau txhua daim ntawv tsim nyog rau cov ntawv thov tshwj xeeb hauv cov tshuaj, cov khoom lag luam ntawm tus kheej, thiab khoom noj khoom noj.

5. Daim Ntawv Thov:
5.1 Kev Lag Luam Kws Tshuaj:
Ob qho tib si HPMC thiab HEC tau siv dav hauv cov kws tshuaj tsim ua raws li cov neeg ua haujlwm, thickeners, thiab zaj duab xis-txheej-txheej. Lawv txhim kho cov ntsiav tshuaj muaj kev ncaj ncees, tswj cov tshuaj tawm, thiab txhim kho lub qhov ncauj rau cov kua ua kua. HPMC yog qhov xav tau rau kev tso tawm cov yeeb yaj kiab vim nws cov kev daws teeb meem thiab cov tshuaj pleev ib txwm muaj rau hauv cov tshuaj pleev thiab cov tshuaj pleev thiab sib xyaw nrog roj ntsha.

5.2 Kev Lag Luam Kev Tsim Kho:
Hauv kev tsim kho kev tsim kho,HPMCthiabTus paUa haujlwm raws li cov khoom sib ntxiv hauv cov ntaub ntawv caa, xws li mortars, gutsws, thiab renders. Lawv txhim kho cov haujlwm ua haujlwm, khaws cia, thiab cov nplaum, ua rau muaj kev ua tau zoo thiab ruaj khov ntawm cov khoom kawg. HPMC feem ntau nyiam rau nws lub peev xwm kom muaj peev xwm ntau dua, uas minimizes tawg thiab txhim kho lub sijhawm.

5.3 Cov khoom siv saib xyuas tus kheej:
Ob qho tib si derivatives nrhiav cov ntawv thov hauv cov khoom siv saib xyuas ntawm tus kheej xws li cov tshuaj zawv plaub hau, muaj cov tshuaj pleev xim, thiab cov tshuaj pleev xim ua cov neeg sawv cev ua kom huv, thiab stabilizers. Hec caparts ib txoj kev du thiab ci zoo nkauj rau cov qauv, ua rau nws haum rau cov khoom tu plaub hau thiab cov tawv nqaij. HPMC, nrog nws cov khoom siv ua yeeb yaj kiab zoo tshaj plaws, yog siv rau hauv cov khoom noj hnub ci thiab pleev xim uas xav tau cov dej tsis kam thiab ntev.

5.4 Khoom Noj Khoom Noj:
Hauv kev lag luam khoom noj khoom haus, HPMC thiab HECC thiab HECC thiab HECCC thiab cov neeg sawv cev ua haujlwm ua kom tuab, thiab texturizers hauv ntau cov khoom lag luam suav nrog cov ntses, hnav khaub ncaws, thiab cov khoom qab zib. Lawv txhim kho lub ntsiab lus, tiv thaiv kev pab cuam, thiab txhim kho cov kev xav ntawm cov khoom noj ua haus. HPMC feem ntau nyiam rau nws txoj kev pom meej thiab ua kom haum rau cov ntawv thov uas xav tau pob tshab gels thiab emulsions ruaj khov.

6. Xaus:
HydroxyPropyyl methylulose (HPMC) thiab hydroxyethyl cellulose (HEC) yog cellulose cellulatives nrog cov tshuaj sib txawv, cov khoom, thiab kev siv. Thaum ob qho tib si muab cov khoom siv ua kom zoo tshaj plaws thiab ua yeeb yaj kiab ua yeeb yam, lawv nthuav tawm qhov sib txawv, zaj duab xis clarity, thiab hydration tus cwj pwm. Nkag siab cov kev sib txawv no yog qhov tseem ceeb rau kev xaiv qhov tsim nyog rau cov ntawv thov tshwj xeeb thoob plaws kev lag luam xws li cov tshuaj, kev saib xyuas tus kheej, thiab khoom noj. Raws li kev tshawb fawb txuas ntxiv ua ntej, kev hloov kho ntxiv thiab cov kev siv ntawm cellulose derivatives xav tau, pab txhawb rau lawv txuas ntxiv hauv ntau txoj haujlwm.