Dab tsi yog qhov sib txawv ntawm HPMC thiab CMC?

HPMC (HydroxyPropyylulcellulose) thiab cmc (cellulphethyl cellulose, siv tau siv cov zaub mov uas siv tau, siv tshuab, tsim kho thiab lwm thaj chaw.

1. Cov qauv tshuaj lom neeg thiab cov qauv npaj

HPMC:
Tus qauv tshuaj lom neeg: HPMC yog qhov hluav taws xob ib nrab polymer compound tau los ntawm reacting ntuj cellulose nrog eplene oxide thiab methyl chloride tom qab kho alkali.

Chav tsev tseem ceeb yog lub nplhaib muaj qab zib, uas tau txuas los ntawm 1,4-β-glucosid pawg, thiab qee pab pawg hydroxy (-chiv) thiab hydroxypropyl (-ch₂chopropyl).
Kev npaj hom: Ua ntej, cellulose tau kho nrog sodium hydrocide daws teeb meem, tom qab ntawd epylene oxide, thiab thaum kawg neutralized, ntxuav thiab qhuav kom tau hpmc.

CMC:
Tus qauv tshuaj lom neeg: CMC yog anionic cellulose derivative tau los ntawm reacting cellulose nrog chloroacetic acid nyob rau hauv Alkaline tej yam kev mob.
Chav tsev loj kuj tseem yog lub nplhaib zoo nkauj, txuas los ntawm 1,4-β-glucosidic bonds, thiab qee pawg hydroxyl tau hloov los ntawm Carboxymethyl (-ch₂Cooh).
Kev npaj hom: cellulose reacts nrog sodium hydroxide rau form alkali sorm, thiab thaum kawg neuttralizes, ntxuav thiab dries kom tau cmc.

2. Lub cev thiab tshuaj lom neeg.

Solubility:
HPMC: Soluble hauv dej txias thiab qee cov kuab tshuaj organic, insoluble hauv dej kub. Thaum cov tshuaj yog txias, lub pob tshab gel tuaj yeem tsim.
CMC: Soluble hauv dej txias thiab dej kub kom tsim lub kuab clocous.

Viscosity thiab rheology:
HPMC: Muaj cov nyhuv zoo thiab raug ncua kev ruaj khov nyob rau hauv cov tshuaj aqueous, thiab muaj pseudopantic (shear thinning) rheological cov khoom.
CMC: Muaj cov viscosity siab thiab cov teeb meem zoo hauv cov kua aqueous, qhia qhov thixotropy (thickening thaum nyob ruaj khov, thinning thaum stearded) thiab pseudoplastic.

3. Daim ntawv thov teb

HPMC:
Kev Lag Luam Khoom Noj: Raws li cov thickener, stabilizer, emulsifier thiab zaj duab xis yav tas los, siv mis nyuj, jelly, thiab lwm yam.
Kws Kev Lag Luam: Siv raws li phau ntawv, ua txhaum cai thiab tswj cov neeg sawv cev rau cov ntsiav tshuaj npaj.
Cov ntaub ntawv hauv tsev: Siv hauv cov nplaum cug thiab cov khoom lag luam gypsum los txhim kho cov dej khaws cia thiab ua haujlwm.
Cov tshuaj pleev ib ce thiab cov khoom siv saib xyuas tus kheej: siv rau hauv cov tshuaj pleev, cov tshuaj pleev xim, tshuaj ntxhua khaub ncaws, cov pa dej thiab lwm yam.

CMC:
Kev Lag Luam Khoom Noj: Raws li cov thickener, stabilizer thiab emulsifier, siv hauv jam, jelly, mis nyuj khov thiab dej haus.
Kws Kev Lag Luam: Siv raws li binder, disintterrant rau cov ntsiav tshuaj thiab cov yeeb yaj kiab qub rau cov tshuaj ntsiav tshuaj.
Kev Lag Luam Kev Lag Luam: Siv ua lub zog ntub dej rau sawv cev thiab cov neeg sawv cev sab saum toj los txhim kho lub zog qhuav thiab printability ntawm daim ntawv.
Textile kev lag luam: siv raws li cov neeg sawv cev thiab ua tiav tus neeg sawv cev los txhim kho lub zog thiab ci ntawm cov ntaub.
Kev lag luam txhua hnub: siv ua tuab thiab xaim thiab stabilizer rau tshuaj ntxuav, tshuaj txhuam hniav thiab tu cov khoom.

4. Kev tiv thaiv ib puag ncig thiab kev nyab xeeb

MPMC thiab CMC tsis muaj tshuaj lom thiab tsis muaj tshuaj lom thiab tsis muaj kev txiav txim siab los ntawm cov enzymes polymer hauv tib neeg lub cev thiab feem ntau suav tias yog cov khoom noj khoom haus nyab xeeb thiab tshuaj lom neeg. Lawv tau yooj yim nyob rau hauv ib puag ncig thiab muaj me ntsis qias neeg rau ib puag ncig.

5. Nqi thiab khoom lag luam

HPMC feem ntau yog siv nyob rau hauv liaj teb nrog kev ua tau zoo siab vim nws cov txheej txheem npaj nyuaj, tus nqi ntau yam thiab tus nqi siab.

Cov txheej txheem ntau lawm ntawm CMC yog qhov yooj yim, tus nqi qis, tus nqi yog kev lag luam zoo, thiab cov ntawv thov ntau yog dav.

Txawm hais tias HPMC thiab CMC yog ob qho tib si cellulose derivatives, lawv qhia tau vim lawv cov qauv tshuaj sib txawv, cov khoom sib txawv thiab cov ntawv thov. Qhov kev xaiv ntawm lub cellulose derivative los siv feem ntau yog nyob ntawm cov kev xav tau tshwj xeeb thiab kev saib xyuas kev lag luam.