HydroxyPropyyl methylulose (HPMC) thiab methyl hydroulose cellulose (MHEC) yog ob qho kev tsim kho ntawm Cellulose, cov chaw muag tshuaj, khoom noj, thiab tshuaj pleev noj, thiab tshuaj pleev ib ce. Txawm tias muaj kev sib qhia zoo sib xws hauv lawv cov qauv tshuaj thiab kev siv, muaj qhov sib txawv ntawm ob.
1. Tshuaj lom neeg:
HPMC (HydroxyPropyyl Metylcellulose): HPMC yog qhov hluavtaws hluavtaws semi-hluav taws xob ua tau los ntawm cellulose. Nws yog tsim los ntawm kev hloov kho tshuaj lom neeg ntawm cellulose, feem ntau muab rho tawm los ntawm ntoo pulp lossis cov paj rwb. Qhov hloov kho tau cuam tshuam nrog kev kho cellulose nrog alkali, ua raws li cov tshuaj pleev plaub dej thiab methyl cermes los qhia hydroxypropyl thiab methyl pawg mus rau lub cellulose cellebone.
MHEC (methyl hydrotyl cellulose): mHEC kuj yog lub cellulose ether tau los ntawm kev hloov kho tshuaj lom neeg ntawm cellulose. Zoo ib yam li HPMC, nws cov kev tiv thaiv etherification los qhia methyl thiab hydroxyethyl pawg mus rau lub cellulose. MHEC tau synthesized los ntawm kev kho cellulose nrog alkali, ua raws los ntawm etherification nrog methyl chloride thiab ethylene oxide.
2. Cov qauv tshuaj:
Thaum ob qho tib si HPMC thiab MHEC sib qhia lub cellulose caj qaum, lawv txawv ntawm cov hom thiab kev npaj ntawm cov kab qaum qaum no.
HPMC qauv:
Hydroxypropyl pawg (-ch2chohch3) thiab methyl pawg (-ch3) yog faib faib raws lub cellulose saw.
Qhov piv ntawm hydroxypropyl rau methyl pawg sib txawv raws li kev tsim khoom thiab cov khoom xav tau.
MHEC qauv:
Methyl thiab hydroxyethyl pab pawg (-ch2chohch3) tau txuas nrog lub cellulose caj qaum.
Qhov sib piv ntawm methyl rau hydroxyethyl pawg tuaj yeem hloov kho thaum synthesis kom ua tiav cov khoom tshwj xeeb.
3. Khoom:
HPMC Khoom:
HPMC cov khoom pov thawj dej ua kua dej siab solubility, ua cov pob tshab thiab cov kev daws teeb meem.
Nws muaj cov yeeb yaj kiab zoo heev-ua cov khoom, ua kom haum rau cov ntawv thov uas yuav tsum tau ua yeeb yaj kiab zaj duab xis.
HPMC muaj cov khoom zoo zoo thiab cov khoom siv khi khi, txhim kho cohesion hauv ntau yam qauv.
Lub viscos ntawm HPMC cov kev daws teeb meem tuaj yeem ua kom haum los ntawm kev kho cov qib hloov pauv thiab hnyav.
MHEC cov khoom:
MHEC tseem pom cov dej solubility, tab sis nws solubility yuav sib txawv nyob ntawm cov degree hloov chaw thiab kub.
Nws ua cov kev daws teeb meem zoo nrog pseudopastic tus cwj pwm, ua kom pom shear-thinning Properties.
MHEC muab cov kev siv ua kom zoo tshaj plaws thiab muaj zog hauv cov aqueous systems.
Zoo li HPMC, lub viscos, viscosity ntawm MHEC cov kev daws teeb meem tuaj yeem tswj los ntawm kev hloov kho qib ntawm kev hloov pauv thiab hnyav.
4. Daim Ntawv Thov:
HPMC daim ntawv thov:
Kev lag luam kev tsim kho: HPMC tau siv dav hauv cov cement-raws li cov plasters, thiab cov nplaum nplaum kom txhim kho cov haujlwm, khaws dej, thiab cov nplaum.
Kws Tshuaj: HPMC tab tom siv nyob rau hauv cov ntsiav tshuaj ntsiav tshuaj, tswj kev daws teeb meem, thiab npaj ua yeeb yaj kiab thiab mucoadhesive.
Khoom noj khoom haus thiab cov tshuaj pleev ib ce: HPMC pabcuam ua tus neeg sawv cev tuab tuab, stabilizer, thiab emulsifier hauv cov zaub mov, cov khoom saib xyuas tus kheej, thiab cov tshuaj pleev ib ce.
MHEC daim ntawv thov:
Kev lag luam tsim kev tsim kho: MHEC muaj feem ntau ua haujlwm hauv cov cementisitive cov tshuaj nplaum, ris tsho, thiab grouts los txhim kho dej tuav, ua haujlwm, thiab cov tshuaj nplaum.
Cov xim tsev thiab txheej txheem: MHEC yog siv los ua cov xim tha xim rheology hauv cov xim pleev xim rau hauv cov dej ua xim, tiv thaiv sagging, thiab txhim kho cov ntawv thov kev thov.
Kws Tshuaj Xyuas Cov Tshuaj: MHEC nrhiav cov ntawv thov raug tshem tawm, thiab npaj cov ntaub ntawv tso tawm los ua ib qho tuab thiab ua kom muaj zog thiab ruaj khov.
5. Cov txiaj ntsig:
Qhov zoo ntawm HPMC:
HPMC muaj cov khoom ua yeeb yaj kiab zoo tshaj plaws, ua rau nws haum rau cov ntsiav tshuaj pleev xim thiab muab tso tawm-tso tawm.
Nws ua kom pom cov khoom zoo zoo thiab cov cwj pwm khi cov yam ntxwv, txhim kho cov cohesion ntawm ntau yam tsim.
HPMC muab cov versatility hauv kev kho viscosity thiab kho cov teeb meem daws teeb meem.
Qhov Zoo Ntawm Mhec:
MHEC pom qhia tshwj xeeb ntawm kev ua kom zoo thiab ua rau muaj zog hauv cov xim aqueous, ua rau nws zoo tagnrho rau cov xim, thiab kws tshuaj.
Nws muaj cov khoom siv dej zoo, txhim kho cov haujlwm ua haujlwm thiab cov nplaum hauv cov khoom noj khoom haus.
MHEC muab tus cwj pwm tsis muaj patudroast, tso cai rau kev thov yooj yooj yim dua thiab txhim kho cov yam ntxwv zoo hauv cov txheej txheem thiab xim pleev xim.
Thaum ob qho tib si HPMC thiab MHEC yog cov kev ua cellulose uas muaj kev hais sib txuam nrog cov ntawv thov sib txawv, cov qauv sib txawv, cov qauv, thiab cov txiaj ntsig, thiab cov txiaj ntsig, thiab zoo. HPMC paub txog nws cov yeeb yaj kiab zoo tshaj plaws thiab cov nplaum ua kom zoo, hos mHec txawj ntse hauv cov teebmeem, ruaj khov, thiab cov dej ua kom ruaj khov. Nkag siab cov kev sib koom tseem ceeb no yog qhov tseem ceeb rau kev xaiv cov cellulose feem ntau ether rau kev siv hauv ntau yam kev lag luam.
Lub Sijhawm Post: Feb-18-2025