HydroxyPropyyl Metylcellulose (HPMC) yog cov tshuaj polymer ntau yam nrog cov ntawv thov hauv ntau yam kev lag luam, kev tsim kho, khoom noj thiab cov tshuaj pleev ib ce, khoom noj thiab cov tshuaj pleev ib ce. Cov ntaub ntawv raw siv hauv HPMC synthesis yog muab tau los ntawm cov chaw ua si thiab yauv mus rau cov khoom siv tshuaj lom neeg kom tau txais cov khoom xav tau.
Cellulose: Cov Ntsiab Lus
Cov khoom siv raw rau hpmc yog cellulose, ib qho nyuaj carbohydrate pom hauv cov phab ntsa cell. Paj rwb thiab ntoo hauv av yog cov khoom siv ntawm cellulose. Cellulose fibers yog thawj zaug kho kom tshem tawm impurities thiab tom qab ntawd hydrolyzed mus tsoo lub cellulose saw rau hauv polysaccharides. Cov txheej txheem cuam tshuam nrog siv cov kua qaub lossis cov enzymes rau cleav rau hauv cellulose tam sim no hauv cellulose saw hu ua cellulose neeg muaj kev pab.
Propylene Oxide: Taw qhia txog HydroxyPropyl
Tom qab tau txais lub cellulose ether, cov kauj ruam tom ntej yuav qhia txog cov pab pawg hydroxyprropylropylropylropyl. Propylene oxide yog cov khoom siv tseem ceeb siv rau lub hom phiaj no. Nyob rau hauv lub xub ntiag ntawm cov alkaline catalyst, propylene oxide reacts nrog cov pab pawg hydroxyl ntawm lub cellulose ntawm hydroxyproproutyl pawg. Qhov kev tawm tsam no, hu ua Eetherification, ua lub luag haujlwm tseem ceeb hauv kev hloov lub cev thiab tshuaj ntawm cellulose, tsim hydroxyprropyl cellulose.
Methyl chloride: Ntxiv Metyl Group
Nyob rau hauv ib qho kev hloov kho tom ntej, methyl chloride yog siv los qhia methyl pawg mus rau lub cellulose cellebone. Cov txheej txheem no, hu ua methylation, muaj feem cuam tshuam nrog cov cellulose reaculose nrog methyl chloride nyob rau hauv lub xub ntiag ntawm lub hauv paus. Cov methyl pawg tau ntxiv rau hydroxyprropylencellulose los tsim hydroxypropenylsylsylcelylose (HPMC). Cov qib degree hloov pauv (DS) sawv cev rau cov pawg nruab nrab ntawm cov pawg me me hauv cov khoom noj ntawm cov khoom ntawm HPM zaum kawg ntawm HPMC.
ALKALI: nruab nrab thiab tswj viscosity
Tom qab etherification thiab methylation kauj ruam, qhov tshwm sim HPMC feem ntau yog alkaline. Lub hauv paus xws li sodium hydroxide yog siv rau neutralize cov khoom. Cov kauj ruam no yog qhov tseem ceeb heev kom ua tiav txoj kev xav kav pherly thiab txhim kho kev ruaj ntseg ntawm HPMC. Ntxiv ib lub hauv paus kuj tseem pab tswj lub viscos ntawm HPMC cov kev daws teeb meem, ua rau lawv haum rau ntau yam kev nkag mus rau qhov chaw ua haujlwm tseem ceeb, xws li cov tshuaj thiab cov khoom siv tsim khoom.
Purification thiab pom: ua kom zoo
Tom qab kev hloov kho tshuaj lom neeg, HPMC yog lim kom tshem tawm cov ntaub ntawv raw, los ntawm cov khoom lag luam, lossis cov khoom siv tsis zoo. Qhov kev ua kom muaj zog no yog ib txwm ua tiav siv cov txheej txheem kev pom, ua kom pom cov khoom HPM zaum kawg ua tau raws li cov qauv kev xav tau. Kev ua kom huv yog ib qho tseem ceeb rau kev tshem tawm cov khoom uas tsis muaj kev xav uas tuaj yeem cuam tshuam rau kev ua tau zoo thiab kev nyab xeeb ntawm HPMC hauv nws cov ntawv thov.
Cov ntawv thov ntawm hydroxypropy kas methylcellulose
Kws Tshuaj Kho Mob: HPMC tau siv dav hauv kev lag luam yog ib phau duab, zaj duab xis yav tas los thiab tso tawm cov qauv tso tawm hauv cov ntsiav tshuaj ua qauv. Nws lub peev xwm los ua cov na lug ua yeeb yaj kiab ua rau nws haum rau cov txheej txheem ntsiav tshuaj, muab cov txheej tiv thaiv thiab tswj cov tshuaj tso tawm.
Kev tsim kho: Hauv kev tsim kho kev tsim kho, HPMC yog siv hauv cov khoom tso cai ua ke xws li tshuaj cug, stucco, thiab pobzeb cov nplaum. Nws ua raws li cov tuab dua, dej tuav tus neeg sawv cev, thiab txhim kho cov haujlwm ua haujlwm thiab cov nplaum.
Kev lag luam khoom noj: HPMC yog siv rau hauv kev lag luam khoom noj ua cov tuab tuab, stabilizer thiab emulsifier thiab emulsifier thiab emulsifier thiab emulsifier thiab emulsifier thiab emulsifier thiab emulsifier thiab emulsifier thiab emulsifier thiab emulsifier thiab emulsifier thiab emulsifier thiab emulsifier. Nws yog siv ntau yam khoom noj, suav nrog cov kua ntses, hnav khaub ncaws thiab khoom qab zib.
Cov tshuaj pleev ib ce: hauv tshuaj pleev ib ce, HPMC yog siv nyob rau hauv cov qauv xws li cream, pleev tshuaj, thiab txhim kho kev ua tau zoo ntawm cov khoom.
Xim thiab pleev xim: HPMC yog siv los ua cov xim tuab thiab stabilizer nyob rau hauv cov xim av thiab txheej txheem los pab txhim kho cov rheology ntawm cov qauv.
Cov khoom siv saib xyuas tus kheej: HPMC muaj nyob hauv ntau yam khoom siv saib xyuas tus kheej, xws li cov khoom tu hniav thiab cov khoom siv plaub hau thiab hloov pauv.
HydroxyPropyyl methylulose yog ib lub polymer muaj txiaj ntsig zoo nrog ntau yam kev siv hauv ntau yam kev lag luam. Cov synthesis ntawm HPMC cuam tshuam nrog kev siv cov cellulose, propylene oxide, methyl chloride, alkali thiab lim cov khoom siv kom ntseeg tau cov khoom lag luam zoo. Cov versatility ntawm HPMC stems los ntawm nws lub peev xwm los hloov kho lub cev thiab tshuaj siv tseem ceeb hauv cov chaw muag tshuaj, khoom siv, cov tshuaj pleev ib ce thiab cov khoom siv saib xyuas tus kheej. Nkag siab cov ntaub ntawv raw thiab synthesis tseem ceeb rau kev ua kom tus HPMC rau cov ntawv thov tshwj xeeb thiab ua kom nws ua tau zoo hauv ntau yam qauv.
Lub Sijhawm Post: Feb-19-2025