Txheej txheem cej luam ntawm HPMC

Hydroxypropyl methyl cellulose (HPMC) yog ib qho cellulose ether uas tau siv dav hauv ntau yam lag luam xws li kev tsim kho, tshuaj, khoom noj, thiab kev saib xyuas tus kheej. HPMC yog cov dej-soluble polymer uas tsis yog-ionic uas yog muab los ntawm cellulose. Nws yog synthesized los ntawm reacting cellulose nrog propylene oxide thiab methyl chloride.

HPMC yog ntau yam polymer uas nthuav tawm ntau yam ntawm lub cev thiab tshuaj lom neeg. Nws muaj nyob rau hauv cov qib sib txawv nrog qhov sib txawv molecular hnyav, qib hloov pauv, thiab viscosities. Cov khoom no ua rau HPMC haum rau ntau daim ntawv thov hauv kev lag luam sib txawv.

Lub cev muaj zog ntawm HPMC:

1. Solubility: HPMC yog soluble hauv dej, tab sis nws solubility yog nyob ntawm qhov kev hloov pauv, qhov hnyav molecular, thiab kub.
2. Thermal stability: HPMC pom zoo thermal stability thiab tuaj yeem tiv taus kub txog 200 ° C.
3. Zaj duab xis-forming: HPMC tuaj yeem tsim cov yeeb yaj kiab nrog lub zog tensile zoo thiab yoog raws.
4. Adhesion: HPMC nthuav tawm cov khoom adhesion zoo thiab tuaj yeem siv los ua cov nplaum hauv ntau daim ntawv thov.
5. Rheological zog: HPMC nthuav tawm tus cwj pwm pseudoplastic, uas txhais tau hais tias nws cov viscosity txo qis nrog nce shear npaum li cas.

Chemical Properties ntawm HPMC:

1. Hydrophilicity: HPMC yog hydrophilic nyob rau hauv cov xwm thiab tuaj yeem nqus dej mus txog peb zaug nws qhov hnyav.
2. Tshuaj tiv thaiv: HPMC muaj cov tshuaj tiv thaiv zoo thiab tiv taus cov kua qaub, alkali, thiab ntsev daws.
3. Biodegradability: HPMC yog biodegradable thiab tsis ua mob rau ib puag ncig.

Kev siv ntawm HPMC:

1. Kev Lag Luam Kev Tsim Kho: HPMC tau siv dav hauv kev tsim kho kev lag luam raws li cov cement admixture. Nws yog ntxiv rau cov cement los txhim kho nws cov haujlwm ua haujlwm, tuav dej, thiab adhesion zog. HPMC kuj tseem siv rau hauv cov nplais nplaum, tshuaj khib, thiab stucco los txhim kho lawv cov kev ua tau zoo.
2. Kev Lag Luam Pharmaceutical: HPMC yog siv hauv kev lag luam kws tshuaj raws li kev sib khi, disintegrant, thiab thickener. Nws yog siv rau hauv cov ntsiav tshuaj formulations los txhim kho cov ntsiav tshuaj disintegration thiab dissolution zog. HPMC kuj tseem siv rau hauv cov tshuaj pleev ib ce xws li cream, tshuaj pleev, thiab gels ua cov thickener thiab emulsifier.
3. Kev lag luam khoom noj khoom haus: HPMC yog siv rau hauv kev lag luam khoom noj khoom haus ua cov thickener, emulsifier, thiab stabilizer. Nws yog ntxiv rau cov khoom noj xws li kua ntses, kua zaub, thiab hnav khaub ncaws los txhim kho lawv cov kev ntxhib los mos thiab ruaj khov.
4. Kev Lag Luam Kev Kho Tus Kheej: HPMC yog siv rau hauv cov khoom tu tus kheej xws li tshuaj zawv plaub hau, tshuaj pleev, thiab tshuaj pleev ib ce ua cov thickener thiab emulsifier. Nws kuj yog siv nyob rau hauv tshuaj pleev ib ce raws li ib tug zaj duab xis-yav tas los thiab binder.
5. Lwm yam kev lag luam: HPMC yog siv nyob rau hauv ntau yam kev lag luam xws li xim, number case, thiab textile industries ua ib tug thickener thiab stabilizer.

Hom HPMC:

1. Tsawg viscosity HPMC: Tsawg viscosity HPMC muaj qhov hnyav ntawm ib puag ncig 10,000 thiab siv rau hauv cov ntawv thov uas yuav tsum muaj viscosity tsawg, xws li cov coatings thiab luam ntawv inks.
2. Medium Viscosity HPMC: Nruab nrab viscosity HPMC muaj qhov hnyav molecular ntawm ib ncig ntawm 50,000 thiab yog siv rau hauv cov ntawv thov uas xav tau cov viscosity nruab nrab, xws li tshuaj thiab khoom siv kho mob.
3. High Viscosity HPMC: High viscosity HPMC muaj qhov hnyav molecular ntawm ib ncig ntawm 100,000 thiab yog siv rau hauv cov ntawv thov uas xav tau cov viscosity siab, xws li cov khoom siv thiab cov khoom noj khoom haus.

Qhov zoo ntawm kev siv HPMC:

1. Kev tuav dej: HPMC txhim kho cov dej tuav hauv cov ntaub ntawv tsim kho, uas ua rau muaj kev ua haujlwm tau zoo thiab ua haujlwm tau zoo.
2. Adhesion: HPMC txhim kho adhesion hauv cov ntaub ntawv tsim kho, uas ua rau muaj kev sib txuas zoo dua thiab txhim kho cov kav ntev.

Xaus

HPMC yog ntau yam thiab siv dav hauv cellulose ether uas pom cov ntawv thov hauv ntau qhov kev lag luam. Nws cov khoom tshwj xeeb, xws li thickening, dej tuav, thiab zaj duab xis-tsim, ua rau nws nrov additive nyob rau hauv kev tsim kho, tshuaj, khoom noj khoom haus, thiab kev tu tus kheej industries. Raws li qhov kev thov rau HPMC txuas ntxiv zuj zus, cov kws tshawb fawb tab tom tshawb nrhiav cov ntawv thov tshiab thiab tsim cov qib tshiab ntawm HPMC nrog cov khoom txhim kho kom tau raws li cov kev xav tau tshwj xeeb ntawm kev lag luam sib txawv.