Hydroxypropyl Methylcellulose (HPMC) yog cov khoom siv ntau yam siv thoob plaws ntau lub lag luam rau nws cov khoom tshwj xeeb.Los ntawm kev tsim kho rau tshuaj, khoom noj rau tshuaj pleev ib ce, HPMC pom nws daim ntawv thov nyob rau hauv ntau yam khoom.
1. Chemical Composition thiab Structure
HPMC yog ib tug semi-synthetic, inert, thiab dej-soluble polymer muab los ntawm cellulose.Chemically, nws yog tsim los ntawm cellulose caj qaum hloov nrog methoxy (-OCH3) thiab hydroxypropyl (-OCH2CH (OH) CH3) pawg.Qib ntawm kev hloov ntawm cov pab pawg no txiav txim siab txog cov khoom thiab kev ua haujlwm ntawm HPMC.Kev hloov pauv txheej txheem txhim kho cov dej solubility thiab lwm yam kev xav tau, ua rau nws tsim nyog rau ntau yam kev siv.
2. Rheological Properties
Ib qho ntawm cov laj thawj tseem ceeb ntawm kev siv HPMC yog nyob rau hauv nws cov khoom tshwj xeeb rheological.HPMC cov kev daws teeb meem nthuav tawm tus cwj pwm tsis yog Newtonian, uas qhia cov yam ntxwv ntawm pseudoplastic lossis shear-thinning yam ntxwv.Qhov no txhais tau hais tias cov viscosity txo qis nrog nce shear tus nqi, tso cai rau kev siv yooj yim dua thiab ua tiav.Xws li tus cwj pwm rheological yog qhov zoo tshwj xeeb hauv kev lag luam xws li kev tsim kho, qhov twg nws yog siv los ua tus neeg sawv cev thickening hauv cov ntaub ntawv cementitious, muab kev ua haujlwm zoo dua qub thiab txo qis qis.
3. Kev tuav dej
HPMC muaj peev xwm tuav tau dej siab vim nws qhov dej hydrophilic.Cov cuab yeej no yog qhov tseem ceeb hauv cov ntawv thov uas tswj cov dej noo yog qhov tseem ceeb, xws li hauv cov cement-based mortars thiab renders.Los ntawm kev nkag mus rau hauv cov dej hauv matrix, HPMC ua kom cov dej zoo ntawm cov cement hais, ua rau kev txhim kho lub zog, txo qis, thiab txhim kho durability ntawm cov khoom kawg.
4. Zaj duab xis tsim
Ntxiv rau nws lub luag haujlwm ua tus neeg ua kom tuab thiab khaws dej, HPMC tuaj yeem tsim cov yeeb yaj kiab pob tshab thiab hloov pauv tau thaum qhuav.Cov cuab yeej no pom kev siv hluav taws xob hauv kev lag luam xws li tshuaj thiab tshuaj pleev ib ce, qhov chaw HPMC ua haujlwm ua tus neeg ua yeeb yaj kiab hauv cov ntsiav tshuaj coatings, tswj-tso matrices, thiab cov tshuaj pleev ib ce.Lub peev xwm ua yeeb yaj kiab ntawm HPMC pab txhawb kev zoo nkauj, kev tiv thaiv, thiab tswj kev tso tawm ntawm cov khoom xyaw nquag hauv cov khoom zoo li no.
5. Binder thiab Adhesive
HPMC yog dav siv los ua cov ntawv khi thiab nplaum hauv ntau daim ntawv thov.Nyob rau hauv kws tshuaj, nws ua hauj lwm raws li ib tug binder nyob rau hauv cov ntsiav tshuaj formulations, pab nyob rau hauv lub compaction ntawm hmoov rau hauv cov ntsiav tshuaj cohesive.Nws cov khoom nplaum ua kom yooj yim particle khi, ua kom cov ntsiav tshuaj muaj kev ncaj ncees thiab cov yam ntxwv tawg.Ib yam li ntawd, nyob rau hauv kev tsim kho kev lag luam, HPMC ua raws li ib tug binder nyob rau hauv mortar thiab gypsum-raws li formulations, txhim kho adhesion rau substrates thiab tiv thaiv kev sib cais.
6. Tswj Tso Tawm
Lub peev xwm ntawm HPMC los tswj kev tso tawm ntawm cov khoom xyaw nquag ua rau nws muaj txiaj ntsig zoo hauv kev tsim tshuaj thiab kev ua liaj ua teb.Los ntawm kev hloov pauv cov ntsiab lus ntawm cov polymer, qhov hnyav molecular, thiab qib ntawm kev hloov pauv, kev tso tawm kinetics ntawm cov tshuaj lossis cov tshuaj agrochemicals tuaj yeem raug kho kom ua tiav cov kev xav tau kho lossis tshuaj tua kab.Qhov kev tso tawm cov txheej txheem no ua kom muaj kev ua haujlwm ntev, txo qhov kev siv tshuaj ntau zaus, thiab txhim kho kev ua haujlwm ntawm cov tshuaj nquag.
7. Stability thiab Compatibility
HPMC nthuav tawm kev ruaj ntseg zoo thiab kev sib raug zoo nrog ntau yam ntawm lwm cov khoom xyaw uas nquag siv hauv cov qauv.Nws yog chemically inert, non-ionic, thiab sib xws nrog ob qho tib si organic thiab inorganic tshuaj.Qhov no ua rau nws yog qhov kev xaiv zoo tshaj plaws rau cov neeg tsim khoom nrhiav kev ruaj khov thiab homogenous formulations hauv tshuaj, khoom noj khoom haus, cov khoom tu tus kheej, thiab cov ntawv thov kev lag luam.
8. Kev pom zoo kev nyab xeeb thiab kev tswj hwm
Lwm qhov tseem ceeb uas ua rau muaj kev siv dav dav ntawm HPMC yog nws cov ntaub ntawv kev nyab xeeb thiab kev tswj hwm kev pom zoo rau ntau daim ntawv thov.HPMC feem ntau suav hais tias muaj kev nyab xeeb (GRAS) los ntawm cov cai tswj hwm xws li US Food and Drug Administration (FDA) thiab European Food Safety Authority (EFSA).Nws yog non-toxic, non-irritating, thiab biocompatible, ua rau nws haum rau siv nyob rau hauv qhov ncauj, tshuaj pleev ib ce, thiab parenteral formulations, raws li zoo raws li nyob rau hauv cov khoom noj thiab tshuaj pleev ib ce.
9. Versatility
Tej zaum ib qho ntawm cov laj thawj tseem ceeb tshaj plaws rau qhov muaj koob npe ntawm HPMC yog nws qhov kev ua tau zoo.Nws cov khoom sib txawv ntawm cov khoom ua rau nws siv thoob plaws ntau lub lag luam thiab kev siv.Los ntawm kev hloov kho rheology ntawm cov txheej txheem kev lag luam txhawm rau txhim kho kev ua haujlwm ntawm cov tshuaj pleev ib ce, HPMC muab cov kev daws teeb meem rau ntau qhov kev sib tw ntawm kev tsim.Nws adaptability rau cov txheej txheem sib txawv thiab compatibility nrog ntau yam khoom xyaw ua rau nws yog ib qho kev xaiv rau formulators nrhiav txhim khu kev qha thiab multifunctional additives.
Hydroxypropyl Methylcellulose (HPMC) yog cov khoom siv ntau yam polymer uas tshuav nws qhov kev siv dav rau kev sib xyaw ua ke ntawm cov khoom tshwj xeeb thiab ntau yam kev siv.Los ntawm nws cov txiaj ntsig rheological hauv kev tsim kho cov ntaub ntawv rau nws cov yeeb yaj kiab-tsim peev xwm hauv cov tshuaj pleev xim, HPMC yog ib qho tseem ceeb ntxiv rau hauv ntau hom kev lag luam.Nws txoj kev nyab xeeb, kev ruaj ntseg, thiab kev sib raug zoo ntxiv ntxiv dag zog rau nws cov xwm txheej raws li qhov kev xaiv zoo tshaj plaws rau cov tsim qauv thoob ntiaj teb.Raws li kev siv thev naus laus zis thiab cov ntawv thov tshiab tau tshwm sim, qhov tseem ceeb ntawm HPMC xav tias yuav loj hlob ntxiv, tsav kev tsim kho tshiab thiab ua tau zoo hauv kev tsim khoom thoob plaws ntau yam haujlwm.
Post lub sij hawm: Mar-26-2024