Hydroxypropyl methylcellulose (HPMC)yog ib qho non-ionic cellulose ether dav siv hauv cov khoom siv hauv tsev, tshuaj, zaub mov, tshuaj pleev ib ce thiab lwm yam lag luam. Cov kev qhia tseem ceeb ntawm HPMC suav nrog cov khoom siv lub cev thiab tshuaj lom neeg, solubility, viscosity, degree ntawm kev hloov pauv, thiab lwm yam.
1. Cov tsos mob thiab cov yam ntxwv tseem ceeb
HPMC feem ntau yog cov hmoov dawb lossis dawb dawb, tsis muaj ntxhiab, tsis qab, tsis muaj tshuaj lom, muaj dej solubility zoo thiab ruaj khov. Nws tuaj yeem tawg sai sai thiab yaj hauv dej txias los tsim cov pob tshab lossis me ntsis turbid colloidal tov, thiab muaj cov dej tsis zoo hauv cov kuab tshuaj organic.
2. Viscosity
Viscosity yog ib qho ntawm cov kev qhia tseem ceeb tshaj plaws ntawm HPMC, uas txiav txim siab qhov ua tau zoo ntawm AnxinCel®HPMC hauv ntau daim ntawv thov. Lub viscosity ntawm HPMC feem ntau yog ntsuas raws li 2% aqueous tov ntawm 20 ° C, thiab cov viscosity ntau yog los ntawm 5 mPa·s txog 200,000 mPa·s. Qhov siab dua qhov viscosity, lub zog thickening nyhuv ntawm cov tshuaj thiab qhov zoo ntawm rheology. Thaum siv hauv kev lag luam xws li kev tsim kho thiab tshuaj, cov qib viscosity tsim nyog yuav tsum raug xaiv raws li cov kev xav tau tshwj xeeb.
3. Methoxy thiab Hydroxypropoxy Cov ntsiab lus
Cov khoom siv tshuaj lom neeg ntawm HPMC feem ntau yog txiav txim siab los ntawm nws cov methoxy (–OCH₃) thiab hydroxypropoxy (–OCH₂CHOHCH₃) hloov qib. HPMC nrog cov kev hloov pauv sib txawv muaj qhov sib txawv solubility, kev ua haujlwm saum npoo thiab gelation kub.
Cov ntsiab lus Methoxy: Feem ntau ntawm 19.0% thiab 30.0%.
Hydroxypropoxy Cov ntsiab lus: Feem ntau ntawm 4.0% thiab 12.0%.
4. Cov ntsiab lus noo noo
Cov dej noo ntawm HPMC feem ntau tswj tau ntawm ≤5.0%. Cov dej noo ntau dua yuav cuam tshuam rau kev ruaj ntseg thiab siv cov khoom siv.
5. Tshauv Ntsiab Lus
Tshauv yog cov seem tom qab HPMC raug hlawv, feem ntau yog los ntawm cov ntsev inorganic siv hauv cov txheej txheem tsim khoom. Cov ntsiab lus tshauv feem ntau yog tswj ntawm ≤1.0%. Cov ntsiab lus tshauv siab dhau tuaj yeem cuam tshuam rau qhov pom tseeb thiab purity ntawm HPMC.
6. Solubility thiab pob tshab
HPMC muaj cov dej solubility zoo thiab tuaj yeem yaj sai sai hauv dej txias los tsim cov tshuaj sib xyaw colloidal. Lub pob tshab ntawm cov kev daws teeb meem yog nyob ntawm qhov purity ntawm HPMC thiab nws cov txheej txheem dissolution. Cov tshuaj HPMC zoo feem ntau yog pob tshab lossis me ntsis mis nyuj.
7. Gel Kub
HPMC aqueous tov yuav tsim ib gel ntawm ib tug tej yam kub. Nws qhov kub thiab txias yog feem ntau ntawm 50 txog 90 ° C, nyob ntawm cov ntsiab lus ntawm methoxy thiab hydroxypropoxy. HPMC nrog cov ntsiab lus methoxy qis muaj qhov kub thiab txias dua, thaum HPMC nrog cov ntsiab lus hydroxypropoxy siab muaj qhov qis dua gel.
8. tus nqi pH
Tus nqi pH ntawm AnxinCel®HPMC aqueous tov feem ntau yog nyob nruab nrab ntawm 5.0 thiab 8.0, uas yog nruab nrab lossis tsis muaj zog alkaline thiab haum rau ntau qhov chaw thov.
9. Particle loj
Qhov zoo ntawm HPMC feem ntau yog qhia raws li qhov feem pua tau dhau los ntawm 80-mesh lossis 100-mesh screen. Nws yog feem ntau yuav tsum tau hais tias ≥98% dhau los ntawm 80-mesh npo los xyuas kom meej tias nws muaj qhov zoo dispersibility thiab solubility thaum siv.
10. Cov ntsiab lus hnyav hlau
Cov ntsiab lus hlau hnyav (xws li txhuas thiab arsenic) ntawm HPMC yuav tsum ua raws li cov qauv kev lag luam. Feem ntau, cov ntsiab lus txhuas yog ≤10 ppm thiab cov ntsiab lus arsenic yog ≤3 ppm. Tshwj xeeb tshaj yog nyob rau hauv cov khoom noj thiab tshuaj qib HPMC, cov kev cai rau cov ntsiab lus ntawm cov hlau hnyav yog nruj dua.
11. Microbial ntsuas
Rau cov tshuaj thiab zaub mov qib AnxinCel®HPMC, yuav tsum tswj cov kab mob microbial, suav nrog tag nrho cov colony suav, pwm, poov xab, E. coli, thiab lwm yam, feem ntau xav tau:
Tag nrho cov colony suav ≤1000 CFU/g
Tag nrho cov pwm thiab cov poov xab suav ≤100 CFU / g
Yuav tsum tsis txhob kuaj pom E. coli, Salmonella, thiab lwm yam
12. Cov chaw thov tseem ceeb
HPMC yog dav siv nyob rau hauv ntau industries vim nws thickening, dej tuav, film-forming, lubrication, emulsification thiab lwm yam khoom:
Kev tsim kho kev lag luam: Raws li cov thickener thiab dej tuav tus neeg sawv cev hauv cov cement mortar, putty hmoov, pobzeb nplaum, thiab cov txheej dej tsis zoo los txhim kho kev tsim kho.
Kev lag luam kws tshuaj: Siv los ua cov nplaum, cov khoom siv tso tawm, thiab cov khoom siv tshuaj ntsiav tshuaj rau cov ntsiav tshuaj.
Khoom noj khoom haus kev lag luam: siv emulsifier, stabilizer, thickener, siv nyob rau hauv jelly, dej haus, ci khoom, thiab lwm yam.
Kev lag luam tshuaj txhua hnub: siv los ua cov thickener thiab emulsifier stabilizer hauv cov khoom tu tawv nqaij, detergents, thiab tshuaj zawv plaub hau.
Technical indicators, AsHPMCsuav nrog viscosity, degree ntawm kev hloov pauv (hydrolyzed pawg ntsiab lus), noo noo, cov ntsiab lus tshauv, pH nqi, gel kub, fineness, hnyav hlau cov ntsiab lus, thiab lwm yam. Thaum xaiv HPMC, cov neeg siv yuav tsum txiav txim siab qhov tsim nyog raws li kev thov tshwj xeeb kom ntseeg tau tias siv tau zoo tshaj plaws.
Lub sij hawm xa tuaj: Feb-11-2025