Hydroxypropyl methylcellulose (HPMC)yog cov cellulose ether uas tsis yog ionic siv dav hauv cov ntaub ntawv tsim kho, tshuaj, khoom noj, tshuaj pleev ib ce thiab lwm yam lag luam. Cov ntsuas tseem ceeb ntawm HPMC suav nrog cov khoom siv lub cev thiab tshuaj lom neeg, solubility, viscosity, degree of substitution, thiab lwm yam.
1. Cov tsos thiab cov yam ntxwv tseem ceeb
HPMC feem ntau yog hmoov dawb los yog dawb tawm, tsis muaj ntxhiab, tsis muaj saj, tsis muaj tshuaj lom, nws yaj tau zoo hauv dej thiab ruaj khov. Nws tuaj yeem tawg thiab yaj sai hauv dej txias kom ua rau cov kua colloidal pob tshab lossis me ntsis turbid, thiab nws yaj tsis zoo hauv cov kuab tshuaj organic.
2. Qhov nplaum
Viscosity yog ib qho ntawm cov cim qhia tseem ceeb tshaj plaws ntawm HPMC, uas txiav txim siab qhov ua tau zoo ntawm AnxinCel®HPMC hauv ntau daim ntawv thov. Feem ntau, qhov viscosity ntawm HPMC yog ntsuas ua 2% aqueous kua ntawm 20 ° C, thiab qhov ntau ntawm viscosity yog txij li 5 mPa · s txog 200,000 mPa · s. Qhov siab dua qhov viscosity, qhov muaj zog ntawm cov nyhuv thickening ntawm cov kua thiab qhov zoo dua qhov rheology. Thaum siv rau hauv kev lag luam xws li kev tsim kho thiab tshuaj, qhov qib viscosity tsim nyog yuav tsum tau xaiv raws li qhov xav tau tshwj xeeb.
3. Cov ntsiab lus Methoxy thiab Hydroxypropoxy
Cov khoom siv tshuaj lom neeg ntawm HPMC feem ntau yog txiav txim siab los ntawm nws cov methoxy (–OCH₃) thiab hydroxypropoxy (–OCH₂CHOHCH₃) hloov pauv degrees. HPMC nrog cov qib hloov pauv sib txawv qhia txog kev yaj sib txawv, kev ua haujlwm ntawm qhov chaw thiab qhov kub gelation.
Cov ntsiab lus Methoxy: Feem ntau ntawm 19.0% thiab 30.0%.
Cov ntsiab lus Hydroxypropoxy: 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 khov thiab kev siv cov txiaj ntsig ntawm cov khoom.
5. Cov ntsiab lus tshauv
Cov tshauv yog cov seem tom qab HPMC raug hlawv, feem ntau yog los ntawm cov ntsev inorganic siv rau hauv cov txheej txheem tsim khoom. Cov ntsiab lus tshauv feem ntau raug tswj ntawm ≤1.0%. Cov ntsiab lus tshauv ntau dhau yuav cuam tshuam rau qhov pob tshab thiab kev huv ntawm HPMC.
6. Kev yaj thiab pob tshab
HPMC muaj cov dej solubility zoo thiab tuaj yeem yaj sai sai hauv dej txias los ua cov tshuaj colloidal sib xws. Qhov pob tshab ntawm cov tshuaj nyob ntawm qhov huv ntawm HPMC thiab nws cov txheej txheem yaj. Cov tshuaj HPMC zoo feem ntau yog pob tshab lossis me ntsis mis nyuj.
7. Kub Gel
Cov kua dej HPMC yuav tsim cov gel ntawm qee qhov kub. Nws qhov kub ntawm gel feem ntau yog nruab nrab ntawm 50 thiab 90 ° C, nyob ntawm cov ntsiab lus ntawm methoxy thiab hydroxypropoxy. HPMC nrog cov ntsiab lus methoxy qis muaj qhov kub ntawm gel siab dua, thaum HPMC nrog cov ntsiab lus hydroxypropoxy siab muaj qhov kub ntawm gel qis dua.
8. Tus nqi pH
Tus nqi pH ntawm AnxinCel®HPMC cov kua dej feem ntau yog nruab nrab ntawm 5.0 thiab 8.0, uas yog nruab nrab lossis tsis muaj zog alkaline thiab haum rau ntau yam kev siv ib puag ncig.
9. Qhov Loj ntawm Cov Khoom Me Me
Qhov zoo ntawm HPMC feem ntau yog qhia ua feem pua ntawm kev hla dhau 80-mesh lossis 100-mesh screen. Nws feem ntau yuav tsum tau ≥98% hla dhau 80-mesh screen kom ntseeg tau tias nws muaj kev sib kis zoo thiab solubility thaum siv.
10. Cov hlau hnyav
Cov hlau hnyav (xws li cov hlau lead thiab arsenic) ntawm HPMC yuav tsum ua raws li cov qauv kev lag luam. Feem ntau, cov hlau lead yog ≤10 ppm thiab cov hlau arsenic yog ≤3 ppm. Tshwj xeeb tshaj yog hauv cov khoom noj thiab tshuaj HPMC, cov kev cai rau cov hlau hnyav yog nruj dua.
11. Cov cim qhia txog kab mob me me
Rau cov tshuaj thiab cov khoom noj AnxinCel®HPMC, yuav tsum tswj cov kab mob me me, suav nrog tag nrho cov pawg, pwm, poov xab, E. coli, thiab lwm yam, feem ntau xav tau:
Tag nrho cov pawg neeg suav ≤1000 CFU / g
Tag nrho cov pwm thiab poov xab suav ≤100 CFU / g
Yuav tsum tsis txhob nrhiav tau E. coli, Salmonella, thiab lwm yam.
12. Cov chaw thov tseem ceeb
HPMC siv dav hauv ntau yam lag luam vim nws cov thickening, water retention, film-forming, lubrication, emulsification thiab lwm yam khoom:
Kev lag luam kev tsim kho: Ua ib qho thickener thiab dej retention agent hauv cement mortar, putty hmoov, vuas nplaum, thiab waterproof coatings los txhim kho kev ua haujlwm ntawm kev tsim kho.
Kev lag luam tshuaj: Siv ua cov nplaum, cov khoom siv tso tawm tas mus li, thiab cov khoom siv plhaub capsule rau cov ntsiav tshuaj.
Kev lag luam zaub mov: siv ua emulsifier, stabilizer, thickener, siv rau hauv jelly, dej haus, khoom ci, thiab lwm yam.
Kev lag luam tshuaj txhua hnub: siv ua cov khoom siv thickener thiab emulsifier stabilizer hauv cov khoom tu tawv nqaij, tshuaj ntxuav tes, thiab tshuaj zawv plaub hau.
Cov ntsuas kev ua haujlwm ntawmHPMCsuav nrog viscosity, qib ntawm kev hloov pauv (cov ntsiab lus hydrolyzed pawg), noo noo, cov ntsiab lus tshauv, tus nqi pH, gel kub, fineness, cov ntsiab lus hlau hnyav, thiab lwm yam. Cov ntsuas no txiav txim siab nws daim ntawv thov kev ua tau zoo hauv ntau qhov chaw sib txawv. Thaum xaiv HPMC, cov neeg siv yuav tsum txiav txim siab cov lus qhia tsim nyog raws li cov kev cai thov tshwj xeeb kom ntseeg tau tias muaj txiaj ntsig zoo tshaj plaws.
Lub sijhawm tshaj tawm: Lub Ob Hlis-11-2025