Hydroxypropyl methylcellulose (HPMC)yog ib qho tseem ceeb cellulose derivative uas yaj tau hauv dej nrog ntau yam kev siv, feem ntau yog hauv tshuaj, khoom noj, tshuaj pleev ib ce, kev tsim kho thiab lwm yam kev lag luam. HPMC yog hmoov dawb lossis dawb tawm, tsis muaj saj thiab tsis muaj ntxhiab uas yaj hauv dej thiab tuaj yeem tsim cov kua pob tshab, khov. Nws cov yam ntxwv tuaj yeem soj ntsuam los ntawm ntau yam xws li cov qauv tshuaj, cov khoom siv lub cev, thiab cov teb siv.
1. Cov qauv tshuaj lom neeg thiab kev npaj
HPMC yog cov khoom siv tshuaj lom neeg tau los ntawm kev sib xyaw ua ke ntawm cov cellulose ntuj thiab hydroxypropylating. Nws cov qauv muaj ob pawg ua haujlwm: ib qho yog methyl (-OCH₃) thiab lwm qhov yog hydroxypropyl (-OCH₂CHOHCH₃). Kev qhia txog ob pawg no ua rau HPMC yaj tau hauv dej, ua haujlwm ntawm qhov chaw, thiab muaj kev yaj sib txawv, viscosity thiab lwm yam ntxwv.
Cov pob txha cellulose-based tseem khaws cia rau hauv cov qauv molecular ntawm HPMC, uas yog cov polysaccharides ntuj thiab muaj biocompatibility zoo thiab biodegradability. Vim tias cov molecule muaj cov pab pawg ua haujlwm sib txawv, nws cov dej solubility, viscosity thiab stability tuaj yeem tswj tau raws li cov xwm txheej tshuaj tiv thaiv.
2. Kev yaj thiab viscosity
Ib qho tseem ceeb ntawm HPMC yog nws cov dej solubility zoo. HPMC nrog cov qhov hnyav molecular sib txawv thiab cov qib sib txawv ntawm kev hloov pauv muaj cov solubility thiab viscosity sib txawv. HPMC tuaj yeem yaj sai hauv dej txias los tsim cov tshuaj colloidal ruaj khov, thiab tsis cuam tshuam loj heev los ntawm qhov kub thiab pH ntawm dej.
Nyob ntawm hom thiab qib ntawm cov khoom hloov pauv, qhov viscosity ntawm HPMC tuaj yeem hloov kho tau ntau yam. Feem ntau hais lus, cov kua dej ntawm HPMC muaj qee qhov viscosity thiab tuaj yeem siv ua cov khoom tuab, nplaum thiab stabilizer. Qhov viscosity ntawm nws cov kua dej tuaj yeem tswj tau los ntawm kev hloov kho nws qhov hnyav molecular thiab qib ntawm kev hloov pauv, thiab qhov ntau ntawm viscosity yog los ntawm ntau pua txog ntau txhiab millipascals vib nas this (mPa s).
3. Kev ruaj khov ntawm cua sov
HPMC muaj kev ruaj khov zoo thaum tshav kub. Nyob rau hauv qhov kub siab, cov qauv tshuaj lom neeg thiab cov khoom siv lub cev ntawm HPMC tseem ruaj khov, thiab nws qhov chaw yaj feem ntau siab dua 200 ° C. Yog li ntawd, nws ua tau zoo hauv qee qhov kev siv uas xav tau qhov kub siab dua. Tshwj xeeb tshaj yog nyob rau hauv kev lag luam zaub mov thiab tshuaj, HPMC tuaj yeem tiv taus cov xwm txheej ib puag ncig hnyav thaum siv ua cov khoom siv tuab lossis cov khoom tso tawm tswj.
4. Lub zog kho tshuab thiab gelation
Cov tshuaj HPMC muaj lub zog siab thiab elasticity, thiab tuaj yeem tsim cov qauv gel hauv qee qhov xwm txheej. Hauv qee qhov kev siv hauv kev lag luam, HPMC feem ntau siv los tsim cov gels lossis zaj duab xis ruaj khov, tshwj xeeb tshaj yog hauv cov teb ntawm cov tshuaj, ntim khoom noj, tshuaj pleev ib ce, thiab lwm yam, rau kev tswj cov tshuaj tso tawm, thickening, stabilization thiab encapsulation ntawm cov khoom.
5. Kev sib haum xeeb thiab kev puas tsuaj ntawm cov khoom
Vim tias HPMC yog los ntawm cov cellulose ntuj, nws muaj kev sib raug zoo zoo, yuav luag tsis muaj biotoxicity, thiab tuaj yeem lwj sai hauv lub cev. Qhov no ua rau nws yog ib qho khoom siv feem ntau hauv kev lag luam tshuaj, tshwj xeeb tshaj yog rau cov tshuaj noj thiab cov tshuaj tswj kev tso tawm, uas tuaj yeem txhim kho kev siv tshuaj los ntawm kev tswj tus nqi tso tawm ntawm cov tshuaj.
6. Kev ua haujlwm ntawm qhov chaw
HPMC muaj qee yam kev ua haujlwm ntawm qhov chaw, uas tuaj yeem txo qhov nro ntawm qhov chaw ntawm cov tshuaj thiab txhim kho qhov kev sib kis thiab kev ntub dej ntawm cov kua. Nws yog qhov cwj pwm no uas ua rau HPMC siv dav hauv cov tshuaj pleev ib ce thiab cov khoom siv tu tus kheej, xws li cov khoom ua kom tuab, emulsifiers thiab stabilizers hauv cov tshuaj pleev ib ce, tshuaj pleev, tshuaj zawv plaub hau thiab lwm yam khoom.
7. Cov khoom tsis yog ionic
Tsis zoo li qee lwm cov polysaccharide derivatives ntuj, HPMC yog non-ionic. Nws tsis cuam tshuam nrog ions hauv cov tshuaj thiab yog li ntawd tsis cuam tshuam los ntawm kev hloov pauv ntawm electrolyte concentration. Qhov feature no ua rau HPMC muaj txiaj ntsig zoo hauv qee qhov kev siv tshwj xeeb hauv kev lag luam, tshwj xeeb tshaj yog thaum cov kua dej lossis colloids xav tau ruaj khov rau lub sijhawm ntev, HPMC tuaj yeem ua kom ruaj khov thiab sib xws.
8. Ntau yam kev siv
Cov yam ntxwv ntawm HPMC ua rau nws siv dav hauv ntau qhov chaw, feem ntau suav nrog cov hauv qab no:
Kev lag luam tshuaj: HPMC feem ntau siv ua lub plhaub tshuaj rau cov tshuaj, tus nqa khoom rau cov tshuaj tso tawm tas mus li, cov nplaum, cov khoom ua kom tuab, thiab lwm yam. Hauv kev npaj tshuaj, HPMC tuaj yeem tswj tau qhov kev tso tawm ntawm cov tshuaj thiab txhim kho kev siv tshuaj ntawm cov tshuaj.
Kev lag luam zaub mov: HPMC siv dav hauv cov dej haus, jellies, ice cream, kua ntses thiab lwm yam khoom noj ua cov khoom ua kom tuab, stabilizer, emulsifier thiab gelling hauv kev lag luam zaub mov, uas tuaj yeem txhim kho qhov saj thiab kev ntxhib los mos ntawm cov khoom.
Cov tshuaj pleev ib ce thiab cov khoom siv tu tus kheej: Hauv kev lag luam tshuaj pleev ib ce, HPMC siv rau hauv cov tshuaj pleev ib ce, lub ntsej muag lub ntsej muag, tshuaj zawv plaub hau, cov khoom tu tawv nqaij thiab lwm yam khoom los ua lub luag haujlwm ntawm kev ua kom tuab, kev ruaj khov, emulsification thiab lwm yam haujlwm.
Kev lag luam kev tsim kho: HPMC feem ntau siv ua cov khoom ua kom tuab thiab khaws dej hauv cov ntaub ntawv tsim kho. Cov ntawv thov feem ntau suav nrog cov cement mortar, cov nplaum pobzeb, thiab lwm yam, uas tuaj yeem txhim kho kev ua haujlwm ntawm kev tsim kho thiab kev ruaj khov ntawm cov khoom.
Kev Ua Liaj Ua Teb: HPMC kuj tseem siv tau ua tus stabilizer thiab thickener hauv cov tshuaj tua kab kom pab cov tshuaj faib sib npaug hauv av thiab txhim kho cov txiaj ntsig ntawm kev siv.
9. Kev tiv thaiv ib puag ncig thiab kev ruaj khov
Vim tias qhov tseem ceeb ntawm lub tshuabHPMClos ntawm cov cellulose ntuj thiab muaj kev puas tsuaj zoo rau lub cev, nws kuj muaj qee qhov zoo hauv kev tiv thaiv ib puag ncig. Ua ib qho polymer ntuj tsim uas ruaj khov, kev tsim khoom thiab kev siv HPMC yuav tsis ua rau muaj kev nyuaj siab ntau dhau rau ib puag ncig.
Hydroxypropyl methylcellulose (HPMC) muaj ntau yam khoom zoo heev, xws li kev yaj dej zoo, kev tswj viscosity, thermal stability, biocompatibility, thiab lwm yam. Nws yog siv dav hauv ntau yam lag luam xws li tshuaj, khoom noj, tshuaj pleev ib ce, thiab kev tsim kho. Nrog nws cov khoom tsis-ionic, cov khoom siv lub cev thiab tshuaj kho tau, thiab kev phooj ywg ib puag ncig, HPMC raug suav hais tias yog cov khoom siv polymer zoo heev. Hauv kev txhim kho kev lag luam thiab thev naus laus zis yav tom ntej, HPMC tseem muaj kev tshawb fawb thiab kev siv ntau yam.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-13-2024