Hydroxypropyl methylcellulose (HPMC) yog ib qho nonionic cellulose ether dav siv nyob rau hauv ntau yam kev lag luam thiab kev siv tshuaj. Nws lub luag haujlwm tseem ceeb suav nrog thickener, zaj duab xis qub, stabilizer, emulsifier, suspending agent thiab nplaum. HPMC yog dav siv hauv tshuaj, tshuaj pleev ib ce, khoom noj khoom haus, khoom siv hauv tsev thiab lwm yam lag luam. Nws txoj kev siv nyob ntawm qhov tshwj xeeb ntawm daim ntawv thov, qhov yuav tsum tau ua haujlwm zoo, lwm cov khoom xyaw ntawm cov qauv thiab cov kev cai tshwj xeeb.
1. Pharmaceutical teb
Hauv kev npaj tshuaj, HPMC feem ntau yog siv los ua tus neeg sawv cev tso tawm, txheej txheej, zaj duab xis qub thiab cov tshuaj ntsiav tshuaj. Hauv cov ntsiav tshuaj, kev siv HPMC feem ntau yog nruab nrab ntawm 2% thiab 5% ntawm tag nrho qhov hnyav los tswj qhov tso tawm ntawm cov tshuaj. Rau kev tso tawm cov ntsiav tshuaj, qhov kev siv yuav siab dua, txawm tias mus txog 20% lossis ntau dua, kom ntseeg tau tias cov tshuaj tuaj yeem maj mam tso tawm rau lub sijhawm ntev. Raws li cov khoom siv txheej txheej, kev siv HPMC feem ntau yog nruab nrab ntawm 3% thiab 8%, nyob ntawm seb qhov yuav tsum tau ua cov txheej thickness thiab kev ua haujlwm.
2. Kev lag luam zaub mov
Hauv kev lag luam khoom noj khoom haus, HPMC feem ntau yog siv los ua cov thickener, emulsifier, suspending agent, thiab lwm yam. Nws yog siv los ua cov rog hloov hauv cov zaub mov uas tsis muaj calorie ntau vim nws tuaj yeem muab cov roj zoo li saj thiab cov qauv. Tus nqi siv nyob rau hauv cov zaub mov feem ntau yog nruab nrab ntawm 0.5% thiab 3%, nyob ntawm seb hom thiab formulation ntawm cov khoom. Piv txwv li, hauv dej haus, kua ntses los yog cov khoom noj siv mis, tus nqi ntawm HPMC siv feem ntau yog qis, li ntawm 0.1% mus rau 1%. Hauv qee cov khoom noj uas yuav tsum tau nce viscosity lossis txhim kho kev ntxhib los mos, xws li cov noodles tam sim lossis cov khoom ci, tus nqi ntawm HPMC siv yuav siab dua, feem ntau ntawm 1% thiab 3%.
3. Kho kom zoo nkauj teb
Hauv cov tshuaj pleev ib ce, HPMC yog dav siv los ua cov thickener, stabilizer thiab zaj duab xis yav dhau los hauv cov tshuaj pleev ib ce, tshuaj zawv plaub hau, tshuaj pleev qhov muag thiab lwm yam khoom. Nws qhov ntau npaum li cas feem ntau yog 0.1% mus rau 2%, nyob ntawm qhov xav tau viscosity ntawm cov khoom thiab cov yam ntxwv ntawm lwm cov khoom xyaw. Hauv qee cov tshuaj pleev ib ce, xws li cov khoom tu tawv nqaij lossis cov tshuaj pleev thaiv hnub uas xav tau los ua ib zaj duab xis, tus nqi ntawm HPMC siv yuav ntau dua los xyuas kom meej tias cov khoom tsim cov txheej txheem tiv thaiv ntawm daim tawv nqaij.
4. Cov khoom siv hauv tsev
Hauv cov khoom siv hauv tsev, HPMC tau siv dav hauv cov khoom xws li cov cement, gypsum khoom, latex xim thiab pobzeb adhesives los txhim kho kev tsim kho ntawm cov ntaub ntawv, ncua lub sijhawm qhib, thiab txhim kho kev tiv thaiv sagging thiab tiv thaiv kev tawg. Tus nqi ntawm HPMC siv hauv cov khoom siv hauv tsev feem ntau yog nyob nruab nrab ntawm 0.1% thiab 1%, nyob ntawm qhov yuav tsum tau ua ntawm kev tsim. Rau cov cement mortar lossis gypsum cov ntaub ntawv, tus nqi ntawm HPMC feem ntau yog 0.2% mus rau 0.5% los xyuas kom meej tias cov khoom muaj kev tsim kho zoo thiab rheology. Hauv cov xim latex, tus nqi ntawm HPMC feem ntau yog 0.3% rau 1%.
5. Cov kev cai thiab cov qauv
Ntau lub teb chaws thiab cheeb tsam muaj cov kev cai sib txawv thiab cov qauv rau kev siv HPMC. Hauv kev ua zaub mov thiab tshuaj, kev siv HPMC yuav tsum ua raws li cov kev cai ntawm cov cai. Piv txwv li, hauv EU thiab Tebchaws Meskas, HPMC tau lees paub dav dav tias muaj kev nyab xeeb (GRAS), tab sis nws txoj kev siv tseem yuav tsum tau tswj raws li cov khoom lag luam tshwj xeeb thiab kev siv. Hauv kev tsim kho thiab tshuaj pleev ib ce, txawm hais tias kev siv HPMC tsis tshua muaj kev txwv ncaj qha, qhov cuam tshuam rau ib puag ncig, kev nyab xeeb ntawm cov khoom thiab kev noj qab haus huv ntawm cov neeg siv khoom tseem yuav tsum tau xav txog.
Tsis muaj tus qauv ruaj khov rau tus nqi ntawm HPMC siv. Nws yog nyob ntawm qhov tshwj xeeb daim ntawv thov scenario, qhov yuav tsum tau muaj kev ua haujlwm zoo, thiab kev sib koom tes ntawm lwm cov khoom xyaw. Feem ntau hais lus, tus nqi ntawm HPMC siv li ntawm 0.1% txog 20%, thiab tus nqi tshwj xeeb yuav tsum tau hloov kho raws li kev tsim qauv thiab kev tswj hwm. Hauv kev siv tiag tiag, R & D cov neeg ua haujlwm feem ntau hloov kho raws li kev sim cov ntaub ntawv thiab kev paub dhau los kom ua tiav cov txiaj ntsig zoo tshaj plaws thiab siv tau zoo. Nyob rau tib lub sijhawm, kev siv HPMC yuav tsum ua raws li cov qauv kev lag luam thiab cov cai tswj xyuas kom muaj kev nyab xeeb thiab ua raws li cov khoom lag luam.
Post lub sij hawm: Aug-19-2024