Qhia:
Hydroxypropylmethylcellulose (HPMC) thiab hydroxyethylcellulose (HEC) yog ob qho tib si siv tshuaj ntxiv hauv cov zaub mov, tshuaj pleev ib ce thiab tshuaj lag luam. Cov cellulose derivatives no muaj dav daim ntawv thov kev cia siab vim lawv cov dej solubility tshwj xeeb, thickening stability, thiab zoo heev film-forming peev xwm.
1. Cov qauv tshuaj:
HPMC yog ib qho hluavtaws polymer muab los ntawm cellulose. Nws yog tsim los ntawm kev hloov kho ntuj cellulose los ntawm kev ntxiv propylene oxide thiab methyl chloride. HEC kuj yog ib hom cellulose derivative, tab sis nws yog tsim los ntawm reacting natural cellulose nrog ethylene oxide thiab ces kho nws nrog alkali.
2. Solubility:
HPMC thiab HEC yog dej-soluble thiab tuaj yeem yaj hauv dej txias. Tab sis qhov solubility ntawm HEC qis dua HPMC. Qhov no txhais tau tias HPMC muaj qhov sib txawv zoo dua thiab tuaj yeem siv tau yooj yim dua hauv cov qauv.
3. Viscosity:
HPMC thiab HEC muaj cov viscosity sib txawv vim lawv cov qauv tshuaj. HEC muaj qhov hnyav dua molecular thiab cov qauv denser dua li HPMC, uas ua rau nws muaj viscosity ntau dua. Yog li, HEC feem ntau yog siv los ua cov thickener hauv cov qauv uas yuav tsum tau muaj viscosity siab, thaum HPMC yog siv rau hauv cov qauv uas xav tau qis dua viscosity.
4. Film-forming kev ua tau zoo:
HPMC thiab HEC muaj peev xwm ua tau zoo heev. Tab sis HPMC muaj qhov kub ntawm zaj duab xis-tsim, uas txhais tau hais tias nws tuaj yeem siv rau qhov kub thiab txias. Qhov no ua rau HPMC tsim nyog rau kev siv hauv cov qauv uas xav tau lub sij hawm ziab sai dua thiab ua kom zoo dua.
5. Kev ruaj ntseg:
HPMC thiab HEC yog ruaj khov nyob rau hauv feem ntau pH thiab kub tej yam kev mob. Txawm li cas los xij, HEC yog qhov nkag siab zoo rau pH hloov dua li HPMC. Qhov no txhais tau hais tias HEC yuav tsum tau siv nyob rau hauv formulations nrog ib tug pH ntau ntawm 5 mus rau 10, thaum HPMC yuav siv tau nyob rau hauv ib tug dav pH ntau.
6. Daim ntawv thov:
Cov yam ntxwv sib txawv ntawm HPMC thiab HEC ua rau lawv haum rau kev siv sib txawv. HEC feem ntau yog siv los ua cov thickening tus neeg sawv cev hauv cov tshuaj pleev ib ce thiab tshuaj formulations. Nws kuj yog siv los ua ib qho kev sib khi thiab zaj duab xis-tsim tus neeg sawv cev hauv cov ntsiav tshuaj formulations. HPMC yog siv los ua thickener, stabilizer, thiab zaj duab xis-tsim tus neeg sawv cev hauv cov zaub mov, tshuaj, thiab tshuaj pleev ib ce. Nws kuj yog siv los ua tus neeg sawv cev gelling hauv qee daim ntawv thov zaub mov.
Hauv kev xaus:
HPMC thiab HEC yog ob qho tib si cellulose derivatives nrog cov khoom tshwj xeeb tsim nyog rau kev siv sib txawv. Kev nkag siab qhov sib txawv ntawm ob qho tshuaj ntxiv no tuaj yeem pab koj xaiv qhov zoo rau koj daim ntawv qhia. Zuag qhia tag nrho, HPMC thiab HEC muaj kev nyab xeeb thiab muaj txiaj ntsig zoo ntxiv uas muaj ntau yam txiaj ntsig rau cov zaub mov, tshuaj pleev ib ce thiab tshuaj lag luam.
Post lub sij hawm: Sep-13-2023