Qhia:
Hydroxypropylencellulose (HPMC) thiab hydroxyethylcelleculose (HEC) yog ob qho tib si siv ntxiv rau hauv cov zaub mov, kev lag luam kom zoo nkauj thiab tshuaj lom neeg. Cov cellulose derivatives muaj kev cia siab thov cov kev cia siab vim lawv cov dej solubility, txo qis thiab ua yeeb yaj kiab zoo heev.
1. Dememical qauv:
HPMC yog cov khoom siv hluavtaws tuaj los ntawm cellulose. Nws yog tsim los ntawm kev hloov kho lub cev hloov kho cov cellulose los ntawm kev ntxiv cov tshuaj pleev cov roj pleev thiab methyl chloride. HEC kuj yog ib hom cellulose derivative, tab sis nws yog tsim los ntawm kev rov qab ntuj cellulose nrog ethylene oxide thiab tom qab ntawd kho nws nrog alkali.
2. Solubility:
Ob tus HECC thiab HEC yog cov dej-soluble thiab tuaj yeem yaj hauv dej txias. Tab sis cov solubility ntawm HEC yog qis dua HPMC. Qhov no txhais tau tias HPMC muaj kev sib cais zoo dua thiab tuaj yeem siv ntau dua hauv cov qauv.
3. Viscosity:
HPMC thiab HEC muaj cov hom phiaj viscosity txawv vim yog lawv cov qauv tshuaj. HEC muaj qhov hnyav dua molecular hnyav thiab cov qauv denser dua HPMC, uas muab rau nws ntau dua viscosity. Yog li ntawd, HEC feem ntau siv los ua cov tuab tuab uas xav tau cov viscosity high viscosity, thaum HPMC yog siv nyob rau hauv cov kev uas xav tau qis viscosity.
4. Zaj duab xis-ua kev ua tau zoo:
MPMC thiab HECCC thiab HEC muaj cov ua yeeb yaj kiab zoo heev. Tab sis HPMC muaj cov yeeb yaj kiab qis dua-ua kom sov, uas txhais tau tias nws tuaj yeem siv tau ntawm qis dua qhov kub. Qhov no ua rau HPMC ntau tsim nyog rau siv nyob rau hauv cov qauv uas yuav tsum tau ua kom nrawm dua qhuav lub sij hawm thiab zoo dua adhesion.
5. Stability:
HPMC thiab HEC tau ruaj khov nyob rau hauv feem ntau cov kev mob siab. Txawm li cas los xij, HEC yog qhov rhiab ntau rau HPMC. Qhov no txhais tau tias HEC yuav tsum tau siv nyob rau hauv cov qauv nrog cov photes nrog cov photes 5 txog 10, thaum HPMC tuaj yeem siv rau hauv cov kab dav dav.
6. Daim ntawv thov:
Cov yam ntxwv sib txawv ntawm HPMC thiab HEC ua rau lawv haum rau cov ntawv thov sib txawv. Hec yog feem ntau siv los ua tus neeg sawv cev tuab ntawm cov tshuaj pleev ib ce thiab tshuaj. Nws kuj yog siv los ua phau ntawv binder thiab ua yeeb yaj kiab-sib sau tus neeg sawv cev hauv cov ntsiav tshuaj ua qauv. HPMC yog siv los ua cov tuab yaj ntaub, stabilizer, thiab zaj duab xis-ua tus neeg sawv cev hauv cov zaub mov, tshuaj yeeb. Nws tseem raug siv los ua tus sawv cev ntawm cov khoom noj hauv qee cov ntawv thov cov khoom noj.
Hauv kev xaus:
HPMC thiab HEC yog ob lub cellulose derivatives nrog cov khoom ntiag tug haum rau kev siv cov ntawv thov sib txawv. Nkag siab txog qhov sib txawv ntawm ob qho ntxiv no tuaj yeem pab koj xaiv qhov yog rau koj daim ntawv qhia. Zuag qhia tag nrho, HPMC thiab HEC muaj kev nyab xeeb thiab siv tau zoo thiab muaj txiaj ntsig rau cov zaub mov, kev lag luam kom zoo nkauj thiab tshuaj lom.
Lub sijhawm Post: Sep-13-2023