Hydroxypropyl Methylcellulose Cov Khoom Siv Tshuaj

Soluble hauv dej thiab feem ntau polar c thiab tsim nyog sib piv ntawm ethanol / dej, propanol / dej, dichloroethane, thiab lwm yam, insoluble hauv ether, acetone, ethanol tsis meej, o hauv dej txias rau hauv cov ntshiab lossis turbid colloid kua. Cov kua aqueous muaj cov haujlwm saum npoo, siab pob tshab thiab ruaj khov kev ua haujlwm. Hydroxypropyl methylcellulose HPMC muaj cov khoom thermogel. Tom qab cov khoom tov aqueous yog rhuab, nws tsim cov gel, uas yog yaj tom qab txias. Cov gel kub ntawm qhov khoom sib txawv yog txawv. Solubility sib txawv nrog viscosity. Qhov qis dua viscosity, ntau dua cov solubility. Cov khoom ntawm cov sib txawv tshwj xeeb ntawm hydroxypropyl methylcellulose HPMC tau sib txawv. HPMC tsis cuam tshuam los ntawm pH hauv dej. Qhov loj me: 100 mesh kis tus nqi ntau dua 98.5%. Kev ceev ntau: 0.25-0.70g / (feem ntau 0.4g / los yog li ntawd), lub zog nqus tshwj xeeb 1.26-1.31. Kev hloov xim kub: 180-200 ° C, carbonation kub: 280-300 ° C. Tus nqi methoxy yog 19.0% rau 30.0%, thiab tus nqi hydroxypropyl yog 4% rau 12%. Cov Viscosity (22 ° C, 2%) 5 ~ 200000 mPa .s. Gel kub (0.2%) 50 txog 90 ° C. HPMC muaj cov peev txheej loj, ntsev tawm, pH ruaj khov, dej tuav, ruaj khov qhov ntev, qhov zoo tshaj plaws zaj duab xis tsim thiab ntau hom enzyme tsis kam, dispersibility thiab adhesion.