Yuav HPMC thiab CMC sib tov
Methyl cellulose yog dawb los yog dawb zoo li fibrous los yog granular hmoov;Tsis hnov tsw, tsw.Cov khoom no nyob rau hauv dej o mus rau hauv ib tug ntshiab los yog me ntsis turbid colloidal tov;Insoluble nyob rau hauv kiag li ethanol, chloroform los yog diethyl ether.Nws tau tawg sai sai thiab o hauv dej kub ntawm 80-90 ℃, thiab sai sai yaj tom qab txias.Cov tshuaj aqueous yog qhov ruaj khov ntawm chav tsev kub, thiab tuaj yeem gel ntawm qhov kub thiab txias, thiab cov gel tuaj yeem hloov nrog cov tshuaj nrog qhov kub thiab txias.
Nws muaj zoo wettability, dispersion, adhesion, thickening, emulsification, dej tuav thiab zaj duab xis tsim, nrog rau cov roj impermeability.Zaj duab xis muaj zoo heev toughness, yooj thiab pob tshab.Vim tias nws tsis yog-ionic, nws tuaj yeem sib xyaw nrog lwm cov emulsifiers, tab sis nws yooj yim kom ntsev tawm, thiab cov tshuaj yog ruaj khov nyob rau hauv qhov ntau ntawm PH2 - 12. Sodium carboxymethyl cellulose Cov khoom no yog sodium ntsev ntawm cellulose carboxymethyl ether, belongs rau anionic cellulose ether, yog dawb los yog milky dawb fibrous hmoov los yog particle, ceev 0.5-0.7 g / cubic centimeter, yuav luag odorless, tasteless, hygroscopic.Yooj yim rau disperse hauv dej rau hauv pob tshab gelatinous tov, insoluble nyob rau hauv ethanol thiab lwm yam organic solvents.
Thaum pH ntawm cov kua aqueous yog 6.5 - 8.5, viscosity ntawm slurry txo qis thaum pH yog> 10 lossis <5, thiab qhov kev ua tau zoo yog qhov zoo tshaj plaws thaum pH yog 7. Rau thermal stability, viscosity nce sai hauv qab no. 20 ℃, hloov maj mam ntawm 45 ℃, thiab cov colloid denaturation thiab viscosity thiab cov khoom txo qis heev thaum rhuab mus ntev tshaj 80 ℃.Yooj yim soluble hauv dej, pob tshab kua;Nws yog ruaj khov heev nyob rau hauv alkaline tov, thiab yooj yim rau hydrolyze nyob rau hauv cov ntaub ntawv ntawm acid.Thaum tus nqi pH yog 2-3, nag lossis daus yuav tshwm sim, thiab nag lossis daus kuj yuav tshwm sim nyob rau hauv rooj plaub ntawm ntau cov ntsev ntsev.Hydroxypropyl methyl cellulose, tseem hu ua hydroxypropyl methyl cellulose, cellulose hydroxypropyl methyl ether, yog xaiv cov paj rwb ntshiab heev cellulose ua raw khoom, nyob rau hauv alkaline tej yam kev mob los ntawm tshwj xeeb etherification thiab npaj.
Soluble nyob rau hauv dej thiab feem ntau polar C thiab tsim nyog feem ntawm ethanol / dej, propanol / dej, dichloroethane, thiab lwm yam., insoluble nyob rau hauv diethyl ether, acetone, kiag li ethanol, o nyob rau hauv dej txias rau hauv ib tug ntshiab los yog me ntsis turbidized colloidal tov.Cov tshuaj aqueous muaj cov dej num saum npoo av, siab pob tshab thiab kev ua haujlwm ruaj khov.HPMC muaj cov khoom siv kub gel.Tom qab cua sov, cov khoom aqueous tov ua gel nag lossis daus, thiab tom qab ntawd yaj tom qab txias.Cov gel kub ntawm qhov sib txawv specifications txawv.
Post lub sij hawm: Sep-09-2022