Puas muaj peev xwm sib xyaw HPMC thiab CMC
Methyl celluloseyog dawb los yog dawb zoo li cov hmoov fibrous lossis granular; Tsis muaj ntxhiab, tsis qab. Cov khoom no hauv dej o tuaj rau hauv cov kua colloidal meej lossis me ntsis turbid; Insoluble hauv ethanol, chloroform lossis diethyl ether. Nws sai sai dispersed thiab o hauv dej kub ntawm 80-90 ℃, thiab sai sai yaj tom qab txias. Cov kua aqueous ruaj khov heev ntawm chav tsev kub, thiab tuaj yeem gel ntawm qhov kub siab, thiab cov gel tuaj yeem hloov pauv nrog cov kua nrog qhov kub.
Nws muaj qhov zoo heev ntawm kev ntub dej, kev sib kis, kev nplaum, kev tuab, kev emulsification, kev khaws cia dej thiab kev tsim zaj duab xis, nrog rau kev tsis muaj roj. Zaj duab xis muaj kev tawv zoo heev, kev ywj pheej thiab pob tshab. Vim tias nws tsis yog ionic, nws tuaj yeem sib xws nrog lwm cov emulsifiers, tab sis nws yooj yim rau ntsev tawm, thiab cov tshuaj ruaj khov hauv qhov ntau ntawm PH2 - 12. Sodium carboxymethyl cellulose Cov khoom no yog ntsev sodium ntawm cellulose carboxymethyl ether, koom nrog anionic cellulose ether, yog dawb lossis mis nyuj dawb fibrous hmoov lossis khoom me me, qhov ceev 0.5-0.7 g / cubic centimeter, yuav luag tsis muaj ntxhiab, tsis muaj saj, hygroscopic. Yooj yim rau disperse hauv dej rau hauv cov kua gelatinous pob tshab, insoluble hauv ethanol thiab lwm yam organic solvents.
Thaum lub pH ntawm cov kua dej yog 6.5 - 8.5, qhov viscosity ntawm cov slurry txo qis thaum lub pH yog >10 lossis <5, thiab qhov kev ua tau zoo tshaj plaws thaum lub pH yog 7. Rau kev ruaj khov thermal, qhov viscosity nce sai hauv qab 20 ℃, hloov qeeb ntawm 45 ℃, thiab colloid denaturation thiab viscosity thiab cov khoom txo qis thaum cua sov rau lub sijhawm ntev tshaj 80 ℃. Yooj yim soluble hauv dej, kua pob tshab; Nws ruaj khov heev hauv alkaline kua, thiab yooj yim rau hydrolyze hauv cov kua qaub. Thaum lub pH tus nqi yog 2-3, nag yuav tshwm sim, thiab nag kuj yuav tshwm sim hauv cov ntsev hlau ntau yam. Hydroxypropyl methyl cellulose, tseem hu ua hydroxypropyl methyl cellulose, cellulose hydroxypropyl methyl ether, yog kev xaiv ntawm cov paj rwb ntshiab heev ua cov khoom siv raw, nyob rau hauv alkaline mob los ntawm kev tshwj xeeb etherification thiab kev npaj.
Yaj hauv dej thiab feem ntau polar C thiab qhov sib piv ntawm ethanol/dej, propanol/dej, dichloroethane, thiab lwm yam, tsis yaj hauv diethyl ether, acetone, ethanol kiag li, thiab o hauv dej txias ua kua colloidal meej lossis me ntsis turbidized. Cov kua aqueous muaj kev ua haujlwm ntawm qhov chaw, pob tshab siab thiab ruaj khov.HPMCmuaj cov khoom zoo li cov gel kub. Tom qab cua sov, cov khoom aqueous kua tsim cov gel precipitation, thiab tom qab ntawd yaj tom qab txias. Qhov kub ntawm cov gel ntawm cov lus qhia sib txawv yog txawv.
Lub sijhawm tshaj tawm: Plaub Hlis-25-2024