Cov khoom tseem ceeb tshawb nrhiav thiab cov txheej txheem txheem
Kev tshawb pom ntawm methylcellulose feem ntau suav nrog kev txiav txim siab ntawm viscosity, methoxyl cov ntsiab lus, pH, poob ntawm ziab, residue ntawm ignition, hnyav hlau, thiab arsenic ntsev. Kev txiav txim siab viscosity yuav tsum yog raws li cov qauv tshuaj pharmacopoeia. Rau cov qauv nrog cov ntawv sau viscosity qis dua 600 mPa·s, txoj kev capillary viscometer yuav tsum tau siv, thiab viscosity yuav tsum yog 80% -120% ntawm cov ntawv sau viscosity. Rau cov qauv nrog cov ntawv sau viscosity tsis tsawg dua 600 mPa·s, yuav tsum siv txoj kev tig viscometer, thiab viscosity yuav tsum yog 75% -140% ntawm cov ntawv sau viscosity. Kev txiav txim siab cov ntsiab lus methoxyl yuav tsum ua raws li txoj kev txiav txim siab methoxyl thiab tuaj yeem ua tau siv roj chromatography lossis titration. Lwm yam kev ntsuam xyuas niaj hnub suav nrog pH, poob ntawm qhov ziab, qhov seem ntawm qhov hluav taws kub, cov hlau hnyav, thiab cov ntsev arsenic.
Rau kev kuaj pH, kev daws teeb meem los ntawm ntu viscosity yuav tsum tau sim raws li txoj kev tau piav qhia saum toj no. Tus nqi pH yuav tsum yog 5.0-8.0. Poob ntawm kev ntsuas kom qhuav: ziab cov khoom ntawm 105℃rau 1 teev; qhov hnyav poob yuav tsum tsis pub tshaj 5.0%. Residue ntawm ignition test: Test 1.0g ntawm cov khoom raws li txoj kev; cov residue yuav tsum tsis pub tshaj 1.0%. Hnyav hlau kuaj: Kuaj cov seem seem nyob rau hauv qhov seem ntawm qhov ntsuas hluav taws xob raws li txoj kev; cov ntsiab lus hlau hnyav yuav tsum tsis pub tshaj 20 feem ntawm ib lab. Kev kuaj arsenic: Siv 1.0g ntawm cov khoom, ntxiv 1.0g ntawm calcium hydroxide, sib tov, ignite, thiab kuaj raws li txoj kev; nws yuav tsum ua tau raws li qhov yuav tsum tau ua.
Lwm yam khoom siv kuaj thiab ntsuas
Tsis tas li ntawd, cov khoom kuaj muaj xws li cov ntsiab lus noo noo, purity tsom xam, thiab particle loj faib. Cov cuab yeej kuaj siv feem ntau suav nrog siab -kev ua haujlwm ua kua chromatography (HPLC), infrared spectroscopy, thiab particle loj analyzer.
Frontier xeem technologies thiab kev tshawb fawb
Hais txog kev tshawb fawb thev naus laus zis, Shandong Tiansheng Cellulose Co., Ltd. tau thov rau patent thaum Lub Kaum Hli 2024 rau "Ib txoj hauv kev los kuaj xyuas cov ntsiab lus cellulose hauv methylcellulose cov dej khib nyiab." Ob -dimensional correlation infrared spectroscopy can be used to characterize its dissolution mechanism in ionic liquids.
