Kodi mungazindikire bwanji phulusa la hydroxypropyl methylcellulose?

Phulusa zili ndi chizindikiro chofunikira chahydroxypropyl methylcellulose. Makasitomala ambiri amafunsa akamvetsetsa hydroxypropyl methylcellulose: mtengo wake ndi wotani? Hydroxypropyl methylcellulose yokhala ndi phulusa laling'ono limatanthawuza kuyera kwambiri; mapadi okhala ndi phulusa lalikulu amatanthauza kuti pali zonyansa zambiri mmenemo, zomwe zingakhudze zotsatira zogwiritsira ntchito kapena kuwonjezera kuchuluka kwa kuwonjezera. Makasitomala akasankha hydroxypropyl methylcellulose, nthawi zambiri amayatsa cellulose mwachindunji ndikuwotcha kuti ayese phulusa la cellulose. Koma njira yodziwira iyi ndi yosagwirizana ndi sayansi, chifukwa opanga ambiri amawonjezera ma accelerants oyaka ku cellulose. Pamwamba, cellulose imakhala ndi phulusa lochepa kwambiri pambuyo poyaka, koma pochita, kusunga madzi kwa hydroxypropyl methylcellulose sikwabwino kwambiri.

Ndiye tiyenera kuzindikira bwanji phulusa la hydroxypropyl methylcellulose? Njira yolondola yodziwira ndiyo kugwiritsa ntchito ng'anjo ya muffle kuti muzindikire.

Instrument Analytical balance, kutentha kwakukulu kwa ng'anjo yamoto, ng'anjo yamagetsi.

Njira yoyesera:

1) Choyamba, ikani 30ml porcelain crucible mu ng'anjo yamoto yotentha kwambiri ndikuwotcha pa (500 ~ 600) ° C kwa mphindi 30, kutseka chipata cha ng'anjo kuti muchepetse kutentha kwa ng'anjo mpaka pansi pa 200 ° C, kenako tengani. Tulutsani crucible ndikusunthira ku desiccator kuti izizirike (20 ~ 30) min, yolemera.

2) Kulemera kwa 1.0 ghydroxypropyl methylcellulosepa analytical balance, ikani chitsanzo choyezera mu crucible, ndiye ikani crucible munali chitsanzo pa ng'anjo yamagetsi ya carbonization, ozizira kutentha firiji, kuwonjezera sulfuric acid (0.5-1.0) ml, ndi kuika pa ng'anjo yamagetsi kwa wathunthu carbonization. Kenako pita ku ng'anjo yotentha kwambiri, kutentha kwa (500 ~ 600) ℃ kwa ola limodzi, zimitsani ng'anjo yotentha kwambiri, kutentha kwa ng'anjo kumatsika pansi pa 200 ℃, tulutsani ndikuyiyika mu desiccator. kuziziritsa (20 ~ 30) min, ndiyeno kuyeza pamlingo wowunikira.

Kuwerengera Kuwotcha zotsalira kumawerengedwa molingana ndi formula (3):

m2-m1

Zotsalira pa kuyatsa (%) = × 100……………………………(3)

m

Mu chilinganizo: m1 - kulemera kwa crucible chopanda kanthu, mu g;

m2 - kuchuluka kwa zotsalira ndi crucible, mu g;

m - kulemera kwa chitsanzo, mu g.