Yuav ua li cas thiaj nrhiav tau cov tshauv ntawm hydroxypropyl methylcellulose?

Cov ntsiab lus ntawm cov tshauv yog ib qho cim qhia tseem ceeb ntawmhydroxypropyl methylcellulose. Ntau tus neeg siv khoom feem ntau nug thaum lawv nkag siab txog hydroxypropyl methylcellulose: tus nqi tshauv yog dab tsi? Hydroxypropyl methylcellulose nrog cov tshauv me me txhais tau tias muaj kev huv siab dua; cellulose nrog cov tshauv loj txhais tau tias muaj ntau yam tsis huv hauv nws, uas yuav cuam tshuam rau kev siv cov txiaj ntsig lossis nce qhov ntxiv. Thaum cov neeg siv khoom xaiv hydroxypropyl methylcellulose, lawv feem ntau ncaj qha rau qee cov cellulose nrog hluav taws thiab hlawv nws los sim cov tshauv ntawm cov cellulose. Tab sis txoj kev kuaj pom no tsis muaj kev tshawb fawb, vim tias ntau tus neeg tsim khoom ntxiv cov khoom siv hluav taws xob rau cov cellulose. Ntawm qhov chaw, cov cellulose muaj tshauv me me tom qab hlawv, tab sis hauv kev xyaum, kev khaws dej ntawm hydroxypropyl methylcellulose tsis zoo heev.

Yog li peb yuav tsum ua li cas thiaj nrhiav tau cov tshauv hauv hydroxypropyl methylcellulose? Txoj kev nrhiav kom raug yog siv lub tshuab cua sov muffle los nrhiav.

Kev ntsuas qhov sib npaug ntawm cov cuab yeej ntsuas, lub cub tawg kub siab, lub cub tawg hluav taws xob.

Cov txheej txheem sim:

1) Ua ntej, muab 30ml porcelain crucible tso rau hauv lub cub tawg kub thiab hlawv nws ntawm (500 ~ 600) ° C rau 30 feeb, kaw lub qhov rooj cub kom txo qhov kub hauv lub cub tawg kom qis dua 200 ° C, tom qab ntawd tshem tawm lub crucible thiab txav mus rau lub desiccator kom txias (20 ~ 30) feeb, ntsuas qhov hnyav.

2) Hnyav 1.0 g ntawmhydroxypropyl methylcelluloseSiv lub ntsuas ntsuas, muab cov qauv uas hnyav rau hauv lub crucible, ces muab lub crucible uas muaj cov qauv tso rau ntawm lub cub hluav taws xob rau carbonization, txias rau qhov kub thiab txias hauv chav, ntxiv sulfuric acid (0.5-1.0) ml, thiab muab tso rau ntawm lub cub hluav taws xob rau carbonization tag nrho. Tom qab ntawd txav mus rau lub cub hluav taws xob kub, hlawv ntawm (500 ~ 600) ℃ rau 1 teev, tua lub zog ntawm lub cub hluav taws xob kub, thaum qhov kub ntawm lub cub hluav taws xob poob qis dua 200 ℃, coj nws tawm thiab muab tso rau hauv lub desiccator kom txias (20 ~ 30) feeb, thiab tom qab ntawd hnyav rau ntawm lub ntsuas ntsuas.

Kev suav cov khoom seem uas raug hlawv yog suav raws li tus qauv (3):

m2-m1

Cov khoom seem uas tseem tshuav thaum hluav taws kub (%) = ×100…………………………(3)

m

Hauv cov mis: m1 - qhov hnyav ntawm lub crucible khoob, hauv g;

m2 - qhov hnyav ntawm cov seem thiab crucible, hauv g;

m - qhov hnyav ntawm cov qauv, hauv g.