Yuav ua li cas txhawm rau txheeb xyuas cov hmoov tshauv ntawm hydroxypropyl methylcellulose?

Cov ntsiab lus tshauv yog ib qho tseem ceeb qhia txogHydroxypropyl methylcellulose yog ib qho khoom siv zoo. 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 hmoov tshauv me me txhais tau tias ntau dua purity; cellulose nrog cov hmoov tshauv loj txhais tau hais tias muaj ntau yam impurities nyob rau hauv nws, uas yuav cuam tshuam rau kev siv cov nyhuv los yog nce tus nqi ntxiv. Thaum cov neeg siv khoom xaiv hydroxypropyl methylcellulose, lawv feem ntau ncaj qha rau qee qhov cellulose nrog hluav taws thiab hlawv nws los ntsuas cov hmoov tshauv ntawm cov cellulose. Tab sis txoj kev tshawb nrhiav no yog qhov tsis txaus ntseeg, vim tias ntau tus neeg tsim khoom ntxiv cov tshuaj tua kab mob rau cov cellulose. Nyob rau saum npoo, cov cellulose muaj cov tshauv tsawg heev tom qab hlawv, tab sis hauv kev xyaum, cov dej tuav ntawm hydroxypropyl methylcellulose tsis zoo heev.

Yog li cas peb yuav tsum raug kuaj xyuas cov hmoov tshauv ntawm hydroxypropyl methylcellulose? Txoj kev tshawb nrhiav kom raug yog siv lub qhov cub muffle los ntes.

Ntsuas ntsuas qhov sib npaug, qhov kub thiab txias muffle rauv, hluav taws xob rauv.

Cov txheej txheem sim:

1) Ua ntej, muab 30ml porcelain crucible rau hauv lub qhov cub kub kub thiab kub hnyiab ntawm (500 ~ 600) ° C rau 30 feeb, kaw lub qhov cub kom txo qhov kub hauv qhov cub kom qis dua 200 ° C, ces muab tawm lub crucible thiab txav mus rau lub desiccator kom txias (20 ~ 30) min, hnyav.

2) Nyhav 1.0 gHydroxypropyl methylcellulose yog ib qho khoom siv zooNyob rau hauv ib qho kev ntsuas ntsuas, muab cov qauv hnyav rau hauv lub crucible, tom qab ntawd muab lub crucible uas muaj cov qauv ntawm lub cub hluav taws xob rau carbonization, txias rau chav tsev kub, ntxiv sulfuric acid (0.5-1.0) ml, thiab muab tso rau hauv lub cub hluav taws xob. ua kom tiav carbonization. Tom qab ntawd txav mus rau qhov kub kub muffle rauv, hlawv ntawm (500 ~ 600) ℃ rau 1 teev, tua lub hwj chim ntawm qhov kub siab muffle rauv, thaum lub cub tawg kub poob qis dua 200 ℃, tshem tawm thiab muab tso rau hauv lub desiccator. kom txias (20 ~ 30) min, thiab tom qab ntawd ntsuas qhov ntsuas qhov ntsuas.

Kev suav Ignition residue yog xam raws li formula (3):

m2m 1

Ignition residue (%) = × 100…………………………(3)

m

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

m2 - loj ntawm residue thiab crucible, hauv g;

m - qhov loj ntawm cov qauv, hauv g.