1. Cov tsos:
Visually soj ntsuam nyob rau hauv lub ntuj tawg tawg.
2. Viscosity:
Ntsuas 400 ml high-stirring beaker, hnyav 294 g dej rau hauv nws, tig rau lub tov khoom, thiab tom qab ntawd ntxiv 6.0 g ntawm qhov hnyav cellulose ether; do tsis tu ncua kom txog thaum nws yaj tag, thiab ua 2% tov; Tom qab 3-4 teev ntawm qhov ntsuas kub (20 ± 2) ℃; siv NDJ-1 rotary viscometer los kuaj, thiab xaiv qhov tsim nyog viscometer rotor naj npawb thiab rotor ceev thaum kuaj. Tig lub rotor thiab muab tso rau hauv cov tshuaj thiab cia nws sawv ntsug li 3-5 feeb; tig rau ntawm qhov hloov thiab tos kom tus nqi kom ruaj khov, thiab sau cov txiaj ntsig. Nco tseg: (MC 40,000, 60,000, 75,000) Xaiv lub No. 4 rotor nrog lub nrawm ntawm 6 revolutions.
3. Dissolved xeev hauv dej:
Saib xyuas cov txheej txheem thiab ceev ntawm kev tawg thaum lub sij hawm tus txheej txheem ntawm configure nws mus rau hauv ib tug 2% tov.
4. Cov ntsiab lus tshauv:
Nqa cov plooj (porcelain crucible) thiab hlawv nws nyob rau hauv ib tug nees boiling rauv, txias nws nyob rau hauv ib tug desiccator, thiab hnyav nws kom txog rau thaum lub luj yuav tas li. Ua kom raug hnyav (5 ~ 10) grams ntawm cov qauv nyob rau hauv lub crucible, ua ntej ci lub crucible ntawm lub cub hluav taws xob, thiab tom qab nws ncav cuag carbonization tiav, muab tso rau hauv ib tug nees boiling rauv li (3 ~ 4) h, thiab ces muab tso rau nws. nyob rau hauv ib tug desiccator kom txias nws. Ntsuas kom qhov hnyav tas li. Kev suav tshauv (X):
X = (m2-m1) / m0 × 100
Nyob rau hauv cov mis: m1 —— qhov loj ntawm lub crucible, g;
m2 —— Tag nrho cov crucible thiab tshauv tom qab ignition, g;
m0 —— qhov loj ntawm cov qauv, g;
5. Cov ntsiab lus dej (poob ntawm ziab):
Qhov hnyav 5.0g qauv ntawm lub tais ntawm cov ntsuas dej nrawm nrawm thiab kho nws mus rau xoom cim kom raug. Ua kom kub thiab kho qhov kub kom (105 ± 3) ℃. Thaum lub ntsuas ntsuas tsis txav, sau tus nqi m1 (qhov hnyav yog 5mg).
Cov ntsiab lus dej (poob ntawm ziab X (%)) suav:
Luas = (m1/5.0) × 100
Post lub sij hawm: Nov-02-2021