Cellulose Ether Viscosity Test

Lub viscosity ntawmcellulose ethers, xws li Hydroxypropyl Methylcellulose (HPMC) lossis Carboxymethyl Cellulose (CMC), yog qhov tseem ceeb uas tuaj yeem cuam tshuam rau lawv cov kev ua tau zoo hauv ntau daim ntawv thov. Viscosity yog ib qho kev ntsuas ntawm cov kua dej tsis kam ntws, thiab nws tuaj yeem cuam tshuam los ntawm cov yam ntxwv xws li concentration, kub, thiab qib ntawm kev hloov pauv ntawm cellulose ether.

Nov yog cov lus qhia dav dav txog yuav ua li cas kuaj viscosity rau cellulose ethers tuaj yeem ua:

Txoj Kev Brookfield Viscometer:

Brookfield viscometer yog ib qho cuab yeej siv los ntsuas qhov viscosity ntawm cov kua. Cov kauj ruam hauv qab no muab cov qauv qhia yooj yim rau kev xeem viscosity:

1. Kev npaj ua qauv:
   • Npaj ib tug paub concentration ntawm cellulose ether kua. Qhov concentration uas tau xaiv yuav nyob ntawm seb qhov kev xav tau tshwj xeeb ntawm daim ntawv thov.
2. Kub Equilibration:
   • Xyuas kom meej tias tus qauv yog sib npaug rau qhov ntsuas kub xav tau. Viscosity tuaj yeem yog qhov kub thiab txias, yog li kev ntsuas ntawm qhov ntsuas kub yog qhov tseem ceeb rau kev ntsuas kom raug.
3. Calibration:
   • Calibrate Brookfield viscometer siv cov txheej txheem calibration kua los xyuas kom meej nyeem ntawv.
4. Loading tus qauv:
   • Load ib tug txaus npaum li cas ntawm cov cellulose ether tov rau hauv lub viscometer chamber.
5. Kev xaiv ntawm Spindle:
   • Xaiv qhov tsim nyog spindle raws li qhov xav tau viscosity ntau ntawm cov qauv. Cov spindles sib txawv muaj rau qhov qis, nruab nrab, thiab siab viscosity ntau.
6. Kev ntsuas:
   • Tso lub spindle rau hauv cov qauv, thiab pib lub viscometer. Lub spindle rotates ntawm qhov ceev tsis tu ncua, thiab kev tiv thaiv kev sib hloov yog ntsuas.
7. Cov ntaub ntawv kaw:
   • Sau cov viscosity nyeem los ntawm viscometer zaub. Qhov ntsuas ntsuas feem ntau yog nyob rau hauv centipoise (cP) lossis millipascal-seconds (mPa·s).
8. Rov ntsuas dua:
   • Ua ntau yam kev ntsuas los xyuas kom meej tias kev rov tsim dua tshiab. Yog tias qhov viscosity txawv raws sijhawm, kev ntsuas ntxiv yuav tsim nyog.
9. Kev txheeb xyuas cov ntaub ntawv:
   • Tshawb xyuas cov ntaub ntawv viscosity hauv cov ntsiab lus ntawm cov ntawv thov. Cov ntawv thov sib txawv tuaj yeem muaj cov hom phiaj viscosity.

Cov yam ntxwv cuam tshuam rau viscosity:

1. Concentration:
   • Qhov siab dua ntawm cov tshuaj cellulose ether feem ntau ua rau muaj viscosities ntau dua.
2. Kub:
   • Viscosity tuaj yeem yog qhov kub thiab txias. Qhov kub siab dua tuaj yeem txo viscosity.
3. Degree ntawm Hloov:
   • Qib ntawm kev hloov ntawm cellulose ether tuaj yeem cuam tshuam nws cov thickening thiab, yog li, nws viscosity.
4. Shear Rate:
   • Viscosity tuaj yeem sib txawv nrog tus nqi sib txawv, thiab cov viscometers sib txawv tuaj yeem ua haujlwm ntawm cov nqi sib txawv.

Ib txwm ua raws li cov lus qhia tshwj xeeb uas muab los ntawm cov chaw tsim khoom ntawm cellulose ether rau kev kuaj viscosity, raws li cov txheej txheem yuav txawv raws li hom cellulose ether thiab nws daim ntawv thov.