GB/T 2915-2013Determination of conductivity of water extract of polyvinyl chloride resins (English PDF)

2.1 Conductivity

Side length 1cm cube solution between two relatively flat reciprocal exchanges resistance (ohms) value at a predetermined temperature, in the micro-Simon

Each sub-centimeter (µS/cm).

Principle 3

The aqueous dispersion of the resin is heated to a boil, resins ionic impurities in the water extract conductivity increased by comparing it with deionized

The difference between the water conductivity to determine the conductivity of resin per unit mass of the aqueous extract.

4.1

conductivity meter measurement range (0 ~ 2) S/cm, the accuracy of ± 1% (FS), with temperature compensation.

Conductivity electrode 4.2, 0.1, 1, cell constant.

5.1

deionized water, conductivity of no greater than 3µS/cm.

5.2

isopropanol, AR.

Step 6

In previously with boiling deionized water twice conical flask was added 2.0g sample to the nearest 0.01g. Then added 5mL iso

Propanol, shake flasks, so that the sample completely wet, and then 100mL deionized water added. Put a pan on the surface of the flask, the flask was placed

On electric heating, boil 5min, cooled to room temperature. After sinking resin, the conductivity electrode into the conical flask of water extract, 30s after reading

Take the conductivity of aqueous extract. At the same time a blank test.