1. Appearance:
Visually inspect under natural scattered light.
2. Viscosity:
Weigh a 400 ml high-stirring beaker, weigh 294 g of water into it, turn on the mixer, and then add 6.0 g of the weighed cellulose ether; stir continuously until it is completely dissolved, and make a 2% solution; After 3-4 h at the experimental temperature (20±2)℃; use the NDJ-1 rotary viscometer to test, and select the appropriate viscometer rotor number and rotor speed during the test. Turn on the rotor and put it in the solution and let it stand for 3-5 minutes; turn on the switch and wait for the value to stabilize, and record the result. Note: (MC 40,000, 60,000, 75,000) Select the No. 4 rotor with a speed of 6 revolutions.
3. Dissolved state in water:
Observe the process and speed of dissolution during the process of configuring it into a 2% solution.
4. Ash content:
Take the porcelain crucible and burn it in a horse boiling furnace, cool it in a desiccator, and weigh it until the weight becomes constant. Accurately weigh (5~10) grams of sample in a crucible, first roast the crucible on an electric furnace, and after it reaches complete carbonization, put it in a horse boiling furnace for about (3~4) h, and then put it in a desiccator to cool it. Weigh until constant weight. Ash calculation (X):
X = (m2-m1) / m0×100
In the formula: m1 ——the mass of the crucible, g;
m2 ——Total mass of crucible and ash after ignition, g;
m0 ——the mass of the sample, g;
5. Water content (loss on drying):
Weigh 5.0g sample on the tray of the rapid moisture analyzer and adjust it to the zero mark accurately. Increase the temperature and adjust the temperature to (105±3)℃. When the display scale does not move, write down the value m1 (weighing accuracy is 5mg).
Water content (loss on drying X (%)) calculation:
X = (m1 / 5.0) × 100
Post time: Nov-02-2021