The amount of sodium carboxymethyl cellulose added affects its concentration in the glaze slurry, and the viscosity of the glaze slurry increases with the increase of the amount of CMC added.
The principle for determining the amount of addition is:
1. Determine the addition amount of sodium carboxymethyl cellulose according to the glaze formula. The content of plastic raw materials in the glaze is high, and the amount of CMC added is small, on the contrary, the amount of CMC added is large.
2. Determined according to the glaze slurry process parameters. For glaze slurry with strong adhesion and slow drying speed, the amount of sodium carboxymethyl cellulose CMC added is higher, and vice versa.
3. Determined according to the CMC viscosity using sodium carboxymethyl cellulose. When the viscosity of CMC is high, the addition amount is small, and when the viscosity is low, the addition amount is large.
4. Determine the added amount according to the experimental results.
Generally, the low viscosity sodium carboxymethyl cellulose is added in an amount of 0.2-0.5%;
Medium viscosity and high viscosity sodium carboxymethyl cellulose is added in an amount of 0.1-0.3%.
In addition, the amount of sodium carboxymethyl cellulose added varies with the season. When the temperature is high in summer, the viscosity of CMC solution decreases with the increase of temperature, so the amount of CMC added in summer should be appropriately increased compared with other seasons. In the rainy season, the air humidity is high, the surface of the embryo body is moist, and the drying is slow. Therefore, the drying speed of the glaze slurry should be increased, and the amount of sodium carboxymethyl cellulose CMC added should also be appropriately reduced.
