Sodium carboxymethyl cellulose (CMC) is a cellulose derivative, an ionic cellulose gum, and owing to its unique thickening, suspending, adhesion, and water retention properties, is widely used in various industrial fields.
According to the different purity, Sodium carboxymethyl cellulose is in the appearance of white or yellowish powder and soluble in cold and hot water. Sodium carboxymethyl cellulose is divided into a variety of models depending on the degree of substitution, solution viscosity and the purity. Heating Sodium carboxymethyl cellulose solution, the viscosity of Sodium carboxymethyl cellulose decreases with increasing temperatures. As long as the temperature does not exceed 50 ℃, this effect is reversible, because kept at higher temperatures for a long time, the alkaline substances in the solution can cause the degradation of Sodium carboxymethyl cellulose.
The solution viscosity remains normal in a wide range of pH values but the most stable in the range of pH 7-9. As the pH value decreases, the solution will be acidified. Sodium carboxymethyl cellulose will be gradually changed from the salt type into the water-insoluble acid type and precipitated from the solution. When the pH value is below 4, most of the salt type changes into the acid type, forms a three dimensional network structure and precipitates out. Generally speaking, the higher the DS value of Sodium carboxymethyl cellulose is, the better the compatibility with salts will be. Adding salt into the Sodium carboxymethyl cellulose solution can have better effects than dissolving in salt water.
Sodium carboxymethyl cellulose can be used in the ceramic body, glaze slurry and fancy glaze. In the ceramic body, Sodium carboxymethyl cellulose can be used to improve the shaping of mud materials, facilitate the shaping of green body, increase the flexural strength of green body, and is a good enhancing agent; in the glaze slurry and fancy glaze, Sodium carboxymethyl cellulose can be used as a binder and plays the role of suspending, de-agglomeration and water retention.
With small amount, the plasticity of mud materials and the flexural strength of raw materials can be increased significantly; the loss on ignition is good, with no residue after ignition; the suspending and dispersing properties are strong, preventing raw material particles from coagulation.
The dispersion and performance of protective colloids are excellent, making the glaze slurry in a stable dispersion state; it can effectively improve the surface tension of glaze, prevent water diffusing from the glaze into embryoid body, and increase the smoothness of the glaze surface; under the condition of a small amount, it can effectively regulate the rheological property of glaze slurry, easy for glazing; it can improve the binding properties of glaze, significantly improve the strength of glaze surface, and prevent the glaze from peeling; the delicateness of glaze surface is high and the glaze slurry is stable.
The resistance to acid and alkali is good, and the penetrability through the screen mesh is good, effectively reducing the number of rubbing the mesh and reducing the chromatic aberration; the rheological property is good and printing is smooth, with no insolubles.
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