What Are the Advantages of Polyanionic Cellulose over Sodium Carboxymethyl Cellulose in Ceramic Glaze Paste?

What Are the Advantages of Polyanionic Cellulose over Sodium Carboxymethyl Cellulose in Ceramic Glaze Paste?

Ⅰ. What is the difference between polyanionic cellulose and sodium carboxymethyl cellulose?


Sodium carboxymethyl cellulose is odorless, tasteless, tasteless, hygroscopic, safe and reliable, and can be used in food. Polyanionic cellulose has the characteristics of heat stability, salt resistance and strong antibacterial properties. Both have different characteristics.


1. When used in tile base glaze and surface glaze, the dispersibility and protective colloid properties of polyanionic cellulose PAC should be better, so that the glaze can be in a dispersed state and remain stable.


2. After adding PAC, the surface tension of the glaze can be significantly increased, which can effectively prevent water from diffusing into the blank through the glaze, which can increase the smoothness of the glaze and avoid cracking and printing breakage caused by the decrease in the strength of the blank due to glazing. And it can also effectively reduce the glaze pinhole phenomenon after baking.


3. It can improve the nodule properties of the glaze and prevent deglazing.


4. It can adjust the viscosity of the glaze slurry, and the polyanionic cellulose PAC makes the glaze slurry have better rheology, which is convenient for glazing.


5. It can adjust the drying time of the glaze layer, and make the glaze surface smoother on the basis of improving the stability of the glaze paste.


In the above comparison of polyanionic cellulose and sodium carboxymethyl cellulose, polyanionic cellulose is more suitable for ceramic glaze due to its good dispersibility and protective colloid.


The characteristics of sodium carboxymethyl cellulose are more suitable for food additives, and the emulsifying properties of animal and vegetable oils, proteins and aqueous solutions are extremely excellent, so polyanionic cellulose is more suitable in ceramic glaze paste.


Ⅱ. Application of sodium carboxymethyl cellulose in electric enamel


As a kind of ceramics, the production process of electric porcelain is more complicated and strict, and research is still being done to continuously improve the performance of electric porcelain in production.


Because sodium carboxymethyl cellulose has a wide range of use, it can play a certain role in electric porcelain, so that sodium carboxymethyl cellulose can play a greater advantage. What are its specific roles?


In order to enhance the mechanical strength, aesthetics and anti-fouling ability of the electric porcelain, a layer of glaze needs to be applied to the surface of the electric porcelain. However, in the production of electric porcelain, there are often phenomena such as glaze, deglazing, and glaze bubbles, which will cause great losses. Through research, it is found that adding sodium carboxymethyl cellulose to the glaze can have a good effect.


When the pH of sodium carboxymethyl cellulose is greater than 10 or < 5, the viscosity of the dope is significantly reduced, and the performance is better when the pH is 7 (here refers to conventional sodium carboxymethyl cellulose).


Sodium carboxymethyl cellulose is often used as anti-settling agent, emulsifier, dispersant, leveling agent and binder for coatings, which can make the solid components of the coating evenly distributed in the solvent, so that the coating does not delaminate for a long time.


In addition, it can also be used as a flocculant, a chelating agent, a thickening agent, a water-retaining agent and a sizing agent, and its application in electric enamel is mainly due to its good dispersibility and nodularity.


There are two ways to add sodium carboxymethyl cellulose to the pulp:


1. Directly mix the powder of sodium carboxymethyl cellulose into the glaze slurry and stir to dissolve.


2. First dissolve sodium carboxymethyl cellulose in water, and then mix sodium carboxymethyl cellulose aqueous solution with glaze slurry.


In the production of electric porcelain, sodium carboxymethyl cellulose can improve the use effect of the surface glaze of electric porcelain, and can also play a good dispersibility and nodularity.


At the same time, when adding again, you can refer to the above method to select an appropriate addition method, which can play a greater role while improving the performance of sodium carboxymethyl cellulose.