Is the more sodium tripolyphosphate technical grade added to the glaze slurry, the better the fluidity?

Poor fluidity of the glaze slurry is a common phenomenon during the production and processing of ceramic glaze slurry and glaze application. There may be a paste-like or tofu-like fluid in the glaze slurry, and serious lumps may also form, which will be brought to the subsequent production progress Great trouble. The sodium tripolyphosphate suspension stabilizer is mainly an additive that has a thickening effect on the glaze slurry and prevents precipitation of the glaze slurry. The mechanism of action is similar to the dispersion effect, and it is a commonly used suspension stabilizer in modern ceramic production. So, is the more sodium tripolyphosphate technical grade added to the glaze slurry, the better the fluidity?

Many ceramic companies think that the more sodium tripolyphosphate is added, the better the flow effect of the slurry. In fact, this is not necessarily the case. The role of ceramic additives is mainly reflected in two aspects: one is as a process additive, such as improving processing conditions, speeding up equipment running speed, and simplifying the process; the other is as a functional additive, such as adding products to have certain specific functions.

The mechanism of action of sodium tripolyphosphate is to solve some solid particles that are insoluble or slightly soluble in water with the help of the ceramic additive sodium tripolyphosphate. Sodium tripolyphosphate can be more evenly dispersed in the liquid medium in the glaze slurry , To form a fine, highly suspended, flowable, stable liquid solid system that plays a role in improving slurry suspension stability.

The addition of sodium tripolyphosphate to the glaze slurry does not mean that the more it is added, the better the fluidity. The amount of its addition is within a certain range. The dosage is too small to play its due role; too high dosage may cause side effects; On the other hand, the quality of sodium tripolyphosphate itself should be stable and reliable. For example, in one-time firing frit glaze, Sima medium sticks C50G methyl, the addition amount is 0.12%, sodium tripolyphosphate is 0.25%, the glaze slurry can remain unchanged for one week, and the specific gravity flow rate is basically stable within one week The raw glaze can be kept for more than half a month. In the secondary firing frit glaze, Sima low-viscosity C25G or C12G methyl group is used. The added amount is 0.08% and sodium tripolyphosphate is 0.16%. The shelf life is no problem, and it is particularly suitable for online roller printing process.

Therefore, under the guarantee of production process requirements, the appropriate amount of sodium tripolyphosphate can increase the fluidity of the glaze slurry, and also increase the strength of the glaze, and reduce the damage to the glaze by external forces such as screen scrapers and edge washing. At present, the ceramic grade sodium tripolyphosphate produced by Chongqing Chuandong Chemical Group thermal process, the impurities are relatively controllable, the amount is relatively small compared to some common sodium tripolyphosphate, the disguised ones can also save energy for ceramic enterprises Production cost.