Importance of adding sodium tripolyphosphate(STPP) in ceramic production process

In modern daily life, everyone likes exquisite ceramics, but they don't know the process of making a piece of porcelain. It is also an important part to add sodium tripolyphosphate(STPP) as dispersant in the manufacture of ceramics. In the preparation of ceramic slurry, high quality dispersant is helpful to wetting, grinding, dilution and stability, and plays an important role in improving the performance of ceramic products and reducing the manufacturing cost.

Particularly, it takes a lot of time to crush the particle size to micron size. In the process of wet milling, due to the impact, proximity and attraction of molecules or particles, the powder tends to agglomerate, and the phenomenon of "reverse grinding" occurs. In the process of grinding, when the material reaches a certain fineness, it will continue to grind, and the grinding will become coarser and coarser.

The dilution of ceramic slurry requires both high solid content and good fluidity. Adding a certain amount of sodium tripolyphosphate(STPP) as dispersant can effectively reduce the viscosity of the slurry. Adding sodium tripolyphosphate(STPP) can play a diluting role. At the same time, the use of medium can be reduced appropriately, which is conducive to reducing the energy consumption in the process of sequential treatment.

Adding sodium tripolyphosphate(STPP) as dispersant can firmly adsorb the cracks of particles and penetrate deep into the cracks. The new interface formed in the process of particle grinding is quickly encapsulated by dispersant, which hinders the re-integration of the new interface and accelerates the grinding process, obviously shortens the grinding time, saves energy consumption and improves grinding efficiency.

In the absence of dispersant, particles are mainly affected by the following four forces in water: gravity, buoyancy, particles, water interfacial tension and interaction between particles, resulting in easy settling of particles and poor slurry stability; while sodium tripolyphosphate(STPP) is used as dispersant to adsorb on the surface of particles, the surface of the original particles is partially or totally covered by dispersant, which hinders the particles. Agglomeration can improve suspension and stability of slurry.

It is worth mentioning that the ceramic grade sodium triphosphate(STPP) produced by CDchem is specially developed for ceramic production. Compared with ordinary industrial grade sodium triphosphate(STPP), it has more than 20 internal control indicators which are more suitable for ceramic production.

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