The manufacturer tells you the dispersing effect of sodium hexametaphosphate

The dispersing effect of sodium hexametaphosphate is due to its hydrolyzed anions adsorbed on the particle surface. In order to improve the dispersing effect, the hydrolysis degree of the dispersant can be selectively increased. It is believed that we all know that the function of dispersant is to increase the distance between the large particles to be dispersed in the solution and reduce the viscosity of the whole solution. However, the amount of sodium hexametaphosphate used in the dispersion of different substances is also different.

In the process of material dispersion, the surface of large particles adsorbs the dispersant to form a double electric layer, and anions are closely adsorbed on the surface of particles, which is called surface ions. Ions with opposite charges in the medium are called anti ions. In the process of medium movement, particles and particles, as well as the electric double layer and the electric double layer have the same charge, which will generate electrostatic repulsion, so that it is difficult for large particles to contact each other or even agglomerate into larger particles.

Sodium hexametaphosphate is a common anionic dispersant, which can form anions by ionization in water and has certain surface activity. The surface of large particles will have holes or positive charges (generated by hydrolysis), so that anions can be adsorbed.

Sodium hexametaphosphate can be linked and polymerized into a long spiral chain, which can be adsorbed on the surface of particles to enhance the hydrophilicity of particles, and significantly improve the negative potential on the surface of particles, so that the double electric layer is more stable and the dispersion effect is better.