Sodium Hexametaphosphate Is A Commonly Used Inorganic Dispersant

When we usually says dispersants, you may not know what they are. When materials were not so developed, people thought that some mechanical tools that could stir were dispersants because they could muddy clean water and disperse the whole. Humans learned brewing, dyeing, smelting and other technologies from them. Modern dispersants can be divided into two categories: organic and inorganic. Sodium hexametaphosphate is a commonly used inorganic dispersant.

There are more than a thousand kinds of dispersants in the world, and they are divided into six types according to their structure: anionic; cationic; nonionic; amphoteric; electrically neutral; high molecular weight (including high, medium and low molecular weight). Detergents, for example, achieve the purpose of washing by stripping and coating stains and dispersing them in water. Sodium hexametaphosphate belongs to the class of polymetaphosphates. Its molecular structure is cyclic, but it has a linear long chain configuration. It can be adsorbed on the surface of particles through end groups, while the middle chain basically does not participate in bonding, so it can increase electrostatic repulsion. 

Sodium hexametaphosphate dissolved in water ionizes anions and adsorbs them on the surface of particles, increasing the negative charge of the particle surface; in addition, the ionized nitrogen ions can increase the thickness of the double electric layer. Sodium hexametaphosphate plays a dispersing role in these two processes.

Sodium hexametaphosphate

SHMP 68% Min

Functions of sodium hexametaphosphate dispersant:

① Adding sodium hexametaphosphate can accelerate the deagglomeration of "agglomerates" and shorten the dispersion time.

② Sodium hexametaphosphate can delay the reagglomeration time of particles through the process of wetting, grinding and dispersion, coupling and encapsulation stabilization, and keep the particles in a dispersed state for a long time.

In addition to its wetting effect, the dispersant's active group can adsorb on the surface of the pigment crushed into fine particles at one end, and solvate into the paint base at the other end to form an adsorption layer (the more adsorption groups, the longer the chain segments, the thicker the adsorption layer), generating charge repulsion (water-based paint) or entropy repulsion (solvent-based paint), allowing the pigment particles to be dispersed and suspended in the paint base for a long time, avoiding re-flocculation, thereby ensuring the storage stability of the finished paint system.

Sodium hexametaphosphate as a dispersant refers to a substance that is added to the particle size measurement medium to improve the affinity between the particle surface and the medium, so that the particles can be easily wetted and maintained in a dispersed state in the medium; or a substance that can produce steric hindrance to form a complete covering layer on the particle surface to prevent agglomeration between particles.

Experiments have pointed out that sodium hexametaphosphate is indispensable for the addition of sodium hexametaphosphate before the reaction to make the reactants evenly dispersed and then generate products with uniform morphology through related chemical reactions, to the addition of sodium hexametaphosphate after the reaction to extract the products through related separation methods, and then to the addition of sodium hexametaphosphate in subsequent functional tests to make the product performance more stable.

Sodium hexametaphosphate as a dispersant refers to a substance that is added to the particle size measurement medium to improve the affinity between the particle surface and the medium, so that the particles can be easily wetted and maintained in a dispersed state in the medium; or a substance that can produce steric hindrance to form a complete covering layer on the particle surface to prevent agglomeration between particles.

Experiments have pointed out that sodium hexametaphosphate is indispensable for the addition of sodium hexametaphosphate before the reaction to make the reactants evenly dispersed and then generate products with uniform morphology through related chemical reactions, to the addition of sodium hexametaphosphate after the reaction to extract the products through related separation methods, and then to the addition of sodium hexametaphosphate in subsequent functional tests to make the product performance more stable.

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