Sodium Hexametaphosphate Is A Commonly Used Inorganic Dispersant

Dispersant we may not know what is, in the material is not so developed, people think that some stirring mechanical tools is the dispersant, the reason can muddy the water, the whole dispersion, from human learning brewing, dyeing, smelting and other technologies. Modern dispersants can be divided into organic and inorganic two categories, sodium hexametaphosphate is commonly used inorganic dispersants.

There are more than one thousand kinds of dispersants in the world, and there are six kinds according to the structure: anionic type; Cationic type; Non-ionic type; Amphoteric type; Electroneutral type; Polymer type (including high, medium and low molecular weight). Like detergent is by peeling, coating stains, so that they are dispersed in water, so as to complete the purpose of washing.

Sodium hexametaphosphate

68% Min SHMP

Sodium hexametaphosphate belongs to polymetaphosphate. Its molecular structure is cyclic, but it has a linear long chain configuration, which can be adsorbed on the surface of the particle through the end group, and the middle chain is basically not involved in bonding, so it can increase the electrostatic repulsion. Sodium hexametaphosphate dissolved in water ionizes the anion and adsorbs it on the surface of the particle, which increases the electronegativity of the particle surface. In addition, the ionized nitrogen ions can increase the thickness of the double electric layer, and sodium hempetaphosphate plays a dispersive role in both processes.

Action of sodium hexametaphosphate dispersant:

(1) The addition of sodium hexametaphosphate can accelerate the depolymerization rate of "aggregates" and shorten the dispersion time.

(2) Sodium hmetaphosphate can delay the time of reagglomeration of particles through the process of wetting, grinding and dispersion, coupling and packaging stability, and keep particles in a dispersed state for a long time.

In addition to the wetting effect of the dispersant, one end of the active group can be adsorbed on the surface of the pigment crushed into fine particles, and the other end can be solvated into the paint base to form an adsorption layer (the more the adsorption base, the longer the chain, the thicker the adsorption layer), resulting in charge repulsion (water-based paint) or entropy repulsion (solvent-based paint), so that the pigment particles are dispersed and suspended in the paint base for a long time to avoid flocculation again. Therefore, the storage stability of the color paint system is ensured.

The use of sodium hexametaphosphate as a dispersant refers to the substance added to the particle size measurement medium which can improve the affinity between the particle surface and the medium, so that the particles can easily infiltrate and maintain the dispersion state in the medium. Or a substance that generates steric hindrance to form a complete coating on the surface of the particles to prevent agglomeration between the particles.

Some experiments have pointed out that the help of sodium hexametaphosphate is inseparable from the addition of sodium hexametaphosphate before the reaction to evenly disperse the reactants and generate products with uniform morphology through relevant chemical reactions, to the addition of sodium hexametaphosphate after the reaction to extract the generated products through relevant separation means, and to the addition of sodium hexametaphosphate in subsequent functional tests to make the product performance more stable.

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