Pigment makes life more colorful, and the color of pigment is more bright. It is widely used in home decoration, architecture and other places. Therefore, stabilization of depolymerized pigment particles in the process of pigment dispersion is also a very important link, otherwise the pigment will be re-flocculated during storage and construction, resulting in a decrease in the quality of the pigment. Sodium hexametaphosphate(SHMP) has a good dispersing effect on pigments, which increases the surface energy of pigments and has a tendency of aggregation.
In the dispersion system of pigment, the stability of pigment is achieved mainly through two mechanisms of charge stabilization and three-dimensional protection. More commonly used is to add some surfactants or inorganic dispersants, because the aqueous solution of SHMP is alkaline, the dispersion of dispersing media is stronger, the effect of reducing viscosity is more obvious, so it is more suitable for use as a viscosity reducer.
SHMP has good viscosity reduction effect on dispersing media, because PO43-after hydrolysis of phosphate is easy to adsorb with the positive edge of protective adhesive end surface, forming negative edge. Both the wafer surface and the end are negative, and the wafers repel each other and become stable suspension with low viscosity and high dispersion in water medium, so the viscosity decreases sharply.
Therefore, the bonding mechanism of SHMP is: it is a viscose after water absorption, which is closely related to the nature of SHMP itself. The molecular formula of SHMP is (NaPO3)6, which is a kind of uncertain composition. Phosphate, an anion of SHMP has a high molecular weight, generally containing up to 30~90 PO3 genes and forming a long chain.
SHMP, an inorganic salt, can reduce the particle size of protective glue particles in water, reduce the interaction between particles, significantly reduce the viscosity and improve its fluidity.
