Bonding mechanism of sodium hexametaphosphate in coatings

The main bonding mechanism of sodium hexametaphosphate is that sodium hexametaphosphate is viscose after absorbing water, which is closely related to the nature of sodium hexametaphosphate itself. The molecular formula of sodium hexametaphosphate is generally NaPo3, which belongs to an anion group of polyphosphate sodium hexametaphosphate with an indeterminate composition. The molecular weight of the anion group of sodium hexametaphosphate is very high, and the number of PO3 groups is usually as high as 30-90, forming a long chain. Sodium hexametaphosphate is hydrolyzed into orthophosphate in aqueous solution.

Due to the addition of sodium silicate and other alkaline substances, the alkaline environment with PH value of 10-10.5 was prepared. That is to say, the concentration of OH-ion in the coating is high, the reaction proceeds to the right, which is conducive to the further decomposition of H3PO4, and also promotes the conversion of sodium hexametaphosphate to orthophosphate. At this time, the phosphate will undergo the condensation of multiple phosphate functional groups. Especially at high temperature, the molecular group of sodium hexametaphosphate will have condensation effect. After condensation, the molecular group will combine with the three-dimensional network structure of bentonite molecular group in the paint, which effectively plays a bonding role.

Zhengzhou Yucai Phosphate Chemical Plant specializes in producing: sodium hexametaphosphate, sodium pyrophosphate, sodium tripolyphosphate, disodium hydrogen phosphate, industrial phosphoric acid, trisodium phosphate, aluminium dihydrogen phosphate, solid aluminium dihydrogen phosphate, liquid aluminium dihydrogen phosphate, sodium dihydrogen phosphate and other phosphate series products, after more than 30 years of continuous pursuit and development, relying on skilled chemical technology and product development, equipment updating and more. Colleges and universities have established a good cooperative and sharing relationship, playing a brand in the chemical industry (Yucai Phosphate)!