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Sodium polyacrylate is a water-soluble polymer compound, referred to as PAANa, the molecular formula is [C3H3O2Na]n, the relative molecular weight varies from hundreds to tens of millions, and the appearance is diverse, colorless or yellowish liquid, viscous liquid, gel, resin or solid powder, particles, dissolved in cold water, warm water, glycerol, propylene glycol, and other media, stable to temperature changes. When the pH is around 4, it is easy to gel; when the pH is around 2.5, it is close to dissolving. The pH value of aqueous solution is generally between 6-9, and it is easily soluble in sodium hydroxide aqueous solution, but it will first dissolve and then precipitate in aqueous solutions such as calcium hydroxide and magnesium hydroxide.