Scale inhibition principle of scale inhibitor
classification： Industry Knowledge
Scale inhibitors are used in places with dirt, which can quickly remove dirt. If you sprinkle it in a place where descaling is needed, it can also prevent the growth of dirt. It uses the following scale inhibition principle:
The scale inhibitor can be separated from calcium and magnesium in water to form a stable soluble chelate, and more calcium and magnesium ions are stabilized in water, thereby increasing the solubility of calcium and magnesium salts and inhibiting the deposition of scale.
2. Mechanism of action of electric double layer, etc.
Enrichment within the diffusion boundary layer near the growing nucleus forms an electric double layer and prevents scale ions or molecular clusters from condensing on the metal surface.
3. Lattice distortion
After adding the scale inhibitor, the reagent is adsorbed on the crystal and doped in the lattice of the crystal lattice, which interferes with the crystal of the inorganic scale, causes the crystal to be distorted, or increases the stress inside the large crystal, thereby making the crystal easy Cracking, hindering the growth of scale.
4. Regeneration release inhibition
The reagent can form a film co-precipitated with the inorganic crystal particles on the metal heat transfer surface. When the film is increased to a certain thickness, the film is broken on the heat transfer surface, and a certain size of the scale layer leaves the heat transfer surface. The continuous formation and rupture of the seed film inhibits the growth of the scale layer.
5. Cohesion and dispersion
When anion generated by dissociation in water collides with calcium carbonate crystallites, physicochemical adsorption occurs, and the surface of the microcrystal grains forms an electric double layer, so that the chain structure of the negatively charged scale inhibitor can adsorb multiple The same charge of the crystallites, the electrostatic repulsion can prevent the crystallites from colliding with each other, thus avoiding the formation of large crystals. When the adsorbed product hits other molecules, the adsorbed crystals are transferred, and the crystal grains are uniformly dispersed, thereby hindering the crystal. Interparticle and grain collisions with the metal surface reduce the number of nuclei in the solution and stabilize the calcium carbonate in the solution.
The scale inhibitor contains effective scale inhibiting components, and utilizes the principle of dirt and acid radical reaction to increase the brightness while removing dirt and ensure the effect of scale inhibition. This is an environmentally friendly descaling reagent, which is widely used in industry. Applications.
The maleic acid acrylic acid copolymer is a low molecular weight polyelectrolyte prepared by copolymerizing maleic acid and acrylic acid in a certain ratio, has strong dispersion effect on carbonates, etc., has high thermal stability and can be heated at 300 ° C. It can be used under harsh conditions and has good compatibility and synergistic effect with other water treatment agents. It has a good inhibitory effect on the formation of scale including phosphate. Because of its excellent scale inhibition performance and high temperature resistance, maleic acid acrylic copolymer is widely used in low pressure boilers, central heating, central air conditioning and various circulating cooling water systems.