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What is the composition of the scale inhibitor and the chemical composition of the scale inhibitor?

Post Time:2016-10-18 22:34:55 

        Scale inhibitor is the daily treatment of circulating water chemistry accounts for an important position in a chemical water treatment agent, belongs to the category of fine chemicals, then the chemical composition of what kind of scale inhibitor, how to play a role, I think many of you are not very Understanding, here Xiaobian to lead everyone on the chemical composition of inhibitors to explore, in order to understand the principle of the role of scale inhibitors, a better understanding of scale inhibitors in the circulating water treatment in the important role.

        Such as hydroxyethylidene diphosphonic acid (HEDP) and aminotrimethylene phosphonic acid (ATMP), etc., are part of the functional groups in their molecules, through the electrostatic force adsorption in the scale of metal salts are forming crystals (nucleus ) At the active sites of the surface, inhibiting the crystal growth, so that the formation of many crystals remain in the microcrystalline state, which is equal to increase the scale of metal salts in water solubility; At the same time, because the inhibitor molecules on the crystal surface , The crystal can grow abnormally even if it grows, which makes the crystal distorted.The adhesion of distorted crystal to the metal surface is weakened, so it is not easy to deposit on the metal surface. Because the functional group adsorbed on the crystal surface Only part of the functional group in the scale inhibitor molecules, those who do not participate in the adsorption of functional groups, will show the ionic ion, the charge repulsive force increases the dispersion of the crystal state of the above three kinds of simultaneous presence, making the water to stop The amount of scale inhibitor required to scale the same amount of scale-free metal salt is not much lower than the amount of chelating agent needed to chelate the same amount of scale-forming metal salt in water so that it does not precipitate. Phenomenon, called the "threshold effect" (Threshold effect), also known as "low limit effect", or called "sub-stoichiometry effect" (sub-stoichiometry effect), so they can disperse the water insoluble inorganic salts to prevent or interfere with the difficult Soluble inorganic salts in the deposition of metal equipment, scaling, maintaining the metal equipment has a good heat transfer effect, to ensure the normal production.The scale inhibitor mainly includes some natural dispersing agent, phosphonic acid, phosphonic acid and phosphine sulfonic acid and high Molecular polymers, etc., while the vast majority of the current use of scale inhibitor is a high molecular polymer.
        Water treatment in the first application of the scale inhibitor to be about polymerized phosphate.Polyphosphate addition to scale inhibition, but also both corrosion inhibition.However, the disadvantage is easy to hydrolysis of orthophosphate, if the control properly, will So that the problem is not too serious calcium carbonate scale into a serious problem of calcium phosphate scale.2020s 60 years organic phosphate (salt) the advent of scale inhibitor, indicating that the water calcium carbonate scale technology has made a breakthrough. This ultra-low chromium formulation is used in the pH range of 7.5-8.5. The use of high pH values ​​makes the requirement for the amount of chromate used for corrosion inhibition to be reduced from the traditional Chromium-phosphorus-zinc formulations of 15-25mg / L down to 5-10mg / L, greatly reducing the adverse effects on the environment. The reason to do so, because the organic phosphonic acid (salt) scale inhibitor application, so that The calcium carbonate in the water surface in the cathode area of ​​the metal surface to be controlled deposition .This controlled deposition of calcium carbonate, played a cathodic corrosion inhibitor .Application of organic phosphonic acid (salt) scale inhibitor, also So that the classic circulating cooling water polyphosphate - organic phosphonic acid (salt) - polyacrylic acid (salt) of the phosphorus-based alkaline treatment with a wide range of applications.While the phosphorus-based alkaline treatment formula to be further improved, it should be attributed to Such as acrylic acid / methyl acrylate binary copolymer, acrylic acid / hydroxypropyl acrylate / methyl acrylate terpolymer, acrylic acid / acrylamide methyl propane sulfonic acid / hypophosphorous acid Ternary copolymer, etc., are for the development of calcium phosphate scale inhibition.If that, today, calcium carbonate scale and calcium phosphate scale has a special scale inhibitor, then, for calcium silicate, iron hydroxide scale , Zinc hydroxide scale, calcium sulfate scale and barium sulfate scale, then there are not so effective scale inhibitor, although many of these agents have been shown scale scale effect.
        At present, the study of scale and dispersant is focused on the development of various copolymers, and it is developing towards a multi-functional water treatment agent.In addition, in recent years, the development of environment-friendly scale inhibitor is Protection of the environment and water resources from pollution.

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