Wuxi Highness Technology Co., Ltd

 

For example, hydroxyethylidene diphosphonic acid (HEDP) and aminotrimethylene phosphonic acid (ATMP), etc., are part of the molecular function of its molecules, through electrostatic adsorption on the formation of metal salts are formed crystals (crystal nuclei ) At the active point of the surface, thereby inhibiting the growth of the crystal so that many of the crystals formed remain in the microcrystalline state, which is equivalent to increasing the solubility of the scale metal salt in water; at the same time, since the scale inhibitor molecules are on the crystal surface Of the crystal, even if the growth of the crystal can only be deformed, which makes the crystal distortion. After the distortion of the crystal and metal surface adhesion weakened, it is not easy to deposit on the metal surface; due to adsorption on the crystal surface of the functional group Only part of the functional groups in the molecule of the scale inhibitor, those who do not participate in the adsorption of functional groups, the crystal will show ionic, due to increased repulsion of the charge leaving the crystal in the dispersed state of the above three effects exist at the same time, The same amount of scale metal salt does not scale on the metal surface of the scale inhibitor required, much lower than the same amount of the scale metal salt chelate in water so that it does not precipitate the required chel This is called the "Threshold effect" (also known as "low-limit effect" or "sub-stoichiometry effect." Thus, they can disperse insoluble inorganic Salt, to prevent or interfere with the insoluble inorganic salt in the metal equipment on the surface of the deposition, scaling, maintenance of metal equipment has a good heat transfer effect, to ensure the normal production. Scale inhibitors mainly include some natural dispersant, phosphonic acid, phosphonic acid And phosphine sulfonic acid and polymer, etc., and the current use of the vast majority of scale and dispersant is a high molecular polymer.

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Water treatment in the earliest application of the scale inhibitor to be about to calculate the phosphate. Polymeric phosphate in addition to scale inhibition, but also both corrosive effect, but its drawback is easy hydrolysis of orthophosphate, if the control misconduct So that the problem is not too serious calcium carbonate scale into a very serious problem of calcium phosphate scale .20 century 60 years the advent of organic phosphoric acid (salt) scale inhibitor, indicating that the water calcium carbonate scale inhibition technology has made a breakthrough. This ultra-low chromium formulation is also used in the pH range of 7.5-8.5 The use of high pH results in the requirement for the amount of chromate used for corrosion inhibition from the traditional The 15-25 mg / L of the chromium-phosphorus-zinc formulation is reduced to 5-10 mg / L, which greatly reduces the adverse effects on the environment. The reason why this is due to the application of organic phosphonic acid (salt) scale inhibitors Calcium carbonate in water has a controlled deposit in the cathode region of the metal surface. This controlled deposition of calcium carbonate acts as a cathodic corrosion inhibitor. The application of organic phosphonic acid (salt) scale inhibitors also So that the classic circulating cooling water polyphosphate - organic phosphonic acid (salt) - poly Acrylic acid (salt) of the alkaline treatment of phosphorus is widely used, while the phosphate alkaline treatment formula has been further improved, it should be attributed to the occurrence of calcium phosphate scale inhibitor scale inhibitor. Like acrylic acid / methyl acrylate Binary copolymer, acrylic acid / hydroxypropyl acrylate / methyl acrylate terpolymer, acrylic acid / acrylamide methyl propane sulfonic acid / hypophosphorous acid terpolymer, etc., are developed for the inhibition of calcium phosphate scale. Said that today, calcium carbonate scale and calcium phosphate scale has a special effect of scale inhibitor, then for calcium silicate, iron oxide scale, zinc hydroxide scale, calcium sulfate scale and barium sulfate scale, it is not so There are special effects of scale inhibitors, although many of the agents were on these scale showed a scale effect.

At present, the research on scale inhibition and dispersant has focused on the development of various copolymers, and it is developing in the direction of preparing a multi-energy water treatment agent.In addition, in recent years, the development of environment-friendly scale inhibitor is Protect the environment and water resources from pollution.