Product Description
Chinese Name: scale inhibitor
English Name: scale inhibitor, deposit control inhibitor
Definition: to prevent or inhibit the growth of scale produce chemicals. Main scale and corrosion inhibitor and scale inhibition and dispersion agent two.
Applied Science: Marine Science and Technology ( a subject ); marine technology ( two subjects ); water resources development technology ( three subjects )
The content by the National Committee for terms in sciences and technologies validation published
Scale inhibitor
Scale inhibitor ( scale inhibitor ): refers to can be dispersed in water insoluble inorganic salts, block or interfere with insoluble inorganic salts on the surface of metal precipitation, scaling function, and maintain the equipment of metal with good heat transfer effect of a class of agents. Cooling equipment for corrosion inhibitor with epoxy resin and amino resin as base material, adding proper amount of various anti-rust, anti-corrosion and other additives formulated, as a single component. It has excellent shielding, impermeability, antirust performance, good scale inhibition, thermal conductivity, excellent resistance to acid, alkali, organic solvents and other properties, its strong adhesion, and film bright, pliable, dense, hard.
Mechanism of action
Corrosion inhibitor mechanism is divided into: the Internet and solubilization, lattice distortion effects, electrostatic repulsion.
The Internet and solubilization
The 1 network and solubilization is copolymer dissolved in water to generate negative ionization occurs, the molecular chain, it with Ca2 + to form soluble complexes and chelates, so that the inorganic salt solubility increases, the scale inhibition.
Lattice distortion effect
2 lattice distortion is composed in part of functional groups in the molecule of inorganic salt crystal nucleus or microcrystalline, occupy a certain position, block up and destroyed the normal growth of inorganic salt crystal, crystal growth rate slows down, thereby reducing the salt scale formation;
Electrostatic repulsion
The 3 electrostatic repulsion is copolymer dissolved in water adsorption on inorganic salt microcrystalline, make particles between the repulsive force increases, hinder their coalescence, making them a good dispersed state, so as to prevent or reduce scale formation.
Scale inhibitor classification
Organic phosphine series inhibitors, organic phosphonate inhibitor, polycarboxylic acid type composite antisludging agent, dispersing agent, RO inhibitor
The effect of scale inhibitors:
Organic phosphine series inhibitors
ATMP has excellent chelation, low threshold inhibition and lattice distortion effect. Can prevent the dirt in the water into salt scale formation, especially the formation of calcium carbonate scale. ATMP in the water chemical properties of stability, not easy to hydrolysis. Concentration in water is high, with good corrosion inhibition effect.
HEDP is a kind of organic phosphonic acid inhibitor, with iron, copper, zinc and other metal ions to form stable complexes, can dissolve the surface of metal oxides. In 250 DEG C can still have a good corrosion inhibition effect, under high pH is still stable, is not easy to be hydrolyzed, general thermal conditions difficult decomposition. Acid and alkali resistance, resistance to chlorine oxidation properties than other organic phosphonic acid ( salt ).
EDTMPS is a nitrogen-containing organic polybasic phosphonic acid, is a cathodic inhibitor, and inorganic phosphate, corrosion rate of 3 ~ 5 times. Can be miscible with water, no pollution, chemical stability and good temperature resistance, under 200 degrees still has good scale inhibition effect. EDTMPS in aqueous solution from the solution into 8 positive and negative ions, and thus can be associated with multiple metal ion chelation, forming a plurality of monomer structure of macromolecular network complex, loosely dispersed in water, so that the calcium carbonate scale normal crystallization is destroyed. EDTMPS on calcium sulfate, barium sulfate scale inhibitor effect is good.
EDTMPA has a strong ability to chelate metal ions, and the copper ion complexing constants including EDTA, all of chelating agents in the largest. EDTMPA high pure reagent and non-toxic, in the electronics industry can be used as a semiconductor chip cleaning agent used in the manufacture of integrated circuit; in the pharmaceutical industry as a radioactive element carrying agent, used for screening and treatment of disease; EDTMPA chelating ability is far more than EDTA and DTPA, in almost all use EDTA as chelating agent places are available EDTMPA replacement.
