Scale inhibitor: It is a class of agents that can disperse insoluble inorganic salts in water, prevent or interfere with the precipitation and scaling of insoluble inorganic salts on metal surfaces, and maintain good heat transfer effects for metal equipment. . The anti-scaling and anti-scaling agent for cold-exchange equipment is made up of epoxy resin and specific amino resin as base materials, adding appropriate amount of various anti-rust, anti-corrosion and other auxiliary agents, and it is a single component. It has excellent shielding, impermeability, anti-rust properties, good scale inhibition, thermal conductivity, excellent resistance to weak acids, strong alkalis, organic solvents, etc. It has strong adhesion, and the film layer is bright, flexible, dense and hard. .
Scale inhibitor :100% is a class of agents that can disperse insoluble inorganic salts in water, prevent or interfere with the precipitation and scaling functions of insoluble inorganic salts on metal surfaces, and maintain good heat transfer effects of metal equipment. The anti-corrosion and anti-scaling agent of cold exchange equipment is formulated with epoxy resin and specific amino resin as the base material, adding an appropriate amount of various anti-rust, anti-corrosion and other auxiliaries, which is a one-component. It has excellent shielding, impermeability, rust resistance, good scale resistance, thermal conductivity, excellent resistance to weak acids, strong alkalis, organic solvents and other properties, its adhesion is strong, and the film layer is bright, flexible, dense and hard.
mechanism of action
In terms of mechanism of action, the role of scale inhibitors can be divided into three parts: chelation, dispersion and lattice distortion. And in the laboratory evaluation test, dispersion is the remedy for chelation, and lattice distortion is the remedy for dispersion.
Functional characteristics of high-efficiency anti-scaling agent for reverse osmosis
1. There is no need to add additional acid, which can effectively avoid the corrosion of equipment by acid substances.
2. The chelating effect is stable and can prevent metal ions such as iron and manganese from forming fouling on the membrane tube.
3. Applicable to various membrane tube materials.
4. The dosage of dosing is small, the cost of dosing is saved, and the most economical scale inhibition control can be obtained.
5. Strong anti-scaling ability, suitable for all kinds of water quality, good effect, can reduce the cleaning of the membrane and prolong the service life of the membrane.
6. The stability of the agent is far better than that of sodium hexametaphosphate or pure polymer scale inhibitor.
Our products are organic series scale inhibitors, organic phosphonate scale inhibitors, polycarboxylic acid scale inhibitors and dispersants, composite scale inhibitors, RO scale inhibitors, special scale inhibitors, concentrated scale inhibitors, phosphorus-free scale inhibitors, etc. Customization is welcome
chelation
The process of a complex with a cyclic structure formed by the central ion and two or more coordinating atoms of the same multidentate ligand that meets certain conditions is called chelation. The result of chelation is to make the scaling cations (such as ca2+, Mg2+, etc.) interact with the chelating agent to form a stable chelate, thereby preventing it from interacting with scaling anions (such as CO3 2-, SO42-, PO43-, and SiO32- etc.) contact, so that the probability of scaling is greatly reduced. Chelation is stoichiometric, such as 1 EDTA molecule chelates 1 divalent metal ion.
The chelating ability of the chelating agent can be expressed by the calcium chelation value. The chelating ability of common commercial water treatment agents (the mass fraction of the active components of the following agents is 50%, and the chelating ability is calculated as CaCO3): aminotrimethylenephosphonic acid (ATMP)-300 mg/g; Pentamethylenephosphonic acid (DTPMP)-450 mg/g; ethylenediaminetetraacetic acid (EDTA)-15om g; hydroxyethylene diphosphonic acid (HEDP)-45om expanded g. Equivalently, 1 mg of chelating agent can only chelate less than 0.5 mg of CaCO3 scale. To stabilize calcium and magnesium ions with a total hardness of smm0FL in the circulating water system, the required chelating agent is 1000m/L, which is economically unaffordable. It can be seen that the contribution of scale inhibitor chelation is only a small part of it. However, in low and medium hardness water, the chelation effect of the scale inhibitor still plays an important role.
Fold dispersion
The result of dispersion is to prevent mutual contact and agglomeration of fouling particles, thereby preventing fouling growth. The scale-forming particles can be calcium and magnesium ions, or they can be scale-forming particles composed of hundreds of CaCO3 and MgCO3 molecules, or dust, sediment or other water-insoluble substances. A dispersant is a polymer with a certain relative molecular mass (or degree of polymerization), and the level of dispersing performance is closely related to the size of the relative molecular mass (or degree of polymerization). If the polymerization is too low, the number of particles to be adsorbed and dispersed will be low, and the dispersion efficiency will be low; if the polymerization is too high, the number of particles to be adsorbed and dispersed will be too large, the water body will become turbid, and even flocs will be formed (the effect at this time is similar to that of flocculants). ). Dispersion is highly efficient compared to chelation. Experiments show that 1 mg of dispersant can make 10 to 100 mg of scale-forming particles stably exist in circulating water. In medium and high hardness water, the dispersing function of scale inhibitor plays a major role.
folded lattice distortion
When the hardness and alkalinity of the system are high, and the chelating agent and dispersing agent are not enough to completely prevent their precipitation, they will inevitably separate out. Without the presence of the dispersant, the scale growth would obey the general laws of crystal growth, and the scale formed would adhere strongly to the heat exchanger surface. If there is a sufficient amount of dispersant, since the scale-forming particles (composed of hundreds or thousands of CaCO3 molecules) are adsorbed and surrounded by the dispersant, the scale-forming particles are prevented from arranging on their regular lattice, so that the The generated dirt is soft and easy to be washed away by
use
There are many methods that can be used to evaluate the performance of scale inhibitors, such as the nucleation, growth, aggregation and adsorption process of crystals can be observed by scanning electron microscope. The growth of calcium carbonate crystals in the presence of scale inhibitors was studied by atomic force microscopy, and the inhibitory effect of scale inhibitors on the growth could be seen. X-ray diffraction method can be used to compare the degree of fineness of scale samples, the degree of crystal distortion and the change of crystal system in the presence of different scale inhibitors. The nucleation and growth kinetics of scale-forming substances in the presence of different scale inhibitors can be studied with a particle size distribution analyzer. However, most of these methods require the help of specialized instruments and can only be adopted by research institutions, and it is difficult to promote them in the majority of users and on-site evaluation.
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