Scale inhibition coating and scale inhibition coating

Abstract

The scale inhibition coating is prepared from the following raw materials in parts by dry weight: 40 to 55 parts of FOF scale inhibitor, 0.5 to 5 parts of scale inhibition dispersing agent and 45 to 225 parts of film forming component, the scale inhibition dispersing agent has dispersing performance and scale inhibition performance, and the film forming component is prepared from the following raw materials in parts by dry weight: 40 to 55 parts of FOF scale inhibitor, 0.5 to 5 parts of scale inhibition dispersing agent and 45 to 225 parts of film forming component. And the film-forming component is water-based film-forming resin containing a curing agent or water-based film-forming resin without the curing agent. The scale inhibition dispersant with scale inhibition performance and dispersion performance is compounded with the FOF scale inhibitor for use, the problem that the FOF scale inhibitor is difficult to disperse is solved, the scale inhibition dispersant is easily soluble, is adsorbed to the surface of the FOF scale inhibitor when the FOF scale inhibitor is dispersed, is coated with resin and also has slow-release capacity, so that a slow-release carrier is not needed, and the scale inhibition dispersant is equivalent to one-time ball milling; and the two scale inhibitors are compounded without mutual inhibition, so that the synergistic effect and scale inhibition can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of anti-scaling coatings, in particular to an anti-scaling paint and an anti-scaling coating. Background Art

[0002] Various underwater components used in the home are easily scaled when in contact with tap water for a long time. The main components are calcium carbonate and magnesium hydroxide, and may also contain calcium sulfate, etc., and its hazards are also well known. To solve this problem, coating the surface of the component with a scale-inhibiting coating is a simple and feasible method. This coating can be divided into physical scale inhibition and chemical scale inhibition according to the scale inhibition technology. Physical scale inhibition is generally a hydrophobic coating with low surface energy, which can slow down the adhesion and deposition of scale. However, a single physical scale inhibition coating can only slow down the adhesion and deposition of scale, and the amount of scale deposited under long-term use conditions will also be a lot. Chemical scale inhibition is to add scale inhibitors to the coating. The scale inhibitors will not be completely and densely coated by other components, so they can be released from the water / coating interface to form water-soluble complexes with calcium and magnesium ions in the water, thereby preventing scale formation.

[0003] FOF scale inhibitor is a product developed by the French National Institute of Scientific Research, whose main ingredient is organic phosphate. It has the advantages of good scale inhibition effect, green environmental protection, and strong stability. It is a slow-release scale inhibitor that can be directly made into tablets or other macroscopic objects without using a slow-release carrier, and then placed in a certain cavity. When the water flows through, it contacts the water body to achieve scale inhibition. It can be used in household water treatment scenarios such as water dispensers. However, FOF scale inhibitors are rarely used in coatings, mainly because FOF scale inhibitors are added in the form of powder to coatings with organic resins as film-forming materials, and then applied to make coatings. There is an obvious agglomeration problem in appearance. Even if the FOF scale inhibitor powder is first dispersed by high-speed shear, this problem still exists.

[0004] Ethylenediaminetetraacetate, nitrilotriacetate, ethylenediaminetetramethylenephosphonate, diethylenetriaminepenta(methylenephosphonic acid), 2-phosphonobutane-1,2,4-tricarboxylic acid, polyacrylic acid, polymer sulfonate, polyepoxysuccinate, etc. are commonly used scale inhibitors in industrial water systems such as boiler water, geothermal water, oil fields, and salt industry. They are usually used in a direct manner, and some studies have also used them in coatings. However, the solubility of the above scale inhibitors is relatively high. If they are added to the coating, they are released quickly due to their high solubility. Usually, a slow-release carrier is required, and the process is relatively complicated. Summary of the invention

[0005] The present invention aims to solve at least one of the above technical problems in the related art to a certain extent. To this end, the present invention provides an anti-scaling paint and an anti-scaling coating.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] The invention provides an anti-scaling coating, which comprises the following raw materials, measured in parts by dry weight: 45-55 parts of FOF scale inhibitor, 0.5-5 parts of scale inhibitor dispersant, and 45-225 parts of film-forming components, wherein the scale inhibitor dispersant has both dispersing performance and scale inhibition performance, and the film-forming component is an aqueous film-forming resin containing a curing agent or an aqueous film-forming resin without a curing agent; the anti-scaling coating is prepared by the following method: the scale inhibitor dispersant, the FOF scale inhibitor and water are mixed, the obtained slurry is ball-milled to obtain a scale inhibitor dispersed slurry, and the scale inhibitor dispersed slurry is mixed with the film-forming component to obtain the anti-scaling coating.

[0008] In some embodiments of the present invention, the scale inhibitor and dispersant is 1-5 parts.

[0009] In some embodiments of the present invention, the ball milling is performed using zirconium dioxide balls with a diameter of 0.8 mm-1 mm, and the ball milling time is 0.75 h-1.5 h.

[0010] In some embodiments of the present invention, the raw material further comprises a fluororesin dispersion; the fluororesin dispersion is at least one of a polytetrafluoroethylene dispersion or a polyperfluoroethylene propylene dispersion. The fluororesin dispersion is added to the water-based resin as a hydrophobic additive to enhance the hydrophobicity and obtain a scale inhibition effect.

[0011] In some embodiments of the present invention, the amount of the fluororesin dispersion is 1-40 parts by weight based on dry weight. When the amount of the fluororesin dispersion is small, a larger amount of FOF scale inhibitor can be added.

[0012] In some embodiments of the present invention, based on dry weight, the FOF scale inhibitor is 45-55 parts, the scale inhibitor dispersant is 0.5-5 parts, the film-forming component is 100-225 parts, and the fluororesin dispersion is 13-40 parts.

[0013] In some embodiments of the present invention, based on dry weight, the FOF scale inhibitor is 45-55 parts, the scale inhibitor dispersant is 0.5-5 parts, the film-forming component is 45-100 parts, and the fluororesin dispersion is 1-13 parts.

[0014] In some embodiments of the present invention, the fluororesin dispersion is added after the antiscalant dispersion slurry is obtained, and the antiscalant dispersion slurry, the fluororesin dispersion and the film-forming component are mixed to obtain the antiscalant coating.

[0015] In some embodiments of the present invention, the scale inhibitor and dispersant is at least one of polyepoxysuccinate, disodium ethylenediaminetetraacetate dihydrate, polyacrylic acid, ethylenediaminetetramethylenephosphonate or diethylenetriaminepenta(methylenephosphonic acid).

[0016] In some embodiments of the present invention, the water-based film-forming resin is selected from one of water-based epoxy resin, water-based polyurethane resin, water-based acrylic resin or water-based fluorocarbon resin. The water-based film-forming resin with better water resistance can be selected.

[0017] In some embodiments of the present invention, a pH regulator is also included, and the pH regulator is selected from at least one of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA), diethylenetriamine penta-methylene phosphoric acid or polyacrylic acid. Further, the pH regulator is added before ball milling, and the specific process is: mixing the scale inhibitor dispersant, pH regulator, FOF scale inhibitor and water, and the resulting slurry is ball milled. The pH of polyepoxy succinate is too high, which is easy to affect the curing performance of the coating, so the pH regulator is added to the polyepoxy succinate solution to adjust the pH to 7.5-8.5. In fact, PBTCA is rarely used as a pH regulator, but considering that it is also a scale inhibitor and has a good effect on calcium carbonate scale, this can also achieve the effect of one dose and two functions. It should be noted that the pH regulator is not necessary in the coating of the present invention. It is only used when the pH of the coating is high. For example, the scale inhibitor dispersant selects disodium ethylenediaminetetraacetic acid dihydrate or polyacrylic acid, and the pH is not high. At this time, the pH regulator can be added or not.

[0018] In some embodiments of the present invention, a defoamer is also included. The defoamer is a conventional auxiliary agent used to eliminate foam in the coating.

[0019] The present invention also provides a scale-inhibiting coating, which is prepared from the scale-inhibiting coating. The preparation method of the scale-inhibiting coating is as follows: applying the scale-inhibiting coating on a substrate, drying and curing, and soaking the cured coating in warm water at 25°C-40°C, and drying to obtain the scale-inhibiting coating. Polytetrafluoroethylene particles and polyperfluoroethylene propylene particles are insoluble in water, and are hardly released during the soaking process, and can maintain the hydrophobicity of the coating for a long time. However, when the addition amount is large (>5%, solid), the coating is easily foamed in hot water, that is, the wet adhesion of the coating is significantly reduced, which is mainly caused by the fluorinated surfactant contained in the fluororesin dispersion. The problem can be solved by post-treatment of soaking the coating in warm water after curing. Soaking in warm water can release the free fluorinated surfactant enriched on the surface of the coating first to reduce its influence. At this time, the temperature is low and water molecules are not easy to invade the coating. After release, the hydrophobicity of the coating is enhanced, and water molecules are not easy to invade in subsequent hot water tests. If it is directly soaked in hot water without soaking in warm water, hot water is more likely to invade the coating with the help of the fluorinated surfactant, causing foaming.

[0020] In some embodiments of the present invention, the soaking time is 12h-36h.

[0021] According to a preferred embodiment of the present invention, there are at least the following beneficial effects:

[0022] 1. The present invention uses a scale inhibitor dispersant with both scale inhibition and dispersibility in combination with a FOF scale inhibitor, solving the problem of the difficulty in dispersing the FOF scale inhibitor. The scale inhibitor dispersant itself is easily soluble and is adsorbed on the surface of the FOF scale inhibitor when it is dispersed. In addition, it is coated with resin and has a slow-release ability. Therefore, no slow-release carrier is required, which is equivalent to one ball milling, and the dispersion effect and slow-release ability are obtained, and the process is simple. The combination of the two scale inhibitors will not restrain each other, and synergistic scale inhibition can be achieved.

[0023] 2. Scale inhibitors and dispersants and FOF scale inhibitors are a group of compound scale inhibitors, which go beyond the usual meaning of compounding. Scale inhibitors and dispersants serve as dispersants for FOF scale inhibitors, while FOF scale inhibitors serve as slow-release carriers for scale inhibitors and dispersants. The two interact with each other and complement each other.

[0024] 3. The present invention adds fluororesin dispersion as a hydrophobic additive to the coating, and combines it with a slow-release chemical scale inhibitor to form a physical + chemical composite scale inhibition system with a long-lasting scale inhibition effect. Before the coating made by adding fluororesin dispersion is officially put into use, it is first soaked in mild warm water to release the surfactant in the coating, instead of being directly put into a hot water environment, which can greatly improve the adhesion of the coating in hot water.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments to clearly and completely describe the concept of the present invention and the technical effects produced, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0027] Information on raw materials involved in the examples and comparative examples:

[0028] Water-based epoxy resin: HDE3264-WB, solid content 64%, Shanghai Handai Chemical Co., Ltd.

[0029] Water-based epoxy curing agent: HDH6377-WB, solid content 50%, Shanghai Handai Chemical Co., Ltd.

[0030] Polytetrafluoroethylene (PTFE) dispersion: JF-4DCF, solid content 60%, Zhejiang Juhua Co., Ltd.;

[0031] FOF scale inhibitor: 100 mesh, Hangzhou Shangshan New Materials Co., Ltd.;

[0032] Polyepoxysuccinate (PESA) solution: solid content 40%, HO(C4H2O5M2) n H, n=2-10, M is Na + or H + , Shandong Taihe Science and Technology Co., Ltd.;

[0033] Disodium ethylenediaminetetraacetate dihydrate (EDTA·2Na·2H2O): chemical reagent;

[0034] Polyacrylic acid (PAA): molecular weight 3000-5000, solid content 50%, Tianjin Huasheng Chemical Reagent Co., Ltd.;

[0035] 2-Phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) solution: solid content 50%, Jinan Zhongbei Fine Chemical Co., Ltd.;

[0036] Dispersant: W750, anionic polymer, solid content 50%, Fok Technology (Suzhou) Co., Ltd.;

[0037] Defoaming agent: BYK-024, BYK Chemical, Germany.

[0038] Example 1

[0039] This example prepares a scale-inhibiting paint and a scale-inhibiting coating, and the specific process is as follows:

[0040] (1) Take 200 parts of deionized water, add 6.25 parts of polyepoxysuccinate (PESA) solution, add 0.125 parts of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) solution, stir evenly, add 50 parts of FOF scale inhibitor powder, and then use zirconium dioxide balls with a diameter of 1 mm for ball milling for 1 hour to obtain a scale inhibitor dispersion slurry;

[0041] (2) Add 201.9 parts of waterborne epoxy resin, 43.75 parts of polytetrafluoroethylene dispersion, 109.1 parts of waterborne epoxy curing agent and 0.2 parts of defoaming agent to the above-mentioned scale inhibitor dispersion slurry, stir evenly to obtain a scale inhibitor coating;

[0042] (3) On the polished and cleaned 304 stainless steel substrate (10×7 cm 2 ) was sprayed with anti-scaling coating and cured at 80°C for 1.5h. After curing, the dry weight of the coating on the area was 0.4534g;

[0043] (4) The cured coating is soaked in warm water at 35°C for 24 hours and then taken out and dried to obtain a scale-inhibiting coating.

[0044] Example 2

[0045] This example prepares a scale-inhibiting paint and a scale-inhibiting coating, and the specific process is as follows:

[0046] (1) Take 167 parts of deionized water, add 5.21 parts of polyepoxysuccinate (PESA) solution, add 0.104 parts of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) solution, stir evenly, add 41.7 parts of FOF scale inhibitor powder, and then use zirconium dioxide balls with a diameter of 1 mm for ball milling for 1 hour to obtain a scale inhibitor dispersion slurry;

[0047] (2) Add 201.9 parts of waterborne epoxy resin, 43.75 parts of polytetrafluoroethylene dispersion, 109.1 parts of waterborne epoxy curing agent and 0.2 parts of defoaming agent to the above-mentioned scale inhibitor dispersion slurry, stir evenly to obtain a scale inhibitor coating;

[0048] (3) On the polished and cleaned 304 stainless steel substrate (10×7 cm 2 ) was sprayed with anti-scaling coating and cured at 80°C for 1.5h. After curing, the dry weight of the coating on the area was 0.4412g;

[0049] (4) The cured coating is soaked in warm water at 35°C for 24 hours and then taken out and dried to obtain a scale-inhibiting coating.

[0050] Example 3

[0051] This example prepares a scale-inhibiting paint and a scale-inhibiting coating, and the specific process is as follows:

[0052] (1) Take 203.48 parts of deionized water, add 2.77 parts of disodium ethylenediaminetetraacetate dihydrate, add 0.125 parts of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) solution, stir evenly, add 50 parts of FOF scale inhibitor powder, and then use zirconium dioxide balls with a diameter of 1 mm for ball milling for 1 hour to obtain a scale inhibitor dispersion slurry;

[0053] (2) Add 201.9 parts of waterborne epoxy resin, 43.75 parts of polytetrafluoroethylene dispersion, 109.1 parts of waterborne epoxy curing agent and 0.2 parts of defoaming agent to the above-mentioned scale inhibitor dispersion slurry, stir evenly to obtain a scale inhibitor coating;

[0054] (3) On the polished and cleaned 304 stainless steel substrate (10×7 cm 2 ) was sprayed with anti-scaling coating and cured at 80°C for 1.5h. After curing, the dry weight of the coating on the area was 0.4478g;

[0055] (4) The cured coating is soaked in warm water at 35°C for 24 hours and then taken out and dried to obtain a scale-inhibiting coating.

[0056] Example 4

[0057] This example prepares a scale-inhibiting paint and a scale-inhibiting coating, and the specific process is as follows:

[0058] (1) Take 201.25 parts of deionized water, add 5 parts of polyacrylic acid (PAA) solution, add 0.125 parts of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) solution, stir evenly, add 50 parts of FOF scale inhibitor powder, and then use zirconium dioxide balls with a diameter of 1 mm for ball milling for 1 hour to obtain a scale inhibitor dispersion slurry;

[0059] (2) Add 201.9 parts of waterborne epoxy resin, 43.75 parts of polytetrafluoroethylene dispersion, 109.1 parts of waterborne epoxy curing agent and 0.2 parts of defoaming agent to the above-mentioned scale inhibitor dispersion slurry, stir evenly to obtain a scale inhibitor coating;

[0060] (3) On the polished and cleaned 304 stainless steel substrate (10×7 cm 2 ) was sprayed with anti-scaling coating and cured at 80°C for 1.5h. After curing, the dry weight of the coating on the area was 0.4584g;

[0061] (4) The cured coating is soaked in warm water at 35°C for 24 hours and then taken out and dried to obtain a scale-inhibiting coating.

[0062] Example 5

[0063] This example prepares a scale-inhibiting paint and a scale-inhibiting coating, and the specific process is as follows:

[0064] (1) Take 205.7 parts of deionized water, add 0.55 parts of disodium ethylenediaminetetraacetate dihydrate, stir evenly, add 50 parts of FOF scale inhibitor powder, and then use zirconium dioxide balls with a diameter of 1 mm for ball milling for 1 hour to obtain a scale inhibitor dispersion slurry;

[0065] (2) Add 83.25 parts of waterborne epoxy resin, 2 parts of polytetrafluoroethylene dispersion, 45 parts of waterborne epoxy curing agent and 0.1 parts of defoaming agent to the above-mentioned scale inhibitor dispersion slurry, stir evenly to obtain a scale inhibitor coating;

[0066] (3) On the polished and cleaned 304 stainless steel substrate (10×7 cm 2 ) was sprayed with anti-scaling coating and cured at 80°C for 1.5h. After curing, the dry weight of the coating on the area was 0.4433g.

[0067] Comparative Example 1

[0068] This comparative example prepares a scale-inhibiting paint and a scale-inhibiting coating. The difference from Example 1 is that the dispersant W750 is used to replace PESA, and the amount of the dispersant W750 is controlled to account for 5% of the FOF scale inhibitor in terms of solids, which is the same as the amount of PESA in Example 1. The specific process is:

[0069] (1) Take 200 parts of deionized water, add 5 parts of dispersant W750, add 0.125 parts of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) solution, stir evenly, add 50 parts of FOF scale inhibitor powder, and then use zirconium dioxide balls with a diameter of 1 mm for ball milling for 1 hour to obtain a scale inhibitor dispersion slurry;

[0070] Steps (2) to (4) are the same as those in Example 1.

[0071] Comparative Example 2

[0072] In this comparative example, an anti-scaling paint and an anti-scaling coating are prepared. The difference from Example 1 is that PBTCA is not added, and the other steps are the same as those of Example 1.

[0073] Comparative Example 3

[0074] This comparative example prepares an anti-scaling paint and an anti-scaling coating, which differs from Example 1 in that the warm water soaking operation in step (4) of Example 1 is omitted.

[0075] Comparative Example 4

[0076] This comparative example prepares a scale-inhibiting paint and a scale-inhibiting coating. The difference from Example 1 is that 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) is used to replace PESA. The specific process is as follows:

[0077] (1) Take 201.25 parts of deionized water by weight, add 5.125 parts of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) solution, stir evenly, add 50 parts of FOF scale inhibitor powder, and then use zirconium dioxide balls with a diameter of 1 mm for ball milling for 1 hour to obtain a scale inhibitor dispersion slurry;

[0078] Steps (2) to (4) are the same as those in Example 1.

[0079] Comparative Example 5

[0080] This comparative example is a 304 stainless steel substrate that has been polished and cleaned, and no anti-scaling coating is sprayed.

[0081] Test example

[0082] This test example tests the performance of the embodiment and the comparative example, and the test results are shown in Table 1. Wherein:

[0083] Contact angle: tested according to JC / T 2168-2013.

[0084] Hard water bath test (to test the amount of scale): prepare hard water with a hardness of about 350 mg / L (1L of tap water + 0.251g of calcium chloride dihydrate + 0.211g of magnesium sulfate heptahydrate + 0.27g of sodium bicarbonate + 0.08g of sodium chloride, the hardness of tap water is about 100mg / L, calculated as equivalent calcium carbonate), soak the sample in 1L of hard water at 50°C for 60 days (replace the hard water every 2 days), take it out and rinse away the attached liquid with slow water flow, clean the scale on the back of the steel plate, dry and weigh (recorded as m1), clean the scale on the coating surface, dry and weigh again (recorded as m2). Calculation of scale amount: (m1-m2) / sample single surface area (70cm 2 ).

[0085] Table 1 Test results

[0086]

[0087] As can be seen from Table 1, the amount of scale in Comparative Example 1 is significantly more than that in Example 1. This is because Comparative Example 1 uses an ordinary dispersant, which can only reduce the agglomeration of FOF scale inhibitors and improve the appearance of the coating, and has almost no contribution to the scale inhibition effect. Example 1 uses a scale inhibitor dispersant with scale inhibition + dispersing properties to improve the scale inhibition performance. The coating of Comparative Example 2 has a slight bubbling problem. This is because Comparative Example 2 does not add PBTCA, and the alkalinity of polyepoxysuccinate is too strong, which affects the adhesion of the coating. Comparative Example 3 was not soaked in warm water, and the contact angle before the hard water bath was significantly lower than that of Example 1, indicating that the hydrophobicity of the coating soaked in warm water has been enhanced. The coating of Comparative Example 3 has dense microbubbles in some areas after the water bath, and the coating of Example 1 does not bubble or fall off, indicating that warm water soaking can improve the wet adhesion of the coating. Comparative Example 4 selects PBTCA with poor dispersibility and compounded with FOF scale inhibitor. The coating has poor appearance before water bath and there are agglomerates. Due to the high solubility of PBTCA, the coating has poor water resistance. Severe blistering occurs after 5 days in water bath, and the contact angle and scale amount cannot be measured. In addition, compared with Examples 1-4, Example 5 uses a small amount of polytetrafluoroethylene dispersion and a large amount of FOF scale inhibitor. The experimental results show that the adhesion strength of scale is greater than that of Examples 1-4. Although the hydrophobicity of the coating is poor, the scale inhibition effect is still comparable to that of other examples. Without departing from the core premise of the present invention of using compounded scale inhibitors, a suitable formula can be selected according to the actual use scenario. In general, the scale inhibition coating of the present invention has good scale inhibition performance and lasting effect, and can meet the demand for scale inhibition of household underwater components.

[0088] The above is a detailed description of the embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A scale-inhibiting coating, characterized in that: The raw materials are as follows, measured in parts by dry weight: 40-55 parts of FOF scale inhibitor, 0.5-5 parts of scale inhibitor dispersant, and 45-225 parts of film-forming component, wherein the scale inhibitor dispersant has both dispersing performance and scale inhibition performance, and the film-forming component is an aqueous film-forming resin containing a curing agent or an aqueous film-forming resin without a curing agent; the scale inhibitor coating is prepared by the following method: the scale inhibitor dispersant, FOF scale inhibitor and water are mixed, the obtained slurry is ball-milled to obtain a scale inhibitor dispersed slurry, and the scale inhibitor dispersed slurry is mixed with the film-forming component to obtain the scale inhibitor coating.

2. The anti-scaling coating according to claim 1, characterized in that: The raw materials also include fluororesin dispersion; the fluororesin dispersion is at least one of polytetrafluoroethylene dispersion or polyperfluoroethylene-propylene dispersion.

3. The anti-scaling coating according to claim 2, characterized in that: The fluororesin dispersion is added after the antiscalant dispersion slurry is obtained, and the antiscalant dispersion slurry, the fluororesin dispersion and the film-forming component are mixed to obtain the antiscalant coating.

4. The anti-scaling coating according to claim 1, characterized in that: The scale inhibitor and dispersant is at least one of polyepoxysuccinate, disodium ethylenediaminetetraacetate dihydrate, polyacrylic acid, ethylenediaminetetramethylenephosphonate or diethylenetriaminepenta(methylenephosphonic acid).

5. The anti-scaling coating according to claim 1, characterized in that: The water-based film-forming resin is selected from one of water-based epoxy resin, water-based polyurethane resin, water-based acrylic resin or water-based fluorocarbon resin.

6. The anti-scaling coating according to claim 1, characterized in that: The invention also comprises a pH regulator, wherein the pH regulator is selected from at least one of 2-phosphonobutane-1,2,4-tricarboxylic acid, diethylenetriamine penta-methylenephosphonic acid or polyacrylic acid.

7. The anti-scaling coating according to claim 1, characterized in that: Also includes defoamers.

8. A scale-inhibiting coating, characterized in that: The anti-scaling coating is prepared from the anti-scaling coating according to any one of claims 1 to 7.

9. A scale-inhibiting coating, characterized in that: The scale-inhibiting coating is prepared by the scale-inhibiting coating described in claim 2. The preparation method of the scale-inhibiting coating is as follows: applying the scale-inhibiting coating on a substrate, drying and curing it, immersing the cured coating in warm water at 25°C-40°C, and drying it to obtain the scale-inhibiting coating.

10. The anti-scaling coating according to claim 9, characterized in that: The soaking time is 12h-36h.

Images