Antifouling slurry, its preparation method and application

Abstract

The application discloses a kind of scale inhibiting slurry and its preparation method and application.The scale inhibiting slurry of the application includes super-hydrophobic slow-release surface layer slurry, the super-hydrophobic slow-release surface layer slurry includes the raw material of matrix material I, hollow mesoporous material and scale inhibitor I loaded on the hollow mesoporous material.The surface layer slurry of the application contains hollow mesoporous material and scale inhibitor I loaded on the hollow mesoporous material, hollow mesoporous material can be used to construct the micro-nano structure of the coating formed by surface layer slurry, the coating formed by surface layer slurry is super-hydrophobic slow-release surface layer, scale inhibitor I uses hollow mesoporous material as slow-release carrier, so that the scale inhibiting effect of super-hydrophobic slow-release surface layer is strong and persistent, and the surface layer is super-hydrophobic, so that scale is extremely difficult to deposit on the surface of super-hydrophobic slow-release surface layer, therefore, the coating formed by scale inhibiting slurry in the application not only has physical scale inhibiting technology, but also contains chemical scale inhibiting technology, scale inhibiting effect is good while being persistent.

Description

Technical Field

[0001] This invention belongs to the field of scale inhibitor materials technology, specifically relating to a scale inhibitor slurry, its preparation method, and its application. Background Technology

[0002] Scale inhibitor coatings are commonly used to solve or mitigate scaling problems in pipelines and pumps in scenarios such as heat exchangers, geothermal water extraction, and oilfield production. In fact, various underwater components in household appliances also encounter similar scaling problems, such as the valve cores of shower heads and faucets. Using paint to create scale inhibitor coatings is a simple and feasible method. Based on scale inhibition technology, scale inhibitor coatings can be divided into physical scale inhibitor layers and chemical scale inhibitor layers. The former is generally a hydrophobic coating with low surface energy, which can slow down the adhesion and deposition of scale; the latter usually involves adding scale inhibitors to the coating. The scale inhibitors are released from the water / coating interface and form water-soluble complexes with calcium and magnesium particles in the water, thereby preventing scale formation. However, conventional physical and chemical scale inhibitor layers have relatively poor scale inhibition effects, which to some extent limits the application of scale inhibitor coatings. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a scale-inhibiting slurry, the resulting coating of which has the characteristic of good scale inhibition effect.

[0004] This invention proposes a method for preparing scale inhibitor slurry.

[0005] This invention proposes a method for using scale inhibitor slurry.

[0006] The present invention also proposes a scale-inhibiting coating.

[0007] The present invention also proposes a method for preparing a scale-inhibiting coating.

[0008] The present invention also proposes a valve core.

[0009] The present invention also proposes a bathroom fixture.

[0010] In a first aspect, the present invention provides a scale inhibitor slurry comprising a superhydrophobic slow-release surface layer slurry, wherein the surface layer slurry comprises a raw material of a matrix material I, a hollow mesoporous material, and a scale inhibitor I loaded on the hollow mesoporous material.

[0011] The scale-inhibiting slurry according to embodiments of the present invention has at least the following beneficial effects:

[0012] In this invention, the superhydrophobic slow-release surface slurry contains a hollow mesoporous material and a scale inhibitor I loaded on the hollow mesoporous material. The hollow mesoporous material can be used to construct the micro-nano structure of the coating formed by the surface slurry. The coating formed by the surface slurry is a superhydrophobic slow-release surface layer. The scale inhibitor I uses a hollow mesoporous material as a slow-release carrier, which makes the scale inhibition effect of the superhydrophobic slow-release surface layer long-lasting. Moreover, the superhydrophobicity of the surface layer makes it extremely difficult for scale to deposit on the surface of the superhydrophobic slow-release surface layer. Therefore, the coating formed by the surface slurry in this invention not only has physical scale inhibition technology but also contains chemical scale inhibition technology, resulting in good and long-lasting scale inhibition effect.

[0013] In some embodiments of the present invention, the raw materials for preparing the surface slurry include the raw materials of matrix material I, hollow mesoporous material, modifier I, and scale inhibitor I. Optionally, the mass ratio of the raw materials of matrix material I, hollow mesoporous material, modifier I, and scale inhibitor I is (1.5-35):(1-10):(0.4-15):(0.1-4.8).

[0014] In some embodiments of the present invention, the scale inhibitor I is loaded onto the hollow mesoporous material at a rate of 0.05-0.8 g per gram of hollow mesoporous material.

[0015] In some embodiments of the present invention, the scale inhibitor I comprises at least one of an organic acid having a tertiary amino group or a salt of said organic acid.

[0016] In some embodiments of the present invention, the organic acid includes at least one of ethylenediaminetetraacetic acid (EDTA), aminotriacetic acid (NTA), diethylenetriaminepentaacetic acid (DTPA), ethylenediaminetetramethylphosphonic acid (EDTMP), aminotrimethylenephosphonic acid (ATMP), or diethylenetriaminepentamethylenephosphonic acid (DTPMPA).

[0017] In some embodiments of the present invention, the salt of the organic acid includes at least one of the sodium salt or potassium salt of the organic acid.

[0018] In some embodiments of the present invention, the scale inhibitor I comprises disodium ethylenediaminetetraacetate (EDTA disodium salt). EDTA disodium salt is a scale inhibitor with high solubility and can be adsorbed by hollow mesoporous materials.

[0019] In some embodiments of the present invention, the hollow mesoporous material includes at least one of hollow mesoporous nanoparticles, carbon nanotubes, or halloysite.

[0020] In some embodiments of the present invention, the hollow mesoporous nanoparticles include at least one of hollow mesoporous silica nanospheres, hollow mesoporous alumina, hollow mesoporous zinc oxide, hollow mesoporous titanium dioxide, or hollow mesoporous silicon carbide.

[0021] In some embodiments of the present invention, the hollow mesoporous nanoparticles may be hollow mesoporous nanospheres.

[0022] In some embodiments of the present invention, the particle size of the hollow mesoporous material is 10-500 nm, such as 80-200 nm.

[0023] In some embodiments of the present invention, the modifier I includes at least one of a hydrophobic modifier, tetraethyl silicate, or methyltriethoxysilane. Specifically, after hydrolysis, tetraethyl silicate dehydrates and condenses with hydroxyl groups (silanol groups) on the surface of a hollow mesoporous material (such as silica) to form a semi-encapsulation, increasing the bonding strength between particles.

[0024] In some embodiments of the present invention, the hydrophobic modifier includes fluorosilanes.

[0025] In some embodiments of the present invention, the fluorosilane includes at least one of heptadecafluorodecyltrimethoxysilane, dodecyltrimethoxysilane, octadecyltrimethoxysilane, octadecyltrichlorosilane, tridecafluorooctyltrimethoxysilane, heptadecafluorodecyltrichlorosilane, heptadecafluorodecyltriethoxysilane, or a fluorinated acrylic resin.

[0026] Fluorosilanes are hydrophobic modifiers. Their hydrolyzed silanol groups dehydrate and condense with the hydroxyl groups (silanol groups) on the surface of hollow mesoporous materials (such as silica) to form a strong chemical graft.

[0027] In some embodiments of the present invention, the raw materials for preparing the surface layer slurry also include nanoparticles.

[0028] In some embodiments of the present invention, the nanoparticles include at least one of silicon dioxide, aluminum oxide, zinc oxide, titanium dioxide, or silicon carbide. For example, the modified nanoparticles may be fumed silica.

[0029] In some embodiments of the present invention, the particle size of the nanoparticles is 1-200 nm, such as 8-30 nm.

[0030] In some embodiments of the present invention, the raw materials for preparing the surface slurry further include catalyst I. Optionally, the mass ratio of the hollow mesoporous material to catalyst I is (2-6):(0.1-20).

[0031] In some embodiments of the present invention, the catalyst I comprises sodium methylsilicate.

[0032] Sodium methylsilicate can enhance the water resistance of superhydrophobic slow-release coatings, and can act as a catalyst for the hydrolysis and dehydration condensation of fluorosilanes (such as heptadecafluorodecyltrimethoxysilane) and tetraethyl silicate, without the odor of ammonia.

[0033] In some embodiments of the present invention, the raw materials for preparing the surface layer slurry further include solvent I.

[0034] In some embodiments of the present invention, solvent I includes at least one of ethanol or isopropanol.

[0035] In some embodiments of the present invention, the raw materials of the matrix material I include, but are limited to, resin raw materials that can be cured at room temperature, solvent-based resin raw materials, etc.

[0036] In some embodiments of the present invention, the raw material of the matrix material I includes at least one of hydroxyl-containing resin, amino resin, or methoxyl-containing resin.

[0037] In some embodiments of the present invention, the raw materials of the matrix material I include acrylic resin I and amino resin I.

[0038] In the above embodiments, acrylic resin I is the main resin, and amino resin I acts as a curing agent, and the two can undergo a cross-linking reaction.

[0039] In some embodiments of the present invention, the raw materials of the matrix material I further include coupling agent I.

[0040] Through the above embodiments, when the nanoparticles and / or mesoporous carrier include silica, under the action of coupling agent I, the raw material of matrix material I can react with coupling agent I to enhance the bonding strength with silica, such as crosslinking with silanol groups. Optionally, various suitable coupling agents I can be selected according to the resin raw material.

[0041] In some embodiments of the present invention, the coupling agent I includes at least one of KH550 or KH560.

[0042] Through the above embodiments, the coupling agent I, after hydrolysis, undergoes dehydration condensation with the silanol groups on the surface of silica to form chemical grafts. The amino groups at its ends can react with the matrix resin to form chemical bonds, thereby enhancing the compatibility and bonding strength between silica and the matrix resin.

[0043] In some embodiments of the present invention, the mass ratio of the hollow mesoporous material, nanoparticles, fluorosilane, tetraethyl silicate, catalyst I, acrylic resin I, and amino resin I in the raw materials for preparing the surface slurry is (2-6):(0.25-4):(2-10):(0.4-4):(0.1-20):(1-25):(0.5-10). Optionally, the mass ratio of the hollow mesoporous material to scale inhibitor I is (2-6):(0.1-4.8). Optionally, the mass ratio of acrylic resin I, amino resin I, and coupling agent I is (1-25):(0.5-10):(0-2).

[0044] In some embodiments of the present invention, the surface slurry, by weight, comprises 1-10 parts of hollow mesoporous material loaded with scale inhibitor I, 0.25-4 parts of nanoparticles, 5-200 parts of solvent I, and 1.5-35 parts of raw material of matrix material I. Optionally, by weight percentage, the surface slurry comprises 0.5%-40% of hollow mesoporous material loaded with scale inhibitor I, 0.09%-30% of nanoparticles, 0.5%-95% of solvent I, and 0.6%-78% of raw material of matrix material I. Optionally, the hollow mesoporous material is a hollow mesoporous material modified with modifier I, and the nanoparticles are nanoparticles modified with modifier I. Optionally, by mass percentage, the surface layer slurry comprises 1%-10% of a hollow mesoporous material loaded with scale inhibitor I, 0.1%-5% of nanoparticles, 60%-90% of solvent I, and 5%-20% of matrix material I. Optionally, by mass percentage, the surface layer slurry further comprises 0-2% of coupling agent I.

[0045] In some embodiments of the present invention, the surface slurry comprises 2-6 parts by weight of a hollow mesoporous material loaded with scale inhibitor I.

[0046] In some embodiments of the present invention, the scale inhibitor slurry further includes a scale inhibitory slow-release inner layer slurry, the inner layer slurry comprising the raw material of matrix material II and scale inhibitor II.

[0047] In some embodiments of the present invention, the scale inhibitor II comprises at least one of an organophosphonate scale inhibitor, an amide-containing polymer scale inhibitor, or a sulfonic acid-containing polymer scale inhibitor. For example, it may be an acrylic resin or an amino resin, etc. Optionally, the organophosphonate scale inhibitor is a phosphonate polymer scale inhibitor.

[0048] In some embodiments of the present invention, the particle size of the scale inhibitor II is 200-3000 mesh, such as 800-3000 mesh.

[0049] In some embodiments of the present invention, the matrix material II may be the same as or different from the matrix material I. Optionally, the raw material of the matrix material II may be the same as or different from the raw material of the matrix material I.

[0050] In some embodiments of the present invention, the raw materials of the matrix material II include acrylic resin II, amino resin II, and coupling agent II.

[0051] In the above embodiments, acrylic resin II is the main resin, and amino resin II acts as a curing agent; the two can undergo a cross-linking reaction. When the micron-sized particles include silica, under the action of coupling agent II, acrylic resin II and amino resin II can react with coupling agent II to enhance the bonding strength with silica, such as by cross-linking with silanol groups. Optionally, various suitable coupling agents II can be selected according to the resin raw materials.

[0052] In some embodiments of the present invention, the coupling agent II includes at least one of KH550 or KH560.

[0053] Through the above embodiments, the silanol groups after hydrolysis of coupling agent II dehydrate and condense with the silanol groups on the surface of silica to form chemical grafts. The amino groups at its ends can react with the resin to form chemical bonds, thereby enhancing the compatibility and bonding strength between silica and resin.

[0054] In some embodiments of the present invention, the inner layer slurry further includes micron-sized particles. These micron-sized particles not only enhance the mechanical strength of the scale-inhibiting and slow-release inner layer formed by the inner layer slurry, but also, together with the scale inhibitor II and the superhydrophobic slow-release surface layer in the scale-inhibiting and slow-release inner layer, construct a micro / nano structure.

[0055] In some embodiments of the present invention, the micron particles include at least one of silicon dioxide, aluminum oxide, zinc oxide, titanium dioxide, or silicon carbide.

[0056] In some embodiments of the present invention, the particle size of the micron particles is 200-3000 mesh, such as 800-3000 mesh.

[0057] In some embodiments of the present invention, the inner layer slurry further includes a leveling agent.

[0058] In some embodiments of the present invention, the leveling agent includes at least one of BYK-333, TEGO-410, or DC-57. The leveling agent can promote leveling, resulting in a better film appearance.

[0059] In some embodiments of the present invention, the inner layer slurry further includes scale inhibitor I.

[0060] In some embodiments of the present invention, the raw materials for preparing the inner layer slurry include scale inhibitor II, micron-sized particles, solvent II, raw materials for the matrix material II, and a leveling agent. Optionally, the raw materials for preparing the inner layer slurry further include scale inhibitor I.

[0061] In some embodiments of the present invention, the inner layer slurry, by weight, comprises 1-60 parts of scale inhibitor II, 0-2 parts of scale inhibitor I, 1-60 parts of micron-sized particles, 0-0.5 parts of leveling agent, 50-250 parts of solvent II, and 35-1255 parts of raw material for matrix material II. Optionally, by weight percentage, the inner layer slurry comprises 0.06%-40% of scale inhibitor II, 0-3% of scale inhibitor I, 0.06%-40% of micron-sized particles, 0-0.6% of leveling agent, 3.5%-87% of solvent II, and 8%-96% of raw material for matrix material II. Further optionally, the inner layer slurry comprises, by mass percentage, 0.1%-15% scale inhibitor II, 0-0.5% scale inhibitor I, 2%-15% micron particles, 0-0.2% leveling agent, 30%-60% solvent II and 40%-60% matrix material II.

[0062] In a second aspect, the present invention provides a method for preparing a scale inhibitor slurry, comprising preparing a superhydrophobic slow-release surface slurry, specifically comprising: loading a scale inhibitor I onto a hollow mesoporous material and mixing it with the raw materials of a matrix material I to obtain a surface slurry.

[0063] In some embodiments of the present invention, the raw materials for preparing the scale inhibitor slurry include solvent I. Optionally, solvent I includes solvent I-1 and solvent I-2.

[0064] In some embodiments of the present invention, scale inhibitor I is loaded onto a hollow mesoporous material, mixed with solvent I-1, a dispersion of nanoparticles, modifier I, and catalyst I. After centrifugation to remove the supernatant, mixture I is obtained, which is then mixed with the raw material of matrix material I and solvent I-2 to obtain the surface slurry. Optionally, solvent I-1 and solvent I-2 can be the same or different. Optionally, mixture I is a gel.

[0065] In some embodiments of the present invention, the steps for preparing the surface slurry specifically include:

[0066] Sa-1, take a mixture of scale inhibitor I, hollow mesoporous material and dispersing solvent A, disperse and adsorb to obtain a dispersion of hollow mesoporous material loaded with scale inhibitor I, separate and wash to obtain the washing liquid and hollow mesoporous material loaded with scale inhibitor I.

[0067] The nanoparticles were mixed with dispersion solvent B and dispersed to obtain a dispersion of nanoparticles.

[0068] Sa-2 is prepared by mixing the hollow mesoporous material of the scale inhibitor I, solvent I-1, dispersion of nanoparticles, modifier I, and catalyst I, centrifuging to remove the supernatant to obtain mixture I, and then mixing it with the raw material of matrix material I and solvent I-2 to obtain the surface slurry.

[0069] In some embodiments of the present invention, in step Sa-1, the loading amount of scale inhibitor I on the hollow mesoporous material is 0.05-0.8g per gram of hollow mesoporous material.

[0070] In some embodiments of the present invention, in step Sa-1, the dispersion is carried out at a temperature T1, optionally 15℃≤T1≤35℃, and further optionally 20℃≤T1≤30℃.

[0071] Scale inhibitor I loaded onto hollow mesoporous material mainly undergoes physical adsorption. Under temperature T1, it not only allows scale inhibitor I to dissolve better in the mixture, but also further enhances the adsorption effect of scale inhibitor I on hollow mesoporous material.

[0072] In some embodiments of the present invention, in step Sa-1, the dispersing solvent A comprises water; and / or, the dispersing solvent B comprises at least one of ethanol or isopropanol.

[0073] In some embodiments of the present invention, step Sa-1 further includes mixing scale inhibitor I with hollow mesoporous material and dispersing solvent A to obtain the mixture. Optionally, the ratio of scale inhibitor I to hollow mesoporous material and dispersing solvent A in the mixture is (0.002-0.1) mol:(1-10) g:(50-200) g; for example, it can be (0.01-0.02) mol:(2-6) g:(90-150) g.

[0074] In some embodiments of the present invention, in step Sa-1, an aqueous solution of scale inhibitor I is mixed with a hollow mesoporous material, and then dispersed and adsorbed to obtain a dispersion of the hollow mesoporous material loaded with scale inhibitor I.

[0075] In some embodiments of the present invention, in step Sa-1, the mass percentage of the nanoparticles in the dispersion of the nanoparticles is 0.2%-10%.

[0076] In some embodiments of the present invention, in step Sa-1, the mass ratio of the hollow mesoporous material to the nanoparticles is (2-6):(0.25-4); or optionally (2-4):(1-4).

[0077] In some embodiments of the present invention, step Sa-1 specifically includes the following operations:

[0078] Sa-1-1: Mix the aqueous solution of scale inhibitor I with the hollow mesoporous material, ultrasonically disperse, and stir to obtain a dispersion of hollow mesoporous material loaded with scale inhibitor I.

[0079] Sa-1-2, the dispersion obtained in step Sa-1-1 is centrifuged to obtain supernatant I and sedimentation mixture I;

[0080] Sa-1-3, after washing the sedimentation mixture I, yields a hollow mesoporous material loaded with scale inhibitor I and the washing liquid.

[0081] In some embodiments of the present invention, in step Sa-1-1, the concentration of scale inhibitor I in the aqueous solution is 0.1-0.2 mol / L, such as 0.13-0.17 mol / L, and further such as 0.14-0.16 mol / L.

[0082] In some embodiments of the present invention, in step Sa-1-1, the ratio of the aqueous solution of the scale inhibitor I to the amount of the hollow mesoporous material is 100mL:(2-6)g, or it can be 100mL:(2-4)g.

[0083] In some embodiments of the present invention, in step Sa-1-1, the ultrasonic dispersion time is 2-60 min, such as 5-20 min.

[0084] In some embodiments of the present invention, in step Sa-1-1, the stirring and dispersion method is to use a mixer with a dispersion disc for high-speed stirring and dispersion. Optionally, the inner diameter of the container is 8-12 cm, and the diameter of the dispersion disc is 5.5-6.5 cm. Further optionally, the high-speed stirring and dispersion includes: first stirring at a stirring speed of 500-3000 rpm for 0.2-2 hours, then reducing the stirring speed to 100-400 rpm and continuing stirring for 4-24 hours.

[0085] In some embodiments of the present invention, in step Sa-1-2, the centrifugation step of the dispersion is performed with a centrifugation speed of 2000-8000 rpm and a centrifugation time of 1-10 min.

[0086] In some embodiments of the present invention, in step Sa-1-2, the concentration of scale inhibitor I contained in the supernatant I is calibrated, and scale inhibitor I is added to the supernatant I so that the concentration of scale inhibitor I in the resulting solution is the same as the concentration of scale inhibitor I in the aqueous solution of scale inhibitor I in step Sa-1-1. The resulting solution is then used as the aqueous solution of scale inhibitor I mixed with the hollow mesoporous material in step Sa-1-1.

[0087] In some embodiments of the present invention, in step Sa-1-3, the sedimentation mixture I is washed sequentially with water and ethanol.

[0088] In some embodiments of the present invention, in steps Sa-1-3, the sedimentation mixture I is washed with water for the first time, and after centrifugation to remove the supernatant A, water is added for the second washing, and after centrifugation to remove the supernatant B, ethanol is added for the third washing, and after centrifugation to remove the supernatant C, the hollow mesoporous material loaded with scale inhibitor I is obtained. The washing liquids are supernatant A, supernatant B, and supernatant C. Optionally, supernatant A, supernatant B, and supernatant C are collected and stored separately.

[0089] In some embodiments of the present invention, in the washing step of step Sa-1-3 of the sedimentation mixture I, the mass ratio of water used for the first washing, water used for the second washing, ethanol used for the third washing, and the hollow mesoporous material is (10-60):(10-60):(10-60):(1-10), or optionally, (30-50):(30-50):(30-50):(2-6).

[0090] In some embodiments of the present invention, step Sa-2 specifically includes the following operations:

[0091] Sa-2-1, a mixture of hollow mesoporous material loaded with scale inhibitor I and solvent I-1 is prepared, and then mixed with a dispersion of nanoparticles, modifier I and catalyst I to obtain mixture A;

[0092] Sa-2-2, the mixture A is centrifuged to remove the supernatant II, resulting in mixture I. The raw material of matrix material I and solvent I-2 are added and mixed to obtain the surface slurry.

[0093] In some embodiments of the present invention, step Sa-2-1, after mixing the hollow mesoporous material of the scale inhibitor I with solvent I-1, further includes the step of adding catalyst I dropwise. Specifically, the hollow mesoporous material of the scale inhibitor I is mixed with solvent I-1, a dispersion of nanoparticles and modifier I are added, catalyst I is added dropwise, and the mixture is stirred to obtain mixture A.

[0094] In some embodiments of the present invention, the mass ratio of the hollow mesoporous material to solvent I-1 and solvent I-2 is (1-10):(50-300):(5-200), or optionally, (2-6):(60-200):(10-120).

[0095] In some embodiments of the present invention, in step Sa-2-1, the hollow mesoporous material of the scale inhibitor I is taken, ethanol is added, and the mixture is stirred for 0.1-2 hours. Then, a dispersion of nanoparticles, heptadecafluorodecyltrimethoxysilane, and tetraethyl silicate are added, and an aqueous solution of sodium methylsilicate is added dropwise. The mixture is stirred for 1-10 hours to obtain mixture A.

[0096] In some embodiments of the present invention, in step Sa-2-1, the mass ratio of ethanol, nanoparticle dispersion, heptadecyltrimethoxysilane, tetraethyl silicate, and sodium methylsilicate aqueous solution added to the hollow mesoporous material loaded with scale inhibitor I to the hollow mesoporous material is (60-200):(5-80):(2-10):(0.4-4):(1-20):(1-10). Optionally, the mass percentage of sodium methylsilicate in the sodium methylsilicate aqueous solution is 5-35%.

[0097] In some embodiments of the present invention, in step Sa-2-2, the mixture A is centrifuged to remove the supernatant II, and solvent I-2, acrylic resin I, and amino resin I are added and mixed to obtain a surface slurry.

[0098] In some embodiments of the present invention, in step Sa-2-2, the mass ratio of solvent I-2, acrylic resin I, and amino resin I is (10-120):(1-25):(0.5-10).

[0099] In some embodiments of the present invention, step Sa-1, the step of preparing the dispersion of nanoparticles specifically includes: taking nanoparticles and dispersion solvent B, stirring and mixing to obtain the dispersion of nanoparticles. Optionally, the stirring and mixing is carried out using a mixer with a dispersion disc at high speed, wherein the inner diameter of the container is 8-12 cm and the diameter of the dispersion disc is 5.5-6.5 cm. Further optionally, the high-speed stirring and dispersion includes: stirring at a stirring speed of 500-5000 rpm for 0.2-5 hours.

[0100] In some embodiments of the present invention, the preparation method further includes preparing a scale inhibitory slow-release inner layer slurry. The step of preparing the inner layer slurry specifically includes: mixing the scale inhibitor II, the raw material of the matrix material II, and the solvent II to obtain the inner layer slurry.

[0101] In some embodiments of the present invention, solvent II includes solvent II-1 and solvent II-2. The steps for preparing the inner layer slurry specifically include: mixing scale inhibitor II, micron-sized particles, and solvent II-1, and then mixing them with the raw material of matrix material II, solvent II-2, and leveling agent to obtain the inner layer slurry. Optionally, solvent II-1 and solvent II-2 may be the same or different, and / or the mass ratio of solvent II-1 to solvent II-2 is (0.1-50):1.

[0102] In some embodiments of the present invention, solvent II comprises the washing solution obtained in step Sa-1; and / or, solvent II comprises at least one of ethanol or isopropanol. Optionally, solvent II-1 comprises the washing solution; optionally, the washing solution contains scale inhibitor I. Further optionally, the concentration of scale inhibitor I in the washing solution is 0.0001-0.015 g / g, such as 0.0001-0.01 g / g.

[0103] In some embodiments of the present invention, the mass ratio of scale inhibitor II, micron particles, solvent II, and leveling agent is (0-60):(0-60):(50-250):(0-0.5), or optionally (1-60):(1-60):(80-150):(0.1-0.5).

[0104] In some embodiments of the present invention, the raw materials of the matrix material II include acrylic resin II, amino resin II and coupling agent II, and the mass ratio of the scale inhibitor II to the acrylic resin II, amino resin II and coupling agent II is (0-60):(30-1000):(6-250):(0.5-4); or optionally (1-60):(50-1000):(10-250):(1-4).

[0105] In some embodiments of the present invention, solvent II includes solvent II-1 and solvent II-2, and the steps for preparing the inner layer slurry specifically include:

[0106] Sb-1, take scale inhibitor II, micron particles and solvent II-1, mix them to obtain mixture II;

[0107] Sb-2, the mixture II is mixed with solvent II-2, the raw material of matrix material II, and leveling agent to obtain the inner layer slurry.

[0108] In some embodiments of the present invention, in step Sb-1, the mixing method includes: stirring and mixing. Optionally, the stirring and mixing is to use a mixer with a dispersing disc for high-speed stirring and dispersion, wherein the inner diameter of the container is 8-12 cm and the diameter of the dispersing disc is 5.5-6.5 cm. More optionally, the high-speed stirring and dispersion includes: stirring at a stirring speed of 100-5000 rpm for 0.2-5 hours.

[0109] In some embodiments of the present invention, in step Sb-1, solvent II-1 includes supernatant A, supernatant B, and supernatant C. Optionally, solvent II-1 includes supernatant A, supernatant B, supernatant C, ethanol, and isopropanol.

[0110] In some embodiments of the present invention, in step Sb-1, scale inhibitor II, micron-sized particles, supernatant A, supernatant B, supernatant C, ethanol, and isopropanol are taken and mixed to obtain the mixture II. Optionally, the mass ratio of scale inhibitor II, micron-sized particles, supernatant A, supernatant B, supernatant C, ethanol, and isopropanol is (0-60):(0-60):(10-30):(10-30):(10-30):(20-40):(1-20), or optionally (1-60):(1-60):(15-25):(15-25):(15-25):(20-30):(1-10).

[0111] In some embodiments of the present invention, in step Sb-1, scale inhibitor II, micron-sized particles, ethanol, isopropanol, supernatant A, supernatant B, and supernatant C are taken and dispersed at high speed using a mixer with a dispersion disc. After stirring at a speed of 1000-3000 rpm for 0.2-2 hours, the stirring speed is reduced to 100-500 rpm, solvent II-2, acrylic resin II, amino resin II, coupling agent II, and leveling agent are added, and the mixture is stirred for 5-30 minutes to obtain the inner layer slurry.

[0112] A third aspect of the present invention provides a method for using the aforementioned scale-inhibiting slurry, comprising the following steps: applying a scale-inhibiting and slow-release inner layer slurry to the surface of the object to be coated, pre-curing it, and then applying a superhydrophobic slow-release top layer slurry to the pre-cured surface of the inner layer slurry, followed by curing. This forms a layered scale-inhibiting and slow-release inner layer and a superhydrophobic slow-release top layer on the surface of the object to be coated.

[0113] In some embodiments of the present invention, the pre-curing temperature is 80-180°C, and / or the pre-curing time is 2-60 min.

[0114] In some embodiments of the present invention, the curing temperature is 120-250°C, and / or the curing time is 10-120 min.

[0115] In a fourth aspect, the present invention provides a scale inhibitor coating comprising a superhydrophobic slow-release surface layer, wherein the superhydrophobic slow-release surface layer comprises a matrix material I, a mesoporous carrier, and a scale inhibitor I loaded on the mesoporous carrier.

[0116] The scale-inhibiting coating according to embodiments of the present invention has at least the following beneficial effects:

[0117] The superhydrophobic slow-release surface layer of the scale-inhibiting coating of this invention contains a mesoporous carrier loaded with scale inhibitor I. The use of a mesoporous carrier as the slow-release carrier for scale inhibitor I results in a long-lasting scale-inhibiting effect. Furthermore, the superhydrophobic surface layer makes it extremely difficult for scale to deposit on its surface. Therefore, the scale-inhibiting coating of this invention not only incorporates physical scale-inhibiting technology but also chemical scale-inhibiting technology, achieving both excellent and long-lasting scale-inhibiting effects. In addition, the mesoporous carrier not only acts as a slow-release carrier but also contributes to the construction of the micro / nano structure of the superhydrophobic slow-release surface layer, significantly improving its hydrophobic properties.

[0118] In some embodiments of the present invention, the thickness of the superhydrophobic slow-release surface layer is 0.5-100 μm.

[0119] In some embodiments of the present invention, the thickness of the superhydrophobic slow-release surface layer is 2-20 μm.

[0120] In some embodiments of the present invention, the contact angle between the superhydrophobic slow-release surface layer and water is 150° or more, such as 150°-170°.

[0121] In some embodiments of the present invention, the scale inhibitor I includes, but is not limited to, the scale inhibitor I described in any of the first aspects of the present invention. Optionally, the scale inhibitor I includes disodium ethylenediaminetetraacetate (EDTA disodium salt). EDTA disodium salt is a scale inhibitor with high solubility and can be adsorbed by mesoporous carriers.

[0122] In some embodiments of the present invention, the scale inhibitor I is loaded onto the mesoporous carrier at a rate of 0.05-0.8 g per gram of mesoporous carrier.

[0123] In some embodiments of the present invention, the superhydrophobic slow-release surface layer has a micro / nano structure.

[0124] Through the above implementation methods, the micro-nano structure is more conducive to the hydrophobicity of the superhydrophobic slow-release surface layer. At the same time, the mesoporous carrier not only acts as a slow-release carrier, but can also be used to construct the micro-nano structure of the superhydrophobic slow-release surface layer, which significantly improves the hydrophobic performance of the surface layer.

[0125] In some embodiments of the present invention, the mass fraction of the mesoporous carrier in the superhydrophobic slow-release surface layer is 1%-50%, and optionally 3%-20%.

[0126] In some embodiments of the present invention, the pore size of the mesoporous carrier includes 2-10 nm.

[0127] In some embodiments of the present invention, the mesoporous carrier comprises a hollow mesoporous material.

[0128] In some embodiments of the present invention, the mesoporous carrier comprises a hollow mesoporous material modified by modifier I. In some embodiments of the present invention, the hollow mesoporous material is, but is not limited to, the hollow mesoporous material described in any of the first aspects of the present invention.

[0129] In some embodiments of the present invention, the modifier I includes at least one of a hydrophobic modifier, tetraethyl silicate, or methyltriethoxysilane. Specifically, after hydrolysis, tetraethyl silicate dehydrates and condenses with hydroxyl groups (silanol groups) on the surface of a hollow mesoporous material (such as silica) to form a semi-encapsulation, increasing the bonding strength between particles.

[0130] Through the above embodiments, the mesoporous carrier is hydrophobic and, as a material for constructing the micro-nano structure of the superhydrophobic slow-release surface layer, further improves the hydrophobic performance of the surface layer.

[0131] In some embodiments of the present invention, the hydrophobic modifier includes, but is not limited to, the hydrophobic modifier described in any of the first aspects of the present invention. When the hydrophobic modifier includes fluorosilane, the fluorosilane is a hydrophobic modifier, and its hydrolyzed silanol groups dehydrate and condense with the hydroxyl groups (silanol groups) on the surface of a hollow mesoporous material (such as silica) to form a strong chemical graft.

[0132] In some embodiments of the present invention, the superhydrophobic sustained-release surface layer further includes modified nanoparticles. The modified nanoparticles, together with the mesoporous carrier, can construct a rough micro / nano hydrophobic structure for the superhydrophobic sustained-release surface layer.

[0133] In some embodiments of the present invention, the modified nanoparticles in the superhydrophobic slow-release surface layer have a mass fraction of 1%-50%, such as 5%-20%.

[0134] In some embodiments of the present invention, the modified nanoparticles are obtained by modifying nanoparticles with the modifier I. In some embodiments of the present invention, the nanoparticles include, but are not limited to, the nanoparticles described in any one of the first aspects of the present invention.

[0135] In some embodiments of the present invention, the slurry used to prepare the superhydrophobic slow-release surface layer includes, but is not limited to, the superhydrophobic slow-release surface layer slurry described in any one of the first or second aspects of the present invention.

[0136] In some embodiments of the present invention, the raw materials for preparing the superhydrophobic slow-release surface layer include hollow mesoporous materials, scale inhibitor I, modifier I, catalyst I, nanoparticles, and raw materials of the matrix material I.

[0137] In some embodiments of the present invention, catalyst I comprises sodium methylsilicate. Sodium methylsilicate can enhance the water resistance of the superhydrophobic slow-release surface layer, serve as a catalyst for the hydrolysis and dehydration condensation of fluorosilanes (such as heptadecafluorodecyltrimethoxysilane) and tetraethyl silicate, and does not have the odor of ammonia.

[0138] In some embodiments of the present invention, the matrix material I comprises a cross-linked resin.

[0139] The raw materials for matrix material I can be various, including but not limited to acrylic resin and amino resin. Any resin raw material that, after curing, meets the requirements of having certain strength, water resistance, and not producing adverse reactions with other materials such as scale inhibitor I can be used. For example, it can be a resin raw material with active hydroxyl, amino, methoxy, etc., which can crosslink with the silanol groups in other materials, and has good adhesion to metals and good water resistance.

[0140] In some embodiments of the present invention, the raw materials of the matrix material I include, but are not limited to, the raw materials of the matrix material I described in any one of the first aspects of the present invention.

[0141] In some embodiments of the present invention, the slurry used to prepare the superhydrophobic slow-release surface layer includes, but is not limited to, the superhydrophobic slow-release surface layer slurry described in any one of the first or second aspects of the present invention.

[0142] In some embodiments of the present invention, the scale-inhibiting coating further includes a scale-inhibiting and slow-release inner layer, which comprises a scale inhibitor II and a matrix material II. Optionally, the solubility of the scale inhibitor II in water is less than that of the scale inhibitor I in water. Optionally, the raw materials of the matrix material II include, but are not limited to, the raw materials of the matrix material II described in any one of the first aspects of the present invention. Optionally, the particle size of the scale inhibitor II is 200-3000 mesh, such as 800-3000 mesh.

[0143] In some embodiments of the present invention, the scale inhibitor II includes, but is not limited to, the scale inhibitor II described in any one of the first aspects of the present invention. Scale inhibitor II is a scale inhibitor with low solubility in water. In addition to its chemical scale inhibition function, it can also form a micro / nano structure together with the superhydrophobic slow-release surface layer, enhancing the hydrophobicity of the superhydrophobic slow-release surface layer and thus improving the scale inhibition effect of the scale inhibitor coating.

[0144] In some embodiments of the present invention, the scale-inhibiting coating comprises, from the inside out, the scale-inhibiting and slow-release inner layer and the superhydrophobic and slow-release outer layer stacked together.

[0145] In some embodiments of the present invention, the scale inhibitor II in the scale-inhibiting and slow-release inner layer has a mass fraction of 1%-50%, such as 5%-20%.

[0146] In some embodiments of the present invention, the scale-inhibiting and slow-release inner layer further includes scale inhibitor I. Optionally, the scale inhibitor I in the scale-inhibiting and slow-release inner layer has a mass fraction of 0.01%-1%. Optionally, the scale inhibitor I includes, but is not limited to, the scale inhibitor I described in any one of the first aspects of the present invention.

[0147] In the scale-inhibiting slow-release inner layer, scale inhibitor I will be released preferentially due to its greater solubility. This will provide micropores for the release of poorly soluble scale inhibitor II (such as organophosphate scale inhibitors), preventing scale inhibitor II from being released too slowly. This is beneficial to improving the scale inhibition effect of the scale-inhibiting coating in the later stages of use.

[0148] In some embodiments of the present invention, the scale-inhibiting and slow-release inner layer further includes micron-sized particles. These micron-sized particles not only enhance the mechanical strength of the scale-inhibiting and slow-release inner layer, but also, together with the scale inhibitor II and the superhydrophobic slow-release surface layer in the inner layer, construct a micro / nano structure.

[0149] In some embodiments of the present invention, the mass fraction of micron-sized particles in the scale-inhibiting and slow-release inner layer is 1%-50%, and optionally 5%-20%.

[0150] In some embodiments of the present invention, the micron particles include, but are not limited to, the micron particles described in any of the first aspects of the present invention.

[0151] In some embodiments of the present invention, the scale-inhibiting and slow-release inner layer further includes a leveling agent. Optionally, the leveling agent includes, but is not limited to, the leveling agent described in any of the first aspects of the present invention. The leveling agent can promote leveling, resulting in a better film appearance.

[0152] In some embodiments of the present invention, the thickness of the scale-inhibiting and slow-release inner layer is 5-300 μm.

[0153] In some embodiments of the present invention, the thickness of the scale-inhibiting and slow-release inner layer is 20-150 μm.

[0154] In some embodiments of the present invention, the slurry used to prepare the scale-inhibiting and slow-release inner layer includes, but is not limited to, the scale-inhibiting and slow-release inner layer slurry described in any one of the first or second aspects of the present invention.

[0155] In some embodiments of the present invention, the scale-inhibiting coating further includes a substrate, and the scale-inhibiting slow-release inner layer is located between the substrate and the superhydrophobic slow-release surface layer.

[0156] In some embodiments of the present invention, the substrate includes a metal substrate. For example, the substrate may be stainless steel, etc.

[0157] In some embodiments of the present invention, the scale-inhibiting coating comprises a substrate, a scale-inhibiting slow-release inner layer, and a superhydrophobic slow-release top layer stacked sequentially.

[0158] In some embodiments of the present invention, the substrate can be the area to be scale-inhibited. Optionally, the thickness of the substrate is not limited, such as 0.5-2 mm, or more specifically, 0.5 mm, 1 mm, 1.5 mm, etc.

[0159] In some embodiments of the present invention, the scale-inhibiting coating is prepared using the scale-inhibiting slurry described in any one of the first or second aspects of the present invention. Specifically, the superhydrophobic slow-release surface layer slurry is used to form the superhydrophobic slow-release surface layer, and the scale-inhibiting slow-release inner layer slurry is used to form the scale-inhibiting slow-release inner layer.

[0160] In a fifth aspect, the present invention provides a method for preparing a scale-inhibiting coating, comprising preparing a superhydrophobic slow-release surface layer, specifically including the following steps:

[0161] Scale inhibitor I was loaded onto a hollow mesoporous material and mixed with the raw materials of matrix material I to obtain a superhydrophobic slow-release surface slurry.

[0162] The surface slurry is applied to the surface of the object to be coated to obtain the superhydrophobic slow-release surface layer.

[0163] In some embodiments of the present invention, the material to be coated includes a substrate layer or a scale-inhibiting and slow-release inner layer.

[0164] In some embodiments of the present invention, the scale-inhibiting coating is selected from the scale-inhibiting coatings described in any of the fourth aspects of the present invention.

[0165] In some embodiments of the present invention, the method for preparing the scale-inhibiting coating includes the following steps:

[0166] S1, prepare superhydrophobic slow-release surface layer slurry; prepare scale-inhibiting slow-release inner layer slurry;

[0167] S2, the inner layer slurry is applied to the surface of the substrate and pre-cured, and then the top layer slurry is applied to the surface of the pre-cured inner layer slurry and cured to obtain a scale-inhibiting coating.

[0168] Optionally, the method steps for preparing the surface layer slurry include, but are not limited to, the method steps for preparing the superhydrophobic slow-release surface layer slurry as described in any of the second aspects of the present invention. Optionally, the method steps for preparing the inner layer slurry include, but are not limited to, the method steps for preparing the scale-inhibiting slow-release inner layer slurry as described in any of the second aspects of the present invention.

[0169] In some embodiments of the present invention, in step S2, the pre-curing temperature is 80-180°C, and / or the pre-curing time is 2-60 min. Optionally, in step S2, the pre-curing temperature is 100-140°C, and / or the pre-curing time is 5-20 min.

[0170] In some embodiments of the present invention, in step S2, the curing temperature is 120-250°C, and / or the curing time is 10-120 min. Optionally, in step S2, the curing temperature is 150-200°C, and / or the curing time is 20-50 min.

[0171] In some embodiments of the present invention, in step S2, the inner layer slurry is applied to the surface of the substrate by one or more of the following methods: spraying, scraping, and dipping; and / or, the surface layer slurry is applied to the surface of the inner layer slurry after pre-curing by one or more of the following methods: spraying, scraping, and dipping.

[0172] In a sixth aspect, the present invention provides a valve core comprising the aforementioned scale-inhibiting coating.

[0173] In a seventh aspect, the present invention provides a bathroom appliance comprising the above-described scale-inhibiting coating or the above-described valve core.

[0174] In some embodiments of the present invention, the bathroom fixture includes at least one of a water valve or a water pipe. Attached Figure Description

[0175] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0176] Figure 1 This is a schematic diagram of the scale-inhibiting coating in Embodiment 1 of the present invention;

[0177] Figure 2 This is a graph showing the test results of the contact angle of the scale-inhibiting coating in Embodiment 1 of the present invention. Detailed Implementation

[0178] The following will describe the concept and technical effects of the present invention clearly and completely with reference to embodiments, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention.

[0179] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0180] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0181] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0182] Unless otherwise specified, the temperature in the specific implementation method is room temperature, i.e., within the range of 20-30℃, and will not have a significant impact on the test results.

[0183] In some embodiments of the present invention, the method for preparing the scale inhibitor slurry may include the following steps:

[0184] 1) Preparation of superhydrophobic slow-release surface coating slurry, including:

[0185] ① Take 2-6g of hollow mesoporous silica nanospheres, add 100mL of 0.1-0.2mol / L EDTA disodium salt (ethylenediaminetetraacetic acid disodium salt) aqueous solution, ultrasonically disperse for 10min, then use a stirrer with a dispersion plate to stir at high speed for 0.5h. The container diameter is 8-12cm, the dispersion plate diameter is 6cm, the stirring speed is 1000rpm, and the time is 0.5h. Reduce the stirring speed to 300rpm and continue stirring for 4-24h, ensuring the temperature is 22-30℃ during the period, to obtain the EDTA-loaded nanosphere dispersion.

[0186] ② Centrifuge the above-mentioned EDTA-loaded nanosphere dispersion (e.g., 5000 rpm, 5 min) to obtain precipitate I and supernatant X. Remove supernatant X, and after standardization, replenish the concentration of supernatant X to be the same as that of the aqueous solution of EDTA disodium salt described in step ①. Return it to step ① for mixing with hollow mesoporous silica nanospheres for impregnation and loading.

[0187] ③ Add 30-50g of water to wash precipitate I, centrifuge under the above conditions (e.g., 5000rpm, 5min), remove supernatant A, add 30-50g of water to wash the residue, centrifuge under the above conditions (e.g., 5000rpm, 5min), remove supernatant B, add 30-50g of ethanol, stir and centrifuge, remove supernatant C, and keep the residue for later use.

[0188] ④ Take 10g of fumed silica, add 190g of ethanol, and use a mixer with a dispersion plate to stir and disperse at high speed. The container diameter is 8-12cm, the dispersion plate diameter is 6cm, the stirring speed is 2000rpm, and the time is 1h to obtain a fumed silica dispersion.

[0189] ⑤ Add 60-200g of ethanol to the residue obtained in ③, stir magnetically for 0.5h, then add 5-80g of fumed silica dispersion, 2-10g of heptadecafluorodecyltrimethoxysilane, and 0.4-4g of tetraethyl orthosilicate (TEOS) from ④. Finally, add 1-20g of 30% sodium methylsilicate aqueous solution dropwise, and continue stirring magnetically for 1-4h to obtain a suspension.

[0190] ⑥ Centrifuge the suspension obtained in step ⑤ (e.g., 3500 rpm, 5 min), remove the supernatant, add 10-120 g of ethanol, 1-25 g of acrylic resin, and 0.5-10 g of amino resin, stir for 10 min, and set aside.

[0191] 2) Preparation of scale-inhibiting and slow-release inner layer slurry, including:

[0192] ① Take 0.1-60g of silica micropowder and 0.1-60g of organophosphonate scale inhibitor, add 20g of supernatant A, 20g of supernatant B, 20g of supernatant C, 25g of ethanol, and 5g of isopropanol from step 1). Disperse the mixture at high speed using a mixer with a dispersion disc (container diameter 8-12cm, dispersion disc diameter 6cm), at a stirring speed of 2000rpm for 1 hour. (Silica micropowder + organophosphonate scale inhibitor = 60g, total mixed solvent 90g)

[0193] ② Reduce the stirring speed to 300 rpm, add 1-100g of ethanol, 30-1000g of acrylic resin, 6-250g of amino resin, 0.5-4g of coupling agent KH550, and 0-0.5g of leveling agent, and stir for 10 minutes.

[0194] In some embodiments of the present invention, the method for preparing the scale-inhibiting coating may include the following steps:

[0195] After grinding and cleaning, the 304 stainless steel substrate (10×10cm) 2 The inner layer slurry (with a thickness of 0.9 mm) is applied by scraping and pre-curing at 120°C for 10 min. After cooling, the top layer slurry is applied by scraping and curing at 170°C for 30 min. The thickness of the scale-inhibiting and slow-release inner layer formed by the inner layer slurry is 20-150 μm, and the thickness of the superhydrophobic and slow-release top layer formed by the top layer slurry is 2-20 μm.

[0196] In some embodiments of the present invention, the loading amount of disodium EDTA on the mesoporous support (hollow mesoporous silica nanospheres modified with heptadecafluorodecyltrimethoxysilane and tetraethyl silicate) can be 0.05-0.8 g / g.

[0197] In some embodiments of the present invention, the mass fraction of the mesoporous support (hollow mesoporous silica nanospheres modified with heptadecafluorodecyltrimethoxysilane and tetraethyl silicate) in the superhydrophobic sustained-release surface layer can be 3%-20%. Optionally, the mass fraction of fumed silica modified with heptadecafluorodecyltrimethoxysilane and tetraethyl silicate in the superhydrophobic sustained-release surface layer can be 5%-20%.

[0198] In some embodiments of the present invention, the mass fraction of the organophosphonate scale inhibitor in the scale-inhibiting and slow-release inner layer can be 5%-20%, and / or the mass fraction of the disodium EDTA salt in the scale-inhibiting and slow-release inner layer can be 0.01%-1%.

[0199] In some embodiments of the present invention, the mass fraction of silica micropowder (micron particles) in the scale-inhibiting and slow-release inner layer can be 5%-20%.

[0200] More specifically, the present invention provides the following specific embodiments:

[0201] Unless otherwise specified, the experimental methods described in the following examples are generally performed under conventional conditions in the art or as recommended by the manufacturer; the raw materials and reagents used are all commercially available from the conventional market unless otherwise specified.

[0202] Substrate: 304 stainless steel, 10×10cm 2 The thickness can be 0.9mm;

[0203] Hollow mesoporous silica nanospheres: XFF29, Jiangsu Xianfeng Nanomaterials Technology Co., Ltd., native particle size 100nm; optionally, the hollow mesoporous silica nanospheres can be hollow mesoporous silica nanospheres with pore sizes including 2-10nm;

[0204] Fumed silica (hydrophilic): Cabot M-5, native particle size 12nm;

[0205] Acrylic resin: HOMAAC-5209, Zhuhai Jintuan Chemical Co., Ltd.;

[0206] Amino resin: Cyano 303LF;

[0207] Silica micro powder: Henan Jinrun New Materials Co., Ltd., 3000 mesh;

[0208] Organophosphonate scale inhibitor: SP-F3FFL100, Hangzhou Shangshan New Materials Co., Ltd., pulverized to 1000 mesh for later use;

[0209] Leveling agent: BYK-333.

[0210] Example 1

[0211] This embodiment discloses a scale inhibitor slurry, including a superhydrophobic slow-release surface layer slurry and a scale inhibitor slow-release inner layer slurry, the preparation process of which includes:

[0212] (I) Preparation of superhydrophobic slow-release surface coating slurry, including:

[0213] ① Take 3g of hollow mesoporous silica nanospheres and add 100mL of a 0.15mol / L aqueous solution of disodium EDTA (ethylenediaminetetraacetic acid disodium salt) (the aqueous solution can be obtained by mixing water and disodium EDTA). Disperse ultrasonically for 10min, then disperse using a mixer with a dispersion plate at high speed (container diameter 10cm, dispersion plate diameter 6cm), at 1000rpm for 0.5h. Reduce the stirring speed to 300rpm and continue stirring for 6h to obtain a nanosphere dispersion loaded with disodium EDTA. During ultrasonic dispersion, high-speed stirring, and stirring after reducing the stirring speed to 300rpm, the temperature is maintained at 22-30℃.

[0214] ② Centrifuge the above-mentioned EDTA disodium salt-loaded nanosphere dispersion (5000 rpm, 5 min), remove the supernatant X (approximately 70 g of supernatant X is removed), and obtain residue I. After standardization, the concentration of supernatant X is replenished to 0.15 mol / L, and it can be returned to step ① for impregnation and loading with hollow mesoporous silica nanospheres. Specifically, by standardizing the concentration of EDTA disodium salt in supernatant X to 0.127 mol / L, it is calculated that 3 g of hollow mesoporous silica nanospheres are loaded with 0.773 g of EDTA disodium salt.

[0215] ③ Add 40g of pure water to wash the residue I, centrifuge (5000rpm, 5min), remove supernatant A, then add 40g of pure water to wash the resulting residue II, centrifuge (5000rpm, 5min), remove supernatant B, add 40g of ethanol, stir, centrifuge, remove supernatant C, and keep the resulting residue III for later use. Collect supernatant A, supernatant B, and supernatant C separately for later use. Optionally, the centrifugation speed in each centrifugation step in this procedure can be selected from 3000-12000rpm, or filtration can be used instead of centrifugation to achieve solid-liquid separation.

[0216] ④ Take 10g of fumed silica, add 190g of ethanol, and use a mixer with a dispersion plate to disperse it at high speed. The container diameter is 10cm, the dispersion plate diameter is 6cm, the stirring speed is 2000rpm, and the time is 1h to obtain a fumed silica dispersion.

[0217] ⑤ Add 146g of ethanol to the remaining Ⅲ in ③, stir magnetically for 0.5h, then add 20g of fumed silica dispersion, 6g of heptadecafluorodecyltrimethoxysilane, and 1.2g of tetraethyl silicate (TEOS) from ④. Finally, add 4g of 30% sodium methylsilicate aqueous solution and continue stirring magnetically for 2h to obtain a suspension.

[0218] ⑥ Centrifuge the suspension obtained in step ⑤ (5000 rpm, 5 min), remove the supernatant, add 65 g of ethanol, 8.8 g of acrylic resin and 2.1 g of amino resin, stir for 10 min to obtain the surface slurry, and set aside.

[0219] (II) Preparation of scale-inhibiting and slow-release inner layer slurry, including:

[0220] ① Take 24g of silica micro powder, 36g of organophosphonate scale inhibitor (1000 mesh), add 20g of supernatant A, 20g of supernatant B, 20g of supernatant C, 25g of ethanol and 5g of isopropanol from step (Ⅰ), and disperse them by high-speed stirring with a mixer equipped with a dispersion disc (dispersion disc diameter 6cm, stirring speed 2000rpm, time 1h).

[0221] ② Reduce the stirring speed to 300 rpm, add 25 g of ethanol, 149.6 g of acrylic resin, 33.2 g of amino resin, 1.8 g of coupling agent KH550, and 0.3 g of leveling agent. Stir for 10 min to obtain the inner layer slurry, which is then set aside. According to the standardization of the supernatant AC, the inner layer slurry contains 0.54 g of disodium EDTA.

[0222] Optionally, the surface slurry comprises, by mass percentage, 2.0% hollow mesoporous silica nanospheres, 0.67% nanoparticles, 5.9% acrylic resin, and 1.5% amino resin, wherein the loading of disodium EDTA on the hollow mesoporous silica nanospheres is approximately 0.258 g / g.

[0223] Optionally, the inner slurry comprises, by mass percentage, 6.7% silica micropowder, 10.0% organophosphonate scale inhibitor, 41.5% acrylic resin, 9.2% amino resin, 0.08% leveling agent, and 0.15% disodium EDTA.

[0224] This embodiment discloses a scale-inhibiting coating, comprising a substrate, a scale-inhibiting and slow-release inner layer, and a superhydrophobic slow-release top layer stacked together. The scale-inhibiting and slow-release inner layer has a thickness of 30 μm. After coating with the superhydrophobic slow-release top layer (approximately 5 μm thick), the total thickness of the scale-inhibiting and slow-release inner layer and the superhydrophobic slow-release top layer is approximately 35 μm. The preparation process includes:

[0225] After grinding and cleaning, the 304 stainless steel substrate (10×10cm) 2 The inner layer slurry prepared in this embodiment is applied to a surface with a thickness of 0.9 mm, pre-cured at 120°C for 10 min, cooled, and then the top layer slurry prepared in this embodiment is applied and cured at 170°C for 30 min to obtain a scale-inhibiting coating. The inner layer slurry forms a scale-inhibiting and slow-release inner layer, and the top layer slurry forms a superhydrophobic and slow-release top layer.

[0226] This embodiment discloses a valve core, including the scale-inhibiting coating prepared in this embodiment.

[0227] This embodiment discloses a bathroom device, including the scale-inhibiting coating prepared in this embodiment or the valve core in this embodiment.

[0228] In some other embodiments of the present invention, a coupling agent may be added in step (I)⑥. Optionally, the coupling agent may be KH550 or KH560, etc.

[0229] Example 2

[0230] This embodiment discloses a scale inhibitor slurry, which differs from Example 1 in that, in step (II) ① of the preparation of the scale inhibitor slurry in this embodiment: 42g of silica micro powder is used instead of 24g of silica micro powder in Example 1; 18g of organophosphonate scale inhibitor (SP-F3FFL100) is used instead of 36g of organophosphonate scale inhibitor in Example 1; the other conditions are the same as in Example 1.

[0231] This embodiment discloses a scale-inhibiting coating, which is prepared using the scale-inhibiting slurry obtained in this embodiment, and the preparation method is the same as in Embodiment 1.

[0232] This embodiment discloses a valve core, including the scale-inhibiting coating prepared in this embodiment.

[0233] This embodiment discloses a bathroom device, including the scale-inhibiting coating prepared in this embodiment or the valve core in this embodiment.

[0234] Example 3

[0235] This embodiment discloses a scale inhibitor slurry, which differs from Example 1 in that, in the preparation step (I) of the scale inhibitor slurry in this embodiment: ① 1g of hollow mesoporous silica nanospheres are used instead of 3g of hollow mesoporous silica nanospheres in Example 1; ④ 30g of fumed silica is used instead of 10g of fumed silica in Example 1; the other conditions are the same as in Example 1.

[0236] This embodiment discloses a scale-inhibiting coating, which is prepared using the scale-inhibiting slurry obtained in this embodiment, and the preparation method is the same as in Embodiment 1.

[0237] This embodiment discloses a valve core, including the scale-inhibiting coating prepared in this embodiment.

[0238] This embodiment discloses a bathroom device, including the scale-inhibiting coating prepared in this embodiment or the valve core in this embodiment.

[0239] Example 4

[0240] This embodiment discloses a scale inhibitor slurry, which differs from Example 1 in that, in step (I) ⑤ of the preparation of the scale inhibitor slurry in this embodiment: 1g of heptadecafluorodecyltrimethoxysilane is used instead of 6g of heptadecafluorodecyltrimethoxysilane in Example 1; the other conditions are the same as in Example 1.

[0241] This embodiment discloses a scale-inhibiting coating, which is prepared using the scale-inhibiting slurry obtained in this embodiment, and the preparation method is the same as in Embodiment 1.

[0242] This embodiment discloses a valve core, including the scale-inhibiting coating prepared in this embodiment.

[0243] This embodiment discloses a bathroom device, including the scale-inhibiting coating prepared in this embodiment or the valve core in this embodiment.

[0244] Comparative Example 1

[0245] This comparative example discloses a scale inhibitor slurry, which differs from Example 1 in that the surface layer of the scale inhibitor slurry in this comparative example uses the same mass of fumed silica instead of the hollow mesoporous silica nanospheres loaded with EDTA disodium salt in the surface layer slurry of Example 1; and the inner layer does not contain organophosphonate scale inhibitors.

[0246] The specific steps for preparing this comparative scale inhibitor slurry include:

[0247] (I) Preparation of the surface layer slurry, including:

[0248] ① Take 4g of fumed silica, add 196g of ethanol, and use a mixer with a dispersion plate to disperse it at high speed. The container diameter is 10cm, the dispersion plate diameter is 6cm, the stirring speed is 2000rpm, and the time is 1h to obtain a fumed silica dispersion.

[0249] ② Add 6g of heptadecafluorodecyltrimethoxysilane and 1.2g of tetraethyl silicate (TEOS) to the fumed silica dispersion in ①, and finally add 4g of a 30% sodium methylsilicate aqueous solution. Continue magnetic stirring for 2 hours to obtain a suspension.

[0250] ③ Centrifuge the suspension obtained in step ② (5000 rpm, 5 min), remove the supernatant, add 65 g of ethanol, 8.8 g of acrylic resin and 2.1 g of amino resin, stir for 10 min to obtain the surface slurry, and set aside.

[0251] (II) Preparation of the inner layer slurry, including:

[0252] ① Take 36g and 24g of 1000-mesh and 3000-mesh silica powder respectively, add 40g of pure water, 45g of ethanol and 5g of isopropanol, and disperse them at high speed using a mixer with a dispersion disc (dispersion disc diameter 6cm, stirring speed 2000rpm, time 1h).

[0253] ② Reduce the stirring speed to 300 rpm, add 25 g of ethanol, 149.6 g of acrylic resin, 33.2 g of amino resin, 1.8 g of coupling agent KH550, and 0.3 g of leveling agent. Stir for 10 min to obtain the inner layer slurry for later use.

[0254] This comparative example discloses a scale-inhibiting coating, the preparation method of which includes:

[0255] After grinding and cleaning, the 304 stainless steel substrate (10×10cm) 2 The inner layer slurry prepared in this comparative example (with a thickness of 0.9 mm) was scraped onto the surface and pre-cured at 120℃ for 10 min. After cooling, the top layer slurry prepared in this comparative example was scraped onto the surface and cured at 170℃ for 30 min to obtain the scale inhibitor coating.

[0256] Comparative Example 2

[0257] This comparative example discloses a scale-inhibiting coating, which is a commercially available organic-inorganic hybrid non-stick coating, YS-8803, purchased from Yousheng New Material Technology (Guangzhou) Co., Ltd.

[0258] Test case

[0259] This experimental example tested the performance of the scale-inhibiting coatings obtained in the examples and comparative examples, specifically including:

[0260] 1) Contact angle and roll-off angle tests: Tested according to GB / T 37830-2019; wherein, the test sample size is the sample size prepared in each embodiment and comparative example, the test liquid for contact angle test is 2μL, and the test liquid size for roll-off angle test is detailed in the parentheses of the "Roll-off Angle" item in Table 1.

[0261] 2) Water flow impact resistance test: After being impacted by a water flow with a speed of 6m / s for 10 minutes, the contact angle is >150° and the roll-off angle is <10° to be considered qualified.

[0262] 3) Wet and dry cycle test: Place the sample in the lifting device. When it descends, the sample will gradually be submerged in water. After the sample is completely submerged, it will stay for 1 second, and then rise. After leaving the water surface, it will stay for 4 minutes. This is one cycle. After 6000 cycles, the coating surface is qualified if there is no scale.

[0263] 4) Scale Content Test: Prepare hard water with a hardness of 350 mg / L (1L tap water + 0.251g calcium chloride dihydrate + 0.211g magnesium sulfate heptahydrate + 0.27g sodium bicarbonate + 0.08g sodium chloride). Immerse the sample in 1L of hard water at 50℃ for 50 days (changing the hard water every 2 days; the non-coated side of the sample is covered with water-resistant tape, which is removed after the experiment). After removal, rinse off the attached liquid with a slow stream of water, dry, and weigh. Scale content calculation: sample weight gain / sample single-sided area (100cm²). 2 ).

[0264] The measurement results are shown in Table 1 below:

[0265] Table 1

[0266]

[0267] As shown in Table 1, the scale-inhibiting coating of this invention exhibits good scale-inhibiting performance and long-lasting scale-inhibiting effect, meeting the scale-inhibiting requirements of household underwater components. Comparative Example 1 contains no scale inhibitor in either the surface or inner layer, constituting a double-layer ordinary superhydrophobic coating. The scale content test results in each example are significantly better than those in Comparative Example 1. Compared to Example 4, Example 1 uses a larger amount of hydrophobic modifier, resulting in a better scale-inhibiting coating.

[0268] In summary, the scale-inhibiting coating prepared by the scale-inhibiting slurry of this invention incorporates both physical and chemical scale-inhibiting technologies. The superhydrophobic slow-release surface layer exhibits superhydrophobicity, making it extremely difficult for scale to deposit on the surface. The introduction of a slow-release scale inhibitor I into the superhydrophobic slow-release surface layer results in a long-lasting scale-inhibiting effect. Specifically, the highly soluble scale inhibitor I (such as disodium EDTA) in the superhydrophobic slow-release surface layer utilizes a mesoporous material as a slow-release carrier. The scale inhibitor II in the inner slow-release layer is heavily coated with resin and initially blocked by a well-preserved topcoat, making its release difficult in the early stages. However, it begins to release later, after the superhydrophobic slow-release surface layer has undergone some damage. Furthermore, the relatively low solubility of scale inhibitor II and its slow release rate further enhance the durability of the scale-inhibiting effect of the coating.

[0269] The scale-inhibiting coating of this invention features a double-layer superhydrophobic coating structure (superhydrophobic slow-release top layer + scale-inhibiting slow-release inner layer), ensuring the mechanical properties of the scale-inhibiting coating. Both coatings can slow-release the scale inhibitor, achieving a combination of physical and chemical scale inhibition, resulting in a long-lasting scale-inhibiting effect. Furthermore, the hydrophobic coating can use resins from the same system, thus ensuring strong adhesion between the coatings. Adding an appropriate amount of resin to the topcoat does not significantly affect the superhydrophobic performance.

[0270] During the preparation of the surface layer, some of the waste liquid from centrifugation can be utilized, which is environmentally friendly. The scale inhibitors introduced into the waste liquid can also participate in the slow release. Specifically, some of the supernatant from centrifugation can be used directly, greatly reducing the amount of waste liquid to be treated. Among them, the supernatants A, B, and C transferred to the scale inhibitor slow-release inner layer slurry contain trace amounts of scale inhibitor I (such as disodium EDTA). On the one hand, no additional addition is needed to the inner layer slurry. On the other hand, scale inhibitor I will be preferentially released in the later stage due to its higher solubility. At this time, it will provide micropores for the release of the poorly soluble scale inhibitor II (such as organophosphate scale inhibitor), so that scale inhibitor II is not released too slowly. The mesoporous carrier (such as modified hollow mesoporous silica nanospheres) in the superhydrophobic slow-release surface layer slurry acts as both a slow-release carrier and a building material for the micro-nano structure required for the superhydrophobic coating. In addition to scale inhibition, the large-particle-size organophosphate scale inhibitor in the scale inhibitor slow-release inner layer can also construct microstructures together with silica micropowder. The various materials play a synergistic role.

[0271] In addition, ethanol (such as water without ethanol) and isopropanol can be used as solvents. Isopropanol can also appropriately adjust the film-forming properties of the coating, and fluorosilanes have a certain solubility in ethanol and isopropanol, which can improve the hydrophobic treatment effect.

[0272] Unless otherwise specified, the term "about" in this invention actually means that the allowable error is within ±5%, for example, about 100 actually means 100 ± 2% × 100. Unless otherwise specified, "room temperature" or "room temperature" in this invention is approximately 20-30°C.

[0273] Unless otherwise specified, "between" in this invention includes the number itself, for example, "between 2 and 3" includes the endpoint values ​​2 and 3.

[0274] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

Claims

1. A scale inhibitor slurry, characterized in that, The slurry comprises a superhydrophobic slow-release topcoat slurry and a scale-inhibiting slow-release innercoat slurry. The topcoat slurry comprises a raw material of matrix material I, a hollow mesoporous material, and a scale inhibitor I loaded on the hollow mesoporous material. The hollow mesoporous material is hollow mesoporous nanoparticles with a particle size of 10-500 nm. The scale inhibitor I comprises at least one of an organic acid having a tertiary amine or a salt of the organic acid. The inner layer slurry includes the raw material of matrix material II, scale inhibitor II, and micron particles. The scale inhibitor II includes at least one of organophosphonate scale inhibitor, polymer scale inhibitor containing amide groups, or polymer scale inhibitor containing sulfonic acid groups.

2. The scale inhibitor slurry according to claim 1, characterized in that, The raw materials for preparing the surface layer slurry include the raw materials of matrix material I, hollow mesoporous material, modifier I, and scale inhibitor I; and / or, the raw materials for preparing the surface layer slurry further include nanoparticles; and / or, the raw materials for preparing the surface layer slurry further include catalyst I; and / or, the modifier I includes at least one of hydrophobic modifier, tetraethyl silicate, or methyltriethoxysilane; and / or, the nanoparticles include at least one of silica, alumina, zinc oxide, titanium dioxide, or silicon carbide; and / or, the particle size of the nanoparticles is 1-200 nm; and / or, the catalyst I includes sodium methylsilicate.

3. The scale inhibitor slurry according to claim 2, characterized in that, The organic acid includes at least one of ethylenediaminetetraacetic acid, ethylenetriaminetetraacetic acid, diethylenetriaminepentaacetic acid, ethylenediaminetetramethylphosphonic acid, aminotrimethylenephosphonic acid, or diethylenetriaminepentamethylidene phosphate; and / or, the salt of the organic acid includes at least one of the sodium salt or potassium salt of the organic acid; and / or, the hollow mesoporous nanoparticles include at least one of hollow mesoporous silica nanospheres, hollow mesoporous alumina, hollow mesoporous zinc oxide, hollow mesoporous titanium dioxide, or hollow mesoporous silicon carbide; and / or, the scale inhibitor I is loaded onto the hollow mesoporous material at a rate of 0.05-0.8 g per gram of hollow mesoporous material; and / or, the hydrophobic modifier includes fluorosilane; and / or, the raw materials of the matrix material I include acrylic resin I and amino resin I.

4. The scale inhibitor slurry according to claim 3, characterized in that, In the raw materials for preparing the surface slurry, the mass ratio of the hollow mesoporous material, nanoparticles, fluorosilane, tetraethyl silicate, catalyst I, acrylic resin I and amino resin I is (2-6):(0.25-4):(2-10):(0.4-4):(0.1-20):(1-25):(0.5-10).

5. The scale inhibitor slurry according to claim 1, characterized in that, The scale inhibitor II has a particle size of 200-3000 mesh; and / or, the inner layer slurry further includes a leveling agent; and / or, the inner layer slurry further includes scale inhibitor I.

6. The scale inhibitor slurry according to claim 5, characterized in that, The micron-sized particles include at least one of silicon dioxide, aluminum oxide, zinc oxide, titanium dioxide, or silicon carbide; and / or, the particle size of the micron-sized particles is 200-3000 mesh; and / or, the leveling agent includes at least one of BYK-333, TEGO-410, or DC-57; and / or, the raw materials of the matrix material II include acrylic resin II, amino resin II, and coupling agent II.

7. A method for preparing the scale inhibitor slurry according to claim 1, characterized in that, The preparation of a superhydrophobic slow-release surface slurry includes: loading scale inhibitor I onto a hollow mesoporous material and mixing it with the raw materials of matrix material I to obtain the surface slurry.

8. The method for preparing the scale inhibitor slurry according to claim 7, characterized in that, Scale inhibitor I is loaded onto a hollow mesoporous material and mixed with solvent I-1, a dispersion of nanoparticles, modifier I, and catalyst I. After centrifugation to remove the supernatant, mixture I is obtained. Then, it is mixed with the raw material of matrix material I and solvent I-2 to obtain the surface slurry.

9. The method for preparing the scale inhibitor slurry according to claim 8, characterized in that, The specific steps for preparing the surface slurry include: Sa-1, take a mixture of scale inhibitor I, hollow mesoporous material and dispersing solvent A, disperse and adsorb to obtain a dispersion of hollow mesoporous material loaded with scale inhibitor I, separate and wash to obtain the washing liquid and hollow mesoporous material loaded with scale inhibitor I. The nanoparticles were mixed with dispersion solvent B and dispersed to obtain a dispersion of nanoparticles. Sa-2 is prepared by mixing the hollow mesoporous material of the scale inhibitor I, solvent I-1, dispersion of nanoparticles, modifier I, and catalyst I, centrifuging to remove the supernatant to obtain mixture I, and then mixing it with the raw material of matrix material I and solvent I-2 to obtain the surface slurry.

10. The method for preparing the scale inhibitor slurry according to claim 9, characterized in that, The preparation method further includes preparing a scale inhibitory slow-release inner layer slurry. The specific steps for preparing the inner layer slurry include: mixing the scale inhibitor II, the raw materials of the matrix material II, and the solvent II to obtain the inner layer slurry.

11. The method for preparing the scale inhibitor slurry according to claim 10, characterized in that, Solvent II includes solvent II-1 and solvent II-2, and the steps for preparing the inner layer slurry specifically include: Sb-1, take scale inhibitor II, micron particles and solvent II-1, mix them to obtain mixture II; Sb-2, the mixture II is mixed with solvent II-2, the raw material of matrix material II, and leveling agent to obtain the inner layer slurry.

12. The method for preparing the scale inhibitor slurry according to claim 10, characterized in that, Solvent II comprises the washing solution obtained in step Sa-1.

13. The method for preparing the scale inhibitor slurry according to claim 12, characterized in that, The washing solution contains scale inhibitor I.

14. A method of using a scale-inhibiting slurry according to any one of claims 1-6 or a scale-inhibiting slurry prepared by the preparation method according to any one of claims 7-13, characterized in that, The process includes the following steps: applying a scale-inhibiting and slow-release inner layer slurry to the surface of the object to be coated, pre-curing it, and then applying a superhydrophobic and slow-release top layer slurry to the pre-cured surface of the inner layer slurry, followed by curing.

15. A scale-inhibiting coating, characterized in that, The scale-inhibiting coating is prepared from the scale-inhibiting slurry according to claim 1. The scale-inhibiting coating includes a superhydrophobic slow-release surface layer and a scale-inhibiting slow-release inner layer. The superhydrophobic slow-release surface layer includes a matrix material I, a mesoporous carrier, and a scale inhibitor I loaded on the mesoporous carrier.

16. The scale-inhibiting coating according to claim 15, characterized in that, The thickness of the superhydrophobic slow-release surface layer is 0.5-100 μm; and / or, the contact angle between the superhydrophobic slow-release surface layer and water is greater than 150°; and / or, the loading amount of scale inhibitor I on the mesoporous carrier is 0.05-0.8 g of scale inhibitor I per gram of mesoporous carrier; and / or, the superhydrophobic slow-release surface layer has a micro / nano structure; and / or, the mesoporous carrier comprises a hollow mesoporous material modified by modifier I; and / or, the superhydrophobic slow-release surface layer further comprises modified nanoparticles.

17. The scale-inhibiting coating according to claim 16, characterized in that, The modifier I includes at least one of a hydrophobic modifier, tetraethyl silicate, or methyltriethoxysilane; and / or, the modified nanoparticles are obtained by modifying nanoparticles with modifier I.

18. The scale-inhibiting coating according to claim 17, characterized in that, The organic acid includes at least one of ethylenediaminetetraacetic acid, ethylenetriaminetetraacetic acid, diethylenetriaminepentaacetic acid, ethylenediaminetetramethylphosphonic acid, aminotrimethylenephosphonic acid, or diethylenetriaminepentamethylphosphonic acid; and / or, the salt of the organic acid includes at least one of the sodium salt or potassium salt of the organic acid; and / or, the particle size of the nanoparticles is 1-200 nm; and / or, the nanoparticles include at least one of silicon dioxide, alumina, zinc oxide, titanium dioxide, or silicon carbide; and / or, the hollow mesoporous nanoparticles include at least one of hollow mesoporous silica nanospheres, hollow mesoporous alumina, hollow mesoporous zinc oxide, hollow mesoporous titanium dioxide, or hollow mesoporous silicon carbide.

19. The scale-inhibiting coating according to claim 15, characterized in that, The scale inhibitor II has a particle size of 200-3000 mesh; and / or, the scale inhibitor slow-release inner layer further includes micron particles; and / or, the scale inhibitor slow-release inner layer has a thickness of 5-300 μm; and / or, the scale inhibitor slow-release inner layer further includes scale inhibitor I.

20. The scale-inhibiting coating according to claim 19, characterized in that, The micron particles include at least one of silicon dioxide, aluminum oxide, zinc oxide, titanium dioxide, or silicon carbide; and / or, the particle size of the micron particles is 200-3000 mesh.

21. A method for preparing the scale-inhibiting coating according to claim 15, characterized in that, The preparation of the superhydrophobic slow-release surface layer includes the following steps: Scale inhibitor I was loaded onto a hollow mesoporous material and mixed with the raw materials of matrix material I to obtain a superhydrophobic slow-release surface slurry. The surface slurry is applied to the surface of the object to be coated to obtain the superhydrophobic slow-release surface layer.

22. The method for preparing the scale-inhibiting coating according to claim 21, characterized in that, Includes the following steps: S1, prepare superhydrophobic slow-release surface layer slurry; prepare scale-inhibiting slow-release inner layer slurry; S2, the inner layer slurry is applied to the surface of the substrate and pre-cured, and then the top layer slurry is applied to the surface of the pre-cured inner layer slurry and cured to obtain a scale-inhibiting coating.

23. The method for preparing the scale-inhibiting coating according to claim 22, characterized in that, In step S2, the pre-curing temperature is 80-180℃, and / or the pre-curing time is 2-60 min.

24. The method for preparing the scale-inhibiting coating according to claim 22, characterized in that, In step S2, the curing temperature is 120-250℃, and / or the curing time is 10-120 min.

25. A valve core, characterized in that, This includes the scale-inhibiting coating according to any one of claims 15-20 or the scale-inhibiting coating prepared by the preparation method according to any one of claims 21-24.

26. A bathroom fixture, characterized in that, This includes the scale-inhibiting coating according to any one of claims 15-20, the scale-inhibiting coating prepared by the preparation method according to any one of claims 21-24, or the valve core according to claim 25.

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