Microcapsule, preparation method thereof, coating and insulator
By using calcium carbonate or magnesium carbonate carrier to load metal molybdate or tungstate microcapsules in the coating, the problem that traditional coatings cannot prevent moisture penetration is solved, and effective protection and long-term stability improvement of electric tower insulators are achieved. .
Patent Information
- Application Number
- CN202411445997.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-01-10
AI Technical Summary
Traditional coatings cannot effectively prevent moisture penetration, resulting in corrosion of metal materials and cannot protect the tower insulators for a long time.
Microcapsules with the carrier of calcium carbonate or magnesium carbonate, and metal molybdate or metal tungstate are used as passivating agents. Microcapsules are prepared through specific molar ratios and reaction steps to form a slow-release passivating agent for preparation. Paint containing microcapsules to block moisture penetration.
It effectively extends the service life of the insulator, improves the long-term stability and anti-corrosion effect of the paint, and reduces maintenance costs.
Smart Images
Figure CN119286300A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of coatings, and in particular to a microcapsule and a preparation method thereof, a coating and an insulator. Background Art
[0002] Tower insulators are key components in power transmission infrastructure. They are prone to rapid degradation and failure when exposed to harsh environmental conditions for a long time. Therefore, paint is generally used to coat the metal surface of the insulator, wrapping the metal surface in a layer of coating with extremely high hardness and toughness, so that the metal surface will not be exposed to oxygen and moisture in the air, thereby achieving an anti-rust effect. At the same time, it also has the characteristics of environmental protection, convenient construction, and good safety.
[0003] However, traditional coatings provide limited protection for metal materials and are often unable to prevent moisture penetration under long-term exposure, causing corrosion of metal materials. Summary of the invention
[0004] Based on this, it is necessary to provide a microcapsule and a preparation method thereof, a coating and an insulator that can effectively block moisture penetration and improve corrosion effect.
[0005] The present application provides a microcapsule, comprising a carrier and a passivating agent loaded on the carrier;
[0006] Wherein, the passivating agent includes one or two of metal molybdate and metal tungstate;
[0007] The carrier includes one or both of calcium carbonate and magnesium carbonate.
[0008] In one embodiment, the mass percentage of the passivating agent in the microcapsule is 5% to 15%.
[0009] In one embodiment, the particle size of the microcapsule is 1500nm~5000nm.
[0010] The present application also provides a method for preparing the microcapsules as described above, comprising the following steps:
[0011] Mixing a first salt, a surfactant, and an organic solvent to prepare a mixed solution;
[0012] Adding a second salt and a passivating agent to the mixed solution, reacting the first salt and the second salt to prepare a carrier, the passivating agent precipitates and is loaded on the carrier, stirring, filtering out solids, and preparing microcapsules;
[0013] Wherein, the passivating agent includes one or two of metal molybdate and metal tungstate;
[0014] The carrier includes one or both of calcium carbonate and magnesium carbonate.
[0015] In one embodiment, the ratio of the first salt, the surfactant and the organic solvent in the mixed solution is (0.004~0.008) mol: (0.001~0.005) mol: (100~300) ml.
[0016] In one embodiment, the molar ratio of the first salt, the second salt and the passivating agent is (60-70): (3-5): (1-4).
[0017] In one embodiment, after filtering out the solid, the method further includes drying the solid.
[0018] Furthermore, the present application provides a coating, comprising a resin and the microcapsules as described above.
[0019] In one embodiment, the mass ratio of the microcapsules to the resin is 1: (80~200).
[0020] Furthermore, the present application also provides an insulator, comprising a substrate and a coating covering the substrate, wherein the material of the coating comprises the coating as described above.
[0021] The microcapsules provided in the present application include a carrier and a passivator loaded on the carrier. By matching specific passivators and carrier materials, the microcapsules loaded with the passivator are slowly released as the environment changes, so that the coating containing the above microcapsules can effectively block moisture penetration and improve the long-term stability and anti-corrosion effect of the coating.
[0022] The coating containing microcapsules is applied to the surface of the insulator substrate to effectively extend the service life of the insulator, reduce the frequency of replacement and maintenance, and thus reduce long-term maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0024] Figure 1 is a scanning electron microscope image of the microcapsules prepared in Example 1;
[0025] Figure 2 This is a scanning electron microscope image of the material obtained in Comparative Example 1;
[0026] Figure 3 The impedance diagram is a graph of a carbon steel sample surface coated with the coating of Example 1 and Comparative Example 1 and immersed for 30 minutes. DETAILED DESCRIPTION
[0027] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.
[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.
[0029] The term "and / or" used herein includes any one of two or more related listed items, and also includes any and all combinations of the related listed items, wherein the any and all combinations include any combination of two related listed items, any more related listed items, or all related listed items. For example, "A and / or B" includes three parallel solutions: A, B, and "a combination of A and B".
[0030] In this article, unless otherwise specified, "one or more" means any one of the listed items or any combination of the listed items. Similarly, "one or more" and other expressions that mean "one or more" are also understood in the same way unless otherwise specified.
[0031] In this document, "further", "further", "particularly", "for example", "such as", "example", "for example", etc. are used for descriptive purposes, indicating that the previous and subsequent technical solutions are related in terms of the content covered, but should not be understood as limiting the previous technical solution, nor can they be understood as limiting the scope of protection of this document. In this document, unless otherwise specified, A (such as B) means that B is a non-limiting example of A, and it can be understood that A is not limited to B.
[0032] Herein, "optionally", "optional", and "optional" mean optional, that is, any one of the two parallel schemes of "yes" or "no". If multiple "optional" items appear in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction, each "optional" item is independent of each other. In this application, descriptions such as "optionally contain", "optionally include", etc. mean "contain or not contain". "Optional component X" means that component X exists or does not exist, or means that component X is contained or not contained.
[0033] In this document, the terms "first", "second", "third", "fourth", etc. in "the first aspect", "the second aspect", "the third aspect", "the fourth aspect", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.
[0034] In this article, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.
[0035] Herein, when it comes to a numerical interval (i.e., a numerical range), unless otherwise specified, the distribution of the optional numerical values within the numerical interval is considered to be continuous and includes the two numerical endpoints (i.e., the minimum and maximum values) of the numerical interval, and each numerical value between the two numerical endpoints. Unless otherwise specified, when a numerical interval only refers to integers within the numerical interval, including the two endpoint integers of the numerical range, and each integer between the two endpoints, is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical ranges disclosed herein should be understood to include any and all sub-ranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. "Numerical interval" allows broadly including numerical interval types such as percentage intervals, ratio intervals, and ratio intervals.
[0036] Herein, the term "room temperature" or "normal temperature" generally refers to 4°C~35°C, for example, 20°C±5°C. In some embodiments herein, "room temperature" or "normal temperature" refers to 10°C~30°C. In some embodiments herein, "room temperature" or "normal temperature" refers to 20°C~30°C.
[0037] In this article, if there are multiple steps involved in the method flow, unless there is a clear different description in this article, there is no strict order restriction for the execution of these steps, and they can be executed in other orders than described. Moreover, any step can include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn, alternating or simultaneously with other steps or parts of sub-steps or stages of other steps.
[0038] The present application provides a microcapsule, comprising a carrier and a passivating agent loaded on the carrier;
[0039] Wherein, the passivating agent includes one or two of metal molybdate and metal tungstate;
[0040] The carrier includes one or both of calcium carbonate and magnesium carbonate.
[0041] The microcapsules provided in the present application include a carrier and a passivator loaded on the carrier. By matching specific passivators and carrier materials, the microcapsules loaded with the passivator are slowly released as the environment changes, so that the coating containing the above microcapsules can effectively block moisture penetration and improve the long-term stability and anti-corrosion effect of the coating.
[0042] Further, the passivating agent is one or both of sodium tungstate and sodium molybdate, and the carrier is calcium carbonate. Preferably, the passivating agent is sodium tungstate.
[0043] It can be understood that the microcapsules composed of nano-scale carriers and nano-scale passivators improve the mechanical and physical properties of the coating, such as enhancing hardness, wear resistance and adhesion, making the structure of the coating stronger, effectively extending the service life of the tower insulators, and resisting corrosion and wear under harsh environmental conditions.
[0044] In a specific example, the passivating agent accounts for 5% to 15% by mass of the microcapsule.
[0045] Specifically, the mass percentage of the passivating agent in the microcapsule may be, but is not limited to, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14% or 15%.
[0046] In a specific example, the particle size of the microcapsule is 1500nm-5000nm. Specifically, the particle size of the microcapsule can be, but is not limited to, 1500nm, 2000nm, 2500nm, 3000nm, 3500nm, 4000nm, 4500nm or 5000nm.
[0047] The present application also provides a method for preparing the microcapsules as described above, comprising the following steps:
[0048] Mixing a first salt, a surfactant, and an organic solvent to prepare a mixed solution;
[0049] Adding the second salt and the passivator to the mixed solution, the first salt and the second salt react to prepare a carrier, the passivator precipitates and is loaded on the carrier, stirring, filtering out the solid, and preparing microcapsules;
[0050] Wherein, the passivating agent includes one or two of metal molybdate and metal tungstate;
[0051] The carrier includes one or both of calcium carbonate and magnesium carbonate.
[0052] In a specific example, the stirring time is 200 min to 300 min. Specifically, the stirring time can be but is not limited to 200 min, 205 min, 210 min, 220 min, 225 min, 230 min, 235 min, 240 min, 245 min, 250 min, 255 min, 260 min, 265 min, 270 min, 275 min, 280 min, 285 min, 290 min, 295 min or 300 min.
[0053] In a specific example, the ratio of the first salt, the surfactant, and the organic solvent in the mixed solution is (0.004~0.008) mol: (0.001~0.005) mol: (100~300) ml.
[0054] Furthermore, the ratio of the first salt, the surfactant and the organic solvent in the mixed solution is (0.1~2)g: (0.2~3)g: (100~300)ml.
[0055] Furthermore, the surfactant is an anionic surfactant, and the anionic surfactant may be, but is not limited to, sodium cetyl sulfate.
[0056] In a specific example, the organic solvent may be, but is not limited to, one or both of ethanol and methanol.
[0057] In a specific example, the molar ratio of the first salt, the second salt and the passivator is (60-70): (3-5): (1-4). Further, the molar ratio of the first salt, the second salt and the passivator is (62-68): (3-5): (1-4).
[0058] In a specific example, the mass ratio of the second salt to the passivator is (1~5): (1~5), and the mass ratio of the second salt to the passivator is (4~5): (2~5).
[0059] It can be understood that the first salt is a soluble metal carbonate, the second salt includes one or both of a soluble calcium salt and a soluble magnesium salt, the first salt and the second salt react in a solution to prepare a carrier (one or both of calcium carbonate and magnesium carbonate), as the reaction proceeds, the carrier is continuously generated, and in the process of forming the above-mentioned carrier, a nucleation site is also provided for the passivator, so that the passivator is precipitated and loaded on the carrier. For example, the first salt is sodium carbonate, and the second salt is calcium chloride. With the addition of calcium chloride, calcium chloride and sodium carbonate are subjected to a double decomposition reaction to prepare a solid calcium carbonate with low solubility as a carrier, and as the reaction continues, the carrier is continuously generated, so that the passivator is precipitated and loaded on the carrier.
[0060] In a specific example, after stirring and before filtering, the step of washing the solid with deionized water is also included. After the solid is separated by filtering, the step of drying the solid is also included.
[0061] Further, the drying temperature is 50°C to 80°C, and the drying time is 30h to 40h. Specifically, the drying temperature may be, but not limited to, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C or 80°C, and the drying time may be, but not limited to, 30h, 32h, 34h, 36h, 38h or 40h.
[0062] Furthermore, the present application provides a coating, comprising a resin and the microcapsules as described above.
[0063] In a specific example, the mass ratio of microcapsules to resin is 1: (80~200).
[0064] Specifically, the mass ratio of microcapsules to resin can be, but is not limited to, 1:80, 1:85, 1:90, 1:95, 1:100, 1:105, 1:110, 1:115, 1:120, 1:125, 1:130, 1:135, 1:140, 1:145, 1:150, 1:155, 1:160, 1:165, 1:170, 1:175, 1:180, 1:185, 1:190, 1:195 or 1:200.
[0065] Furthermore, the resin is an epoxy resin, specifically but not limited to, one or both of E51 epoxy resin and E54 epoxy resin.
[0066] Furthermore, the coating also includes a curing agent, and further, the curing agent is a polyetheramine curing agent.
[0067] Furthermore, the molar ratio of the resin to the curing agent in the coating is (2-8):3. Specifically, the molar ratio of the resin to the curing agent can be, but is not limited to, 2:3, 3:3, 4:3, 5:3, 6:3, 7:3 or 8:3.
[0068] The coatings made from the above-mentioned coatings can maintain stable performance in a variety of environments, including extreme temperature, humidity and chemical environments, and are suitable for various complex and changing field conditions. They have broad application prospects in the power industry, especially showing great potential in improving the safety and reliability of power equipment.
[0069] Furthermore, the present application also provides an insulator, including a substrate and a coating covering the substrate, wherein the material of the coating includes the coating as described above.
[0070] It can be understood that the material of the substrate can be but is not limited to a single metal or an alloy. Further, the substrate is carbon steel.
[0071] The coating containing microcapsules is applied to the surface of the insulator substrate to effectively extend the service life of the insulator, reduce the frequency of replacement and maintenance, and thus reduce long-term maintenance costs.
[0072] The present application is further described in detail below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are preferably referred to the guidance given in the present application, and can also be based on the experimental manuals or conventional conditions in the art, can also be based on the conditions recommended by the manufacturer, or refer to experimental methods known in the art.
[0073] In the following specific embodiments, the measured parameters of raw material components may have slight deviations within the range of weighing accuracy unless otherwise specified. For temperature and time parameters, acceptable deviations caused by instrument test accuracy or operation accuracy are allowed. "Normal temperature" refers to 25°C; "normal pressure" refers to 100KPa or 101KPa.
[0074] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0075] The E51 epoxy resin and E54 epoxy resin used in the following examples and comparative examples were purchased from Shanghai Maclean Biochemical Technology Co., Ltd., and the polyetheramine curing agent was purchased from Shanghai Maclean Biochemical Technology Co., Ltd. with a brand number of D-230.
[0076] Example 1
[0077] This embodiment provides a microcapsule and a coating containing the microcapsule. 0.7 g of sodium carbonate (Na2CO3) and 1.2 g of sodium hexadecyl sulfate are completely dissolved in 200 mL of ethanol. Then, a CaCl2 aqueous solution (100 mL, 0.42 g / L) and a Na2MoO4 aqueous solution (100 mL, 0.42 g / L) are injected into the above solution. After stirring at room temperature for 240 min, the particles are washed with deionized water and collected by filtration, and then dried at 60°C for 36 h. Microcapsules are obtained. Figure 1 The figure shows a scanning electron microscope image of the above microcapsule. In this embodiment, the passivating agent Na2MoO4 accounts for 13% of the total mass of the microcapsule.
[0078] The microcapsules were mixed in E51 epoxy resin under magnetic stirring, and the added mass of microcapsules was 1% of E51 epoxy resin. Then, a mechanical stirrer was used to rotate at 600 rpm for 10 minutes, and a polyetheramine curing agent was added to the above mixture (the molar ratio of epoxy resin to polyetheramine curing agent was 5:3) to prepare the coating.
[0079] Example 2
[0080] The difference from Example 1 is that the added amount of 0.22 g / L Na2MoO4 is 100 ml, and the passivating agent Na2MoO4 in the prepared microcapsules accounts for 8% of the total mass of the microcapsules.
[0081] This embodiment provides a microcapsule and a coating containing the microcapsule.
[0082] 0.7 g of sodium carbonate (Na2CO3) and 1.2 g of sodium hexadecyl sulfate were completely dissolved in 200 mL of ethanol. Then, a CaCl2 aqueous solution (100 mL, 0.42 g / L) and a Na2MoO4 aqueous solution (100 mL, 0.22 g / L) were injected into the above solution. After stirring at room temperature for 240 min, the particles were washed with deionized water and collected by filtration, and then dried at 60°C for 36 h. Microcapsules were obtained. In this embodiment, the passivating agent Na2MoO4 accounted for 8% of the total mass of the microcapsules.
[0083] The microcapsules were mixed in E51 epoxy resin under magnetic stirring, and the added mass of microcapsules was 1% of E51 epoxy resin. Then, a mechanical stirrer was used to rotate at 600 rpm for 10 minutes, and a polyetheramine curing agent was added to the above mixture (the molar ratio of epoxy resin to polyetheramine curing agent was 5:3) to prepare the coating.
[0084] Example 3
[0085] The difference from Example 1 is that the passivating agent Na2MoO4 is replaced by Na2WO4, and the passivating agent Na2WO4 in the prepared microcapsules accounts for 10% of the total mass of the microcapsules.
[0086] This embodiment provides a microcapsule and a coating containing the microcapsule.
[0087] 0.7 g of sodium carbonate (Na2CO3) and 1.2 g of sodium hexadecyl sulfate were completely dissolved in 200 mL of ethanol. Then, a CaCl2 aqueous solution (100 mL, 0.42 g / L) and a Na2WO4 aqueous solution (100 mL, 0.42 g / L) were injected into the above solution. After stirring at room temperature for 240 min, the particles were washed with deionized water and collected by filtration, and then dried at 60°C for 36 h. Microcapsules were obtained. In this embodiment, the passivating agent Na2WO4 accounted for 10% of the total mass of the microcapsules.
[0088] The microcapsules were mixed in E51 epoxy resin under magnetic stirring, and the added mass of microcapsules was 1% of E51 epoxy resin. Then, a mechanical stirrer was used to rotate at 600 rpm for 10 minutes, and a polyetheramine curing agent was added to the above mixture (the molar ratio of epoxy resin to polyetheramine curing agent was 5:3) to prepare the coating.
[0089] Example 4
[0090] The difference from Example 1 is that the carrier CaCO3 is replaced by MgCO3.
[0091] This embodiment provides a microcapsule and a coating containing the microcapsule.
[0092] 0.7 g of NaCO3 and 1.2 g of sodium hexadecyl sulfate were completely dissolved in 200 mL of ethanol. Then, MgCl2 aqueous solution (100 mL, 4.2 g / L) and Na2MoO4 aqueous solution (100 mL, 4.2 g / mL) were injected into the above solution. After stirring at room temperature for 240 min, the particles were washed with deionized water and collected by filtration, and then dried at 60°C for 36 h. Microcapsules were obtained, and the passivating agent Na2MoO4 accounted for 9% of the total mass of the microcapsules.
[0093] The microcapsules were mixed in E51 epoxy resin under magnetic stirring, and the added mass of microcapsules was 1% of E51 epoxy resin. Then, a mechanical stirrer was used to rotate at 600 rpm for 10 minutes, and a polyetheramine curing agent was added to the above mixture (the molar ratio of epoxy resin to polyetheramine curing agent was 5:3) to prepare the coating.
[0094] Example 5
[0095] The difference from Example 1 is that the E51 epoxy resin is replaced by the E54 epoxy resin.
[0096] This embodiment provides a microcapsule and a coating containing the microcapsule.
[0097] 0.7 g of sodium carbonate (Na2CO3) and 1.2 g of sodium hexadecyl sulfate were completely dissolved in 200 mL of ethanol. Then, a CaCl2 aqueous solution (100 mL, 0.42 g / L) and a Na2MoO4 aqueous solution (100 mL, 0.42 g / L) were injected into the above solution. After stirring at room temperature for 240 min, the particles were washed with deionized water and collected by filtration, and then dried at 60°C for 36 h. Microcapsules were obtained. In this embodiment, the passivator Na2MoO4 accounted for 13% of the total mass of the microcapsules.
[0098] The microcapsules were mixed in E51 epoxy resin under magnetic stirring, and the added mass of microcapsules was 1% of E54 epoxy resin. Then, a mechanical stirrer was used to rotate at 600 rpm for 10 minutes, and a polyetheramine curing agent was added to the above mixture (the molar ratio of epoxy resin to polyetheramine curing agent was 5:3) to prepare the coating.
[0099] Example 6
[0100] The difference from Example 1 is that the amount of surfactant added is changed from 1.2 g to 1.0 g, and the passivating agent Na2MoO4 in the prepared microcapsules accounts for 12% of the total mass of the microcapsules.
[0101] This embodiment provides a microcapsule and a coating containing the microcapsule.
[0102] 0.7 g of sodium carbonate (Na2CO3) and 1.0 g of sodium hexadecyl sulfate were completely dissolved in 200 mL of ethanol. Then, a CaCl2 aqueous solution (100 mL, 0.42 g / L) and a Na2MoO4 aqueous solution (100 mL, 0.42 g / L) were injected into the above solution. After stirring at room temperature for 240 min, the particles were washed with deionized water and collected by filtration, and then dried at 60°C for 36 h. Microcapsules were obtained. In this embodiment, the passivating agent Na2MoO4 accounted for 12% of the total mass of the microcapsules.
[0103] The microcapsules were mixed in E51 epoxy resin under magnetic stirring, and the added mass of microcapsules was 1% of E51 epoxy resin. Then, a mechanical stirrer was used to rotate at 600 rpm for 10 minutes, and a polyetheramine curing agent was added to the above mixture (the molar ratio of epoxy resin to polyetheramine curing agent was 5:3) to prepare the coating.
[0104] Comparative Example 1
[0105] The difference from Example 1 is that the passivating agent Na2MoO4 is not added. Figure 2 Shown is a scanning electron microscope image of the material obtained in this comparative example.
[0106] Comparative Example 2
[0107] The difference from Example 1 is that no surfactant is added and no microcapsule structure is formed.
[0108] Test methods and result representation
[0109] The Q235 carbon steel sample was wet-polished with 150 and 240 sandpapers respectively, and the coating containing microcapsules in the above embodiments and comparative examples was coated on the surface of the carbon steel sample with a thickness of 80 μm and placed in a 3.5 wt % sodium chloride solution.
[0110] After waiting for 30 minutes, electrochemical impedance spectroscopy was performed on the carbon steel samples in each solution. The impedance values were measured using an impedance spectrum with a frequency range of 0.01 to 10,000 Hz. The EIS data were analyzed and fitted to determine the impedance values and corresponding electrochemical parameters. Figure 3 The impedance diagram is a graph of a carbon steel sample surface coated with the coating of Example 1 and Comparative Example 1 and immersed for 30 minutes.
[0111] The surface of the carbon steel sample was coated with 80 μm thick layers of the above embodiments and comparative examples and placed in a 3.5wt% sodium chloride solution for chemical resistance stability test. The chemical resistance stability criterion is: placed in the above solution of 3.5wt% sodium chloride solution for 18 months, and observed and counted every month whether bubbling or shedding occurred, which is summarized in Table 1.
[0112] Table 1
[0113]
[0114] It can be seen that the microcapsules composed of the carrier calcium carbonate and the passivating agent sodium molybdate added to the coating have the best anti-corrosion effect, and the carbon steel samples have good chemical resistance stability. Even if the microcapsules composed of other carriers and other passivating agents have good chemical resistance stability, they are better than the unloaded material of Comparative Example 1. It can be seen that the coating containing the microcapsules of the present application applied to the surface of the insulator substrate can effectively extend the service life of the insulator, reduce the frequency of replacement and maintenance, and thus reduce the long-term maintenance cost.
[0115] The above-described embodiments only express several implementation methods of the present invention, which are convenient for understanding the technical solutions of the present invention in detail, but they cannot be understood as limiting the scope of protection of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided by the present invention are all within the protection scope of the claims attached to the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the contents of the attached claims, and the description and drawings can be used to explain the contents of the claims.
Claims
1. A microcapsule, characterized in that: It includes a carrier and a passivating agent loaded on the carrier; Wherein, the passivating agent includes one or two of metal molybdate and metal tungstate; The carrier includes one or both of calcium carbonate and magnesium carbonate.
2. The microcapsule according to claim 1, characterized in that The mass percentage of the passivator in the microcapsule is 5% to 15%.
3. The microcapsule according to claim 1 or 2, characterized in that The particle size of the microcapsule is 1500nm~5000nm.
4. A method for preparing a microcapsule according to any one of claims 1 to 3, characterized in that: The following steps are involved: Mixing a first salt, a surfactant, and an organic solvent to prepare a mixed solution; Adding a second salt and a passivating agent to the mixed solution, reacting the first salt and the second salt to prepare a carrier, the passivating agent precipitates and is loaded on the carrier, stirring, filtering out solids, and preparing microcapsules; Wherein, the passivating agent includes one or two of metal molybdate and metal tungstate; The carrier includes one or both of calcium carbonate and magnesium carbonate.
5. The preparation method according to claim 4, characterized in that: The ratio of the first salt, the surfactant and the organic solvent in the mixed solution is (0.004~0.008) mol: (0.001~0.005) mol: (100~300) ml.
6. The preparation method according to claim 4, characterized in that: The molar ratio of the first salt, the second salt and the passivating agent is (60~70): (3~5): (1~4).
7. The preparation method according to any one of claims 4 to 6, characterized in that: After filtering out the solid, the method further comprises the step of drying the solid.
8. A coating, characterized in that: The method comprises a resin and the microcapsule according to any one of claims 1 to 3.
9. The coating according to claim 8, characterized in that The mass ratio of the microcapsules to the resin is 1: (80-200).
10. An insulator, characterized in that: It comprises a substrate and a coating covering the substrate, wherein the material of the coating comprises the coating as claimed in claim 8 or 9.