Water-based electromagnetic shielding coating for outdoor mobile base stations, its preparation method and application

Abstract

This invention belongs to the field of coating technology, and specifically relates to a water-based electromagnetic shielding coating for outdoor mobile base stations, its preparation method, and its application. The primer comprises: 5-25 parts of a water-based acrylic emulsion with a solid content of 40-60%, several fillers and additives, and 0-5 parts of deionized water. The topcoat consists of component A and component B, comprising: component A: 40-70 parts of a water-based acrylic dispersion with a solid content of 35-55%, several fillers and additives, and 5-15 parts of deionized water; component B: 100 parts of a water-based HDI curing agent with a solid content of 100%. Compared with existing technologies, this invention solves the problem that existing coatings are difficult to meet the performance requirements in terms of electromagnetic wave shielding, adhesion, fire resistance, heat insulation, weather resistance, water resistance, and salt spray resistance. The water-based electromagnetic shielding coating of this solution, through a composite coating and a two-component system, exhibits excellent performance in terms of flexibility, water resistance, weather resistance, and salt spray resistance.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, and in particular relates to a water-based electromagnetic shielding coating for outdoor mobile base stations, its preparation method, and its application. Background Technology

[0002] With the continuous development of 5G technology, the construction of outdoor base stations is becoming increasingly common. To ensure the long-term stable operation of 5G base stations and prevent malicious damage, the internal circuits and chips of the base stations need to operate in an environment free from electromagnetic interference. This requires the base station casing, especially the non-metallic casing, to be coated with an anti-electromagnetic wave coating to ensure that the internal circuits are not interfered with by electromagnetic waves. The internal circuits of base stations are high-precision equipment and are easily affected by external electromagnetic waves, especially malicious interference. As a public facility, base stations require high stability and security and need to operate in an environment free from electromagnetic interference and at a constant temperature. This requires the base station casing to have strong shielding and reflection of electromagnetic waves, fireproofing, and heat insulation functions to ensure the long-term stable operation of the base station. Currently, the commonly used method is to spray an electromagnetic wave shielding coating on the base station casing to reduce electromagnetic interference to the internal circuits. At the same time, the coating also needs to have fireproof and flame-retardant functions, heat insulation functions, good adhesion to plastics and metals, good water and salt spray resistance, good outdoor weather resistance, and good impact resistance.

[0003] Electromagnetic shielding coatings used for outdoor mobile base stations are mainly wave-absorbing coatings; for example, Chinese patent application number CN201710239885.4 discloses an electromagnetic wave shielding coating and its preparation method, the coating components and weight fractions are as follows: 38-40 parts of water-soluble polyurethane resin, 7-9 parts of carbon-coated nano electromagnetic wave shielding agent, 35-37 parts of metal powder, 3-4 parts of 1,2-bis(trifluoromethanesulfonyloxy)tetramethylsilane, 9-11 parts of terpineol wetting agent, 41-43 parts of water, 3-5 parts of silicon carbide whiskers, and 66-69 parts of ethanol. This solution is a water-based polyurethane electromagnetic wave shielding coating. Experiments have shown that this shielding coating has a good effect on broadband wave absorption due to the addition of chiral wave absorbing agent. However, this solution also has the following problems: (1) The wave absorption effect is generally poor, especially in environments with severe radio wave interference, the electromagnetic wave shielding effect is generally poor; (2) The adhesion on metal and plastic is generally poor and it is easy to fall off; (3) There is no fireproof, heat insulation and heat preservation effect; (4) The outdoor weather resistance, water resistance and salt spray resistance are poor and cannot meet the requirements of outdoor base station applications. Furthermore, CN202411968328.2 discloses a water-based insulating coating for rail transit vehicle roofs, its preparation method, and its application. Through the combination of water-based epoxy emulsions, it possesses good salt spray resistance, weather resistance, voltage resistance, insulation, and electrical breakdown resistance. CN201880000336.4 discloses a water-based electromagnetic shielding coating, its preparation method, and its application. Through the combination of water-based polyurethane adhesive and conductive powder, it improves the electromagnetic shielding effect and coating adhesion. However, these existing technologies cannot meet all the performance requirements of the surface coating layer of outdoor mobile base stations. Summary of the Invention

[0004] The purpose of this invention is to address at least one of the aforementioned problems by providing a water-based electromagnetic shielding coating for outdoor mobile base stations, its preparation method, and its application. This addresses the difficulty in simultaneously meeting the performance requirements of existing water-based electromagnetic shielding coatings in terms of electromagnetic wave shielding, adhesion, fire resistance, heat insulation, weather resistance, water resistance, and salt spray resistance. The water-based electromagnetic shielding coating of this invention, through a composite coating and a two-component system, exhibits excellent performance in terms of flexibility, water resistance, weather resistance, and salt spray resistance.

[0005] The objective of this invention is achieved through the following technical solution: The first aspect of this invention discloses a water-based electromagnetic shielding coating for outdoor mobile base stations, which consists of a primer and a topcoat; The primer comprises the following raw material components in parts by weight: 5-25 parts of water-based acrylic emulsion, 1-4 parts of dispersant, 1-5 parts of silver powder, 65-85 parts of silver-coated copper powder, 0.1-0.5 parts of anti-settling agent, 0.1-0.5 parts of defoamer, 0.1-0.5 parts of wetting and leveling agent, 0.1-0.5 parts of thickener, 1-4 parts of film-forming aid, and 0-5 parts of deionized water; the solid content of the water-based acrylic emulsion is 40-60%. The topcoat is composed of component A and component B, including the following raw material components in parts by weight; Component A: 40-70 parts of aqueous acrylic dispersion, 1-4 parts of dispersant, 5-10 parts of carboxylated iron powder, 5-10 parts of nickel-zinc ferrite, 1-4 parts of conductive carbon black, 5-10 parts of nano-silicon carbide powder, 1-4 parts of hollow glass beads, 1-4 parts of flame retardant, 0.1-0.5 parts of anti-settling agent, 0.1-0.5 parts of defoamer, 0.1-0.5 parts of wetting and leveling agent, 0.1-0.5 parts of thickener, 2-6 parts of film-forming aid, and 5-15 parts of deionized water; the solid content of the aqueous acrylic dispersion is 35-55%. Component B: 100 parts of water-based curing agent; the water-based curing agent is a water-based HDI curing agent with a solid content of 100%.

[0006] Preferably, the water-based electromagnetic shielding coating is composed of the following raw material components in parts by weight: Primer: 10-20 parts of water-based acrylic emulsion, 2-3 parts of dispersant, 2-4 parts of silver powder, 70-80 parts of silver-coated copper powder, 0.2-0.4 parts of anti-settling agent, 0.2-0.4 parts of defoamer, 0.2-0.4 parts of wetting and leveling agent, 0.2-0.4 parts of thickener, 3-5 parts of film-forming aid, and 0-3 parts of deionized water; Topcoat: Component A: 50-60 parts of water-based acrylic dispersion, 2-3 parts of dispersant, 6-8 parts of carboxylated iron powder, 6-8 parts of nickel-zinc ferrite, 2-3 parts of conductive carbon black, 6-8 parts of nano-silicon carbide powder, 2-3 parts of hollow glass beads, 2-3 parts of flame retardant, 0.2-0.4 parts of anti-settling agent, 0.2-0.4 parts of defoamer, 0.2-0.4 parts of wetting and leveling agent, 0.2-0.4 parts of thickener, 2-3 parts of film-forming aid, and 7-13 parts of deionized water; Component B: 100 parts of water-based curing agent; Curing weight ratio: Component A: Component B = 100: 20.

[0007] Preferably, the aqueous acrylic emulsion is aqueous acrylic emulsion PR71K with a solid content of 45-55%; The aqueous acrylic dispersion is Bayhydur A2470, with a solid content of 40-50%. The water-based curing agent is Bayhydur XP 2655, with a solid content of 100%.

[0008] Preferably, the silver powder and silver-coated copper powder have a particle size of 10 micrometers.

[0009] Preferably, the carboxylated iron powder and nickel-zinc ferrite have a particle size of 1-3 micrometers.

[0010] Preferably, the conductive carbon black is VXC72; The hollow glass beads are 2046H with a particle size of 20 micrometers; The flame retardant is LD-109.

[0011] Preferably, the dispersant is Tego760; The anti-settling agent is LAPONITE RDS; The defoamer is Tego815N; The wetting and leveling agent is Tego450; The thickener is RHEOVIS PU1191.

[0012] Preferably, the film-forming aid is a compound of ethylene glycol monobutyl ether and dipropylene glycol butyl ether in a mass ratio of 1:1-2.

[0013] A second aspect of this invention discloses a method for preparing an aqueous electromagnetic shielding coating for outdoor mobile base stations as described above, comprising the following steps: S1: Primer S11: Pour some deionized water into a container; S12: Add dispersant, defoamer, anti-settling agent, silver powder, and silver-coated copper powder to the container in sequence, and stir evenly to obtain primer slurry; S13: Add the primer slurry to the emulsion tank, then add the water-based acrylic emulsion, wetting and leveling agent, film-forming aid and thickener, and add the remaining deionized water. Stir and mix to obtain the primer. S2: Topcoat S21: Pour some deionized water into a container; S22: Add dispersant, defoamer, anti-settling agent, carboxylated iron powder, nickel-zinc ferrite, conductive carbon black, nano silicon carbide powder, and flame retardant in sequence, stir evenly and grind to obtain topcoat slurry; S23: Add the topcoat slurry to the emulsion tank, then add the water-based acrylic dispersion, wetting and leveling agent, film-forming aid, hollow glass beads and thickener, and add the remaining deionized water. Stir and mix to obtain component A of the topcoat. S24: Mix components A and B thoroughly before applying the topcoat.

[0014] Before applying the topcoat, mix component A and component B evenly by weight (component A:component B = 100:20).

[0015] The third aspect of the present invention discloses the application of an aqueous electromagnetic shielding coating for outdoor mobile base stations as described above on the metal or plastic surface of outdoor mobile base stations.

[0016] The water-based electromagnetic shielding coating has at least one of the following properties: Electromagnetic wave resistance: Shielding effect of -50dB or more (50-2000MHz) Cross-cut adhesion test: Adhesion ≤ Grade 1 cross-cut adhesion test; Impact resistance: ≥1kg / 50cm; Flexibility: ≤2mm; Water resistance: No abnormalities were observed after immersion in water at 40℃ for 10 days; High temperature and high humidity resistance: After being placed at 85℃ / 85% humidity for 10 days, the adhesion is ≥2MPa; Thermal insulation performance: thermal conductivity <0.25W / (m·K); Weather resistance: No abnormalities observed after 1000 hours; Salt spray resistance: No abnormalities observed after 1000 hours.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention employs a composite coating consisting of a primer and a topcoat. The primer is a conductive coating with excellent adhesion; it contains silver-coated copper powder, which has low resistance and effectively reflects electromagnetic radiation. The topcoat contains carboxyl iron powder and nickel-zinc ferrite, and through optimized proportions, it achieves excellent broadband and strong wave absorption effects. Simultaneously, the addition of hollow glass beads and flame retardants provides the coating with good thermal insulation and flame retardant properties. Due to its two-component system, the coating exhibits excellent flexibility, water resistance, weather resistance, and salt spray resistance.

[0018] Furthermore, this invention employs a water-based system, offering environmental and safety advantages such as low VOCs and non-flammability / explosiveness, making it suitable for coating outdoor mobile base station surfaces. By optimizing the ratio of film-forming aids and thickeners, the coating exhibits excellent leveling and film-forming properties during application, facilitating industrial-scale production.

[0019] In summary, this invention not only solves the problems of poor wave absorption, mediocre electromagnetic wave shielding, poor adhesion, poor fire resistance, poor heat insulation, poor weather resistance, water resistance, and salt spray resistance in the prior art, but also provides an environmentally friendly, efficient, and easy-to-apply water-based electromagnetic shielding coating solution. Detailed Implementation

[0020] The present invention will now be described in detail with reference to specific embodiments, but these are by no means limitations on the present invention.

[0021] Unless otherwise specified, the reagents used in the following description are conventional commercial products, the methods used are well-known in the art, and any other matters not covered herein can be handled using existing technology.

[0022] Overall, the aqueous electromagnetic shielding coating for outdoor mobile base stations in this invention comprises the following raw material components in parts by weight: Primer: 5-25 parts of water-based acrylic emulsion, 1-4 parts of dispersant, 1-5 parts of silver powder, 65-85 parts of silver-coated copper powder, 0.1-0.5 parts of anti-settling agent, 0.1-0.5 parts of defoamer, 0.1-0.5 parts of wetting and leveling agent, 0.1-0.5 parts of thickener, 1-4 parts of film-forming aid, and 0-5 parts of deionized water; Topcoat: Component A: 40-70 parts of water-based acrylic dispersion, 1-4 parts of dispersant, 5-10 parts of carboxylated iron powder, 5-10 parts of nickel-zinc ferrite, 1-4 parts of conductive carbon black, 5-10 parts of nano-silicon carbide powder, 1-4 parts of hollow glass beads, 1-4 parts of flame retardant, 0.1-0.5 parts of anti-settling agent, 0.1-0.5 parts of defoamer, 0.1-0.5 parts of wetting and leveling agent, 0.1-0.5 parts of thickener, 2-6 parts of film-forming aid, and 5-15 parts of deionized water; Component B: 100 parts of water-based curing agent.

[0023] Component A : Component B = 100 : 20 (by weight).

[0024] In practical implementation, the water-based electromagnetic shielding coating is composed of the following raw material components in parts by weight: Primer: 10-20 parts of water-based acrylic emulsion, 2-3 parts of dispersant, 2-4 parts of silver powder, 70-80 parts of silver-coated copper powder, 0.2-0.4 parts of anti-settling agent, 0.2-0.4 parts of defoamer, 0.2-0.4 parts of wetting and leveling agent, 0.2-0.4 parts of thickener, 3-5 parts of film-forming aid, and 0-3 parts of deionized water; Topcoat: Component A: 50-60 parts of water-based acrylic dispersion, 2-3 parts of dispersant, 6-8 parts of carboxylated iron powder, 6-8 parts of nickel-zinc ferrite, 2-3 parts of conductive carbon black, 6-8 parts of nano-silicon carbide powder, 2-3 parts of hollow glass beads, 2-3 parts of flame retardant, 0.2-0.4 parts of anti-settling agent, 0.2-0.4 parts of defoamer, 0.2-0.4 parts of wetting and leveling agent, 0.2-0.4 parts of thickener, 2-3 parts of film-forming aid, and 7-13 parts of deionized water; Component B: 100 parts of water-based curing agent.

[0025] Component A : Component B = 100 : 20 (by weight).

[0026] In specific implementation, the aqueous acrylic emulsion is aqueous acrylic emulsion PR71K, manufactured by Dow, with a solid content of 45-55%.

[0027] In specific implementation, the aqueous acrylic dispersion is Bayhydur A2470, manufactured by Covestro, with a solid content of 40-50%.

[0028] In specific implementation, the water-based curing agent is Bayhydur XP 2655, manufactured by Covestro, with a solid content of 100%.

[0029] In practice, the silver powder and silver-coated copper powder are 10-micron conductive powders manufactured by Guangzhou Yinfeng.

[0030] In practice, the carboxylated iron powder and nickel-zinc ferrite are 1-3 micron powders, manufactured by Hebei Teren.

[0031] In specific implementation, the conductive carbon black is VXC72, manufactured by Cabot; the nano silicon carbide powder is manufactured by Xi'an Keneng; the hollow glass beads are 2046H, 20 microns in size, manufactured by Shanghai Electric Power International; and the flame retardant is LD-109 water-based coating special flame retardant, manufactured by Dongguan Lianding New Materials.

[0032] In specific implementation, the dispersant is Tego760, the anti-settling agent is BYK's LAPONITE RDS, the defoamer is Tego815N, the wetting and leveling agent is Tego450, and the thickener is BASF's RHEOVIS PU1191.

[0033] In specific implementation, the film-forming aid is a compound of ethylene glycol monobutyl ether and dipropylene glycol butyl ether in a mass ratio of 1:1-2.

[0034] In practice, before applying the topcoat, mix component A and component B evenly according to their weight ratio.

[0035] Performance testing: Electromagnetic wave resistance Test conditions / standards: The test standard is GB / T 25471-2010 Measurement Method for Shielding Effectiveness of Electromagnetic Shielding Coatings.

[0036] Cross-cut adhesion test (adhesion test) Test conditions / standards: The standard adopted is GB / T 9286-1998 Cross-cut test for paint and varnish film.

[0037] Use a cross-cutting tool to draw 1mm x 1mm squares on the coating surface, stick them with tape, and then quickly peel them off. Evaluate the adhesion level based on the area of ​​coating peeling off (level 0 is the best, level 5 is the worst).

[0038] Impact resistance Test conditions / standards: The standard adopted is GB / T 1732-1993 Test Method for Impact Resistance of Coating Film.

[0039] Using an impact tester, drop a 1kg hammer from a height of 50cm to impact the coating surface and observe whether the coating cracks or peels off.

[0040] flexibility Test conditions / standards: The standard adopted is GB / T 1731-1993, Test Method for Flexibility of Coating Film.

[0041] The coated sample is bent on a shaft of a certain diameter, and the coating is observed to see if cracks or peeling occur. The minimum bending diameter (e.g., ≤2mm) is used as the flexibility evaluation index.

[0042] Water resistance Test conditions / standards: The standard adopted is GB / T 1733-1993, Test Method for Water Resistance of Coating Film.

[0043] Immerse the coated sample in deionized water at 40℃ for 10 days and observe whether the coating exhibits any abnormal phenomena such as blistering, peeling, or discoloration.

[0044] Thermal insulation (thermal conductivity coefficient test) Test conditions / standards: The standard GB / T 10295-2008, "Determination of Steady-State Thermal Resistance and Related Properties of Thermal Insulation Materials - Heat Flow Meter Method," was adopted. The thermal conductivity of the coating was determined using the heat flow meter method, requiring a thermal conductivity <0.25 W / (m·K).

[0045] Weather resistance Test conditions / standards: The standard adopted is GB / T 1865-2009 Paints and Varnishes - Artificial Climate Aging and Artificial Radiation Exposure.

[0046] Using a xenon lamp aging test chamber, environmental conditions such as ultraviolet light, temperature, and humidity are simulated to conduct a 1000-hour accelerated aging test to evaluate changes in the appearance and performance of the coating.

[0047] Salt spray Test conditions / standards: The standard adopted is GB / T 10125-2012 Salt spray test for corrosion testing under artificial atmosphere.

[0048] The coated sample was placed in a 5% NaCl solution at 35°C in a salt spray chamber for 1000 hours, and the coating was observed to show signs of corrosion, blistering, or peeling.

[0049] The present invention will now be described in detail with reference to specific embodiments. Any preparation methods, materials, structures, or composition ratios not explicitly described in this technical solution should be considered as common technical features disclosed in the prior art.

[0050] Example 1 The components and weight percentages of the water-based electromagnetic shielding coating used in this embodiment for outdoor mobile base stations are as follows: Primer: Aqueous acrylic emulsion PR71K, 15 parts; Dispersant Tego760, 2 parts; Guangzhou Yinfeng Silver Powder, 3 servings; Guangzhou Yinfeng Silver-Packed Copper Powder, 75 portions; Anti-settling agent LAPONITE RDS, 0.3 parts; Defoamer Tego815N, 0.3 parts; Wetting and leveling agent Tego 450, 0.3 parts; Thickener RHEOVIS PU1191, 0.3 parts; 1 part of ethylene glycol monobutyl ether; Dipropylene glycol butyl ether, 2 parts; Deionized water, 0.8 parts; Topcoat: Component A: Aqueous acrylic dispersion Bayhydur XP 2655, 55 parts Dispersant Tego760, 2 parts Hebei extra-tough carboxylated iron powder, 7 parts; Hebei high-toughness nickel-zinc ferrite, 7 parts; Conductive carbon black VXC72, 2.5 parts; Xi'an Keneng Nano Silicon Carbide Powder, 7 parts; Shanghai Foreign Electric Hollow Glass Beads 2046H, 2.5 parts; Dongguan Lianding flame retardant LD-109, 2.5 parts; Anti-settling agent LAPONITE RDS, 0.3 parts; Defoamer Tego815N, 0.3 parts; Wetting and leveling agent Tego 450, 0.3 parts; Thickener RHEOVIS PU1191, 0.3 parts; 1 part of ethylene glycol monobutyl ether; Dipropylene glycol butyl ether, 1.5 parts; Deionized water, 10.8 parts; Component B: 100 parts of water-based curing agent.

[0051] Component A : Component B = 100 : 20 (by weight).

[0052] The preparation method of the water-based electromagnetic shielding coating for outdoor mobile base stations in this embodiment specifically includes the following steps: Primer: (1) Weigh a portion of the deionized water and add it to the tank; (2) Weigh the dispersant and defoamer and put them into the tank, then stir at low speed for 20 minutes; (3) Weigh the anti-settling agent, silver powder, and silver-coated copper powder and put them into the tank, then stir at low speed for 30 minutes; (4) The fineness of the slurry is mixed to below 15 micrometers using a mixer; (5) Add the slurry to the emulsion tank and stir at low speed for 30 minutes; (6) Add the water-based acrylic emulsion, wetting and leveling agent, film-forming aid, remaining deionized water and thickener into the tank, stir at low speed for 30 minutes, and it is done.

[0053] In steps (1)-(6) above, the low-speed stirring is 200-300 rpm, the medium-speed stirring is 300-500 rpm, and the high-speed stirring is 500-700 rpm.

[0054] Topcoat: (1) Weigh a portion of the deionized water and add it to the tank; (2) Weigh the dispersant and defoamer and put them into the tank, then stir at medium speed for 20 minutes; (3) Weigh the anti-settling agent, carboxylated iron powder, nickel-zinc ferrite, conductive carbon black, nano silicon carbide powder and flame retardant and put them into the cylinder, and stir at medium speed for 30 minutes. (4) Grind the slurry to a fineness of less than 20 micrometers using a grinding mill; (5) Add the slurry to the emulsion tank and stir at medium speed for 30 minutes; (6) Add the water-based acrylic dispersion, wetting and leveling agent, film-forming aid, hollow glass beads, remaining deionized water and thickener into the tank, stir at low speed for 30 minutes, and it is done.

[0055] In steps (1)-(6) above, the low-speed stirring is 200-300 rpm, the medium-speed stirring is 300-500 rpm, and the high-speed stirring is 500-700 rpm.

[0056] It should be noted separately that before applying the topcoat, components A and B should be mixed evenly according to their weight ratio.

[0057] The test results of the coating film performance in this embodiment are shown in Table 1 below.

[0058] Table 1. Test results of coating film performance in Example 1 Comparative Example 1 The components and weight percentages of the water-based electromagnetic shielding coating used in this comparative example for outdoor mobile base stations are as follows: Primer: No primer; Topcoat: Component A: Aqueous acrylic dispersion Bayhydur XP 2655, 55 parts; Dispersant Tego760, 2 parts; Hebei extra-tough carboxylated iron powder, 7 parts; Hebei high-toughness nickel-zinc ferrite, 7 parts; Conductive carbon black VXC72, 2.5 parts; Xi'an Keneng Nano Silicon Carbide Powder, 7 parts; Shanghai Foreign Electric Hollow Glass Beads 2046H, 2.5 parts; Dongguan Lianding flame retardant LD-109, 2.5 parts; Anti-settling agent LAPONITE RDS, 0.3 parts; Defoamer Tego815N, 0.3 parts; Wetting and leveling agent Tego 450, 0.3 parts; Thickener RHEOVIS PU1191, 0.3 parts; 1 part of ethylene glycol monobutyl ether; Dipropylene glycol butyl ether, 1.5 parts; Deionized water, 10.8 parts; Component B: 100 parts of water-based curing agent.

[0059] Component A : Component B = 100 : 20 (by weight).

[0060] The preparation method of the water-based electromagnetic shielding coating for outdoor mobile base stations in this comparative example specifically includes the following steps: Topcoat: (1) Weigh a portion of the deionized water and add it to the tank; (2) Weigh the dispersant and defoamer and put them into the tank, then stir at medium speed for 20 minutes; (3) Weigh the anti-settling agent, carboxylated iron powder, nickel-zinc ferrite, conductive carbon black, nano silicon carbide powder and flame retardant and put them into the cylinder, and stir at medium speed for 30 minutes. (4) Grind the slurry to a fineness of less than 20 micrometers using a grinding mill; (5) Add the slurry to the emulsion tank and stir at medium speed for 30 minutes; (6) Add the water-based acrylic dispersion, wetting and leveling agent, film-forming aid, hollow glass beads, remaining deionized water and thickener into the tank, stir at low speed for 30 minutes, and it is done.

[0061] In steps (1)-(6) above, the low-speed stirring is 200-300 rpm, the medium-speed stirring is 300-500 rpm, and the high-speed stirring is 500-700 rpm.

[0062] It should be noted separately that before applying the topcoat, components A and B should be mixed evenly according to their weight ratio.

[0063] The test results of the paint film performance of this comparative example are shown in Table 2 below.

[0064] Table 2. Test results of paint film performance in Comparative Example 1 Compared to Example 1, adhesion decreased, electromagnetic wave shielding performance decreased, impact resistance decreased, water resistance decreased, high temperature and humidity resistance decreased, and salt spray resistance decreased.

[0065] As can be seen, Comparative Example 1 completely removed the primer, while the rest was the same as in Example 1. Test results showed that the adhesion of the coating to plastic or metal decreased by only 3 levels, while also leading to a decrease in the coating's impact resistance, water resistance, high temperature and humidity resistance, and salt spray resistance (these properties are related to adhesion); the electromagnetic wave shielding effect also decreased significantly. This indicates that the addition of the primer in this solution can significantly improve the coating's electromagnetic wave resistance, as well as its adhesion to the substrate, and significantly improve its impact resistance, water resistance, high temperature and humidity resistance, and salt spray resistance; a single topcoat cannot meet the comprehensive performance requirements of the coating.

[0066] Comparative Example 2 The components and weight percentages of the water-based electromagnetic shielding coating used in this comparative example for outdoor mobile base stations are as follows: Primer: Aqueous acrylic emulsion PR71K, 15 parts; Dispersant Tego760, 2 parts; Guangzhou Yinfeng Silver Powder, 3 servings; Guangzhou Yinfeng Silver-Packed Copper Powder, 75 portions; Anti-settling agent LAPONITE RDS, 0.3 parts; Defoamer Tego815N, 0.3 parts; Wetting and leveling agent Tego 450, 0.3 parts; Thickener RHEOVIS PU1191, 0.3 parts; 1 part of ethylene glycol monobutyl ether; Dipropylene glycol butyl ether, 2 parts; Deionized water, 0.8 parts; Topcoat: Component A: Aqueous acrylic dispersion Bayhydur XP 2655, 55 parts; Dispersant Tego760, 2 parts; Hebei Extra-tough Carboxylated Iron Powder, 0 parts; Hebei high-toughness nickel-zinc ferrite, 14 parts; Conductive carbon black VXC72, 2.5 parts; Xi'an Keneng Nano Silicon Carbide Powder, 7 parts; Shanghai Foreign Electric Hollow Glass Beads 2046H, 2.5 parts; Dongguan Lianding flame retardant LD-109, 2.5 parts; Anti-settling agent LAPONITE RDS, 0.3 parts; Defoamer Tego815N, 0.3 parts; Wetting and leveling agent Tego 450, 0.3 parts; Thickener RHEOVIS PU1191, 0.3 parts; 1 part of ethylene glycol monobutyl ether; Dipropylene glycol butyl ether, 1.5 parts; Deionized water, 10.8 parts; Component B: 100 parts of water-based curing agent.

[0067] Component A : Component B = 100 : 20 (by weight).

[0068] The preparation method of the water-based electromagnetic shielding coating for outdoor mobile base stations in this comparative example specifically includes the following steps: Primer: (1) Weigh a portion of the deionized water and add it to the tank; (2) Weigh the dispersant and defoamer and put them into the tank, then stir at low speed for 20 minutes; (3) Weigh the anti-settling agent, silver powder, and silver-coated copper powder and put them into the tank, then stir at low speed for 30 minutes; (4) The fineness of the slurry is mixed to below 15 micrometers using a mixer; (5) Add the slurry to the emulsion tank and stir at low speed for 30 minutes; (6) Add the water-based acrylic emulsion, wetting and leveling agent, film-forming aid, remaining deionized water and thickener into the tank, stir at low speed for 30 minutes, and it is done.

[0069] In steps (1)-(6) above, the low-speed stirring is 200-300 rpm, the medium-speed stirring is 300-500 rpm, and the high-speed stirring is 500-700 rpm.

[0070] Topcoat: (1) Weigh a portion of the deionized water and add it to the tank; (2) Weigh the dispersant and defoamer and put them into the tank, then stir at medium speed for 20 minutes; (3) Weigh the anti-settling agent, carboxylated iron powder, nickel-zinc ferrite, conductive carbon black, nano silicon carbide powder and flame retardant and put them into the cylinder, and stir at medium speed for 30 minutes. (4) Grind the slurry to a fineness of less than 20 micrometers using a grinding mill; (5) Add the slurry to the emulsion tank and stir at medium speed for 30 minutes; (6) Add the water-based acrylic dispersion, wetting and leveling agent, film-forming aid, hollow glass beads, remaining deionized water and thickener into the tank, stir at low speed for 30 minutes, and it is done.

[0071] In steps (1)-(6) above, the low-speed stirring is 200-300 rpm, the medium-speed stirring is 300-500 rpm, and the high-speed stirring is 500-700 rpm.

[0072] It should be noted separately that before applying the topcoat, components A and B should be mixed evenly according to their weight ratio.

[0073] The test results of the paint film performance of this comparative example are shown in Table 3 below.

[0074] Table 3. Test results of paint film performance in Comparative Example 2 Compared to Example 1, the electromagnetic wave shielding performance is reduced.

[0075] Comparative Example 2 completely removed carboxylated iron powder from the formulation and increased the amount of nickel-zinc ferrite to 14 parts. Tests showed a significant decrease in the electromagnetic wave shielding performance of the coating, while other properties remained unchanged. Simultaneously, another experiment was conducted with the amount of carboxylated iron powder in the formulation increased to 14 parts and the nickel-zinc ferrite removed; the test results were the same as above, and will not be elaborated further here. This indicates that the optimal electromagnetic wave shielding effect can only be achieved when carboxylated iron powder and nickel-zinc ferrite are used simultaneously in this formulation system, highlighting the importance of their synergistic effect.

[0076] Comparative Example 3 The components and weight percentages of the water-based electromagnetic shielding coating used in this comparative example for outdoor mobile base stations are as follows: Primer: Aqueous acrylic emulsion PR71K, 15 parts; Dispersant Tego760, 2 parts; Guangzhou Yinfeng Silver Powder, 3 servings; Guangzhou Yinfeng Silver-Packed Copper Powder, 75 portions; Anti-settling agent LAPONITE RDS, 0.3 parts; Defoamer Tego815N, 0.3 parts; Wetting and leveling agent Tego 450, 0.3 parts; Thickener RHEOVIS PU1191, 0.3 parts; 1 part of ethylene glycol monobutyl ether; Dipropylene glycol butyl ether, 2 parts; Deionized water, 0.8 parts; Topcoat: Component A: Aqueous acrylic dispersion Bayhydur XP 2655, 55 parts; Dispersant Tego760, 2 parts; Hebei extra-tough carboxylated iron powder, 7 parts; Hebei high-toughness nickel-zinc ferrite, 7 parts; Conductive carbon black VXC72, 2.5 parts; Xi'an Keneng Nano Silicon Carbide Powder, 0 parts; Shanghai Foreign Electric Hollow Glass Beads 2046H, 2.5 parts; Dongguan Lianding flame retardant LD-109, 2.5 parts; Anti-settling agent LAPONITE RDS, 0.3 parts; Defoamer Tego815N, 0.3 parts; Wetting and leveling agent Tego 450, 0.3 parts; Thickener RHEOVIS PU1191, 0.3 parts; 1 part of ethylene glycol monobutyl ether; Dipropylene glycol butyl ether, 1.5 parts; Deionized water, 17.8 parts; Component B: 100 parts of water-based curing agent.

[0077] Component A : Component B = 100 : 20 (by weight).

[0078] The preparation method of the water-based electromagnetic shielding coating for outdoor mobile base stations in this comparative example specifically includes the following steps: Primer: (1) Weigh a portion of the deionized water and add it to the tank; (2) Weigh the dispersant and defoamer and put them into the tank, then stir at low speed for 20 minutes; (3) Weigh the anti-settling agent, silver powder, and silver-coated copper powder and put them into the tank, then stir at low speed for 30 minutes; (4) The fineness of the slurry is mixed to below 15 micrometers using a mixer; (5) Add the slurry to the emulsion tank and stir at low speed for 30 minutes; (6) Add the water-based acrylic emulsion, wetting and leveling agent, film-forming aid, remaining deionized water and thickener into the tank, stir at low speed for 30 minutes, and it is done.

[0079] In steps (1)-(6) above, the low-speed stirring is 200-300 rpm, the medium-speed stirring is 300-500 rpm, and the high-speed stirring is 500-700 rpm.

[0080] Topcoat: (1) Weigh a portion of the deionized water and add it to the tank; (2) Weigh the dispersant and defoamer and put them into the tank, then stir at medium speed for 20 minutes; (3) Weigh the anti-settling agent, carboxylated iron powder, nickel-zinc ferrite, conductive carbon black, nano silicon carbide powder and flame retardant and put them into the cylinder, and stir at medium speed for 30 minutes. (4) Grind the slurry to a fineness of less than 20 micrometers using a grinding mill; (5) Add the slurry to the emulsion tank and stir at medium speed for 30 minutes; (6) Add the water-based acrylic dispersion, wetting and leveling agent, film-forming aid, hollow glass beads, remaining deionized water and thickener into the tank, stir at low speed for 30 minutes, and it is done.

[0081] In steps (1)-(6) above, the low-speed stirring is 200-300 rpm, the medium-speed stirring is 300-500 rpm, and the high-speed stirring is 500-700 rpm.

[0082] It should be noted separately that before applying the topcoat, components A and B should be mixed evenly according to their weight ratio.

[0083] The test results of the paint film performance of this comparative example are shown in Table 4 below.

[0084] Table 4. Test results of paint film performance in Comparative Example 3 Compared to Example 1, the electromagnetic wave shielding performance is reduced.

[0085] Comparative Example 3 completely removed nano-silicon carbide powder from the formulation, while the remaining components were the same as in Example 1. Test results showed that the electromagnetic wave shielding performance of the coating significantly decreased, while other properties remained normal. This indicates that nano-silicon carbide powder, as a key electromagnetic wave shielding filler, effectively shields electromagnetic waves through its spatial structure and particle size characteristics; its absence directly leads to the failure of the coating's core function.

[0086] Comparative Example 4 The components and weight percentages of the water-based electromagnetic shielding coating used in this comparative example for outdoor mobile base stations are as follows: Primer: Aqueous acrylic emulsion PR71K, 15 parts; Dispersant Tego760, 2 parts; Guangzhou Yinfeng Silver Powder, 3 servings; Guangzhou Yinfeng Silver-Packed Copper Powder, 75 portions; Anti-settling agent LAPONITE RDS, 0.3 parts; Defoamer Tego815N, 0.3 parts; Wetting and leveling agent Tego 450, 0.3 parts; Thickener RHEOVIS PU1191, 0.3 parts; 1 part of ethylene glycol monobutyl ether; Dipropylene glycol butyl ether, 2 parts; Deionized water, 0.8 parts; Topcoat: Component A: Aqueous acrylic dispersion Bayhydur XP 2655, 55 parts; Dispersant Tego760, 2 parts; Hebei extra-tough carboxylated iron powder, 7 parts; Hebei high-toughness nickel-zinc ferrite, 7 parts; Conductive carbon black VXC72, 2.5 parts; Xi'an Keneng Nano Silicon Carbide Powder, 7 parts; Shanghai Foreign Electric Hollow Glass Beads 2046H, 0 copies; Dongguan Lianding flame retardant LD-109, 2.5 parts; Anti-settling agent LAPONITE RDS, 0.3 parts; Defoamer Tego815N, 0.3 parts; Wetting and leveling agent Tego 450, 0.3 parts; Thickener RHEOVIS PU1191, 0.3 parts; 1 part of ethylene glycol monobutyl ether; Dipropylene glycol butyl ether, 1.5 parts; Deionized water, 13.3 parts; Component B: 100 parts of water-based curing agent.

[0087] Component A : Component B = 100 : 20 (by weight).

[0088] The preparation method of the water-based electromagnetic shielding coating for outdoor mobile base stations in this comparative example specifically includes the following steps: Primer: (1) Weigh a portion of the deionized water and add it to the tank; (2) Weigh the dispersant and defoamer and put them into the tank, then stir at low speed for 20 minutes; (3) Weigh the anti-settling agent, silver powder, and silver-coated copper powder and put them into the tank, then stir at low speed for 30 minutes; (4) The fineness of the slurry is mixed to below 15 micrometers using a mixer; (5) Add the slurry to the emulsion tank and stir at low speed for 30 minutes; (6) Add the water-based acrylic emulsion, wetting and leveling agent, film-forming aid, remaining deionized water and thickener into the tank, stir at low speed for 30 minutes, and it is done.

[0089] In steps (1)-(6) above, the low-speed stirring is 200-300 rpm, the medium-speed stirring is 300-500 rpm, and the high-speed stirring is 500-700 rpm.

[0090] Topcoat: (1) Weigh a portion of the deionized water and add it to the tank; (2) Weigh the dispersant and defoamer and put them into the tank, then stir at medium speed for 20 minutes; (3) Weigh the anti-settling agent, carboxylated iron powder, nickel-zinc ferrite, conductive carbon black, nano silicon carbide powder and flame retardant and put them into the cylinder, and stir at medium speed for 30 minutes. (4) Grind the slurry to a fineness of less than 20 micrometers using a grinding mill; (5) Add the slurry to the emulsion tank and stir at medium speed for 30 minutes; (6) Add the water-based acrylic dispersion, wetting and leveling agent, film-forming aid, hollow glass beads, remaining deionized water and thickener into the tank, stir at low speed for 30 minutes, and it is done.

[0091] In steps (1)-(6) above, the low-speed stirring is 200-300 rpm, the medium-speed stirring is 300-500 rpm, and the high-speed stirring is 500-700 rpm.

[0092] It should be noted separately that before applying the topcoat, components A and B should be mixed evenly according to their weight ratio.

[0093] The test results of the paint film performance of this comparative example are shown in Table 5 below.

[0094] Table 5. Test results of paint film performance in Comparative Example 4 Compared to Example 1, the thermal insulation performance is reduced.

[0095] Comparative Example 4 removed the hollow glass beads from the formulation, while the remaining components were the same as in Example 1. Test results showed that the thermal insulation performance of the coating (reduced thermal conductivity) decreased significantly, while other properties remained normal. This indicates that hollow glass beads can significantly reduce the thermal conductivity of the coating and improve its thermal insulation performance; their absence directly leads to the failure of the coating's core function.

[0096] Example 2 Compared to Example 1, most aspects are the same, except that the formula in this example is adjusted as follows: Primer: 15 parts of water-based acrylic emulsion, 2 parts of dispersant, 3 parts of silver powder, 75 parts of silver-coated copper powder, 0.3 parts of anti-settling agent, 0.3 parts of defoamer, 0.3 parts of wetting and leveling agent, 0.3 parts of thickener, 1 part of ethylene glycol monobutyl ether, 2 parts of dipropylene glycol butyl ether, and 0.8 parts of deionized water; Topcoat: Component A: 55 parts water-based acrylic dispersion, 2 parts dispersant, 6 parts carboxylated iron powder, 8 parts nickel-zinc ferrite, 2 parts conductive carbon black, 6 parts nano silicon carbide powder, 2.5 parts hollow glass beads, 2 parts flame retardant, 0.3 parts anti-settling agent, 0.3 parts defoamer, 0.3 parts wetting and leveling agent, 0.3 parts thickener, 1 part ethylene glycol monobutyl ether, 1.5 parts dipropylene glycol butyl ether, and 12.8 parts deionized water; Component B: 100 parts of water-based curing agent.

[0097] Component A : Component B = 100 : 20 (by weight).

[0098] Example 2, by adjusting the ratio of carboxylated iron powder and nickel-zinc ferrite in the formulation (6 parts and 8 parts respectively), and optimizing the amount of other components (such as 2 parts conductive carbon black, 6 parts nano silicon carbide powder, 2 parts flame retardant, etc.), achieved coating performance close to that of Example 1. This adjustment reflects the synergistic effect of carboxylated iron powder and nickel-zinc ferrite; the simultaneous use of both can significantly improve the coating's ability to shield electromagnetic waves.

[0099] Example 3 Compared to Example 1, most aspects are the same, except that the formula in this example is adjusted as follows: Primer: 10 parts water-based acrylic emulsion, 3 parts dispersant, 4 parts silver powder, 78.6 parts silver-coated copper powder, 0.3 parts anti-settling agent, 0.3 parts defoamer, 0.3 parts wetting and leveling agent, 0.3 parts thickener, 1 part ethylene glycol monobutyl ether, 2 parts dipropylene glycol butyl ether, and 0.2 parts deionized water; Topcoat: Component A: 50 parts water-based acrylic dispersion, 2 parts dispersant, 8 parts carboxylated iron powder, 6 parts nickel-zinc ferrite, 3 parts conductive carbon black, 8 parts nano silicon carbide powder, 2 parts hollow glass beads, 3 parts flame retardant, 0.3 parts anti-settling agent, 0.3 parts defoamer, 0.3 parts wetting and leveling agent, 0.3 parts thickener, 1 part ethylene glycol monobutyl ether, 1.5 parts dipropylene glycol butyl ether, and 14.3 parts deionized water; Component B: 100 parts of water-based curing agent.

[0100] Component A : Component B = 100 : 20 (by weight).

[0101] Example 3 achieved coating performance close to that of Example 1 by adjusting the ratio of carboxylated iron powder and nickel-zinc ferrite in the formulation (8 parts and 6 parts respectively), optimizing the dosage of other components (such as 50 parts of waterborne acrylic dispersion, 3 parts of conductive carbon black, 8 parts of nano-silicon carbide powder, 2 parts of hollow glass beads, 3 parts of flame retardant, etc.), and optimizing the dosage of components in the primer (such as 10 parts of waterborne acrylic emulsion, 4 parts of silver powder, and 78.6 parts of silver-coated copper powder). This adjustment reflects the synergistic effect of carboxylated iron powder and nickel-zinc ferrite; their combined use can significantly improve the coating's ability to shield electromagnetic waves.

[0102] Example 4 Compared to Example 1, most aspects are the same, except that the formula in this example is adjusted as follows: Primer: 20 parts of water-based acrylic emulsion, 2 parts of dispersant, 2 parts of silver powder, 70 parts of silver-coated copper powder, 0.3 parts of anti-settling agent, 0.3 parts of defoamer, 0.3 parts of wetting and leveling agent, 0.3 parts of thickener, 1 part of ethylene glycol monobutyl ether, 2 parts of dipropylene glycol butyl ether, and 1.8 parts of deionized water; Topcoat: Component A: 60 parts aqueous acrylic dispersion, 3 parts dispersant, 7 parts carboxylated iron powder, 7 parts nickel-zinc ferrite, 2.5 parts conductive carbon black, 7 parts nano silicon carbide powder, 3 parts hollow glass beads, 2.5 parts flame retardant, 0.3 parts anti-settling agent, 0.3 parts defoamer, 0.3 parts wetting and leveling agent, 0.3 parts thickener, 1 part ethylene glycol monobutyl ether, 1.5 parts dipropylene glycol butyl ether, and 4.3 parts deionized water; Component B: 100 parts of water-based curing agent.

[0103] Component A : Component B = 100 : 20 (by weight).

[0104] Example 4 adjusted the proportion of hollow glass beads in the formulation (3 parts), optimized the amount of other components (such as 60 parts of waterborne acrylic dispersion), and optimized the amount of components in the primer (such as 20 parts of waterborne acrylic emulsion, 2 parts of silver powder, and 70 parts of silver-coated copper powder) to make the coating performance similar to that of Example 1. This adjustment demonstrates that hollow glass beads can significantly improve the thermal insulation performance of the coating (reduce the thermal conductivity of the coating). In summary, compared with the prior art, the present invention has the advantages of good electromagnetic shielding effect, applicability to a wider range of electromagnetic waves, good adhesion to plastics and metals, good flame retardant and heat insulation effect, good water and salt spray resistance, good outdoor weather resistance, and good impact resistance. In addition, it adopts a water-based system, has low VOC, and is not flammable or explosive.

[0105] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A water-based electromagnetic shielding coating for outdoor mobile base stations, characterized in that, It consists of a primer and a topcoat; The primer comprises the following raw material components in parts by weight: 5-25 parts of water-based acrylic emulsion, 1-4 parts of dispersant, 1-5 parts of silver powder, 65-85 parts of silver-coated copper powder, 0.1-0.5 parts of anti-settling agent, 0.1-0.5 parts of defoamer, 0.1-0.5 parts of wetting and leveling agent, 0.1-0.5 parts of thickener, 1-4 parts of film-forming aid, and 0-5 parts of deionized water; the solid content of the water-based acrylic emulsion is 40-60%. The topcoat is composed of component A and component B, including the following raw material components in parts by weight; Component A: 40-70 parts of aqueous acrylic dispersion, 1-4 parts of dispersant, 5-10 parts of carboxylated iron powder, 5-10 parts of nickel-zinc ferrite, 1-4 parts of conductive carbon black, 5-10 parts of nano-silicon carbide powder, 1-4 parts of hollow glass beads, 1-4 parts of flame retardant, 0.1-0.5 parts of anti-settling agent, 0.1-0.5 parts of defoamer, 0.1-0.5 parts of wetting and leveling agent, 0.1-0.5 parts of thickener, 2-6 parts of film-forming aid, and 5-15 parts of deionized water; the solid content of the aqueous acrylic dispersion is 35-55%. Component B: 100 parts of water-based curing agent; the water-based curing agent is a water-based HDI curing agent with a solid content of 100%.

2. The water-based electromagnetic shielding coating for outdoor mobile base stations according to claim 1, characterized in that, The water-based electromagnetic shielding coating is composed of the following raw material components in parts by weight: Primer: 10-20 parts of water-based acrylic emulsion, 2-3 parts of dispersant, 2-4 parts of silver powder, 70-80 parts of silver-coated copper powder, 0.2-0.4 parts of anti-settling agent, 0.2-0.4 parts of defoamer, 0.2-0.4 parts of wetting and leveling agent, 0.2-0.4 parts of thickener, 3-5 parts of film-forming aid, and 0-3 parts of deionized water; Topcoat: Component A: 50-60 parts of water-based acrylic dispersion, 2-3 parts of dispersant, 6-8 parts of carboxylated iron powder, 6-8 parts of nickel-zinc ferrite, 2-3 parts of conductive carbon black, 6-8 parts of nano-silicon carbide powder, 2-3 parts of hollow glass beads, 2-3 parts of flame retardant, 0.2-0.4 parts of anti-settling agent, 0.2-0.4 parts of defoamer, 0.2-0.4 parts of wetting and leveling agent, 0.2-0.4 parts of thickener, 2-3 parts of film-forming aid, and 7-13 parts of deionized water; Component B: 100 parts of water-based curing agent; Curing weight ratio: Component A: Component B = 100:

20.

3. The water-based electromagnetic shielding coating for outdoor mobile base stations according to claim 1, characterized in that, The aqueous acrylic emulsion is PR71K, with a solid content of 45-55%. The aqueous acrylic dispersion is Bayhydur A2470, with a solid content of 40-50%. The water-based curing agent is Bayhydur XP 2655, with a solid content of 100%.

4. The water-based electromagnetic shielding coating for outdoor mobile base stations according to claim 1, characterized in that, The silver powder and silver-coated copper powder have a particle size of 10 micrometers.

5. The water-based electromagnetic shielding coating for outdoor mobile base stations according to claim 1, characterized in that, The carboxylated iron powder and nickel-zinc ferrite have a particle size of 1-3 micrometers.

6. The water-based electromagnetic shielding coating for outdoor mobile base stations according to claim 1, characterized in that, The conductive carbon black is VXC72; The hollow glass beads are 2046H with a particle size of 20 micrometers; The flame retardant is LD-109.

7. The water-based electromagnetic shielding coating for outdoor mobile base stations according to claim 1, characterized in that, The dispersant is Tego760; The anti-settling agent is LAPONITE RDS; The defoamer is Tego815N; The wetting and leveling agent is Tego450; The thickener is RHEOVIS PU1191.

8. The water-based electromagnetic shielding coating for outdoor mobile base stations according to claim 1, characterized in that, The film-forming aid is a compound of ethylene glycol monobutyl ether and dipropylene glycol butyl ether in a mass ratio of 1:1-2.

9. A method for preparing an aqueous electromagnetic shielding coating for outdoor mobile base stations as described in any one of claims 1-8, characterized in that, Includes the following steps: S1: Primer S11: Pour some deionized water into a container; S12: Add dispersant, defoamer, anti-settling agent, silver powder, and silver-coated copper powder to the container in sequence, and stir evenly to obtain primer slurry; S13: Add the primer slurry to the emulsion tank, then add the water-based acrylic emulsion, wetting and leveling agent, film-forming aid and thickener, and add the remaining deionized water. Stir and mix to obtain the primer. S2: Topcoat S21: Pour some deionized water into a container; S22: Add dispersant, defoamer, anti-settling agent, carboxylated iron powder, nickel-zinc ferrite, conductive carbon black, nano silicon carbide powder, and flame retardant in sequence, stir evenly and grind to obtain topcoat slurry; S23: Add the topcoat slurry to the emulsion tank, then add the water-based acrylic dispersion, wetting and leveling agent, film-forming aid, hollow glass beads and thickener, and add the remaining deionized water. Stir and mix to obtain component A of the topcoat. S24: Mix components A and B thoroughly before applying the topcoat.

10. The application of a water-based electromagnetic shielding coating for outdoor mobile base stations as described in any one of claims 1-8 on the metal or plastic surface of an outdoor mobile base station.

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