A high weather resistance radar cover and preparation method thereof

Abstract

The present invention provides a high weather resistance radome and a preparation method thereof, comprising a glass fiber reinforced plastic shell and a primer coating, a mid-coat coating and a top coating sequentially arranged on the surface of the glass fiber reinforced plastic shell, wherein the raw materials of the mid-coat coating include, by weight: 40-60 parts of inorganic ceramic resin, 3-6 parts of color paste, 1-3 parts of whisker silicon, 2-6 parts of boron nitride, 8-12 parts of titanium dioxide, 0.5-2 parts of thickener, 1-3 parts of defoamer, 2-4 parts of mica, 1-3 parts of modified silica, 1-3 parts of silane coupling agent, and 15-25 parts of anhydrous ethanol. The radome provided by the present invention has a significant improvement in high temperature resistance and better weather resistance. At the same time, by modifying silica, the coating is more firmly bonded and can be better attached to the glass fiber reinforced plastic surface.

Description

Technical Field

[0001] The present invention belongs to the technical field of radomes, and in particular relates to a highly weather-resistant radome and a preparation method thereof. Background Art

[0002] The radome is a window for electromagnetic waves. Its function is to protect the antenna and prevent the environment from affecting and interfering with the working state of the radar antenna, thereby reducing the power to drive the antenna to operate, improving its working reliability, and ensuring that the radar antenna works around the clock. With the development of science and technology, radar has played an important role in aircraft, missiles, navigation and other fields. Therefore, in order to ensure the best radar effect, the requirements for radomes are becoming increasingly higher.

[0003] The Chinese utility model patent with application number 202022532331.3 discloses a radome, which adopts a structure combining a tetrafluorocarbon coating, a wave-transmitting coating, a primer coating and a fiberglass shell. The tetrafluorocarbon coating is used to protect the internal structure, improve the weather resistance and wave transmission performance of the radome, and the polyurethane coating is used to improve the adhesion between the coating and the shell.

[0004] The Chinese invention patent with application number 201610617071.5 discloses a coating construction process for radar covers. The thinners of ethyl acetate and PMA are used to dissolve the coating well and control the drying time of the paint film. The price is low. The coating contains nano-conductive powder, which makes the coating have anti-static properties. At the same time, by controlling the number and thickness of spraying the coating, as well as the interval time of the spraying process, the weight is reduced and a good radar wave transmittance is guaranteed. It has good market potential.

[0005] The above patents all spray paint on the surface of the radome to improve the performance of the radome. However, due to the increasingly wide range of uses of the radome, higher requirements have been placed on the weather resistance of the radome, especially the high temperature resistance. At the same time, the demand for the firmness of the fiberglass surface coating of the radome is also increasing.

[0006] Therefore, the technical problem that needs to be solved urgently is how to improve the weather resistance of the radome and the firmness of the fiberglass reinforced plastics and coating of the radome. Summary of the invention

[0007] In view of the defects of the prior art, the purpose of the present invention is to provide a highly weather-resistant radome and a preparation method thereof, which can improve the high temperature resistance of the radome and increase the adhesion strength between the fiberglass reinforced plastics of the radome and the coating.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] On the one hand, the present application provides a highly weather-resistant radome, comprising a fiberglass shell and a primer coating, a mid-coat coating and a top-coat coating sequentially arranged on the surface of the fiberglass shell; the raw materials of the mid-coat coating include, by weight: 40-60 parts of inorganic ceramic resin, 3-6 parts of color paste, 1-3 parts of whisker silicon, 2-6 parts of boron nitride, 8-12 parts of titanium dioxide, 0.5-2 parts of thickener, 1-3 parts of defoaming agent, 2-4 parts of mica, 1-3 parts of modified silica, 1-3 parts of silane coupling agent, and 15-25 parts of anhydrous ethanol.

[0010] With the development of science and technology, the use scenarios of radomes are becoming more and more extensive, and users' requirements for the stability of radomes are gradually increasing. In the present invention, the applicant significantly improves the stability of the radome by modifying the silica in the intermediate coating on the surface of the radome. At the same time, it is unexpectedly found that the bonding strength between the coatings and between the coatings and the radome is significantly enhanced. It is speculated that the possible reason is that the modified silica contains phenyl, and the aromaticity of phenyl has strong stability. At the same time, 4-phenyl 3-butenoic acid is also connected with a carboxyl group, which can react with the hydroxyl group on the surface of the fiberglass and the hydroxyl group of the epoxy resin, which significantly improves the adsorption capacity of the coating and can well prevent the coating from falling off.

[0011] In some embodiments, the raw material of the primer coating is modified epoxy resin.

[0012] Epoxy resin has good physical and mechanical properties and bonding properties with various materials. However, epoxy resin has poor high temperature resistance and strong hydrophilicity, and is easy to absorb moisture in a humid environment. The applicant has significantly improved the high temperature resistance of the radome by modifying the epoxy resin. At the same time, it can reduce the moisture absorption performance of the radome, prevent the radome from getting damp or water droplets from appearing inside the radome, which directly affects the decrease in the radome's wave transmittance and shortens the radar detection distance. It is speculated that the possible reason is that the triazine ring on cyanuric chloride has a certain effect on improving the high temperature resistance. At the same time, the highly hydrophilic hydroxyl groups in the epoxy resin participate in the reaction and combine with the silane coupling agent, so it is not easy to be affected by moisture, thus avoiding the increase in the dielectric constant of the radome after moisture absorption, which affects the wave transmittance.

[0013] In some embodiments, the raw materials of the top coating layer include, by weight: 60-80 parts of inorganic ceramic resin, 18-22 parts of isopropyl alcohol, 3-8 parts of DBS solvent, 2-4 parts of propylene glycol methyl ether, and 1-4 parts of polydimethylsilicone oil.

[0014] Preferably, the inorganic ceramic resin is MA180 or AF901.

[0015] The applicant has improved the corrosion resistance of the coating by selecting inorganic ceramic resin MA180 or AF901. After film formation, the coating is smooth and dense, which can well protect the radar cover and also plays a certain role in fire retardancy and high temperature resistance. At the same time, AF901 has strong hydrophobicity and can significantly reduce the moisture absorption of the radar.

[0016] In some embodiments, the preparation method of the modified epoxy resin is as follows:

[0017] (1) Mix cyanuric chloride, vinyl triethoxysilane, tri(dibenzylideneacetone) dipalladium, tri-tert-butylphosphine, cesium carbonate and dioxane, heat to 100-130° C., stir for 24-26 hours, extract the reaction solution after the reaction is completed, concentrate the organic phase under reduced pressure and dry it, and separate it by column chromatography to obtain product A;

[0018] (2) Add epoxy resin to the product A in step (1), heat to 75-90° C., stir for 2-3 hours to mix evenly, and cool to obtain the modified epoxy resin.

[0019] Preferably, the epoxy resin is bisphenol A epoxy resin.

[0020] The applicant reacts vinyl triethoxysilane with epoxy resin. The silanol produced after the hydrolysis of triethoxy can react with the hydroxyl groups on the surface of the epoxy resin to form ether. At the same time, the chlorine on cyanuric chloride and the double bond of vinyl triethoxysilane can undergo a Heck reaction to finally generate a modified epoxy resin, which can significantly improve the high temperature resistance of the coating.

[0021] In some embodiments, the mass ratio of cyanuric chloride, cesium carbonate and vinyltriethoxysilane is 1:(1.8-2.1):(2.0-2.2).

[0022] The applicant increases the reaction yield of cyanuric chloride and vinyltriethoxysilane by adjusting the mass ratio of cyanuric chloride, cesium carbonate and vinyltriethoxysilane.

[0023] In some embodiments, the preparation method of the modified silicon dioxide is as follows:

[0024] I. Add silicon dioxide to benzene, add thionyl chloride under the protection of inert gas, react at 50-70°C for 4-5h, centrifuge after the reaction, and dry the precipitate in a vacuum oven at 60-80°C for 20-24h to obtain product A;

[0025] II. Add the product A obtained in step S1 and 2,4,6-trimethylbenzophenone to DMSO, heat to 35-60°C, and stir for 22-26h to obtain a single layer of silica grafted with 2,4,6-trimethylbenzophenone;

[0026] III. Add 4-phenyl-3-butenoic acid to the single-layer silica grafted with 2,4,6-trimethylbenzophenone obtained in step II, and react under 250-320 nm ultraviolet light for 2-5 hours to obtain modified silica.

[0027] Silica is usually added as a filler to improve the hardness of the radome coating. However, as the use of radomes becomes more and more extensive, the radome coating requires not only higher mechanical strength but also stronger stability. The applicant reacts silica with thionyl chloride to form Si-Cl bonds, and then reacts it with 2,4,6-trimethylbenzophenone containing an α-olefin group to obtain a single-layer silica grafted with 2,4,6-trimethylbenzophenone. The silica modified with 2,4,6-trimethylbenzophenone can induce the polymerization of 4-phenyl 3-butenoic acid under ultraviolet light to finally obtain modified silica. The aromatic phenyl group in the modified silica significantly improves the stability of the radome. At the same time, the carboxyl group can react with the hydroxyl group on the surface of the glass fiber reinforced plastic to enhance the adsorption capacity of the coating on the surface of the glass fiber reinforced plastic, thereby avoiding shedding.

[0028] In some embodiments, the mass ratio of silicon dioxide to thionyl chloride in step I is 1:

[0029] (0.08-0.12).

[0030] The applicant increases the Si-Cl bond content in the silica after the reaction by adjusting the mass ratio of silica to thionyl chloride, which is beneficial to the grafting of 2,4,6-trimethylbenzophenone onto silica.

[0031] In some embodiments, the mass ratio of the silicon dioxide monolayer grafted with 2,4,6-trimethylbenzophenone to 4-phenyl-3-butenoic acid in step III is 1:(1.5-5).

[0032] The applicant adjusted the mass ratio of the silicon dioxide grafted with 2,4,6-trimethylbenzophenone and 4-phenyl-3-butenoic acid to achieve the best effect of initiating the polymerization of 4-phenyl-3-butenoic acid and improve the yield of modified silicon dioxide.

[0033] In some embodiments, the thickness of the primer coating is 20-30 μm; the thickness of the mid-coat coating is 20-30 μm; and the thickness of the top-coat coating is 20-30 μm.

[0034] The applicant adjusts the thickness of each coating layer to make the coating have the best high temperature resistance.

[0035] On the other hand, the present application provides a method for preparing a highly weather-resistant radome, which specifically comprises the following steps:

[0036] S1. Wash the surface of FRP with water, dry it, and cool it to 20-30℃ for later use;

[0037] S2. Blow deionized air to the surface of the FRP shell to remove static electricity on the surface of the FRP;

[0038] S3. Spray the primer coating on the FRP shell at 26-30°C to form a primer coating;

[0039] S4. Place the sprayed FRP shell in an oven at 50-70°C for 2-4 hours, and cool to 25-30°C after curing;

[0040] S6. Spray the intermediate coating on the surface of the primer coating at 26-30°C to form an intermediate coating, and repeat step S4;

[0041] S7. Spray the topcoat coating on the surface of the midcoat coating at 26-30° C. to form a topcoat coating, and repeat step S4 to obtain a highly weather-resistant radome.

[0042] Beneficial effects:

[0043] 1. The radome of the present invention has significantly improved high temperature resistance and better weather resistance, and at the same time makes the combination of the coating and the fiberglass more firm and can better adhere to the surface of the fiberglass;

[0044] 2. The present invention improves the high temperature resistance of the radome coating by modifying the epoxy resin, and has a wider application range. At the same time, it also has a certain effect on reducing the moisture absorption, thereby preventing the dielectric constant of the radome from increasing after moisture absorption and affecting the wave transmittance;

[0045] 3. The present invention modifies silicon dioxide and grafts aromatic phenyl groups, thereby improving the overall stability of the radome coating. At the same time, carboxylic acid can react with glass fiber reinforced plastics, so that the coating can have a better adsorption effect on the surface of the glass fiber reinforced plastics, and the adhesion is more firm and not easy to fall off. DETAILED DESCRIPTION

[0046] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention and are only used to illustrate the present invention, but not to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0047] According to the ratio of each component specified in the following examples, a radome coating is prepared. The components of the radome coating are prepared by mixing according to the methods described in the examples and comparative examples.

[0048] Preparation Example 1

[0049] Modified epoxy resin A was prepared as follows:

[0050] (1) 18 g of cyanuric chloride, 38 g of vinyl triethoxysilane, 4 g of tri(dibenzylideneacetone)dipalladium, 1.2 g of tri-tert-butylphosphine, 35 g of cesium carbonate, and 88 g of dioxane were mixed, heated to 120° C., and stirred for 24 h. After the reaction was completed, the reaction solution was extracted with dichloromethane, the organic phase was concentrated and dried under reduced pressure, and product A was obtained after column chromatography separation;

[0051] (2) Add 10 g of bisphenol A epoxy resin to 5 g of product A in step (1), heat to 85° C., stir for 2 h to mix evenly, and cool to obtain modified epoxy resin A.

[0052] Preparation Example 2

[0053] Modified epoxy resin B, the specific implementation manner is the same as that of Preparation Example 1, except that the amount of vinyltriethoxysilane is 50 g.

[0054] Preparation Example 3

[0055] Modified silica A was prepared as follows:

[0056] I. Add 2.5 g of silicon dioxide to 100 ml of benzene, add 0.25 g of thionyl chloride under N2 gas protection, react at 60°C for 4.5 h, centrifuge after the reaction, and dry the precipitate in a vacuum oven at 70°C for 22 hours to obtain product A;

[0057] II. 1 g of the product A obtained in step S1 and 0.15 g of 2,4,6-trimethylbenzophenone were added to 100 ml of DMSO, heated to 40 ° C, and stirred for 24 h to obtain a single layer of silica grafted with 2,4,6-trimethylbenzophenone;

[0058] III. Add 30 g of 4-phenyl-3-butenoic acid to 10 g of the single-layer grafted 2,4,6-trimethylbenzophenone silica A obtained in step II, and irradiate with ultraviolet light at 300 nm for 4 h to obtain modified silica A.

[0059] Preparation Example 4

[0060] Modified silica B, the specific implementation method is the same as that of Preparation Example 3, except that the amount of thionyl chloride is 0.5 g.

[0061] Preparation Example 5

[0062] Modified silica C, the specific implementation method is the same as that of Preparation Example 3, except that the amount of 4-phenyl-3-butenoic acid is 10 g.

[0063] Example 1

[0064] The present embodiment provides a high weather resistance radome coating, comprising a glass fiber reinforced plastic shell and a primer coating, a mid-coat coating and a top-coat coating sequentially arranged on the surface of the glass fiber reinforced plastic shell; in parts by weight, the raw materials of the mid-coat coating include: 50 parts of inorganic ceramic resin MA180, 5 parts of color paste, 2 parts of whisker silicon, 4 parts of boron nitride, 10 parts of titanium dioxide, 1 part of sodium polyacrylate, 2 parts of polyoxypropylene glycerol ether, 3 parts of mica, 2 parts of modified silica A, 2 parts of KH-560, and 20 parts of anhydrous ethanol.

[0065] Among them, in parts by weight, the raw material of the primer coating is modified epoxy resin A; the raw materials of the top coating include: 70 parts of inorganic ceramic resin AF901, 20 parts of isopropyl alcohol, 5 parts of DBS solvent, 3 parts of propylene glycol methyl ether, and 2 parts of polydimethylsilicone oil.

[0066] The method for preparing the highly weather-resistant radome of this embodiment specifically comprises the following steps:

[0067] S1. Wash the surface of the FRP with water, dry it, and cool it to 25℃ for later use;

[0068] S2. Blow deionized air to the surface of the FRP shell to remove static electricity on the surface of the FRP;

[0069] S3. The modified epoxy resin A was sprayed on the radome at 28°C to form a primer coating having a thickness of 25 μm;

[0070] S4. Place the sprayed FRP shell in a 60°C oven for curing for 3h, and cool to 35°C after curing;

[0071] S6. The inorganic ceramic resin MA180, color paste, silicon whiskers, boron nitride, titanium dioxide, sodium polyacrylate, polyoxypropylene glycerol ether, mica, modified silica A, KH-560 silane coupling agent and anhydrous ethanol were placed in a reaction kettle and stirred for 4 hours to form a mid-coat coating;

[0072] S7. The midcoat is sprayed on the surface of the primer coating to form a midcoat coating having a thickness of 25 μm. The spraying temperature is 30 ° C. The sprayed FRP shell is placed in a 60 ° C oven for curing for 2h. After curing, the temperature is lowered to 30 ° C.

[0073] S8. Inorganic ceramic resin AF901, isopropyl alcohol, DBS solvent, propylene glycol methyl ether and polydimethylsilicone oil are placed in a reactor and stirred for 4 hours to form a top coating. The top coating is sprayed on the surface of the mid-coat to form a top coating with a thickness of 25 μm. The spraying temperature is 28°C. The sprayed FRP shell is placed in a 60°C oven for curing for 2 hours. After curing, the temperature is lowered to 30°C to obtain a highly weather-resistant radar cover.

[0074] Example 2

[0075] The present embodiment provides a high weather resistance radome coating, comprising a glass fiber reinforced plastic shell and a primer coating, a mid-coat coating and a top-coat coating sequentially arranged on the surface of the glass fiber reinforced plastic shell; in parts by weight, the raw materials of the mid-coat coating include: 40 parts of inorganic ceramic resin MA180, 3 parts of color paste, 1 part of whisker silicon, 2 parts of boron nitride, 8 parts of titanium dioxide, 0.5 parts of sodium polyacrylate, 1 part of polyoxypropylene glycerol ether, 2 parts of mica, 1 part of modified silicon dioxide A, 1 part of KH-560, 15 parts of anhydrous ethanol,

[0076] Among them, in parts by weight, the raw material of the primer coating is modified epoxy resin A; the raw materials of the top coating include: 60 parts of inorganic ceramic resin AF901, 18 parts of isopropyl alcohol, 3 parts of DBS solvent, 2 parts of propylene glycol methyl ether, and 1 part of polydimethylsilicone oil.

[0077] The high weather resistance radome of this embodiment specifically includes the following steps:

[0078] S1. Wash the surface of the FRP with water, dry it, and cool it to 20℃ for later use;

[0079] S2. Blow deionized air to the surface of the FRP shell to remove static electricity on the surface of the FRP;

[0080] S3. The modified epoxy resin A was sprayed on the radome at 26°C to form a primer coating having a thickness of 20 μm;

[0081] S4. Place the sprayed FRP shell in a 60°C oven for curing for 3 hours, and cool to 30°C after curing;

[0082] S6. Inorganic ceramic resin MA180, color paste, silicon whiskers, boron nitride, titanium dioxide, sodium polyacrylate, polyoxypropylene glycerol ether, mica, modified silica A, KH-560 silane coupling agent and anhydrous ethanol were placed in a reaction kettle and stirred for 2 hours to form a mid-coat coating;

[0083] S7. The midcoat is sprayed on the surface of the primer coating to form a midcoat coating having a thickness of 20 μm. The spraying temperature is 30 ° C. The sprayed FRP shell is placed in a 60 ° C oven for curing for 2 h. After curing, the temperature is lowered to 30 ° C.

[0084] S8. Inorganic ceramic resin AF901, isopropyl alcohol, DBS solvent, propylene glycol methyl ether and polydimethylsilicone oil are placed in a reactor and stirred for 4 hours to form a top coating. The top coating is sprayed on the surface of the mid-coat to form a top coating with a thickness of 20 μm. The spraying temperature is 28°C. The sprayed FRP shell is placed in a 60°C oven for curing for 2 hours. After curing, the temperature is lowered to 30°C to obtain a highly weather-resistant radar cover.

[0085] Example 3

[0086] The present embodiment provides a high weather resistance radome coating. The raw materials of the mid-coat coating include, by weight: 60 parts of inorganic ceramic resin MA180, 6 parts of color paste, 3 parts of whisker silicon, 6 parts of boron nitride, 12 parts of titanium dioxide, 2 parts of sodium polyacrylate, 3 parts of polyoxypropylene glycerol ether, 4 parts of mica, 3 parts of modified silica A, 3 parts of KH-560, and 25 parts of anhydrous ethanol.

[0087] Among them, in parts by weight, the raw material of the primer coating is modified epoxy resin A; the raw materials of the top coating include: 80 parts of inorganic ceramic resin AF901, 22 parts of isopropyl alcohol, 8 parts of DBS solvent, 4 parts of propylene glycol methyl ether, and 4 parts of polydimethylsilicone oil.

[0088] The high weather resistance radome of this embodiment specifically includes the following steps:

[0089] S1. Wash the surface of FRP with water, dry it, and cool it to 30℃ for later use;

[0090] S2. Blow deionized air to the surface of the FRP shell to remove static electricity on the surface of the FRP;

[0091] S3. The modified epoxy resin A was sprayed on the radome at 30°C to form a primer coating having a thickness of 30 μm;

[0092] S4. Place the sprayed FRP shell in a 95°C oven for 4 hours and cool to 40°C after curing.

[0093] S6. The inorganic ceramic resin MA180, color paste, silicon whiskers, boron nitride, titanium dioxide, sodium polyacrylate, polyoxypropylene glycerol ether, mica, modified silica A, KH-560 silane coupling agent and anhydrous ethanol were placed in a reaction kettle and stirred for 6 hours to form a mid-coat coating;

[0094] S7. The midcoat is sprayed on the surface of the primer coating to form a midcoat coating having a thickness of 30 μm. The spraying temperature is 30 ° C. The sprayed FRP shell is placed in a 60 ° C oven for curing for 2 h. After curing, the temperature is lowered to 30 ° C.

[0095] S8. Inorganic ceramic resin AF901, isopropyl alcohol, DBS solvent, propylene glycol methyl ether and polydimethylsilicone oil are placed in a reactor and stirred for 4 hours to form a top coating. The top coating is sprayed on the surface of the mid-coat to form a top coating with a thickness of 30 μm. The spraying temperature is 28°C. The sprayed fiberglass shell is placed in a 60°C oven for curing for 2 hours. After curing, the temperature is lowered to 30°C to obtain a highly weather-resistant radar cover.

[0096] Example 4

[0097] This embodiment provides a high weather resistance radome coating and a preparation method thereof. The specific implementation method is the same as that of Embodiment 1, except that in step S3, an equal amount of modified epoxy resin B replaces modified epoxy resin A.

[0098] Example 5

[0099] This embodiment provides a high weather resistance radome coating and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that in step S3, an equal amount of commercially available bisphenol A epoxy resin is used to replace modified epoxy resin A.

[0100] Example 6

[0101] This embodiment provides a highly weather-resistant radome coating and a preparation method thereof. The specific implementation method is the same as that of Embodiment 1, except that in step S6, an equal amount of modified silica B replaces modified silica A.

[0102] Example 7

[0103] This embodiment provides a highly weather-resistant radome coating and a preparation method thereof. The specific implementation method is the same as that of Embodiment 1, except that in step S6, an equal amount of modified silica C replaces modified silica A.

[0104] Comparative Example 1

[0105] This comparative example provides a high weather resistance radome coating and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that in step S6, an equal amount of commercially available silica is used to replace modified silica A.

[0106] Performance Test:

[0107] The fiberglass radomes described in the above-mentioned embodiments 1-7 and comparative example 1 were subjected to adhesion tests and high temperature resistance tests. The test results are shown in Table 1.

[0108] (1) Adhesion test:

[0109] Test the adhesion grade according to GB / T9286-1998.

[0110] (2) High temperature resistance test:

[0111] The high temperature resistance is tested according to GB / T 27761-2011 Thermogravimetric Analyzer Weight Loss and Residue Test Method Standard. The temperature at which the mass of the FRP radome begins to change is tested and recorded using a thermogravimetric analyzer, and is recorded as the maximum operating temperature.

[0112] Table 1

[0113]

[0114]

[0115] It can be seen from Table 1 that in the present invention, the radomes of Examples 1-3 have better effects, and modified epoxy resin A and modified silica A are selected. The floating roller peeling strength is relatively high, and the coating adhesion on the fiberglass surface of the radome is relatively strong. At the same time, the maximum operating temperature is also relatively high, and it has better high temperature resistance.

[0116] In Examples 4-5, modified epoxy resin B and commercially available epoxy resin were used respectively. The maximum operating temperature of the radome was significantly reduced, and the high temperature resistance was poor. The modified epoxy resin B changed the proportion of the main components in the preparation process of the modified epoxy resin, resulting in a decrease in the high temperature resistance, but the adhesion of the coating was not affected.

[0117] In Examples 6-7 and Comparative Example 1, modified silica B, modified silica C and commercially available silica were used respectively, and the peel strength of the coating decreased significantly. Modified silica B and modified silica C changed the proportion of the main components in the preparation process, resulting in a decrease in the adhesion of the coating.

[0118] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A highly weather-resistant radome, characterized in that: It includes a glass fiber reinforced plastic shell and a primer coating, a mid-coat coating and a top-coat coating sequentially arranged on the surface of the glass fiber reinforced plastic shell; The raw materials of the intermediate coating layer include, by weight: 40-60 parts of inorganic ceramic resin, 3-6 parts of color paste, 1-3 parts of whisker silicon, 2-6 parts of boron nitride, 8-12 parts of titanium dioxide, 0.5-2 parts of thickener, 1-3 parts of defoamer, 2-4 parts of mica, 1-3 parts of modified silicon dioxide, 1-3 parts of silane coupling agent, and 15-25 parts of anhydrous ethanol; The raw material of the primer coating is modified epoxy resin; The preparation method of the modified epoxy resin is specifically as follows: (1) Mix cyanuric chloride, vinyl triethoxysilane, tri(dibenzylideneacetone) dipalladium, tri-tert-butylphosphine, cesium carbonate and dioxane, heat to 100-130° C., stir for 24-26 hours, extract the reaction solution after the reaction is completed, concentrate the organic phase under reduced pressure and dry it, and separate it by column chromatography to obtain product A; (2) adding epoxy resin to the product A in step (1), heating to 75-90° C., stirring for 2-3 hours to mix evenly, and cooling to obtain a modified epoxy resin; The mass ratio of cyanuric chloride, cesium carbonate and vinyl triethoxysilane is 1: (1.8-2.1): (2.0-2.2); The preparation method of the modified silicon dioxide is specifically as follows: I. Add silicon dioxide to benzene, add thionyl chloride under the protection of inert gas, react at 50-70°C for 4-5h, centrifuge after the reaction, and dry the precipitate in a vacuum oven at 60-80°C for 20-24h to obtain product A; II. Add the product A obtained in step S1 and 2,4,6-trimethylbenzophenone to DMSO, heat to 35-60°C, and stir for 22-26h to obtain a single layer of silica grafted with 2,4,6-trimethylbenzophenone; III. Add 4-phenyl-3-butenoic acid to the monolayer of 2,4,6-trimethylbenzophenone grafted silica obtained in step II, and react under 250-320nm ultraviolet light for 2-5h to obtain modified silica; The mass ratio of silicon dioxide to thionyl chloride in step I is 1:(0.08-0.12); In the step III, the mass ratio of the silicon dioxide grafted with the monolayer of 2,4,6-trimethylbenzophenone to 4-phenyl-3-butenoic acid is 1:(1.5-5).

2. The high weather resistance radome according to claim 1, characterized in that: Calculated by weight, the raw materials of the top coating layer include: 60-80 parts of inorganic ceramic resin, 18-22 parts of isopropyl alcohol, 3-8 parts of DBS solvent, 2-4 parts of propylene glycol methyl ether, and 1-4 parts of polydimethylsilicone oil.

3. The high weather resistance radome according to claim 1, characterized in that: The thickness of the primer coating is 20-30 μm; the thickness of the mid-coat coating is 20-30 μm; and the thickness of the top coating is 20-30 μm.

4. A method for preparing a highly weather-resistant radome according to any one of claims 1 to 3, characterized in that: The preparation method specifically comprises the following steps: S1. Wash the surface of FRP with water, dry it, and cool it to 20-30℃ for later use; S2. Blow deionized air to the surface of the FRP shell to remove static electricity on the surface of the FRP; S3. Spray the primer coating on the FRP shell at 26-30°C to form a primer coating; S4. Place the sprayed FRP shell in an oven at 50-70°C for 2-4 hours, and cool to 25-30°C after curing; S6. Spray the intermediate coating on the surface of the primer coating at 26-30°C to form an intermediate coating, and repeat step S4; S7. Spray the topcoat coating on the surface of the midcoat coating at 26-30° C. to form a topcoat coating, and repeat step S4 to obtain a highly weather-resistant radome.

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