High-temperature-resistant low-dielectric-loss cyanate ester-based composite material and application thereof to radar-resistant high-power-density radome

Abstract

The invention provides a high-temperature-resistant low-dielectric-loss cyanate ester-based composite material and application thereof to a radar-resistant high-power-density antenna housing, and meets the requirement of continuously improving the transmission power of antenna signals on the power-resistant performance of the antenna housing. The high-temperature-resistant low-dielectric-loss cyanate ester-based composite material disclosed by the invention is composed of a prepreg plate, a glue film and a honeycomb, matrix resins of the prepreg plate, the adhesive film and the honeycomb are all modified cyanate ester-based resins; the modified cyanate ester-based resin is prepared by blending and modifying benzoxazine resin, bismaleimide resin, phenolic resin, polyimide resin and cyanate ester resin. The cyanate ester-based composite material with high temperature resistance and low dielectric loss has the advantages of high wave transmission rate, low reflectivity, low thermal conversion efficiency, high heat dissipation efficiency and excellent heat resistance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of radomes, and particularly relates to a cyanate-based composite material with high temperature resistance and low dielectric loss and application thereof to a radar high-power-density-resistant radome. BACKGROUND

[0002] Under the action of strong electromagnetic pulse radiation, a radar radome wave-transparent composite material will generate a large amount of electromagnetic heat, and the temperature will rise. At the same time, the honeycomb and skin in the existing radar cover structure have very low thermal conductivity, which leads to blocked heat dissipation, heat accumulation, further temperature rise, and ablation of the structure inside the temperature exceeding the temperature resistance limit of the material, resulting in failure of the radar radome wave-transparent performance and even overall destruction. Therefore, it is urgent to develop a composite material that can resist radar high power density, meet high wave-transparency, low heat conversion efficiency, low reflectivity, high heat dissipation efficiency and high temperature resistance.

[0003] The cyanate resin has excellent electrical properties, with a dielectric constant of ε (2.7~3.4) and a dielectric loss tangent of tgδ (0.002~0.006), and also has excellent mechanical properties and temperature resistance. After modification, the glass transition temperature (Tg) can reach more than 300℃, which can meet the long-term use requirement at about 250℃.

[0004] CN115723386A discloses a composite material for a radome, a power-resistant radome and a preparation method thereof. The composite material includes a plurality of skin layers and a foam core layer. The skin layers and the foam core layer are spaced apart from each other, and the inner and outer layers are skin layers. The skin layer is composed of a silicon resin and a plurality of layers of fiber cloth. The preparation method comprises the following steps: preparing a silicon resin composition, and layer-by-layer compounding the silicon resin composition and the fiber cloth; taking the inner and outer layers as the skin layers, and alternately layering the skin layers and the foam core layer to form a preform; and heating and pressurizing the preform to obtain a power-resistant composite material radome. The advantages are that the silicon resin material has low dielectric constant and low loss tangent, so the heat conversion rate is low, and due to its high heat resistance, it can resist high-power electromagnetic waves and avoid damage to the radome. At the same time, the use of silicon resin and multi-layer fiber cloth improves the mechanical properties and working bandwidth of the radome. However, the mechanical strength of the silicon resin is low, and it needs to be formed under high pressure, which limits its wide application in radomes. SUMMARY

[0005] The application provides a cyanate-based composite material with high temperature resistance and low dielectric loss and application thereof to a radar high-power-density-resistant radome, which meets the requirements of antenna signal transmission power on the power resistance performance of the radome.

[0006] The high-temperature-resistant, low-dielectric-loss cyanate-based composite material of the present invention has high transmittance, low reflectivity, low thermal conversion efficiency, high heat dissipation efficiency and excellent heat resistance.

[0007] The high-temperature resistant and low-dielectric-loss cyanate-based composite material of the present invention is composed of a prepreg board, a film, and a honeycomb structure; the matrix resin of the prepreg board, film, and honeycomb structure are all modified cyanate-based resins; the modified cyanate-based resin is a blend of benzoxazine resin, bismaleimide resin, phenolic resin, polyimide resin, and cyanate resin. The density and thickness parameters of the prepreg, film, and honeycomb are as follows:

[0008] 1) Prepreg board The prepreg board is formed by curing prepreg, and the raw material composition of the prepreg includes a high thermal conductivity cyanate ester-based resin matrix and reinforcing fibers.

[0009] The high thermal conductivity cyanate matrix is ​​obtained by modifying a cyanate-based resin for prepregs with 1%~50wt% thermoplastic materials such as PES and PTFE and 1%~10wt% particles such as boron nitride and alumina.

[0010] The cyanate-based resin used in the prepreg is modified by blending benzoxazine resin, bismaleimide resin, phenolic resin, polyimide resin and cyanate ester resin. Preferably, the cyanate ester-based resin used in the prepreg is a prepolymer with a viscosity of 7000-15000 mPa·s.

[0011] The reinforcing fibers are quartz fibers, glass fibers, basalt fibers, aramid fibers, etc.

[0012] The prepreg has a glue content of 35%–45%, and the properties of the prepreg laminate composite material after curing are shown in the table below:

[0013] 2) Adhesive film The matrix used for the adhesive film is cyanate ester resin, and the cyanate ester resin used in the adhesive film is in the same system as the prepreg. The viscosity of the cyanate ester resin used in the adhesive film is 5000-10000 mPa·s, and it can be used with or without a carrier. If a carrier is used, the carrier is polyester fiber or quartz fiber with an areal density of 20 g / m³. 2 —50g / m 2 The performance parameters of the adhesive film are shown in the table below:

[0014] The aforementioned honeycomb material is prepared by impregnating aramid paper honeycomb with a cyanate-based honeycomb resin and curing it. The viscosity of the adhesive solution prepared by the cyanate-based honeycomb resin and butyl acetate or other solvents ranges from 0.35 mPa·s to 0.75 mPa·s. The aramid paper honeycomb is repeatedly impregnated with the resin and cured to obtain the honeycomb core material. The honeycomb preparation method is described in (CN117845651A). Its properties are shown in the table below.

[0015] The high-temperature-resistant, low-dielectric-loss cyanate-based composite material of the present invention is used to prepare radar-resistant, high-power-density radomes.

[0016] The radar-resistant high-power-density radome of this invention has the following specific structure: the inner and outer layers are made of cyanate ester-based resin prepreg forming a skin; a cyanate ester-based resin adhesive film is used to bond the skin to the core material; and cyanate ester-based resin modified aramid honeycomb serves as the core material. The sequence from the outside to the inside is: outer skin, adhesive film, honeycomb, adhesive film, skin. The adhesive film, honeycomb, adhesive film, and skin can be repeated as needed to form a sandwich honeycomb core structure or a multi-layer sandwich structure.

[0017] The radar-resistant high-power-density radome has a specific structure of A-layer honeycomb core structure, C-layer honeycomb core structure, or multi-layer honeycomb core structure.

[0018] Furthermore, the A-layer honeycomb sandwich structure has the following layering sequence: inner skin prepreg board, adhesive film, honeycomb, adhesive film, and outer skin prepreg board.

[0019] Furthermore, the C-layer honeycomb sandwich structure has the following layering sequence: inner skin prepreg board, film, honeycomb, film, middle layer skin prepreg board, film, honeycomb, film, and outer skin prepreg board.

[0020] Preferably, the multi-layered structure is based on the A-layer layup sequence of inner skin prepreg board, film, honeycomb, film, outer skin prepreg board, and then repeatedly lays film, honeycomb, film, and skin prepreg board to form a multi-layered honeycomb sandwich structure.

[0021] The prepreg board is made of cyanate ester resin prepreg to form the skin, the cyanate ester resin film is used to bond the skin to the core material, and the cyanate ester resin impregnated aramid paper honeycomb is used as the core material.

[0022] Compared with the prior art, the present invention has the following advantages: The high-temperature-resistant, low-dielectric-loss cyanate-based composite material of the present invention provides a radar-resistant high-power-density radome with excellent electrical properties such as high transmittance and low reflectivity. This reduces electromagnetic wave loss in the radome from the source, achieving low thermal conversion efficiency and thus reducing heat generation power. Secondly, the material has a high thermal conductivity, which improves heat dissipation efficiency. Finally, the composite material itself has high temperature resistance, ensuring that the radome can work normally under the high temperature generated by high-power irradiation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the antenna radome of the A-layer structure described in Embodiments 1-5 and Comparative Example 1 of the present invention.

[0024] Figure 2 This is a schematic diagram of the antenna radome with the C-layer structure described in Embodiment 6 of the present invention.

[0025] Figure 1 shows the prepreg board, 2 shows the adhesive film, and 3 shows the core material. Detailed Implementation

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Example 1

[0027] A high-temperature resistant, low-dielectric-loss cyanate-based composite material comprises a cyanate-based resin prepreg, a cyanate-based resin film, and cyanate-based resin impregnated modified aramid honeycomb.

[0028] The cyanate-based resin is formulated by compounding benzoxazine resin, bismaleimide resin, phenolic resin, and cyanate resin in a ratio of 20:10:5:65, which is Formula 1.

[0029] The cyanate-based prepreg includes a cyanate-based resin for prepreg and reinforcing fibers.

[0030] The reinforcing material is a quartz fiber fabric with a surface density of 107±10 g / m³. 2 .

[0031] The prepreg uses cyanate-based resin of formulation 1 as a prepolymer with a viscosity of 8000 mPa·s, a resin content of 40±5%, and a single-layer thickness of 0.15 mm. The properties of the prepreg after curing are shown in the table.

[0032] The cyanate-based resin used in the aforementioned film formulation 1 has a resin viscosity of 8000 mPa·s, a film thickness of 0.1 mm, and an areal density of 150 ± 10 g / m³. 2 The carrier is polyester fiber felt with a surface density of 25±5 g / m³. 2 .

[0033] The honeycomb material is prepared by impregnating aramid paper with cyanate-based resin and curing. The honeycomb cyanate-based resin and butyl acetate solvent are used to prepare an adhesive solution with a viscosity of 0.50 mPa·s. The aramid paper honeycomb is repeatedly impregnated with the adhesive and cured to obtain the honeycomb core material. The honeycomb preparation method is referenced in (CN117845651A), and the honeycomb density is 65±5 kg / m³. 3 The thickness is 4.5mm. Its properties are shown in the table below.

[0034] The radar-resistant high-power-density radome prepared in Example 1 has an A-layer honeycomb sandwich structure. The layering sequence is: inner skin prepreg board, adhesive film, honeycomb, adhesive film, outer skin prepreg board. The thickness of both the inner and outer skins is 0.3 mm. The thickness of a single layer of the prepreg after curing is about 0.1 mm, and three layers need to be laid. The 0.1 mm adhesive film and the 4.5 mm honeycomb are laid in sequence.

[0035] After laying out the materials, sequentially lay out the release cloth, pressure plate, breathable felt, vacuum bag film and other auxiliary materials on the product. Set up the vacuum nozzle, connect the vacuum pipeline and evacuate to -0.085MPa. Then, increase the temperature in a gradient of 130℃ / 0.5 hours and 180℃ / 1 hour to 200℃ and cure for 4 hours.

[0036] Example 2

[0037] A high-temperature resistant, low-dielectric-loss cyanate-based composite material comprises a cyanate-based resin prepreg, a cyanate-based resin film, and cyanate-based resin impregnated modified aramid honeycomb.

[0038] The cyanate-based resin is formulated as Formula 2 by compounding benzoxazine resin, bismaleimide resin, phenolic resin, and cyanate resin in a ratio of 10:16:8:66.

[0039] The cyanate-based prepreg includes a cyanate-based resin for prepreg and reinforcing fibers.

[0040] The reinforcing material is a quartz fiber fabric with a surface density of 107±10 g / m³. 2 .

[0041] The prepreg uses cyanate-based resin in formulation 2 as a prepolymer with a viscosity of 8000 mPa·s, a resin content of 40±5%, and a single-layer thickness of 0.15 mm. The properties of the cured prepreg are shown in the table below:

[0042] The cyanate-based resin used in the aforementioned adhesive film has a resin viscosity of 8000 mPa·s, a film thickness of 0.1 mm, and an areal density of 150 ± 10 g / m³. 2 The carrier is polyester fiber felt with a surface density of 25±5 g / m³. 2 .

[0043] The honeycomb material is made by impregnating aramid paper with cyanate-based resin and curing it. The viscosity of the cyanate-based resin for the honeycomb is 8000 mPa·s. A solution is prepared using the resin and butyl acetate or other solvents. The aramid paper honeycomb is then repeatedly impregnated and cured to obtain the honeycomb core material. The honeycomb preparation method is referenced in (CN117845651A), and the honeycomb density is 65±5 kg / m³. 3 The thickness is 4.5mm. Its properties are shown in the table below.

[0044] The radar-resistant high-power-density radome has an A-layer honeycomb sandwich structure. The layering sequence is: inner skin prepreg board, adhesive film, honeycomb, adhesive film, outer skin prepreg board. The thickness of both the inner and outer skins is 0.3mm. The thickness of a single layer of the prepreg after curing is about 0.1mm. Three layers need to be laid. The 0.1mm adhesive film and the 4.5mm honeycomb are laid in sequence.

[0045] After laying out the materials, sequentially lay out the release cloth, pressure plate, breathable felt, vacuum bag film and other auxiliary materials on the product. Set up the vacuum nozzle, connect the vacuum pipeline and evacuate to -0.085MPa. Then, increase the temperature in a gradient of 130℃ / 0.5 hours and 180℃ / 1 hour to 200℃ and cure for 4 hours.

[0046] Example 3

[0047] A high-temperature resistant, low-dielectric-loss cyanate-based composite material comprises a cyanate-based resin prepreg, a cyanate-based resin film, and cyanate-based resin impregnated modified aramid honeycomb.

[0048] The cyanate-based resin for the prepreg is formulated as Formula 3 by compounding benzoxazine resin, bismaleimide resin, phenolic resin, polyimide resin and cyanate resin in a ratio of 10:10:5:20:55.

[0049] The cyanate-based prepreg includes a cyanate-based resin for prepreg and reinforcing fibers.

[0050] The reinforcing material is a quartz fiber fabric with a surface density of 107±10 g / m³. 2 .

[0051] The prepreg uses cyanate-based resin of formulation 3 as a prepolymer with a viscosity of 8000 mPa·s, a resin content of 40±5%, and a single-layer thickness of 0.15 mm. The properties of the prepreg after curing are shown in the table below:

[0052] The adhesive film uses a cyanate-based resin with a viscosity of 8000 mPa·s, a film thickness of 0.1 mm, and an areal density of 150 ± 10 g / m³. 2 The carrier is polyester fiber felt with a surface density of 25±5 g / m³. 2 .

[0053] The honeycomb material is prepared by impregnating aramid paper with a cyanate-based resin and curing it. The viscosity of the cyanate-based resin for the honeycomb is 8000 mPa·s. A solution is prepared using the resin and butyl acetate or other solvents. The aramid paper honeycomb is then repeatedly impregnated with the resin and cured to obtain the honeycomb core material. The honeycomb preparation method is referenced in (CN117845651A), and the honeycomb density is 65±5 kg / m³. 3 The thickness is 4.5mm. Its properties are shown in the table below.

[0054] The radar-resistant high-power-density radome has an A-layer honeycomb sandwich structure. The layering sequence is: inner skin prepreg board, adhesive film, honeycomb, adhesive film, outer skin prepreg board. The thickness of both the inner and outer skins is 0.3mm. The thickness of a single layer of the prepreg after curing is about 0.1mm. Three layers need to be laid. The 0.1mm adhesive film and the 4.5mm honeycomb are laid in sequence.

[0055] After laying out the materials, sequentially lay out the release cloth, pressure plate, breathable felt, vacuum bag film and other auxiliary materials on the product. Set up the vacuum nozzle, connect the vacuum pipeline and evacuate to -0.085MPa. Then, increase the temperature in a gradient of 130℃ / 0.5 hours and 180℃ / 1 hour to 200℃ and cure for 4 hours.

[0056] Example 4 A high-temperature resistant, low-dielectric-loss cyanate-based composite material comprises a cyanate-based resin prepreg, a cyanate-based resin film, and cyanate-based resin impregnated modified aramid honeycomb.

[0057] The cyanate-based resin used in the prepreg is based on the above formulation 1, and the toughness of the material at high temperatures is improved by adding 10% thermoplastic polyethersulfone and 5% polytetrafluoroethylene resin respectively.

[0058] The cyanate-based prepreg includes a cyanate-based resin for prepreg and reinforcing fibers.

[0059] The reinforcing material is a quartz fiber fabric with a surface density of 107±10 g / m³.2 .

[0060] The prepreg uses a cyanate-based resin with a viscosity of 8000 mPa·s, a resin content of 40±5%, and a single-layer thickness of 0.15 mm. The properties of the cured prepreg are shown in the table below.

[0061] The cyanate-based resin used for the adhesive film is the same as the cyanate-based resin used for the prepreg, with a resin viscosity of 8000 mPa·s, an adhesive film thickness of 0.1 mm, and an areal density of 150 ± 10 g / m³. 2 The carrier is polyester fiber felt with a surface density of 25±5 g / m³. 2 .

[0062] The honeycomb material is prepared by impregnating aramid paper with cyanate-based resin according to formulation 1 and curing it. The viscosity of the cyanate-based resin for honeycomb is 8000 mPa·s. A solution is prepared using the resin and butyl acetate or other solvents. The aramid paper honeycomb is then repeatedly impregnated with the resin and cured to obtain the honeycomb core material. The honeycomb preparation method is referenced in (CN117845651A), and the honeycomb density is 65±5 kg / m³. 3 The thickness is 4.5mm. Its properties are shown in the table below.

[0063] The radar-resistant high-power-density radome has an A-layer honeycomb sandwich structure. The layering sequence is: inner skin prepreg board, adhesive film, honeycomb, adhesive film, outer skin prepreg board. The thickness of both the inner and outer skins is 0.3mm. The thickness of a single layer of the prepreg after curing is about 0.1mm. Three layers need to be laid. The 0.1mm adhesive film and the 4.5mm honeycomb are laid in sequence.

[0064] After laying out the materials, sequentially lay out the release cloth, pressure plate, breathable felt, vacuum bag film and other auxiliary materials on the product. Set up the vacuum nozzle, connect the vacuum pipeline and evacuate to -0.085MPa. Then, increase the temperature in a gradient of 130℃ / 0.5 hours and 180℃ / 1 hour to 200℃ and cure for 4 hours.

[0065] Example 5 A high-temperature resistant, low-dielectric-loss cyanate-based composite material comprises a cyanate-based resin prepreg, a cyanate-based resin film, and cyanate-based resin impregnated modified aramid honeycomb.

[0066] The cyanate-based resin for the prepreg is based on the above formulation 1, and high thermal conductivity cyanate-based resin is obtained by adding 5% boron nitride and 2.5% alumina particles.

[0067] The cyanate-based prepreg includes a cyanate-based resin for prepreg and reinforcing fibers.

[0068] The reinforcing material is a quartz fiber fabric with a surface density of 107±10 g / m³. 2 .

[0069] The prepreg uses a cyanate-based resin with a viscosity of 8000 mPa·s, a resin content of 40±5%, and a single-layer thickness of 0.15 mm. The properties of the cured prepreg are shown in the table below.

[0070] The cyanate-based resin used for the adhesive film is the same as the cyanate-based resin used for the prepreg, with a resin viscosity of 8000 mPa·s, an adhesive film thickness of 0.1 mm, and an areal density of 150 ± 10 g / m³. 2 The carrier is polyester fiber felt with a surface density of 25±5 g / m³. 2 .

[0071] The honeycomb material is prepared by impregnating aramid paper with cyanate-based resin according to formulation 1 and curing it. The viscosity of the cyanate-based resin for honeycomb is 8000 mPa·s. A solution is prepared using the resin and butyl acetate or other solvents. The aramid paper honeycomb is then repeatedly impregnated with the resin and cured to obtain the honeycomb core material. The honeycomb preparation method is referenced in (CN117845651A), and the honeycomb density is 65±5 kg / m³. 3 The thickness is 4.5mm. Its properties are shown in the table below.

[0072] The radar-resistant high-power-density radome has an A-layer honeycomb sandwich structure. The layering sequence is: inner skin prepreg board, adhesive film, honeycomb, adhesive film, outer skin prepreg board. The thickness of both the inner and outer skins is 0.3mm. The thickness of a single layer of the prepreg after curing is about 0.1mm. Three layers need to be laid. The 0.1mm adhesive film and the 4.5mm honeycomb are laid in sequence.

[0073] After laying out the materials, sequentially lay out the release cloth, pressure plate, breathable felt, vacuum bag film and other auxiliary materials on the product. Set up the vacuum nozzle, connect the vacuum pipeline and evacuate to -0.085MPa. Then, increase the temperature in a gradient of 130℃ / 0.5 hours and 180℃ / 1 hour to 200℃ and cure for 4 hours.

[0074] Example 6 The preparation of the prepreg sheets, film and core material for the inner and outer skins is the same as in Example 1. A radar-resistant high-power density radome is made using a C-layer structure, and the thicknesses of each layer are 0.4 mm, 4.5 mm, 0.1 mm, 4.5 mm and 0.4 mm, respectively.

[0075] Comparative Example 1 The matrix resin used to prepare prepregs, films, and honeycomb is epoxy resin.

[0076] The epoxy resin-based prepreg includes epoxy resin for prepreg and reinforcing fibers.

[0077] The reinforcing material is a quartz fiber fabric with a surface density of 107±10 g / m³. 2 .

[0078] The prepreg uses epoxy resin as a prepolymer with a viscosity of 6000 mPa·s, a resin content of 40±5%, and a single-layer thickness of 0.15 mm. The properties of the cured prepreg are shown in the table below.

[0079] The epoxy resin used for the adhesive film has a viscosity of 6000 mPa·s, a film thickness of 0.1 mm, and a surface density of 150 ± 10 g / m³. 2 The carrier is polyester fiber felt with a surface density of 25±5 g / m³. 2 .

[0080] The honeycomb material is formed by impregnating aramid paper honeycomb with epoxy resin and curing it. The epoxy resin used for the honeycomb has a viscosity of 6000 mPa·s. A solution is prepared by mixing the resin with butyl acetate or other solvents. The aramid paper honeycomb is then repeatedly impregnated with the resin and cured to obtain the honeycomb core material. The honeycomb preparation method is referenced in (CN117845651A), and the honeycomb density is 65±5 kg / m³. 3 The thickness is 4.5mm. Its properties are shown in the table below.

[0081] The radar-resistant high-power-density radome prepared in the comparative example has an A-layer honeycomb sandwich structure. The layup sequence is: inner skin prepreg board, adhesive film, honeycomb, adhesive film, outer skin prepreg board. The thickness of both the inner and outer skins is 0.3 mm. The thickness of a single layer of the prepreg after curing is about 0.1 mm, and three layers need to be laid. The 0.1 mm adhesive film and the 4.5 mm honeycomb are laid in sequence.

[0082] After laying out the materials, sequentially lay out the release cloth, pressure plate, breathable felt, vacuum bag film and other auxiliary materials on the product. Set up the vacuum nozzle, connect the vacuum pipeline and evacuate to -0.085MPa. Then, cure the product by increasing the temperature in a gradient of 90℃ / 0.5 hours and 120℃ / 2 hours.

[0083] Detection example The sandwich structure radomes fabricated in the above embodiments and comparative examples were tested and evaluated along with the furnace components to verify their application in high-power-density radar radomes. Transmittance and reflectivity were measured according to GJB7954-2012 "Test Method for Transmittance of Radar Transmitting Materials", with the composite material temperature at a power density of 50 W / cm². 2The temperature resistance evaluation was obtained through simulation calculations under irradiation, comparing the glass transition temperatures of each layer of the sandwich composite material with the highest simulated temperature, and referencing the mechanical strength of the composite material at high temperatures (tensile strength at 200℃ in this patent). Examples 1 to 3 are three composite materials with different dielectric and temperature resistance properties. Examples 4 and 5 are based on Example 1, with toughening and thermal conductivity modifications, respectively. Example 6 is a C-layer sandwich structure. The glass transition temperatures of the composite materials in Examples 1 to 6 are compared at a power density of 50 W / cm². 2 The temperature generated under irradiation exceeds 90℃, meeting the requirements for long-term use. The comparative example is a composite material A sandwich structure with an epoxy resin matrix, whose glass transition temperature is lower than that at a power density of 50 W / cm². 2 The temperature generated by irradiation may pose a risk of failure during use.

[0084]

[0085]

Claims

1. A high-temperature resistant, low-dielectric-loss cyanate-based composite material, comprising a prepreg board, an adhesive film, and a honeycomb structure; characterized in that, The base resins of the prepreg board, film, and honeycomb materials are all modified cyanate ester-based resins; the modified cyanate ester-based resins are modified by blending benzoxazine resin, bismaleimide resin, phenolic resin, polyimide resin and cyanate ester resin. The density and thickness parameters of the prepreg board, film, and honeycomb are as follows: 。 2. The high-temperature resistant, low-dielectric-loss cyanate-based composite material according to claim 1, characterized in that, The prepreg board is formed by curing prepreg, and the raw material composition of the prepreg includes a high thermal conductivity cyanate ester resin matrix and reinforcing fibers; The high thermal conductivity cyanate matrix is ​​obtained by adding 1-50 wt% of thermoplastic materials such as PES and PTFE and 1-10 wt% of boron nitride and aluminum oxide particles to the above modified cyanate resin. The reinforcing material is quartz fiber, glass fiber, or basalt fiber.

3. The high-temperature resistant, low-dielectric-loss cyanate-based composite material according to claim 2, characterized in that, The prepreg uses a cyanate-based resin as a prepolymer with a viscosity of 7000-15000 mPa·s.

4. The high-temperature resistant, low-dielectric-loss cyanate-based composite material according to claim 2, characterized in that, The prepreg has a glue content of 35%-45%, and the properties of the prepreg laminate composite material after curing are shown in the table below: 。 5. The high-temperature resistant, low-dielectric-loss cyanate-based composite material according to claim 1, characterized in that, The matrix used in the adhesive film is cyanate ester resin, and the cyanate ester resin used in the adhesive film is the same system as the prepreg.

6. The high-temperature resistant, low-dielectric-loss cyanate-based composite material according to claim 5, characterized in that, The cyanate-based resin used for the film has a viscosity of 5000-10000 mPa·s and an areal density of 20 g / m³. 2 -50g / m 2 It can be used with or without a carrier; if a carrier is used, the carrier can be polyester fiber or quartz fiber.

7. The high-temperature resistant, low-dielectric-loss cyanate-based composite material according to claim 5, characterized in that, The performance parameters of the adhesive film are shown in the table below: 。 8. The high-temperature resistant, low-dielectric-loss cyanate-based composite material according to claim 1, characterized in that, The honeycomb material is made by impregnating aramid paper honeycomb with honeycomb cyanate ester-based resin and curing it. The viscosity range of the adhesive solution prepared by honeycomb cyanate ester-based resin and butyl acetate or other solvents is 0.35 mPa·s-0.75 mPa·s. The honeycomb core material is obtained by impregnating and curing the aramid paper honeycomb multiple times.

9. The high-temperature resistant, low-dielectric-loss cyanate-based composite material according to claim 8, characterized in that, Cellular performance is shown in the table below: 。 10. The application of the high-temperature resistant, low-dielectric-loss cyanate-based composite material according to any one of claims 1-9, characterized in that, Used to manufacture radar-resistant high-power-density radomes; The radar-resistant high-power-density radome has a specific structure of A-layer honeycomb core structure, C-layer honeycomb core structure or multi-layer honeycomb core structure. The prepreg board is made of cyanate ester resin prepreg to form the skin, the cyanate ester resin film is used to bond the skin to the core material, and the cyanate ester resin impregnated aramid paper honeycomb is used as the core material. Furthermore, the A-layer honeycomb sandwich structure has the following layering sequence: inner skin prepreg board, film, honeycomb, film, outer skin prepreg board; Furthermore, the C-layer honeycomb sandwich structure has the following layering sequence: inner skin prepreg board, film, honeycomb, film, middle layer skin prepreg board, film, honeycomb, film, outer skin prepreg board; Furthermore, the multi-layered structure is based on the A-layer layup sequence of inner skin prepreg board, film, honeycomb, film, outer skin prepreg board, with repeated layers of film, honeycomb, film, and skin prepreg board to form a multi-layered honeycomb sandwich structure.

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