CN116031643A - Integrated light flame-retardant radome and forming method thereof - Google Patents
Integrated light flame-retardant radome and forming method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of wire cover manufacturing, in particular to the field of IPC H01Q1, and further relates to an integrated light flame-retardant radome and a forming method thereof. The preparation raw materials of the panel comprise thermoplastic resin prepreg or thermosetting resin prepreg; the thermoplastic resin prepreg includes a thermoplastic resin matrix and reinforcement fibers; the thermosetting resin prepreg includes a thermosetting resin matrix and reinforcement fibers. According to the forming method of the integrated light flame-retardant radome, the airtight test is carried out to keep airtight under the condition of 15kPa of negative pressure or 10kPa of positive pressure; the wave transmission area can realize the wave transmission rate not lower than 97 percent in the 5G frequency band, the dielectric constant not exceeding 2.7, and the dielectric loss not exceeding 0.02; the V0-level flame retardance of the integrated light flame-retardant radome can be realized; no damage occurs under the impact action at the low temperature of minus 30 ℃; the weight reduction is realized to be not lower than 15 percent.
Description
Technical Field
The invention relates to the technical field of antenna housing manufacture, in particular to the field of IPC H01Q1, and further relates to an integrated light flame-retardant antenna housing and a forming method thereof.
Background
At present, engineering plastics are commonly used for manufacturing the radome through an injection molding process, and the integral structure of the radome is obtained through one-step molding, so that the main problems are as follows: (1) When the antenna housing is large in size, the weight of the antenna housing is also large, so that the antenna housing is not beneficial to transportation and installation; (2) The one-step molding process is not beneficial to design optimization of a wave-transmitting area and improvement of the overall performance of the antenna and the communication base station; (3) The traditional halogen-containing flame retardant plastic can release a large amount of toxic gases during combustion, and has great harm. In order to solve the problems, the composite material is applied to the 5G base station radome, so that the requirements of reducing the weight of the radome and simultaneously flexibly realizing the optimization of the wave-transmitting performance of the radome and reducing the signal distortion can be met, and the optimization of the flame retardant system can prevent the release of toxic gas while improving the flame retardant performance of the radome; however, if the antenna housing is made of a composite material, the cost is high due to the high price of raw materials, long molding time of the composite material and low production efficiency, and the requirement of rapid cost reduction of communication equipment cannot be met.
Chinese patent C N110016235A discloses a flame-retardant glass fiber reinforced plastic radome profile and a preparation method thereof. According to the invention, the environment-friendly modified nano magnesium hydroxide flame retardant is adopted to prepare the flame-retardant glass fiber reinforced plastic radome profile, so that the defects of easy migration, easy moisture absorption, white spots caused by precipitation of a workpiece and the like of the inorganic flame retardant in a resin system at the present stage due to poor compatibility can be overcome, and the problem that the physical and mechanical properties of the workpiece are reduced due to the addition of the inorganic flame retardant at the present stage can be solved, and the physical and mechanical properties of the workpiece can be improved. However, the whole antenna housing prepared by the technical scheme is made of composite materials, so that the cost is high. In addition, the inclusion of metallic elements in the flame retardant has an adverse effect on the wave-transmitting performance of the radome.
Chinese patent C N217881907U discloses a protective radome structure for a 5G communication base station. This patent discloses the 5G basic station radome of application number CN201710283855.3, and the radome includes annular plate, top, straight-bar, and these structures have realized the function of drainage to do not form ponding, avoid the corrosion to inner structure. However, the antenna housing is hemispherical and integrally molded, is not suitable for the requirements of miniaturization and light weight of the 5G base station, and is difficult to specifically optimize the wave transmission performance of the antenna housing.
Disclosure of Invention
In order to solve the technical problems, the first aspect of the invention provides an integrated light flame-retardant radome, which comprises a panel and a frame; the preparation raw materials of the panel comprise thermoplastic resin prepreg or thermosetting resin prepreg;
the thermoplastic resin prepreg includes a thermoplastic resin matrix and reinforcement fibers;
the thermosetting resin prepreg includes a thermosetting resin matrix and reinforcement fibers.
In some preferred embodiments, the thermoplastic resin matrix comprises, by mass, 100 to 120 parts of thermoplastic resin, 10 to 30 parts of reinforcing agent, 2 to 10 parts of flame retardant, 2 to 5 parts of silane coupling agent, and 0.01 to 0.3 part of antioxidant.
In some preferred embodiments, the thermoplastic resin is selected from one or more combinations of PC (polycarbonate), ABS (acrylonitrile-butadiene-styrene copolymer), PP (polypropylene), PE (polyvinyl chloride), PEI (polyethylenimine), PBT (polybutylene terephthalate), PC/ABS, ASA (graft copolymer of acrylic rubber with acrylonitrile, styrene).
In some preferred embodiments, the thermoplastic resin is PC or PP.
In some preferred embodiments, the thermosetting resin matrix comprises, by mass, 100-200 parts of thermosetting resin, 10-30 parts of reinforcing agent, 10-20 parts of diluent, 5-20 parts of curing agent, 10-15 parts of flame retardant, 5-10 parts of toughening agent, 0.5-2 parts of accelerator and 5-10 parts of antioxidant.
In some preferred embodiments, the thermosetting resin is selected from one or more combinations of epoxy resins, unsaturated polyester resins, vinyl resins, polyimide resins, bismaleimide resins, cyanate resins.
In some preferred embodiments, the thermosetting resin is an epoxy resin or a vinyl resin.
In some preferred embodiments, the reinforcing agent is chopped glass fibers.
Preferably, the chopped glass fibers have a chopping length of 5 to 30mm.
Preferably, the chopped glass fibers have a chopping length of 5 to 15mm.
In some preferred embodiments, the volume fraction of the reinforcement fibers in the thermoplastic resin prepreg or thermosetting resin prepreg is 50 to 70%.
In some preferred embodiments, the reinforcement fibers are selected from one or more combinations of glass fibers, quartz fibers, aramid fibers, basalt fibers.
Preferably, the reinforcement fibers are glass fibers.
Preferably, the glass fiber is any one of high-strength glass fiber and low-dielectric glass fiber.
Preferably, the high-strength glass fiber has a tensile strength of 4000 to 5000MPa.
Preferably, the gram weight of the high-strength glass fiber is 100-200 g/m 2 。
Preferably, the low dielectric glass fiber has a dielectric constant less than 5 (10 GHZ).
Preferably, the gram weight of the low dielectric glass fiber is 50-200 g/m 2 。
In the invention, the wave transmission rate can be improved while the mechanical property of the radome is improved by introducing the reinforcement fiber, and the gram weight is especially selected to be 100-200 g/m 2 High-strength glass fibers or gram weights of 50 to 200g/m 2 The low dielectric glass fiber is selected, and the chopped glass fiber with the thickness of 3-15 mm is used as a reinforcing agent, so that the mechanical property and the wave transmittance of the prepared radome are optimal. The applicant guesses that: the mechanical property and wave-transmitting property of the composite material under certain specific conditions are related to the degree of infiltration of the resin matrix to the surface of the fiber reinforcement, the higher the degree of infiltration of the resin matrix and the fiber reinforcement is, the more smooth the load transmission is, the loss generated by the electromagnetic wave signal passing through the interface,The smaller the deviation is, the better the mechanical property and wave-transmitting property of the radome are.
In some preferred embodiments, the flame retardant is selected from one or more combinations of nitrogen based flame retardants, phosphorus based flame retardants, silicon based flame retardants, sulfonate based flame retardants.
In some preferred embodiments, the silane coupling agent is selected from any one of gamma-aminopropyl triethoxysilane, gamma-methacryloxypropyl trimethoxysilane, vinyl trimethoxysilane.
In some preferred embodiments, the antioxidant is selected from at least one of antioxidant 168, antioxidant 1010, antioxidant 1330.
In some preferred embodiments, the method of preparing the prepreg comprises the steps of:
(1) Mixing resin matrix raw materials: uniformly mixing the raw materials of the resin matrix according to the parts by mass;
(2) Resin matrix-reinforcement fiber impregnation: preheating the reinforcement fiber and closely attaching the reinforcement fiber with the release paper, coating the resin matrix mixed in the step (1) on the reinforcement fiber, and enabling the release paper, the resin matrix and the reinforcement fiber to pass through a coating roller under the action of a certain traction force so as to ensure that the color and the resin content of the mixture reach the design requirements.
(3) Shaping the prepreg: and (3) passing the mixture obtained in the step (2) through a post-treatment roller, baking and cooling, and simultaneously stretching and shaping the mixture to obtain a prepreg semi-finished product.
(4) And (3) packaging the prepreg: and (3) pasting a protective film on the prepreg semi-finished product obtained in the step (3), then rolling, and cutting after a certain length is reached to obtain the prepreg.
Preferably, the prepreg is a thermoplastic prepreg or a thermosetting prepreg.
Preferably, the resin matrix is a thermoplastic resin matrix or a thermosetting resin matrix.
Preferably, the thermoplastic resin matrix material mixing method comprises the following steps: and adding the thermoplastic resin, the reinforcing agent, the flame retardant, the silane coupling agent and the antioxidant into a double-screw extruder for extrusion according to the parts by mass.
Preferably, if the thermoplastic resin is a liquid, the step (1) is: adding thermoplastic resin, reinforcing agent, flame retardant, silane coupling agent and antioxidant into a stirrer according to the parts by mass, and uniformly stirring.
Preferably, the mixing method of the thermosetting resin matrix raw materials comprises the following steps: according to the mass parts, adding the thermosetting resin, the reinforcing agent, the diluent, the curing agent, the flame retardant, the toughening agent, the accelerator and the antioxidant into a stirrer for uniform stirring.
In some preferred embodiments, the bezel is of the same or different material as the faceplate.
The invention also provides a forming method of the integrated light flame-retardant radome, which mainly comprises the following steps:
(1) And (3) forming a panel: the panel forming process is compression molding or vacuum infusion molding;
the compression molding method comprises the following steps: paving thermoplastic resin prepreg or thermosetting resin prepreg, and forming the paved thermoplastic resin prepreg or thermosetting resin prepreg at a certain temperature and pressure;
the vacuum infusion molding method comprises the following steps: laying reinforcement fibers in a mould according to a certain size, closing the mould, filling a resin matrix into the mould, maintaining the pressure at a certain temperature, and curing and forming;
(2) Processing a panel: processing on the panel; the surface of the panel is treated, so that the antenna housing is easy to demould;
(3) And (3) forming an antenna housing: attaching the panel to the antenna housing mold; closing the mould, and forming the frame and connecting the parts; and forming the radome.
In some preferred embodiments, the panel thickness is 0.5 to 3mm.
In some preferred embodiments, the panel processing method specifically includes:
(1) According to the design requirement, processing the characteristics of holes, grooves and the like on the panel, wherein the processing error range is 0.005-0.02 mm;
(2) The panel surface is treated, including surface roughness treatment and affinity treatment.
In some preferred embodiments, the fineness of the grinding wheel used for the surface roughness treatment is 800 to 2000 mesh.
In some preferred embodiments, in order to increase the adhesion of the panel to the frame and facilitate the demolding of the radome, the panel is subjected to an affinity treatment, and a layer of release agent is coated on the surface of the panel, preferably, the release agent comprises
DM-301、DAIKIN DAIFREE GW4010、Nanokote W-202。
In some preferred embodiments, the radome is molded by injection molding.
Preferably, the tonnage of the injection molding machine is 800-2000 t, the mold temperature is 80-120 ℃, and the pressure maintaining time is 5-20 s.
In some preferred embodiments, the method of forming the integrated lightweight flame retardant radome further comprises radome processing and coating treatment.
In some preferred embodiments, the radome machining error ranges from 0.005 to 0.02mm.
In some preferred embodiments, the coating-treated coating is selected from any one of polyurethane coating, silicone resin coating, and fluororesin coating.
In some preferred embodiments, the coating thickness of the coating process is 10 to 80 μm.
The beneficial effects are that:
1. the forming method of the integrated light flame-retardant radome provided by the invention realizes the connection of the panel and the frame, does not need to carry out operations such as cementing, riveting and the like, and improves the working efficiency; the air tightness test realizes that the air tightness is kept under the condition of 15kPa of negative pressure or 10kPa of positive pressure.
2. The integrated light flame-retardant radome provided by the invention has the advantages that the wave transmission rate of the wave transmission area in a 5G frequency band is not lower than 97%, the dielectric constant is not more than 2.7, and the dielectric loss is not more than 0.02.
3. The integrated light flame-retardant radome provided by the invention can realize V0-level flame retardance of the integrated light flame-retardant radome.
4. The integrated light flame-retardant radome provided by the invention can not be damaged under the impact action at the low temperature of minus 30 ℃.
5. The integrated light flame-retardant radome provided by the invention can realize weight reduction of not less than 15%, and is more convenient for transportation of radomes and installation of communication equipment.
Drawings
Fig. 1 is a schematic diagram of an integrated light flame retardant radome structure.
Detailed Description
Example 1
As shown in fig. 1, embodiment 1 provides an integrated light flame retardant radome, comprising a panel and a frame. The preparation raw materials of the panel comprise thermoplastic resin prepreg; the thermoplastic resin prepreg includes a thermoplastic resin matrix and reinforcement fibers.
The thermoplastic resin matrix comprises, by mass, 100 parts of thermoplastic resin, 20 parts of reinforcing agent, 6 parts of flame retardant, 3 parts of silane coupling agent and 0.1 part of antioxidant.
The thermoplastic resin is PP and is purchased from China petrochemical company, inc., and the model is S700.
The reinforcing agent is chopped glass fiber, the length of the chopped glass fiber is 6+/-1 mm, and the reinforcing agent is purchased from Chongqing International composite material Co., ltd.
The volume fraction of the reinforcement fibers in the thermoplastic resin prepreg was 60%.
The reinforcement fibers are high strength glass fibers.
The gram weight of the high-strength glass fiber is 140+/-5 g/m 2 Chongqing International composite Material Co., ltd.
The flame retardant is a combination of a phosphorus-nitrogen flame retardant and a silicon flame retardant, the mass ratio of the phosphorus-nitrogen flame retardant to the silicon flame retardant is 1:1, the phosphorus-nitrogen flame retardant is Amgard PA1, the silicon flame retardant is FR-3000, and the flame retardant is purchased from Dongguan city source flame retardant material Co.
The silane coupling agent is gamma-aminopropyl triethoxysilane, and is purchased from Nanjing LongTian-Gao chemical industry Co.
The antioxidant is antioxidant 168, and is purchased from Tianjin An Long New material Co.
The preparation method of the thermoplastic resin prepreg comprises the following steps:
(1) Mixing resin matrix raw materials: adding thermoplastic resin, reinforcing agent, flame retardant, silane coupling agent and antioxidant into a double-screw extruder for extrusion according to the parts by mass;
(2) Resin matrix-reinforcement fiber impregnation: preheating the reinforcement fiber and closely attaching the reinforcement fiber with the release paper, coating the resin matrix mixed in the step (1) on the reinforcement fiber, and enabling the release paper, the resin matrix and the reinforcement fiber to pass through a coating roller under the action of a certain traction force to ensure that the color and the resin content of the mixture meet the design requirements;
(3) Shaping the prepreg: the mixture obtained in the step (2) is subjected to post-treatment roller, baking and cooling, and simultaneously the mixture is stretched and shaped to obtain a thermoplastic resin prepreg semi-finished product;
(4) And (3) packaging the prepreg: and (3) attaching a protective film to the thermoplastic resin prepreg semi-finished product obtained in the step (3), then rolling, and cutting after a certain length is reached to obtain the thermoplastic resin prepreg.
In the step (1), the temperature of a first region of the twin-screw extruder is 200+/-2 ℃, the temperature of a second region of the twin-screw extruder is 210+/-2 ℃, the temperature of a third region of the twin-screw extruder is 220+/-2 ℃, the temperature of a fourth region of the twin-screw extruder is 230+/-2 ℃, and the temperature of a fifth region of the twin-screw extruder is 240+/-2 ℃.
The frame material is modified PP, the mass fraction of chopped glass fibers in the modified PP is 20%, and the frame material is purchased from southern Asia plastic industry (Huizhou) limited company and has the mark of 3210G4.
A forming method of an integrated light flame-retardant radome mainly comprises the following steps:
(1) And (3) forming a panel: and (3) adopting a compression molding process to laminate the thermoplastic resin prepreg, wherein the compression molding temperature in the first stage is 100+/-5 ℃, the pressure is 0.4MPa, the pressure is maintained for 10min, the compression molding temperature in the second stage is 120+/-5 ℃, the pressure is 1MPa, the pressure is maintained for 30min, and the panel finished product is obtained after die opening and removal and trimming and cutting.
(2) Processing a panel: processing on the panel; the surface of the panel is treated, so that the antenna housing is easy to demould;
(3) And (3) forming an antenna housing: attaching the panel to the antenna housing mold; closing the mould, and forming the frame and connecting the parts; and forming the radome.
The panel thickness was 2.72 + -0.02 mm.
The panel processing method specifically comprises the following steps:
(1) According to the design requirement, processing the characteristics of holes, grooves and the like on the panel, wherein the processing error range is 0.01mm;
(2) The panel surface is treated, including surface roughness treatment and mold affinity treatment.
The fineness of the grinding wheel used for the surface roughness treatment is 1000 meshes.
The affinity treatment is to coat a layer of release agent on the surface of the panel; the release agent is
DM-301。
The antenna housing is formed by injection molding.
The tonnage of the injection molding machine is 1500t, the temperature of the mold is 100+/-5 ℃, and the pressure maintaining time is 10s.
The forming method of the integrated light flame-retardant radome further comprises radome processing and coating treatment.
The machining error range of the radome is 0.01mm.
The coating processed is organic silicon resin coating HS-9004 purchased from Dongguan chemical industry Co., ltd.
The coating thickness of the coating treatment is 30+/-2 mu m.
Example 2
Example 2 provides an integrated light flame-retardant radome, and the specific implementation mode of the integrated light flame-retardant radome is the same as example 1, wherein the thermoplastic resin substrate is characterized by comprising, by mass, 120 parts of thermoplastic resin, 15 parts of reinforcing agent, 6 parts of flame retardant, 5 parts of silane coupling agent and 0.5 part of antioxidant.
The thermoplastic resin is modified PC, and is purchased from Guangdong Jinfa technology Co., ltd, and the model is JH830T.
The reinforcement fiber is high-strength glass fiber, and the gram weight is 125+/-5 g/m 2 The International composite Material Co., ltd.
The flame retardant is a silicon flame retardant FR-3000, and is purchased from Dongguan city source flame retardant material.
And (3) forming a panel: and (3) adopting a compression molding process to laminate the thermoplastic resin prepreg, wherein the temperature of the compression molding in the first stage is 200+/-5 ℃, the pressure is 0.5MPa, the pressure is maintained for 10min, the temperature of the compression molding in the second stage is 240+/-5 ℃, the pressure is 1MPa, the pressure is maintained for 30min, and the panel finished product is obtained after die opening and removal, trimming and cutting.
The coating for the panel coating treatment is polyurethane coating and is purchased from Zhejiang Mulberry technology Co., ltd, and the model is 3040.
The frame material is modified PC, the content of chopped glass fiber is 0, and the frame material is purchased from Guangzhou Jinfa technology and technology Co., ltd, and the model is JH830T.
Example 3
Embodiment 3 provides a lightweight flame retardant radome, comprising a panel and a frame; the preparation raw materials of the panel comprise thermosetting resin prepreg; the thermosetting resin prepreg includes a thermosetting resin matrix and reinforcement fibers.
The thermosetting resin matrix comprises, by mass, 150 parts of thermosetting resin, 15 parts of reinforcing agent, 10 parts of diluent, 8 parts of curing agent, 10 parts of toughening agent, 10 parts of flame retardant, 0.5 part of accelerator and 10 parts of antioxidant.
The thermosetting resin is epoxy resin 618, purchased from Nantong star synthetic materials limited company.
The reinforcing agent is chopped glass fiber, the length of the chopped glass fiber is 6+/-1 mm, and the reinforcing agent is purchased from Chongqing International composite material Co., ltd.
The volume fraction of the reinforcement fibers in the thermosetting resin prepreg was 60%.
The reinforcement fibers are high strength glass fibers.
The gram weight of the high-strength glass fiber is 140+/-10 g/cm 3 The International composite Material Co., ltd.
The diluent is LS-622 purchased from Hubei green home materials technologies Inc.
The curing agent is CUREZOL 2MZ-A, and is purchased from Jining Malus spectabilis chemical industry Co.
The toughening agent is SZD-410, and is purchased from Shanghai Sanwangding New Material Co.Ltd.
The flame retardant is a silicon flame retardant FR-3000, purchased from Dongguan city source flame retardant material Co.
The accelerator is DMP-30, and is purchased from Jiangsu cloud chemical new material Co.
The antioxidant is antioxidant 168, purchased from Tianjin An Long New Material Co., ltd.
The preparation method of the thermosetting resin prepreg comprises the following steps:
(1) Mixing resin matrix raw materials: adding thermosetting resin, a reinforcing agent, a diluting agent, a curing agent, a flame retardant, a toughening agent, an accelerator and an antioxidant into a stirrer according to parts by mass, and uniformly stirring;
(2) Resin matrix-reinforcement fiber impregnation: preheating the reinforcement fiber and closely attaching the reinforcement fiber with the release paper, coating the resin matrix mixed in the step (1) on the reinforcement fiber, and enabling the release paper, the resin matrix and the reinforcement fiber to pass through a coating roller under the action of a certain traction force to ensure that the color and the resin content of the mixture meet the design requirements;
(3) Shaping the prepreg: the mixture obtained in the step (2) is subjected to post-treatment roller, baking and cooling, and simultaneously the mixture is stretched and shaped to obtain a thermoplastic resin prepreg semi-finished product;
(4) And (3) packaging the prepreg: and (3) pasting a protective film on the prepreg semi-finished product obtained in the step (3), then rolling, and cutting after reaching a certain length to obtain the thermoplastic resin prepreg or the thermosetting resin prepreg.
The stirring speed of the stirrer in the step (1) is 50% of the maximum speed of the stirrer, the mixing temperature is 25+/-2 ℃, and the stirring time is 1h; the temperatures of the baking section and the cooling section are 60+/-2 ℃ and 15+/-2 ℃ respectively.
The frame material is the same as that of example 1.
A forming method of an integrated light flame-retardant radome mainly comprises the following steps:
(1) And (3) forming a panel: laying reinforcement fibers in a mould according to a certain size by adopting a vacuum infusion process, closing the mould, and then infusing a resin matrix into the mould; the temperature of resin pouring is 60+/-2 ℃, the pouring pressure is 0.2MPa, and after the mold filling is finished, the pressure is maintained at 100+/-2 ℃, the pressure is 0.5MPa, and the pressure is maintained for 30min; and opening the die, taking out, trimming and cutting to obtain a panel finished product.
(2) Processing a panel: processing on the panel; the surface of the panel is treated, so that the antenna housing is easy to be demolded.
(3) And (3) forming an antenna housing: attaching the panel to the antenna housing mold; closing the mould, and forming the frame and connecting the parts; and forming the radome.
The panel thickness was 2.72 + -0.02 mm.
The panel processing method specifically comprises the following steps:
(1) According to the design requirement, processing the characteristics of holes, grooves and the like on the panel, wherein the processing error range is 0.01mm;
(2) The panel surface is treated, including surface roughness treatment and mold affinity treatment.
The fineness of the grinding wheel used for surface roughness treatment is 1000 meshes.
The affinity treatment is to coat a layer of release agent on the surface of the panel; the release agent is DAIKIN DAIFREE GW4010.
The antenna housing is formed by injection molding.
The tonnage of the injection molding machine is 1500t, the temperature of the mold is 100+/-5 ℃, and the pressure maintaining time is 10s.
The forming method of the integrated light flame-retardant radome further comprises radome processing and coating treatment.
The machining error range of the radome is 0.01mm.
The coating processed paint is a fluororesin paint, and is purchased from Hunan Angwei paint Limited liability company, and the model is FS-2000.
The coating thickness of the coating treatment is 30+/-2 mu m.
Example 4
Example 4 provides an integrated light flame-retardant radome, and the specific implementation manner of the integrated light flame-retardant radome is the same as that of example 3, wherein the thermosetting resin matrix comprises, by mass, 150 parts of thermosetting resin, 15 parts of reinforcing agent, 10 parts of diluent, 10 parts of curing agent, 10 parts of toughening agent, 10 parts of flame retardant, 1 part of accelerator and 5 parts of antioxidant.
The thermosetting resin is vinyl resin, and the model is Indonesia Derakane 8084.
The toughening agent is S-2030, and is purchased from Mitsubishi chemical corporation of Japan.
The reinforcement fiber is a low dielectric glass fiber having a gram weight of 10g/m 2 Purchased from Chongqing New Material Co., ltd., model LD100.
The low dielectric glass fiber has a dielectric constant of 4.3 (10 GHZ).
The panel forming method comprises the following steps: laying reinforcement fibers in a mould according to a certain size by adopting a vacuum infusion process, closing the mould, and then infusing a resin matrix into the mould; the temperature of resin pouring is 50+/-2 ℃, the pouring pressure is 0.4MPa, and after the mold filling is finished, the pressure is maintained at 80+/-2 ℃, the pressure is 0.5MPa, and the pressure is maintained for 30min; and cutting into designed dimensions after die sinking.
The thickness of the panel is 0.50+/-0.03 mm.
Example 5
Example 5 provides an integrated lightweight flame retardant radome, the specific embodiment of which is the same as example 2, except that the thickness of the panel is 0.50±0.03mm.
The flame retardant is a silicon flame retardant, and the silicon flame retardant is FR-3000 purchased from Dongguan city source flame retardant material Co.
The frame material is modified PC/ABS, the mass fraction of chopped glass fiber in the modified PC/ABS is 20%, and the frame material is purchased from Guangzhou Jinfa technology and technology Co Ltd, and the model is JH 710G 20 PC.
Comparative example 1
Comparative example 1 provides an integrated lightweight flame retardant radome, the specific embodiment of which is the same as example 2, except that chopped glass fibers are replaced with medium alkali glass fibers, the chopped length is 24mm, purchased from Shaanxi Huate New Material Co., ltd.
Comparative example 2
Comparative example 2 provides an integrated lightweight flame retardant radome, specific embodiments of which are the same as example 2, except that the high strength glass fiber has a grammage of 240g/m 2 Purchased from Chongqing New Material Co., ltd., model SW240.
Comparative example 3
Comparative example 3 is a 5G radome from new fujida plastic section limited, the raw material is PC, and the molding mode is injection molding. The dimensions are substantially the same as in examples 1-5 and comparative examples 1, 2.
Performance test: the integrated light flame-retardant radomes prepared in examples 1 to 5 and comparative examples 1 to 2 were subjected to the following tests:
1. weight reduction ratio: the quality of examples 1-5, comparative example 1, comparative example 2 were compared with comparative example 3, respectively.
2. And (3) air tightness test: the numerical value represents the difference between the internal pressure and the external pressure, the negative sign represents that the internal air pressure of the antenna housing is smaller than the external air pressure during the test, and the positive sign represents that the internal air pressure of the antenna housing is larger than the external air pressure during the test.
3. Flame retardant rating: reference is made to the GB4609-84 standard.
4. Wave transmittance: the test was performed using the free space method.
5. Dielectric constant, dielectric loss: the test was performed using the transmission line method.
6. Low temperature impact test: placing the sample in an environment of minus 30 ℃, then impacting the surface of the sample to be tested by using a falling ball, and observing the appearance of the impacted sample surface; no rupture or deformation occurred and the passage was noted.
Table 1:
Claims (10)
1. an integrated light flame-retardant radome is characterized by comprising a panel and a frame; the preparation raw materials of the panel comprise thermoplastic resin prepreg or thermosetting resin prepreg;
the thermoplastic resin prepreg includes a thermoplastic resin matrix and reinforcement fibers;
the thermosetting resin prepreg includes a thermosetting resin matrix and reinforcement fibers.
2. The integrated light flame-retardant radome of claim 1, wherein the thermoplastic resin matrix comprises, by mass, 100-120 parts of thermoplastic resin, 10-30 parts of reinforcing agent, 2-10 parts of flame retardant, 2-5 parts of silane coupling agent and 0.01-0.3 part of antioxidant.
3. The integrated lightweight flame retardant radome of claim 2, wherein the thermoplastic resin is selected from one or more combinations of PC, ABS, PP, PE, PEI, PBT, PC/ABS, ASA.
4. The integrated light flame-retardant radome of claim 3, wherein the thermosetting resin matrix comprises, by mass, 100-200 parts of thermosetting resin, 10-30 parts of reinforcing agent, 10-20 parts of diluent, 5-20 parts of curing agent, 10-15 parts of flame retardant, 5-10 parts of toughening agent, 0.5-2 parts of accelerator and 5-10 parts of antioxidant.
5. The integrated lightweight flame retardant radome of claim 4, wherein said thermosetting resin is selected from one or more combinations of epoxy resin, unsaturated polyester resin, vinyl resin, polyimide resin, bismaleimide resin, cyanate resin.
6. The integrated lightweight flame retardant radome of claim 1, wherein the volume fraction of the reinforcement fibers in the thermoplastic resin prepreg or the thermosetting resin prepreg is 50-70%; the reinforcement fiber is selected from one or more of glass fiber, quartz fiber, aramid fiber and basalt fiber.
7. The integrated lightweight flame retardant radome of claim 6, wherein the reinforcement fiber is selected from any one or a combination of a plurality of high strength glass fibers and low dielectric glass fibers.
8. The integrated lightweight flame retardant radome of claim 4, wherein said reinforcing agent is chopped glass fiber; the length of the chopped glass fiber is 5-30 mm.
9. The integrated light flame-retardant radome of claim 4, wherein the flame retardant is selected from one or more of nitrogen flame retardant, phosphorus flame retardant, silicon flame retardant and sulfonate flame retardant.
10. A method of forming an integrated lightweight flame retardant radome of any one of claims 1 to 9, which essentially comprises the steps of:
(1) And (3) forming a panel: the panel forming process is compression molding or vacuum infusion molding;
the compression molding method comprises the following steps: paving thermoplastic resin prepreg or thermosetting resin prepreg, and forming the paved thermoplastic resin prepreg or thermosetting resin prepreg at a certain temperature and pressure;
the vacuum infusion molding method comprises the following steps: laying reinforcement fibers in a mould according to a certain size, closing the mould, filling a resin matrix into the mould, maintaining the pressure at a certain temperature, and curing and forming;
(2) Processing a panel: processing on the panel; the surface of the panel is treated, so that the antenna housing is easy to demould;
(3) And (3) forming an antenna housing: attaching the panel to the antenna housing mold; closing the mould, and forming the frame and connecting the parts; and forming the radome.
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| CN202310100293.XA CN116031643A (en) | 2023-02-06 | 2023-02-06 | Integrated light flame-retardant radome and forming method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116715878A (en) * | 2023-05-30 | 2023-09-08 | 中北大学 | Efficient preparation method of high-temperature-resistant wave-transparent micro-nano multi-scale quartz fiber cloth reinforced thermoplastic composite material |
| CN118006124A (en) * | 2024-04-09 | 2024-05-10 | 北京玻钢院复合材料有限公司 | Prepreg for preparing composite antenna housing, composite antenna housing and preparation method thereof |
-
2023
- 2023-02-06 CN CN202310100293.XA patent/CN116031643A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116715878A (en) * | 2023-05-30 | 2023-09-08 | 中北大学 | Efficient preparation method of high-temperature-resistant wave-transparent micro-nano multi-scale quartz fiber cloth reinforced thermoplastic composite material |
| CN116715878B (en) * | 2023-05-30 | 2024-05-31 | 中北大学 | Efficient preparation method of high-temperature-resistant wave-transparent micro-nano multi-scale quartz fiber cloth reinforced thermoplastic composite material |
| CN118006124A (en) * | 2024-04-09 | 2024-05-10 | 北京玻钢院复合材料有限公司 | Prepreg for preparing composite antenna housing, composite antenna housing and preparation method thereof |
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