CN110539539A - wave-transparent material for millimeter wave antenna housing and forming method thereof - Google Patents

wave-transparent material for millimeter wave antenna housing and forming method thereof Download PDF

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Publication number
CN110539539A
CN110539539A CN201910712856.4A CN201910712856A CN110539539A CN 110539539 A CN110539539 A CN 110539539A CN 201910712856 A CN201910712856 A CN 201910712856A CN 110539539 A CN110539539 A CN 110539539A
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wave
fiber
polyether sulfone
millimeter wave
radome
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CN201910712856.4A
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CN110539539B (en
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袁角亮
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Shanghai Alaid Industrial Ltd By Share Ltd
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Shanghai Alaid Industrial Ltd By Share Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/58—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/286—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polysulphones; polysulfides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H01Q1/422—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material
    • H01Q1/424—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material comprising a layer of expanded material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/58—Measuring, controlling or regulating
    • B29C2043/5816—Measuring, controlling or regulating temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3456—Antennas, e.g. radomes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B32B2262/0269—Aromatic polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/08—Closed cell foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B32B2307/3065—Flame resistant or retardant, fire resistant or retardant

Abstract

the invention belongs to the technical field of communication antenna housing material manufacturing, and particularly relates to a wave-transmitting material for a millimeter wave antenna housing and a forming method thereof. The polyether sulfone resin material is adopted as a skin layer, the polyether sulfone foam material is adopted as a core layer, the skin layer and the core layer are made of the same material and are both thermoplastic materials, and the processing and the forming are easy; the polyether sulfone material has excellent flame retardant property, and the flame retardant grade of the polyether sulfone material can reach the UL94-V0 grade; the problem that when a thermosetting material or a conventional thermoplastic material is used as a wave-transmitting material in the prior art, the dielectric property of the material is seriously influenced by adding a flame retardant for improving the flame retardant property of the material, so that the wave-transmitting rate of the material is reduced is solved; the scheme can still keep the excellent wave-transmitting performance of the material on the premise of meeting the flame-retardant requirement.

Description

Wave-transparent material for millimeter wave antenna housing and forming method thereof
Technical Field
The invention belongs to the technical field of communication antenna housing material manufacturing, and particularly relates to a wave-transmitting material for a millimeter wave antenna housing and a forming method thereof.
Background
In a 5G millimeter wave communication base station, because the millimeter wave wavelength is short, the influence of the material type of the antenna housing on the antenna signal is large. Therefore, the material structure of the millimeter wave antenna housing is mostly a sandwich structure composite material, such as a foam sandwich structure composite material or a honeycomb sandwich structure composite material.
the skin layer of the traditional foam sandwich structure composite material radome is generally made of fiber reinforced thermosetting resin materials, and the core layer is generally made of thermosetting rigid foam, such as PMI foam. The problem that the forming process is complex, the production efficiency is low, the manufacturing cost is high and the like exists when the skin layer is made of the thermosetting resin material. The core layer is made of thermosetting foam materials and is suitable for a flat-plate radome with a simple structure, and for radomes with complex shapes, the core layer can be only formed by splicing thermosetting foam into a whole or processing the thermosetting foam into a required shape by using a whole foam machine; the splicing mode has the problems of complex processing and easy occurrence of overlarge and uneven splicing seams, and influences the wave-transmitting performance of the radome; and the machining mode wastes a large amount of raw materials.
the thermoplastic resin material has the characteristics of easiness in processing and forming, high production efficiency, low production cost and the like, and the thermoplastic material is adopted to manufacture the sandwich structure composite material radome, so that the production efficiency of products can be greatly improved, the production cost of the products is reduced, and the requirements of mass and low-cost production of civil 5G millimeter wave radomes are met.
The search of the prior art finds that patent CN103660410 provides a wave-transparent core material for an antenna housing, wherein the skin of the core material is made of fiber-reinforced thermoplastic composite material, and the core layer is made of foamed polyurethane, phenolic resin or epoxy resin. In the method, the thermoplastic resin of the skin material is polyolefin, thermoplastic polyester and polyamide, wherein the polyolefin material has poor weather resistance and flame retardance, and although the weather resistance and the flame retardance can be improved after modification, the brittleness is higher, and the dielectric constant and the loss of the material are increased; the thermoplastic polyester material has low flame retardance and high dielectric constant and loss of the material; the dielectric constant and the loss of the polyamide material are high, the water absorption rate is high, and the flame retardance is low; other thermoplastic materials such as PPS, PPO and the like have high brittleness or high cost, and are not suitable for outdoor radome products. In addition, the core layer foam material in the method is still thermosetting foam, and the production efficiency is low.
disclosure of Invention
the invention aims to provide a wave-transmitting material for a millimeter wave antenna housing and a forming method thereof, and aims to solve the problems in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
A wave-transmitting material for a millimeter wave antenna housing is of a sandwich structure and comprises an upper skin, a core layer and a lower skin.
the upper skin and the lower skin are respectively bonded with the core layer through a bonding agent;
the upper skin or the lower skin layer is made of a fiber reinforced polyether sulfone resin composite material;
the core layer is made of a closed-cell micro-foaming polyether sulfone foam material, and the material density is preferably 30kg/m 3-110 kg/m 3; the dielectric constant of the material is preferably 1.05-1.15, and the dielectric loss is preferably 0.0009-0.003.
Further, the fiber is one or more of glass fiber, quartz fiber and Kevlar fiber.
Furthermore, the fiber form is not particularly required, and can be short fiber, long fiber, continuous fiber woven cloth and fiber felt.
Furthermore, the mass percentage of the fiber to the polyether sulfone resin is 20: 80-70: 30.
Further, the binder is one or more of epoxy resin binder, acrylic resin binder and polyurethane resin binder.
Furthermore, the thickness of the upper skin is 0.1-2 mm.
further, the thickness of the lower skin is 0.1-2 mm.
furthermore, the thickness of the bonding layer is 0.05-0.2 mm.
Furthermore, the thickness of the core layer is 1-3 mm.
According to the scheme, the polyether sulfone resin material is used as a skin layer, the polyether sulfone foam material is used as a core layer, the skin layer and the core layer are made of the same material and are both thermoplastic materials, and the processing and molding are easy; the polyether sulfone material has excellent flame retardant property, and the flame retardant grade of the polyether sulfone material can reach the UL94-V0 grade; the problem that when a thermosetting material or a conventional thermoplastic material is used as a wave-transmitting material in the prior art, the dielectric property of the material is seriously influenced by adding a flame retardant for improving the flame retardant property of the material, so that the wave-transmitting rate of the material is reduced is solved; the scheme can still keep the excellent wave-transmitting performance of the material on the premise of meeting the flame-retardant requirement.
The invention also provides a method for molding the wave-transparent material for the millimeter wave antenna housing, which is realized by the following technical scheme:
sequentially paving a polyether sulfone film, continuous fiber woven cloth or fiber felt and a polyether sulfone film in a hot press die, and carrying out hot pressing at the temperature of 340-390 ℃ to obtain a fiber reinforced polyether sulfone resin composite material serving as an upper skin layer and a lower skin layer;
Or adding the polyether sulfone resin and short fibers or long fibers or continuous fibers into a sheet extruder, and performing melt extrusion on the sheet at the temperature of 300-390 ℃ to obtain a fiber-reinforced polyether sulfone resin composite material serving as an upper skin layer and a lower skin layer;
or adding the polyether sulfone resin into a casting machine, melting and casting the resin to form a film within the temperature range of 340-390 ℃, introducing the continuous fiber or the continuous fiber woven fabric or the fiber felt into a die head of the casting machine, infiltrating the continuous fiber or the continuous fiber woven fabric or the fiber felt with the molten polyether sulfone resin extruded by the die head, rolling and cooling to obtain the fiber reinforced polyether sulfone resin composite material as an upper skin layer and a lower skin layer;
Step (2), sequentially paving a lower skin, a binder, core layer foam, the binder and an upper skin in a die, and preheating to 200-240 ℃;
And (3) carrying out hot pressing or vacuum forming at the temperature of 200-240 ℃, maintaining the pressure for 10-120 s, and demolding to obtain the wave-transmitting material for the radome.
The polyether sulfone film is formed by forming polyether sulfone resin into a film.
The closed-cell micro-foaming material is the existing material and is commercially available.
The wave-transmitting material system is a thermoplastic material, can be processed at the same processing temperature and in the same processing mode, simplifies the production and processing procedures, can greatly improve the production efficiency of products, reduces the manufacturing cost of the products, and meets the requirement of civil large-batch product production; particularly, for radome products with complex shapes and structures, the material can be directly integrally formed in one step, and a process that a common thermosetting material-containing system needs multi-step forming is omitted.
Compared with the prior art, the invention has the beneficial effects that:
According to the scheme, the thermoplastic polyether sulfone resin is used as the skin layer, the thermoplastic polyether sulfone foam is used as the core layer to manufacture the wave-transmitting material for the antenna housing, a traditional thermosetting material-containing system is replaced, the wave-transmitting performance of the material is excellent, the production and processing procedures of the antenna housing product can be greatly simplified, the production efficiency is improved, and the method is suitable for large-batch automatic production, so that the preparation cost of the product is greatly reduced, and the production requirements of the civil 5G antenna housing on low cost and large batch production in the future are met; and the material system can be recycled and is environment-friendly.
Drawings
fig. 1 is a schematic cross-sectional view of a wave-transmitting material for a radome of the present invention.
Wherein: 1-upper skin, 2-core layer, 3-lower skin, 4-first binder and 5-second binder.
Detailed description of the preferred embodiments
The present invention is described in detail below with reference to specific examples, which are provided to assist those skilled in the art in further understanding the present invention, but are not intended to limit the present invention in any way.
Example 1
A wave-transmitting material for a millimeter wave antenna housing comprises an upper skin 1, a core layer 2 and a lower skin 3, wherein the upper skin and the lower skin are respectively bonded with the core layer through a first bonding agent 4 and a second bonding agent 5. The preparation method comprises the following steps:
Sequentially paving a polyether sulfone film, continuous glass fiber woven cloth and a polyether sulfone film in a hot press mold, controlling the mass percentage of the fibers to the polyether sulfone resin to be 20:80, and carrying out hot pressing at the temperature of 340-390 ℃ to obtain a fiber reinforced polyether sulfone resin composite material with the thickness of 0.1mm as an upper skin layer and a lower skin layer;
Step (2), sequentially paving a lower skin, an acrylic resin binder, a core layer with the thickness of 3mm, the acrylic resin binder and an upper skin in a die, and preheating to 200-240 ℃; wherein the thickness of the binder is 0.05mm, and the core layer is a polyether sulfone closed-cell micro-foaming material with the density of 30kg/m 3;
And (3) hot-pressing and forming at the temperature of 200-240 ℃, maintaining the pressure for 10s, and demolding to obtain the wave-transmitting material for the radome.
Example 2
A wave-transmitting material for a millimeter wave antenna housing comprises an upper skin 1, a core layer 2 and a lower skin 3, wherein the upper skin and the lower skin are respectively bonded with the core layer through a first bonding agent 4 and a second bonding agent 5. The preparation method comprises the following steps:
adding polyether sulfone resin and continuous quartz fibers into a sheet extruder, and performing melt extrusion on a sheet at the temperature of 300-390 ℃, wherein the mass percentage of the fibers to the polyether sulfone resin is controlled to be 70:30, so as to obtain a fiber-reinforced polyether sulfone resin composite material with the thickness of 2mm, wherein the fiber-reinforced polyether sulfone resin composite material is used as an upper skin layer and a lower skin layer;
Step (2), sequentially paving a lower skin, a polyurethane resin binder, a core layer with the thickness of 2mm, the polyurethane resin binder and an upper skin in a mold, and preheating to 200-240 ℃; wherein the thickness of the binder is 0.2mm, and the core layer is a polyether sulfone closed-cell micro-foaming material with the density of 40kg/m 3;
and (3) hot-pressing and forming at the temperature of 200-240 ℃, maintaining the pressure for 120s, and demolding to obtain the wave-transmitting material for the radome.
example 3
A wave-transmitting material for a millimeter wave antenna housing comprises an upper skin 1, a core layer 2 and a lower skin 3, wherein the upper skin and the lower skin are respectively bonded with the core layer through a first bonding agent 4 and a second bonding agent 5. The preparation method comprises the following steps:
Adding polyether sulfone resin into a casting machine, carrying out melt casting on the resin at the temperature of 340-390 ℃ to form a film, introducing an aramid fiber felt into a casting machine die head, infiltrating the aramid fiber felt with the molten polyether sulfone resin extruded by the die head, rolling, cooling, and controlling the mass percentage of fibers and the polyether sulfone resin to be 60:40 to obtain a fiber reinforced polyether sulfone resin composite material with the thickness of 0.3mm as an upper skin layer and a lower skin layer;
Step (2), sequentially paving a lower skin, an epoxy resin binder, a core layer with the thickness of 1mm, a polyurethane resin binder and an upper skin in a mold, and preheating to 200-240 ℃; wherein the thickness of the binder is 0.1mm, and the core layer is a polyether sulfone closed-cell micro-foaming material with the density of 110kg/m 3;
And (3) performing plastic absorption molding at the temperature of 200-240 ℃, maintaining the pressure for 60s, and demolding to obtain the wave-transmitting material for the radome.
Example 4
A wave-transmitting material for a millimeter wave antenna housing comprises an upper skin 1, a core layer 2 and a lower skin 3, wherein the upper skin and the lower skin are respectively bonded with the core layer through a first bonding agent 4 and a second bonding agent 5. The preparation method comprises the following steps:
Adding polyether sulfone resin and short glass fibers into a sheet extruder, and performing melt extrusion on a sheet at the temperature of 300-390 ℃, wherein the mass percentage of the fibers to the polyether sulfone resin is controlled to be 50:50, so as to obtain a fiber reinforced polyether sulfone resin composite material with the thickness of 0.5mm, wherein the composite material is used as an upper skin layer and a lower skin layer;
Step (2), sequentially paving a lower skin, a polyurethane resin binder, a core layer with the thickness of 2.5mm, the polyurethane resin binder and an upper skin in a mold, and preheating to 200-240 ℃; wherein the thickness of the binder is 0.1mm, and the core layer is a polyether sulfone closed-cell micro-foaming material with the density of 90kg/m 3;
And (3) hot-pressing and forming at the temperature of 200-240 ℃, maintaining the pressure for 30s, and demolding to obtain the wave-transmitting material for the radome.
Example 5
a wave-transmitting material for a millimeter wave antenna housing comprises an upper skin 1, a core layer 2 and a lower skin 3, wherein the upper skin and the lower skin are respectively bonded with the core layer through a first bonding agent 4 and a second bonding agent 5. The preparation method comprises the following steps:
adding polyether sulfone resin and feldspar quartz fibers into a sheet extruder, melting and extruding a sheet at the temperature of 300-390 ℃, and controlling the mass percentage of the fibers to be 67:33 to obtain a fiber reinforced polyether sulfone resin composite material with the thickness of 0.8mm as an upper skin layer and a lower skin layer;
step (2), sequentially paving a lower skin, an epoxy resin binder, a core layer with the thickness of 2.5mm, the epoxy resin binder and an upper skin in a die, and preheating to 200-240 ℃; wherein the thickness of the binder is 0.2mm, and the core layer is polyether sulfone closed-cell micro-foaming material with the density of 50kg/m 3;
And (3) hot-pressing and forming at the temperature of 200-240 ℃, maintaining the pressure for 60s, and demolding to obtain the wave-transmitting material for the radome.
The wave-transmitting materials obtained in examples 1 to 5 were subjected to wave-transmitting rate tests, and the test results are shown in table 1 below:
Table 1: wave transmittance test results
as can be seen from the table 1, the wave-transparent material prepared by the scheme has excellent wave-transparent performance in a millimeter wave range, and can meet the use requirement of the antenna housing.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A wave-transparent material for a millimeter wave antenna housing is characterized in that the structure of the wave-transparent material is a sandwich structure and consists of an upper skin, a core layer and a lower skin;
the upper skin and the lower skin are respectively bonded with the core layer through a bonding agent;
the upper skin or the lower skin layer is made of a fiber reinforced polyether sulfone resin composite material;
The core layer is made of a closed-cell micro-foaming polyether sulfone foam material, and the density of the material is 30kg/m 3-110 kg/m 3; the dielectric constant of the material is 1.05-1.15, and the dielectric loss is 0.0009-0.003.
2. the wave-transmitting material for the millimeter wave radome of claim 1, wherein the fiber is one or more of glass fiber, quartz fiber and Kevlar fiber.
3. The wave-transmitting material for the millimeter wave radome of claim 1, wherein the fiber form is not particularly required, and the material can be short fiber, long fiber, continuous fiber woven cloth and fiber felt.
4. The wave-transmitting material for the millimeter wave radome of claim 1, wherein the mass percentage of the fiber and the polyether sulfone resin is 20: 80-70: 30.
5. the wave-transmitting material for the millimeter wave radome of claim 1, wherein the adhesive is one or more of epoxy resin adhesive, acrylic resin adhesive and polyurethane resin adhesive.
6. the wave-transmitting material for the millimeter wave radome of claim 1, wherein the thickness of the upper skin is 0.1-2 mm.
7. the wave-transmitting material for the millimeter wave radome of claim 1, wherein the thickness of the lower skin is 0.1-2 mm.
8. the wave-transmitting material for the millimeter wave radome of claim 1, wherein the thickness of the bonding layer is 0.05-0.2 mm.
9. The wave-transmitting material for the millimeter wave radome of claim 1, wherein the thickness of the core layer is 1-3 mm.
10. a method for forming the wave-transparent material for the millimeter wave radome according to any one of claims 1-9, comprising the following steps:
sequentially paving a polyether sulfone film, continuous fiber woven cloth or fiber felt and a polyether sulfone film in a hot press die, and carrying out hot pressing at the temperature of 340-390 ℃ to obtain a fiber reinforced polyether sulfone resin composite material serving as an upper skin layer and a lower skin layer;
or adding the polyether sulfone resin and short fibers or long fibers or continuous fibers into a sheet extruder, and performing melt extrusion on the sheet at the temperature of 300-390 ℃ to obtain a fiber-reinforced polyether sulfone resin composite material serving as an upper skin layer and a lower skin layer;
or adding the polyether sulfone resin into a casting machine, melting and casting the resin to form a film within the temperature range of 340-390 ℃, introducing the continuous fiber or the continuous fiber woven fabric or the fiber felt into a die head of the casting machine, infiltrating the continuous fiber or the continuous fiber woven fabric or the fiber felt with the molten polyether sulfone resin extruded by the die head, rolling and cooling to obtain the fiber reinforced polyether sulfone resin composite material as an upper skin layer and a lower skin layer;
Step (2), sequentially paving a lower skin, a binder, core layer foam, the binder and an upper skin in a die, and preheating to 200-240 ℃;
And (3) carrying out hot pressing or vacuum forming at the temperature of 200-240 ℃, maintaining the pressure for 10-120 s, and demolding to obtain the wave-transmitting material for the radome.
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