CN111421937A - Composite material for 5G millimeter wave antenna housing and preparation method thereof - Google Patents

Composite material for 5G millimeter wave antenna housing and preparation method thereof Download PDF

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Publication number
CN111421937A
CN111421937A CN202010147213.2A CN202010147213A CN111421937A CN 111421937 A CN111421937 A CN 111421937A CN 202010147213 A CN202010147213 A CN 202010147213A CN 111421937 A CN111421937 A CN 111421937A
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composite material
skin layer
fiber
sheet
millimeter wave
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Chinese (zh)
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袁角亮
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Shanghai Allied Industrial Co ltd
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Shanghai Allied Industrial Co ltd
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    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
    • 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
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
    • 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
    • B32B27/18—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
    • B32B27/281—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 polyimides
    • 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
    • B32B27/285—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 polyethers
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • 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
    • B32B7/10—Interconnection of layers at least one layer having inter-reactive 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
    • 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
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0264—Polyester
    • 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
    • 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
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • 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
    • B32B2307/70—Other properties
    • B32B2307/712—Weather resistant

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Laminated Bodies (AREA)

Abstract

A composite material for a 5G millimeter wave antenna housing and a preparation method thereof relate to the technical field of 5G communication. The composite material for the 5G millimeter wave antenna housing comprises a skin layer and a core layer, wherein the skin layer is made of a thermoplastic resin material or a fiber-reinforced thermoplastic composite material; the core layer is a thermoplastic foam material. According to the scheme, the modified thermoplastic material is used as the covering layer, the characteristics of flame retardance, weather resistance and the like of the covering material can be realized through modification, and meanwhile, the requirements of various appearance colors of the antenna cover can be realized through color matching; the problems that the traditional thermosetting skin material is low in flame retardance, poor in weather resistance and incapable of matching colors, and weather resistance, appearance beautification and the like are realized by spraying paint are solved; meanwhile, the core layer thermoplastic foam material also has excellent flame retardant property, and the problem of poor flame retardant property of the traditional thermosetting foam material is solved.

Description

Composite material for 5G millimeter wave antenna housing and preparation method thereof
Technical Field
The invention relates to the technical field of 5G communication, in particular to an antenna housing.
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 radome is mostly a sandwich structure composite material, such as a foam sandwich structure 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, easy occurrence of overlarge and uneven splicing seams and the like, 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.
Disclosure of Invention
The invention aims to provide a composite material for a 5G millimeter wave antenna housing, which aims to solve the technical problem.
The invention aims to provide a preparation method of a composite material for a 5G millimeter wave antenna housing, so as to prepare the composite material for the 5G millimeter wave antenna housing.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
the composite material for the 5G millimeter wave antenna housing comprises a skin layer and a core layer, and is characterized in that the skin layer is made of a thermoplastic resin material or a fiber-reinforced thermoplastic composite material; the core layer is a thermoplastic foam material.
According to the scheme, the modified thermoplastic material is used as the covering layer, the characteristics of flame retardance, weather resistance and the like of the covering material can be realized through modification, and meanwhile, the requirements of various appearance colors of the antenna cover can be realized through color matching; the problems that the traditional thermosetting skin material is low in flame retardance, poor in weather resistance and incapable of matching colors, and weather resistance, appearance beautification and the like are realized by spraying paint are solved; meanwhile, the core layer thermoplastic foam material also has excellent flame retardant property, and the problem of poor flame retardant property of the traditional thermosetting foam material is solved.
Preferably, the thermoplastic resin material is one or more of modified polycarbonate resin, modified polyphenylene ether resin, modified polyphenylene sulfide resin, and modified polyetherimide resin.
Preferably, the fiber-reinforced thermoplastic composite material is one or more of a fiber-reinforced polycarbonate resin composite material, a fiber-reinforced polyphenylene ether resin composite material, a fiber-reinforced polyphenylene sulfide resin composite material and a fiber-reinforced polyetherimide resin composite material;
preferably, the thermoplastic foam material is one or more of polycarbonate foam material, polyphenyl ether foam material and polyetherimide foam material.
Further preferably, the foam material is preferably a closed cell microfoaming material, preferably having a density of 20kg/m3～120kg/m3The dielectric constant is preferably 1.05 to 1.3, and the loss tangent is preferably 0.0006 to 0.02;
preferably, the composite material for the 5G millimeter wave antenna housing is a sandwich structure, the sandwich structure is preferably an A sandwich structure or a C sandwich structure, wherein the A sandwich structure is composed of a skin layer, a core layer and a skin layer from top to bottom in sequence, and the C sandwich structure is composed of a skin layer, a core layer, a skin layer, a core layer and a skin layer from top to bottom in sequence.
Preferably, the thickness of the skin layer is 0.08 mm-3 mm, and the thickness of the core layer is 1 mm-6 mm.
And a layer of adhesive film can be added between the skin layer and the core layer according to the requirement.
A preparation method of a composite material for a 5G millimeter wave antenna housing is characterized by comprising the following steps:
adding modified thermoplastic resin into a sheet extruder, heating, melting and extruding to obtain a thermoplastic resin sheet serving as a skin layer;
or adding the modified thermoplastic resin, short fiber or long fiber or continuous fiber into a sheet extruder, heating, melting and extruding to obtain a fiber-reinforced thermoplastic composite material sheet as a skin layer;
or adding the modified thermoplastic resin into a casting machine, heating, melting and casting to obtain a thermoplastic resin sheet as a skin layer;
or adding the modified thermoplastic resin into a casting machine, heating, melting, casting to form a film, introducing continuous fibers or continuous fiber woven cloth or fiber felt into a casting machine die head, infiltrating with molten resin extruded by the die head, rolling, and cooling to obtain a fiber-reinforced thermoplastic resin composite material sheet as an upper skin layer and a lower skin layer;
step (2), sequentially paving a skin layer sheet, core layer foam and a skin layer sheet in a hot press die according to the A sandwich structure;
or sequentially paving the skin layer sheet, the core layer foam, the skin layer sheet, the core layer foam and the skin layer sheet in a hot press die according to the C sandwich structure;
and (3) heating the surface of the skin layer attached to the foam by adopting infrared rays, after the surface of the skin layer attached surface is partially fused, closing a mold by using a hot press, laminating to integrate the skin layer and the core layer foam, and demolding to obtain the A sandwich structure composite material or the C sandwich structure composite material for the 5G millimeter wave antenna cover.
The preparation method of the composite material for the 5G millimeter wave antenna housing can be realized by the following technical scheme:
sequentially paving the skin sheet manufactured in the step (1) in a hot press die according to the sandwich structure A, wherein the skin sheet, the adhesive film, the semi-foaming particles, the adhesive film and the skin sheet are sequentially paved in the hot press die; or sequentially paving a skin layer sheet, an adhesive film, semi-foaming particles, an adhesive film, a skin layer sheet, an adhesive film, semi-foaming particles, an adhesive film and a skin layer sheet in a hot press die according to the C sandwich structure; then closing the hot press, heating and pressurizing to ensure that the semi-foaming particles continue to foam and fill the whole core layer, and bonding the skin layer and the core layer into a whole through the adhesive film; and cooling and demolding to obtain the A sandwich structure composite material or the C sandwich structure composite material for the 5G millimeter wave antenna housing.
The preparation method of the composite material for the 5G millimeter wave antenna housing can be realized by the following technical scheme:
and (2) placing the thermoplastic foam material into an injection mold, melting the modified thermoplastic resin or the fiber reinforced thermoplastic resin material through an injection molding machine, injecting into the mold, coating a layer of skin material on the outer surface of the foam material, and demolding to obtain the A sandwich structure composite material or the C sandwich structure composite material for the 5G millimeter wave antenna housing.
In the fiber-reinforced thermoplastic composite material, the mass percentage of the fiber content is 5 wt% -70 wt%;
the semi-foaming particles are one or more of semi-foaming polyphenyl ether particles and semi-foaming polycarbonate particles; the particle morphology is preferably spherical or elliptical, and the particle diameter is preferably from 2mm to 5 mm.
The composite material system for the antenna housing is a thermoplastic material, and the thermoplastic material is heated and meltable, so that the antenna housing layer and the core layer material are effectively laminated, the production efficiency of the product can be greatly improved, the manufacturing cost of the product is reduced, and the requirement of civil large-batch product production is met.
Compared with the prior art, the invention has the beneficial effects that:
the scheme adopts a full thermoplastic material system, reasonably optimizes the structure of the cover layer and the core layer, replaces the traditional thermosetting material-containing system, has excellent wave-transmitting performance, can also greatly simplify the production and processing procedures of the antenna cover product, improves the production efficiency, and is suitable for large-batch automatic production, thereby greatly reducing the preparation cost of the product and meeting the low-cost large-batch production requirement of the civil 5G antenna cover in the future; and the material system can be recycled and is environment-friendly.
Drawings
Fig. 1 is a schematic layer structure diagram of one structure of a composite material for a 5G millimeter wave radome;
fig. 2 is a schematic layer structure diagram of another structure of the composite material for the 5G millimeter wave radome.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below.
Referring to fig. 1 and 2, the composite material for the 5G millimeter wave radome is composed of a skin layer and a core layer. The sandwich structure is preferably a sandwich structure, the sandwich structure is preferably an A sandwich structure or a C sandwich structure, wherein the A sandwich structure is composed of a skin layer 1, a core layer 2 and a skin layer 1 from top to bottom in sequence, and the C sandwich structure is composed of the skin layer 1, the core layer 2, the skin layer 1, the core layer 2 and the skin layer 1 from top to bottom in sequence.
Example 1
The composite material for the 5G millimeter wave antenna housing is of an A sandwich structure; the composite material consists of an upper skin 1 of modified polycarbonate resin, a core layer 2 of polycarbonate closed-cell micro-foaming foam and a lower skin 3 of modified polycarbonate resin; wherein the thickness of the upper skin and the lower skin is 0.08mm, and the thickness of the core layer is 6 mm; the foam density of the core layer is 120kg/m3The dielectric constant was 1.3 and the loss tangent was 0.02. The preparation method comprises the following steps:
step (1), adding the modified polycarbonate resin into a casting machine, heating, melting and casting to obtain a polycarbonate resin sheet as an upper skin layer and a lower skin layer;
step (2), sequentially paving a skin layer sheet, core layer foam and a skin layer sheet in a hot press die according to the A sandwich structure;
and (3) heating the surface of the skin layer attached to the foam by adopting infrared rays, closing a mold by using a hot press after the surface of the skin layer attached surface is partially fused, laminating to integrate the skin layer and the core layer foam, and demolding to obtain the A sandwich structure composite material for the 5G millimeter wave antenna housing.
Example 2
The composite material for the 5G millimeter wave antenna housing is of an A sandwich structure; the composite material consists of an upper skin 1, a core layer 2, polyphenyl ether closed-cell micro-foaming foam and a lower skin 3, wherein the polyphenyl ether resin is fiber-reinforced; wherein the thickness of the upper skin and the lower skin is 0.25mm, and the thickness of the core layer is 3 mm; the foam density of the core layer is 20kg/m3The dielectric constant was 1.05 and the loss tangent was 0.0006. The preparation method comprises the following steps:
step (1), adding polyphenyl ether resin and continuous fibers into a sheet extruder, heating, melting and extruding to obtain a fiber-reinforced polyphenyl ether resin composite material sheet serving as a skin layer; wherein the mass content of the fibers in the composite material is 5 wt%;
step (2), sequentially paving a skin layer sheet, core layer foam and a skin layer sheet in a hot press die according to the A sandwich structure;
and (3) heating the surface of the skin layer attached to the foam by adopting infrared rays, closing a mold by using a hot press after the surface of the skin layer attached surface is partially fused, laminating to integrate the skin layer and the core layer foam, and demolding to obtain the A sandwich structure composite material for the 5G millimeter wave antenna housing.
Example 3
The composite material for the 5G millimeter wave antenna housing is of an A sandwich structure; the composite material consists of an upper skin 1, a core layer 2, a polyetherimide closed-cell micro-foaming foam and a lower skin 3, wherein the fiber of the upper skin is reinforced with the polyetherimide resin; wherein the thickness of the upper and lower skins is 3mm, and the thickness of the core layer is 5 mm; the foam density of the core layer is 50kg/m3The dielectric constant was 1.09, and the loss tangent was 0.0009. The preparation method comprises the following steps:
step (1), adding polyetherimide resin into a casting machine, heating, melting, casting to form a film, introducing continuous fiber woven cloth into a casting machine die head, infiltrating with molten resin extruded by the die head, rolling, and cooling to obtain a fiber-reinforced polyetherimide resin composite material sheet serving as an upper skin layer and a lower skin layer; (ii) a Wherein the mass content of the fibers in the composite material is 70 wt%;
step (2), sequentially paving a skin layer sheet, core layer foam and a skin layer sheet in a hot press die according to the A sandwich structure;
and (3) heating the surface of the skin layer attached to the foam by adopting infrared rays, closing a mold by using a hot press after the surface of the skin layer attached surface is partially fused, laminating to integrate the skin layer and the core layer foam, and demolding to obtain the A sandwich structure composite material for the 5G millimeter wave antenna housing.
Example 4
The composite material for the 5G millimeter wave antenna housing is of a C sandwich structure; the composite material consists of an upper skin 1 modified polyphenyl ether resin, a core layer 2 polyphenyl ether closed-cell micro-foaming foam, a middle skin 3 modified polyphenyl ether resin, a core layer 4 polyphenyl ether closed-cell micro-foaming foam and a lower skin 5 modified polyphenyl ether resin; wherein the thickness of the upper, middle and lower skins is 1mm, and the thickness of each core layer is 1 mm; the foam density of the core layer is 90kg/m3The dielectric constant was 1.14 and the loss tangent was 0.0023. The preparation method comprises the following steps:
adding modified polyphenylene ether resin into a sheet extruder, heating, melting and extruding to obtain a polyphenylene ether resin sheet serving as a skin layer;
step (2), sequentially paving a skin layer sheet, core layer foam, a skin layer sheet, core layer foam and a skin layer sheet in a hot press die according to the C sandwich structure;
and (3) heating the surface of the skin layer attached to the foam by adopting infrared rays, closing a mold by using a hot press after the surface of the skin layer attached surface is partially fused, laminating to integrate the skin layer and the core layer foam, and demolding to obtain the C sandwich structure composite material for the 5G millimeter wave antenna housing.
Example 5
The composite material for the 5G millimeter wave antenna housing is of an A sandwich structure; the composite material consists of an upper skin 1 modified polyphenyl ether resin, a core layer 2 polyphenyl ether closed-cell micro-foaming foam and a lower skin 3 modified polyphenyl ether resin; wherein the thickness of the upper and lower skins is 0.3mm, and the thickness of the core layer is 4 mm; the foam density of the core layer is 110kg/m3Dielectric constant of 1.2, lossThe tan delta was 0.01. The preparation method comprises the following steps:
step (1), adding polyphenyl ether resin into a casting machine, heating, melting and casting to obtain a polyphenyl ether resin sheet serving as a skin layer;
step (2), sequentially paving a skin layer sheet, a glue film, semi-foamed polyphenyl ether particles, a glue film and a skin layer sheet in a hot press mould according to the A sandwich structure; then closing the hot press, heating and pressurizing to ensure that the semi-foaming polyphenyl ether particles are continuously foamed and filled in the whole core layer, and bonding the skin layer and the core layer into a whole through the adhesive film; cooling and demolding to obtain the A sandwich structure composite material for the 5G millimeter wave antenna housing; wherein the semi-foaming polyphenyl ether particles are elliptical, and the diameter of the particles is 3 mm.
Example 6
The composite material for the 5G millimeter wave antenna housing is of an A sandwich structure; the composite material consists of an upper skin 1, a core layer 2, polyetherimide closed-cell micro-foaming foam and a lower skin 3, wherein the fiber is reinforced by polyphenylene sulfide resin; wherein the thickness of the upper and lower skins is 2mm, and the thickness of the core layer is 3 mm; the foam density of the core layer is 70kg/m3The dielectric constant was 1.09, and the loss tangent was 0.0012. The preparation method comprises the following steps:
placing the polyetherimide closed-cell micro-foaming material into an injection mold, melting fiber reinforced polyphenylene sulfide resin through an injection molding machine, injecting the melted resin into the mold, completely coating a layer of skin material on the outer surface of the polyetherimide foam material, and demolding to obtain an A sandwich structure composite material for the 5G millimeter wave antenna housing; wherein the total fiber mass content of the fiber reinforced polyphenylene sulfide resin material is 20 wt%.
For example 1～6, the composite material obtained is subjected to performance test, and the test results are shown in the following table 1:
table 1: test results
Figure BDA0002401187170000071
As can be seen from the table 1, the composite material for the antenna housing prepared by the scheme has excellent flame retardance and weather resistance, and meanwhile, the composite material has excellent wave transmission 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. The composite material for the 1.5G millimeter wave antenna housing comprises a skin layer and a core layer, and is characterized in that the skin layer is made of a thermoplastic resin material or a fiber-reinforced thermoplastic composite material; the core layer is a thermoplastic foam material.
  2. 2. The composite material for a 5G millimeter wave radome of claim 1, wherein the thermoplastic resin material is one or more of a modified polycarbonate resin, a modified polyphenylene ether resin, a modified polyphenylene sulfide resin, and a modified polyetherimide resin;
    the fiber-reinforced thermoplastic composite material is one or more of a fiber-reinforced polycarbonate resin composite material, a fiber-reinforced polyphenylene ether resin composite material, a fiber-reinforced polyphenylene sulfide resin composite material and a fiber-reinforced polyetherimide resin composite material.
  3. 3. The composite material for the 5G millimeter wave radome of claim 1 or 2, wherein the thermoplastic foam material is one or more of polycarbonate foam material, polyphenylene oxide foam material and polyetherimide foam material.
  4. 4. The composite material for a 5G millimeter wave radome of claim 3, wherein the thermoplastic foam material is a closed cell micro-foam material having a density of 20kg/m3～120kg/m3The dielectric constant is 1.05 to 1.3, and the loss tangent is 0.0006 to 0.02.
  5. 5. The composite material for the 5G millimeter wave radome of claim 1 or 2, wherein the composite material for the 5G millimeter wave radome is of a sandwich structure, and the sandwich structure is an A sandwich structure or a C sandwich structure;
    wherein the sandwich structure A sequentially comprises a skin layer, a core layer and a skin layer from top to bottom,
    the sandwich structure C comprises a skin layer, a core layer, a skin layer, a core layer and a skin layer from top to bottom in sequence.
  6. 6. The composite material for a 5G millimeter wave radome of claim 5, wherein an adhesive film is arranged between the skin layer and the core layer.
  7. 7. A preparation method of a composite material for a 5G millimeter wave antenna housing is characterized by comprising the following steps:
    adding modified thermoplastic resin into a sheet extruder, heating, melting and extruding to obtain a thermoplastic resin sheet serving as a skin layer;
    or adding the modified thermoplastic resin, short fiber or long fiber or continuous fiber into a sheet extruder, heating, melting and extruding to obtain a fiber-reinforced thermoplastic composite material sheet as a skin layer;
    or adding the modified thermoplastic resin into a casting machine, heating, melting and casting to obtain a thermoplastic resin sheet as a skin layer;
    or adding the modified thermoplastic resin into a casting machine, heating, melting, casting to form a film, introducing continuous fibers or continuous fiber woven cloth or fiber felt into a casting machine die head, infiltrating with molten resin extruded by the die head, rolling, and cooling to obtain a fiber-reinforced thermoplastic resin composite material sheet as an upper skin layer and a lower skin layer;
    step (2), sequentially paving a skin layer sheet, core layer foam and a skin layer sheet in a hot press die according to the A sandwich structure;
    or sequentially paving the skin layer sheet, the core layer foam, the skin layer sheet, the core layer foam and the skin layer sheet in a hot press die according to the C sandwich structure;
    and (3) heating the surface of the skin layer attached to the foam by adopting infrared rays, after the surface of the skin layer attached surface is partially fused, closing a mold by using a hot press, laminating to integrate the skin layer and the core layer foam, and demolding to obtain the A sandwich structure composite material or the C sandwich structure composite material for the 5G millimeter wave antenna cover.
  8. 8. A preparation method of a composite material for a 5G millimeter wave antenna housing is characterized by comprising the following steps:
    adding modified thermoplastic resin into a sheet extruder, heating, melting and extruding to obtain a thermoplastic resin sheet serving as a skin layer;
    or adding the modified thermoplastic resin, short fiber or long fiber or continuous fiber into a sheet extruder, heating, melting and extruding to obtain a fiber-reinforced thermoplastic composite material sheet as a skin layer;
    or adding the modified thermoplastic resin into a casting machine, heating, melting and casting to obtain a thermoplastic resin sheet as a skin layer;
    or adding the modified thermoplastic resin into a casting machine, heating, melting, casting to form a film, introducing continuous fibers or continuous fiber woven cloth or fiber felt into a casting machine die head, infiltrating with molten resin extruded by the die head, rolling, and cooling to obtain a fiber-reinforced thermoplastic resin composite material sheet as an upper skin layer and a lower skin layer;
    step (2), sequentially paving a skin layer sheet, an adhesive film, semi-foaming particles, an adhesive film and a skin layer sheet in a hot press die according to the A sandwich structure;
    or sequentially paving a skin layer sheet, an adhesive film, semi-foaming particles, an adhesive film, a skin layer sheet, an adhesive film, semi-foaming particles, an adhesive film and a skin layer sheet in a hot press die according to the C sandwich structure;
    closing the hot press, heating and pressurizing to ensure that the semi-foaming particles are continuously foamed to fill the whole core layer, and bonding the skin layer and the core layer into a whole through the adhesive film; and cooling and demolding to obtain the A sandwich structure composite material or the C sandwich structure composite material for the 5G millimeter wave antenna housing.
  9. 9. A preparation method of a composite material for a 5G millimeter wave antenna housing is characterized in that a thermoplastic foam material is placed in an injection mold, a modified thermoplastic resin or fiber reinforced thermoplastic resin material is melted by an injection molding machine and then injected into the mold, a layer of skin material is coated on the outer surface of the foam material, and demolding is carried out to obtain an A sandwich structure composite material or a C sandwich structure composite material for the 5G millimeter wave antenna housing.
  10. 10. The preparation method of the composite material for the 5G millimeter wave radome as claimed in claim 7, 8 or 9, wherein the fiber content in the fiber-reinforced thermoplastic composite material is 5 wt% to 70 wt% by mass.
CN202010147213.2A 2020-03-05 2020-03-05 Composite material for 5G millimeter wave antenna housing and preparation method thereof Pending CN111421937A (en)

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