CN115284700A - Light high-strength composite wave-absorbing foam board and preparation method thereof - Google Patents

Light high-strength composite wave-absorbing foam board and preparation method thereof Download PDF

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Publication number
CN115284700A
CN115284700A CN202210712881.4A CN202210712881A CN115284700A CN 115284700 A CN115284700 A CN 115284700A CN 202210712881 A CN202210712881 A CN 202210712881A CN 115284700 A CN115284700 A CN 115284700A
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China
Prior art keywords
wave
foam
absorbing
fiber
absorbing foam
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CN202210712881.4A
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Chinese (zh)
Inventor
王刚
李国太
徐汝淳
邓嘉中
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Foshan Kaitaiwei Advanced Materials Co ltd
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Foshan Kaitaiwei Advanced Materials Co ltd
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Priority to CN202210712881.4A priority Critical patent/CN115284700A/en
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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
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/046—Layered products comprising a layer of metal comprising metal 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/092—Layered products comprising a layer of metal comprising metal 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 comprising epoxy resins
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • 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
    • B32B27/38—Layered products comprising a layer of synthetic resin comprising epoxy resins
    • 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • 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
    • B32B5/22—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/32—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 the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed at least two layers being foamed and next to each other
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H3/00—Camouflage, i.e. means or methods for concealment or disguise
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B32B2255/102—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer synthetic resin or rubber layer being a foamed layer
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite 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
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0221—Vinyl resin
    • B32B2266/0235—Vinyl halide, e.g. PVC, PVDC, PVF, PVDF
    • 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
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/212—Electromagnetic interference shielding
    • 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
    • B32B2307/718—Weight, e.g. weight per square meter

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses a light high-strength composite wave-absorbing foam board and a preparation method thereof, belonging to the technical field of radar stealth and comprising an upper skin, wave-absorbing foam, a reflecting layer and a lower skin, wherein the wave-absorbing foam is arranged between the upper skin and the lower skin, the reflecting layer is arranged between the lower skin and the wave-absorbing foam, the upper skin is made of a long fiber reinforced composite material with better wave-transmitting performance, the fiber can be made of high-transmission glass fiber, quartz fiber, high-density polyethylene fiber, nylon fiber and the like, and the resin can be made of epoxy resin, cyanate ester resin, polyaryletherketone resin and the like. The invention has excellent wave-absorbing performance, the effective absorption frequency band is 1GHz-40GHz, the military radar full-wave band strong absorption can be realized, the vertical flat plate reflectivity is less than or equal to minus 20dB in the design frequency band, and the invention has excellent mechanical property and environmental property.

Description

Light high-strength composite wave-absorbing foam plate and preparation method thereof
Technical Field
The invention belongs to the technical field of radar stealth, and particularly relates to a light high-strength composite wave-absorbing foam board.
Background
The radar wave-absorbing material can be divided into a coating type wave-absorbing material and a structural type wave-absorbing material from the process, and the traditional wave-absorbing coating, wave-absorbing patch and the like can be classified into a coating type. The coating type wave-absorbing material has wide application and the defects of high requirement on the construction process and easy falling off. The structural wave-absorbing material is a multifunctional composite material which can bear and absorb electromagnetic waves and has the advantages of light weight, high strength and the like.
The wave-absorbing foam is a typical structural radar wave-absorbing material, and the mature wave-absorbing foam in the market at present generally comprises two types, one type is soft foam prepared by impregnating a wave-absorbing agent in pores of interconnected pore foam (sponge), the other type is closed-pore hard foam prepared by adding the wave-absorbing agent into a foaming precursor and foaming, and the foam material mainly adopts Polyurethane (PU). The soft foam cannot be carried, and is generally used in a microwave darkroom scene. The hard foam has higher compressive strength, can be used as structural member filler, for example, a high-wave-transmission fiber reinforced resin matrix composite material skin is bonded on the surface of the hard foam to manufacture a wave absorbing plate, and is used in the environments of vehicle body square cabins, house external hanging and the like.
The development of military technology, the stealth technology of vehicles, ground equipment and ships has higher and higher requirements on wave-absorbing materials, and on one hand, the wave-absorbing materials have excellent wave-absorbing performance in the full wave band of military radars, which is difficult to realize by coating type wave-absorbing materials. On the other hand, the requirement on the environmental adaptability of the wave-absorbing material is higher and higher, for example, an ocean battleship must adopt the wave-absorbing material with excellent environmental properties such as corrosion resistance, damp and heat resistance, temperature impact resistance and the like. As mentioned above, polyurethane foam is often used as the existing rigid foam material, and the physical and chemical properties of the foam are difficult to meet the current demands.
Polymethacrylimide foam (PMI foam for short) is a novel high-resolution structural foam material with optimal comprehensive performance at present, and has the advantages of high strength, high and low temperature resistance, water resistance, solvent corrosion resistance and the like. Researchers try to add the wave absorbing agent into the PMI foam precursor to prepare the PMI wave absorbing foam, but the time of the PMI precursor copolymerization foaming process is as long as 7-14 days, and the wave absorbing agent is gathered or settled before foaming, so that the method is difficult to prepare the high-performance wave absorbing foam with the performance meeting the requirements. The invention can fully utilize the advantages of mechanical, physical and chemical properties of PMI foam to prepare light-weight and high-strength wave-absorbing foam.
Disclosure of Invention
The invention aims to: the light high-strength composite wave-absorbing foam plate is provided in order to solve the problems that researchers try to add a wave absorbing agent into a PMI foam precursor to prepare PMI wave-absorbing foam, but the time of the PMI precursor copolymerization foaming process is as long as 7-14 days, the wave absorbing agent is aggregated or settled before foaming, and the method is difficult to prepare high-performance wave-absorbing foam with the performance meeting the requirements.
In order to achieve the purpose, the invention adopts the following technical scheme:
the light high-strength composite wave-absorbing foam plate comprises an upper skin, wave-absorbing foam, a reflecting layer and a lower skin, wherein the wave-absorbing foam is arranged between the upper skin and the lower skin, and the reflecting layer is arranged between the lower skin and the wave-absorbing foam.
As a further description of the above technical solution:
the upper skin is made of long fiber reinforced composite material with good wave-transmitting performance, the fiber can be high-transmittance glass fiber, quartz fiber, high-density polyethylene fiber, nylon fiber and the like, and the resin can be epoxy resin, cyanate ester resin, polyaryletherketone resin and the like.
As a further description of the above technical solution:
the upper skin is formed by selecting one combination of fiber and resin according to designed indexes such as wave-absorbing frequency band, reflectivity and impact resistance, the thickness of the upper skin is 0.2-1.0mm, and the selection principle is as follows: the higher the frequency of the designed frequency band is, the more thin skin with good wave-transmitting performance needs to be selected.
As a further description of the above technical solution:
the type and thickness of the lower skin can be selected from various high-strength fiber reinforced resin composite materials according to designed mechanical properties and environmental requirements, and the reflecting layer can be selected from aluminum foil, copper mesh, conductive resin and the like.
As a further description of the above technical solution:
the wave-absorbing foam is formed by gluing a plurality of layers of PMI foam plates with specific thickness, the used glue solution contains chopped carbon fibers with specific concentration, each layer of foam plate is bonded after the glue solution is solidified and a dielectric layer with negligible thickness is formed, the concentration of the chopped carbon fibers from top to bottom is increased and arranged in a gradient manner, and the dielectric constant of the dielectric layer is increased;
due to the gradient arrangement of the dielectric layers, the multilayer foam has certain equivalent impedance, incident electromagnetic waves are partially reflected at the foam plate/air interface, the other part of the incident electromagnetic waves enter the multilayer foam to generate multiple scattering, refraction and reflection to generate loss, finally, echoes penetrating through the foam/air interface are overlapped with primary reflected waves in phase, and when the intensities of the two waves are equivalent and the phase is one quarter of the wavelength, a zero reflection phenomenon is generated. Therefore, the key parameters determining the wave absorption performance have two aspects: the short carbon fiber bonding dielectric layer is arranged in a gradient mode, and the foam thickness of each layer and the total stacking thickness are adopted. The purpose of wide-frequency strong absorption can be realized by designing and adjusting the two key parameters.
A preparation method of a light high-strength composite wave-absorbing foam plate specifically comprises the following steps:
s1, weighing a certain mass of chopped carbon fibers, epoxy glue, a curing agent and a diluent, and stirring the chopped carbon fibers, the epoxy glue, the curing agent and the diluent at a high speed until the chopped carbon fibers are uniformly distributed to prepare glue solutions with different concentrations. The length of the short carbon fiber is 1-9mm, and the concentration is 0.01-1.5%;
s2, spraying glue solution with certain mass on one surface of the foam board, wherein the glue solution is used in an amount of 30g-100g/m & lt 2 & gt to ensure firm bonding;
s3, arranging and overlapping the foam board sprayed with the glue solution in a flat vulcanizing machine according to the concentration gradient, pressing the foam board to a designed thickness at the temperature of 80-120 ℃, and taking out the foam board after the glue solution is completely cured;
s4, drilling process through holes on the foam board at intervals of 2-5cm, wherein the hole diameter is less than or equal to 2mm, and standing for at least 14 days until the stress is completely released;
s5, preparing upper and lower skins;
s6, cold bonding the upper skin and the lower skin on the upper surface and the lower surface of the foam board in a pressurized state by using low-viscosity epoxy glue cured at low temperature, bonding the reflecting layer in the step if the reflecting layer is needed, and ensuring that the epoxy glue enters the technical hole to form a pinning effect to enhance the bonding strength during bonding;
and S7, trimming and edge sealing treatment.
In the scheme, the PMI foam is selected, so that the prepared wave-absorbing foam has excellent mechanical and physical and chemical properties. In practical application, if the requirement is not high, relatively low-price foams such as polyvinyl chloride (PVC), polyurethane (PU) and the like can still be selected.
In addition, when the wave-absorbing foam plate is applied to non-exposed occasions and is tightly attached to a conductive material (a reflecting back bottom), the upper skin and the lower skin can be removed and directly exposed for use. The high-frequency wave absorbing performance is better because of no influence of the skin.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention has excellent wave-absorbing performance, the effective absorption frequency band is 1GHz-40GHz, the military radar can realize the full-wave-band strong absorption, the vertical flat plate reflectivity is less than or equal to-20 dB at the design frequency band, and the invention has excellent mechanical property and environmental performance.
2. In the invention, when the PMI foam is used, the mechanical property and the environmental property of the wave-absorbing plate are the optimal choices at present.
3. The invention is suitable for other various types of foam boards and has economic efficiency.
Drawings
FIG. 1 is a schematic structural diagram of a light high-strength composite wave-absorbing foam board and a preparation method thereof;
FIG. 2 is a schematic diagram of a technical principle of a light high-strength composite wave-absorbing foam plate and a preparation method thereof according to the present invention;
FIG. 3 is a schematic structural view of a 25mm wave-absorbing foam plate of the light high-strength composite wave-absorbing foam plate and the preparation method thereof;
FIG. 4 is a schematic diagram of a 30mm wave-absorbing foam plate structure of a light high-strength composite wave-absorbing foam plate and a preparation method thereof according to the present invention;
fig. 5 is a schematic diagram of a 55mm wave-absorbing foam plate structure of a light high-strength composite wave-absorbing foam plate and a preparation method thereof.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution:
example 1
The wave-absorbing plate with the thickness of 25mm, the vertical reflectivity R4-8GHz less than or equal to-23dB and the vertical reflectivity R8-18GHz less than or equal to-30 dB is prepared by the following structural design and process steps:
s1, the structural design of the foam plate is shown in figure 3, an upper skin is made of a hollow quartz fiber and cyanate resin composite material with the thickness of 0.2mm, a lower skin is made of a carbon fiber and epoxy resin composite material with the thickness of 0.8mm, the total thickness of the wave-absorbing foam is 24mm, and the wave-absorbing foam is formed by bonding 8 layers of PMI foam through 7 dielectric layers;
s2, using three types of chopped carbon fibers with the lengths of 3mm, 4mm and 6mm, respectively mixing the chopped carbon fibers according to the mass percentage specified in the attached figure 5, stirring the chopped carbon fibers at a high speed to a state that the chopped carbon fibers are uniformly distributed, and preparing glue solutions with different concentrations;
s3, respectively spraying glue solution on foam boards with corresponding thicknesses according to the weight specified in the attached drawing 3;
s4, overlapping the foam board sprayed with the glue solution in a flat vulcanizing machine according to the sequence specified in the attached drawing 3, pressing the foam board to the thickness of 24mm at the temperature of 80 ℃, and taking out the foam board after the glue solution is completely cured;
s5, drilling process through holes on the foam board at intervals of 2cm, wherein the hole diameter is 1.5mm, and placing for at least 14 days;
s6, preparing upper and lower skins;
s7, cold bonding the upper skin and the lower skin on the upper surface and the lower surface of the foam board in a pressurized state by using low-viscosity epoxy glue cured at low temperature, and ensuring that the epoxy glue enters the technical hole to form a pinning effect to enhance the bonding strength during bonding;
and S8, trimming and edge sealing.
Example 2
The wave-absorbing plate with the thickness of 30mm, the vertical reflectivity R2-4GHz less than or equal to-12dB, the vertical reflectivity R4-8GHz less than or equal to-25dB, the vertical reflectivity R8-12GHz less than or equal to-30dB and the vertical reflectivity R12-18GHz less than or equal to-17 dB is prepared by the following structural design and process steps:
s1, the foam plate is structurally designed as shown in an attached figure 4, an upper skin is made of a quartz fiber and epoxy resin composite material with the thickness of 0.5mm, a reflecting layer is made of an aluminum foil with the thickness of 0.1mm, a lower skin is made of a glass fiber and epoxy resin composite material with the thickness of 0.4mm, the total thickness of wave-absorbing foam is 29mm, and the wave-absorbing foam is formed by bonding 9 layers of PMI foam through 8 dielectric layers;
s2, using the chopped carbon fibers with the lengths of 3mm, 4mm, 6mm and 8mm, respectively mixing the chopped carbon fibers according to the mass percentage of the chopped carbon fibers specified in the attached figure 4, stirring the mixture at a high speed until the chopped carbon fibers are uniformly distributed, and preparing glue solutions with different concentrations;
s3, respectively spraying the glue solution on foam boards with corresponding thicknesses according to the weight specified in the attached figure 4;
s4, overlapping the foam board sprayed with the glue solution in a flat vulcanizing machine according to the sequence specified in the attached figure 4, pressing the foam board to the thickness of 29mm at the temperature of 100 ℃, and taking out the foam board after the glue solution is completely cured;
s5, drilling process through holes on the foam board at intervals of 3cm, wherein the hole diameter is 1.5mm, and placing for at least 14 days;
s6, preparing upper and lower skins;
s7, cold bonding the upper skin, the reflecting layer (aluminum foil) and the lower skin on the upper surface and the lower surface of the foam board in a pressurized state by using low-viscosity epoxy glue cured at low temperature, and ensuring that the epoxy glue enters the technical hole to form a pinning effect to enhance the bonding strength during bonding;
and S8, edge cutting and edge sealing treatment.
Example 3
The wave-absorbing plate with the thickness of 55mm, no upper skin and lower skin, the vertical reflectivity R1-2GHz less than or equal to-20dB, the vertical reflectivity R2-4GHz less than or equal to-23dB, the vertical reflectivity R4-8GHz less than or equal to-25dB and the vertical reflectivity R8-18GHz less than or equal to-30 dB is prepared by the following structural design and process steps:
s1, the structural design of the foam plate is shown in figure 5, the total thickness of the wave-absorbing foam is 55mm, and the wave-absorbing foam is formed by bonding 14 layers of PVC foam at intervals of 13 dielectric layers;
s2, using seven types of chopped carbon fibers with the lengths of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm and 9mm, respectively mixing the chopped carbon fibers according to the mass percentage specified in the attached figure 5, stirring the chopped carbon fibers at a high speed until the chopped carbon fibers are uniformly distributed, and preparing glue solutions with different concentrations;
s3, respectively spraying glue solution on foam boards with corresponding thicknesses according to the weight specified in the attached drawing 5;
s4, overlapping the foam board sprayed with the glue solution in a flat vulcanizing machine according to the sequence specified in the attached drawing 5, pressing the foam board to the thickness of 24mm at the temperature of 120 ℃, and taking out the foam board after the glue solution is completely cured;
s5, drilling process through holes on the foam board at intervals of 5cm, wherein the hole diameter is 2.0mm, and placing for at least 14 days;
and S6, trimming.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (6)

1. The light high-strength composite wave-absorbing foam plate comprises an upper skin, wave-absorbing foam, a reflecting layer and a lower skin, and is characterized in that the wave-absorbing foam is arranged between the upper skin and the lower skin, and the reflecting layer is arranged between the lower skin and the wave-absorbing foam.
2. The light-weight high-strength composite wave-absorbing foam board as claimed in claim 1, wherein the upper skin is made of long fiber reinforced composite material with good wave-transmitting performance, the fiber is made of high-transmittance glass fiber, quartz fiber, high-density polyethylene fiber, nylon fiber, etc., and the resin is made of epoxy resin, cyanate ester resin, polyaryletherketone resin, etc.
3. The light-weight high-strength composite wave-absorbing foam plate as claimed in claim 2, wherein the upper skin is made of one of the fiber and resin composition with a thickness of 0.2-1.0mm according to the designed wave-absorbing frequency band and indexes such as reflectivity and impact resistance.
4. The light-weight high-strength composite wave-absorbing foam plate as claimed in claim 1, wherein the type and thickness of the lower skin can be selected from various high-strength fiber reinforced resin composite materials according to designed mechanical properties and environmental requirements, and the reflective layer can be selected from aluminum foil, copper mesh, conductive resin and the like.
5. The light-weight high-strength composite wave-absorbing foam plate as claimed in claim 1, wherein the wave-absorbing foam is formed by gluing a plurality of layers of PMI foam plates with specific thickness, the used glue solution contains chopped carbon fibers with specific concentration, each layer of foam plate is bonded after the glue solution is cured, a dielectric layer with negligible thickness is formed, the concentration of the chopped carbon fibers from top to bottom is increased and arranged in a gradient manner, and the dielectric constant of the dielectric layer is increased.
6. A preparation method of a light weight and high strength composite wave absorbing foam plate according to claims 1 to 5, characterized by comprising the following steps:
s1, weighing a certain mass of chopped carbon fibers, epoxy glue, a curing agent and a diluent, stirring the chopped carbon fibers at a high speed until the chopped carbon fibers are uniformly distributed, and preparing glue solutions with different concentrations. The length of the short carbon fiber is 1-9mm, and the concentration is 0.01-1.5%;
s2, spraying glue solution with certain mass on one surface of the foam board, wherein the glue solution is used in an amount of 30g-100g/m & lt 2 & gt to ensure firm bonding;
s3, arranging and overlapping the foam board sprayed with the glue solution in a flat vulcanizing machine according to the concentration gradient, pressing the foam board to a designed thickness at the temperature of 80-120 ℃, and taking out the foam board after the glue solution is completely cured;
s4, drilling process through holes on the foam board at intervals of 2-5cm, wherein the hole diameter is less than or equal to 2mm, and standing for at least 14 days until the stress is completely released;
s5, preparing upper and lower skins;
s6, cold bonding the upper skin and the lower skin on the upper surface and the lower surface of the foam board in a pressurized state by using low-viscosity epoxy glue cured at low temperature, bonding the reflecting layer in the step if the reflecting layer is needed, and ensuring that the epoxy glue enters the technical hole to form a pinning effect to enhance the bonding strength during bonding;
and S7, trimming and edge sealing treatment.
CN202210712881.4A 2022-06-22 2022-06-22 Light high-strength composite wave-absorbing foam board and preparation method thereof Pending CN115284700A (en)

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CN115674819A (en) * 2023-01-03 2023-02-03 湖南博翔新材料有限公司 Broadband wave-absorbing material and preparation method thereof

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CN109648952A (en) * 2019-01-04 2019-04-19 北京环境特性研究所 A kind of gradient type graphite oxide alkenyl structures absorbing material and preparation method thereof
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CN112519351A (en) * 2020-12-11 2021-03-19 航天科工武汉磁电有限责任公司 Homogeneous wave-absorbing shelter deck and preparation method thereof
CN112646353A (en) * 2020-12-16 2021-04-13 航天科工武汉磁电有限责任公司 Preparation method of impact-resistant skin, impact-resistant wave absorbing plate and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN109648952A (en) * 2019-01-04 2019-04-19 北京环境特性研究所 A kind of gradient type graphite oxide alkenyl structures absorbing material and preparation method thereof
CN211467678U (en) * 2019-12-19 2020-09-11 南京航空航天大学金城学院 Carbon fiber composite material sandwich vehicle body structure
CN112519351A (en) * 2020-12-11 2021-03-19 航天科工武汉磁电有限责任公司 Homogeneous wave-absorbing shelter deck and preparation method thereof
CN112646353A (en) * 2020-12-16 2021-04-13 航天科工武汉磁电有限责任公司 Preparation method of impact-resistant skin, impact-resistant wave absorbing plate and preparation method thereof

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CN115674819A (en) * 2023-01-03 2023-02-03 湖南博翔新材料有限公司 Broadband wave-absorbing material and preparation method thereof
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