CN115230269A - Composite heat-resistant foam radar wave-absorbing material and preparation method thereof - Google Patents
Composite heat-resistant foam radar wave-absorbing material and preparation method thereof Download PDFInfo
- Publication number
- CN115230269A CN115230269A CN202210860165.0A CN202210860165A CN115230269A CN 115230269 A CN115230269 A CN 115230269A CN 202210860165 A CN202210860165 A CN 202210860165A CN 115230269 A CN115230269 A CN 115230269A
- Authority
- CN
- China
- Prior art keywords
- wave
- foam
- absorbing
- layer
- heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/06—Making preforms by moulding the material
- B29B11/12—Compression moulding
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
-
- 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
- B32B15/20—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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- 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
- B32B38/00—Ancillary operations in connection with laminating processes
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
-
- 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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B2038/0052—Other operations not otherwise provided for
- B32B2038/0084—Foaming
-
- 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
- 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
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
-
- 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
- B32B2307/70—Other properties
- B32B2307/718—Weight, e.g. weight per square meter
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
The invention provides a heat-resistant foam radar wave-absorbing material, which comprises a wave-transmitting layer; the wave absorbing layer is compounded on the wave transmitting layer; the shielding layer is compounded on the wave absorbing layer; the wave-transmitting layer is a foam wave-transmitting layer. The composite heat-resistant foam radar wave-absorbing material is a composite radar wave-absorbing material which takes heat-resistant foam as a main body, firstly transmits waves, then absorbs the waves and shields the waves, has the characteristics of light weight and good structural strength, and also has the advantages of wide wave-absorbing frequency band and stable wave-absorbing performance; meanwhile, the heat resistance is good, and the electromagnetic wave power resistance is good. The preparation method provided by the invention is simple in process, easy to control and beneficial to realizing large-scale and continuous production.
Description
Technical Field
The invention belongs to the technical field of radar wave-absorbing materials, relates to a heat-resistant foam radar wave-absorbing material and a preparation method thereof, and particularly relates to a composite heat-resistant foam radar wave-absorbing material and a preparation method thereof.
Background
With the rapid development of modern detection and guidance technologies, aircrafts with special purposes not only require good cruising ability and maneuvering performance, but also require radar detection, so that materials with wave absorbing functions are used for manufacturing airborne facilities. The radar absorbing material with electromagnetic wave absorbing capacity plays a key role in improving the stealth capacity of weapon equipment and the overall operational efficiency, and is highly valued by countries in the world. For modern aircrafts, with the continuous improvement of stealth requirements, a novel efficient electromagnetic wave absorbing material which is characterized by light weight, thin thickness, wide frequency band and strong absorption attracts much attention. Although the ability of the aircraft to avoid radar detection can be improved to a certain extent by the aid of appearance design and coating of a machine body with the wave-absorbing coating, in some special parts with physical support requirements, such as radar antenna covers and other airborne facilities, the effect of weakening reflected electromagnetic waves is achieved by absorbing or attenuating the electromagnetic waves through the high-efficiency wave-absorbing material, and accordingly RCS (radar scattering cross section, which is the most critical concept in radar stealth technology, represents one physical quantity of the intensity of echoes generated by a target under the irradiation of radar waves) is reduced. At present, the requirements of military stealth technology on wave-absorbing materials are increasingly improved, the wave-absorbing materials need to meet the comprehensive requirements of thinness, lightness, width and strength, and the traditional single wave-absorbing material cannot meet the requirements, so that the wave-absorbing materials are developed towards compounding and broadband.
The traditional coating type radar wave-absorbing material has limited wave-absorbing frequency band, low efficiency, heavy weight and poor temperature resistance; meanwhile, the radar wave absorbing material does not have bearing capacity, has single function, and cannot meet the design requirement of radar wave absorbing performance and appearance. At present, structural radar absorbing materials represented by a laminate structure become the mainstream. The wave-absorbing material is prepared by generally impregnating or coating continuous fibers with resin containing a wave-absorbing agent to form continuous fiber prepreg cloth; and then the prepreg cloth with different wave absorbing agent types and contents is subjected to multilayer compounding and curing to form the thin-shell wave absorbing composite material. Meanwhile, a core material (foam or honeycomb material) containing a wave absorbing agent is added in the middle of the continuous fiber prepreg cloth to form the wave absorbing composite material with the sandwich structure. Although the wave-absorbing material of the laminate structure has better radar wave-absorbing effect, the requirement of physical support can be met. However, the laminate structure radar wave-absorbing material with the continuous fiber reinforced composite material as the outer layer has a high relative dielectric constant (generally above 3), which causes strong echo reflection of incident radar waves on an air layer and a structure interface, and has a poor stealth effect; meanwhile, in the curing process of the prepreg cloth, the wave absorbing agent may be redistributed along with the flowing of the resin, so that the wave absorbing performance of the material is unstable. The thin-shell wave-absorbing composite material also has the problem of heavy mass, and cannot meet the requirement of lightweight airborne facilities. For the sandwich structure wave-absorbing composite material, although the light weight design can be realized through the sandwich structure, the problems of poor heat resistance of the foam core material, poor wave-absorbing performance of the honeycomb core material, complex preparation process and the like also exist.
Therefore, how to find a more suitable radar wave-absorbing material, which solves the above problems of the existing radar wave-absorbing materials, has become one of the focuses of great concern of many prospective researchers in the industry.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a heat-resistant foam radar wave-absorbing material and a preparation method thereof, and in particular to a composite heat-resistant foam radar wave-absorbing material, which has the characteristics of light weight and good structural strength, and also has the advantages of wide wave-absorbing frequency band and stable wave-absorbing performance; meanwhile, the heat resistance is good, and the electromagnetic wave power resistance is good. And the process is simple, easy to control and beneficial to realizing large-scale and continuous production.
The invention provides a heat-resistant foam radar wave-absorbing material, which comprises a wave-transmitting layer;
the wave absorbing layer is compounded on the wave transmitting layer;
the shielding layer is compounded on the wave absorbing layer;
the wave-transmitting layer is a foam wave-transmitting layer.
Preferably, the material of the foam wave-transmitting layer comprises one or more of polyaryletherketone foam, polyphenylene sulfide foam, polyetherimide foam and polyphenylene ether foam;
the foam comprises a foam prepared by a supercritical fluid foaming method;
the density of the foam is 60-120 kg/m 3 ；
The wave-transparent layer foam is a foam with a closed cell structure;
the aperture of the wave-transparent layer foam is 50-100 mu m.
Preferably, the wave absorbing layer is a foam wave absorbing layer;
the foam wave absorbing layer comprises a foam wave absorbing layer containing a wave absorbing agent;
the mass content of the wave absorbing agent in the foam is 5-15%.
Preferably, the wave absorbing agent comprises a heat-resistant resistance loss wave absorbing agent and/or a dielectric loss wave absorbing agent;
the resistance loss type wave absorbing agent comprises one or more of carbon black, graphite, metal powder, silicon carbide and carbon fiber;
the dielectric loss type wave absorbing agent comprises one or more of silicon nitride, iron nitride, carbon nano tubes and graphene.
Preferably, the wave absorbing layer is made of one or more of polyaryletherketone foam, polyphenylene sulfide foam, polyetherimide foam and polyphenylene ether foam;
the foam comprises a foam prepared by a supercritical fluid foaming method;
the density of the foam is 60-120 kg/m 3 ；
The wave absorbing layer foam is foam with a closed pore structure;
the aperture of the wave-absorbing layer foam is 100-200 mu m.
Preferably, the thickness of the wave-transparent layer is 5-12 mm;
the thickness of the wave absorbing layer is 10-30 mm;
the thickness of the shielding layer is 0.01-0.03 mm.
Preferably, the shielding layer is made of an O-state aluminum foil;
the heat-resistant foam radar wave-absorbing material has a multilayer structure;
an adhesive layer is also arranged between the wave-transmitting layer and the wave-absorbing layer and/or between the wave-absorbing layer and the shielding layer;
the heat-resistant foam radar wave-absorbing material is a composite heat-resistant foam radar wave-absorbing material.
The invention provides a preparation method of a heat-resistant foam radar wave-absorbing material, which comprises the following steps:
1) Performing mould pressing on the polymer powder to obtain a blank plate, then placing the blank plate in a foaming mould, and filling supercritical carbon dioxide for pressure relief foaming to obtain a polymer foaming foam wave-transmitting material;
mixing polymer powder with a wave absorbing agent, carrying out mould pressing to obtain a blank plate, then placing the blank plate into a foaming mould, and charging supercritical carbon dioxide for pressure relief foaming to obtain a polymer foaming foam wave absorbing material containing the wave absorbing agent;
2) And coating an adhesive among the O-state aluminum foil, the polymer foam wave-transmitting material obtained in the step and the polymer foam wave-absorbing material containing the wave-absorbing agent, and then carrying out pressure curing molding to obtain the heat-resistant foam radar wave-absorbing material.
Preferably, the pressure of the supercritical carbon dioxide is 8-12 MPa;
the dipping time of the supercritical carbon dioxide is 120-240 min;
the temperature of the supercritical carbon dioxide is 260-300 ℃;
the foaming ratio of the polymer foam is 10-20 times.
Preferably, the pressure for the pressure curing molding is 30 to 90KPa;
the temperature for the pressure curing molding is 30-60 ℃;
the time for pressing, curing and molding is 0.5-2 h.
The invention provides a heat-resistant foam radar wave-absorbing material, which comprises a wave-transmitting layer; the wave absorbing layer is compounded on the wave transmitting layer; the shielding layer is compounded on the wave absorbing layer; the wave-transmitting layer is a foam wave-transmitting layer. Compared with the prior art, the invention particularly designs a composite heat-resistant foam radar wave-absorbing material, which takes heat-resistant foam as a main body and is a composite radar wave-absorbing material with wave transmission, wave absorption and back shielding. The radar wave-absorbing material with the structure has the characteristics of light weight and good structural strength, and also has the advantages of wide wave-absorbing frequency band and stable wave-absorbing performance; meanwhile, the heat resistance is good, and the electromagnetic wave power resistance is good.
The heat-resistant foam radar wave-absorbing material provided by the invention is a multilayer foam radar wave-absorbing material prepared by doping different electric loss wave-absorbing agents with thermoplastic engineering plastics serving as matrix resin, adopts foam with micron-sized foam pores, has a lower dielectric constant, has good matching characteristics (electromagnetic waves can enter the material to the maximum extent when being incident to the surface of the material, the direct reflection of the surface of the material is reduced), and has good stealth performance; the structural foam prepared by using special engineering plastics as matrix resin is light in weight, self-flame retardant, good in heat resistance and strong in mechanical property, and can be directly used as a structural radar wave-absorbing material; the specific pore structure characteristics of the foam are further utilized, so that the electromagnetic waves can form multiple reflection and refraction in the foam, the surface absorption is changed into bulk absorption, the absorption of the electromagnetic waves is promoted, and the effective absorption of the electromagnetic waves in a wide frequency band can be realized; meanwhile, the wave absorbing agent with a specific structure such as carbon fiber and the like is used in a composite manner with the foam, so that the wave absorbing material has attenuation characteristics (after electromagnetic waves enter the material, the energy is converted into heat energy or absorbed, and the signal intensity is rapidly reduced or almost completely attenuated). Electromagnetic waves are scattered by the intricate fibers so as to generate electromagnetic waves with opposite phases for cancellation, and reflection of the electromagnetic waves is reduced; in addition, the design of the combined wave-absorbing layer can be matched with different stealth requirements, and the design freedom degree is high. Specifically, wave absorbing foams with different wave absorbing effects can be formed by doping wave absorbing agents with different types and contents in matrix foam, and the wave absorbing layer is designed as required by adopting a multi-layer wave absorbing foam compounding mode; meanwhile, the wave absorbing material can be designed into a gradient wave absorbing layer, so that the wave absorbing effect of multiple frequency bands is further improved.
The preparation method provided by the invention has the advantages of simple process, easy control and contribution to realizing large-scale and continuous production.
Experimental results show that the areal density of the foam radar wave-absorbing material provided by the invention is not more than 4.5kg/m 2 The compressive strength is not lower than 0.5MPa; the weight is light, and the structural strength is good; meanwhile, the heat-resistant temperature can reach 180 ℃, and the reflection in the frequency band of 2-18GHz can reach less than-18 dB.
Drawings
FIG. 1 is a schematic diagram of a composite radar wave-absorbing material provided by the invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
All starting materials for the present invention, without particular limitation as to their source, may be purchased commercially or prepared according to conventional methods well known to those skilled in the art.
All the raw materials of the invention have no special limitation on the purity, and the invention preferably adopts the purity requirement of the conventional preparation field of analytical pure or radar absorbing materials.
All the raw materials, the marks and the acronyms thereof belong to the conventional marks and acronyms in the field, each mark and acronym is clear and definite in the field of related application, and the raw materials can be purchased from the market or prepared by a conventional method by the technical staff in the field according to the marks, the acronyms and the corresponding application.
The invention provides a heat-resistant foam radar wave-absorbing material, which comprises a wave-transmitting layer;
the wave absorbing layer is compounded on the wave transmitting layer;
the shielding layer is compounded on the wave absorbing layer;
the wave-transmitting layer is a foam wave-transmitting layer.
In the present invention, the material of the foam wave-transmitting layer preferably includes one or more of polyaryletherketone foam, polyphenylene sulfide foam, polyetherimide foam and polyphenylene ether foam, and more preferably polyaryletherketone foam, polyphenylene sulfide foam, polyetherimide foam or polyphenylene ether foam.
In the present invention, the foam preferably includes a foam prepared using a supercritical fluid foaming method.
In the present invention, the density of the foam wave-transmitting layer is preferably 60 to 120kg/m 3 More preferably 70 to 110kg/m 3 More preferably 80 to 100kg/m 3 。
In the present invention, the wave-transparent layer foam is preferably a foam having a closed cell structure.
In the present invention, the pore size of the wave-transmitting layer foam is preferably 50 to 100. Mu.m, more preferably 60 to 90 μm, and still more preferably 70 to 80 μm.
In the invention, the wave absorbing layer is preferably a foam wave absorbing layer.
In the invention, the foam wave-absorbing layer preferably comprises a foam wave-absorbing layer containing a wave-absorbing agent.
In the present invention, the mass content of the wave absorber in the foam is preferably 5% to 15%, more preferably 7% to 13%, and still more preferably 9% to 11%.
In the invention, the wave-absorbing layer preferably comprises one wave-absorbing layer or a plurality of wave-absorbing layers which are laminated. Specifically, the multilayer laminated wave-absorbing layer may be one or more of wave-absorbing agents with different thicknesses, different types and different contents, and/or a multilayer laminated wave-absorbing layer with gradient arrangement. The gradient is preferably designed in a gradient mode, different wave absorbing effects are achieved through the cooperation of different wave absorbing agents and contents, and the principle that the wave absorbing effect is gradually improved from the wave transmitting layer to the shielding layer is followed.
In the present invention, the wave absorber preferably includes a heat-resistant resistance loss type wave absorber and/or a dielectric loss type wave absorber, and more preferably a heat-resistant resistance loss type wave absorber or a dielectric loss type wave absorber.
In the present invention, the resistance loss type wave absorber preferably includes one or more of carbon black, graphite, metal powder, silicon carbide, and carbon fiber, and more preferably carbon black, graphite, metal powder, silicon carbide, or carbon fiber.
In the present invention, the dielectric loss type absorber preferably includes one or more of silicon nitride, iron nitride, carbon nanotubes, and graphene, and more preferably, silicon nitride, iron nitride, carbon nanotubes, or graphene.
Furthermore, in the invention, the uniformly dispersed wave absorbing agent can become a core for bubble growth in the foaming process, and finally a structure for blocking electromagnetic waves in three dimensions can be formed, so that the path of the electromagnetic waves penetrating through the material is prolonged, and the absorption effect is improved.
In the invention, the material of the wave-absorbing layer preferably comprises one or more of polyaryletherketone foam, polyphenylene sulfide foam, polyetherimide foam and polyphenylene ether foam, and more preferably polyaryletherketone foam, polyphenylene sulfide foam, polyetherimide foam or polyphenylene ether foam.
In the present invention, the foam preferably includes a foam prepared using a supercritical fluid foaming method.
In the invention, the density of the foam wave-absorbing layer is preferably 60-120 kg/m 3 More preferably 70 to 110kg/m 3 More preferably 80 to 100kg/m 3 。
In the invention, the foam density of the foam wave-transmitting layer is preferably smaller than that of the foam wave-absorbing layer. Specifically, the wave absorbing agent is added into the wave absorbing layer, and the foaming of the wave absorbing layer is controlled by controlling the wave absorbing agent and the content of the wave absorbing agent, so that the foam density and the pore size of the wave absorbing layer are larger than those of the foam wave transmitting layer, and the wave absorbing effect of the wave absorbing layer is further enhanced and the wave absorbing layer is matched with the wave transmitting layer.
In the invention, the wave-absorbing layer foam is preferably foam with a closed cell structure.
In the invention, the pore diameter of the wave-absorbing layer foam is preferably 100-200 μm, more preferably 120-180 μm, and more preferably 140-160 μm.
In the present invention, the thickness of the wave-transmitting layer is preferably 5 to 12mm, more preferably 6 to 11mm, more preferably 7 to 10mm, and more preferably 8 to 9mm.
In the present invention, the thickness of the wave-absorbing layer is preferably 10 to 30mm, more preferably 14 to 26mm, and more preferably 18 to 22mm.
In the present invention, the thickness of the shielding layer is preferably 0.01 to 0.03mm, more preferably 0.014 to 0.026mm, and more preferably 0.018 to 0.022mm.
In the present invention, the material of the shielding layer is preferably an O-state aluminum foil.
In the invention, the heat-resistant foam radar absorbing material preferably has a multilayer structure.
In the invention, an adhesive layer is preferably included between the wave-transparent layer and the wave-absorbing layer and/or between the wave-absorbing layer and the shielding layer.
In the invention, the heat-resistant foam radar wave-absorbing material is preferably a composite heat-resistant foam radar wave-absorbing material.
The invention is a complete and refined integral technical scheme, further improves the structural strength, the heat resistance, the electromagnetic wave resistance power, a wider wave-absorbing frequency band and more stable wave-absorbing performance of the heat-resistant foam radar wave-absorbing material, and the heat-resistant foam radar wave-absorbing material can be specifically of the following structure:
the composite heat-resistant foam radar wave-absorbing material has a multilayer structure and comprises a wave-transmitting layer, a wave-absorbing layer and a shielding layer which are connected and compounded by adopting an adhesive.
Specifically, the wave-transmitting layer is one or more of polyaryletherketone, polyphenylene sulfide, polyetherimide and polyphenylene ether prepared by supercritical fluid foaming technology, preferably polyaryletherketone.
Specifically, the foam density is 60kg/m 3 ～120kg/m 3 Preferably 80kg/m 3 ～120kg/m 3 。
Specifically, the wave absorbing layer is foam containing a wave absorbing agent prepared by a supercritical fluid foaming technology.
Wherein, the content of the wave absorbing agent in the foam is 5 to 15 percent, preferably 8 to 12 percent.
Specifically, the wave absorbing agent is a heat-resistant resistance loss type wave absorbing agent or a dielectric loss type wave absorbing agent. Wherein, the resistance loss type wave absorbing agent is one or more of carbon black, graphite, metal powder, silicon carbide and carbon fiber. The dielectric loss type wave absorbing agent is one or more of silicon nitride, iron nitride, carbon nano tube and graphene. The foam material is one or more of polyaryletherketone, polyethersulfone, polyphenylene sulfide, polyetherimide and polyphenylene ether, preferably polyaryletherketone.
Specifically, the shielding layer is an O-state aluminum foil with the thickness of 0.01-0.03 mm.
The invention provides a preparation method of a heat-resistant foam radar wave-absorbing material, which comprises the following steps:
1) Performing mould pressing on the polymer powder to obtain a blank plate, then placing the blank plate in a foaming mould, and filling supercritical carbon dioxide for pressure relief foaming to obtain a polymer foaming foam wave-transmitting material;
mixing polymer powder with a wave absorbing agent, performing mould pressing to obtain a blank plate, then placing the blank plate into a foaming mould, and filling supercritical carbon dioxide for pressure relief foaming to obtain a polymer foaming foam wave absorbing material containing the wave absorbing agent;
2) And coating an adhesive among the O-state aluminum foil, the polymer foam wave-transmitting material obtained in the step and the polymer foam wave-absorbing material containing the wave-absorbing agent, and then carrying out pressure curing molding to obtain the heat-resistant foam radar wave-absorbing material.
Firstly, carrying out mould pressing on polymer powder to obtain a blank plate, then placing the blank plate into a foaming mould, and filling supercritical carbon dioxide for pressure relief foaming to obtain a polymer foaming foam wave-transmitting material;
mixing the polymer powder with a wave absorbing agent, carrying out mould pressing to obtain a blank plate, then placing the blank plate in a foaming mould, filling supercritical carbon dioxide, and carrying out pressure relief foaming to obtain the polymer foam wave absorbing material containing the wave absorbing agent.
In the present invention, the pressure of the supercritical carbon dioxide is preferably 8 to 12MPa, more preferably 9 to 11MPa, and still more preferably 10MPa.
In the present invention, the immersion time of the supercritical carbon dioxide is preferably 120 to 240min, more preferably 140 to 220min, more preferably 160 to 200min, and more preferably 180min.
In the present invention, the temperature of the supercritical carbon dioxide is preferably 260 to 300 ℃, more preferably 265 to 295 ℃, more preferably 270 to 290 ℃, more preferably 275 to 285 ℃, and more preferably 280 ℃.
In the present invention, the expansion ratio of the polymer foam is preferably 10 to 20 times, more preferably 12 to 18 times, and still more preferably 14 to 16 times.
In the present invention, the pressure after the pressure-releasing and foaming is preferably normal pressure.
Finally, coating an adhesive among the O-state aluminum foil, the polymer foam wave-transmitting material obtained in the step and the polymer foam wave-absorbing material containing the wave-absorbing agent, and then carrying out pressure curing molding to obtain the heat-resistant foam radar wave-absorbing material.
In the present invention, the pressure for the press curing molding is preferably 30 to 90KPa, more preferably 40 to 80KPa, more preferably 50 to 70KPa, and more preferably 70KPa.
In the present invention, the temperature of the press curing molding is preferably 30 to 60 ℃, more preferably 35 to 55 ℃, more preferably 40 to 50 ℃, and more preferably 45 ℃.
In the present invention, the time for the press curing molding is preferably 0.5 to 2 hours, more preferably 0.8 to 1.7 hours, more preferably 1.1 to 1.4 hours, and more preferably 1 hour.
The invention is a complete and refined integral technical scheme, further improves the structural strength, the heat resistance, the electromagnetic wave power resistance, a wider wave-absorbing frequency band and more stable wave-absorbing performance of the heat-resistant foam radar wave-absorbing material, and the preparation method of the heat-resistant foam radar wave-absorbing material can specifically comprise the following steps:
the specific process flow is as follows:
(1) preparing a wave-transmitting layer (1): firstly adding powdery polyaryletherketone into a mould to be molded into a blank plate with a certain thickness, then placing the blank plate into a foaming mould to be foamed by using supercritical carbon dioxide to prepare the polyaryletherketone with the density of 80kg/m 3 Microporous polyaryletherketone foam is then cut to a certain thickness for use.
(2) Preparing a wave-absorbing layer (2): firstly, uniformly mixing a certain proportion of wave absorbing agent and powdered polyaryletherketone by a high-speed mixer, then adding the mixture into a mould to be pressed into a blank plate with a certain thickness, then placing the blank plate into a foaming mould to be foamed by using supercritical carbon dioxide, preparing foam with the wave absorbing function, and cutting the foam into a certain thickness for later use.
(3) Compounding: and (3) coating adhesives (4) on the surfaces of two sides of the wave-absorbing foam, then respectively covering the wave-transmitting foam and the aluminum foil (3), putting the wave-transmitting foam and the aluminum foil together into a composite device, closing the composite device, and curing and molding under certain pressure to obtain the composite heat-resistant foam radar wave-absorbing material.
Referring to fig. 1, fig. 1 is a schematic diagram of a structure of a composite radar wave-absorbing material provided by the present invention.
The invention provides a composite heat-resistant foam radar wave-absorbing material and a preparation method thereof. The invention designs a composite radar wave-absorbing material which takes heat-resistant foam as a main body and is wave-transparent, wave-absorbing and shielding afterwards. The radar wave-absorbing material with the structure has the characteristics of light weight and good structural strength, and also has the advantages of wide wave-absorbing frequency band and stable wave-absorbing performance; meanwhile, the heat resistance is good, and the electromagnetic wave power resistance is good.
The heat-resistant foam radar wave-absorbing material provided by the invention is a multilayer foam radar wave-absorbing material prepared by doping different electric loss wave-absorbing agents with thermoplastic engineering plastics serving as matrix resin, adopts foam with micron-sized foam pores, and has the advantages of low dielectric constant, good matching property of the material and good stealth performance; the structural foam prepared by using the special engineering plastic as matrix resin has the advantages of light weight, self-flame retardance, good heat resistance and strong mechanical property, and can be directly used as a structural radar wave-absorbing material; the specific pore structure characteristics of the foam are further utilized, so that the electromagnetic waves can form multiple reflection and refraction in the foam, the surface absorption is changed into bulk absorption, the absorption of the electromagnetic waves is promoted, and the effective absorption of the electromagnetic waves in a wide frequency band can be realized; meanwhile, the wave absorbing agent with a specific structure such as carbon fiber and the like is used in a composite way with the foam, so that the wave absorbing material has attenuation characteristics. Electromagnetic waves are scattered by the intricate fibers so as to generate electromagnetic waves with opposite phases for cancellation, and reflection of the electromagnetic waves is reduced; in addition, the design of the combined wave-absorbing layer can be matched with different stealth requirements, and the design freedom degree is high. Specifically, wave absorbing foams with different wave absorbing effects can be formed by doping wave absorbing agents with different types and contents in matrix foam, and the wave absorbing layer is designed as required by adopting a multi-layer wave absorbing foam compounding mode; meanwhile, the wave absorbing material can be designed into a gradient wave absorbing layer, so that the wave absorbing effect of multiple frequency bands is further improved.
The preparation method provided by the invention has the advantages of simple process, easy control and contribution to realizing large-scale and continuous production.
Experimental results show that the areal density of the foam radar wave-absorbing material provided by the invention is not more than 4.5kg/m 2 The compressive strength is not lower than 0.5MPa; the weight is light, and the structural strength is good; meanwhile, the heat-resistant temperature can reach 180 ℃, and the reflection in the frequency band of 2-18GHz can reach less than-18 dB.
For further illustration of the present invention, the following will describe in detail a heat-resistant foam radar absorbing material and a preparation method thereof with reference to examples, but it should be understood that these examples are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, which are only for further illustration of the features and advantages of the present invention, but not for limitation of the claims of the present invention, and the scope of protection of the present invention is not limited to the following examples.
Example 1
(1) Preparing a wave-transparent layer: firstly adding polyaryletherketone with the mesh number of 80 meshes into a mould, carrying out mould pressing on the polyaryletherketone into a blank plate with the thickness of 8-15 mm under certain mould pressing process conditions (345 ℃, 10Mpa pressure and 45 min), and then carrying out mould pressing on the blank platePlacing the blank plate into a foaming mold, soaking in supercritical carbon dioxide at 280 deg.C under 10Mpa for 180min, releasing pressure, and foaming to obtain the final product with density of 80kg/m 3 And the microporous polyaryletherketone foam (hereinafter referred to as wave-transparent foam 1) with the foam pore diameter of less than 100um is cut into 5mm thick for later use.
(2) Preparing a wave-absorbing layer: firstly, uniformly mixing carbon black with a weight ratio of 10 3 Polyaryletherketone foam 1 with wave absorbing function (hereinafter referred to as wave absorbing foam 1) is finally cut into 30mm thick for later use.
(3) Compounding: coating 60g/m on the surfaces of two sides of the wave-absorbing foam 2 Then respectively covering 5mm wave-transparent foam 1 and 0.02mm thick aluminum foil on the adhesive, putting the two together in a composite device, closing the composite device, curing for 1h at the temperature of 45 ℃ under the pressure of 70Kpa, and then demoulding to obtain the composite heat-resistant foam radar wave-absorbing material.
The foam radar wave-absorbing material prepared in the embodiment 1 of the invention is subjected to performance detection.
The density of the wave-absorbing material is determined by adopting the test standard of GB/T6343; the compression strength is measured by using a test standard GB/T8813; the heat resistance was evaluated using the test standard GB/T8811.
The detection result shows that the density of the foam radar wave-absorbing material prepared in the embodiment 1 of the invention is 3.6kg/m 2 (ii) a The compressive strength is 0.8MPa; the heat-resisting temperature is 180 ℃; by adopting the foam radar wave-absorbing material, the reflection in the frequency band of 2-18GHz is less than-15 dB.
Example 2
(1) Preparing a wave-transparent layer: firstly adding polyaryletherketone with 80 meshes into a mould, and moulding under certain mould pressing process conditions (345 ℃, 10Mpa pressure, 45 min)Pressing to form a blank plate with the thickness of 8-15 mm, then putting the blank plate into a foaming mould, soaking the blank plate in supercritical carbon dioxide for 180min under the technological conditions of 285 ℃ and 12Mpa, and then releasing pressure and foaming to prepare the product with the density of 60kg/m 3 And the microporous polyaryletherketone foam (hereinafter referred to as wave-transmitting foam 2) with the foam pore diameter of less than 100um is finally cut into 10mm thick for later use.
(2) Preparing a wave-absorbing layer: firstly, putting a carbon nano tube with the weight ratio of 3 3 Polyaryletherketone foam 2 with wave absorbing function (hereinafter referred to as wave absorbing foam 2) is finally cut into 30mm thick for later use.
(3) Compounding: coating 60g/m on the surfaces of two sides of the wave-absorbing foam 2 2 Then respectively covering the wave-transmitting foam 2 with the thickness of 10mm and the aluminum foil with the thickness of 0.02mm on the adhesive, putting the adhesive and the aluminum foil together into a composite device, closing the composite device, curing for 1h at the temperature of 45 ℃ under the pressure of 70Kpa, and then demoulding to obtain the composite heat-resistant foam radar wave-absorbing material.
The foam radar wave-absorbing material prepared in the embodiment 2 of the invention is subjected to performance detection.
The density of the wave-absorbing material is determined by adopting the test standard of GB/T6343; the compression strength is measured by using a test standard GB/T8813; the heat resistance was evaluated using the test standard GB/T8811.
The detection result shows that the density of the foam radar wave-absorbing material prepared in the embodiment 2 of the invention is 3.8kg/m 2 (ii) a The compressive strength is 1.0MPa; the heat-resisting temperature is 180 ℃; by adopting the foam radar wave-absorbing material, the reflection in the frequency band of 2-18GHz is less than-15 dB.
Example 3
(1) Preparing a wave-transparent layer: the same as in example 2.
(2) Preparation of wave-absorbing layerPreparing: firstly, carbon fiber with the weight ratio of 15 to 85 and polyaryletherketone with the mesh number of 80 are put into a high-speed mixer to be uniformly mixed, then the mixture is added into a double-screw extruder, a blank plate with the thickness of 8 to 15mm is extruded at the temperature of 330 ℃, then the blank plate is put into a foaming mould to be soaked in supercritical carbon dioxide for 180min under the technological conditions of 285 ℃ and 10Mpa, and then pressure relief foaming is carried out, so that the density of 110kg/m is prepared 3 Polyaryletherketone foam 3 with wave absorbing function (hereinafter referred to as wave absorbing foam 3).
(3) Foam cutting: the wave-absorbing foam 1 (the wave-absorbing foam prepared in example 1), the wave-absorbing foam 2 (the wave-absorbing foam prepared in example 2) and the wave-absorbing foam 3 are respectively cut into foams with the thickness of 10mm for later use.
(4) Compounding: according to the superposition sequence of the wave-transparent foam 2, the wave-absorbing foam 1, the wave-absorbing foam 2 and the aluminum foil with the thickness of 0.02mm, 60g/m is coated on each layer 2 The adhesive and the composite heat-resistant foam radar absorbing material are placed in a composite device together, the composite device is closed, the composite device is cured for 1 hour at the temperature of 45 ℃ under the pressure of 70Kpa, and then the composite heat-resistant foam radar absorbing material is obtained after demoulding.
The foam radar wave-absorbing material prepared in the embodiment 3 of the invention is subjected to performance detection.
The density of the wave-absorbing material is determined by adopting the test standard of GB/T6343; the compression strength is measured by using the test standard GB/T8813; the heat resistance was evaluated using the test standard GB/T8811.
The detection result shows that the density of the foam radar wave-absorbing material prepared in the embodiment 3 of the invention is 4.1kg/m 2 (ii) a The compressive strength is 1.0MPa; the heat-resisting temperature is 180 ℃; by adopting the foam radar wave-absorbing material, the reflection in a frequency band of 2-18GHz is less than-18 dB.
The above detailed description of the composite heat resistant foam radar absorbing material and the preparation method thereof provided by the present invention has been provided, and the principle and embodiments of the present invention are described herein by using specific examples, which are provided only for helping to understand the method and the core idea thereof, including the best mode, and also for enabling any person skilled in the art to practice the present invention, including making and using any devices or systems and implementing any combined methods. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. The scope of the invention is defined by the claims and may include other embodiments that occur to those skilled in the art. Such other embodiments are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
Claims (10)
1. A heat-resistant foam radar wave-absorbing material is characterized by comprising a wave-transparent layer;
the wave absorbing layer is compounded on the wave transmitting layer;
the shielding layer is compounded on the wave absorbing layer;
the wave-transmitting layer is a foam wave-transmitting layer.
2. The heat-resistant foam radar wave-absorbing material as claimed in claim 1, wherein the material of the foam wave-transmitting layer comprises one or more of polyaryletherketone foam, polyphenylene sulfide foam, polyetherimide foam and polyphenylene ether foam;
the foam comprises a foam prepared by a supercritical fluid foaming method;
the density of the foam is 60-120 kg/m 3 ；
The wave-transparent layer foam is foam with a closed cell structure;
the aperture of the wave-transparent layer foam is 50-100 mu m.
3. The heat-resistant foam radar wave-absorbing material according to claim 1, wherein the wave-absorbing layer is a foam wave-absorbing layer;
the foam wave absorbing layer comprises a foam wave absorbing layer containing a wave absorbing agent;
the mass content of the wave absorbing agent in the foam is 5-15%.
4. The heat-resistant foam radar wave-absorbing material according to claim 3, wherein the wave-absorbing agent comprises a heat-resistant resistance loss type wave-absorbing agent and/or a dielectric loss type wave-absorbing agent;
the resistance loss type wave absorbing agent comprises one or more of carbon black, graphite, metal powder, silicon carbide and carbon fiber;
the dielectric loss type wave absorbing agent comprises one or more of silicon nitride, iron nitride, carbon nano tubes and graphene.
5. The heat-resistant foam radar wave-absorbing material of claim 3, wherein the wave-absorbing layer is made of one or more of polyaryletherketone foam, polyphenylene sulfide foam, polyetherimide foam and polyphenylene ether foam;
the foam comprises a foam prepared by a supercritical fluid foaming method;
the density of the foam is 60-120 kg/m 3 ；
The wave absorbing layer foam is foam with a closed pore structure;
the aperture of the wave-absorbing layer foam is 100-200 mu m.
6. The heat-resistant foam radar absorbing material according to claim 1, wherein the thickness of the wave-transparent layer is 5-12 mm;
the thickness of the wave absorbing layer is 10-30 mm;
the thickness of the shielding layer is 0.01-0.03 mm.
7. The heat-resistant foam radar absorbing material according to claim 1, wherein the shielding layer is made of an O-state aluminum foil;
the heat-resistant foam radar wave-absorbing material has a multilayer structure;
an adhesive layer is also arranged between the wave-transmitting layer and the wave-absorbing layer and/or between the wave-absorbing layer and the shielding layer;
the heat-resistant foam radar wave-absorbing material is a composite heat-resistant foam radar wave-absorbing material.
8. A preparation method of a heat-resistant foam radar wave-absorbing material is characterized by comprising the following steps:
1) Performing mould pressing on the polymer powder to obtain a blank plate, then placing the blank plate in a foaming mould, and filling supercritical carbon dioxide for pressure relief foaming to obtain a polymer foaming foam wave-transmitting material;
mixing polymer powder with a wave absorbing agent, carrying out mould pressing to obtain a blank plate, then placing the blank plate into a foaming mould, and charging supercritical carbon dioxide for pressure relief foaming to obtain a polymer foaming foam wave absorbing material containing the wave absorbing agent;
2) And coating an adhesive among the O-state aluminum foil, the polymer foam wave-transmitting material obtained in the step and the polymer foam wave-absorbing material containing the wave-absorbing agent, and then carrying out pressure curing molding to obtain the heat-resistant foam radar wave-absorbing material.
9. The method according to claim 8, wherein the pressure of the supercritical carbon dioxide is 8 to 12MPa;
the dipping time of the supercritical carbon dioxide is 120-240 min;
the temperature of the supercritical carbon dioxide is 260-300 ℃;
the foaming ratio of the polymer foam is 10-20 times.
10. The production method according to claim 8, wherein the pressure for press-curing molding is 30 to 90KPa;
the temperature for the pressure curing molding is 30-60 ℃;
the time for pressing, curing and molding is 0.5-2 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210860165.0A CN115230269A (en) | 2022-07-21 | 2022-07-21 | Composite heat-resistant foam radar wave-absorbing material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210860165.0A CN115230269A (en) | 2022-07-21 | 2022-07-21 | Composite heat-resistant foam radar wave-absorbing material and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115230269A true CN115230269A (en) | 2022-10-25 |
Family
ID=83674095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210860165.0A Pending CN115230269A (en) | 2022-07-21 | 2022-07-21 | Composite heat-resistant foam radar wave-absorbing material and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115230269A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115954682A (en) * | 2023-02-28 | 2023-04-11 | 湖南博翔新材料有限公司 | Light wave-absorbing material and application thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010031794A1 (en) * | 1999-06-07 | 2001-10-18 | Takayuki Yamamoto | Heat-resistant polymer foam, process for producing the same, and foam substrate |
| CN105196638A (en) * | 2015-09-24 | 2015-12-30 | 北京机电工程研究所 | Broadband wave-absorbing force bearing composite material and preparing method thereof |
| CN110802781A (en) * | 2019-09-27 | 2020-02-18 | 浙江瑞堂塑料科技股份有限公司 | Invisible mine shell and preparation method thereof |
| CN111633899A (en) * | 2020-05-20 | 2020-09-08 | 武汉理工大学 | Polymer-based wave-absorbing foam material and preparation method thereof |
| CN112745502A (en) * | 2020-12-29 | 2021-05-04 | 江苏中科聚合新材料产业技术研究院有限公司 | Flame-retardant wave-absorbing polyimide foam material and preparation method and application thereof |
| CN114633528A (en) * | 2022-03-22 | 2022-06-17 | 江苏万华拓谷新材料科技有限公司 | Composite material with wave-absorbing and electromagnetic shielding properties and preparation method thereof |
-
2022
- 2022-07-21 CN CN202210860165.0A patent/CN115230269A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010031794A1 (en) * | 1999-06-07 | 2001-10-18 | Takayuki Yamamoto | Heat-resistant polymer foam, process for producing the same, and foam substrate |
| CN105196638A (en) * | 2015-09-24 | 2015-12-30 | 北京机电工程研究所 | Broadband wave-absorbing force bearing composite material and preparing method thereof |
| CN110802781A (en) * | 2019-09-27 | 2020-02-18 | 浙江瑞堂塑料科技股份有限公司 | Invisible mine shell and preparation method thereof |
| CN111633899A (en) * | 2020-05-20 | 2020-09-08 | 武汉理工大学 | Polymer-based wave-absorbing foam material and preparation method thereof |
| CN112745502A (en) * | 2020-12-29 | 2021-05-04 | 江苏中科聚合新材料产业技术研究院有限公司 | Flame-retardant wave-absorbing polyimide foam material and preparation method and application thereof |
| CN114633528A (en) * | 2022-03-22 | 2022-06-17 | 江苏万华拓谷新材料科技有限公司 | Composite material with wave-absorbing and electromagnetic shielding properties and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115954682A (en) * | 2023-02-28 | 2023-04-11 | 湖南博翔新材料有限公司 | Light wave-absorbing material and application thereof |
| CN115954682B (en) * | 2023-02-28 | 2023-09-12 | 湖南博翔新材料有限公司 | Light wave-absorbing material and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108749229B (en) | Wave-absorbing composite material with sandwich structure and preparation method thereof | |
| CN111186186B (en) | Double-layer skin wave-absorbing composite material sandwich structure and preparation method thereof | |
| CN109553905B (en) | Preparation method of reinforced polymethacrylimide foam composite material | |
| CN105818453B (en) | A kind of honeycomb radar absorbing and preparation method thereof | |
| CN109664566B (en) | Light broadband wave-absorbing composite material with multilayer structure and preparation method thereof | |
| CN110920158A (en) | Resin column reinforced broadband wave-absorbing/bearing composite material and preparation method thereof | |
| Khatavkar et al. | Composite materials for supersonic aircraft radomes with ameliorated radio frequency transmission-a review | |
| CN111186201A (en) | Double-skin wave-absorbing honeycomb sandwich structure and preparation method thereof | |
| JPS59176035A (en) | Fiber composite material | |
| US3453620A (en) | Radome structural composite | |
| CN102218867B (en) | Wave-absorbing material for assorted fibre reinforced resin base sandwich structure and preparation method thereof | |
| CN109514947B (en) | Shelter cabin plate and preparation method thereof | |
| CN115230269A (en) | Composite heat-resistant foam radar wave-absorbing material and preparation method thereof | |
| CN110181897A (en) | A kind of aramid fiber paper honeycomb composite parts and preparation method thereof, application | |
| CN111216422A (en) | Foam honeycomb composite interlayer wave-absorbing material and preparation method thereof | |
| CN108274830A (en) | A kind of light-weighted wallboard of shelter and preparation method thereof with wideband function of shielding | |
| Wang et al. | Structural design and broadband radar absorbing performance of multi-layer patch using carbon black | |
| CN108819384A (en) | A kind of electromagnetism fiber absorbing material of multilayered structure and preparation method thereof | |
| CN108327153A (en) | A kind of composite material hard falling sphere radome fairing technology of preparing | |
| CN113942284B (en) | Honeycomb interlayer wave-absorbing material for improving oblique incidence wave-absorbing performance and preparation method thereof | |
| JP2016149756A (en) | Radome for aviation body and manufacturing method of the same | |
| CN114589979A (en) | Honeycomb sandwich composite material with high-speed impact resistance and wave-absorbing stealth function and preparation method thereof | |
| CN108278928B (en) | Lightweight shielding shelter wallboard with infrared stealth function and preparation method thereof | |
| CN113681942A (en) | Co-curing wave-absorbing composite material and preparation method thereof | |
| CN117002111A (en) | Layered high-temperature-resistant wave-absorbing glass cloth honeycomb core structure and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |