CN115302915B - Multifunctional ultra-wideband wave-absorbing and multi-frequency invisible profiling door and preparation method thereof - Google Patents

Multifunctional ultra-wideband wave-absorbing and multi-frequency invisible profiling door and preparation method thereof Download PDF

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Publication number
CN115302915B
CN115302915B CN202210903645.0A CN202210903645A CN115302915B CN 115302915 B CN115302915 B CN 115302915B CN 202210903645 A CN202210903645 A CN 202210903645A CN 115302915 B CN115302915 B CN 115302915B
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wave
absorbing
door
profiling
layer
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CN115302915A (en
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黄小忠
陈解放
李洁
鲁先孝
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Hunan Boom New Materials Co ltd
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Hunan Boom New Materials Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • 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
    • 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
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/0007—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality
    • B32B37/003—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality to avoid air inclusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—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 structural features of a fibrous or filamentary 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
    • 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
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/70—Door leaves
    • E06B3/72—Door leaves consisting of frame and panels, e.g. of raised panel type
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
    • E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
    • E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
    • E06B5/12—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes against air pressure, explosion, or gas
    • 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
    • B32B2255/02—Coating on the layer surface on fibrous or filamentary 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • 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
    • B32B2266/0278—Polyurethane
    • 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
    • B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/70—Door leaves
    • E06B2003/7049—Specific panel characteristics
    • E06B2003/7051—Specific panel characteristics of layered construction involving different materials

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  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses a multifunctional ultra-wideband wave-absorbing and multi-spectrum invisible profiling door and a preparation method thereof. The profiling door comprises a door plate, a door leaf, a door frame and a camouflage layer, wherein the door plate consists of a wave-absorbing profiling skin, a wave-absorbing foam core material and a reflecting layer, and the door frame consists of a wave-absorbing profiling skin, a low-frequency wave-absorbing film and a door frame keel. The profiling door adopts the cold rolled steel door frame and the composite door plate, thereby not only effectively ensuring the mechanical property of the profiling door, but also providing a certain explosion-proof and bulletproof protection. The invention also provides a preparation method of the profiling door, which adopts a split preparation method, realizes distributed management on the preparation process of each component and greatly simplifies the production process. The profiling door realizes the multi-spectrum stealth functions of visible light, infrared and ultra-wideband radar waves and the like based on the synergistic effect among the components, meets the requirements of military units on explosion prevention and bulletproof, and has wide application prospect in the field of military camouflage.

Description

Multifunctional ultra-wideband wave-absorbing and multi-frequency invisible profiling door and preparation method thereof
Technical Field
The invention discloses a multifunctional camouflage profiling door, in particular relates to a multifunctional ultra-wideband wave-absorbing and multi-frequency spectrum invisible profiling door and a preparation method thereof, and belongs to the field of engineering and equipment camouflage.
Background
The technology rapidly develops, the types of weaponry are diversified, and the weaponry can be detected by multi-frequency spectrum and multi-band detection instruments such as radar, thermal infrared, visible light, near infrared and the like on a battlefield, and the comprehensive application of multiple detection means is realized, so that the stealth material with a single frequency band is difficult to obtain further practical application. In most countries and regions, military operations can disguise equipment and important engineering, and in order to meet the requirements of national defense safety, comprehensive stealth of visible light, infrared, radar and the like must be considered to ensure the safety of the equipment and the important engineering. The existing camouflage door mainly imitates the background in appearance, mainly scatters radar waves by the surface shape, has poor low-frequency wave absorption, can only rely on infrared paint, cannot be maintained for a long time, and cannot achieve good effects in comprehensive stealth of visible light, infrared, radar and the like.
Disclosure of Invention
Aiming at the problems existing in the prior art, the first object of the invention is to provide a multifunctional ultra-wideband wave-absorbing and multi-spectrum invisible profiling door, which adopts a multi-layer overlapped arrangement of wave-absorbing foam layers and wave-absorbing material layers, effectively widens the working frequency band, greatly strengthens the absorption capacity of ultra-wideband waves based on the synergistic effect of wave-absorbing profiling skin, wave-absorbing foam core materials and reflecting layers, and further combines a camouflage layer on the surface of the profiling door, so that the profiling door has excellent infrared and visible light camouflage performance and multi-spectrum camouflage of the profiling door is realized. In addition, the profiling door main body adopts a steel keel, has excellent mechanical property and explosion-proof property, and provides explosion-proof and bulletproof protection for target units while guaranteeing the pseudo-installation effect.
The second object of the invention is to provide a preparation method of the multifunctional ultra-wideband wave-absorbing and multi-frequency invisible profiling door, in which each part adopts a split preparation mode, and finally the assembly and the camouflage layer coverage are carried out.
In order to achieve the above purpose, the invention provides a multifunctional ultra-wideband wave-absorbing and multi-frequency invisible profiling door, which comprises a door plate, a door leaf, a door frame and a camouflage layer, wherein the door plate and the door leaf are attached and nested in the door frame, and the camouflage layer completely covers the surfaces of the door plate and the door leaf; the door plate comprises a wave-absorbing profiling skin, a wave-absorbing foam core material and a reflecting layer; the wave-absorbing profiling skin, the wave-absorbing foam core material and the reflecting layer are sequentially connected from outside to inside; the door leaf comprises a door leaf layer, a door leaf frame and a door leaf keel; the door leaf layer is connected with the door leaf keel and embedded in the door leaf frame; the reflecting layer is connected with the door leaf layer; the door frame comprises a steel door frame keel, a low-frequency wave-absorbing film and a wave-absorbing profiling skin; the wave-absorbing profiling skin, the low-frequency wave-absorbing film and the doorframe keel are sequentially connected from outside to inside.
The invention greatly improves the stealth performance of the profiling door based on the synergistic effect of the components, and simultaneously effectively improves the explosion-proof and bullet-proof capacity of the profiling door. Because ultra-wideband electromagnetic waves are scanned and positioned by utilizing nanosecond-picosecond pulse signals, the invention effectively expands the working frequency band by superposing the wave-absorbing profiling skin and the wave-absorbing foam core material, has excellent absorption effect on the ultra-wideband electromagnetic waves, and further combines the visible light camouflage and the infrared camouflage of the camouflage layer, so that the profiling door realizes multi-frequency spectrum camouflage.
As a preferable scheme, the camouflage coating comprises a profiling coating, a visible light coating and an infrared coating, and the total thickness is 0.04-0.1 mm; the wave-absorbing foam core material comprises 1-6 wave-absorbing foam layers and 1-5 wave-absorbing material layers; the wave-absorbing foam layers and the wave-absorbing material layers are alternately stacked; the reflecting layer is at least one of a steel plate, an aluminum plate and a copper plate, and the thickness is 0.8-1.2 mm.
The wave-absorbing foam layer in the wave-absorbing foam core material mainly aims at low-frequency absorption, especially 1 GHz-2 GHz, the wave-absorbing material layer has extremely poor performance even no wave-absorbing effect when being singly used, the synergistic effect of different sheet resistances between the wave-absorbing material layer and the wave-absorbing foam layer is utilized to achieve ultra-wideband strong absorption, and the synergistic effect of the wave-absorbing material layer and the wave-absorbing foam layer is effectively excited by adopting an alternate superposition design mode, so that the absorption capacity of ultra-wideband electromagnetic waves is greatly improved.
As a preferable scheme, the wave-absorbing foam layer is at least one of polyurethane, polystyrene, polymethacrylimide foam and phenolic foam, and the thickness is 1 mm-8 mm.
As a preferable scheme, the wave-absorbing material layer is at least one of a resistance film, a magnetic carbon fiber film and a superconducting material film, and the thickness is 0.01 mm-0.5 mm.
As a preferable scheme, in the wave-absorbing foam layer, the thickness of the wave-absorbing foam layer of the (N+1) th layer is more than or equal to the thickness of the wave-absorbing foam layer of the (N) th layer. The low-frequency electromagnetic wave is difficult to consume because of longer wavelength and slower attenuation, and the wave-absorbing foam layer is set to be in a gradual thickening state in order to ensure the absorption effect of the low-frequency electromagnetic wave.
As a preferable scheme, the thickness of the wave-absorbing foam core material is less than or equal to 40mm, and the surface density is less than or equal to 5Kg/m 2.
As a preferable scheme, the wave-absorbing material layer consists of a resistive film and a metamaterial film, and the wave-absorbing foam layer is polyurethane.
As a preferred embodiment, the resistive film is at least one of a PE, PU and ITO conductive film.
As a preferable scheme, the wave-absorbing profiling skin is obtained by molding raw materials including flame-retardant resin, chopped glass fibers, chopped magnetic fibers, inorganic materials and phase-change materials through hand lay-up or injection molding.
As a preferred embodiment, the flame-retardant resin is a vinyl resin and/or a flame-retardant epoxy resin.
As a preferable scheme, the length of the chopped glass fibers is 5-10 mm, and the length of the chopped magnetic fibers is 1-5 mm.
As a preferred embodiment, the inorganic material is a mixture of CaO, mgO, K 2 O and SiO 2;
as a preferred scheme, the phase change material is at least one of alkanes, esters, alcohols, acids, inorganic hydrated salts and phase change microcapsules.
As a preferable scheme, the phase change temperature of the phase change material is 5-30 ℃ and the energy storage is 140-300J/g.
The wave-absorbing profiling skin mimics the color and fluctuation of the surrounding background in appearance so as to be fused with the background; the magnetic fiber in the wave-absorbing profiling skin can absorb electromagnetic waves in partial wave bands, particularly low frequency, and moreover, the wave-absorbing profiling skin can play a role in scattering electromagnetic waves by utilizing the undulating shape of the wave-absorbing profiling skin, and finally, the wave-absorbing profiling skin and the lower wave-absorbing foam layer cooperate to achieve ultra-wideband strong absorption.
As a preferable scheme, the low-frequency wave absorbing film is obtained by solidifying and molding raw materials including epoxy resin, glass fiber cloth, modified fiber felt, magnetic absorbent and carbon fiber preform.
As a preferable scheme, the thickness of the low-frequency wave-absorbing film is 2 mm-5 mm.
As a preferable scheme, the reflecting layer is made of carbon fiber reinforced thermoplastic polyurethane resin matrix composite or metal aluminum plate, and the thickness of the reflecting layer is 0.2-0.6 mm.
The low-frequency wave-absorbing film provided by the invention has a multilayer structure, wherein glass fiber cloth forms a wave-transmitting material layer, a modified fiber felt and a magnetic absorbent form a wave-absorbing material layer, carbon fiber cloth forms a reflecting material layer, and epoxy resin is used as a matrix and a binder. In the low-frequency wave-absorbing film, the wave-transmitting material layer and the wave-absorbing material layer are alternately designed, so that on one hand, the matching of ultra-wideband electromagnetic waves is improved, more electromagnetic waves are consumed in the film, the electromagnetic wave reflection is reduced, and on the other hand, the thickness of the film is reduced, and the film can be firmly covered on the surface of a door frame keel.
As a preferable scheme, the door leaf layer sequentially comprises a base plate, a fireproof door core plate, a fireproof plate and a base plate from outside to inside; the substrate is at least one of a galvanized steel sheet, an aluminum sheet and a copper sheet.
As a preferable scheme, the door leaf frame and the door leaf keel are channel steel or square steel; the door frame keel is made of cold rolled steel or stainless steel.
The invention also provides a preparation method of the multifunctional ultra-wideband wave-absorbing and multi-spectrum invisible profiling door, which comprises the following steps:
1) Uniformly stirring flame-retardant resin, chopped glass fibers, chopped magnetic fibers, inorganic materials and phase change materials, and performing hand lay-up or injection molding by a mold to obtain a wave-absorbing profiling skin;
2) The wave-absorbing foam layer and the wave-absorbing material layer are paved and then immersed in resin, and then solidified and molded to obtain a wave-absorbing foam core material;
3) Sequentially layering glass fiber cloth, modified fiber felt, a magnetic absorbent and carbon fiber cloth, and then carrying out vacuum infusion curing molding by adopting epoxy resin to obtain a low-frequency wave-absorbing film;
4) And (3) covering the wave-absorbing profiling skin, the wave-absorbing foam core material and the reflecting layer on the door leaf through bonding and/or riveting, simultaneously covering the wave-absorbing profiling skin and the low-frequency wave-absorbing film on the door frame through bonding and/or riveting, and nesting the door leaf into the door frame through bonding and/or riveting and covering the camouflage layer.
The invention adopts a split type preparation mode, the main structure is a steel structure, the strength is high, and then the composite material assembly and the camouflage layer coverage are carried out. The method has the advantages of simple process, good overall stability, high strength, excellent mechanical property and explosion-proof performance, and can completely meet the requirements of ultra-wideband wave absorption and multi-spectrum camouflage in camouflage.
As a preferable scheme, the mass ratio of the flame-retardant resin to the chopped glass fibers to the chopped magnetic fibers to the inorganic material to the phase-change material is 130-150:30-50:0.4-0.5:30-50:8-12.
The flame-retardant resin, the chopped glass fiber and the inorganic material play a role in supporting the strength of the wave-absorbing profiling skin; the phase change material is a temperature control material and has an infrared stealth effect; all the raw material components are strictly executed according to the proportion, so that the optimal camouflage effect can be achieved under the condition of guaranteeing the mechanical strength of the material.
As a preferable scheme, the curing and molding conditions of the wave-absorbing foam core material are as follows: the temperature is 40-100 ℃ and the time is 60-120 min.
As a preferable scheme, the curing and molding conditions of the low-frequency wave-absorbing film are as follows: the temperature is 80-120 ℃ and the curing time is 100-200 min.
The invention also provides a detailed preparation process of the multifunctional ultra-wideband wave-absorbing and multi-spectrum invisible profiling door, which comprises the following steps:
1) Preparation of profiling skin
And uniformly stirring the flame-retardant resin, the chopped glass fibers, the chopped magnetic fibers, the inorganic materials and the phase-change materials, and performing hand lay-up or injection molding to simulate the surrounding natural environment and undulate, wherein the thickness is 0-40 mm, thus obtaining the profiling skin.
2) Preparation of wave-absorbing foam core material
Soaking the wave-absorbing polyurethane foam and the wave-absorbing material layer in resin, alternately layering from top to bottom, bonding with the resin, and pressing at 40-100 ℃ for 60-120 min to obtain the polyurethane wave-absorbing foam core material.
3) Preparation of low-frequency wave-absorbing film
After the reinforcements of the wave-transmitting layer, the wave-absorbing material layer and the reflecting layer are paved according to the design scheme and epoxy resin is added, the low-frequency wave-absorbing film can be obtained by curing the reinforcements for 100 to 200 minutes at the temperature of 80 to 120 ℃ by adopting the processes of hand paste, ooA, vacuum pouring and the like.
4) Combination of two or more kinds of materials
The wave-absorbing profiling skin, the wave-absorbing foam core material and the reflecting layer are fixed on the door leaf in a bonding and/or riveting mode, the riveting position is arranged on the steel skeleton, the surfaces of the rivet holes are covered by the optical/infrared stealth material, and finally, the camouflage layer is integrally sprayed according to the peripheral background, so that the fusion with the background is completely achieved.
Compared with the prior art, the invention has the following beneficial technical effects:
1) In the stealthy profiling door provided by the invention, the wave-absorbing foam layer and the wave-absorbing material layer are overlapped in a multi-layer mode, so that the working frequency band is effectively widened, the absorption capacity of ultra-wideband waves is greatly enhanced based on the synergistic effect of the wave-absorbing profiling skin, the wave-absorbing foam core material and the reflecting layer, and furthermore, the camouflage layer on the surface of the profiling door is combined, so that the profiling door has excellent infrared and visible light camouflage performance, and the multi-frequency spectrum camouflage of the profiling door is realized.
2) According to the technical scheme provided by the invention, a split type preparation mode is adopted, and finally, assembly and camouflage layer coverage are carried out.
3) According to the technical scheme provided by the invention, the profiling door main body adopts the steel keels and the reinforcing ribs, has excellent mechanical properties and explosion-proof performance, provides explosion-proof and bulletproof protection for a target unit while guaranteeing the pseudo-installation effect, and has the advantages that after the invisible profiling door provided by the invention is adopted to camouflage the unit target, the color difference between the unit target and an adjacent background is less than 2L; after camouflage, the radiation temperature difference between the target and the background is maintained within +/-4 ℃ for 12 hours, the radar camouflage is 1 GHz-40 GHz, and the reflectivity is less than or equal to-20 dB;1 GHz-8 GHz, the reflectivity is less than or equal to-10 dB;8 GHz-18 GHz, the reflectivity is less than or equal to-25 dB; the reflectivity is less than or equal to-35 dB and is between 26.5GHz and 40 GHz.
Drawings
FIG. 1 is a schematic diagram of the structure of a low frequency absorbing film in embodiment 1;
1-glass fiber cloth, 2-modified fiber felt loaded with magnetic absorbent, and 3-carbon fiber cloth;
FIG. 2 is a schematic structural view of the wave-absorbing foam core material of example 1;
fig. 3 is a schematic front view of the profiling door of example 1.
Detailed Description
The following examples are intended to further illustrate the present invention, but not to limit the scope of the invention.
In the following examples: the camouflage paint is purchased from Shanghai Rong Ke special equipment limited company, the resistance film is an ITO conductive film purchased from Dongguan Boxiang optical materials limited company, and the metamaterial film is purchased from Shenzhen optical initiation innovation technology limited company.
Example 1
Step1: preparation of profiling skin
Preparing flame-retardant resin, chopped glass fiber, chopped magnetic fiber, inorganic material and phase change material according to a ratio of 140:40:0.4:40:10, uniformly stirring, manually pasting and molding by a mold, simulating the surrounding natural environment, and forming with a thickness of 0-40 mm to obtain the profiling skin;
step 2: preparation of wave-absorbing foam core material
And (3) alternately arranging the square resistances of the 2 layers of wave-absorbing polyurethane foam and the 1 layer of wave-absorbing resistor film from top to bottom, bonding by using epoxy resin, and pressing at 90 ℃ for 60min to obtain the polyurethane wave-absorbing foam core material.
Step 3: preparation of low-frequency wave-absorbing film
A release film is paved on a flat and clean platform, the glass fiber cloth of the wave-transmitting layer, the wave-absorbing material layer and the carbon fiber felt of the reflecting layer are paved, 6 glass fiber cloth layers and 4 wave-absorbing material layers are alternately paved, the square resistance value of the wave-absorbing material layer is 400 omega/≡, and the carbon fiber felt is arranged at the bottommost part. Each layer of flexible resin 480g/m 2 is coated by hand, then a release film is covered, all bubbles in the film are removed by scraping with an epoxy plate, compacted, then the film is placed in a press, a cushion block with the thickness of 2mm is arranged, and the film is cured for 120min at the temperature of 90 ℃ to obtain the low-frequency wave-absorbing film.
Step 4: preparation of steel structure integral door
The steel structure integral door is a common steel door, and the door leaf layers are a cold-rolled hot-dip galvanized steel sheet (0.8 mm), a fireproof plate (5 mm), a fireproof door core plate (50.4 mm), a fireproof plate (5 mm) and a cold-rolled hot-dip galvanized steel sheet (0.8 mm) from outside (environment) to inside (indoor) in sequence.
The door frame fossil fragments adopt domestic high-quality cold-rolled steel sheet, and the door leaf base plate adopts 0.8mm thick galvanized steel sheet, and through full-weld treatment surface concatenation gap, the door leaf fossil fragments adopt 100mm 50mm 3mm square steel reinforced structure, and the inside heat preservation flame retardant epoxy that fills of door leaf has carried out anticorrosive coating and has handled on the door surface.
Step 5 combination
The method comprises the steps of fixing a polyurethane wave-absorbing foam core material and carbon fiber reinforced polyurethane resin on a door leaf in an adhesion mode, fixing a steel structure integral door and a profiling skin together in an adhesion and riveting mode, covering the riveting position on a steel skeleton through an optical/infrared stealth material on the surface of a rivet hole, coating a 2mm low-frequency wave-absorbing film on the surface of a door frame keel, and finally carrying out integral spraying on 0.04mm optical and infrared stealth camouflage paint according to a peripheral background to completely achieve fusion with the background.
The ultra-wideband wave-absorbing and multi-spectrum camouflage profiling gate prepared by the embodiment meets the requirements of fusion of optical camouflage and background, and the color difference between a camouflage target and an adjacent background is 1.26L; after camouflage, the radiation temperature difference between the target and the background is maintained within +/-4 ℃ for 12 hours, the radar of the door panel camouflage is 1 GHz-40 GHz, and the reflectivity is-21.35 dB;1 GHz-8 GHz, the reflectivity is-11.24 dB;8 GHz-18 GHz, the reflectivity is-25.36 dB;26.5 GHz-40 GHz, the reflectivity is-37.26 dB, and the comprehensive stealth performance is excellent; the profiling door was tested to be effective against 5.8mm rifle bullet shots within a distance of 100 m.
Example 2:
The preparation method of the ultra-wideband wave-absorbing and multi-spectrum camouflage profiling door comprises the following steps:
Step1: preparation of profiling skin
Preparing flame-retardant resin, chopped glass fiber, chopped magnetic fiber, inorganic material and phase change material according to a ratio of 140:40:0.5:40:10, uniformly stirring, manually pasting and molding by a mold, simulating the surrounding natural environment, and forming with a thickness of 0-40mm to obtain the profiling skin;
step 2: preparation of wave-absorbing foam core material
Sequentially paving 3 layers of wave-absorbing polyurethane foam, 1 layer of wave-absorbing resistor film with the square resistance value of 570 omega/≡and 1 layer of metamaterial film in the following manner: 1 layer of wave-absorbing polyurethane foam 1 layer of wave-absorbing resistor film, 1 layer of wave-absorbing polyurethane foam 1 layer of metamaterial film, and finally paving 1 layer of wave-absorbing polyurethane film, bonding by using epoxy resin, and pressing at 90 ℃ for 60min to obtain the polyurethane wave-absorbing foam core material.
Step 3: preparation of low-frequency wave-absorbing film
A release film is paved on a flat and clean platform, a glass fiber cloth, a modified fiber felt loaded magnetic absorbent and a carbon fiber felt are paved, 8 layers of glass fiber cloth and 4 layers of wave-absorbing material layers are paved alternately, and finally, 1 layer of carbon fiber felt is paved, wherein the square resistance value of the wave-absorbing material layers is 450 omega/≡. Each layer of flexible resin 480g/m 2 is coated by hand, then a release film is covered, all bubbles in the film are removed by scraping with an epoxy plate, compacted, then the film is placed in a press, a cushion block with the thickness of 2.5mm is arranged, and the film is cured for 120min at the temperature of 90 ℃ to obtain the low-frequency wave-absorbing film.
Step 4: preparation of steel structure integral door
The steel structure integral door is a common steel door, and the door leaf layers are a cold-rolled hot-dip galvanized steel sheet (0.8 mm), a fireproof plate (5 mm), a fireproof door core plate (50.4 mm), a fireproof plate (5 mm) and a cold-rolled hot-dip galvanized steel sheet (0.8 mm) from outside (environment) to inside (indoor) in sequence.
The door frame fossil fragments adopt domestic high-quality cold rolled steel sheet, and the base plate adopts 0.8mm thick galvanized steel sheet, and through full-welded processing surface steel sheet concatenation gap, the skeleton adopts 100mm 50mm 3mm square steel reinforced structure, and the door leaf is inside to be filled to keep warm fire-retardant foam, and the door surface has carried out anticorrosive coating and has handled.
Step 5 combination
The polyurethane wave-absorbing foam core material is fixed on the door leaf in an adhesive mode, the steel structure integral door and the profiling skin are fixed together in an adhesive and riveting mode, the riveting position is arranged on the steel skeleton, the surface of the rivet hole is covered by the optical/infrared stealth material, the 2.5mm low-frequency wave-absorbing film is coated on the door frame keel, and finally the optical/infrared stealth camouflage paint with the thickness of 0.08mm is integrally sprayed according to the peripheral background, so that the fusion with the background is completely achieved.
The ultra-wideband wave-absorbing and multi-spectrum camouflage profiling gate prepared by the embodiment meets the requirements of fusion of optical camouflage and background, and the color difference between a camouflage target and an adjacent background is 0.89L; after camouflage, the radiation temperature difference between the target and the background is maintained within +/-4 ℃ for 12 hours, the radar of the door panel camouflage is 1 GHz-40 GHz, and the reflectivity is-23.46 dB;1 GHz-8 GHz, the reflectivity is-12.37 dB;8 GHz-18 GHz, the reflectivity is-26.27 dB;26.5 GHz-40 GHz, the reflectivity is-40.71 dB, and the comprehensive stealth performance is excellent.
Comparative example 1
Other conditions are the same as those of the embodiment 1, only the polyurethane wave-absorbing foam core material is not used, the wave-absorbing foam core material of the comparative embodiment is replaced by common heat-insulating foam, the molded door panel radar camouflage is 1 GHz-8 GHz, the reflectivity is-5.45 dB, and the low-frequency wave-absorbing performance is poorer than that of the embodiment 1.
Comparative example 2
Other conditions are the same as in example 1, except that the low-frequency wave-absorbing film is not used, the low-frequency wave-absorbing film is blank, the molded door panel radar camouflage is 1 GHz-8 GHz, the reflectivity is-8.91 dB, and the low-frequency wave-absorbing performance is deviated from that of example 1.
Comparative example 3
Other conditions are the same as those of the embodiment 1, but the phase change material is changed into blank, after solidification and molding, the ultra-wideband wave absorbing and multi-spectrum camouflage profiling door prepared by the comparison scheme maintains the radiation temperature difference between the target and the background within +/-10 ℃ after camouflage for 12 hours, and the performance is greatly different from that of the embodiment 1.
Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and those skilled in the art can make many similar changes without departing from the principles of the present invention and the scope of the claims, which are all within the scope of the present invention.

Claims (8)

1. A multifunctional ultra-wideband wave-absorbing and multi-frequency spectrum invisible profiling door is characterized in that:
The door plate is attached to the door leaf and nested in the door frame, and the camouflage layer completely covers the surfaces of the door plate and the door leaf;
The door plate comprises a wave-absorbing profiling skin, a wave-absorbing foam core material and a reflecting layer;
the wave-absorbing profiling skin, the wave-absorbing foam core material and the reflecting layer are sequentially connected from outside to inside;
the door leaf comprises a door leaf layer, a door leaf frame and a door leaf keel;
the door leaf layer is connected with the door leaf keel and embedded in the door leaf frame;
the reflecting layer is connected with the door leaf layer;
the door frame comprises a steel door frame keel, a low-frequency wave-absorbing film and a wave-absorbing profiling skin;
The wave-absorbing profiling skin, the low-frequency wave-absorbing film and the doorframe keel are sequentially connected from outside to inside;
the wave-absorbing foam core material comprises 1-6 wave-absorbing foam layers and 1-5 wave-absorbing material layers;
the wave-absorbing profiling skin is obtained by molding raw materials including flame-retardant resin, chopped glass fiber, chopped magnetic fiber, inorganic material and phase change material through mold hand paste or injection molding;
The inorganic material is a mixture of CaO, mgO, K 2 O and SiO 2;
The low-frequency wave absorbing film is obtained by solidifying and molding raw materials including epoxy resin, glass fiber cloth, modified fiber felt, a magnetic absorbent and a carbon fiber preform; the thickness of the low-frequency wave-absorbing film is 2 mm-5 mm;
The camouflage layer comprises a profiling coating, a visible light coating and an infrared coating; the wave-absorbing foam layers and the wave-absorbing material layers are alternately stacked; the reflecting layer is at least one of a steel plate, an aluminum plate and a copper plate;
The wave-absorbing foam layer is at least one of polyurethane, polystyrene, polymethacrylimide foam and phenolic foam; the wave absorbing material layer is at least one of a resistor film, a magnetic carbon fiber film and a superconducting material film.
2. The multifunctional ultra-wideband wave-absorbing and multi-spectrum invisible profiling door according to claim 1, wherein the multifunctional ultra-wideband wave-absorbing and multi-spectrum invisible profiling door is characterized in that: the total thickness of the camouflage layer is 0.04-0.1 mm; the thickness of the reflecting layer is 0.8-1.2 mm.
3. The multifunctional ultra-wideband wave-absorbing and multi-spectrum invisible profiling door according to claim 2, wherein the multifunctional ultra-wideband wave-absorbing and multi-spectrum invisible profiling door is characterized in that: the thickness of the wave-absorbing foam layer is 1 mm-8 mm; the thickness of the wave-absorbing material layer is 0.01 mm-0.5 mm.
4. The multifunctional ultra-wideband wave-absorbing and multi-spectrum invisible profiling door according to claim 1, wherein the multifunctional ultra-wideband wave-absorbing and multi-spectrum invisible profiling door is characterized in that:
the door leaf layer sequentially comprises a base plate, a fireproof door core plate, a fireproof plate and a base plate from outside to inside;
the substrate is at least one of a galvanized steel sheet, an aluminum sheet and a copper sheet.
5. The multifunctional ultra-wideband wave-absorbing and multi-spectrum invisible profiling door according to claim 1, wherein the multifunctional ultra-wideband wave-absorbing and multi-spectrum invisible profiling door is characterized in that: the door leaf frame and the door leaf keel independently select channel steel or square steel; the door frame keel is made of cold rolled steel or stainless steel.
6. The method for preparing the multifunctional ultra-wideband wave-absorbing and multi-frequency invisible profiling door according to any one of claims 1-5, which is characterized by comprising the following steps:
1) Uniformly stirring flame-retardant resin, chopped glass fibers, chopped magnetic fibers, inorganic materials and phase change materials, and performing hand lay-up or injection molding by a mold to obtain a wave-absorbing profiling skin;
2) The wave-absorbing foam layer and the wave-absorbing material layer are paved and then immersed in resin, and then solidified and molded to obtain a wave-absorbing foam core material;
3) Sequentially layering glass fiber cloth, modified fiber felt, a magnetic absorbent and carbon fiber cloth, and then carrying out vacuum infusion curing molding by adopting epoxy resin to obtain a low-frequency wave-absorbing film;
4) And (3) covering the wave-absorbing profiling skin, the wave-absorbing foam core material and the reflecting layer on the door leaf through bonding and/or riveting, simultaneously covering the wave-absorbing profiling skin and the low-frequency wave-absorbing film on the door frame through bonding and/or riveting, and nesting the door leaf into the door frame through bonding and/or riveting and covering the camouflage layer.
7. The method for preparing the multifunctional ultra-wideband wave-absorbing and multi-spectrum invisible profiling door according to claim 6, which is characterized by comprising the following steps: the mass ratio of the flame-retardant resin to the chopped glass fibers to the chopped magnetic fibers to the inorganic material to the phase change material is 130-150:30-50:0.4-0.5:30-50:8-12.
8. The method for preparing the multifunctional ultra-wideband wave-absorbing and multi-spectrum invisible profiling door according to claim 6, which is characterized by comprising the following steps:
the solidification molding conditions of the wave-absorbing foam core material are as follows: the temperature is 40-100 ℃ and the time is 60-120 min;
The curing and forming conditions of the low-frequency wave-absorbing film are as follows: the temperature is 80-120 ℃ and the curing time is 100-200 min.
CN202210903645.0A 2022-07-28 2022-07-28 Multifunctional ultra-wideband wave-absorbing and multi-frequency invisible profiling door and preparation method thereof Active CN115302915B (en)

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