CN110626014B - Plant stealth material and preparation method thereof - Google Patents

Plant stealth material and preparation method thereof Download PDF

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Publication number
CN110626014B
CN110626014B CN201810555392.6A CN201810555392A CN110626014B CN 110626014 B CN110626014 B CN 110626014B CN 201810555392 A CN201810555392 A CN 201810555392A CN 110626014 B CN110626014 B CN 110626014B
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loofah sponge
loofah
plant
absorbing liquid
wave
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CN201810555392.6A
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CN110626014A (en
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姜耘
夏冰晖
夏小军
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Anhui Huangyu Electromagnetic Technology Co ltd
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Anhui Huangyu Electromagnetic Technology 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/14—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a face layer formed of separate pieces of material which are juxtaposed side-by-side
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • 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
    • B32B7/08—Interconnection of layers by mechanical means
    • 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
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B9/047—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material made of fibres or filaments
    • 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
    • H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/20—All layers being fibrous or filamentary
    • 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
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/021—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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/06—Vegetal 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
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Laminated Bodies (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

The invention relates to a plant stealth material and a manufacturing method thereof, in particular to a loofah sponge stealth material and a manufacturing method thereof. The manufacturing method provided by the invention comprises the steps of screening, cutting, soaking wave absorbing liquid, drying, cutting and sewing, and has the characteristics of simple flow, convenient operation, microwave broadband stealth performance, visible light/near infrared camouflage, thermal infrared stealth function, electromagnetic shielding performance, low density, flexibility, high strength, high and low temperature resistance, environmental protection, long service life and the like.

Description

Plant stealth material and preparation method thereof
Technical Field
The invention relates to a plant stealth material and a manufacturing method thereof, in particular to a loofah sponge stealth material and a manufacturing method thereof.
Background
At present, the common camouflage/stealth material types at home and abroad mainly comprise: wave-absorbing coating, camouflage net, covering cloth, composite structural material and the like, and the materials of the types are relatively mature in technology, wide in application and have various characteristics and different application occasions, but belong to non-plant materials. In recent years, metamaterials and metamaterials have become research hotspots in the technical field of camouflage and stealth, but the technical problems of multi-spectrum camouflage and microwave broadband camouflage are not solved yet. The hyperspectral detection device can distinguish whether the ground background is a high polymer material cover (covering cloth and composite material) or a vegetation in nature. Because the flexibility, high and low temperature resistance, weather resistance and the like of natural vegetation are weak, the processability is weak, the focusing point of the camouflage stealth material is mainly on the bionic organic material, the wave-absorbing composite bionic grass disclosed in the prior art [ CN206330484U ] and the stealth material made of the bionic organic material provided by the prior art [ CN106751276A ] are used for camouflage into the natural vegetation so as to prevent the resolution effect of hyperspectral detection equipment, but the natural camouflage effect of the natural vegetation still cannot be achieved.
Disclosure of Invention
Based on the above, the problems to be solved by the invention are to realize microwave broadband stealth performance, visible light/near infrared camouflage, thermal infrared stealth, electromagnetic shielding performance and other stealth, and the invention has the characteristics of low density, good flexibility, high strength, high and low temperature resistance, easy processing, long service life and the like.
In order to achieve the above purpose, the invention adopts the following technical scheme: the plant stealth material consists of loofah sponge units and electromagnetic shielding cloth, wherein the loofah sponge units are partially immersed in wave absorbing liquid, and the loofah sponge units are distributed and fixed on the upper surface of the electromagnetic shielding cloth.
Furthermore, the loofah sponge unit can be uniformly fixed on the upper surface of the electromagnetic shielding cloth in a pasting or sewing mode. It will be appreciated by those skilled in the art that the means of attachment include, but are not limited to, attachment with a solid, liquid adhesive or mixture thereof, and the means of suturing include, but are not limited to, suturing with needle and thread or other materials.
Furthermore, the loofah sponge units are formed by cutting loofah sponge with a vascular bundle or a fiber net structure, the cut loofah sponge units are triangular prism bodies, and each triangular prism body comprises a complete fan-shaped cavity. The triangular prisms are transversely arranged, and the bottom surfaces of the triangular prisms are rectangular and can be regularly arranged and distributed on the electromagnetic shielding cloth, so that the loofah sponge units are conveniently and fixedly connected with the electromagnetic shielding cloth. The loofah sponge units are transversely arranged, namely triangular prisms are transversely arranged and distributed, the side faces of the triangular prisms are triangular, and the peaks of the triangular prisms are peaks of the plant stealth material. And forming grooves after the triangular prisms are arranged, namely, the grooves are the wave troughs of the stealth material.
Preferably, the loofah sponge units are distributed on the electromagnetic shielding cloth in a staggered mode and in a parallel mode. Furthermore, when the staggered distribution is selected, the vertical distribution is preferable, and in this case, the bottom surface of the loofah sponge unit is required to be square, and the side length of the square is equal to the side length of the side triangle.
Preferably, the loofah sponge unit is partially impregnated with the wave absorbing liquid, and the part of the loofah sponge unit is not impregnated with the wave absorbing liquid, the lower half part of the loofah sponge unit is impregnated with the wave absorbing liquid, the bottom surface of the loofah sponge unit is connected with the electromagnetic shielding cloth, and the part of the loofah sponge unit which is not impregnated with the wave absorbing liquid is the upper half part of the loofah sponge unit and faces the free space.
Furthermore, the height of the loofah sponge unit immersed with the wave absorbing liquid is 2/3 of the whole thickness of the plant stealth material, and the side height of the loofah sponge unit not immersed with the wave absorbing liquid is 1/3 of the whole thickness of the plant stealth material.
The invention also provides a preparation method of the plant stealth material, which comprises the following steps: selecting loofah with proper diameter, cutting off two ends and reserving a cylinder with a regular middle part, cutting according to the number of vascular bundles of the loofah, and cutting into strip loofah; d, drying, namely putting the loofah sponge impregnated with the wave-absorbing liquid into a drying oven for drying, and repeating the steps C and D as required; e, slitting, namely slitting the strip-shaped loofah sponge subjected to the soaking and drying as required into rectangular or square loofah sponge units; f, sewing, namely sewing the loofah sponge units on the electromagnetic shielding cloth in parallel.
The loofah sponge is a natural plant, and the molecular structure of the loofah sponge contains water molecules, so that the reconnaissance of hyperspectral satellites can be prevented; the loofah sponge is a vascular bundle and fiber net structure, has physical characteristics of diffuse scattering and interference loss after absorbing the wave-absorbing material, belongs to an electric loss material, and has good electric property consistency; the wave absorbing liquid and the camouflage paint are both made of aqueous polyurethane, and after the wave absorbing material and the camouflage paint are adsorbed by the loofah sponge, the camouflage/stealth material is not discolored and extruded to prevent slag from falling in water, so that good engineering application efficiency is ensured. The loofah sponge is cut, cut and sewn into a rectangle at the bottom and a triangle cone at the upper part to form the impedance matching interface material, so that the microwave stealth frequency band is greatly widened, and the microwave absorptivity is improved.
The manufacturing method provided by the invention has clear flow and convenient operation, and the plant stealth material manufactured by the method has the following beneficial effects of realizing microwave broadband stealth, thermal infrared stealth, optical/near infrared camouflage and electromagnetic shielding functions, and has the characteristics of low density, good flexibility, high strength, high and low temperature resistance, environmental protection and long service life. Particularly, the natural loofah sponge facing the free space and the same color spectrum can prevent the detection of an optical/near infrared detector, particularly the detection of a hyperspectral detector.
Drawings
Fig. 1 is a cross-sectional view of a stealth material according to a first embodiment, wherein reference numeral 1 is an electromagnetic shielding cloth, 2 and 2' are loofah units, 3 is a loofah unit impregnated with a wave-absorbing liquid portion, 4 is a loofah unit not impregnated with a wave-absorbing liquid portion, and 5 is a fan-shaped cavity of the loofah unit.
Fig. 2 is a side view of the stealth material in the second embodiment, the reference numeral 6 is an electromagnetic shielding cloth, the reference numeral 7 is a loofah unit distributed transversely, and the reference numeral 7' is a loofah unit distributed longitudinally.
Fig. 3 is a top view of the stealth material in the second embodiment, the reference numeral 6 is an electromagnetic shielding cloth, the reference numeral 7 is a loofah unit distributed transversely, the 7' is a loofah unit distributed longitudinally, the 3' is a loofah unit immersed in the wave-absorbing liquid portion, and the 4' loofah unit is not immersed in the wave-absorbing liquid portion.
Fig. 4 is a process flow diagram of the production of the plant stealth material.
Detailed Description
The invention is further illustrated, but not limited, by the following examples in connection with the accompanying drawings.
Embodiment one: a plant stealth material comprises a loofah sponge unit and electromagnetic shielding cloth, the structure is shown in figure 1, wherein the loofah sponge unit 2 and the loofah sponge unit 2' are distributed and fixed on the electromagnetic shielding cloth 1 in parallel in the figure, the loofah sponge unit part 3 is immersed with wave-absorbing liquid, the bottom surface is connected with the electromagnetic shielding cloth, the loofah sponge unit part 4 is not immersed with the wave-absorbing liquid and is exposed in the air, and 5 is a fan-shaped cavity of the loofah sponge unit.
As shown in fig. 4, the preparation method of this example is as follows:
screening, namely selecting loofah with a proper diameter, cutting off two ends, and reserving a cylinder with a regular middle part.
Cutting, namely cutting the loofah into strip loofah according to the number of the loofah bundles, cutting 3 loofah bundles (3 fan-shaped cavities) into 3 strips, and cutting 4 loofah bundles (4 fan-shaped cavities) into 4 strips.
Soaking wave-absorbing liquid, and injecting the wave-absorbing liquid into a stainless steel square pool (container), wherein the level of the wave-absorbing liquid is kept consistent with 1/2 of the level of the triangular strip loofah sponge. Absorbing half of the wave-absorbing liquid/retinervus Luffae fructus, and keeping the other half in natural state.
Drying, namely putting the loofah sponge impregnated with the wave-absorbing liquid into an oven at the temperature: drying for 2 hours at 80-90 ℃, repeating for multiple times, and carrying out dipping drying for multiple times if the effect is poor.
Slitting, namely slitting the strip-shaped loofah sponge after the soaking into rectangular or square loofah sponge units according to the requirements.
Sewing, namely sewing the loofah sponge units on electromagnetic shielding cloth in parallel to prepare the loofah sponge camouflage stealth material.
The loofah sponge has the fiber bundles and the fiber net, has high heat insulation efficiency and low heat transfer efficiency, can be basically consistent with the ground background heat radiation, greatly reduces the heat radiation characteristics, and has the thermal infrared stealth effect. The vascular bundles of the natural luffa can reduce the composite dielectric constant of the material and improve the electromagnetic matching performance; the fiber network structure of the natural luffa enables the material to have interference loss function and slow scattering property, and improves the electric loss efficiency.
Embodiment two:
a plant stealth material comprises a retinervus Luffae fructus unit and electromagnetic shielding cloth, the structure is shown in figure 3, wherein retinervus Luffae fructus unit 7 and retinervus Luffae fructus unit 7' are fixed on electromagnetic shielding cloth 6 in parallel, retinervus Luffae fructus unit is partially immersed with wave absorbing liquid, the bottom surface is connected with electromagnetic shielding cloth, and the top end is exposed in air.
The preparation method of the example is as follows:
screening, namely selecting loofah with a proper diameter, cutting off two ends, and reserving a cylinder with a regular middle part.
Cutting, namely cutting the loofah into strip loofah according to the number of the loofah bundles, cutting 3 loofah bundles (3 fan-shaped cavities) into 3 strips, and cutting 4 loofah bundles (4 fan-shaped cavities) into 4 strips.
Soaking wave-absorbing liquid, and injecting the wave-absorbing liquid into a stainless steel square pool (container), wherein the level of the wave-absorbing liquid is kept consistent with 2/3 of the level of the triangular strip loofah sponge. Absorbing the wave-absorbing liquid to the 2/3 height part of the loofah sponge, and keeping the other 1/3 height part in a natural state.
Drying, namely putting the loofah sponge impregnated with the wave-absorbing liquid into an oven at the temperature: drying for 2 hours at 80-90 ℃, and if the effect is poor, soaking and drying can be carried out for many times.
Cutting, namely cutting the strip-shaped loofah sponge into square loofah sponge units with the side length of a according to the length of the triangular bottom side a of the strip-shaped loofah sponge.
Sewing, and sewing retinervus Luffae fructus units (shown in figure 3) onto electromagnetic shielding cloth to obtain retinervus Luffae fructus camouflage stealth material.
On the basis of the first embodiment, the loofah sponge unit staggered arrangement method is adopted in the embodiment, the triangle and quadrangle between the loofah sponge units are staggered and combined, the combined surface of the triangle and the quadrangle faces the incident direction of the electromagnetic wave, and the structural design and the technological preparation enable the stealth material of the embodiment to have excellent matching interfaces, strong electric loss function and good microwave stealth performance consistency for the incident angles of the electromagnetic wave from different directions. This embodiment has excellent electrical properties: the reflectivity is less than or equal to-8 dB in the frequency range of 8-12 GHz; the reflectivity is less than or equal to-10 dB in the frequency range of 12-110 GHz.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims (8)

1. The plant stealth material consists of loofah sponge units and electromagnetic shielding cloth, and is characterized in that the loofah sponge units are partially immersed in wave absorbing liquid and are distributed and fixed on the upper surface of the electromagnetic shielding cloth;
the loofah sponge unit is partially immersed in the wave absorbing liquid, the part of the loofah sponge unit is not immersed in the wave absorbing liquid, the lower half part of the loofah sponge unit immersed in the wave absorbing liquid is connected with the electromagnetic shielding cloth, and the part of the loofah sponge unit which is not immersed in the wave absorbing liquid is the upper half part of the loofah sponge unit and faces the free space;
the preparation method of the plant stealth material specifically comprises the following steps:
screening, namely selecting loofah with a proper diameter, cutting off two ends, and reserving a cylinder with a regular middle part;
b, cutting the loofah sponge into strip loofah sponge according to the number of vascular bundles of the loofah sponge;
soaking the wave-absorbing liquid, wherein part of the loofah sponge absorbs the wave-absorbing liquid, and the rest part is in a natural state;
d, drying, namely putting the loofah sponge impregnated with the wave-absorbing liquid into a drying oven for drying, and repeating the steps C and D as required;
e, slitting, namely slitting the strip-shaped loofah sponge subjected to the soaking and drying as required into rectangular or square loofah sponge units;
f, sewing, namely sewing the loofah sponge units on the electromagnetic shielding cloth in parallel.
2. The plant stealth material according to claim 1, wherein the loofah sponge unit is uniformly fixed on the upper surface of the electromagnetic shielding cloth by means of pasting or sewing.
3. A plant stealth material according to claim 1 or 2, wherein the loofah sponge units are slit by means of bundles of vascular tubes or a fibrous network, the slit loofah sponge units being triangular prism bodies, each triangular prism body comprising a complete fan-shaped cavity.
4. A plant stealth material according to claim 3, wherein the loofah sponge units are distributed on the electromagnetic shielding cloth in a transverse direction, the connection surface with the electromagnetic shielding cloth is rectangular, and the loofah sponge units are distributed on the electromagnetic shielding cloth according to the rectangular size rule of the bottom surface.
5. The plant stealth material according to claim 4, wherein the retinervus luffae fructus units are staggered or parallel to each other.
6. The plant stealth material according to claim 5, wherein the loofah units are vertically distributed between the units, the bottom surface of the loofah units is square, and the side length is equal to the length of the triangle bottom side of the side surface of the loofah units.
7. The plant stealth material according to claim 1, wherein the height of the loofah sponge unit impregnated with the wave-absorbing liquid is 2/3 of the overall thickness of the plant stealth material, and the side height of the loofah sponge unit not impregnated with the wave-absorbing liquid is 1/3 of the overall thickness of the plant stealth material.
8. The plant stealth material according to claim 7, wherein the height of the loofah sponge unit impregnated with the wave-absorbing liquid is 1/2 of the overall thickness of the plant stealth material, and the side height of the loofah sponge unit not impregnated with the wave-absorbing liquid is 1/2 of the overall thickness of the plant stealth material.
CN201810555392.6A 2018-06-01 2018-06-01 Plant stealth material and preparation method thereof Active CN110626014B (en)

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CN111457236B (en) * 2020-03-21 2022-05-20 复旦大学 Full-thermal super surface presenting infrared thermal illusion and being invisible under visible light
CN112469259A (en) * 2020-11-20 2021-03-09 东北大学 Heterogeneous atom doped woody plant based electromagnetic wave absorbing material and preparation method thereof

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