CN115491823A - Visible light camouflage and radar wave absorption camouflage grass and preparation method thereof - Google Patents

Visible light camouflage and radar wave absorption camouflage grass and preparation method thereof Download PDF

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Publication number
CN115491823A
CN115491823A CN202211208113.1A CN202211208113A CN115491823A CN 115491823 A CN115491823 A CN 115491823A CN 202211208113 A CN202211208113 A CN 202211208113A CN 115491823 A CN115491823 A CN 115491823A
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Prior art keywords
absorbing
wave
camouflage
grass
radar
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CN202211208113.1A
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CN115491823B (en
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黄小忠
王武风
鲁先孝
李洁
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Hunan Boom New Materials Co ltd
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Hunan Boom New Materials Co ltd
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05C—EMBROIDERING; TUFTING
    • D05C17/00—Embroidered or tufted products; Base fabrics specially adapted for embroidered work; Inserts for producing surface irregularities in embroidered products
    • D05C17/02—Tufted products
    • D05C17/023—Tufted products characterised by the base fabric
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F1/00—General methods for the manufacture of artificial filaments or the like
    • D01F1/02—Addition of substances to the spinning solution or to the melt
    • D01F1/10—Other agents for modifying properties
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
    • D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05C—EMBROIDERING; TUFTING
    • D05C17/00—Embroidered or tufted products; Base fabrics specially adapted for embroidered work; Inserts for producing surface irregularities in embroidered products
    • D05C17/02—Tufted products
    • D05C17/026—Tufted products characterised by the tufted pile surface
    • 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
    • F41H3/02—Flexible, e.g. fabric covers, e.g. screens, nets characterised by their material or structure
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2409/00—Presence of diene rubber
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2433/00—Presence of (meth)acrylic polymer

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Artificial Filaments (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

The invention discloses visible light camouflage and radar wave absorption camouflage grass and a preparation method thereof. The camouflage grass comprises a wave-absorbing grass body, a base fabric and a back adhesive; the wave-absorbing grass body is woven on the surface of the base fabric, and the back adhesive is coated on one side of the base fabric, on which the wave-absorbing grass body is not woven; the length of the wave-absorbing grass body is 5-40 mm. The wave-absorbing grass body of the camouflage grass is formed by twisting the wave-absorbing fiber yarns, the problem that wave-absorbing materials fall off in a layered mode can be effectively solved, the wave-absorbing grass body in gradient distribution can achieve full absorption of low-frequency to high-frequency radar waves, and the stealth performance is greatly improved. The wave-absorbing fiber filaments are prepared by the camouflage grass body in a screw extrusion mode, the twisting process is utilized, the wave-absorbing bandwidth and the wave-absorbing strength of the wave-absorbing grass body can be effectively controlled by adjusting the twisting amount and twisting parameters of the fiber filaments, and the mechanical property of the wave-absorbing grass body can be improved.

Description

Visible light camouflage and radar wave absorption camouflage grass and preparation method thereof
Technical Field
The invention relates to camouflage grass, in particular to visible light camouflage and radar wave absorption camouflage grass and a preparation method thereof, and belongs to the technical field of wave absorption materials.
Background
The adoption of stealth materials in ground equipment, protection engineering and the like can reduce the detected rate, improve the survival rate of the equipment, increase the aggressivity and obtain the most direct military benefits. For ground weaponry, the radar and hyperspectral detection are mainly prevented, and radar and visible light stealth technologies are often needed. The traditional artificial camouflage grass is only grass with the appearance and color close to the natural world, can only achieve visible light camouflage, and does not have the radar stealth effect. The hidden paint is sprayed on the camouflage grass, but the paint has poor adhesive ability, is easy to wear and has poor weather resistance, and a novel camouflage grass capable of absorbing electromagnetic waves and a preparation method thereof are researched and designed aiming at the problems in the prior art, so that the problem in the prior art is very necessary to overcome.
Disclosure of Invention
Aiming at the problems in the prior art, the first purpose of the invention is to provide a camouflage grass for visible light camouflage and radar wave absorption, the wave-absorbing grass body in the camouflage grass adopts a twisting process, the length is in gradient distribution within 5-40 mm, the problem of delamination and falling of wave-absorbing materials is effectively avoided, the wave-absorbing grass body in gradient distribution can realize the full absorption of low-frequency to high-frequency radar waves, and the stealth performance is greatly improved.
The second purpose of the invention is to provide a preparation method of camouflage grass for visible light camouflage and radar wave absorption, the method can prepare the length of the wave-absorbing fiber yarns in a screw extrusion mode, and can effectively control the wave-absorbing angle of the wave-absorbing grass body and strengthen the stress performance of the wave-absorbing grass body by utilizing a twisting process and adjusting the twisting amount and twisting parameters of the fiber yarns. The method has simple process and is suitable for large-scale industrial production.
In order to realize the technical purpose, the invention provides a visible light camouflage and radar wave absorption camouflage grass, which comprises a wave absorption grass body, a base fabric and a back adhesive; the wave-absorbing grass body is woven on the surface of the base fabric, and the back adhesive is coated on one side of the base fabric, on which the wave-absorbing grass body is not woven; the length of the wave-absorbing grass body is 5-40 mm.
Based on the synergistic effect among the components, the service life and the mechanical strength of the camouflage grass are effectively prolonged while the stealth performance of the camouflage grass is greatly improved. The camouflage grass directly adopts the wave-absorbing fiber filaments to prepare the wave-absorbing grass body, compared with the traditional spraying process, the falling and layering of the stealthy material layer are effectively avoided, the wave-absorbing grass bodies with different lengths are distributed in a gradient manner, the working frequency band is effectively widened, the wave-absorbing grass body has excellent absorption effect on low-frequency and broadband electromagnetic waves, and further, the multifunctional and multi-spectrum camouflage of the camouflage grass is realized by combining the visual camouflage effect of the camouflage grass.
As a preferable scheme, the wave-absorbing grass body is formed by twisting wave-absorbing fiber filaments.
As a preferable scheme, the twisting mode of the wave-absorbing fiber filaments is double-tow unidirectional winding or single-tow unidirectional winding. Preferably, when the wave-absorbing grass body is larger than or equal to 15mm, the twisting mode of the wave-absorbing fiber filaments adopts double-tow unidirectional winding, and when the wave-absorbing grass body is smaller than 15mm, the twisting mode of the wave-absorbing fiber filaments adopts single-tow unidirectional winding.
The mechanical strength of the material can be greatly improved by the double-tow unidirectional winding, and when the wave-absorbing grass body is long, the radial stretching is the main stress direction, so that the wave-absorbing grass body is prevented from being broken, and the twisting is carried out by adopting a double-tow unidirectional winding mode; gaps are reserved between the double tows, so that electromagnetic waves are continuously reflected and absorbed in the gaps. The single-tow unidirectional winding twisting mode can strengthen the support property and is beneficial to tight weaving, when the wave-absorbing grass body is short, the transverse stretching is the main stress direction, and in order to prevent the wave-absorbing grass body from being torn, the single-tow unidirectional winding mode is adopted for twisting.
As a preferable scheme, the conditions of the double tows for unidirectional winding and twisting are as follows: the winding diameter is 0.2-1.2 mm, and the twist angle is 30-60 degrees.
As a preferable scheme, the conditions for unidirectional winding and twisting of the monofilament bundle are as follows: the winding diameter is 0.1-0.8 mm, and the twist angle is 45-75 deg.
As a preferable scheme, the wave-absorbing fiber comprises the following raw material components in percentage by mass: 100 parts of resin matrix, 0.1-0.5 part of antioxidant, 0.1-0.5 part of ultraviolet absorbent, 10-20 parts of color master batch and 10-30 parts of absorbent. The raw material components of the wave-absorbing fiber filament are strictly executed according to the proportion, the resin matrix supports the wave-absorbing fiber filament in strength, the color master batch mixes colors of the fiber filament to achieve a visible light camouflage effect, the antioxidant and the ultraviolet absorbent are used for improving the aging resistance of the grass filament and prolonging the service life, the absorbent plays an electromagnetic camouflage role aiming at electromagnetic waves, and the optimal camouflage effect can be achieved under certain mechanical strength only by executing the resin matrix in the proportion.
The wave-absorbing fiber contains an absorbent to absorb electromagnetic waves, and is color-mixed by using color master batches, so that the wave-absorbing fiber can be adjusted to be consistent with the background color to play a role of visible light camouflage
As a preferable embodiment, the resin matrix is at least one of PP, LLDPE and HDPE.
In a preferred embodiment, the antioxidant is pentaerythrityl tetrakis [ beta- (3.5-di-tert-butyl, 4-hydroxyphenyl) propionate ] or octadecyl beta- (3.5-di-tert-butyl, 4-hydroxyphenyl) propionate.
In a preferred embodiment, the ultraviolet absorber is 2-hydroxy-4-n-octoxybenzophenone or 2- (2 ' -hydroxy-3 ',5' -di-tert-phenyl) -5-chlorobenzotriazole.
In a preferred embodiment, the absorbent is at least one of carbon fiber, conductive carbon black, polycrystalline iron fiber, magnetite powder, and carbonyl iron powder.
As a preferred scheme, the base fabric is of a three-layer structure, the first layer is PP cloth, the second layer is high-strength carbon fiber cloth, and the third layer is glass fiber mesh cloth. The base fabric is formed by compounding PP cloth, high-strength carbon fiber cloth and glass fiber mesh cloth, and has the characteristics of small shrinkage, high tension, no deformation, ultraviolet resistance, good aging resistance and the like.
As a preferable scheme, the back glue is at least one of styrene-butadiene latex, PU glue and water-based acrylate latex. The gum is coated on the bottom of the lawn, so that on one hand, the function of water and dust prevention is achieved, and on the other hand, the grass body can be further fixed to prevent falling off.
The invention also provides a preparation method of the visible light camouflage and radar wave absorption camouflage grass, which comprises the following steps: uniformly mixing raw materials including a resin matrix, an antioxidant, an ultraviolet absorbent, color master batches and an absorbent, and sequentially performing spinning, drafting, sizing and rolling to obtain wave-absorbing fiber filaments; twisting the wave-absorbing fiber filaments to obtain a wave-absorbing grass body; and weaving the wave-absorbing grass bodies on the base fabric in a staggered manner, and then coating and drying the wave-absorbing grass bodies through back glue.
The invention adopts an integrated preparation mode, adopts flexible materials in the whole structure, realizes the light weight preparation of the camouflage grass, has simple process and high integral stability, and is suitable for continuous production.
As a preferred scheme, the spinning mode is screw extrusion, and the conditions are as follows: the conditions are as follows: the temperature of LLDPE and HDPE nozzles is 190-300 ℃, wherein the temperature of the first section is 230-300 ℃, the temperature of the second section is 220-290 ℃, and the temperature of the blanking section is 210-280 ℃; the temperature of the PP nozzle is 230-300 ℃, wherein the temperature of the first section is 220-290 ℃, the temperature of the second section is 210-270 ℃, and the temperature of the blanking section is 200-250 ℃.
The camouflage grass provided by the invention utilizes a twisting process and an integrated preparation mode, so that the problem that wave-absorbing materials are layered and fall off is effectively avoided, the mechanical strength of the materials is greatly improved, furthermore, wave-absorbing grass bodies are woven in a gradient manner according to the lengths, the broadband absorption of radar electromagnetic waves can be realized, and through tests, after the camouflage grass camouflage unit target provided by the invention is adopted, the color difference between the unit target and an adjacent background is less than 2L a b; the reflectivity of the radar camouflage L wave band is less than or equal to-12 dB; the reflectivity of the X wave band is less than or equal to-15 dB; the average GHz reflectivity of 1 GHz-18 is less than or equal to-20 dB.
Compared with the prior art, the invention has the beneficial effects that:
1) The wave-absorbing grass body in the camouflage grass provided by the invention adopts a twisting process, the length is in gradient distribution within 5-40 mm, the problem that wave-absorbing materials are layered and fall off is effectively avoided, the wave-absorbing grass body in gradient distribution can realize the full absorption of low-frequency to high-frequency radar waves, and the stealth performance is greatly improved.
2) According to the technical scheme provided by the invention, the wave-absorbing fiber filaments are prepared in a screw extrusion mode, and the twisting process is utilized, so that the wave-absorbing bandwidth and strength of the wave-absorbing grass body can be effectively controlled by adjusting the twisting amount and twisting parameters of the fiber filaments, and the stress performance of the wave-absorbing grass body can be enhanced. The method has simple process and is suitable for large-scale industrial production.
3) In the technical scheme provided by the invention, the base fabric is formed by compounding PP cloth, high-strength carbon fiber cloth and glass fiber mesh cloth, and has the characteristics of small shrinkage, high tension, no deformation, ultraviolet resistance, good aging resistance and the like.
Drawings
In order to more clearly illustrate the implementation of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained according to the structures shown in the drawings without creative efforts for those skilled in the art.
FIG. 1 is a schematic structural view of a camouflage grass provided by the present invention;
FIG. 2 is a radar absorption efficiency chart of the visible light camouflage and radar wave absorption camouflage grass prepared in example 1;
FIG. 3 is a radar absorption efficiency chart of the visible light camouflage and radar wave absorption camouflage grass prepared in example 2;
FIG. 4 is a radar absorption efficiency chart of the visible light camouflage and radar wave absorption camouflage grass prepared in example 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of the present invention.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The drugs/reagents used are all commercially available without specific mention.
Example 1
The invention provides visible light camouflage and radar wave absorption camouflage grass which comprises wave absorption fiber yarns, base cloth and back adhesive. The wave-absorbing fiber contains an absorbent to absorb electromagnetic waves, and color master batches are adopted for color adjustment, so that the wave-absorbing fiber can be adjusted to be consistent with the background color to play a role in visible light camouflage. The base fabric is a part for weaving and fixing the grass filaments together, is formed by compounding PP (polypropylene) cloth, high-strength carbon fiber cloth and glass fiber mesh cloth, and has the characteristics of small shrinkage, high tension, no deformation, ultraviolet resistance, good aging resistance and the like. The back glue is to coat glue on the bottom of the lawn and fix the grass filaments to prevent the grass filaments from falling off and being pulled out.
The embodiment also provides a preparation method of the visible light camouflage and radar wave absorption camouflage grass, which comprises the following steps:
s1, weighing raw materials of 100 parts of LLDPE resin, 0.5 part of tetra [ beta- (3.5-di-tert-butyl, 4-hydroxyphenyl) propionic acid ] pentaerythritol ester alcohol, 0.1 part of 2-hydroxy-4-n-octoxy benzophenone, 10 parts of green master batch and 10 parts of carbon fiber in parts by weight;
s2, blending and batching by using a high-speed stirrer, extruding the mixed material at high temperature through a screw rod to form filaments through a spinneret orifice, and preparing the microwave absorbing fiber filaments through processes of drafting, sizing, twisting, rolling and the like;
s3, twisting the wave-absorbing fiber yarns, weaving the yarns on a base fabric by using tufting machines, wherein the tufting density is 10500, and the lengths of the grass yarns are alternately woven in a mode of 5mm and 20 mm;
s4, coating styrene-butadiene latex on the back of the turf;
s drying at 5.80 ℃.
The camouflage grass capable of being disguised by visible light and absorbing waves by radar prepared by the embodiment has the advantages that green grass filaments are suitable for jungle camouflage, and the radar hiding efficiency is good. The average absorption energy in the frequency band of 1-18 GHz can reach below-20 dB.
Example 2
The invention provides visible light camouflage and radar wave absorption camouflage grass which comprises wave absorption fiber yarns, base cloth and back glue. The wave-absorbing fiber contains an absorbent to absorb electromagnetic waves, and color master batches are adopted for color adjustment, so that the wave-absorbing fiber can be adjusted to be consistent with the background color to play a role in visible light camouflage. The base fabric is a part for weaving and fixing the grass filaments together, is formed by compounding PP (polypropylene) cloth, high-strength carbon fiber cloth and glass fiber mesh cloth, and has the characteristics of small shrinkage, high tension, no deformation, ultraviolet resistance, good aging resistance and the like. The back glue is to coat glue on the bottom of the lawn to fix the grass filaments to prevent the grass filaments from falling off and being pulled out.
The embodiment also provides a preparation method of the visible light camouflage and radar wave absorption camouflage grass, which comprises the following steps:
s1, weighing raw materials according to the weight parts of 100 parts of PP resin, 0.4 part of beta- (3.5-di-tert-butyl, 4-hydroxyphenyl) octadecanol propionate, 0.3 part of 2- (2 ' -hydroxy-3 ',5' -di-tert-phenyl) -5-chlorobenzotriazole, 20 parts of yellow master batch and 10 parts of polycrystalline iron fiber;
s2, blending and batching by using a high-speed stirrer, extruding the mixed material at high temperature through a screw rod to form filaments through a spinneret orifice, and preparing the microwave absorbing fiber filaments through processes of drafting, sizing, twisting, rolling and the like;
s3, weaving the base fabric with tufting machines, wherein the tufting density is 10500, and the length of the grass filaments is alternately braided with 10mm and 40 mm;
s4, coating water-based acrylate emulsion on the back of the turf;
s, drying at 5.80 ℃;
the camouflaged grass capable of being camouflaged by visible light and absorbing radar prepared by the embodiment is suitable for desert camouflaging, lei Dayin has good body efficiency, and the average absorption energy in a frequency band of 1-18 GHz can reach below-20 dB.
Example 3
The invention provides a preparation method of camouflage grass capable of being disguised by visible light and absorbing waves by radar. The wave-absorbing fiber contains an absorbent to absorb electromagnetic waves, and color master batches are adopted for color matching, so that the wave-absorbing fiber can be adjusted to be consistent with the background color to play a role in visible light camouflage. The base fabric is a part for weaving and fixing the grass filaments together, is formed by compounding PP (polypropylene) cloth, high-strength carbon fiber cloth and glass fiber mesh cloth, and has the characteristics of small shrinkage, high tension, no deformation, ultraviolet resistance, good aging resistance and the like. The back glue is to coat glue on the bottom of the lawn and fix the grass filaments to prevent the grass filaments from falling off and being pulled out.
The embodiment also provides a preparation method of the camouflage grass capable of realizing visible light camouflage and radar wave absorption, which comprises the following steps:
s1, weighing raw materials according to the weight parts of 100 parts of PP resin, 0.4 part of beta- (3.5-di-tert-butyl, 4-hydroxyphenyl) octadecyl propionate, 0.3 part of 2- (2 ' -hydroxy-3 ',5' -di-tert-phenyl) -5-chlorobenzotriazole, 20 parts of yellow master batch, 10 parts of chopped carbon fiber and 20 parts of magnetite powder.
S2, blending and proportioning by using a high-speed stirrer, extruding the mixed materials out of spinneret orifices through a screw at a high temperature to form filaments, and preparing the microwave absorbing fiber filaments by processes of drafting, sizing, twisting, rolling and the like;
s3, weaving the base fabric with tufting machines, wherein the tufting density is 10500, and the length of the grass filaments is alternately braided with 8mm and 25 mm;
s4, coating water-based acrylate emulsion on the back of the turf;
s drying at 5.80 ℃.
The camouflaged grass capable of being camouflaged by visible light and absorbing radar prepared by the embodiment is suitable for desert camouflaging, lei Dayin has good body efficiency, and the average absorption energy in a frequency band of 1-18 GHz can reach below-20 dB.
By combining 3 embodiments, the camouflage grass capable of camouflage by visible light and absorbing radar waves has efficient and stable absorption effect on radar waves in a wide frequency band.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. The visible light camouflage and radar wave absorption camouflage grass is characterized in that: comprises a wave-absorbing grass body, a base fabric and a back adhesive; the wave-absorbing grass body is woven on the surface of the base fabric, and the back adhesive is coated on one side of the base fabric, on which the wave-absorbing grass body is not woven; the length of the wave-absorbing grass body is 5-40 mm.
2. The visible-light camouflage and radar-absorbing camouflage grass according to claim 1, wherein: the wave-absorbing grass body is formed by twisting wave-absorbing fiber yarns, and the twisting mode of the wave-absorbing fiber yarns is that double-tow unidirectional winding and/or single-tow unidirectional winding.
3. The visible-light camouflage and radar-absorbing camouflage grass according to claim 2, wherein:
the conditions of the double-tow unidirectional winding and twisting are as follows: the winding diameter is 0.2-1.2 mm, and the twist angle is 30-60 degrees;
the conditions of unidirectional winding and twisting of the single tows are as follows: the winding diameter is 0.1-0.8 mm, and the twist angle is 45-75 degrees.
4. The visible-light camouflage and radar-absorbing camouflage grass according to claim 2, wherein: the wave-absorbing fiber comprises the following raw material components in percentage by mass: 100 parts of resin matrix, 0.1-0.5 part of antioxidant, 0.1-0.5 part of ultraviolet absorbent, 10-20 parts of color master batch and 10-30 parts of absorbent.
5. The visible-light camouflage and radar-absorbing camouflage grass according to claim 4, wherein: the resin matrix is at least one of PP, LLDPE and HDPE.
6. The visible light and radar absorbing camouflage grass according to claim 4, wherein: the antioxidant is tetra [ beta- (3.5-di-tert-butyl, 4-hydroxyphenyl) propionic acid ] pentaerythritol ester alcohol or beta- (3.5-di-tert-butyl, 4-hydroxyphenyl) propionic acid octadecyl ester; the ultraviolet absorbent is 2-hydroxy-4-n-octoxybenzophenone or 2- (2 ' -hydroxy-3 ',5' -di-tert-phenyl) -5-chlorinated benzotriazole.
7. The visible-light camouflage and radar-absorbing camouflage grass according to claim 4, wherein: the absorbent is at least one of carbon fiber, conductive carbon black, polycrystalline iron fiber, magnetite powder and carbonyl iron powder.
8. The visible light and radar absorbing camouflage grass according to claim 1, wherein: the base fabric is of a three-layer structure, the first layer is PP cloth, the second layer is high-strength carbon fiber cloth, and the third layer is glass fiber mesh cloth; the back adhesive is at least one of styrene-butadiene latex, PU adhesive and water-based acrylate latex.
9. The preparation method of the visible light camouflage and radar wave absorption camouflage grass according to any one of claims 1 to 8, which is characterized by comprising the following steps: uniformly mixing raw materials including a resin matrix, an antioxidant, an ultraviolet absorbent, color master batches and an absorbent, and sequentially performing spinning, drafting, sizing and rolling to obtain the wave-absorbing fiber yarns; twisting the wave-absorbing fiber filaments to obtain a wave-absorbing grass body; and weaving the wave-absorbing grass bodies on the base fabric in a staggered manner, coating the wave-absorbing grass bodies with gum, and drying to obtain the wave-absorbing grass body.
10. The method for preparing the camouflage grass for visible light camouflage and radar wave absorption according to claim 9, wherein the method comprises the following steps: the spinning mode is screw extrusion, and the conditions are as follows: the temperature of LLDPE and HDPE nozzle is 190-300 ℃, the first section temperature is 230-300 ℃, the second section temperature is 220-290 ℃, and the blanking section temperature is 210-280 ℃. The temperature of the PP nozzle is 230-300 ℃, the temperature of the first section is 220-290 ℃, the temperature of the second section is 210-270 ℃ and the temperature of the blanking section is 200-250 ℃.
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