CN115491823B - Camouflage grass for visible light camouflage and radar wave absorption and preparation method thereof - Google Patents

Camouflage grass for visible light camouflage and radar wave absorption and preparation method thereof Download PDF

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Publication number
CN115491823B
CN115491823B CN202211208113.1A CN202211208113A CN115491823B CN 115491823 B CN115491823 B CN 115491823B CN 202211208113 A CN202211208113 A CN 202211208113A CN 115491823 B CN115491823 B CN 115491823B
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wave
absorbing
grass
camouflage
radar
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CN115491823A (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)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Artificial Filaments (AREA)

Abstract

The invention discloses a camouflage grass for visible light camouflage and radar wave absorption 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 surface of the base fabric, which is not woven with the wave-absorbing grass body; the length of the wave-absorbing grass body is 5-40 mm. The wave-absorbing grass body of the camouflage grass is twisted by the wave-absorbing fiber yarns, so that the problem that the wave-absorbing material falls off in a layering way can be effectively avoided, the wave-absorbing grass body distributed in a gradient manner can realize the full absorption of low-frequency to high-frequency radar waves, and the stealth performance is greatly improved. The camouflage grass body is used for preparing wave-absorbing fiber yarns in a screw extrusion mode, and the twisting process is utilized, so that the wave-absorbing frequency width and the wave-absorbing frequency strength of the wave-absorbing grass body can be effectively controlled by adjusting the twisting amount and the twisting parameters of the fiber yarns, and the mechanical property of the wave-absorbing grass body can be improved.

Description

Camouflage grass for visible light camouflage and radar wave absorption and preparation method thereof
Technical Field
The invention relates to camouflage grass, in particular to camouflage grass for visible light camouflage and radar wave absorption and a preparation method thereof, and belongs to the technical field of wave absorption materials.
Background
The stealth materials adopted by ground equipment, protection engineering and the like can reduce the detected rate, improve the survival rate of the ground equipment, increase the aggressiveness and obtain the most direct military benefit. For ground weaponry, mainly preventing airborne radar and hyperspectral detection, radar and visible light stealth technologies are often required. The traditional artificial camouflage grass is just grass with the appearance and color close to those of the natural world, can only camouflage by visible light, and does not have radar stealth effect. The invisible coating is sprayed on camouflage grass, but the coating has poor adhesive capability, easy abrasion and poor weather resistance, and aiming at the problems in the prior art, the novel camouflage grass capable of absorbing electromagnetic waves and the preparation method thereof are researched and designed, so that the problems in the prior art are overcome.
Disclosure of Invention
Aiming at the problems existing in the prior art, the first object of the invention is to provide a camouflage grass for visible light camouflage and radar wave absorption, wave absorption grass bodies in the camouflage grass adopt a twisting process, the wave absorption grass bodies are distributed in a gradient manner within 5-40 mm in length, the problem that wave absorption materials fall off in a layering manner is effectively avoided, and the wave absorption grass bodies distributed in a gradient manner can realize the full absorption of low-frequency to high-frequency radar waves, so that the stealth performance is greatly improved.
The second object of the present invention is to provide a method for preparing camouflage grass for visible light camouflage and radar wave absorption, which can prepare the length of wave-absorbing fiber yarn by 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 adjusting the twisting amount and twisting parameters of the fiber yarn by a twisting process. The method has simple process and is suitable for large-scale industrial production.
In order to achieve the technical aim, the invention provides a visible light camouflage and radar wave-absorbing camouflage grass, which 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 surface of the base fabric, which is not woven with the wave-absorbing grass body; the length of the wave-absorbing grass body is 5-40 mm.
Based on the synergistic effect among the components, the camouflage grass stealth performance is greatly improved, and meanwhile, the service life and the mechanical strength of the camouflage grass are also effectively improved. Compared with the traditional spraying process, the camouflage grass body is prepared by directly adopting the wave-absorbing fiber yarn, the falling layering of the camouflage material layer is effectively avoided, the wave-absorbing grass bodies with different lengths are distributed in a gradient mode, the working frequency band is effectively widened, the camouflage grass body has excellent absorption effects on low-frequency and broadband electromagnetic waves, and further, the visual camouflage effect of the camouflage grass is combined, so that the multifunctional and multi-frequency spectrum camouflage of the camouflage grass is realized.
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 yarn is double-yarn unidirectional winding or single-yarn unidirectional winding. Further preferably, when the wave-absorbing grass body is more than or equal to 15mm, the wave-absorbing fiber yarn is twisted in a double-yarn unidirectional winding mode, and when the wave-absorbing grass body is less than 15mm, the wave-absorbing fiber yarn is twisted in a single-yarn unidirectional winding mode.
The mechanical strength of the material can be greatly improved by unidirectional winding of the double tows, when the wave-absorbing grass body is longer, the radial stretching is the main stress direction, so that the wave-absorbing grass body is prevented from being broken, and the twisting is performed by adopting the unidirectional winding mode of the double tows; gaps exist between the double tows, so that electromagnetic waves are continuously reflected and absorbed in the gaps. The unidirectional winding twisting mode of the monofilament bundles can strengthen the supportability, is favorable for tight braiding, and is mainly stressed in transverse stretching when the wave-absorbing grass body is shorter, so that the wave-absorbing grass body is prevented from being torn, and the unidirectional winding mode of the monofilament bundles is adopted for twisting.
As a preferable scheme, 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.
As a preferable scheme, the condition of unidirectional winding and twisting of the monofilament bundles is as follows: the winding diameter is 0.1-0.8 mm, and the twist angle is 45-75 degrees.
As a preferable scheme, the wave-absorbing fiber yarn 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 absorber, 10-20 parts of color master batch and 10-30 parts of absorber. The raw material components of the wave-absorbing fiber yarn are strictly executed according to the proportion, the resin matrix plays a role in supporting the intensity of the wave-absorbing fiber yarn, the color master batch colors the fiber yarn, the visible light camouflage effect is achieved, the antioxidant and the ultraviolet absorbent are used for improving the ageing resistance of the grass yarn, the service life is prolonged, 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 wave-absorbing fiber yarn according to the proportion.
The wave-absorbing fiber yarn contains an absorbent to absorb electromagnetic waves, adopts color master batch to mix colors, and can be adjusted to be consistent with the background color to play a role in visible light camouflage
As a preferred embodiment, the resin matrix is at least one of PP, LLDPE and HDPE.
As a preferred embodiment, the antioxidant is tetrakis [ beta- (3.5-di-tert-butyl, 4-hydroxyphenyl) propionate ] pentaerythritol or stearyl beta- (3.5-di-tert-butyl, 4-hydroxyphenyl) propionate.
As a preferred embodiment, the ultraviolet absorber is 2-hydroxy-4-n-octoxybenzophenone or 2- (2 ' -hydroxy-3 ',5' -di-tert-phenyl) -5-chlorobenzotriazole.
As a preferred scheme, the absorbent is at least one of carbon fiber, conductive carbon black, polycrystalline iron fiber, magnetite powder and carbonyl iron powder.
As a preferable scheme, the base fabric is of a three-layer structure, the first layer is PP fabric, the second layer is high-strength carbon fiber fabric, and the third layer is glass fiber grid fabric. The base fabric is formed by compounding PP cloth, high-strength carbon fiber cloth and glass fiber grid cloth, has the characteristics of small contraction, high tensile force, no deformation, ultraviolet resistance, good ageing resistance and the like, the PP cloth is positioned between the wave-absorbing grass body and the high-strength carbon fiber cloth, can play a role of a wave-transmitting layer, and the high-strength carbon fiber cloth can play a role of a reflecting layer, so that electromagnetic wave absorption and shielding are realized, and the glass fiber grid cloth can enhance the strength of the bottom and the binding force of grass fibers.
As a preferable scheme, the back glue is at least one of styrene-butadiene latex, PU glue and aqueous acrylic latex. The back glue is used for coating the glue on the bottom of the lawn, so that the lawn has the functions of water resistance and dust resistance, and the grass body can be further fixed to prevent falling off.
The invention also provides a preparation method of the camouflage grass for visible light camouflage and radar wave absorption, which comprises the following steps: uniformly mixing raw materials comprising a resin matrix, an antioxidant, an ultraviolet absorbent, color master batches and an absorbent, and sequentially carrying out spinning, drafting, shaping and rolling to obtain wave-absorbing fiber yarns; twisting the wave-absorbing fiber filaments to obtain a wave-absorbing grass body; the wave-absorbing grass bodies are woven on the base fabric in a staggered mode, and then the wave-absorbing grass bodies are coated with back glue and dried to obtain the wave-absorbing grass.
The invention adopts an integrated preparation mode, adopts flexible materials for the whole structure, realizes the light-weight preparation of camouflage grass, has simple process and high overall stability, and is suitable for continuous production.
As a preferable scheme, the spinning mode is screw extrusion, provided that: the conditions are as follows: the temperature of the LLDPE and HDPE nozzle 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 stage is 220-290 ℃, the temperature of the second stage is 210-270 ℃, and the temperature of the blanking stage is 200-250 ℃.
The camouflage grass provided by the invention utilizes a twisting process and an integrated preparation mode, so that the problem of layering and falling of a wave-absorbing material is effectively avoided, the mechanical strength of the material is greatly improved, further, the wave-absorbing grass body is woven in a gradient manner according to the length, the broadband absorption of radar electromagnetic waves can be realized, and after the camouflage grass provided by the invention is adopted for camouflage of a unit target, the color difference between the unit target and an adjacent background is less than 2 Lxaxb; the reflectivity of the L wave band of radar camouflage 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 GHz 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 bodies in the camouflage grass provided by the invention adopt a twisting process, the lengths of the wave-absorbing grass bodies are distributed in a gradient manner within 5-40 mm, the problem that the wave-absorbing material is layered and falls off is effectively avoided, the wave-absorbing grass bodies in the 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 yarn is prepared in a screw extrusion mode, and the twisting process is utilized, so that the wave-absorbing frequency width and the wave-absorbing frequency intensity of the wave-absorbing grass body can be effectively controlled and the stress performance of the wave-absorbing grass body can be enhanced by adjusting the twisting amount and twisting parameters of the fiber yarn. The method has simple process and is suitable for large-scale industrial production.
3) According to the technical scheme provided by the invention, the base fabric is formed by compounding the PP fabric, the high-strength carbon fiber fabric and the glass fiber grid fabric, and has the characteristics of small contraction, high tensile force, no deformation, ultraviolet resistance, good ageing resistance and the like, the PP fabric is positioned between the wave-absorbing grass body and the high-strength carbon fiber fabric and can play a role of a wave-transmitting layer, the high-strength carbon fiber fabric can play a role of a reflecting layer, so that electromagnetic wave absorption and shielding are realized, and the glass fiber grid fabric can enhance the strength of the bottom and the binding force of grass fibers.
Drawings
In order to more clearly illustrate the practice of the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained from the structures shown in these drawings without inventive effort to those skilled in the art.
FIG. 1 is a schematic view of a camouflage grass structure according to the present invention;
FIG. 2 is a graph showing the radar absorption efficacy of the camouflage grass for visible light camouflage and radar absorption produced in example 1;
FIG. 3 is a graph showing the radar absorption efficacy of the camouflage grass for visible light camouflage and radar absorption produced in example 2;
fig. 4 is a graph showing radar absorption efficiency of the visible light camouflage and radar absorbing camouflage grass produced in example 3.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
The drugs/reagents used are all commercially available without specific description.
Example 1
The invention provides a visible light camouflage and radar wave-absorbing camouflage grass, which comprises wave-absorbing fiber yarns, base cloth and back glue. The wave-absorbing fiber yarn contains an absorbent to absorb electromagnetic waves, is mixed with color by adopting color master batches, and can be adjusted to be consistent with the background color to play a role in visible light camouflage. The base fabric is a part which is formed by compounding PP cloth, high-strength carbon fiber cloth and glass fiber grid cloth and is woven and fixed with grass yarns, and has the characteristics of small shrinkage, high tensile force, no deformation, ultraviolet resistance, good ageing resistance and the like. The back glue is to coat the glue on the bottom of the lawn, fix the grass filaments to prevent falling and pulling out.
The embodiment also provides a preparation method of the visible light camouflage and radar wave-absorbing camouflage grass, which comprises the following steps:
s1, weighing 100 parts of LLDPE resin, 0.5 part of tetra [ beta- (3.5-di-tert-butyl, 4-hydroxyphenyl) propionic acid ] pentaerythritol, 0.1 part of 2-hydroxy-4-n-octoxybenzophenone, 10 parts of green master batch and 10 parts of carbon fiber according to the weight ratio;
s2, blending and proportioning by using a high-speed stirrer, extruding the mixed materials through a screw rod to form filaments at high temperature, and preparing the filaments into the wave-absorbing fiber filaments through processes of drafting, shaping, twisting, rolling and the like;
s3, twisting wave-absorbing fiber yarns, weaving the wave-absorbing fiber yarns on a base fabric by using a tufting machine, wherein the tufting density is 10500, and the lengths of grass yarns are alternately woven at 5mm and 20 mm;
s4, coating styrene-butadiene latex on the back of the turf;
s5.80 ℃ drying.
The visible light camouflage and radar wave absorption camouflage grass prepared by the embodiment is suitable for jungle camouflage, and the radar camouflage efficiency is good. The average absorption energy in the frequency band of 1-18 GHz is below-20 dB.
Example 2
The invention provides a visible light camouflage and radar wave-absorbing camouflage grass, which comprises wave-absorbing fiber yarns, base cloth and back glue. The wave-absorbing fiber yarn contains an absorbent to absorb electromagnetic waves, is mixed with color by adopting color master batches, and can be adjusted to be consistent with the background color to play a role in visible light camouflage. The base fabric is a part which is formed by compounding PP cloth, high-strength carbon fiber cloth and glass fiber grid cloth and is woven and fixed with grass yarns, and has the characteristics of small shrinkage, high tensile force, no deformation, ultraviolet resistance, good ageing resistance and the like. The back glue is to coat the glue on the bottom of the lawn, fix the grass filaments to prevent falling and pulling out.
The embodiment also provides a preparation method of the visible light camouflage and radar wave-absorbing camouflage grass, which comprises the following steps:
s1, weighing 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-benzotriazole chloride, 20 parts of yellow master batch and 10 parts of polycrystalline iron fiber according to the weight ratio;
s2, blending and proportioning by using a high-speed stirrer, extruding the mixed materials through a screw rod to form filaments at high temperature, and preparing the filaments into the wave-absorbing fiber filaments through processes of drafting, shaping, twisting, rolling and the like;
s3, weaving the grass yarns on a base fabric by a tufting machine, wherein the tufting density is 10500, and the grass yarn length is alternately woven at 10mm and 40 mm;
s4, coating aqueous acrylic emulsion on the back of the turf;
s5.80 ℃ drying;
the earthy grass yarn is suitable for desert camouflage, the radar stealth efficiency is good, and the average absorption energy in the frequency band of 1-18 GHz is below-20 dB.
Example 3
The invention provides a preparation method of camouflage grass capable of camouflage by visible light and wave absorption by radar, wherein the camouflage grass comprises wave absorption fiber yarns, base cloth and back glue. The wave-absorbing fiber yarn contains an absorbent to absorb electromagnetic waves, is mixed with color by adopting color master batches, and can be adjusted to be consistent with the background color to play a role in visible light camouflage. The base fabric is a part which is formed by compounding PP cloth, high-strength carbon fiber cloth and glass fiber grid cloth and is woven and fixed with grass yarns, and has the characteristics of small shrinkage, high tensile force, no deformation, ultraviolet resistance, good ageing resistance and the like. The back glue is to coat the glue on the bottom of the lawn, fix the grass filaments to prevent falling and pulling out.
The embodiment also provides a preparation method of the camouflage grass capable of camouflage of visible light and wave absorption of radar, which comprises the following steps:
s1, weighing 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-benzotriazole chloride, 20 parts of yellow master batch, 10 parts of chopped carbon fiber and 20 parts of magnetite powder according to the weight ratio.
S2, blending and proportioning by using a high-speed stirrer, extruding the mixed materials through a screw rod to form filaments at high temperature, and preparing the filaments into the wave-absorbing fiber filaments through processes of drafting, shaping, twisting, rolling and the like;
s3, weaving the grass yarns on a base fabric by a tufting machine, wherein the tufting density is 10500, and the lengths of the grass yarns are alternately woven at 8mm and 25 mm;
s4, coating aqueous acrylic emulsion on the back of the turf;
s5.80 ℃ drying.
The earthy grass yarn is suitable for desert camouflage, the radar stealth efficiency is good, and the average absorption energy in the frequency band of 1-18 GHz is below-20 dB.
According to the invention, the camouflage grass capable of camouflage of visible light and absorption of radar wave has high-efficiency and stable absorption effect on radar wave in a wide frequency range.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims (7)

1. A camouflage grass for visible light camouflage and radar wave absorption, which 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 surface of the base fabric, which is not woven with the wave-absorbing grass body; the length of the wave-absorbing grass body is 5-40 mm, and the wave-absorbing grass bodies with different lengths are distributed in a gradient way;
the wave-absorbing grass body is formed by twisting wave-absorbing fiber yarns, and the twisting mode of the wave-absorbing fiber yarns is double-tow unidirectional winding and/or single-tow unidirectional winding;
when the wave-absorbing grass body is more than or equal to 15mm, the wave-absorbing fiber yarn is twisted in a double-yarn unidirectional winding mode, and when the wave-absorbing grass body is less than 15mm, the wave-absorbing fiber yarn is twisted in a single-yarn unidirectional winding mode;
the conditions of the unidirectional winding and twisting of the double tows 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 monofilament bundles are as follows: the winding diameter is 0.1-0.8 mm, and the twist angle is 45-75 degrees;
the wave-absorbing fiber yarn 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 absorber, 10-20 parts of color master batch and 10-30 parts of absorber.
2. A camouflage grass for visible camouflage and radar absorption according to claim 1 wherein: the resin matrix is at least one of PP, LLDPE and HDPE.
3. A camouflage grass for visible camouflage and radar absorption according to claim 1 wherein: the antioxidant is tetra [ beta- (3.5-di-tert-butyl, 4-hydroxyphenyl) propionic acid ] pentaerythritol or beta- (3.5-di-tert-butyl, 4-hydroxyphenyl) propionic acid stearyl alcohol; the ultraviolet absorbent is 2-hydroxy-4-n-octoxybenzophenone or 2- (2 ' -hydroxy-3 ',5' -di-tertiary phenyl) -5-chloridized benzotriazole.
4. A camouflage grass for visible camouflage and radar absorption according to claim 1 wherein: the absorbent is at least one of carbon fiber, conductive carbon black, polycrystalline iron fiber, magnetite powder and carbonyl iron powder.
5. A camouflage grass for visible camouflage and radar absorption 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 grid cloth; the back glue is at least one of styrene-butadiene latex, PU glue and aqueous acrylic latex.
6. A method for producing camouflage grass for visible light camouflage and radar absorbing according to any one of claims 1 to 5, comprising the steps of: uniformly mixing raw materials comprising a resin matrix, an antioxidant, an ultraviolet absorbent, color master batches and an absorbent, and sequentially carrying out spinning, drafting, shaping and rolling to obtain wave-absorbing fiber yarns; twisting the wave-absorbing fiber filaments to obtain a wave-absorbing grass body; the wave-absorbing grass bodies are woven on the base fabric in a staggered mode, and then the wave-absorbing grass bodies are coated with back glue and dried to obtain the wave-absorbing grass.
7. The method for preparing the camouflage grass for visible light camouflage and radar absorption according to claim 6, wherein the method comprises the following steps: the spinning mode is screw extrusion, and the conditions are as follows: the temperature of the LLDPE and HDPE nozzle is 190-300 ℃, 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 ℃, the temperature of the first stage is 220-290 ℃, the temperature of the second stage is 210-270 ℃, and the temperature of the blanking stage is 200-250 ℃.
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