Flexible composite false-indicating material and preparation method thereof

Abstract

The invention discloses a flexible composite false-indicating material and a preparation method thereof. The flexible composite false-indicating material sequentially comprises a welding layer, an optical false-indicating layer, a bearing layer, a radar reflecting layer, an infrared radiation layer and a gas barrier layer from outside to inside, wherein the infrared radiation layer comprises a heat absorption layer and two heat preservation layers, and the heat absorption layer is arranged between the two heat preservation layers. The flexible composite false-indicating material has the comprehensive effects of optical false-indicating, infrared false-indicating and radar false-indicating at the same time, the flexible composite false-indicating material is processed into an inflatable square cabin, and the appearance of the inflatable square cabin is colorful and consistent with that of a real square cabin; an infrared thermal imager is adopted to test the infrared characteristics of the target and a true target, and the display of an infrared thermogram is consistent with that of the true target; good radar detectable performance is realized; the false showing effect can be achieved without spraying camouflage paint and the like subsequently, and false target integrated forming can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of camouflage materials, and in particular to a flexible composite false indication material and a preparation method thereof. Background Art

[0002] At present, multi-band and multi-spectrum detection has become the new normal. Single-band false-detecting materials can no longer meet the current needs of camouflage. Multi-spectral false-detecting materials, especially those compatible with radar, infrared and visible light, are the inevitable trend in the development of camouflage technology. At the same time, the ever-changing use environment has also put forward higher requirements on the real-time and speed of camouflage.

[0003] Currently, real targets are made of metal materials including steel and aluminum alloy. They have strong reflection and echo signals for incident radar waves and are sprayed with camouflage coating on the outer surface to improve survivability. Therefore, false targets should have radar false indication characteristics, infrared false indication characteristics, and optical false indication characteristics.

[0004] There are two main types of decoys. One is a hard shell decoy, which is generally made of steel. Its visible light, radar, and infrared performance are highly similar to those of real targets, but the high cost and heavy weight of hard shell decoys limit their application in certain specific environments. The other is an inflatable decoy, which has the advantages of low cost, light weight, and easy deployment.

[0005] However, it was found during use that the decoy materials used for existing inflatable decoy targets cannot achieve the effects of optical, infrared, and radar multiple decoys at the same time, and the processing performance is poor. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a flexible composite false-target material, which has multiple false-target effects of optics, infrared and radar, and has light weight, outstanding mechanical properties, excellent gas barrier properties, strong machinability, and can realize the integrated processing of inflatable false targets.

[0007] A further technical problem to be solved by the present invention is to provide a method for preparing a flexible composite false indication material.

[0008] In order to achieve the above object, the present invention adopts the following technical scheme:

[0009] A flexible composite false indication material, which comprises, from the outside to the inside, a welding layer, an optical false indication layer, a load-bearing layer, a radar reflection layer, an infrared radiation layer and a gas barrier layer; wherein the infrared radiation layer comprises a heat absorption layer and two thermal insulation layers, and the heat absorption layer is arranged between the two thermal insulation layers.

[0010] Wherein, the welding layer is a polyurethane adhesive layer, and the weight of the welding layer is not less than 10 , and / or, the optical false layer has a grammage of not less than 15 .

[0011] Wherein, the gram weight of the welding layer is 10~13 , and / or, the optical false layer has a gram weight of 20 to 30 .

[0012] Wherein, the gram weight of the bearing layer is not less than 90 , the breaking strength is not less than 240N / cm; and / or the gram weight of the radar reflection layer is not less than 30 The radar reflection layer is a solvent-based polyurethane filled with highly conductive metal powder, wherein the mass of the highly conductive metal powder accounts for more than 60% of the total mass of the radar reflection layer.

[0013] Wherein, the weight of the bearing layer is 100~110 , and / or, the radar reflection layer has a gram weight of 30 to 40 .

[0014] Wherein, the infrared radiation layer has a gram weight of not less than 80 , and / or, the gas barrier layer has a gram weight of not less than 20 .

[0015] Wherein, the infrared radiation layer has a gram weight of 80-90 , and / or, the gas barrier layer has a gram weight of 25 to 30 .

[0016] Wherein, the weight of the heat absorbing layer in the infrared radiation layer is not less than 50 The weight of each insulation layer is not less than 15 .

[0017] The method for preparing the above-mentioned flexible composite false-indicating material comprises the following steps:

[0018] Composite the radar reflection layer on the bearing layer to obtain a first composite body;

[0019] Compounding the infrared radiation layer on one side of the radar reflection layer of the first composite body to obtain a second composite body;

[0020] Compounding a gas barrier layer on one side of the infrared radiation layer of the second composite to obtain a third composite;

[0021] Compounding an optical pseudo-layer on one side of the bearing layer of the third composite body to obtain a fourth composite body;

[0022] The flexible composite false indication material can be obtained by compounding a welding layer on one side of the optical false indication layer of the fourth composite body.

[0023] The preparation method of the infrared radiation layer comprises the following steps: melt-extrude polyurethane masterbatch doped with carbon-based conductive material to obtain a heat absorption layer, and then compound the heat-insulating layer on both sides of the polyurethane film filled with carbon-based conductive material.

[0024] The beneficial effects of the flexible composite false indication material of the present invention are as follows:

[0025] (1) The flexible composite false indication material of the present invention has the comprehensive effects of optical false indication, infrared false indication and radar false indication. The flexible composite false indication material of the present invention is processed into an inflatable cabin, and the camouflage color of the appearance is consistent with that of a real cabin. An infrared thermal imager is used to test the infrared characteristics of the cabin and the real target, and the infrared thermal image is consistent with the real target. The RCS (radar cross section) value of the simulation calculation model is calculated using CTS software, and it is calculated that in the commonly used radar X-band, the maximum value of RCS (radar cross section) can reach 3.2dbsm, which is easy to be observed by radar and has good radar detectability. There is no need to achieve the false indication effect by spraying camouflage paint or the like, and the fake target can be integrated into one.

[0026] (2) The flexible composite false indicator material of the present invention has a welding layer and has strong processing adaptability. It adopts a high-frequency heat sealing machine to heat and pressurize the welding. The processing parameters are 140°C and 8s. The peel strength is tested to reach 22.8N / cm. The false target can be processed through heat sealing, welding, gluing and other processes.

[0027] (3) The flexible composite false indication material of the present invention has fabric as the base material, is light in weight, and is convenient for transportation and deployment; it has a load-bearing layer, has excellent mechanical properties, and is not easily damaged; it has a gas barrier layer, has good gas barrier properties, and can be used continuously for more than 10 days after being inflated once, without the need for a blower for continuous inflation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of the flexible composite false material of the present invention.

[0029] Figure 2 It is a schematic diagram of the optical camouflage test results of the flexible composite false-indicating material of the present invention.

[0030] Figure 3 It is a schematic diagram of infrared camouflage test results of the flexible composite false-detecting material of the present invention.

[0031] Figure 4 It is a schematic diagram of radar camouflage test results of the flexible composite false-indicating material of the present invention.

[0032] Figure 5 It is a schematic diagram of a processing performance test sample of the flexible composite pseudo material of the present invention.

[0033] Figure 6 It is a schematic diagram of the test process of the processing performance test of the flexible composite false material of the present invention.

[0034] Among them, the figure markings are: 1-first welding layer, 2-optical indication layer, 3-load-bearing layer, 4-radar reflection layer, 5-infrared radiation layer, 6-gas barrier layer; 51-heat absorption layer, 52, 53-thermal insulation layer, 101-upper clamp, 102-lower clamp, 201-unheat-sealed part. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] A flexible composite false indication material comprises, from outside to inside, a welding layer, an optical false indication layer, a load-bearing layer, a radar reflection layer, an infrared radiation layer and a gas barrier layer; wherein the infrared radiation layer comprises a heat absorption layer and two thermal insulation layers, and the heat absorption layer is arranged between the two thermal insulation layers.

[0037] The optical false indication layer is equivalent to the camouflage coating of the real target, and its main function is to be used for optical camouflage, concealment or misleading the target detection system; the load-bearing layer mainly bears the mechanical properties of the flexible composite material and ensures the required strength of the flexible composite material; the main function of the radar reflection layer is to reflect radar waves, making it difficult for the radar to identify the real target, thereby protecting the real target from radar reconnaissance and attack; the main function of the infrared radiation layer is to simulate the infrared characteristics of the target and make the infrared detection equipment ineffective; the main function of the gas barrier layer is to prevent the gas leakage in the inflated false target and improve its airtightness; the welding layer is mainly to facilitate the subsequent processing of the inflated false target and improve the performance of the material. Preferably, the overall gram weight of the flexible composite false indication material of the present invention is not more than 350 .

[0038] Furthermore, the load-bearing layer is a fabric layer, which is generally a high-strength nylon fabric or a high-strength polyester fabric, with a gram weight of 100-110 The breaking strength is above 240N / cm.

[0039] Furthermore, the optical false indication layer is realized by digitally printing and dyeing a camouflage pattern on the front side of the bearing layer fabric, and then performing post-finishing to ensure that the pattern is durable and does not fade. The weight of the optical false indication layer is 20-30 grams. In the prior art, the optical deception of inflatable deception targets is usually to complete the processing of the deception camouflage, inflate it and spray or brush the surface with camouflage paint, which is inconvenient to operate and process, and takes a long time. The present invention adopts the method of digital printing and dyeing for integrated molding, which is convenient to use.

[0040] Furthermore, the welding layer is a polyurethane adhesive layer, and the weight is generally 10 about.

[0041] Furthermore, the radar reflection layer is a solvent-based polyurethane filled with highly conductive metal powder, wherein the mass of the highly conductive metal powder accounts for more than 60% of the total mass of the radar reflection layer, and the gram weight of the radar reflection layer is between 30 and 40 grams. The main method for simulating radar characteristics in the prior art is to use a built-in metal mesh or reflective cloth. The present invention uses polyurethane filled with highly conductive metal powder to form a radar reflection layer, which increases the adhesion between the radar reflection layer and the load-bearing layer on the one hand, and reduces the weight on the other hand, making it more suitable for inflatable false targets.

[0042] Furthermore, the infrared radiation layer is composed of a heat absorbing layer and two heat-insulating layers, the heat absorbing layer is located between the two heat-insulating layers to form a sandwich structure, and the infrared radiation layer has a gram weight of 80-90 . Currently, the main method for simulating infrared characteristics of inflatable fake targets is the resistance wire heating method, that is, the electric heating coating material is applied to the surface of the base cloth, and the temperature of the fake target is raised by the resistance wire heating to make it higher than the ambient temperature, so as to achieve the effect of infrared false indication. The present invention adopts a sandwich structure composed of a thermal insulation layer and a heat absorption layer as the infrared radiation layer, and carbon-based conductive materials such as graphene are added to the heat absorption layer to absorb heat, thereby achieving the purpose of infrared false indication. In addition, polyurethane is used as the main material of the heat absorption layer and the thermal insulation layer, which is conducive to the combination of the infrared radiation layer and the load-bearing layer.

[0043] Furthermore, the heat absorption layer is formed by melt extrusion of polyurethane masterbatch doped with one or more carbon-based conductive materials such as graphene, carbon nanotubes, and conductive carbon black. The weight of the heat absorption layer film is generally 50 The weight percentage of the carbon-based conductive material in the heat absorption layer is 3% to 5%.

[0044] Furthermore, the thermal insulation layer is one or more of a foamed polyurethane layer, an aerogel film, and a titanium dioxide coating.

[0045] Furthermore, the gas barrier layer is one of PA film, PET film and EVOH film, and the gram weight of the gas barrier layer is 25-30 .

[0046] The method for preparing the flexible composite false-indicating material of the present invention comprises the following steps:

[0047] The radar reflection layer is compounded on the bearing layer to obtain a first composite body; specifically, a high conductive metal powder, a polyurethane dispersion, a curing agent, etc. are stirred in a certain ratio, uniformly mixed, and then coated on the inner surface of the bearing layer, and then dried at a drying temperature of 140 to 150° C.;

[0048] Compounding the infrared radiation layer on the outer surface of the radar reflection layer of the first composite body by heating and pressurizing to obtain a second composite body;

[0049] The gas barrier layer is compounded on one side of the infrared radiation layer of the second composite to obtain a third composite; specifically, firstly, an adhesive is coated on the outer surface of the infrared radiation layer, and then the gas barrier film is compounded on the infrared radiation layer by heating and pressurizing after drying (drying temperature is 110-120°C);

[0050] Compounding an optical false indication layer on one side of the bearing layer of the third composite body to obtain a fourth composite body; specifically, the optical false indication layer is achieved by printing and dyeing a corresponding pattern on the outer surface of the bearing layer and then finishing and qualitatively arranging;

[0051] The flexible composite false indication material can be obtained by composite welding layer on one side of the optical false indication layer of the fourth composite body; specifically, a polyurethane adhesive is coated on the outer surface of the optical false indication layer by a coater as a welding layer, which is then pulled by a tension roller and dried (the drying temperature is 140-150°C).

[0052] Furthermore, the preparation method of the infrared radiation layer includes the following steps: melt-extrude the polyurethane masterbatch doped with carbon-based conductive materials such as graphene, carbon nanotubes, and conductive carbon black to obtain a graphene-filled polyurethane film as a heat absorption layer, and then composite two thermal insulation layers on both sides of the heat absorption layer.

[0053] The raw materials used in the examples of the present application are all commercially available and have no special requirements unless otherwise specified.

[0054] Embodiment 1

[0055] See also Figure 1 The flexible composite false indication material of this embodiment includes, from the outside to the inside, a first welding layer 1, an optical false indication layer 2, a load-bearing layer 3, a radar reflection layer 4, an infrared radiation layer 5 and a gas barrier layer 6; wherein the infrared radiation layer includes a heat absorption layer 51 and two thermal insulation layers 52 and 53, and the heat absorption layer 51 is arranged between the two thermal insulation layers.

[0056] The method for preparing the flexible composite false-indicating material of this embodiment comprises the following steps:

[0057] (1) The radar reflection layer is compounded on the bearing layer to obtain a first composite body; wherein the first composite body is a composite of the bearing layer and the radar reflection layer. In this embodiment, the bearing layer has a gram weight of 103 Nylon Oxford cloth (purchased from Suzhou Longxinglong Weaving and Finishing Co., Ltd.).

[0058] (2) 36 kg of copper powder (purchased from Kete New Material Technology Co., Ltd.), 15 kg of polyurethane dispersion (purchased from Zhejiang Zhongke Henry New Material Co., Ltd.), and 225 g of curing agent (used in combination with polyurethane dispersion; purchased from Zhejiang Zhongke Henry New Material Co., Ltd.) were stirred for 1 h under a mechanical stirrer. After mixing evenly, the mixed solution was coated on a surface with a weight of 103 The inner surface of the nylon Oxford cloth is dried in an oven at a temperature of 140-150°C, and the radar reflection layer has a gram weight of 40 ;

[0059] (3) Compounding the infrared radiation layer on the outer surface of the radar reflection layer of the first composite body to obtain a second composite body; the second composite body is a composite of a bearing layer, radar reflection, and infrared radiation.

[0060] The infrared radiation layer film is coated on the outer surface of the radar reflection layer by a dry laminating machine through heating and pressurization. The temperature of the rubber roller is 120~130℃ and the pressure is 2~2.2mpa.

[0061] The preparation method of the infrared radiation layer is as follows: 20 kg of polyurethane masterbatch (Zhejiang Huafeng Thermoplastic Polyurethane Co., Ltd.) filled with graphene (purchased from Suzhou Qibian New Material Technology Co., Ltd.) is melt-extruded through a small extrusion coating machine to obtain a polyurethane film filled with graphene to obtain a heat absorption layer. The weight of the heat absorption layer is 50 Then the polyurethane foam film (purchased from Dongguan Zehao Polyurethane Co., Ltd.) is used as the insulation layer, and the three-layer sandwich infrared radiation layer of polyurethane foam film-graphene-filled polyurethane film-polyurethane foam film is realized through a dry laminating machine, and rolled up for use, wherein the infrared radiation layer has a gram weight of 80~90 ; The filling ratio of graphene in the polyurethane masterbatch of this embodiment is 5%.

[0062] (4) Compounding a gas barrier layer on one side of the infrared radiation layer of the second composite body to obtain a third composite body; the third composite body is a composite of a load-bearing layer-radar reflection layer-infrared radiation layer-gas barrier layer.

[0063] First, a coating machine is used to coat the outer surface of the infrared radiation layer with 10 The polyurethane adhesive is dried by a drying device (drying temperature 110-120°C) and then transferred to a dry laminating machine for heating and pressurization to achieve lamination with a PET gas barrier film (purchased from Suzhou Jiateng Packaging Materials Co., Ltd.), wherein the PET gas barrier film has a gram weight of 25-30 ;

[0064] (5) Compounding an optical false-indicating layer on one side of the load-bearing layer of the third composite body to obtain a fourth composite body; compounding the optical false-indicating layer is achieved by printing and dyeing.

[0065] Using a digital jet printing machine, the pre-set camouflage pattern is input into the computer, and the camouflage pattern is printed on the outer surface of the bearing layer nylon Oxford cloth (bearing layer), and then the pattern is fixed by heat setting to prevent fading;

[0066] (6) Processing of welding layer

[0067] The outer surface of the fourth composite body (the side of the optical false layer) after the above four steps is coated with 15 The polyurethane adhesive is used as the welding layer, which is pulled by a tension roller and rolled up in an oven. The drying temperature is 140-150°C. The weight of the welding layer after drying is 10-13 , to facilitate subsequent heat welding or gluing processing.

[0068] The performance test results are as follows:

[0069] (1) Camouflage performance test:

[0070] The flexible composite camouflage material of this embodiment was processed into an inflatable square cabin with a size of 6.4m (length)×2.m (width)×2.1m (height) to carry out a camouflage performance test.

[0071] Optical camouflage test:

[0072] Test method: Compare the appearance of the finished inflatable shelter with the real movable shelter, and observe with the naked eye whether their appearances are consistent.

[0073] Test results: See Figure 2 Through visual observation, the appearance of the inflatable cabin made by using the fake-disguising composite material of the present invention is basically consistent with the appearance of the real movable cabin, and has a good optical camouflage effect.

[0074] (2) Infrared camouflage test:

[0075] Test method: Place the completed inflatable cabin outdoors from 8:30 to 16:30 on July 12, 2024. The weather is sunny and the outdoor ambient temperature is 38°C. Use an infrared thermal imager to test its infrared characteristics and compare them with the infrared characteristics of the real cabin.

[0076] Test results see Figure 3 The surface temperature of the inflatable cabin is basically consistent with the surface temperature of the real cabin in different time periods, and the infrared camouflage effect is good.

[0077] (3) Radar camouflage test:

[0078] Test method: Use CST software to simulate and calculate the RCS (radar cross section) of the model. The plane wave incident angles are theta=0, phi=0, and the electric field polarization direction is the x-axis direction. Calculate the RCS (radar cross section) value in the X-band commonly used by radar.

[0079] Test results see Figure 4 : The maximum RCS (radar cross section) can reach 3.2dbsm, which is easily observed by radar and has good radar detectability.

[0080] (4) Processing performance test:

[0081] The main purpose is to test the peel strength of the pseudo-flexible composite material after heat sealing.

[0082] Test method: (Test standard refers to "GB 8808-88 Peeling test method for soft composite plastic materials")

[0083] The simulated flexible composite material of the present invention is cut into two samples with a size of 170 mm (length) × 150 mm (width). The front and back sides of the two samples are heated and pressurized and welded by a high-frequency heat sealing machine. The processing parameters are 140°C, 8s, and the welding width is 3 cm.

[0084] like Figure 5 As shown, the heat-sealed sample is cut into 5 samples with a width of 25±0.1mm and a length of 200mm along the vertical direction of the heat-sealing.

[0085] like Figure 6 As shown, the two ends of the unsealed part 201 of the sample are clamped on the upper clamp 101 and the lower clamp 102 of the tensile testing machine respectively, so that the longitudinal axis of the unsealed part 201 of the sample coincides with the center line of the upper and lower clamps, and the tightness is appropriate. During the test, the unsealed part 201 is T-shaped with the tensile direction; after the sample is clamped, the test is started, and the peeling failure phenomenon and peeling strength data are recorded.

[0086] Test results: The average peel strength of 5 samples is 13.3N / cm.

[0087] Comparative Example

[0088] The flexible composite false indication material of this embodiment includes, from outside to inside, a first welding layer, an optical false indication layer, a bearing layer, a radar reflection layer, an infrared radiation layer, a gas barrier layer, and a second welding layer; different from the first embodiment, the present comparative example also has a welding layer disposed on the inner side of the gas barrier layer. The preparation method is basically the same as the first embodiment, except that the last welding layer compounding step is to compound the welding layer on both sides at the same time.

[0089] The materials of the comparative example were tested using the same processing performance test method, and the test results obtained showed that the average peel strength of 5 samples was 9.1 N / cm.

[0090] Embodiment 2

[0091] (1) The radar reflection layer is compounded on the bearing layer to obtain a first composite body; wherein the first composite body is a composite of the bearing layer and the radar reflection layer. In this embodiment, the bearing layer has a gram weight of 110 High-strength polyester cloth.

[0092] 23kg of silver-coated copper powder with 15% silver content (purchased from Kete New Material Technology Co., Ltd.), 15kg of polyurethane dispersion, and 225g of curing agent were stirred for 0.9h under a mechanical stirrer. After mixing evenly, the mixed solution was coated on a 110 gram weight surface by a coating machine. The inner surface of the high-strength polyester cloth is dried in an oven at a temperature of 140-150°C, and the radar reflection layer has a gram weight of 33 ;

[0093] (2) Compounding the infrared radiation layer on the outer surface of the radar reflection layer of the first composite body to obtain a second composite body; the second composite body is a composite of a bearing layer, radar reflection, and infrared radiation.

[0094] (3) Using a dry laminating machine to coat the infrared radiation layer film on the outer surface of the radar reflection layer by heating and pressurizing, the rubber roller temperature is 120~130℃, and the pressure is 2~2.2mpa;

[0095] The preparation method of the infrared radiation layer is as follows: 20 kg of polyurethane masterbatch filled with carbon nanotubes (purchased from Suzhou Qibiao New Material Technology Co., Ltd.) is melt-extruded through a small extrusion coating machine to form a polyurethane film filled with carbon nanotubes to obtain a heat absorption layer. The weight of the heat absorption layer is 44 Then the polyurethane foam film is used as the insulation layer, and the three-layer sandwich infrared radiation layer of polyurethane foam film-carbon nanotube-filled polyurethane film-polyurethane foam film is realized by a dry laminating machine, and rolled up for use, wherein the infrared radiation layer has a gram weight of 80~90 ; The content of carbon nanotubes in this embodiment is 3%.

[0096] (4) Compounding a gas barrier layer on one side of the infrared radiation layer of the second composite body to obtain a third composite body; the third composite body is a composite of a load-bearing layer-radar reflection layer-infrared radiation layer-gas barrier layer.

[0097] First, a coating machine is used to coat the outer surface of the infrared radiation layer with 13 The polyurethane adhesive was dried by a drying device (drying temperature 110-120°C) and then transferred to a dry laminating machine for heating and pressurization to achieve lamination with a PA gas barrier film (purchased from Wenzhou Qisheng Packaging Materials Co., Ltd.), wherein the gram weight of the PA gas barrier film is 23-27 ;

[0098] (5) Compounding an optical false-indicating layer on one side of the load-bearing layer of the third composite body to obtain a fourth composite body; compounding the optical false-indicating layer is achieved by printing and dyeing.

[0099] Using a digital jet printing machine, the pre-set camouflage pattern is input into the computer, and the camouflage pattern is printed on the outer surface of the high-strength polyester fabric (bearing layer), and then the pattern is fixed through heat setting treatment to prevent fading;

[0100] (6) Processing of welding layer

[0101] The outer surface of the fourth composite body (the side of the optical false layer) after the above four steps is coated with 20 The polyurethane adhesive is used as the welding layer, which is pulled by a tension roller and rolled up in an oven. The drying temperature is 140-150°C. The weight of the welding layer after drying is 15-17 , to facilitate subsequent heat welding or gluing processing.

[0102] The performance test results are as follows:

[0103] (1) Tensile strength test:

[0104] Test standard reference "GB / T 1040 Determination of tensile properties of plastics"

[0105] The simulated flexible composite material of the present invention is cut into samples of 5 cm×20 cm, 5 samples each in the longitudinal direction and the transverse direction;

[0106] Place the sample symmetrically in the clamp of the tensile testing machine, with the long side of the sample parallel to the tensile direction and the short side perpendicular to the pulling direction. The longitudinal axis of the sample coincides with the center line of the upper and lower clamps, with appropriate tightness;

[0107] After the sample is clamped, the test begins. The sample is stretched until it breaks, and the maximum load Fmax at break is recorded. The tensile strength is calculated using the formula Calculate, where b is the width of the specimen.

[0108] Test results: The average longitudinal tensile strength of the five specimens was 370.2 N / cm, and the average transverse tensile strength was 321.8 N / cm.

[0109] (2) Helium permeability test:

[0110] Test standard reference "GB / T 1038-2000 Plastic film and sheet gas permeability test method pressure difference method"

[0111] The fake flexible composite material of the present invention is cut into circles with a diameter of 97 mm, with a total of 3 samples;

[0112] Place the sample on the test table disc of the gas permeameter, cover it with the top cover and tighten it;

[0113] Open the needle valve and isolation valve of the high-pressure chamber, start to evacuate to above 27Pa, and continue degassing for 3 hours;

[0114] Close the isolation valve, open the test gas cylinder and the gas source switch to fill the high-pressure chamber with helium to 0.5MPa;

[0115] Close the exhaust needle valves of the high and low pressure chambers and start the helium permeation test for 1 hour;

[0116] After the test, take the average value of the three samples.

[0117] Test results: The average helium permeability of the three samples is 1.273L / ( ).

[0118] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0119] The parts not elaborated in detail in the description of the present invention belong to the known technology in the art. The above embodiments are provided only for the purpose of describing the present invention, and are not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims. Various equivalent substitutions and modifications made without departing from the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A flexible composite false indication material, characterized in that: The flexible composite false indication material includes, from the outside to the inside, a welding layer, an optical false indication layer, a load-bearing layer, a radar reflection layer, an infrared radiation layer and a gas barrier layer; wherein the infrared radiation layer includes a heat absorption layer and two thermal insulation layers, and the heat absorption layer is arranged between the two thermal insulation layers.

2. The flexible composite false indication material according to claim 1, characterized in that: The welding layer is a polyurethane adhesive layer, and the weight of the welding layer is not less than 10 , and / or, the optical false layer has a grammage of not less than 15 .

3. The flexible composite false indication material according to claim 2, characterized in that: The weight of the welding layer is 10-13 , and / or, the optical false layer has a gram weight of 20 to 30 .

4. The flexible composite false indication material according to claim 1, characterized in that: The weight of the bearing layer is not less than 90 , the breaking strength is not less than 240N / cm; and / or the gram weight of the radar reflection layer is not less than 30 The radar reflection layer is a solvent-based polyurethane filled with highly conductive metal powder, wherein the mass of the highly conductive metal powder accounts for more than 60% of the total mass of the radar reflection layer.

5. The flexible composite false indication material according to claim 4, characterized in that: The weight of the bearing layer is 100-110 , and / or, the radar reflection layer has a gram weight of 30 to 40 .

6. The flexible composite false indication material according to claim 1, characterized in that: The infrared radiation layer has a gram weight of not less than 80 , and / or, the gas barrier layer has a gram weight of not less than 20 .

7. The flexible composite false indication material according to claim 6, characterized in that: The infrared radiation layer has a gram weight of 80 to 90 , and / or, the gas barrier layer has a gram weight of 25 to 30 .

8. The flexible composite false indication material according to claim 6, characterized in that: The weight of the heat absorbing layer in the infrared radiation layer is not less than 50 The weight of each insulation layer is not less than 15 .

9. The method for preparing the flexible composite false-indicating material according to any one of claims 1 to 8, characterized in that: The steps include: Composite the radar reflection layer on the bearing layer to obtain a first composite body; Compounding the infrared radiation layer on one side of the radar reflection layer of the first composite body to obtain a second composite body; Compounding a gas barrier layer on one side of the infrared radiation layer of the second composite to obtain a third composite; Compounding an optical pseudo-layer on one side of the bearing layer of the third composite body to obtain a fourth composite body; The flexible composite false indication material can be obtained by compounding a welding layer on one side of the optical false indication layer of the fourth composite body.

10. The preparation method according to claim 9, characterized in that: The preparation method of the infrared radiation layer comprises the following steps: melt-extrude polyurethane master batch doped with carbon-based conductive material to obtain a heat absorption layer, and then compound the heat-insulating layer on both sides of the polyurethane film filled with carbon-based conductive material.

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