Composite material fabric, preparation method thereof, and helmet cover made using the same

Abstract

The invention discloses a composite material fabric, a preparation method thereof, and a helmet cover made using the composite material fabric, relating to the technical field of helmet cover preparation. Specifically, a nylon fabric is washed with water to remove surface impurities, and then dried after completion; an adhesive is applied to the surface of the nylon fabric, and the fabric is left to stand for 20-30 minutes. After completion, a bionic functional film is covered on the upper surface of the nylon fabric; and the bionic functional film is hot-pressed to melt the bionic functional film and impregnate the nylon fabric into one. The invention designs a composite material fabric and processes the composite material fabric into a helmet cover device, thereby achieving a stealth effect of the helmet against infrared and visible light band reconnaissance equipment, greatly reducing the probability of combatants being discovered on the battlefield and reducing casualties.

Description

Technical Field

[0001] The invention relates to the technical field of helmet cover preparation, in particular to a composite material fabric and a preparation method thereof, and a helmet cover prepared using the composite material fabric. Background Art

[0002] In the modern battlefield environment, with the introduction of various night vision reconnaissance equipment, general tactical concealment means have basically become ineffective. Under the advanced reconnaissance equipment, combat personnel will be unilaterally transparent on the battlefield, and then be attacked by various lethal weapons, causing casualties. This requires that personnel and equipment must achieve stealth against various reconnaissance equipment, especially visible light and infrared reconnaissance stealth.

[0003] In view of the above problems, it is necessary to develop a composite material fabric and process the composite material fabric into a helmet cover device by designing corresponding processes, so as to achieve the stealth effect of the helmet against infrared and visible light band reconnaissance equipment, greatly reducing the probability of combatants being discovered on the battlefield and reducing casualties. Summary of the Invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a composite material helmet cover and a preparation process thereof.

[0005] The technical solutions of the present invention are as follows:

[0006] A method for preparing a composite fabric comprises the following steps:

[0007] a. Wash the nylon fabric with water to remove surface debris and dry it after completion;

[0008] b. Apply adhesive to the surface of the nylon fabric and let it sit for 20-30 minutes. After completion, cover the bionic functional film on the upper surface of the nylon fabric;

[0009] c. Then, the bionic functional membrane is subjected to a hot pressing process to make the bionic functional membrane hot-melted and melted together with the nylon fabric to obtain a whole.

[0010] As a preferred embodiment of the present invention, the method for preparing the biomimetic functional membrane comprises the following steps:

[0011] S1: Mix chlorophyll, anthocyanin, and carotene, add them to an ethanol solution, soak for 20-25 hours, filter, let stand, and collect the supernatant to obtain an ethanol solution of chlorophyll, anthocyanin, and carotene;

[0012] S2: PVA is heated and dissolved in distilled water to obtain a PVA aqueous solution; chlorophyll, anthocyanin, and carotene ethanol solutions are mixed with the PVA aqueous solution and stirred for 10-15 minutes. The resulting uniform solution is poured into a mold and air-dried at room temperature in the dark to obtain a biotin / PVA film;

[0013] S3: Plant fiber, triethylamine, cobalt powder, sulfur powder, and stabilizer are mixed, dissolved and beaten into a slurry, and then paper-made, pressed, and dried to obtain an infrared stealth layer;

[0014] S4: The biotin / PVA film and the infrared stealth layer are bonded together in sequence using a polyurethane adhesive. The adhesive is evenly applied. After bonding, a biomimetic functional film is obtained.

[0015] As a preferred embodiment of the present invention, in S1, the mass ratio of chlorophyll, anthocyanin, carotene and ethanol is 1-4:1-4:1-4:10.

[0016] As a preferred embodiment of the present invention, in S3, the mass ratio of plant fiber, triethylamine, cobalt powder, sulfur powder and stabilizer is 10:6:5:5:1-3.

[0017] As a preferred embodiment of the present invention, the mass concentration of the PVA aqueous solution is 8-10%.

[0018] As a preferred embodiment of the present invention, the hot pressing process is as follows: the hot pressing pressure is 1.8±0.1 bar, and the hot pressing temperature is 120±3°C.

[0019] The present invention also discloses a composite material fabric, which is prepared by any of the above preparation methods.

[0020] The present invention discloses a helmet cover, comprising a left piece, a right piece and a middle piece, wherein the left piece, the right piece and the middle piece are obtained by cutting the composite material fabric as described above.

[0021] As a preferred embodiment of the present invention, the helmet cover is an elliptical spherical structure with a plurality of locking sockets distributed around the periphery, Velcro sewn on the left, right and top, and an elastic threaded strip sewn on the bottom.

[0022] The present invention also discloses an application of the composite material fabric described above in making clothing, tents and camouflage nets.

[0023] The beneficial effects of the present invention are:

[0024] This invention provides a composite fabric and a helmet protective cover using this material. Through corresponding process design, the helmet's anti-surveillance performance is significantly improved, protecting personnel and reducing casualties. The basic principle is that the biotin stealth camouflage biomimetic functional film has a reflectance spectrum consistent with that of plant leaves, with a similarity of over 95%. This camouflage material has a high spectral similarity to plant leaves and excellent weather resistance, specifically countering reconnaissance using spectral imaging technology. It also absorbs specific infrared bands, providing an infrared shielding and stealth effect, providing a new camouflage solution for reconnaissance in the visible and near-infrared bands.

[0025] Since the base material of the bionic functional membrane is PVA, the fabric material composited with PVA and nylon fabric has a good hydrophobic effect and can prevent the penetration of external rain and splashing water, thereby providing good environmental adaptability for the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The structure of the helmet cover of the preferred embodiment of the present invention is schematically shown. Figure 1 ;

[0027] Figure 2 The structure of the helmet cover of the preferred embodiment of the present invention is schematically shown. Figure 2

[0028] Figure 3 Schematic diagram of the structure of the left (right) piece;

[0029] Figure 4 Schematic diagram of the structure of the middle piece;

[0030] Figure 5 for Figure 1 Schematic diagram of the structure of the elastic thread strip;

[0031] In the figure, 1-right piece, 2-middle piece, 3-socket, 4-first hook and loop fastener, 5-second hook and loop fastener, 6-left piece, 7-elastic thread strip. DETAILED DESCRIPTION

[0032] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0034] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0035] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0036] Reference Figures 1 to 5 , the preferred embodiment of the present invention:

[0037] A helmet cover comprises a left panel 6, a right panel 1 and a middle panel 2, wherein the left panel 6, the right panel 1 and the middle panel 2 are cut from composite material fabric.

[0038] More specifically, the helmet cover is an ellipsoidal spherical structure with a plurality of locking sockets 3 distributed around it, into which branches and plants can be inserted to improve the camouflage performance of the helmet cover; a second Velcro 5 and a first Velcro 4 are sewn on the left, right and top respectively, which can be used to stick other external functional modules; an elastic threaded strip 7 is sewn on the bottom.

[0039] Furthermore, as an illustration of the process effect, the various functional components are sewn together using a sewing process with a stitch spacing of 2mm.

[0040] In some applications, the left panel 6 and the right panel 1 have an elliptical curved edge on the upper portion and a wavy curved edge on the lower portion. This structure can smoothly fit the surface curve of the helmet to ensure that the helmet cover is flat and wrinkle-free.

[0041] The special-shaped curve is designed to conform to the complex curved surface features of the helmet, so that the fabric with a certain rigidity can be smoothly applied to the helmet surface.

[0042] The middle panel 2 is specifically a spindle-shaped structure with arc edges, which can match the curved edges of the left and right panels of the helmet cover to ensure that the helmet cover is flat and wrinkle-free.

[0043] The arc-edge shuttle-shaped structure is specifically matched with the left panel 6 and the right panel 1 designed according to the complex curved surface features of the helmet surface. The combination of the three can form a helmet cover structure that is topologically consistent with the arc of the helmet surface.

[0044] The elastic thread strip 7 has a stiffness modulus of 8-10 and is approximately 15mm wide. It is sewn to the lower edge of the helmet cover and, through its high elasticity, secures the cover to the helmet. Furthermore, as a structural example, the elastic thread strip 7 automatically contracts with the edge of the helmet after the cover is attached, providing a certain preload force to keep the cover in place and prevent it from falling off.

[0045] Example 1

[0046] The formula and processing technology of a biomimetic functional membrane are as follows: (Unit: parts by weight)

[0047]

[0048] S1. Preparation of biotin / PVA film: A mixture of chlorophyll, anthocyanin, and carotene raw materials was placed in an ethanol solution and soaked for 20-25 hours. The mixture was filtered through a 500-mesh sieve and allowed to stand for 10 hours. After completion, the impurity-free upper solution was removed and extracted to obtain an ethanol solution of chlorophyll, anthocyanin, and carotene.

[0049] S2. Heat PVA to dissolve in distilled water at 98±2°C to prepare a 10% PVA aqueous solution. Mix the ethanolic solutions of chlorophyll, anthocyanin, and carotene with the PVA aqueous solution in a 1:1 mass ratio. Pour the mixture into a high-speed mixer and stir for 15 minutes. Pour the resulting uniform solution into a mold and air-dry at room temperature in the dark to obtain a biotin / PVA film.

[0050] Since chlorophyll, anthocyanin and carotene are the basic factors for the formation of various colors of plants in nature and exist in large quantities in plants, they have a wide range of spectral characteristics in nature. The film prepared using them can make the equipment have spectral characteristics that are almost consistent with plants when observed by reconnaissance equipment, thereby making personnel and equipment "invisible" and rendering the reconnaissance equipment ineffective.

[0051] S3. Preparation of infrared stealth layer: Plant fiber, triethylamine, cobalt powder, sulfur powder, and stabilizer are put into a high-speed mixer, dissolved and beaten into a slurry, and then papered, squeezed, and dried to obtain a 30g / m 2 wherein the stabilizer is epoxidized soybean oil, but is not limited thereto.

[0052] This formula has a good absorption effect on the infrared spectrum of a specific band, which can enable the bionic functional film to achieve the stealth effect in the infrared band.

[0053] S4. Overall compounding of materials: Bond the biotin / PVA film and infrared stealth layer together in sequence with polyurethane adhesive. Apply the adhesive evenly with a coating amount of 18g / m 2 After bonding, the thickness is 0.26mm and the mass density is 63g / m 2 Biotin stealth camouflage biomimetic functional membrane.

[0054] Biotin and infrared stealth materials are integrated into PVA film, which can be combined with other materials during use to expand the material's adaptability.

[0055] The composite material fabric has the following preparation process:

[0056] a. Wash the nylon fabric with distilled water to remove surface debris, and then dry it with a high-temperature irradiation lamp;

[0057] b. Apply a high-viscosity, slow-drying polyurethane adhesive to the surface of the nylon fabric and let it sit for 30 minutes. After completion, cover the bionic functional film on the upper surface of the nylon fabric and place both on a conveyor belt with a high-speed airflow guide groove between them.

[0058] c. Start the conveyor belt and open the high-speed airflow guide slot. The high-speed airflow blows the bionic functional membrane, flattens it, and covers it on the surface of the nylon fabric. Both pass through the hot roll at the same time, pressurized at 1.8±0.1 bar, heated at 120±3℃, and rotated at 10 rpm, so that the bionic functional membrane is hot-melted and impregnated with the nylon fabric.

[0059] More specifically, the nylon fabric is an orthogonal plain weave fabric with a surface density of 150 g / m 2 , color white.

[0060] The low-surface-density white fabric can maximize the shielding and absorption effects of the bionic functional membrane on specific spectra and achieve lightweight helmet cover.

[0061] A helmet cover

[0062] 1. Prepare the biomimetic functional membrane according to the above method.

[0063] 2. Prepare composite fabric according to the above method.

[0064] 3. Basis Figure 1-5 The cutting method includes cutting the composite material fabric, preparing the helmet cover sewing piece, using a positioning template, marking the socket at the corresponding position of the piece, using a blade, cutting the socket to a predetermined size, and locking the socket.

[0065] 4. Sew the Velcro to the predetermined position of each piece using sewing technology, with a spacing of 2mm between the stitches, and remove the thread ends.

[0066] 5. Sew the left piece 6 of the helmet cover to the middle piece 2 of the helmet cover, with an overlap size of 5±2mm. Use sewing technology to sew the materials together, with a spacing of 2mm between the legs, and remove the thread ends.

[0067] 6. Sew the right piece 1 of the helmet cover to the middle piece 2 of the helmet cover, with an overlap size of 5±2mm. Use sewing technology to sew the materials together, with a spacing of 2mm between the legs, and remove the thread ends.

[0068] 7. Sew the elastic thread strip 7 to the lower part of the helmet cover. When sewing, the elastic thread strip 7 should be sewn under a tension of 5N. After completion, the elastic thread strip 7 pulls the lower edge of the helmet cover and is in an automatic contraction state.

[0069] The following tests were performed on the helmet cover prepared in Example 1. The test results are shown in the following table:

[0070]

[0071] Through the above performance tests, it is found that the helmet cover prepared by the present invention has a small contrast difference between visible light brightness and near-infrared brightness, and has a good infrared shielding and stealth effect.

[0072] The composite material fabric of the present invention is not limited to the above-mentioned helmet cover. Its technical effects can be used to make clothes, tents, camouflage nets, etc., and can achieve the same protective effect as a helmet cover.

[0073] Under the premise that no conflict occurs, those skilled in the art may freely combine and superimpose the above-mentioned additional technical features.

[0074] The above descriptions are merely preferred embodiments of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the scope of protection of the present invention.

Claims

1. A method for preparing a composite fabric, characterized in that: The following steps are involved: a. Wash the nylon fabric with water to remove surface debris and dry it after completion; b. Apply adhesive to the surface of the nylon fabric and let it sit for 20-30 minutes. After completion, cover the bionic functional film on the upper surface of the nylon fabric; c. The biomimetic functional membrane is then subjected to a hot pressing process to melt the biomimetic functional membrane and impregnate the nylon fabric into one body to obtain; The preparation method of the biomimetic functional membrane comprises the following steps: S1: Mix chlorophyll, anthocyanin, and carotene, add them to an ethanol solution, soak for 20-25 hours, filter, let stand, and collect the supernatant to obtain an ethanol solution of chlorophyll, anthocyanin, and carotene; S2: PVA is heated and dissolved in distilled water to obtain a PVA aqueous solution; chlorophyll, anthocyanin, and carotene ethanol solutions are mixed with the PVA aqueous solution and stirred for 10-15 minutes. The resulting uniform solution is poured into a mold and air-dried at room temperature in the dark to obtain a biotin / PVA film; S3: Plant fiber, triethylamine, cobalt powder, sulfur powder, and stabilizer are mixed, dissolved and beaten into a slurry, and then paper-made, pressed, and dried to obtain an infrared stealth layer; S4: The biotin / PVA film and the infrared stealth layer are bonded together in sequence using a polyurethane adhesive. The adhesive is evenly applied. After bonding, a biomimetic functional film is obtained.

2. The method for preparing a composite material fabric according to claim 1, characterized in that: In the S1, the mass ratio of chlorophyll, anthocyanin, carotene and ethanol is 1-4:1-4:1-4:

10.

3. The method for preparing a composite material fabric according to claim 1, characterized in that: In S3, the mass ratio of plant fiber, triethylamine, cobalt powder, sulfur powder and stabilizer is 100:60:5:5:

2.

4. The method for preparing a composite material fabric according to claim 1, characterized in that: The mass concentration of the PVA aqueous solution is 8-10%.

5. The method for preparing a composite material fabric according to claim 1, characterized in that: The hot pressing process is as follows: the hot pressing pressure is 1.8±0.1 bar, and the hot pressing temperature is 120±3°C.

6. A composite fabric, characterized in that: The method is prepared according to any one of claims 1 to 5.

7. A helmet cover, characterized in that: The invention comprises a left cut piece (6), a right cut piece (1) and a middle cut piece (2), wherein the left cut piece (6), the right cut piece (1) and the middle cut piece (2) are cut from the composite material fabric according to claim 6.

8. The helmet cover according to claim 7, characterized in that: The helmet cover is an elliptical spherical structure, with multiple sockets (3) distributed around its periphery, hook and loop fasteners sewn on the left, right and top, and an elastic threaded strip (7) sewn on the bottom.

9. Use of the composite fabric according to claim 6 in making clothing, tents and camouflage nets.

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