Electromagnetic shielding composite fabric based on graphene textile material and preparation method thereof

Abstract

The invention discloses an electromagnetic shielding composite fabric based on a graphene textile material and a preparation method thereof, and relates to the technical field of fabrics. According to the technical scheme, the fabric is characterized by comprising an inner layer, a middle layer and an outer layer which are sequentially arranged from inside to outside, the inner layer is formed by weaving 150D / 96F polyester DTY and cotton yarn, the outer layer is formed by weaving 75D / 96F polyester POY, the middle layer comprises graphene layers on the two sides and a gel layer located in the middle, the graphene layers are arranged to be full-coating layers, and the gel layer is arranged to be full-coating layers. The gel layer is formed by mixing nanofiber aerogel and TPU hot melt adhesive, the mixing ratio of the nanofiber aerogel to the TPU hot melt adhesive is 3: 1, graphene materials are evenly arranged in the fabric, and according to the electromagnetic shielding performance of graphene, clothes made of the fabric are safer to use in a specific environment.

Description

Technical Field

[0001] The present invention relates to the technical field of fabrics, and more specifically, to an electromagnetic shielding composite fabric based on graphene textile materials and a preparation method thereof. Background Art

[0002] From the weaving method, it can be divided into: woven fabrics and types. From the processing technology, it can be divided into: grey cloth, bleached cloth, dyed cloth, printed cloth, yarn-dyed cloth, mixed process cloth (such as printing on yarn-dyed cloth, composite cloth, flocking cloth, imitation fur cloth), etc. It can also be divided by raw materials: cotton cloth, chemical fiber cloth, linen cloth, woolen cloth, silk and blended fabrics, etc.

[0003] Graphene fabric is an innovative textile product with graphene as the key material. This fabric has multiple advantages, including excellent antibacterial properties, which can effectively inhibit bacterial growth; far-infrared function, which can promote blood circulation and anti-oxidation; and excellent moisture absorption and perspiration and quick-drying functions, which keep you dry and comfortable. Graphene fabric is widely used in clothing for specific occasions.

[0004] A Chinese invention patent with application publication number CN201910385345.6 discloses a graphene-containing fabric and a preparation method thereof, which is characterized in that: it includes a modified graphene fiber layer and a polyester fiber layer, and the weight percentage of the modified graphene fiber layer in the fabric does not exceed 30%; the polyester fiber layer is woven from polyester filaments; the modified graphene fiber layer is woven from graphene staple fibers after plying, but this application mainly improves the graphene yarn required for weaving the graphene fiber layer. Although the performance of the graphene fiber layer is improved, it is of little help in the composite of graphene and conventional fabrics. Therefore, it is necessary to propose a new solution to improve the performance of graphene composite fabrics. Summary of the invention

[0005] In view of the deficiencies in the prior art, the object of the present invention is to provide an electromagnetic shielding composite fabric based on graphene textile material and a preparation method thereof.

[0006] The above technical purpose of the present invention is achieved through the following technical scheme: an electromagnetic shielding composite fabric based on graphene textile material, comprising an inner layer, a middle layer and an outer layer arranged in sequence from the inside to the outside, the inner layer is woven from 150D / 96F polyester DTY and cotton yarn, the outer layer is woven from 75D / 96F polyester POY, the middle layer includes graphene layers on both sides and a gel layer in the middle, the graphene layer is set as a full coating, the gel layer is formed by mixing nanofiber aerogel and TPU hot melt adhesive, and the mixing ratio of the nanofiber aerogel and TPU hot melt adhesive is 3:1.

[0007] The present invention is further configured as follows: the sides of the inner layer and the outer layer that are close to each other are respectively recessed to form recessed grooves, and protrusions embedded in the recessed grooves are formed on both sides of the middle layer.

[0008] The present invention is further configured such that: the protrusions on the intermediate layer are formed by a gel layer.

[0009] A method for preparing an electromagnetic shielding composite fabric based on graphene textile material, the preparation method comprising the following steps: Step 1: Press out a convex block with a depression on one side and a protrusion on the other side on the copper foil to be used; Step 2: placing the copper foil with the depressed groove pressed into a reactor for CVD chemical vapor deposition reaction, the copper foil is placed at the bottom of the reactor, hot-pressing the reactor and filling it with methane and hydrogen for 30 to 60 minutes, and the carbon atoms in the methane are deposited on the copper foil to form a graphene layer; Step 3: The rubber is pressed by hot dry pressing to form a rubber film with one side concave and the other side protruding, and the protruding shape and size of the rubber film are consistent with the shape and size of the concave groove of the copper foil; Step 4: spin-coating polymethyl methacrylate (PMMA) onto the graphene surface, heating and curing, etching the copper foil with FeCl3 solution, washing the polymethyl methacrylate (PMMA) and graphene in deionized water for several times, transferring the polymethyl methacrylate (PMMA) and graphene to the rubber film, and finally heating the graphene to conformal contact with the rubber film, dissolving the polymethyl methacrylate (PMMA) in acetone, and transferring and fixing the graphene on the rubber film; Step 5: With the side where the graphene is fixed facing upward, the rubber film is conveyed to the coating device, and the mixture of the nanofiber aerogel and the TPU hot melt adhesive is coated on the graphene. After the coating is completed, the mixture is dried and solidified to form a gel layer on the side where the graphene is provided on the rubber film; Step 6: After drying, transfer is performed. Two processed, coated and dried rubber films are grouped together. The flipping device flips the rubber film at the front side over the rubber film at the back, and the initial squeezing roller squeezes the composite rubber film for initial connection. Step 7: After the initial connection is completed, the rubber film is sent to the oven 1, and the oven 1 melts the TPU hot melt adhesive in the gel layer. After the oven 1, a pair of extrusion rollers are set to extrude the rubber film on both sides, and the TPU hot melt adhesive in the gel layer on both sides is fused and connected; Step 8: After passing through oven 1, enter oven 2. Oven 2 heats the TPU hot melt adhesive to melt the gel layers on both sides, and at the same time, the rubber film begins to melt and separate from the graphene layer; Step 9: After melting, cool down and apply glue again on both sides of the graphene layer, so that the inner layer and the outer layer are bonded to both sides of the graphene layer.

[0010] The present invention is further configured as follows: the rubber film is conveyed by a conveyor belt, the coating device includes a stirring kettle for mixing nanofiber aerogel and TPU hot melt adhesive, a plurality of extrusion guns and a scraper, the kettle wall of the stirring kettle is provided with a heating chamber, the heating chamber is provided with a heating rod for maintaining the temperature of the stirring kettle, the extrusion amount of the plurality of extrusion guns is controlled by a program, the extrusion amount of the plurality of extrusion guns when the plurality of extrusion guns are placed above the depression of the rubber film is greater than that of other areas, and the scraper is welded and fixed to the side walls of the plurality of extrusion guns.

[0011] The present invention is further configured as follows: the flipping device includes a rotatably connected storage rack and two flipping parts slidably connected to the storage rack, the flipping part includes a conveyor traction belt and an attraction frame, the top surface of the conveyor traction belt located below is flush with the conveyor belt, the attraction frame is fixed to the side wall of the conveyor traction belt, and a plurality of air holes are provided on the attraction frame, and the plurality of air holes are used to adsorb and fix the rubber membrane on the attraction frame, after the rubber membrane is fixed, the storage rack is rotated 180 degrees so that the rubber membrane is located above, and the attraction frame slides downward to cover the rubber membrane below.

[0012] The present invention is further configured as follows: the rubber film is conveyed in oven one and oven two by a roller conveyor belt, the extrusion roller one is arranged between oven one and oven two, the temperature of oven one is set at 80 degrees, and the temperature of oven two is set at two levels of 120 degrees and 150 degrees respectively, a plurality of fans arranged in an array are arranged on the top and bottom surfaces of oven two, the openings of the fans face oven one, a nano anti-stick coating is applied on the rollers on the roller conveyor belt, and a storage box for collecting the melted rubber film is arranged on the bottom surface of oven two.

[0013] In summary, the present invention has the following beneficial effects: Clothing made of fabrics with added graphene will have better warmth retention effect, and the wear resistance and electromagnetic shielding effect can also protect the safety of experimenters. The graphene layer is set as a full coating, which ensures that the entire fabric is covered with a graphene layer, making the fabric safer to use as a whole. The gel layer is formed by mixing nanofiber aerogel and TPU hot melt adhesive. The mixing ratio of nanofiber aerogel and TPU hot melt adhesive is 3:1. Nanofiber aerogel has the characteristics of low density, high strength, high temperature resistance, acid and alkali resistance, etc., which further improves the performance of graphene composite fabrics and ensures the lightness and high performance of graphene fabrics. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the composite fabric in the present invention; Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle; Figure 3 It is a structural schematic diagram of the processing equipment in the present invention; Figure 4 It is a schematic diagram of the structure of the coating device in the present invention; Figure 5 for Figure 4 The enlarged schematic diagram of point B in the middle; Figure 6 is a cross-sectional view of the processing equipment in the present invention; Figure 7 for Figure 6 The enlarged schematic diagram of the center C; Figure 8 for Figure 6 Enlarged schematic diagram of point D in the middle.

[0015] In the figure: 1. inner layer; 2. middle layer; 3. outer layer; 4. graphene layer; 5. gel layer; 6. depression groove; 7. stirring kettle; 8. extrusion gun; 9. scraper; 10. storage rack; 11. conveyor belt; 12. suction frame; 13. air vent; 14. roller conveyor belt; 15. oven one; 16. oven two; 17. fan; 18. extrusion roller one. DETAILED DESCRIPTION

[0016] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments. Example

[0017] An electromagnetic shielding composite fabric based on graphene textile material, such as Figure 1 As shown, from the inside to the outside, an inner layer 1, a middle layer 2 and an outer layer 3 are sequentially arranged. The three-layer arrangement makes the composite fabric thicker. Clothing made of such fabric is usually used in special scenes such as some laboratories. Therefore, although the production cost of such fabric is high, the places where it is needed are also few. The inner layer 1 is woven by 150D / 96F polyester DTY and cotton yarn. The 150D / 96F polyester DTY is used as the warp and the cotton yarn is used as the weft to weave the inner layer 1 through a water jet loom. The high structural strength of the polyester yarn ensures the stability of the shape of the inner layer 1. The moisture absorption and air permeability of the cotton yarn are very good. When in contact with the body surface, it can absorb the sweat on the body surface into the fabric more quickly to ensure the comfort of the fabric. In addition, 150D / 96F polyester DTY is softer than 75D / 96F polyester POY. The outer layer 3 is woven by 75D / 96F polyester POY. The hardness and strength of 75D / 96F polyester POY are slightly higher, and the woven outer layer 3 is also more wear-resistant and smooth.

[0018] like Figure 1 and Figure 2As shown, the middle layer 2 includes graphene layers 4 on both sides and a gel layer 5 in the middle. The graphene layer 4 has good corrosion resistance and electromagnetic shielding effect, and the graphene heats up quickly. In order to maintain purity and stability in the laboratory, the temperature is usually low. The clothing made of fabrics with added graphene will also have a better warming effect. The wear resistance and electromagnetic shielding effect can also protect the safety of the experimenters. The graphene layer 4 is set as a full coating. The full coating ensures that the entire fabric is covered with the graphene layer 4, and the overall use of the fabric is safer. The gel layer 5 is formed by mixing nanofiber aerogel and TPU hot melt adhesive. The mixing ratio of nanofiber aerogel and TPU hot melt adhesive is 3:1. Nanofiber aerogel has the characteristics of low density, high strength, high temperature resistance, acid and alkali resistance, etc., which further improves the performance of the graphene composite fabric. TPU hot melt adhesive has good viscosity and a low melting point. When processing the middle layer 2, it is better fixed by TPU hot melt adhesive, but the content of TPU hot melt adhesive is relatively small, which has little effect on the nanofiber aerogel, ensuring the lightness and high performance of the graphene fabric.

[0019] like Figure 1 and Figure 2 As shown, the inner layer 1 and the outer layer 3 are respectively recessed on one side where they are close to each other to form a recessed groove 6, the recessed grooves 6 on the inner layer 1 and the outer layer 3 are formed by hot pressing, protrusions embedded in the recessed grooves 6 are formed on both sides of the middle layer 2, and the protrusions on the middle layer 2 are formed by the gel layer 5. When the three layers are compounded together, the protrusions on the middle layer 2 are embedded in the recessed grooves 6 on the inner layer 1 and the outer layer 3, thereby increasing the connection area between the middle layer 2 and the inner layer 1 and the outer layer 3, and enhancing the proportion of graphene in the composite fabric.

[0020] A method for preparing an electromagnetic shielding composite fabric based on graphene textile materials, such as Figure 1-Figure 8 As shown, the preparation method comprises the following steps: Step 1: Pressing a protruding block with a depression on one side and a protrusion on the other side of the copper foil to be used, and after precipitation of the important carbon atoms for forming graphene, a graphene layer 4 will be formed under the reaction catalysis of the copper foil. The shape of the graphene after formation can be adjusted by adjusting the shape of the copper foil. Therefore, after pressing the protruding block on the initial copper foil, an intermittently arched graphene layer 4 is precipitated; Step 2: placing the copper foil with the protruding blocks pressed out in a reactor for CVD chemical vapor deposition reaction, the copper foil is placed at the bottom of the reactor with the arch of the copper foil facing upward, hot pressing the reactor and filling it with methane and hydrogen, reacting for 30 to 60 minutes, the carbon atoms in the methane are deposited on the copper foil to form a graphene layer 4, the carbon atom content in methane is high, and the filling of hydrogen accelerates the decomposition of methane; Step 3: The rubber is pressed by hot dry pressing to form a rubber film with one side concave and the other side arched, and the arched shape and size of the rubber film are consistent with the shape and size of the concave groove 6 of the copper foil. The rubber film is used to transfer the graphene layer 4 formed on the copper foil, which is convenient for the subsequent processing of the graphene layer 4. The rubber film is also processed to be concave. When transferring the graphene layer 4, the rubber film can be completely attached to the surface of the copper foil, ensuring that the graphene layer 4 on the copper foil can be stably transferred to the rubber film; Step 4: Spin-coat polymethyl methacrylate (PMMA) onto the graphene surface, heat and cure, etch the copper foil with FeCl3 solution, wash the polymethyl methacrylate (PMMA) and graphene in deionized water for several times, transfer the polymethyl methacrylate (PMMA) and graphene to the rubber film, and finally heat the graphene to conformal contact with the rubber film, dissolve the polymethyl methacrylate (PMMA) in acetone, and transfer and fix the graphene on the rubber film. The etching of the copper foil causes the graphene transfer process to be more expensive, so the number of composite fabrics that can be produced is small and can only meet the needs of specific occasions. After long-term contact with the human body, polymethyl methacrylate (PMMA) will cause a certain degree of damage to the human body, so it needs to be dissolved by organic solvents such as acetone. The rubber film uses vulcanized rubber, which will not dissolve in acetone. Finally, the graphene layer 4 is completely transferred to the rubber film to facilitate subsequent processing; Step 5: The side with the graphene fixed is facing upwards. At this time, the graphene layer 4 is flipped 180 degrees compared to when it was precipitated, so that the arched part of the graphene layer 4 becomes concave when it is precipitated. The rubber film is conveyed to the coating device to mix the nanofiber aerogel and TPU hot melt adhesive and then smear it on the graphene. After the coating is completed, it is dried and solidified on the side of the rubber film where the graphene is provided to form a gel layer 5. The nanofiber aerogel and TPU hot melt adhesive are smeared on the top of the graphene. The nanofiber aerogel is mainly used to improve the warmth retention effect of the composite fabric. In this way, the nanofiber aerogel is also compositely fixed to the fabric. The viscosity of the TPU hot melt adhesive to the graphene layer 4 is greater than that of the rubber film to the graphene layer 4. On the one hand, it is convenient to peel off the rubber film later, and on the other hand, it can also fix the graphene layer 4 and the nanofiber aerogel together; like Figure 2-Figure 5As shown, the production components of each part are fixed on the same set of frames, the rubber film is conveyed by a conveyor belt 1, both ends of the conveyor belt are supported by rotating rollers, the rotating rollers are rotatably connected to the frame, and at least one of the rotating rollers is driven by a motor, the coating device is located above the rotation path of the conveyor belt 1, the coating device includes a stirring kettle 7 for mixing nanofiber aerogel and TPU hot melt adhesive, a plurality of extrusion guns 8 and a scraper 9, the stirring kettle 7 is fixed to the frame by bolts, the stirring rod of the stirring kettle 7 is driven by a motor, a plurality of extrusion guns 8 are connected by a connecting plate, and the connecting plate is fixed to the bottom of the stirring kettle 7, the extrusion gun 8 is connected to the inside of the stirring kettle 7 through a pipeline, and a control program for controlling the extrusion amount of the extrusion gun 8 is provided on the machine body. If When the dry extrusion gun 8 is placed above the depression of the rubber film, the extrusion amount is greater than that of other areas. The extrusion amount of the extrusion gun 8 is controlled by controlling the extrusion time to ensure that the depression area of ​​the rubber film can be filled with nanofiber aerogel and TPU hot melt adhesive when scraping it flat. The wall of the stirring kettle 7 is provided with a heating chamber, and a heating rod for maintaining the temperature of the stirring kettle 7 is provided in the heating chamber. The heating rod maintains the temperature of the stirring kettle 7 to prevent the nanofiber aerogel and TPU hot melt adhesive from gradually solidifying in the stirring kettle 7 and affecting the mixing effect. The circumferential array of the heating rods is arranged in the heating chamber to keep the overall temperature of the stirring kettle 7 as balanced as possible. The scraper 9 is welded and fixed on the side walls of several extrusion guns 8. The scraper 9 spreads the nanofiber aerogel and TPU hot melt adhesive squeezed on the graphene layer 4 evenly.

[0021] Step six: After drying is completed, the two processed, coated and dried rubber films are grouped together. The flipping device flips the rubber film on the front side and covers it on the rubber film behind it. The initial extrusion roller extrude the composite rubber film for initial connection. After the two single pieces are dried and fixed, one side forms a bulge and the other side is in a flat state. In order to match the recessed grooves 6 on the inner layer 1 and the outer layer 3 at the same time, bulges must be formed on both sides of the middle layer 2. Therefore, the two processed pieces need to be fixed together. Due to the limited area of ​​the graphene precipitation furnace and the copper foil, they can only be processed into sheets of small areas. Therefore, two single pieces are grouped together, one of which is flipped and fixed to form the middle layer 2.

[0022] like Figure 7 As shown, the flipping device includes a rotatably connected rack 10 and two flipping parts slidably connected to the rack 10. The rack 10 is rotatably connected to the frame. The flipping part includes a conveyor traction belt 11 and an attraction frame 12. Two traction rollers are arranged at both ends of the conveyor traction belt 11. The traction rollers are rotatably connected to the frame. A driving motor is arranged at at least one end of the traction roller. The cross-sectional area covered by the attraction frame 12 is larger than the cross-sectional area of ​​the conveyor traction belt 11. The two flipping parts can slide on the rack 10 respectively, and the rotation of the rack 10 and the sliding of the flipping part are not rotated simultaneously with the conveyor traction belt 11.

[0023] like Figure 7As shown, the top surface of the conveyor traction belt 11 located below is flush with the conveyor belt, the suction frame 12 is fixed to the side wall of the conveyor traction belt 11, and a plurality of air holes 13 are provided on the suction frame 12. The plurality of air holes 13 are used to adsorb and fix the rubber membrane on the suction frame 12. After the rubber membrane is fixed, the storage rack 10180 degrees is rotated so that the rubber membrane is located above, and the suction frame 12 slides downward to cover the rubber membrane below.

[0024] like Figure 1 , Figure 2 and Figure 7 As shown, when the conveyor belt 1 transfers the dried rubber film, graphene layer 4 and gel layer 5 to the conveyor traction belt 11, the rotation of the conveyor traction belt 11 applies tension to the rubber film to transfer it to the conveyor traction belt 11. The frame is also provided with an exhaust pipe connected to the inside of the suction frame 12. When the exhaust pipe exhausts air, suction is generated. This suction is applied to the rubber film transferred to the conveyor traction belt 11 through the air vent 13. After adsorption and fixation, the rack 10 rotates 180 degrees around the frame. At the same time, the conveyor traction belt 11 stops rotating. After the previous rubber film rotates to the top, the conveyor traction belt 11 starts again. Since the rubber film itself has a certain weight, the middle part of the rubber film will form a certain degree of collapse after it is transferred to the top, and the rubber film The contact area with the traction conveyor belt becomes smaller, and the rotation of the traction conveyor belt will not drive the rubber film located above to move. Of course, you can also choose to adjust the driver to pause. At this time, the upper conveying traction belt 11 stops working. At this time, the rotation of the lower traction conveyor belt can pull the new rubber film transmitted through the conveyor belt to slide onto the conveying traction belt 11. After the later rubber film is placed accurately, the upper flipping part drives the previous rubber film to press downward, so that the previous rubber film and the subsequent rubber film are pressed together. The minimum spacing between the two flipping parts is less than the thickness of the two layers of rubber film stacked, so that the two layers of rubber film are slightly deformed after being pressed down, and the TPU hot melt adhesive in the gel layer 5 is slightly fused after deformation to complete the initial connection of the middle layer 2.

[0025] Step seven: After the initial connection is completed, it is sent into an oven 15. The oven 15 melts the TPU hot melt adhesive in the gel layer 5. An extrusion roller 18 is set behind the oven 15 to extrude the rubber film on both sides. The TPU hot melt adhesive in the gel layers 5 on both sides is fused and connected. Although the initially connected middle layer 2 can maintain the basic shape, the connection is not stable. The oven 15 heats the middle layer 2. Since the melting point of TPU hot melt adhesive is the lowest, it will melt first. The TPU hot melt adhesives in the two single sheets melt and fuse with each other, making the gel layer 5 of the middle layer 2 more firmly fused.

[0026] like Figure 2 , Figure 6 and Figure 8As shown, the temperature of the oven 15 is set at 80 degrees. At 80 degrees, the TPU hot melt adhesive begins to melt, so that the TPU hot melt adhesives in the two gel layers 5 fuse with each other to increase the stability of the connection. At this time, the rubber film is conveyed by the roller conveyor 14. The roller is set to be made of stainless steel. The thermal conductivity of stainless steel is poor, so the roller that continues to heat up is prevented from damaging the rubber film close to it. The squeezing roller 18 set behind the oven 15 squeezes the rubber film, so that the TPU hot melt adhesive in the gel layer 5 is more evenly fused. The side walls of the roller and the squeezing roller 18 are coated with a nano anti-stick coating to prevent the rubber film from sticking to the roller or the squeezing roller 18 when squeezed.

[0027] Step eight: Pass through oven one 15 and enter oven two 16. Oven two 16 heats the TPU hot melt adhesive to melt the gel layers 5 on both sides and fuse them together. The rubber film has a melting point of 100-130 degrees. At the same time, the rubber film begins to melt and separate from the graphene layer 4. The temperature of oven two 16 is set to two levels, 120 degrees and 150 degrees respectively. This temperature will not affect the graphene layer 4 and the nanofiber aerogel, but the TPU hot melt adhesive melts more thoroughly, and the rubber film also begins to gradually melt into a fluid. At the same time, the adhesion of the TPU hot melt adhesive to the graphene layer 4 is greater than the adhesion of the rubber film to the graphene layer 4, so the melting of the rubber film will not affect the graphene layer 4.

[0028] like Figure 1 , Figure 4 and Figure 6 As shown, the top and bottom surfaces of the oven 2 16 are provided with a plurality of fans 17 arranged in an array, the openings of the fans 17 face the oven 1 15, the rollers on the roller conveyor 14 are coated with a nano-anti-stick coating, and the bottom surface of the oven 2 16 is provided with a storage box for collecting the melted rubber film, and the rubber film is arranged on the outermost side and will fall off first, and the fans 17 assist in the falling off of the melted rubber film, ensuring that the rubber film on the middle layer 2 coming out of the oven 2 16 is completely fallen off, and the fallen rubber film flows into the storage box for recycling and reuse, thereby reducing the loss of production costs.

[0029] Step nine: After melting, cool down and apply glue again on both sides of the graphene layer 4. The inner layer 1 and the outer layer 3 are bonded to both sides of the graphene layer 4. After cooling, a complete middle layer 2 is formed. Subsequently, apply glue to composite the inner layer 1 and the outer layer 3 and complete the bonding through composite equipment or manual processing.

[0030] like Figure 2 As shown, Example 2 is different from Example 1 in that the rubber film can be removed in step 7 by applying toluene or other solvents that can dissolve the rubber film but will not affect the graphene layer 4. The graphene layer 4 itself has good corrosion resistance and is not easily damaged when the rubber film is dissolved, thereby ensuring the integrity of the graphene layer 4.

[0031] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An electromagnetic shielding composite fabric based on graphene textile material, characterized by: The invention comprises an inner layer (1), a middle layer (2) and an outer layer (3) which are arranged in sequence from the inside to the outside, wherein the inner layer (1) is woven from 150D / 96F polyester DTY and cotton yarn, the outer layer (3) is woven from 75D / 96F polyester POY, the middle layer (2) comprises graphene layers (4) on both sides and a gel layer (5) located in the middle, the graphene layer (4) is arranged as a full coating, and the gel layer (5) is formed by mixing nanofiber aerogel and TPU hot melt adhesive, and the mixing ratio of the nanofiber aerogel and TPU hot melt adhesive is 3:

1.

2. The electromagnetic shielding composite fabric based on graphene textile material according to claim 1, characterized in that: The inner layer (1) and the outer layer (3) are respectively recessed on one side thereof where they are close to each other to form a recessed groove (6), and protrusions embedded in the recessed groove (6) are formed on both sides of the middle layer (2).

3. The electromagnetic shielding composite fabric based on graphene textile material according to claim 2, characterized in that: The protrusions on the intermediate layer (2) are formed by the gel layer (5).

4. A method for preparing an electromagnetic shielding composite fabric based on graphene textile material, used for an electromagnetic shielding composite fabric based on graphene textile material according to any one of claims 1 to 3, characterized in that: The preparation method comprises the following steps: Step 1: Press out a convex block with a depression on one side and a protrusion on the other side on the copper foil to be used; Step 2: placing the copper foil with the protruding blocks pressed thereon in a reaction furnace for CVD chemical vapor deposition reaction, placing the copper foil at the bottom of the reaction furnace, hot pressing the reaction furnace and filling it with methane and hydrogen, reacting for 30 to 60 minutes, and the carbon atoms in the methane are deposited on the copper foil to form a graphene layer (4); Step 3: The rubber is pressed by hot dry pressing to form a rubber film with one side concave and the other side protruding, and the protruding shape and size of the rubber film are consistent with the shape and size of the concave groove (6) of the copper foil; Step 4: spin-coating polymethyl methacrylate (PMMA) onto the graphene surface, heating and curing, etching the copper foil with FeCl3 solution, washing the polymethyl methacrylate (PMMA) and graphene in deionized water for several times, transferring the polymethyl methacrylate (PMMA) and graphene to the rubber film, and finally heating the graphene to conformal contact with the rubber film, dissolving the polymethyl methacrylate (PMMA) in acetone, and transferring and fixing the graphene on the rubber film; Step 5: With the side where the graphene is fixed facing upward, the rubber film is transferred to a coating device, and the mixture of nanofiber aerogel and TPU hot melt adhesive is coated on the graphene. After coating, the mixture is dried and solidified to form a gel layer (5) on the side where the graphene is provided on the rubber film. Step 6: After drying, transfer is performed. Two processed, coated and dried rubber films are grouped together. The flipping device flips the rubber film at the front side over the rubber film at the back, and the initial squeezing roller squeezes the composite rubber film for initial connection. Step 7: After the initial connection is completed, the rubber film is sent to oven 1 (15), and oven 1 (15) melts the TPU hot melt adhesive in the gel layer (5). After oven 1 (15), an extrusion roller 1 (18) is set to extrude the rubber film on both sides, so that the TPU hot melt adhesive in the gel layer (5) on both sides is fused and connected; Step 8: After passing through oven 1 (15), the mixture enters oven 2 (16), where oven 2 (16) heats the TPU hot melt adhesive to melt the gel layers (5) on both sides, and at the same time, the rubber film begins to melt and separate from the graphene layer (4); Step nine: After melting, cool down and apply glue again on both sides of the graphene layer (4), so that the inner layer (1) and the outer layer (3) are bonded to both sides of the graphene layer (4).

5. The method for preparing an electromagnetic shielding composite fabric based on graphene textile material according to claim 4, characterized in that: The rubber film is conveyed by a conveyor belt. The coating device comprises a stirring kettle (7) for mixing nanofiber aerogel and TPU hot melt adhesive, a plurality of extrusion guns (8) and a scraper (9). The kettle wall of the stirring kettle (7) is provided with a heating chamber. A heating rod for maintaining the temperature of the stirring kettle (7) is arranged in the heating chamber. The extrusion amount of the plurality of extrusion guns (8) is controlled by a program. When the plurality of extrusion guns (8) are placed above the depression of the rubber film, the extrusion amount is greater than that of other areas. The scraper (9) is welded and fixed on the side walls of the plurality of extrusion guns (8).

6. The method for preparing an electromagnetic shielding composite fabric based on graphene textile material according to claim 5, characterized in that: The flipping device comprises a rotatably connected storage rack (10) and two flipping parts slidably connected to the storage rack (10), the flipping part comprises a conveying traction belt (11) and an attraction frame (12), the top surface of the conveying traction belt (11) located at the bottom is flush with the conveying belt, the attraction frame (12) is fixed to the side wall of the conveying traction belt (11), and a plurality of air holes (13) are provided on the attraction frame (12), and the plurality of air holes (13) are used to adsorb and fix the rubber film on the attraction frame (12), after the rubber film is fixed, the storage rack (10) is rotated 180 degrees so that the rubber film is located at the top, and the attraction frame (12) slides downward to cover the rubber film at the bottom.

7. The method for preparing an electromagnetic shielding composite fabric based on graphene textile material according to claim 6, characterized in that: The rubber film is conveyed in both the oven 1 (15) and the oven 2 (16) by means of a roller conveyor (14); the squeezing roller 1 (18) is arranged between the oven 1 (15) and the oven 2 (16); the temperature of the oven 1 (15) is set at 80 degrees, and the temperature of the oven 2 (16) is set at two levels of 120 degrees and 150 degrees respectively; the top and bottom surfaces of the oven 2 (16) are provided with a plurality of fans (17) arranged in an array, and the openings of the fans (17) face the oven 1 (15); the rollers on the roller conveyor (14) are coated with a nano anti-stick coating; and the bottom surface of the oven 2 (16) is provided with a storage box for collecting melted rubber film.

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