Composite graphene fabric, its preparation method, and its application in down jackets

Abstract

This invention relates to composite graphene fabric, its preparation method, and its application in down jackets. The fabric comprises a bottom layer, a middle layer, and a top layer that are sequentially heat-pressed and fixedly connected. The middle layer includes a connecting layer one and a connecting layer two, respectively disposed on opposite sides of the bottom and middle layers. Each of the opposite sides of connecting layer one and connecting layer two has a plurality of concave portions, and the concave portions of connecting layer one and connecting layer two correspond vertically. This invention utilizes a central reinforcing protrusion, a winding rib, a reinforcing rib one, and a reinforcing rib two formed between connecting layer one and connecting layer two, which work together to create a middle layer with good structural stability. This significantly improves the fabric's transverse and longitudinal tear resistance, shrinkage resistance, and down-proof performance. Using this fabric as a down jacket material allows the resulting down jacket to possess good tear resistance, shrinkage resistance, and down-proof performance.

Description

Technical Field

[0001] This invention belongs to the field of clothing fabric technology, specifically relating to composite graphene fabrics, their preparation methods, and their application in down jackets. Background Technology

[0002] Graphene fabric is typically made by spraying graphene coating onto the surface of the fabric or the fiber yarn, and then drying it to obtain a graphene coating. Graphene has unique antibacterial and bacteriostatic functions. For down jackets, during the wearing process, factors such as body temperature, humidity, dander, and sweat can easily create a warm and humid environment. Such an environment provides favorable conditions for the growth of microorganisms such as bacteria and mold. Graphene antibacterial fabric can effectively inhibit the growth of these microorganisms, keep the clothing clean and hygienic, and thus protect the wearer's health.

[0003] For graphene fabrics used in down jackets, they also need to have good down-proof, tear-resistant, and shrink-resistant properties so that during daily wear and washing, the down jacket fabric can be reduced or avoided from deforming or tearing, which would lead to a large amount of down leakage. Therefore, we provide a composite graphene fabric, its preparation method, and its application in down jackets to solve the above-mentioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide composite graphene fabric, its preparation method, and its application in down jackets in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] A composite graphene fabric includes a bottom layer, a middle layer, and a top layer that are sequentially heat-pressed and fixed together.

[0007] The middle layer includes a connecting layer one and a connecting layer two respectively disposed on opposite sides of the bottom layer and the middle layer. Each of the opposite sides of the connecting layer one and the connecting layer two has a plurality of recesses, and the recesses of the connecting layer one and the connecting layer two are vertically aligned. The inner walls of the recesses of the connecting layer one and the connecting layer two are provided with a central reinforcing protrusion. The two side walls of the central reinforcing protrusion are provided with a plurality of vertically staggered fiber lines with graphene coating.

[0008] A winding rib is provided in the middle of the interlaced fiber lines on the same side wall of the central reinforcing protrusion. The fiber lines are wrapped and fixed on the outer wall of the winding rib to form a graphene roll. The graphene roll and the front and rear ends of the winding rib are respectively hot-pressed and fixed to the side and front and rear end surfaces of the central reinforcing protrusion.

[0009] As a further optimization of the present invention, several reinforcing ribs are horizontally penetrating from front to back inside the central reinforcing protrusion, and the two sides of the reinforcing ribs are respectively hot-pressed and fixed between the connecting layer one and the connecting layer two.

[0010] As a further optimization of the present invention, the central reinforcing protrusion is provided with reinforcing ribs at both ends. The front and rear ends of the winding shaft ribs are respectively wound around the outer wall of the reinforcing ribs to form reinforcing rolls. The reinforcing rolls are hot-pressed and fixed to the front / rear end faces of the central reinforcing protrusion.

[0011] As a further optimization of the present invention, the connecting layer one, connecting layer two, central reinforcing protrusion, fiber line, winding shaft rib, reinforcing rib one, and reinforcing rib two are all made of polypropylene material.

[0012] A method for preparing a composite graphene fabric, comprising the following steps:

[0013] Step 1: A connecting layer 1 and a connecting layer 2 are integrally extruded on the bottom and middle layers respectively using a mold. Both connecting layer 1 and connecting layer 2 have concave portions. A central reinforcing protrusion with several reinforcing ribs 1 is integrally extruded on the inner wall of the concave portions of connecting layer 1 and connecting layer 2 using a mold. Several reinforcing ribs 1 are horizontally inserted through the central reinforcing protrusion from front to back. Several vertically staggered fiber lines are integrally extruded on both sides of the central reinforcing protrusion using a mold. Graphene coating is sprayed on the surface of the fiber lines to form a graphene coating and to obtain the winding shaft ribs.

[0014] Step 2: Place the heated 90-95℃ winding shaft rib in the middle of the fiber line on one side wall of the central reinforcing protrusion, press and roll the winding shaft rib to make the fiber line wrap around and fix it on the outer wall of the winding shaft rib to form a graphene roll. Then, hot press treatment is performed to fix the graphene roll and the front and rear ends of the winding shaft rib to the side of the central reinforcing protrusion and the front and rear end surfaces, respectively.

[0015] Step 3: Place the top layer on top of the bottom layer, with the concave portions of connecting layer 1 and connecting layer 2 corresponding vertically. Place the two sides of reinforcing rib 1 between connecting layer 1 and connecting layer 2 on both sides of the concave portion. Perform hot pressing treatment on connecting layer 1, connecting layer 2, and the corresponding bottom and top layers above and below them to connect and fix them together to obtain the composite graphene fabric.

[0016] As a further optimization of the present invention, in step one, when the central reinforcing protrusion and the first reinforcing rib are integrally extruded on the inner wall of the concave portion of the connecting layer one and the connecting layer two by means of a mold, the second reinforcing rib is integrally extruded on the front and rear end faces of the central reinforcing protrusion by means of a mold.

[0017] In step two, after the graphene roll is formed, the front and rear ends of the winding shaft are respectively wrapped around the outer walls of the reinforcing ribs at the front and rear ends of the central reinforcing protrusion to form a reinforcing roll. Then, hot pressing is performed to fix the graphene roll, the reinforcing roll, and the front and rear ends of the winding shaft to the side and front and rear end surfaces of the central reinforcing protrusion.

[0018] As a further optimization of the present invention, in step two, the pressure of the hot pressing treatment is 2-4 MPa, the temperature is 140-150℃, the number of hot pressing cycles is 3-5, and the hot pressing time for each cycle is 4-7 min.

[0019] As a further optimization of the present invention, in step three, the pressure of the hot pressing treatment is 5-8 MPa, the temperature is 130-140℃, the number of hot pressing cycles is 3-5, and the hot pressing time for each cycle is 3-7 min.

[0020] An application of composite graphene fabric in down jackets, wherein the outer layer of the down jacket is the aforementioned composite graphene fabric.

[0021] The beneficial effects of this invention are as follows:

[0022] 1) The present invention uses the central reinforcing protrusion, the winding shaft rib, the first reinforcing rib, and the second reinforcing rib formed between the connecting layer one and the connecting layer two in combination to make the middle layer have good structural stability, thereby significantly improving the tear resistance and shrinkage resistance of the fabric in both the transverse and longitudinal directions, and also improving the down-proof effect of the fabric. Using this fabric as the outer layer of down jackets, the down jackets prepared can have good tear resistance, shrinkage resistance, and down-proof performance.

[0023] 2) The present invention improves the overall stability of the middle layer by using the central reinforcing protrusion to form a better reinforcement effect in the concave part, and the structural design of the fiber lines winding on the outer wall of the winding shaft to form a graphene roll layer and the structural design of the fiber lines winding on the second reinforcing rib to form a reinforcing roll layer. On this basis, the structural design of the first and second reinforcing ribs being pressed together between the first and second connecting layers further improves the overall stability of the middle layer, while improving the tear resistance and shrinkage resistance of the fabric in both the transverse and longitudinal directions.

[0024] 3) The present invention increases the spatial complexity of the cavity formed by the concave part between the connecting layer one and the connecting layer two by using the central reinforcing protrusion, the winding shaft rib, the first reinforcing rib and the second reinforcing rib in combination. On this basis, a stable and non-deformable upper and lower traction support structure is also formed in the cavity, so that the anti-down leakage effect of the fabric is maintained for a longer period of time. Attached Figure Description

[0025] Figure 1 This is a cross-sectional schematic diagram of the composite graphene fabric of Embodiment 1 of the present invention.

[0026] Figure 2 This is a cross-sectional schematic diagram of the middle layer of the composite graphene fabric in Embodiment 1 of the present invention.

[0027] Figure 3 This is a cross-sectional schematic diagram of the middle layer of the composite graphene fabric in Embodiment 2 of the present invention.

[0028] Figure 4 This is a top view schematic diagram of the middle layer of the composite graphene fabric in Embodiment 2 of the present invention.

[0029] Figure 5 This is a cross-sectional schematic diagram of the middle layer of the composite graphene fabric of Comparative Example 1 of the present invention.

[0030] Figure 6 This is a cross-sectional schematic diagram of the middle layer of the composite graphene fabric of Comparative Example 2 of the present invention.

[0031] Figure 7 This is a cross-sectional schematic diagram of the middle layer of the composite graphene fabric of Comparative Example 3 of the present invention.

[0032] In the diagram: 1. Bottom layer; 2. Middle layer; 21. Connecting layer one; 22. Connecting layer two; 23. Central reinforcing protrusion; 24. Fiber lines; 25. Wrapped shaft ribs; 26. Reinforcing rib one; 27. Reinforcing rib two; 3. Top layer. Detailed Implementation

[0033] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0034] I. Materials

[0035] 1. In this application, the bottom layer (1) is commercially available pure cotton fabric, and the top layer (3) is commercially available 180T spring spun fabric.

[0036] Unless otherwise specified, the methods used in this embodiment are conventional methods known to those skilled in the art, and the reagents and materials used are commercially available products.

[0037] II. Methods

[0038] To investigate the effects of different structural designs of the middle layer 2 on the shrinkage resistance, tear resistance, and down-proof properties of the composite graphene fabric, the following technical solutions were designed in Examples 1-2 and Comparative Examples 1-3, as detailed below:

[0039] Example 1

[0040] like Figure 1 , 2 As shown, the composite graphene fabric includes a bottom layer 1, a middle layer 2, and a top layer 3 that are sequentially heat-pressed and fixed together.

[0041] The middle layer 2 includes a connecting layer 1 21 and a connecting layer 22 respectively disposed on opposite sides of the bottom layer 1 and the middle layer 2. Each of the opposite sides of the connecting layer 1 21 and the connecting layer 22 has a plurality of recesses, and the recesses of the connecting layer 1 21 and the connecting layer 22 are vertically aligned. The inner walls of the recesses of the connecting layer 1 21 and the connecting layer 22 are provided with a central reinforcing protrusion 23. The two side walls of the central reinforcing protrusion 23 are provided with a plurality of vertically staggered fiber lines 24 with graphene coating.

[0042] A winding rib 25 is provided in the middle of the interlaced fiber lines 24 on the same side wall of the central reinforcing protrusion 23. The fiber lines 24 are wrapped and fixed on the outer wall of the winding rib 25 to form a graphene roll. The graphene roll and the front and rear ends of the winding rib 25 are respectively hot-pressed and fixed on the side and front and rear end surfaces of the central reinforcing protrusion 23.

[0043] Preferably, a plurality of reinforcing ribs 26 are horizontally penetrating from front to back inside the central reinforcing protrusion 23, and the two sides of the reinforcing ribs 26 are respectively hot-pressed and fixed between the connecting layer 21 and the connecting layer 22.

[0044] In this embodiment, the connecting layer 21, connecting layer 22, central reinforcing protrusion 23, fiber strip 24, winding shaft rib 25, and reinforcing rib 26 are all made of polypropylene material.

[0045] A method for preparing a composite graphene fabric, the specific steps of which are as follows:

[0046] Step 1: A connecting layer 1 21 and a connecting layer 22 are integrally extruded on the surfaces of the bottom layer 1 and the middle layer 2 using a mold. Both the connecting layer 1 21 and the connecting layer 22 have concave portions. A central reinforcing protrusion 23 with several reinforcing ribs 26 is integrally extruded on the inner wall of the concave portions of the connecting layer 1 21 and the connecting layer 22 using a mold. Several reinforcing ribs 26 are horizontally penetrating the central reinforcing protrusion 23 from front to back. Several vertically staggered fiber lines 24 are integrally extruded on both sides of the central reinforcing protrusion 23 using a mold. Graphene coating is sprayed onto the surface of the fiber lines 24 to form a graphene coating, and a winding shaft rib 25 is prepared.

[0047] Step 2: Place the heated 92°C winding shaft rib 25 in the middle of the fiber line 24 on one side wall of the central reinforcing protrusion 23, press and roll the winding shaft rib 25 so that the fiber line 24 is wrapped and fixed on the outer wall of the winding shaft rib 25 to form a graphene roll. Then, hot pressing is performed to fix the graphene roll and the front and rear ends of the winding shaft rib 25 to the side and front and rear end surfaces of the central reinforcing protrusion 23, respectively.

[0048] In step two of this embodiment, the pressure of the hot pressing treatment is 3 MPa, the temperature is 143°C, the number of hot pressing cycles is 4, and the hot pressing time for each cycle is 5 min.

[0049] Step 3: Place the top layer 3 on top of the bottom layer 1, with the concave portions of connecting layer 1 21 and connecting layer 22 corresponding vertically. Place the reinforcing ribs 1 26 on both sides between connecting layer 1 21 and connecting layer 22 on both sides of the concave portions. Perform hot pressing treatment on connecting layer 1 21, connecting layer 22, and the corresponding bottom layer 1 and top layer 3 above and below them to connect and fix them together, thus obtaining the composite graphene fabric.

[0050] In step three of this embodiment, the pressure of the hot pressing treatment is 7 MPa, the temperature is 135°C, the number of hot pressing cycles is 4, and the hot pressing time for each cycle is 6 minutes.

[0051] A down jacket, wherein the outer layer of the down jacket is the aforementioned composite graphene fabric.

[0052] Example 2

[0053] like Figure 1 , 3 As shown in Figure 4, a composite graphene fabric, based on Example 1, in this embodiment, the front and rear ends of the central reinforcing protrusion 23 are provided with reinforcing ribs 27, and the front and rear ends of the winding shaft ribs 25 are respectively wound around the outer wall of the reinforcing ribs 27 to form reinforcing rolls, and the reinforcing rolls are hot-pressed and fixed on the front / rear end faces of the central reinforcing protrusion 23.

[0054] A method for preparing a composite graphene fabric, the specific steps of which are as follows:

[0055] Step 1: A connecting layer 1 21 and a connecting layer 22 are integrally extruded on the surfaces of the bottom layer 1 and the middle layer 2 using a mold. Both the connecting layer 1 21 and the connecting layer 22 have concave portions. A central reinforcing protrusion 23 with several reinforcing ribs 1 26 and two reinforcing ribs 27 is integrally extruded on the inner wall of the concave portions of the connecting layer 1 21 and the connecting layer 22 using a mold. Several reinforcing ribs 1 26 pass horizontally through the central reinforcing protrusion 23 from front to back. The two reinforcing ribs 27 are located on the front and rear end faces of the central reinforcing protrusion 23, respectively. Several vertically staggered fiber lines 24 are integrally extruded on the two side walls of the central reinforcing protrusion 23 using a mold. Graphene coating is sprayed onto the surface of the fiber lines 24 to form a graphene coating, and a winding shaft rib 25 is prepared.

[0056] Step 2: Place the heated 92°C winding shaft rib 25 in the middle of the fiber line 24 on one side wall of the central reinforcing protrusion 23, press and roll the winding shaft rib 25 so that the fiber line 24 is wrapped and fixed on the outer wall of the winding shaft rib 25 to form a graphene roll. Wrap the front and rear ends of the winding shaft rib 25 around the outer wall of the reinforcing rib 27 at the front and rear ends of the central reinforcing protrusion 23 to form a reinforcing roll. Then, perform hot pressing to fix the graphene roll, the reinforcing roll, and the front and rear ends of the winding shaft rib 25 to the side and front and rear end surfaces of the central reinforcing protrusion 23 respectively.

[0057] In step two of this embodiment, the pressure of the hot pressing treatment is 3 MPa, the temperature is 143°C, the number of hot pressing cycles is 4, and the hot pressing time for each cycle is 5 min.

[0058] Step 3: Place the top layer 3 on top of the bottom layer 1, with the concave portions of connecting layer 1 21 and connecting layer 22 corresponding vertically. Place the reinforcing ribs 1 26 on both sides between connecting layer 1 21 and connecting layer 22 on both sides of the concave portions. Perform hot pressing treatment on connecting layer 1 21, connecting layer 22, and the corresponding bottom layer 1 and top layer 3 above and below them to connect and fix them together, thus obtaining the composite graphene fabric.

[0059] In step three of this embodiment, the pressure of the hot pressing treatment is 7 MPa, the temperature is 135°C, the number of hot pressing cycles is 4, and the hot pressing time for each cycle is 6 minutes.

[0060] A down jacket, wherein the outer layer of the down jacket is the aforementioned composite graphene fabric.

[0061] Comparative Example 1

[0062] like Figure 5As shown, a composite graphene fabric differs from Example 2 in that the middle layer 2 in this comparative example does not have the structural design of reinforcing rib 1 26 and reinforcing rib 27, that is, it does not have the structural design of the front and rear ends of the winding shaft rib 25 being wound around the two reinforcing ribs 27 to form a reinforcing roll layer. All other aspects are consistent with Example 2.

[0063] Comparative Example 2

[0064] like Figure 6 As shown, a composite graphene fabric differs from Example 2 in that, in this comparative example, the middle layer 2 does not have the structural design of the winding shaft rib 25 and the first reinforcing rib 26 and the second reinforcing rib 27. That is, it does not have the structural design of the front and rear ends of the winding shaft rib 25 being wound around the two second reinforcing ribs 27 to form a reinforced roll layer, nor does it have the structural design of winding the fiber lines 24 to form a graphene roll layer. In addition, the fiber lines 24 also have a graphene coating as in Example 2. Everything else is consistent with Example 2.

[0065] Comparative Example 3

[0066] like Figure 7 As shown, a composite graphene fabric differs from Example 2 in that, in this comparative example, the middle layer 2 does not have the structural design of the central reinforcing protrusion 23, the winding shaft rib 25, and the first reinforcing rib 26 and the second reinforcing rib 27. That is, the fiber lines 24 are directly distributed on the inner walls of the first connecting layer 21 and the second connecting layer 22, and the fiber lines 24 also have a graphene coating as in Example 2. The rest is consistent with Example 2.

[0067] III. Performance Testing Experiment

[0068] The following data on the transverse shrinkage performance test of the fabric are as follows: Figure 1 The data for the longitudinal shrinkage performance test of the fabric shown are as follows: (The left and right sides of the fabric are shown.) Figure 1 The front and back sides of the fabric shown.

[0069] Shrinkage performance test: Fold the sample in half and sew it closed with polyester thread. Make a cross mark in both the length and width directions, and record the longitudinal and transverse dimensions L0 before shrinkage. At room temperature, place the sample in a washing machine for 5 hours of continuous washing, then remove it and dry it flat in a 50℃ oven. Record the longitudinal and transverse dimensions L1. Calculate the shrinkage rate of the sample based on L0 and L1 and statistically analyze the results. The calculation formula is as follows: [(L0-L1) / L0]×100%. The test data are shown in Table 1.

[0070] Table 1. Data Recording Table for Shrinkage Performance Test

[0071]

[0072] Experimental Results: As shown in Table 1, the fabrics of Examples 1-2 have better shrinkage resistance than the fabrics of Comparative Examples 1-3. Analysis reveals that the central reinforcing protrusion 23 provides better reinforcement in the concave portion, thereby improving the shrinkage resistance of the fabric. The structural design of the fiber strips 24 winding around the outer wall of the winding shaft rib 25 to form a graphene roll layer, and the structural design of the fiber strips 24 winding around the reinforcing rib 27 to form a reinforcing roll layer, improves the overall structural stability of the middle layer 2, further enhancing the shrinkage resistance of the fabric. On this basis, the structural design of the reinforcing rib 1 26 and the reinforcing rib 27 being pressed between the connecting layer 1 21 and the connecting layer 22 further enhances the overall structural stability of the middle layer 2, significantly improving the shrinkage resistance of the fabric, and simultaneously improving the shrinkage resistance of the fabric in both the transverse and longitudinal directions.

[0073] The following data on the transverse tear resistance test of the fabric are based on tensile strength. Figure 1 The data for the longitudinal tear resistance test of the fabric shown are as follows: (The data is missing from the provided text.) Figure 1 The front and back sides of the fabric shown.

[0074] Tear Resistance Test: Experimental Equipment: Q800 Dynamic Mechanical Analyzer (DMA, TA Instruments, USA); Experimental Method: Waterproof and tear-resistant carbon fiber fabrics from Examples 1-2 and Comparative Examples 1-2 were used as samples. The sample specifications were strips of 220×200mm. The samples were placed in a tensile fixture, with one end fixed and the other end movable with the fixture. The temperature was 22℃±3℃, the frequency was set to 3Hz, and the applied stress was gradually increased from 0 at a rate of 5MPa / s. The strain change of the sample was recorded until the sample broke. The stress at the fracture point was taken as the tensile strength of the sample. The test data are shown in Table 2.

[0075] Table 2. Tear Resistance Test Data Recording Table

[0076]

[0077]

[0078] Experimental Results: As shown in Table 2, the fabrics of Examples 1-2 all have good tear resistance. By comparing the middle layer 2 of the fabric of Example 2 with the middle layer 2 of the fabrics of Comparative Examples 1-3, it can be seen that the middle layer 2 formed by the combined use of the central reinforcing protrusion 23, the winding shaft rib 25, the first reinforcing rib 26, and the second reinforcing rib 27 has good structural stability, thereby significantly improving the tear resistance of the fabric in both the transverse and longitudinal directions.

[0079] The fabrics used in the following down-proof performance tests were the unwashed composite graphene fabrics of Examples 1-2 and Comparative Examples 1-3, and the composite graphene fabrics that were washed 30 times (30 washes in a drum washing machine at a speed of 1400 r / min, with each wash lasting 24 min).

[0080] Down-proof performance test: The down-proof performance of the fabric was tested according to the national standard GB / T12705.2-2009 "Textiles - Test Method for Down-proof Performance of Fabrics - Part 2: Rotating Box Method". When the number of down threads is >15, the down-proof performance is poor; when 5 < down thread count ≤15, it has down-proof performance; when the number of down threads is ≤5, it has good down-proof performance. The test data are shown in Table 3.

[0081] Table 3. Test data on down-proof performance.

[0082]

[0083]

[0084] Experimental Results: Table 3 shows that the fabrics of Examples 1-2 all have good down-proof effects, and the fabrics can still maintain good down-proof effects after multiple washes. Through structural analysis of the middle layer 2 of the fabric of Example 2, it can be seen that the combined use of the middle reinforcing protrusion 23, the winding shaft rib 25, the first reinforcing rib 26, and the second reinforcing rib 27 increases the spatial complexity of the cavity formed by the concave part between the first connecting layer 21 and the second connecting layer 22. On this basis, a stable and non-deformable upper and lower traction support structure is also formed in the cavity, so that the down-proof effect of the fabric is maintained for a longer period of time.

[0085] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A composite graphene fabric, characterized in that: It includes a bottom layer (1), a middle layer (2), and a top layer (3) that are sequentially hot-pressed and fixedly connected. The middle layer (2) includes a connecting layer one (21) and a connecting layer two (22) respectively disposed on opposite sides of the bottom layer (1) and the middle layer (2). The opposite sides of the connecting layer one (21) and the connecting layer two (22) each have a number of recesses and the recesses of the connecting layer one (21) and the connecting layer two (22) correspond vertically. The inner walls of the recesses of the connecting layer one (21) and the connecting layer two (22) each have a central reinforcing protrusion (23). The two side walls of the central reinforcing protrusion (23) each have a number of vertically interleaved fiber lines (24) with graphene coating. A winding rib (25) is provided in the middle of the interlaced fiber lines (24) on the same side wall of the central reinforcing protrusion (23). The fiber lines (24) are wrapped and fixed on the outer wall of the winding rib (25) to form a graphene roll. The graphene roll and the winding rib (25) are hot-pressed and fixed at the front and rear ends of the central reinforcing protrusion (23) and the front and rear end surfaces, respectively. The central reinforcing protrusion (23) has several reinforcing ribs (26) running horizontally from front to back inside. The two sides of the reinforcing ribs (26) are respectively hot-pressed and fixed between the connecting layer (21) and the connecting layer (22). The central reinforcing protrusion (23) is provided with reinforcing ribs (27) at both ends. The front and rear ends of the winding shaft rib (25) are respectively wound around the outer wall of the reinforcing rib (27) to form a reinforcing roll layer. The reinforcing roll layer is hot-pressed and fixed on the front / rear end face of the central reinforcing protrusion (23).

2. The composite graphene fabric according to claim 1, characterized in that: The connecting layer one (21), connecting layer two (22), central reinforcing protrusion (23), fiber line (24), winding shaft rib (25), reinforcing rib one (26), and reinforcing rib two (27) are all made of polypropylene material.

3. A method for preparing a composite graphene fabric as described in any one of claims 1-2, characterized in that: The specific steps are as follows: Step 1: A connecting layer 1 (21) and a connecting layer 2 (22) are integrally extruded on the surfaces of the bottom layer (1) and the middle layer (2) respectively using a mold. Both the connecting layer 1 (21) and the connecting layer 2 (22) have concave portions. A central reinforcing protrusion (23) with several reinforcing ribs 1 (26) is integrally extruded on the inner wall of the concave portions of the connecting layer 1 (21) and the connecting layer 2 (22) using a mold. Several reinforcing ribs 1 (26) are horizontally penetrating the central reinforcing protrusion (23) from front to back. Several fiber lines (24) are integrally extruded on both sides of the central reinforcing protrusion (23) using a mold. Graphene coating is sprayed on the surface of the fiber lines (24) to form a graphene coating and a winding shaft rib (25) is prepared. Step 2: Place the heated spool (25) to 90-95℃ in the middle of the fiber line (24) on one side wall of the central reinforcing protrusion (23), press and roll the spool (25) so that the fiber line (24) is wrapped and fixed on the outer wall of the spool (25) to form a graphene roll. Then, hot press treatment is performed to fix the graphene roll and the front and rear ends of the spool (25) to the side and front and rear ends of the central reinforcing protrusion (23) respectively. Step 3: Place the top layer (3) on top of the bottom layer (1), with the concave portions of connecting layer 1 (21) and connecting layer 2 (22) corresponding vertically. Place the reinforcing ribs 1 (26) on both sides between connecting layer 1 (21) and connecting layer 2 (22) on both sides of the concave portion. Then, heat-press the connecting layer 1 (21) with reinforcing ribs 1 (26), connecting layer 2 (22) with the corresponding bottom layer (1) and top layer (3) above and below them together to connect and fix them together to obtain the composite graphene fabric.

4. The method for preparing the composite graphene fabric according to claim 3, characterized in that: In step one, when the central reinforcing protrusion (23) and the first reinforcing rib (26) are integrally extruded on the inner wall of the concave part of the connecting layer one (21) and the connecting layer two (22) by the mold, the second reinforcing rib (27) is integrally extruded on the front and rear end faces of the central reinforcing protrusion (23) by the mold. In step two, after the graphene roll is formed, the front and rear ends of the winding shaft rib (25) are respectively wrapped around the outer wall of the reinforcing rib (27) at the front and rear ends of the central reinforcing protrusion (23) to form a reinforcing roll. Then, the graphene roll, the reinforcing roll, and the front and rear ends of the winding shaft rib (25) are fixed to the side and front and rear ends of the central reinforcing protrusion (23) respectively by hot pressing.

5. The method for preparing the composite graphene fabric according to claim 4, characterized in that: In step two, the pressure of the hot pressing treatment is 2-4 MPa, the temperature is 140-150℃, the number of hot pressing cycles is 3-5, and the hot pressing time for each cycle is 4-7 min.

6. The method for preparing the composite graphene fabric according to claim 3, characterized in that: In step three, the hot pressing pressure is 5-8 MPa, the temperature is 130-140℃, the number of hot pressing cycles is 3-5, and the hot pressing time for each cycle is 3-7 min.

7. The application of a composite graphene fabric in down jackets, characterized in that: The outer fabric of the down jacket is a composite graphene fabric as described in any one of claims 1-2.

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