Hollow carbon fiber tube

Abstract

The present invention provides a hollow carbon fiber tube formed by winding a composite material body. The composite material body includes a plurality of carbon fiber prepreg layers and at least one graphene-containing resin layer. Each of the at least one graphene-containing resin layer is disposed between two adjacent carbon fiber prepreg layers. The total thickness of the at least one graphene-containing resin layer is 1 / 15 to 1 / 3 of the thickness of the composite material body.

Description

Technical Field

[0001] The present invention relates to a hollow carbon fiber tube having torsional vibration suppression characteristics. Background Art

[0002] Since products made of polymer fiber composites have characteristics such as lightweight, high mechanical strength, and high design freedom, it has become an inevitable development trend to combine various functional characteristics and uses in polymer fiber composite structures.

[0003] Polymer fiber composite products are developing towards being thinner, lighter, shorter, and smaller, so the structural design focuses on high mechanical strength. However, materials with higher mechanical strength often have an increase in brittleness, resulting in fracture due to the increase in brittleness after the material is torsionally stressed. Therefore, improving the damping characteristics of the material to increase the torsional vibration suppression effect has become an important topic. Summary of the Invention

[0004] The present invention is directed to a hollow carbon fiber tube, which includes a carbon fiber prepreg layer to provide an effect of suppressing torsional vibration.

[0005] According to an embodiment of the present invention, the hollow carbon fiber tube is formed by winding a composite material body. The composite material body includes a plurality of carbon fiber prepreg layers and at least one graphene-containing resin layer. The at least one graphene-containing resin layer is disposed between two adjacent carbon fiber prepreg layers. The total thickness of the at least one graphene-containing resin layer is 1 / 15 to 1 / 3 of the thickness of the composite material body.

[0006] To make the present invention more obvious and understandable, specific embodiments are given below and described in detail in conjunction with the accompanying drawings. Description of the Drawings

[0007] Figure 1 A three-dimensional schematic diagram of the hollow carbon fiber tube according to an embodiment of the present invention;

[0008] Figure 2 is Figure 1 A side view schematic diagram of the hollow carbon fiber tube from the end;

[0009] Figures 3 to 8 A cross-sectional schematic diagram of the hollow carbon fiber tube according to different embodiments of the present invention;

[0010] Figure 9 A schematic diagram for explaining the graphene position parameter of the hollow carbon fiber tube. Detailed Description of the Invention

[0011] Examples will be listed below and described in detail with reference to the accompanying drawings. However, the provided examples are not intended to limit the scope covered by the present invention. In addition, the drawings are for illustrative purposes only and are not drawn to the original scale. For the convenience of understanding, the same components will be denoted by the same reference numerals in the following description.

[0012] Regarding the terms "comprising", "including", "having", etc. used herein, they are all open-ended terms, that is, "including but not limited to".

[0013] When components are described using terms such as "first", "second", etc., they are only used to distinguish these components from each other and do not limit the order or importance of these components. Therefore, in some cases, the first component can also be called the second component, and the second component can also be called the first component, and this does not deviate from the scope of the present invention.

[0014] In addition, in this article, a range represented by "a numerical value to another numerical value" is a summary representation method to avoid listing all the numerical values in the range in the specification one by one. Therefore, the description of a specific numerical range covers any numerical value within the said numerical range, and covers a smaller numerical range defined by any numerical value within the said numerical range.

[0015] The hollow carbon fiber tube of the embodiment of the present invention is formed by winding a composite material body, and the composite material body includes a plurality of carbon fiber prepreg layers and a graphene-containing resin layer disposed between two adjacent carbon fiber prepreg layers. When the hollow carbon fiber tube of the embodiment of the present invention is subjected to torsional force, micro-sliding phenomena will occur between the layer walls of the graphene in the graphene-containing resin layer, and the accumulated micro-sliding can rapidly amplify the damping characteristics of the composite material body, thereby achieving the effect of suppressing torsional vibration, that is, having a better damping ratio (δ). Therefore, the hollow carbon fiber tube of the embodiment of the present invention is suitable as a component of a handling device (such as a robotic arm) to extend the service life of the handling device. The hollow carbon fiber tube of the embodiment of the present invention will be described in detail below.

[0016] Figure 1 It is a three-dimensional schematic diagram of the hollow carbon fiber tube of the embodiment of the present invention. Figure 2 is Figure 1 The side view schematic diagram of the hollow carbon fiber tube from the end. At the same time, referring to Figure 1 and Figure 2 , the hollow carbon fiber tube 10 of the embodiment of the present invention is formed by winding a composite material body 100. In this embodiment, the hollow carbon fiber tube 10 is a cylindrical tube. In other embodiments, the hollow carbon fiber tube 10 can be an oval tube, a rectangular tube, a triangular tube or other polygonal tubes.

[0017] In this embodiment, the composite material body 100 includes a plurality of carbon fiber prepreg layers 102 and a graphene-containing resin layer 104 in its thickness direction. The graphene-containing resin layer 104 is disposed between two adjacent carbon fiber prepreg layers 102. In this embodiment, the composite material body 100 includes 7 stacked carbon fiber prepreg layers 102, but the embodiments of the present invention are not limited thereto. In addition, the graphene-containing resin layer 104 is disposed between the two outermost carbon fiber prepreg layers 102, but the embodiments of the present invention are not limited thereto.

[0018] The carbon fiber prepreg layer 102 includes a resin material and a carbon fiber layer impregnated in the resin material. In this embodiment, the resin material may be a thermoplastic material or a thermosetting material. The thermoplastic material may be polycarbonate, nylon, polypropylene, polyphenylene sulfide, or polyether ether ketone. The thermosetting material may be an epoxy resin. The detailed structure of the carbon fiber prepreg layer 102 is well known to those skilled in the art, and for the sake of clarity of the drawings, Figure 1 and Figure 2 the resin material and the carbon fiber layer are not shown in detail in the

[0019] The graphene-containing resin layer 104 includes a resin material and graphene contained in the resin material. In this embodiment, the resin material may be the above-mentioned thermoplastic material or thermosetting material. In addition, the resin material of the graphene-containing resin layer 104 may be the same as or different from the resin material of the carbon fiber prepreg layer 102. The graphene may have 30m 2 / g to 500m 2Specific surface area per g. In this range, the micro-sliding phenomenon between the layer walls of the graphene-containing resin layer 104 can effectively amplify the damping characteristics of the composite body 100. The thickness of the graphene-containing resin layer 104 is, for example, 5 μm to 200 μm. In the graphene-containing resin layer 104, the content of graphene is, for example, 0.5 wt% to 5 wt% or 1 wt% to 3 wt% based on the total weight of the graphene-containing resin layer 104. When the content of graphene is less than 0.5 wt%, the graphene-containing resin layer 104 cannot effectively improve the damping characteristics of the composite body 100. When the content of graphene is greater than 5 wt%, the damping characteristics of the composite body 100 cannot be further improved, and its mechanical strength will be reduced accordingly. In addition, the surface of graphene can be modified to have reactive functional groups to improve the dispersibility of graphene in the resin material. The reactive functional groups can be amino groups, carboxyl groups, hydroxyl groups, acyl chloride groups or combinations thereof. The method for modifying the surface of graphene can refer to the method disclosed in J.mater.Chem., 2011, 21, 7337 - 7342.

[0020] In addition, in the composite body, the total thickness of the graphene-containing resin layer is 1 / 15 to 1 / 3 of the thickness of the composite body. In this embodiment, the composite body 100 only includes one graphene-containing resin layer 104, so the thickness of the graphene-containing resin layer 104 is 1 / 15 to 1 / 3 of the thickness of the composite body 100. When the total thickness of the graphene-containing resin layer is less than 1 / 15 of the thickness of the composite body 100, the graphene-containing resin layer cannot effectively improve the damping characteristics of the composite body 100. When the total thickness of the graphene-containing resin layer is greater than 1 / 3 of the thickness of the composite body 100, the damping characteristics of the composite body 100 cannot be further improved, and its mechanical strength will be reduced accordingly.

[0021] In this embodiment, the graphene-containing resin layer 104 is disposed between two outermost carbon fiber prepreg layers 102, that is, the graphene-containing resin layer 104 is disposed adjacent to the outer surface of the hollow carbon fiber tube 10. In this case, the hollow carbon fiber tube 10 can be regarded as having an outer layer graphene design. In the case where the graphene-containing resin layer 104 is disposed away from the outer surface of the hollow carbon fiber tube 10, the hollow carbon fiber tube 10 can be regarded as having an inner layer graphene design. In addition, the graphene-containing resin layer 104 can also be disposed in the central part of the composite body 100.

[0022] In one embodiment, the outer layer graphene design and the inner layer graphene design can be defined in the following manner. In the hollow carbon fiber tube of the embodiment of the present invention, the center is defined as the center point C in the thickness direction of the composite body, as Figure 9As shown in the figure. The number of graphene-containing resin layers in the composite material body is n, and the distance from the i-th graphene-containing resin layer to the center point C is d(i). The distance from the graphene-containing resin layer adjacent to the outer surface of the hollow carbon fiber tube to the center point C is a positive value, and vice versa is a negative value. In addition, the graphene location index L of the hollow carbon fiber tube is calculated according to Equation (1).

[0023]

[0024] Taking Figure 9 the structure in

[0025] as an example, L = [d(1) + d(2) + d(3)] / 3. When L is greater than 0, the hollow carbon fiber tube 10 can be regarded as having an outer layer graphene design. When L is less than 0, the hollow carbon fiber tube 10 can be regarded as having an inner layer graphene design. Hereinafter, this method will be used to define the design type of the hollow carbon fiber tube, but the embodiments of the present invention are not limited thereto.

[0026] In the hollow carbon fiber tube 10, only one graphene-containing resin layer 104 is provided, and it is located between the two outermost carbon fiber prepreg layers 102. Therefore, n is 1 and d(1) of the graphene-containing resin layer 104 is greater than 0. Therefore, the graphene location parameter L of the hollow carbon fiber tube 10 is greater than 0, and it can be regarded as having an outer layer graphene design.

[0027] In the above embodiment, only one graphene-containing resin layer is provided in the hollow carbon fiber tube, but the embodiments of the present invention are not limited thereto. In other embodiments, multiple graphene-containing resin layers can be provided in the hollow carbon fiber tube, and these graphene-containing resin layers can be the same or different from each other. The following will describe these hollow carbon fiber tube designs, but the embodiments of the present invention are not limited to these embodiments.

[0028] Figures 3 to 8 is a schematic cross-sectional view of the hollow carbon fiber tube according to different embodiments of the present invention.

[0029] In Figure 3 the hollow carbon fiber tube 20 includes 7 carbon fiber prepreg layers 102 and 2 graphene-containing resin layers 104. In the hollow carbon fiber tube 20, one graphene-containing resin layer 104 is provided between the two outermost carbon fiber prepreg layers 102, and the other graphene-containing resin layer 104 is provided between the second carbon fiber prepreg layer 102 and the third carbon fiber prepreg layer 102 from the outside to the inside. In addition, based on the above Equation (1), the graphene location parameter L of the hollow carbon fiber tube 20 can be calculated to be greater than 0. Therefore, the hollow carbon fiber tube 20 can be regarded as having an outer layer graphene design.

[0030] In Figure 4 the hollow carbon fiber tube 30, compared with Figure 3The difference lies in that: One graphene-containing resin layer 104 is disposed between two carbon fiber prepreg layers 102 at the innermost layer, and another graphene-containing resin layer 104 is disposed between the second carbon fiber prepreg layer 102 and the third carbon fiber prepreg layer 102 from the inside to the outside. Based on the above formula (1), the graphene position parameter L of the hollow carbon fiber tube 30 can be calculated to be less than 0. Therefore, the hollow carbon fiber tube 30 can be regarded as having an inner layer graphene design.

[0031] In Figure 5 the hollow carbon fiber tube 40, compared with Figure 3 the difference lies in that: One graphene-containing resin layer 104 is disposed between two carbon fiber prepreg layers 102 at the outermost layer, one graphene-containing resin layer 104 is disposed in the central part of the composite material body 100, and one graphene-containing resin layer 104 is disposed between the central part and the inner surface of the hollow carbon fiber tube 40. Based on the above formula (1), the graphene position parameter L of the hollow carbon fiber tube 40 can be calculated to be greater than 0. Therefore, the hollow carbon fiber tube 40 can be regarded as having an outer layer graphene design.

[0032] In Figure 6 the hollow carbon fiber tube 50, compared with Figure 5 the difference lies in that: One graphene-containing resin layer 104 is disposed in the central part of the composite material body 100, and two graphene-containing resin layers 104 are disposed between the central part and the inner surface of the hollow carbon fiber tube 40. Based on the above formula (1), the graphene position parameter L of the hollow carbon fiber tube 50 can be calculated to be less than 0. Therefore, the hollow carbon fiber tube 50 can be regarded as having an inner layer graphene design.

[0033] In Figure 7 the hollow carbon fiber tube 60, compared with Figure 3 the difference lies in that: Two graphene-containing resin layers 104 are disposed between the central part of the composite material body 100 and the outer surface of the hollow carbon fiber tube 60, and two graphene-containing resin layers 104 are disposed between the central part and the inner surface of the hollow carbon fiber tube 60 and adjacent to the central part. Based on the above formula (1), the graphene position parameter L of the hollow carbon fiber tube 60 can be calculated to be greater than 0. Therefore, the hollow carbon fiber tube 60 can be regarded as having an outer layer graphene design.

[0034] In Figure 8 the hollow carbon fiber tube 70, compared with Figure 7 the difference lies in that: Two graphene-containing resin layers 104 are disposed between the central part of the composite material body 100 and the outer surface of the hollow carbon fiber tube 70 and adjacent to the central part, and two graphene-containing resin layers 104 are disposed between the central part and the inner surface of the hollow carbon fiber tube 70. Based on the above formula (1), the graphene position parameter L of the hollow carbon fiber tube 70 can be calculated to be less than 0. Therefore, the hollow carbon fiber tube 70 can be regarded as having an inner layer graphene design.

[0035] The torsional vibration damping effect of the hollow carbon fiber tube according to the embodiments of the present invention will be described below by means of simulation tests of experimental examples and comparative examples.

[0036] Test method

[0037] ANSYS Enterprise version 19.0 was used for simulation tests to simulate the displacement and time process of the vibration of the object and its energy attenuation. The preliminary boundary conditions for the simulation were that the bottom of the model was fixed in the X, Y, and Z directions so that it could not move, and a rotational angle of 1 degree in the X-axis direction was applied at the top. After the preliminary boundary conditions were applied, the aforementioned rotational angle in the X-axis direction was released and allowed to vibrate freely, and its rotational angle and time process were recorded, and the results were analyzed. Tables 1, 2, 3, and 4 respectively show the results after the simulation tests of the hollow carbon fiber tubes in the experimental examples and comparative examples with different architectures.

[0038] Experimental example

[0039] The hollow carbon fiber tube was formed by winding a composite material body including 7 carbon fiber prepreg layers and different numbers of graphene-containing resin layers (torsional vibration damping layers).

[0040] Graphene-containing resin layers with a thickness of 0.075 mm in different numbers were laminated between 7 carbon fiber prepreg cloth layers with a thickness of 0.125 mm to form a composite material body. The graphene used was surface-modified and grafted to have amino groups (-NH2), and based on the total weight of the composite material body, the content of the graphene used was 2 wt%. Then, the composite material body was wound around a mandrel that had been sleeved with an appropriate plastic air bag, and placed in an aluminum metal mold and fixed. Then, the mandrel was withdrawn, and a pressure of 20 psi to 25 psi was applied to the aluminum metal mold. At this time, a gas with a pressure of 25 psi to 30 psi was filled in the plastic air bag to prevent the internal structure from collapsing. Then, the aluminum metal mold was heated at a temperature of 160°C. After heating for 40 minutes, it was allowed to return to room temperature naturally to harden and form. The formed composite material body was taken out of the aluminum metal mold, and the plastic air bag was withdrawn. After that, surface modification and cutting were carried out to make a hollow carbon fiber tube.

[0041] Comparative example A

[0042] Except that the hollow carbon fiber tube only includes 7 carbon fiber prepreg layers, the hollow carbon fiber tube was manufactured in the same manner as in the experimental example.

[0043] Comparative example B

[0044] Except that the hollow carbon fiber tube includes 7 carbon fiber prepreg layers and different numbers of carbon nanotube-containing resin layers (torsional vibration damping layers), the hollow carbon fiber tube was manufactured in the same manner as in the experimental example.

[0045] Table 1

[0046]

[0047]

[0048] As can be seen from Table 1, compared with Comparative Example A without a torsional vibration damping layer, the hollow carbon fiber tubes of Experimental Examples 1, 2, and 3 with a graphene-containing resin layer (torsional vibration damping layer) have a higher damping ratio, and thus have a significant improvement in torsional vibration damping ability. In addition, compared with Comparative Example B1 with a carbon nanotube-containing resin layer as the torsional vibration damping layer, the hollow carbon fiber tube of Experimental Example 1 with the same architecture (same position parameters) also has a higher damping ratio and torsional vibration damping ability, and Experimental Examples 2 and 3 also have a higher damping ratio and torsional vibration damping ability compared with Comparative Example B1. In addition, from Experimental Examples 1, 2, and 3, it can be seen that when the hollow carbon fiber tube has an outer graphene design, the damping ratio and torsional vibration damping ability can be further improved.

[0049] Table 2

[0050]

[0051] As can be seen from Table 2, compared with Comparative Example A without a torsional vibration damping layer, the hollow carbon fiber tubes of Experimental Examples 4 and 5 with a graphene-containing resin layer (torsional vibration damping layer) have a higher damping ratio, and thus have a significant improvement in torsional vibration damping ability. In addition, compared with Comparative Example B2 with a carbon nanotube-containing resin layer as the torsional vibration damping layer, the hollow carbon fiber tube of Experimental Example 4 with the same architecture (same position parameters) also has a higher damping ratio and torsional vibration damping ability, and Experimental Example 5 also has a higher damping ratio and torsional vibration damping ability compared with Comparative Example B2. In addition, from Experimental Examples 4 and 5, it can be seen that when the hollow carbon fiber tube has an outer graphene design, the damping ratio and torsional vibration damping ability can be further improved.

[0052] Table 3

[0053]

[0054] As can be seen from Table 3, compared with Comparative Example A without a torsional vibration damping layer, the hollow carbon fiber tubes of Experimental Examples 6 and 7 with a graphene-containing resin layer (torsional vibration damping layer) have a higher damping ratio, and thus have a significant improvement in torsional vibration damping ability. In addition, compared with Comparative Example B3 with a carbon nanotube-containing resin layer as the torsional vibration damping layer, the hollow carbon fiber tubes of Experimental Examples 6 and 7 also have a higher damping ratio and torsional vibration damping ability. In addition, from Experimental Examples 6 and 7, it can be seen that when the hollow carbon fiber tube has an outer graphene design, the damping ratio and torsional vibration damping ability can be further improved.

[0055] Table 4

[0056]

[0057] As can be seen from Table 4, compared with Comparative Example A without a torsional vibration damping layer, the hollow carbon fiber tubes of Experimental Example 8 and Experimental Example 9 with a graphene-containing resin layer (torsional vibration damping layer) have a higher damping ratio, and thus there is a significant improvement in torsional vibration damping ability. In addition, compared with Comparative Example B4 with a carbon nanotube-containing resin layer as the torsional vibration damping layer, the hollow carbon fiber tube of Experimental Example 8 with the same architecture (same position parameters) also has a higher damping ratio and torsional vibration damping ability, and Experimental Example 9 also has a higher damping ratio and torsional vibration damping ability compared with Comparative Example B4. Additionally, from Experimental Example 8 and Experimental Example 9, it can be seen that when the hollow carbon fiber tube has an outer graphene design, the damping ratio and torsional vibration damping ability can be further improved.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hollow carbon fiber tube formed by winding a composite material body, characterized in that, The composite material body includes: a plurality of carbon fiber prepreg layers; and at least one graphene-containing resin layer, wherein each of the at least one graphene-containing resin layer is disposed between two adjacent carbon fiber prepreg layers, and the total thickness of the at least one graphene-containing resin layer is 1 / 15 to 1 / 3 of the thickness of the composite material body.

2. The hollow carbon fiber tube according to claim 1, characterized in that, The at least one graphene-containing resin layer includes a first graphene-containing resin layer, and the first graphene-containing resin layer is adjacent to the outer surface of the hollow carbon fiber tube.

3. The hollow carbon fiber tube according to claim 2, characterized in that, The at least one graphene-containing resin layer further includes a second graphene-containing resin layer, and the second graphene-containing resin layer is disposed between two adjacent carbon fiber prepreg layers and away from the outer surface of the hollow carbon fiber tube.

4. The hollow carbon fiber tube according to claim 1, characterized in that, Each of the plurality of carbon fiber prepreg layers includes a resin material and a carbon fiber layer impregnated in the resin material.

5. The hollow carbon fiber tube according to claim 1, characterized in that, The graphene-containing resin layer includes a resin material and graphene contained in the resin material.

6. The hollow carbon fiber tube according to claim 4 or 5, characterized in that, The resin material is a thermoplastic material or a thermosetting material.

7. The hollow carbon fiber tube according to claim 5, characterized in that, The specific surface area of the graphene is 30 m 2 / g to 500 m 2 / g.

8. The hollow carbon fiber tube according to claim 5, characterized in that, The content of the graphene is 0.5 wt% to 5 wt%.

9. The hollow carbon fiber tube according to claim 5, characterized in that, The surface of the graphene has reactive functional groups, and the reactive functional groups include amino groups, carboxyl groups, hydroxyl groups, acyl chloride groups or combinations thereof.

10. The hollow carbon fiber tube according to claim 1, characterized in that, The thickness of each of the plurality of carbon fiber prepreg layers is 50 μm to 200 μm.

11. The hollow carbon fiber tube according to claim 1, characterized in that, The thickness of each of the at least one graphene-containing resin layer is 5 μm to 200 μm.

12. The hollow carbon fiber tube according to claim 1, characterized in that, Based on the calculation of formula (1), the graphene position parameter L of the hollow carbon fiber tube is greater than 0, n is the number of graphene-containing resin layers in the composite material body, and d(i) is the distance from the i-th graphene-containing resin layer to the center point of the composite material body in the thickness direction.

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