Shoe-purpose composite laminate having paired carbon fiber layers and preparation method for shoe-purpose composite laminate

Abstract

The present invention provides a shoe-purpose composite laminate, comprising a plurality of carbon fiber layers and a plurality of polyimide fiber layers. Adjacent fiber layers are bonded together by means of a resin adhesive; the plurality of carbon fiber layers comprise a plurality of paired adjacent carbon fiber layers; in each pair of paired carbon fiber layers, fibers of one carbon fiber layer are laid at an acute angle α degrees clockwise with respect to the front-rear direction, and fibers of the other carbon fiber layer are laid at an acute angle α degrees counterclockwise with respect to the front-rear direction. The present invention further provides a sole member comprising the laminate; a shoe product comprising the sole member; and a method for preparing the laminate. The direction, sequence, uniformity, etc. of fiber laying are controlled to improve the mechanical properties of a composite laminate, so as to prepare a high-strength, strong-toughness, and light-weight polyimide fiber / carbon fiber hybrid reinforced resin-based composite laminate, thereby improving the overall performance and prolonging the service life of the shoe-purpose laminate.

Description

Composite material laminate for shoes with paired carbon fiber layers and method for manufacturing the same TECHNICAL FIELD

[0001] The present application relates to the technical field of composite shoe soles, and specifically relates to a composite material laminate for shoes and a method for manufacturing the same. BACKGROUND

[0002] The fiber-reinforced resin composite laminate is a commonly used composite material laminate for shoes, which is mainly composed of fiber materials and resin materials. In the industry, according to the use requirements, the performance of the composite material laminate is often changed by controlling the types and stacking structures of the fiber materials. Carbon fiber has the characteristics of high specific strength, tensile resistance, low bending, and low elongation, which can endow the composite material with the characteristics of high elastic modulus and high tensile strength. However, the carbon fiber composite material also has the characteristics of poor impact resistance, poor toughness, high brittleness, and easy breakage. Polyimide fiber has high strength, good tensile resistance, large elongation, and good toughness, which can make up for the rigidity and poor toughness of carbon fiber. However, the strength and modulus of polyimide fiber are lower than those of carbon fiber, and the performance is inconsistent under different stress states, which can easily cause deformation and deterioration, and affect the reliability and service life of the composite material. Therefore, the laminate prepared by simultaneously laying two kinds of fibers can have the advantages of both fibers, but also has the disadvantages of both fibers. Because the characteristics of the two fibers are quite different, the laying sequence, fiber direction, and uniformity of the two fibers will have a great impact on the performance of the laminate. Some carbon fiber / polyimide composite laminates have insufficient toughness, which can easily cause brittle fracture of the laminate when subjected to impact during movement. Some carbon fiber / polyimide composite laminates have insufficient rigidity, which cannot meet the demand of the propulsion performance of shoes, especially sports shoes. Some carbon fiber / polyimide composite laminates have a heavy weight, which cannot meet the demand of lightweight of shoe soles, especially sports shoe soles. TECHNICAL PROBLEM

[0003] The present application aims to provide a carbon fiber / polyimide fiber-reinforced resin composite laminate for shoes with high strength, high toughness, and excellent and stable comprehensive performance, and to provide a shoe sole member and a shoe product comprising the laminate, and a method for manufacturing the laminate with high efficiency. TECHNICAL SOLUTION

[0004] In a first aspect of the present application, a composite laminate for shoes is provided, comprising a plurality of carbon fiber layers and a plurality of polyimide fiber layers, adjacent fiber layers being combined together by a resin adhesive, characterized in that the plurality of carbon fiber layers comprises a plurality of pairs of adjacent carbon fiber layers, in each pair of adjacent carbon fiber layers, the fibers of one carbon fiber layer are laid at a clockwise acute angle a with respect to the front-rear direction, and the fibers of the other carbon fiber layer are laid at a counterclockwise acute angle a with respect to the front-rear direction. In this document, the front-rear direction is defined with the toe area of the shoe sole as the front and the heel area as the back. For the description of the angle, the front-rear direction is taken as the 0-degree reference axis, and the clockwise direction with respect to the reference axis is taken as the positive angle, and the counterclockwise direction is taken as the negative angle. According to this scheme, the polyimide fiber is used to hybridize the carbon fiber to interlamination toughen the resin-based composite laminate, and the symmetric angle design between adjacent carbon fiber layers can effectively improve the toughness of the laminate.

[0005] In some schemes, the value of a is 15-45 degrees. At this fiber laying angle, the toughness of the laminate can be effectively improved, and the stiffness of the composite material can be maintained, so that the composite laminate for shoes can improve the impact resistance while effectively enhancing the propulsion.

[0006] In some schemes, the fibers of the polyimide fiber layer are laid along the front-rear direction, which can make the laminate have higher toughness.

[0007] In some schemes, the plurality of polyimide fiber layers in the laminate are not adjacent to each other, and each polyimide fiber layer is separated from another polyimide fiber layer by a carbon fiber layer. According to this scheme, when the polyimide fiber layers are blocked by the carbon fiber layers, compared with the polyimide fiber layer aggregation, the initial fracture displacement and stiffness of the composite material are larger, the surface material toughness is higher, the bending and tensile strength is larger and more resistant to deformation.

[0008] In some schemes, the fiber layer on the compression side is a polyimide fiber layer. According to this scheme, the energy absorption effect of the laminate is better than that of the laminate with carbon fiber layers on the compression side, and the displacement and failure strain when the material fails can be increased, the disadvantage of the brittleness of carbon fiber is compensated, and the elongation and toughness of the composite material are improved.

[0009] In some schemes, the plurality of polyimide fiber layers of the laminate comprises a first polyimide fiber layer and a second polyimide fiber layer, the first polyimide fiber layer is located on the compression side, one or two pairs of adjacent carbon fiber layers are laid between the first polyimide fiber layer and the second polyimide fiber layer, and one pair of adjacent carbon fiber layers is laid on the side of the second polyimide fiber layer away from the first polyimide fiber layer. According to this scheme, the laminate can be lightened, the elongation and toughness of the composite material are increased, and the appropriate stiffness is maintained, the disadvantage of the brittleness of carbon fiber is compensated, the bending and tensile strength of the material is increased and more resistant to deformation.

[0010] In a second aspect, a shoe sole member is provided, comprising the shoe composite laminate of any one of the preceding aspects, according to which scheme, the member can be lightweight, have high toughness and moderate rigidity, and have excellent comprehensive performance, and is more suitable for use as a shoe sole member.

[0011] In a third aspect, a shoe product is provided, comprising the shoe sole member of any one of the preceding aspects, according to which scheme, the shoe product can be lightweight, the shoe sole can have support and rapid response according to the stress characteristics, has better propulsion performance, and has higher user experience.

[0012] In a fourth aspect, a preparation method is provided for preparing the shoe composite laminate of the preceding aspects, comprising the following steps: step one: layering, the position and angle of the carbon fiber and polyimide fiber prepreg are designed and layered to obtain a composite material; step two: cutting, the composite material obtained in step one is cut according to the shape of the mold; step three: molding, the cut composite material is placed in a molding mold, and after pressure and heating, holding and cooling according to the molding conditions, curing molding is completed to obtain a composite laminate. In some schemes, the preparation method further comprises step four: post-processing, the molded composite laminate is polished, washed, sandblasted and painted. Preferably, the curing temperature is 110-220°C, the pressure is 1-3MPa, and the molding time is 5-30min. Advantages

[0013] According to the scheme, high-strength and high-modulus polyimide fibers are used to hybridize carbon fibers to interlamination toughen the resin-based composite laminate, to solve the problems of brittle fracture, aging and damage of carbon fiber reinforced resin-based composite laminates for sports shoes. The fiber layers are designed with respect to the angle in the front and rear directions, the layering sequence of different fiber layers is controlled, and the uniformity of fiber laying is controlled to realize the lightweight of the laminate, so that the laminate has appropriate toughness and rigidity, and the comprehensive performance of the laminate is improved. A polyimide fiber / carbon fiber hybrid reinforced resin-based composite laminate with high strength, high toughness and light weight is prepared, thereby improving the service life of the shoe laminate as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 shows a plan view of a shoe sole.

[0015] Figure 2 shows a schematic view of the fiber layering of the laminates in Examples 1-3.

[0016] Figure 3 shows a schematic view of the fiber arrangement angle in Example 1. Embodiments of the present application

[0017] In order to make the purpose, scheme and advantages of the technical solutions of the present application more clear, the technical solutions of the present application will be described clearly and completely in the following with reference to specific embodiments of the present application. Unless otherwise specified, the terms used herein have the meanings commonly understood in the art.

[0018] The present application uses high-strength and high-modulus polyimide fibers to hybridize carbon fibers to interlamination toughen resin-based composite laminates, to solve the problems of easy brittle fracture, easy aging and easy damage of carbon fiber reinforced resin-based composite laminates for shoes, and in the manner of the present application, the lightweight of the laminates is realized by angle design of the fibers of the fiber layers relative to the front-rear direction, control of the laying sequence of different fiber layers, and control of the uniformity of fiber laying, the laminates have suitable toughness and rigidity, the comprehensive performance of the laminates is improved, a high-strength, high-toughness and lightweight polyimide fiber / carbon fiber hybrid reinforced resin-based composite laminate is prepared, and the overall use experience of the shoe laminates is improved, and the service life is prolonged.

[0019] Several embodiments and several comparative examples of the present application are described below to illustrate the specific means and technical effects of the present application. The terms used in the following description are understood according to the meanings commonly understood in the art, unless otherwise specified, for example, "compression side" refers to the side facing the ground when the laminate is assembled into a shoe product; "tension side" refers to the side facing the upper when the laminate is assembled into a shoe product.

[0020]

Effect of angle

[0021] Example 1

[0022] The present embodiment provides a composite laminate for shoes, which is arranged in order from 8 layers of fiber layers from the compression side to the tension side (as shown in Table 1), wherein the fiber layer arranged on the compression side is the first layer, and the fiber layer arranged on the tension side is the eighth layer, the different fiber layers are combined together by a resin adhesive, wherein the first layer is a polyimide fiber layer, the second layer is a carbon fiber layer, the third layer is a carbon fiber layer, the fourth layer is a carbon fiber layer, the fifth layer is a carbon fiber layer, the sixth layer is a polyimide fiber layer, the seventh layer is a carbon fiber layer, and the eighth layer is a carbon fiber layer (fiber layer laying sequence is shown in FIG. 2), the toe area of the laminate body is taken as the front, the heel area of the laminate body is taken as the back, the front-back direction is taken as the reference axis, the clockwise direction relative to the reference axis is the positive angle, and the counterclockwise direction is the negative angle, the fibers laid in the first layer are arranged at 0° to the reference axis, the fibers of the second layer are at 15° to the reference axis, the fibers of the third layer are at -15° to the reference axis, the fibers of the fourth layer are at 15° to the reference axis, the fibers of the fifth layer are at -15° to the reference axis, the fibers of the sixth layer are at 0° to the reference axis, the fibers of the seventh layer are at 15° to the reference axis, and the fibers of the eighth layer are at -15° to the reference axis (two fiber arrangement angles are shown in FIG. 3).

[0023] Layer number angle (°) Material 10 Polyimide fiber 215 Carbon fiber 3-15 Carbon fiber 415 Carbon fiber 5-15 Carbon fiber 60 Polyimide fiber 715 Carbon fiber 8-15 Carbon fiber

[0024] Table 1: Laying manner of Example 1

[0025] The present embodiment also provides a preparation method for preparing the above-mentioned composite material laminate for shoes, which comprises the following steps: Step 1: Laying, carbon fibers and polyimide fiber prepreg are laid according to the position order and angle design described in the above-mentioned embodiment to obtain a composite material; Step 2: Cutting, the composite material obtained in Step 1 is cut according to the shape of a mold; Step 3: Forming, the cut composite material is placed into a forming mold, and after pressure and heating, holding and cooling are applied according to the forming conditions, curing forming is completed to obtain a composite material laminate, the curing temperature is 110-220℃, the pressure is 1-3MPa, and the forming time is 5-30min; Step 4: Post-processing, the formed composite material laminate is polished, washed, sandblasted and painted to obtain a composite material laminate for shoes.

[0026] It should be noted that the "prepreg" described herein and in the following embodiments refers to an intermediate state material formed by previously immersing the carbon fibers or polyimide fibers to be laid in a thermosetting resin adhesive, the fiber brand of the "carbon fiber prepreg" is T300, T400, T700, T800, T1000 or T1100, etc., the fiber brand of the "polyimide fiber prepreg" is S20, S25, S30, S35, S40, and various feasible thermosetting resin adhesive materials can be used in the present application, including epoxy resin, polyurethane, acrylate, etc., and the present application does not limit the specific type of the thermosetting resin adhesive used.

[0027] Example 2

[0028] The present application provides a kind of composite material laminated sheet for shoe, from compression side to tensile side in turn is divided into 8 layers of fiber layer (as shown in table 2), wherein the fiber layer arranged in compression side is first layer, the fiber layer arranged in tensile side is eighth layer, different fiber layers are bonded together by resin adhesive, wherein the first layer is polyimide fiber layer, the second layer is carbon fiber layer, the third layer is carbon fiber layer, the fourth layer is carbon fiber layer, the fifth layer is carbon fiber layer, the sixth layer is polyimide fiber layer, the seventh layer is carbon fiber layer, the eighth layer is carbon fiber layer (fiber layer laying order is seen in figure 2), with the toe area of the laminated sheet body as front, with the heel area of the laminated sheet body as back, with front-back direction as reference axis, the clockwise direction of reference axis is positive angle, and the counterclockwise direction is negative angle, the fiber of first layer is arranged to be 0 with reference axis, the fiber of second layer is 25 with reference axis, the fiber of third layer is-25 with reference axis, the fiber of fourth layer is 25 with reference axis, the fiber of fifth layer is-25 with reference axis, the fiber of sixth layer is 0 with reference axis, the fiber of seventh layer is 25 with reference axis, and the fiber of eighth layer is-25 with reference axis.

[0029] Layer Angle (°) Material 10 Polyimide fiber 2 5 Carbon fiber 3-25 Carbon fiber 4 25 Carbon fiber 5-25 Carbon fiber 6 0 Polyimide fiber 7 25 Carbon fiber 8-25 Carbon fiber

[0030] Table 2: laying mode of example 2

[0031] The present application also provides a preparation method for preparing the above-mentioned composite material laminated sheet for shoe, which comprises the following steps: step one: laying, carbon fibers and polyimide fiber prepreg are laid according to the position order and angle design described in the above examples to obtain a composite material; step two: cutting, the composite material obtained in step one is cut according to the shape of the mold; step three: molding, the cut composite material is placed in a molding mold, and after pressure and heating, holding and cooling are applied according to the molding conditions, curing molding is completed to obtain a composite material laminated sheet, the curing temperature is 110-220℃, the pressure is 1-3MPa, and the molding time is 5-30min; step four: post-treatment, the molded composite material laminated sheet is polished, washed, sandblasted and painted to obtain a composite material laminated sheet for shoe.

[0032] Example 3

[0033] The present application provides a kind of composite material laminated sheet for shoe, from compression side to tensile side in turn is divided into 8 layers of fiber layer (as shown in table 3), wherein the fiber layer arranged in compression side is first layer, the fiber layer arranged in tensile side is eighth layer, different fiber layers are compounded together by resin adhesive, wherein the first layer is polyimide fiber layer, the second layer is carbon fiber layer, the third layer is carbon fiber layer, the fourth layer is carbon fiber layer, the fifth layer is carbon fiber layer, the sixth layer is polyimide fiber layer, the seventh layer is carbon fiber layer, the eighth layer is carbon fiber layer (fiber layer laying order is seen in figure 2), with the toe area of the laminated sheet body as front, with the heel area of the laminated sheet body as back, with front-back direction as reference axis, relative to the clockwise direction of reference axis is positive angle, and the counterclockwise direction is negative angle, the fiber of first layer is arranged to be 0 with reference axis, the fiber of second layer is 45 with reference axis, the fiber of third layer is-45 with reference axis, the fiber of fourth layer is 45 with reference axis, the fiber of fifth layer is-45 with reference axis, the fiber of sixth layer is 0 with reference axis, the fiber of seventh layer is 45 with reference axis, and the fiber of eighth layer is-45 with reference axis.

[0034] Layer number Angle (°) Material 10 Polyimide fiber 2 45 Carbon fiber 3-45 Carbon fiber 4 45 Carbon fiber 5-45 Carbon fiber 6 0 Polyimide fiber 7 45 Carbon fiber 8-45 Carbon fiber

[0035] Table 3: laying mode of example 3

[0036] The present embodiment also provides a preparation method for preparing the above-mentioned composite material laminated sheet for shoe, which comprises the following steps: step one: laying, carbon fibers and polyimide fiber prepreg are laid according to the position order and angle design described in the above-mentioned embodiment to obtain a composite material; step two: cutting, the composite material obtained in step one is cut according to the shape of the mold; step three: molding, the cut composite material is placed in a molding mold, and after pressure and heating, holding and cooling are applied according to the molding conditions, curing molding is completed to obtain a composite material laminated sheet, the curing temperature is 110-220 DEG C, the pressure is 1-3 MPa, and the molding time is 5-30 min; step four: post-treatment, the molded composite material laminated sheet is polished, washed, sandblasted and painted to obtain a composite material laminated sheet for shoe.

[0037] The shoe composite laminates of Example 1, Example 2, and Example 3 described above, and the same code number of Comparative Example 1 were respectively subjected to performance testing and data comparison. In Comparative Example 1 (as shown in Table 4), the fibers of all layers were not designed with symmetric angles, and the fibers of all fiber layers were parallel to the front and rear directions, while the other manufacturing steps were exactly the same as those of Examples 1-3. The properties tested for Examples 1-3 and Comparative Example were initial fracture displacement and stiffness, and the performance testing methods used were Chinese national standards. The initial fracture displacement refers to the displacement of the fiber-reinforced resin-based composite material when the first macroscopic crack or fracture occurs in the three-point bending test of the material sample. This displacement corresponds to the time when the material begins to lose integrity or produce obvious cracks, and can reflect the toughness of the material. Generally, the higher the value, the better the material toughness. The representative value is the point where the nonlinearity or obvious decline appears on the force-displacement curve. The testing method can refer to “GB / T1449-2005 Fiber Reinforced Plastics Bending Performance Test Method”. The stiffness refers to the ability of a material or component to resist deformation under load. In this technical solution, the stiffness specifically refers to the ability of the flexing part of the sole material to resist elastic deformation under stress. Components with high stiffness are less likely to deform under stress, while components with low stiffness are more likely to deform. The testing method for stiffness can refer to “GB / T32023-2023 Shoe Test Method for Flexing Part Stiffness”.

[0038] Layer Angle (°) Material 10 Polyimide Fiber 20 Carbon Fiber 30 Carbon Fiber 40 Carbon Fiber 50 Carbon Fiber 60 Polyimide Fiber 70 Carbon Fiber 80 Carbon Fiber

[0039] Table 4: Layering method of Comparative Example 1

[0040] Examples 1-3 and Comparative Example 1 were respectively subjected to performance testing, and the results are shown in the following table:

[0041] Sample Name Code Number Mass (g) Initial Fracture Displacement (mm) Stiffness (Nm / deg) Example 1 US 7.5 20.3 38.9 0.653 Example 2 US 7.5 20.1 48.3 0.637 Example 3 US 7.5 20.6 28.2 0.617 Comparative Example 1 US 7.5 20.4 58.1 0.649

[0042] According to the performance test data of the above-mentioned embodiments 1-3 and comparative example 1, it can be seen that, in the present application, the symmetric angle design is performed between different fiber layers, in embodiment 1, the symmetric angle is set to 15 degrees / -15 degrees, compared with comparative example 1 which does not perform angle design, the mass of the composite laminated plate is reduced, the shoe is more lightweight, the initial fracture displacement is increased, the toughness of the composite material is enhanced, and the stiffness of the composite material is also enhanced, which effectively enhances the propulsion while improving the impact resistance of the shoe; in embodiment 2, the symmetric angle is set to 25 degrees / -25 degrees, compared with comparative example 1 which does not perform angle design, the mass of the shoe composite laminated plate is reduced, the shoe is more lightweight, the initial fracture displacement is increased, the toughness of the composite material is stronger, and at the same time, the stiffness of the composite material is not significantly reduced, which can maintain strong propulsion while improving the impact resistance, so that the shoe is not easy to deform; in embodiment 3, the symmetric angle is set to 45 degrees / -45 degrees, compared with comparative example 1 which does not perform angle design, the initial fracture displacement is increased, the toughness of the composite material is enhanced, and the stiffness of the composite material is not significantly reduced, which can maintain strong propulsion while improving the impact resistance of the shoe, so that the shoe is not easy to deform.

[0043]

Sequential effects

[0044] Embodiment 4

[0045] The present application provides a shoe composite laminated plate, which is sequentially divided into 6 fiber layers from the compression side to the stretching side (as shown in Table 5), wherein the fiber layer arranged at the compression side is the first layer, and the fiber layer arranged at the stretching side is the sixth layer, different fiber layers are combined together by a resin adhesive, wherein the first layer is a polyimide fiber layer, the second layer is a carbon fiber layer, the third layer is a carbon fiber layer, the fourth layer is a polyimide fiber layer, the fifth layer is a carbon fiber layer, and the sixth layer is a carbon fiber layer, the toe area of the laminated plate body is taken as the front, the heel area of the laminated plate body is taken as the back, the front-back direction is taken as the reference axis, the clockwise direction relative to the reference axis is the positive angle, and the counterclockwise direction is the negative angle, the fiber of the first layer is arranged to be 0° to the reference axis, the fiber of the second layer is 15° to the reference axis, the fiber of the third layer is-15° to the reference axis, the fiber of the fourth layer is 0° to the reference axis, the fiber of the fifth layer is 15° to the reference axis, and the fiber of the sixth layer is-15° to the reference axis.

[0046] Number of layers Angle (°) Material 10 Polyimide fiber 2 15 Carbon fiber 3-15 Carbon fiber 4 0 Polyimide fiber 5 15 Carbon fiber 6-15 Carbon fiber

[0047] Table 5: Plying method of embodiment 4

[0048] The embodiment also provides a preparation method for preparing the composite laminated plate for shoes, which comprises the following steps: step 1: layering, carbon fibers and polyimide fiber prepregs are layered according to the position sequence and angle design described in the above embodiment to obtain a composite material; step 2: cutting, the composite material obtained in step 1 is cut according to the shape of a mold; step 3: molding, the cut composite material is placed into a molding mold, and after pressure and heating, holding and cooling are applied according to molding conditions, curing molding is completed to obtain a composite laminated plate, the curing temperature is 110-220 DEG C, the pressure is 1-3 MPa, and the molding time is 5-30 min; and step 4: post-processing, the molded composite laminated plate is polished, washed, sandblasted and painted to obtain a composite laminated plate for shoes.

[0049] The composite laminated plate for shoes in the above embodiment 4 and the same size of comparative examples 2-3 are respectively subjected to performance testing and data comparison, and the only difference between comparative example 2 (as shown in Table 6) and embodiment 4 is that the laying sequence of the six fiber layers in comparative example 2 is exactly opposite to that in embodiment 4, the compression side of embodiment 4 is the polyimide fiber layer, while the compression side of comparative example 2 is the carbon fiber layer, and except for this, the fiber angle design and the manufacturing steps are completely the same. The only difference between comparative example 3 (as shown in Table 7) and embodiment 4 is that the uniformity of the fiber layer distribution is different, and except for this, the compression side is the polyimide fiber layer, and the fiber angle design and the manufacturing steps are completely the same. The performance tested in embodiment 4, comparative examples 2-3 is respectively the initial fracture displacement and the stiffness of the material, and the performance testing method used is the national standard, wherein the initial fracture displacement refers to the displacement of the fiber reinforced resin composite material when the first macroscopic crack or fracture occurs in the three-point bending test, which corresponds to the time when the material begins to lose integrity or produce obvious cracks, and can reflect the toughness of the material, and generally, the higher the value, the better the toughness of the material, and generally, the point at which the nonlinearity or obvious decline appears on the force-displacement curve is taken as the representative value, and the testing method can refer to “GB / T1449-2005 Fiber Reinforced Plastics Bending Performance Test Method”; and the stiffness refers to the ability of a material or component to resist deformation under load, and in the technical solution, the stiffness specifically refers to the ability of the flexing part of the sole material to resist elastic deformation under stress, and the component with high stiffness is not easy to deform under stress, while the component with low stiffness is easy to deform, and the testing method of the stiffness can refer to “GB / T32023-2023 Shoe Test Method for Flexing Part Stiffness”.

[0050] Layer Angle (°) Material 1 5 Carbon fiber 2-15 Carbon fiber 30 Polyimide fiber 4 5-15 Carbon fiber 6 0 Polyimide fiber

[0051] Table 6: Layering mode of comparative example 2

[0052] Number of layers Angle (°) Material 10 Polyimide fiber 215 Polyimide fiber 3-15 Carbon fiber 40 Carbon fiber 515 Carbon fiber 6-15 Carbon fiber

[0053] Table 7: Laying information of Comparative Example 3

[0054] The performance tests of Example 4, Comparative Example 2 and Comparative Example 3 are carried out respectively, and the results are shown in the following table:

[0055] Sample name Code number Mass (g) Initial breaking displacement (mm) Stiffness (Nm / deg) Example 3 US 7.5 14.5 41 3.25 0.384 Comparative Example 2 US 7.5 14.6 11 1.89 0.368 Comparative Example 3 US 7.5 14.3 12.1 20.324

[0056] According to the comparison of the performance test data of Example 4 and Comparative Example 2, the initial breaking displacement and stiffness in the example are higher than those in the comparison. The present application fixes the fiber layer on the compression side as a polyimide fiber layer, which can increase the initial breaking displacement value of the laminate compared with the displacement value of the laminate with carbon fiber layer on the compression side, and the stiffness is also increased, indicating that the material toughness is improved, the energy absorption effect of the shoe sole is better than that of the laminate with carbon fiber on the compression side, the displacement and damage strain when the material fails can be increased, the disadvantage of the brittleness of carbon fiber is compensated, and the elongation, toughness and impact resistance of the composite material are improved.

[0057] According to the comparison of the performance test data of Example 4 and Comparative Example 3, the present application uniformly lays the polyimide fiber layer and the carbon fiber layer in the example, which can increase the initial breaking displacement value of the composite material compared with the non-uniform laying of the two fiber layers, and the stiffness value is also increased, indicating that the bending and tensile strength of the laminate is increased, the toughness is improved, the ability to resist deformation and damage is enhanced, and the comprehensive performance of the material is improved.

[0058] In a further embodiment, a shoe sole member is provided, as shown in Figure 1, which comprises the shoe composite laminate in any of the preceding embodiments, and the shoe sole member can be lightweight, has high toughness and moderate rigidity, has excellent comprehensive performance, and is more suitable for use as a shoe sole member.

[0059] In a further embodiment, a shoe product is provided, comprising the shoe sole member shown in Figure 1, and the shoe product can be lightweight, the shoe sole can take into account support and rapid response according to the stress characteristics, has better propulsion performance, and has higher user experience.

[0060] The exemplary embodiments of the present application are described herein with reference to the preferred embodiments. However, various modifications and changes can be suggested by those skilled in the art, and it is intended that the present application encompass such modifications and changes as fall within the scope of the appended claims.

Claims

1. A composite laminate for footwear, comprising multiple carbon fiber layers and multiple polyimide fiber layers, wherein adjacent fiber layers are bonded together by a resin adhesive, characterized in that, The plurality of carbon fiber layers include a plurality of paired adjacent carbon fiber layers, wherein the fibers of one carbon fiber layer are laid at an acute angle α degrees clockwise relative to the front-back direction, and the fibers of the other carbon fiber layer are laid at an acute angle α degrees counterclockwise relative to the front-back direction.

2. The composite material laminate for footwear according to claim 1, characterized in that, The value of α is 15-45 degrees.

3. The composite material laminate for footwear according to claim 1, characterized in that, The polyimide fiber layer is laid out along the front-to-back direction.

4. The composite material laminate for footwear according to any one of claims 1-3, characterized in that, The plurality of polyimide fiber layers are not adjacent to each other, and each polyimide fiber layer is separated from another polyimide fiber layer by a carbon fiber layer.

5. The composite material laminate for footwear according to claim 4, characterized in that, The fiber layer on the compression side is a polyimide fiber layer.

6. The composite material laminate for footwear according to claim 4, characterized in that, The plurality of polyimide fiber layers include a first polyimide fiber layer and a second polyimide fiber layer. The first polyimide fiber layer is located on the compression side. One or two pairs of adjacent carbon fiber layers are laid between the first polyimide fiber layer and the second polyimide fiber layer. On the side of the second polyimide fiber layer away from the first polyimide fiber layer, a pair of adjacent carbon fiber layers are laid.

7. A shoe sole component comprising the composite material laminate for footwear as described in claims 1-6.

8. A shoe product comprising the sole component as described in claim 7.

9. A preparation method for preparing the shoe composite laminate according to any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Lamination, lay up carbon fiber and polyimide fiber prepreg to obtain composite material; Step 2: Cutting. Cut the composite material obtained in Step 1 according to the shape of the mold. Step 3: Molding. The cut composite material is placed into the molding mold. Pressure is applied according to the molding conditions, and the material is heated, kept warm, and cooled to complete the curing and molding process, resulting in a composite laminate.

10. The preparation method according to claim 9, characterized in that, Also includes Step 4: Post-processing, the formed composite laminate is sanded, cleaned, sandblasted and painted.

11. The preparation method according to claim 9, characterized in that, The curing temperature is 110-220℃, the pressure is 1-3MPa, and the molding time is 5-30min.

Images