Flow guide cloth, composite material and preparation method

Abstract

The application provides a flow guide cloth, a composite material and a preparation method, and belongs to the technical field of composite materials. The flow guide cloth comprises: a flexible base material; and a magnetic fiber array which penetrates through the flexible base material in an upright state; wherein the flow guide cloth is arranged in the middle of a double-layer material, a pinning effect is formed between the magnetic fiber array and a first resin glue which is solidified and formed in the double-layer material, so that the mechanical properties of a composite material formed by the double-layer material, the flow guide cloth and the first resin glue are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of composite materials, and particularly relates to a flow guide cloth, a composite material and a preparation method. BACKGROUND

[0002] A composite material is composed of two or more different materials that are complementary in performance to achieve performance that a single material cannot achieve. The advantages of composite materials include light weight, high strength, corrosion resistance, fatigue resistance, designability, etc., and are widely used in many modern industrial technology fields such as aerospace, military, transportation and construction. In the process of using composite materials in the above-mentioned industrial technology fields, different composite parts need to be placed with flow guide cloth for vacuum infusion when connected to each other, such as secondary curing and bonding, to facilitate resin flow. After the composite parts are cured and formed, the surface is covered with a resin layer, so it is relatively smooth and flat. After secondary bonding of the composite parts, the volume fraction of the fibers in the flow guide cloth is small, resulting in a phenomenon of rich resin in the bonding area of the flow guide cloth after secondary bonding, which in turn easily leads to the bonding strength of the resin bonding layer being weaker than the strength of the composite part body, resulting in debonding failure of the resin bonding layer.

[0003] The current common treatment method is to perform secondary treatment on the surface of the cured and formed composite parts by means of sandblasting, polishing, plasma treatment, laser etching, etc., to improve the bonding strength of the bonding surface. However, sandblasting and polishing in the above-mentioned treatment methods often cause different degrees of damage to the composite part body; plasma treatment or laser etching treatment requires high equipment, and is not easy to be industrialized and applied on a large scale. Therefore, although the above-mentioned technical means can improve the mechanical properties of the composite material to a certain extent, there are additional processing costs, equipment costs, etc., which are difficult to popularize and apply in many different scenarios. SUMMARY

[0004] In view of the above technical problems, the present application provides a flow guide cloth, a composite material and a preparation method, in order to at least partially solve the above technical problems, and thus the specific technical solutions provided by the present application are as follows.

[0005] As a first aspect of the present application, a flow guide cloth is provided, comprising: a flexible substrate; and an array of magnetic fibers in an upright state penetrating through the flexible substrate; wherein the flow guide cloth is arranged in the middle of a double-layer material, and a pinning effect is formed between the array of magnetic fibers and a first resin glue cured and formed in the double-layer material, thereby improving the mechanical properties of a composite material formed by the double-layer material, the flow guide cloth and the first resin glue.

[0006] As a second aspect of the present application, a preparation method of the flow guide cloth is provided, comprising: impregnating a flexible substrate with a resin solution to obtain a pre-impregnated flexible substrate; placing the pre-impregnated flexible substrate in a magnetic field, and uniformly dropping magnetic fibers from above the pre-impregnated flexible substrate, so that the magnetic fibers fall onto the surface of the pre-impregnated flexible substrate in an upright state under the action of the magnetic field and gravity, forming a magnetic fiber array; and applying pressure to the magnetic fiber array to penetrate the magnetic fiber array through the pre-impregnated flexible substrate, and heating and curing to obtain the flow guide cloth.

[0007] As a third aspect of the present application, a composite material is provided, comprising: at least two base materials; and the flow guide cloth described above, which is located between the two adjacent base materials and is glued to the base materials by a first resin glue; wherein the magnetic fiber array in the flow guide cloth forms a pinning effect with the first resin glue, thereby improving the mechanical properties of the composite material.

[0008] As a fourth aspect of the present application, a preparation method of a composite material is provided, comprising: providing at least two base materials, placing a flow guide cloth between the two adjacent base materials, guiding the first resin glue between the two adjacent base materials through the flow guide cloth, and forming a composite material through a forming process.

[0009] Based on the above technical solutions, the flow guide cloth, the composite material and the preparation method provided by the present application at least have one of the following beneficial effects.

[0010] (1) In the embodiments of the present application, the flow guide cloth is composed of a flexible substrate and a magnetic fiber array penetrating the flexible substrate. When used, the flow guide cloth is arranged between double-layer materials to guide the first resin glue. At the same time, the magnetic fibers in the flow guide cloth penetrate and protrude from the flexible substrate, and contact the cured first resin glue of the upper and lower layers to form a pinning effect, which hinders the initiation and propagation of cracks in the first resin glue, and improves the mechanical properties of the composite material formed by the double-layer materials, the flow guide cloth and the first resin glue. The flow guide cloth provided by the present application can be used in the curing and forming process of various composite materials, and has good universality.

[0011] (2) In the embodiments of the present application, the rigid substrate is first impregnated with the second resin glue, and then the magnetic fibers are distributed on the surface of the flexible substrate in an upright state to form a magnetic fiber array. The magnetic fibers fall onto the surface of the flexible substrate under the action of the magnetic field and gravity, and pressure is applied to the magnetic fiber array to penetrate the magnetic fiber array through the flexible substrate. After curing, the magnetic fibers are stably fixed in the flexible substrate by the second resin glue. The preparation method of the flow guide cloth provided by the present application has good feasibility, low technical difficulty, high preparation efficiency, easy to scale, good process controllability, significant improvement of the interlaminar mechanical properties of the composite material, and good industrial application prospect.

[0012] (4) In the embodiment of the present application, the above-mentioned flow guide cloth is arranged between two adjacent base materials, and then the first resin glue is poured, and the flow guide cloth and the two adjacent base materials are bonded and solidified by the first resin glue to obtain a composite material. The preparation method of the composite material provided by the present application enhances the interfacial bonding force in the composite material through the interaction between the magnetic fibers in the flow guide cloth and the first resin glue, so that the mechanical properties of the whole composite material are significantly improved, the tensile and shear resistance is enhanced, and the demand for more complex working conditions is met. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a continuous flow guide cloth preparation flowchart in embodiment 1 of the present application;

[0014] Figure 2 It is a cross-section schematic diagram of the nickel-plated carbon fiber roller pressing into the carbon fiber surface felt in embodiment 1 of the present application;

[0015] Figure 3 It is a schematic diagram of the flow guide cloth in embodiment 1 of the present application;

[0016] Figure 4 It is a scanning electron microscope (SEM) diagram of the flow guide cloth in embodiment 1 of the present application;

[0017] Figure 5 It is a schematic diagram of the vacuum infusion molding device of the composite material in embodiment 1 of the present application;

[0018] Figure 6 It is a mechanical test schematic diagram of the carbon fiber composite material laminated board in embodiment 1 of the present application;

[0019] Figure 7 It is a peel strength test result diagram of different carbon fiber composite material laminated boards in embodiment 1 of the present application.

[0020] BRIEF DESCRIPTION OF DRAWINGS:

[0021] 1-1 cloth feeding roller, 1-2 carbon fiber surface felt, 1-3 cloth collecting roller;

[0022] 2-1 resin solution sprayer, 2-2 vibrating screen, 2-3 vibrating motor;

[0023] 3-1 nickel-plated carbon fiber, 3-2 nickel-plated carbon fiber in vertical state;

[0024] 4-1 first magnet, 4-2 magnetic field direction, 4-3 second magnet, 4-41 first compression roller, 4-42 second compression roller, 4-43 first metal shaft, 4-44 second metal shaft, 4-45 first support, 4-46 second support, 4-5 third magnet;

[0025] 5-1 heating power supply, 5-2 first wire, 5-3 second wire, 5-4 heating cavity, 5-5 thermocouple;

[0026] 6-1 glue inlet, 6-2 silica gel tube, 6-3 resin tank, 6-4 resin solution;

[0027] 7-1 mold bottom plate, 7-2 sealant, 7-3 separation film, 7-4 vacuum bag;

[0028] 8-1 first plate, 8-2 flow guide cloth, 8-3 second plate;

[0029] 9-1 air outlet, 9-2 air pipe, 9-3 vacuum pump;

[0030] Magnetic fiber V-1, continuous fiber V-2 in flow guide cloth. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with specific examples and with reference to the drawings.

[0032] The present application provides a flow guide cloth including a flexible substrate and a magnetic fiber array, which can be used in the secondary bonding of composite materials, and improves the mechanical properties of the bonding part during the secondary bonding of the composite materials through the magnetic fibers penetrating and extending out of the flexible substrate.

[0033] As a first aspect of the present application, a flow guide cloth is provided, including: a flexible substrate; and a magnetic fiber array penetrating the flexible substrate in an upright state; wherein the flow guide cloth is arranged between double-layer materials, and a pinning effect is formed between the magnetic fiber array and the first resin glue solidified and formed in the double-layer materials, thereby improving the mechanical properties of the composite material formed by the double-layer materials, the flow guide cloth and the first resin glue.

[0034] In the embodiments of the present application, the present application provides a flow guide cloth composed of a flexible substrate and a magnetic fiber array penetrating the flexible substrate, which is arranged between double-layer materials during use, and plays a role of guiding the first resin glue. Meanwhile, the magnetic fibers penetrating and extending out of the flexible substrate in the flow guide cloth are in contact with the first resin glue solidified on the upper and lower layers to form a pinning effect, which hinders the initiation and expansion of cracks in the first resin glue, and improves the mechanical properties of the composite material formed by the double-layer materials, the flow guide cloth and the first resin glue. The flow guide cloth provided by the present application can be used in the solidification and forming process of various composite materials, and has good universality.

[0035] According to the embodiments of the present application, the load of the magnetic fibers on the flexible substrate is 10-200 roots / cm 2 , for example, 10 roots / cm 2 , 50 roots / cm2 100 roots / cm 2 150 roots / cm 2 200 roots / cm 2 The distribution density of the magnetic fibers is determined according to the material type and density of the actually used magnetic fibers. Since different types of magnetic fibers differ greatly, the number of roots per unit area is used as the counting method of the distribution density. At a lower load, the pinning points of the magnetic fibers are relatively sparse, and mainly play a role in inhibiting micro-scale cracks and small deformations; and as the load increases, on the one hand, more magnetic fibers provide more pinning points, strengthening the resistance to crack propagation, and on the other hand, the interaction between the magnetic fibers is enhanced, forming a synergistic pinning effect similar to "fiber clusters".

[0036] According to the embodiment of the present application, the magnetic fibers are bonded on the flexible substrate by the second resin adhesive. The first resin adhesive and the second resin adhesive respectively comprise at least one of a thermosetting resin and a thermoplastic resin. The thermosetting resin comprises at least one of an epoxy resin, a polyurethane, an unsaturated polyester, and a phenolic resin; the thermoplastic resin comprises at least one of polyvinyl alcohol, polyvinyl butyral, polyvinyl acetate, polyester, polyacrylate, rosin modified alkyd resin, polyvinyl chloride, chlorinated polypropylene, and alcohol-soluble polyamide. The flexible substrate comprises any one of a fabric prepared from continuous fibers, or a non-woven fabric prepared from short fibers, and a surface felt. The fibers for preparing the flexible substrate comprise at least one of carbon fibers, glass fibers, basalt fibers, aramid fibers, polypropylene fibers, polyethylene fibers, and polyamide fibers. The magnetic fibers comprise at least one of stainless steel fibers, nickel-plated fibers, and fibers coated with a layer of ferroferric oxide. The nickel-plated fibers comprise at least one of nickel-plated carbon fibers, nickel-plated glass fibers, nickel-plated basalt fibers, nickel-plated aramid fibers, nickel-plated liquid crystal fibers, and nickel-plated polyamide fibers; the fibers coated with a layer of ferroferric oxide comprise at least one of ferroferric oxide-coated carbon fibers, ferroferric oxide-coated glass fibers, ferroferric oxide-coated basalt fibers, ferroferric oxide-coated aramid fibers, ferroferric oxide-coated liquid crystal fibers, and ferroferric oxide-coated polyamide fibers. Since the flow guide cloth will remain in the finally prepared composite material, the same or similar fibers as the composite material can be selected to be plated with nickel or coated with ferroferric oxide to obtain the magnetic fibers, as well as the flexible substrate and the resin adhesive, so as to meet the actual application of the composite material subsequently. The fiber material used for the flow guide cloth is preferably consistent with the fiber material used for the main body of the composite material which is secondarily bonded, or from the perspective of the secondary bonding performance of the composite material not being lower than the performance of the main body, the mechanical performance of the fiber material used for the flow guide cloth is preferably not lower than the fiber material used for the main body of the composite material.

[0037] According to the embodiment of the present application, the thickness of the flexible substrate is 0.05-0.5mm, for example, it can be 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm. The magnetic fiber penetrates the flexible substrate by external force, therefore, the diameter of the magnetic fiber is controlled to be 5-300μm, for example, it can be 5μm, 50μm, 100μm, 150μm, 200μm, 250μm, 300μm, to avoid causing great damage to the flexible substrate, and the prepared drainage cloth is not flat enough. The length of the magnetic fiber is 0.15-0.8mm, for example, it can be 0.15mm, 0.2mm, 0.3mm, 0.5mm, 0.8mm. The length of the magnetic fiber exposed outside the flexible substrate is 0.1-0.3mm, for example, it can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm. In the preparation of multi-layer composite material, the exposed magnetic fiber can be like a "nail" to "nail" the adjacent material layers together. Therefore, the appropriate exposed length is selected, that is, the length of the magnetic fiber is controlled to be about 1.5 times to 2 times of the thickness of the flexible substrate, and the length of the magnetic fiber penetrating and extending out of both sides of the flexible substrate remains consistent, to avoid affecting the surface flatness of the composite material, while ensuring that the layers can work together to withstand greater external force. For example, the thickness of the flexible substrate is 0.1mm, and the length of the magnetic fiber is 0.15-0.2mm; the thickness of the rigid substrate is 0.4mm, and the length of the magnetic fiber is 0.6-0.8mm.

[0038] In actual use, the first resin glue and the second resin glue can be diluted to improve the flowability of the resin glue. At this time, the diluting solvent can be selected from one or more of water, methanol, ethanol, ethylene glycol, glycerol, propylene glycol, isomeric decanol, isomeric tridecanol, methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, sec-butyl acetate, amyl acetate, isoamyl acetate, methyl amyl acetate, cyclohexyl acetate, methylcyclohexyl acetate, propyl propionate, n-butyl propionate, amyl propionate, methyl butyrate, ethyl butyrate, n-butyl butyrate, methyl lactate, and ethyl lactate.

[0039] As a second aspect of the present application, a preparation method of a drainage cloth is provided, comprising: impregnating a flexible substrate with a second resin glue to obtain a pre-impregnated flexible substrate; placing the pre-impregnated flexible substrate in a magnetic field, and uniformly dropping magnetic fibers from above the pre-impregnated flexible substrate, so that the magnetic fibers fall onto the surface of the pre-impregnated flexible substrate in an upright state under the action of the magnetic field and gravity, to form a magnetic fiber array; applying pressure to the magnetic fiber array to penetrate the magnetic fiber array into the pre-impregnated flexible substrate, and heating and curing to obtain the drainage cloth.

[0040] In the embodiment of the present application, the rigid substrate is first infiltrated by the second resin glue, then the magnetic fiber array is formed by distributing the magnetic fibers in an upright state on the surface of the flexible substrate, the magnetic fibers fall to the surface of the flexible substrate under the action of the magnetic field and gravity, pressure is applied to the magnetic fiber array to make the magnetic fiber array penetrate the flexible substrate, and after curing, the magnetic fibers are stably fixed in the flexible substrate by the second resin glue. The preparation method of the flow guide cloth provided by the present application has good feasibility, low technical difficulty, high preparation efficiency, is easy to scale, has good controllability, significantly improves the mechanical properties between the composite material layers, and has good industrial application prospects.

[0041] According to the embodiment of the present application, applying pressure to the magnetic fiber array to make the magnetic fiber array penetrate the pre-impregnated flexible substrate includes: applying an external force parallel to the pre-impregnated flexible substrate to the magnetic fiber array to make the magnetic fiber array penetrate the pre-impregnated flexible substrate, and controlling the lengths of the magnetic fiber array on both sides of the pre-impregnated flexible substrate to be equal. For example, a roller can be selected and the roller gap is controlled to apply a force parallel to the pre-impregnated flexible substrate to the magnetic fiber array. It should be understood that at this time, the pre-impregnated flexible substrate has not yet been cured and formed, and the pre-impregnated flexible substrate should be kept in the magnetic field to ensure that the magnetic fibers are in an upright state.

[0042] As a third aspect of the present application, a composite material is provided, comprising: at least two base materials; and the flow guide cloth described above, located between the two adjacent base materials and glued to the base materials by the first resin glue; wherein the magnetic fiber array in the flow guide cloth forms a pinning effect with the first resin glue, thereby improving the mechanical properties of the composite material.

[0043] In the embodiment of the present application, the flow guide cloth is used to prepare a composite material, the flow guide cloth is arranged between two adjacent base materials, and the flow guide cloth and the two adjacent base materials are bonded by the first resin glue. The magnetic fiber array in the flow guide cloth penetrates the flexible substrate and forms a pinning effect with the first resin glue, thereby hindering the initiation and propagation of cracks in the first resin glue and improving the mechanical properties of the composite material.

[0044] As a fourth aspect of the present application, a preparation method of a composite material is provided, comprising: providing at least two base materials, arranging the flow guide cloth between the two adjacent base materials, guiding the first resin glue between the two adjacent base materials by the flow guide cloth, and forming by a forming process to obtain a composite material.

[0045] In the embodiment of the present application, the above flow guide is arranged between two adjacent base materials, and then the first resin glue is poured, and the flow guide and the two adjacent base materials are bonded and solidified by the first resin glue to obtain a composite material. The preparation method of the composite material provided by the present application enhances the interfacial bonding force in the composite material through the interaction between the magnetic fibers in the flow guide and the first resin glue, so that the mechanical properties of the composite material as a whole are significantly improved, the tensile and shear resistance is enhanced, and the demand for more complex working conditions is met.

[0046] According to the embodiment of the present application, the forming process includes any one of a vacuum-assisted resin infusion forming process, a resin transfer molding forming process, a liquid forming process, and a hand lay-up forming process.

[0047] The present application is further illustrated by the following examples and related test experiments. In the following detailed description, many specific details are set forth in order to provide a thorough understanding of the embodiments of the present application. However, it is apparent that one or more embodiments can be practiced without these specific details. In addition, the details in the following embodiments can be combined with each other as long as there is no conflict. All instruments, consumables and reagents used in the following examples can be obtained from commercial channels unless otherwise specified.

[0048] Example 1

[0049] Example 1 of the present application prepared a flow guide cloth by the following method, and used the prepared flow guide cloth to prepare a composite material.

[0050] In Example 1 of the present application, the flexible substrate is a carbon fiber surface felt with a surface density of 5 g / m 2 , a thickness of 50 μm, the magnetic fiber is a nickel-plated carbon fiber with a length of 50-150 μm and a diameter of 7-8 μm, and the adhesive resin solution is an epoxy resin solution with a certain proportion of ethanol solvent for dilution.

[0051] Figure 1 Figure is a schematic diagram of the continuous flow guide preparation process in Example 1 of the present application; Figure 2 Figure is a schematic diagram of the cross section of the nickel-plated carbon fiber roller pressing into the carbon fiber surface felt in Example 1 of the present application.

[0052] As shown in Figure 1 and Figure 2 , the preparation of the flow guide cloth is carried out by the following method.

[0053] The carbon fiber surface felt 1-2 is drawn from the cloth roll 1-1, passes through the resin solution sprayer 2-1, and is uniformly sprayed with a small amount of resin solution to achieve a preliminary wetting state; the wetted carbon fiber surface felt passes through the vibrating screen 2-2, and the vibrating motor 2-3 is installed on both sides of the vibrating screen 2-2; after the vibrating motor 2-3 is started, the nickel-plated carbon fiber 3-1 falls from the vibrating screen 2-2 and is oriented along the magnetic force line direction 4-2 under the action of the first magnet 4-1 during the falling process in the air, and the nickel-plated carbon fiber 3-2 in a vertical state is distributed on the surface of the carbon fiber surface felt 1-2; under the common extrusion action of the first pressure roller 4-41 and the second pressure roller 4-42, the nickel-plated carbon fiber 3-1 is vertically pressed into the carbon fiber surface felt 1-2 (as shown in Figure 2 The first pressure roller 4-41 and the second pressure roller 4-42 are fixed on the first support 4-45 and the second support 4-46 through the first metal shaft 4-43 and the second metal shaft 4-44, respectively; the carbon fiber surface felt loaded with the nickel-plated carbon fiber passes through the heating cavity 5-4, the heating power 5-1 is turned on, the heating cavity 5-4 is powered and heated through the first wire 5-2, the temperature control is transmitted back to the power controller through the thermocouple 5-5 and the second wire 5-3, and temperature control is realized. The carbon fiber surface felt loaded with the nickel-plated carbon fiber is heated, the solvent in the carbon fiber surface felt is volatilized, the resin reaches a preliminary setting and curing state, and the nickel-plated carbon fiber is fixed on the carbon fiber surface felt; the flow guide cloth is wound and stored through the cloth roll 1-3.

[0054] Figure 3 It is a schematic diagram of the flow guide cloth in Example 1 of the present application. Figure 4 It is a scanning electron microscope (SEM) diagram of the flow guide cloth in Example 1 of the present application.

[0055] From Figure 3 and Figure 4 It can be seen that the nickel-plated carbon fiber penetrates through the carbon fiber surface felt and is stably and vertically distributed in the carbon fiber surface felt.

[0056] Further, the prepared flow guide cloth is arranged in the middle of two layers of 0.2 mm thick carbon fiber composite laminated plates, and a 20 μm thick polytetrafluoroethylene film is inserted on one side of the flow guide cloth to prepare a crack. A vacuum infusion method is used to realize the infiltration of the resin solution into the flow guide cloth, and the flow guide cloth is hot-pressed and cured to form a composite material.

[0057] Figure 5 It is a schematic diagram of the vacuum infusion molding device of the composite material in Example 1 of the present application, Figure 6 It is a mechanical test schematic diagram of the carbon fiber composite laminated plate in Example 1 of the present application.

[0058] As Figure 5As shown, first prepare resin solution 6-4 for vacuum infusion, and place it in resin tank 6-3, connect silicone tube 6-2 and glue inlet 6-1, and glue inlet 6-1 passes through sealing glue 7-2 and is placed on mold bottom plate 7-1; Put a layer of flow guide cloth 8-2 between the first plate 8-1 and the second plate 8-3 which need to be secondary cured and molded, and place them together on the mold bottom plate 7-1, seal the sample with sealing glue 7-2 around, and place a layer of release film 7-3 on the upper part of the first plate 8-1, cover the entire plate with vacuum bag 7-4, and press together with the sealing glue, and the air outlet 9-1 passes through the vacuum bag 7-4, and the air outlet tube 9-2 is connected to the vacuum pump 9-3; Before vacuum infusion, first close the silicone tube 6-2 with a clamp, and then a small amount of resin solution 6-4 is pre-filled into the silicone tube 6-2 to fill the pipeline, then open the vacuum pump 9-3, the gas in the vacuum bag is extracted to a vacuum state, close the vacuum pump 9-3 and close the air outlet tube 9-2, open the silicone tube 6-2, the resin solution in the tube flows into the glue inlet 6-1 under atmospheric pressure, and then flows into the vacuum bag 7-4, the resin solution 6-4 flows through the flow guide cloth 8-2 to be completely immersed, and then is cured at room temperature, and after a certain period of time, the carbon fiber composite laminate can be taken out. Finally, cut the carbon fiber composite laminate which is secondary cured and molded into a sample with a width of 1 cm and a length of 15 cm. Place the sample in the clamping head of the universal mechanical testing machine, and test the peel strength of the carbon fiber composite laminate after secondary curing and molding. Figure 6 As shown, the peel strength of the carbon fiber composite laminate after secondary curing and molding is tested and evaluated.

[0059] Figure 7 The figure shows the peel strength test results of different carbon fiber composite laminates in Example 1 of the present application. In addition to the carbon fiber composite laminate prepared by using the carbon fiber surface felt with plated nickel fiber on the surface, a carbon fiber composite laminate without flow guide cloth and a carbon fiber composite laminate using only carbon fiber surface felt as flow guide cloth are also prepared.

[0060] As shown in Figure 7 The areal density of the plated nickel carbon fiber implanted in the carbon fiber composite laminate is 0.5 g / m 2 The peel strength of the carbon fiber composite laminate without flow guide cloth is 2.59 N / cm, the peel strength of the carbon fiber composite laminate with carbon fiber surface felt interlayer is 3.12 N / cm, and the peel strength of the carbon fiber composite laminate with flow guide cloth is 4.10 N / cm. The results show that the peel strength of the carbon fiber composite laminate with flow guide cloth is improved by 58.3% compared with the carbon fiber composite laminate without flow guide cloth, and improved by 31.4% compared with the carbon fiber composite laminate with carbon fiber surface felt interlayer.

[0061] The above-described specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application, and it should be understood that the above-described is only a specific embodiment of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A flow guide cloth, comprising: a flexible substrate; and an array of magnetic fibers penetrating through the flexible substrate in an upright state; wherein the flow guide cloth is disposed in the middle of a double-layer material, and a pinning effect is formed between the array of magnetic fibers and a first resin glue solidified and formed in the double-layer material, thereby improving the mechanical properties of a composite material formed by the double-layer material, the flow guide cloth, and the first resin glue; the thickness of the flexible substrate is 0.05-0.5 mm; the diameter of the magnetic fibers is 5-300 μm, and the length of the magnetic fibers is 0.15-0.8 mm; the length of the magnetic fibers exposed outside the flexible substrate is 0.1-0.3 mm; the magnetic fibers are adhered to the flexible substrate by a second resin glue; the flexible substrate comprises any one of a fabric prepared from continuous fibers or a non-woven fabric prepared from short fibers; the first resin glue and the second resin glue each comprise at least one of a thermosetting resin or a thermoplastic resin; and the magnetic fibers comprise at least one of stainless steel fibers, nickel-plated fibers, or fibers coated with a layer of ferroferric oxide. The fibers used to prepare the flexible substrate comprise at least one of carbon fibers, glass fibers, basalt fibers, polypropylene fibers, polyethylene fibers, or polyamide fibers; the thermosetting resin comprises at least one of an epoxy resin, a polyurethane, an unsaturated polyester, or a phenolic resin; the thermoplastic resin comprises at least one of polyvinyl alcohol, polyvinyl butyral, polyvinyl acetate, polyester, polyacrylate, rosin-modified alkyd resin, polyvinyl chloride, chlorinated polypropylene, or alcohol-soluble polyamide; the nickel-plated fibers comprise at least one of nickel-plated carbon fibers, nickel-plated glass fibers, nickel-plated basalt fibers, nickel-plated aramid fibers, nickel-plated liquid crystal fibers, or nickel-plated polyamide fibers; and the fibers coated with a layer of ferroferric oxide comprise at least one of carbon fibers coated with ferroferric oxide, glass fibers coated with ferroferric oxide, basalt fibers coated with ferroferric oxide, aramid fibers coated with ferroferric oxide, liquid crystal fibers coated with ferroferric oxide, or polyamide fibers coated with ferroferric oxide. 3.A method for preparing the flow guide cloth according to any one of claims 1-2, comprising: impregnating a flexible substrate with a second resin glue to obtain a pre-impregnated flexible substrate; placing the pre-impregnated flexible substrate in a magnetic field, and uniformly dropping magnetic fibers from above the pre-impregnated flexible substrate, so that the magnetic fibers fall onto the surface of the pre-impregnated flexible substrate in an upright state under the action of the magnetic field and gravity, thereby forming an array of magnetic fibers; and applying pressure to the array of magnetic fibers to penetrate the array of magnetic fibers through the pre-impregnated flexible substrate, and heating and solidifying to obtain the flow guide cloth. 4.A composite material, comprising: at least two base materials; and a flow guide cloth according to any one of claims 1-2, disposed between two adjacent base materials and glued to the base materials by a first resin glue; wherein a pinning effect is formed between the array of magnetic fibers in the flow guide cloth and the first resin glue, thereby improving the mechanical properties of the composite material. 5.A method for preparing the composite material according to claim 4, comprising: ​ ​ ​ ​ the load of the magnetic fibers on the flexible substrate is 10-200 fibers / cm 2 ; ​ ​ ​ ​ 2. The flow guide cloth according to claim 1, wherein, ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The application provides at least two base materials, a flow guide is arranged between two adjacent base materials, a first resin glue is guided to the space between the two adjacent base materials through the flow guide, and a composite material is obtained through a molding process.

6. The method of claim 5, wherein, The molding process includes any one of a vacuum-assisted resin infusion molding process, a resin transfer molding process, a liquid molding process and a hand lay-up molding process.

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