Toughened high-elasticity racket inner core structure and preparation method thereof

Abstract

The invention discloses a toughened high-elastic racket inner core structure and a preparation method thereof, the toughened high-elastic racket inner core structure comprises a main body, the main body comprises a carbon fiber coating layer, a surface physical friction layer, two nano fusion layers, a PP honeycomb, a mixed molecule foam frame, a foaming edge, two interwoven carbon beds, inner core filling, a high-elastic EVA layer and a bottom plate, the surface physical friction layer is bonded to the top of the interwoven carbon bed at the upper position, the interwoven carbon bed at the upper position is bonded to the top of the nano fusion layer, and the PP honeycomb is installed on the inner side of the foaming edge. The stability and the strength of the whole structure of the ball Pick racket are improved, the elasticity, the structural strength and the shock absorption and noise reduction effects of the Pick racket are improved, the whole ball hitting comfort of the racket is improved, and honeycomb recesses in the using process are permanently solved.

Description

Technical Field

[0001] The invention relates to the technical field of racket inner cores, and in particular to a racket inner core structure with toughening and high elasticity and a preparation method thereof. Background Art

[0002] The traditional process is to produce honeycomb core for pure PP, which is made by PP extrusion-splicing-cutting-covering. There are two disadvantages in this method. First, the PP hot pressing integrated molding is deformed by heat, resulting in a decrease in the strength of the product. Second, there is no large support force at the center of the PP aperture to support the surface fibers, which affects the flatness of the racket surface. After the racket is heated during integrated thermosetting molding (the grip back cover is made in one piece), it shrinks and deforms to varying degrees. After long-term use, the racket surface has different degrees of honeycomb hole collapse marks, which affects the physical feel of hitting the ball. Therefore, the present invention proposes a racket inner core structure with toughening and high elasticity and a preparation method thereof to solve the above problems. Summary of the invention

[0003] Based on the background technology, there are technical problems that, first, PP hot-pressed one-piece molding is deformed due to heat, resulting in a decrease in the strength of the product; second, there is no large supporting force in the center of the PP aperture to support the surface fibers, which affects the flatness of the racket surface. After the racket is heated during one-piece thermosetting molding (the grip and back cover are made in one piece), it shrinks and deforms to varying degrees. After long-term use, the racket surface has different degrees of honeycomb hole collapse marks, which affects the physical feel of hitting the ball. The present invention proposes a racket core structure with toughening and high elasticity and a preparation method thereof.

[0004] The present invention proposes a toughened high-elastic racket core structure, which includes the following raw materials: a main body, wherein the main body includes a carbon fiber coating layer, a surface physical friction layer, two nano-fusion layers, a PP honeycomb, a mixed molecular foam frame, a foaming edge, two interwoven carbon beds, an inner core filling, a high-elastic EVA layer and a bottom plate, wherein the surface physical friction layer is bonded to the top of the interwoven carbon bed at the upper position, the interwoven carbon bed at the upper position is bonded to the top of the nano-fusion layer, the PP honeycomb is installed on the inner side of the foaming edge, the inner core filling is installed on the inner side of the PP honeycomb, the foaming edge is installed on the inner side of the mixed molecular foam frame, and the high The elastic EVA layer is wrapped around the outside of the mixed molecular foam frame, the nano-fusion layers at the upper position are respectively installed on the top of the inner core filling, PP honeycomb, foaming edge, mixed molecular foam frame and high-elastic EVA layer, the nano-fusion layer at the lower position is installed on the bottom of the inner core filling, PP honeycomb, foaming edge, mixed molecular foam frame and high-elastic EVA layer, the interwoven carbon bed at the lower position is installed on the bottom of the nano-fusion layer, the bottom plate is installed on the top of the interwoven carbon bed at the lower position, and the edge protection cover is installed on the outside of the surface physical friction layer, two nano-fusion layers, two interwoven carbon beds, high-elastic EVA layer and the bottom plate.

[0005] Preferably, the high-elastic EVA layer and the interwoven carbon bed are both made of carbon fiber, the specific material of the surface physical friction layer is polyurethane foam, and the specific material of the bottom plate is nano foam.

[0006] Preferably, the PP honeycomb is made by mixing polyethylene, polyester, polycarbonate and a foaming agent, and the ratio thereof is 1-5:3-9:1-8:1-5.

[0007] Preferably, the inner core is filled with polypropylene and a toughening agent in a ratio of 1-8:1-5.

[0008] The present invention also proposes a method for preparing a toughened high-elastic racket core structure, comprising the following steps:

[0009] S1: Prepare materials;

[0010] S2: extrusion bonding;

[0011] S3: Bonding and stamping.

[0012] Preferably, in the step S1, firstly, PP material is selected, toughening agent is added to the PP material according to the proportion, and the material is added to the inner side of the mixer and stirred for 10-15 minutes at a temperature of 30-50 degrees Celsius and a rotation speed of 50-120 revolutions per minute.

[0013] Preferably, in the step S2, the PP material is extruded into the required aperture through a screw extruder, and after cooling and forming, the PP material is spliced ​​and bonded at high temperature, and then cut to produce a toughened honeycomb sheet with the required aperture thickness. After the sheet is cut according to the shape, the surface is coated with glue on one side and bonded with 80-100 g non-woven fabric to form the honeycomb sheet.

[0014] Preferably, in the step S3, a honeycomb panel is punched out using a corresponding racket-shaped cutting die according to the racket shape, and a set weight of foamed granular powder is sprinkled into the aperture of the punched single-sided honeycomb core, and the aperture must be uniform. After the granular powder is sprinkled, the surface is bonded with a resin film to seal the surface of the honeycomb hole, and the surface is coated with carbon fiber material and placed in a product steel mold, which is then placed in a 120T hot press machine at a temperature of 135-150 degrees Celsius for 40-50 minutes. The mold is pulled out and placed in a cold press machine for cooling. After cooling, the product is taken out, and the product blank is completed. The other layers of the racket are bonded and assembled, and the toughened and high-elastic racket is completed.

[0015] Beneficial effects of the present invention:

[0016] 1. This production process uses PP toughening and fills the pores with foam particles. The foam particles expand when heated and effectively support the pores, which can perfectly solve the problem of better bonding between the pores and the surface materials.

[0017] 2. This production process combines a foamed inner core with a carbon fiber structural layer. The carbon fiber structural layer provides strength while the foamed inner core provides elasticity. The unfilled honeycomb core is prone to surface collapse and affects the hitting of the ball under the condition of hitting vibration. The foamed filled honeycomb pore size and toughened PP can effectively be more compatible with the epoxy resin in the surface carbon fiber composite material. It can be completely attached to the carbon fiber surface without any dents.

[0018] The filling technology in the present invention can be thermoset with the fiber material on the surface of the racket. The core material does not need secondary cutting, gluing, and compounding processes, and can rebound permanently, thereby improving the stability and strength of the overall structure of the pickle ball racket, thereby improving the elasticity, structural strength, shock absorption and noise reduction effects of the pickle ball racket, improving the overall hitting comfort of the racket, and permanently solving the problem of honeycomb depression during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A side cross-sectional view of the structure proposed by the present invention;

[0020] Figure 2 A top view of the structure provided by the present invention;

[0021] Figure 3 The working flow diagram proposed for the present invention;

[0022] Figure 4 This is a flow chart of the PP cellular main view proposed by the present invention;

[0023] Figure 5 This is a front view of the PP honeycomb and inner core filling proposed by the present invention.

[0024] In the figure: 1. Carbon fiber coating; 2. Surface physical friction layer; 3. Interwoven carbon bed; 4. Nano-fusion layer; 5. High-elastic EVA layer; 6. Foaming edge; 7. Mixed molecular foam frame; 8. PP honeycomb; 9. Inner core filling; 10. Bottom plate. DETAILED DESCRIPTION

[0025] The present invention will be further explained below in conjunction with specific embodiments.

[0026] Reference Figure 1-Figure 5 , Embodiment 1

[0027] The present embodiment provides a toughened high-elastic racket core structure, including a main body, the main body including a carbon fiber coating layer 1, a surface physical friction layer 2, two nano-fusion layers 4, a PP honeycomb 8, a mixed molecular foam frame 7, a foaming edge 6, two interwoven carbon beds 3, an inner core filling 9, a high-elastic EVA layer 5 and a bottom plate 10, the surface physical friction layer 2 is bonded to the top of the interwoven carbon bed 3 at the upper position, the interwoven carbon bed 3 at the upper position is bonded to the top of the nano-fusion layer 4, the PP honeycomb 8 is installed on the inner side of the foaming edge 6, the inner core filling 9 is installed on the inner side of the PP honeycomb 8, the foaming edge 6 is installed on the inner side of the mixed molecular foam frame 7, the high-elastic EVA layer 5 is wrapped on the outer side of the mixed molecular foam frame 7, and the nano-fusion layer 4 at the upper position is installed on the inner core filling 9, the PP honeycomb 8, the foaming edge 6, the mixed molecular foam frame 7 and The top of the high-elastic EVA layer 5, the nano-fusion layer 4 at the lower position is installed on the bottom of the inner core filling 9, PP honeycomb 8, foaming edge 6, mixed molecular foam frame 7 and the high-elastic EVA layer 5, the interwoven carbon bed 3 at the lower position is installed on the bottom of the nano-fusion layer 4, the bottom plate 10 is installed on the top of the interwoven carbon bed 3 at the lower position, the edge protection cover is installed on the outside of the surface physical friction layer 2, two nano-fusion layers 4, two interwoven carbon beds 3, high-elastic EVA layer 5 and the bottom plate 10, the high-elastic EVA layer 5 and the interwoven carbon bed 3 are both made of carbon fiber, the specific material of the surface physical friction layer 2 is polyurethane foam, the specific material of the bottom plate 10 is nano-foam, the PP honeycomb 8 is a mixture of polyethylene, polyester, polycarbonate and foaming agent, and the ratio is 2:4:3:2, the inner core filling 9 is a mixture of polypropylene and toughening agent, and the ratio is 8:2.

[0028] The present invention also proposes a method for preparing a toughened high-elastic racket core structure, comprising the following steps:

[0029] S1: Prepare the materials. First, select PP material, add toughening agent to the PP material according to the ratio, and add it to the inside of the mixer and stir for 10 minutes at a temperature of 45 degrees Celsius and a speed of 80 revolutions per minute;

[0030] S2: Extrusion bonding, PP material is extruded through a screw extruder to extrude the required aperture, and after cooling and forming, the PP material is spliced ​​and bonded at high temperature, and then cut to produce the required aperture thickness toughened honeycomb sheet. After the sheet is cut according to the shape, the surface is glued on one side and bonded with 88g non-woven fabric to form the honeycomb sheet.

[0031] S3: Bonding and stamping. Make a corresponding racket-shaped cutting die according to the racket shape to punch the honeycomb panel. Sprinkle the set weight of foamed granular powder into the aperture of the punched single-sided honeycomb core. The hole must be uniform. After the granular powder is sprinkled, the surface is bonded with a resin film to seal the surface of the honeycomb hole. The surface is coated with carbon fiber material and put into the product steel mold. Put it into a 120T hot press machine at a temperature of 140 degrees Celsius for 40 minutes. Pull out the mold and put it into a cold press machine for cooling. After cooling, take out the product. The product blank is completed. The other layers of the racket are bonded and assembled, and the toughened and high-elastic racket is completed.

[0032] Reference Figure 1-Figure 5 , Embodiment 2

[0033] The present embodiment provides a toughened high-elastic racket core structure, including a main body, the main body including a carbon fiber coating layer 1, a surface physical friction layer 2, two nano-fusion layers 4, a PP honeycomb 8, a mixed molecular foam frame 7, a foaming edge 6, two interwoven carbon beds 3, an inner core filling 9, a high-elastic EVA layer 5 and a bottom plate 10, the surface physical friction layer 2 is bonded to the top of the interwoven carbon bed 3 at the upper position, the interwoven carbon bed 3 at the upper position is bonded to the top of the nano-fusion layer 4, the PP honeycomb 8 is installed on the inner side of the foaming edge 6, the inner core filling 9 is installed on the inner side of the PP honeycomb 8, the foaming edge 6 is installed on the inner side of the mixed molecular foam frame 7, the high-elastic EVA layer 5 is wrapped on the outer side of the mixed molecular foam frame 7, and the nano-fusion layer 4 at the upper position is installed on the inner core filling 9, the PP honeycomb 8, the foaming edge 6, the mixed molecular foam frame 7 and The top of the high-elastic EVA layer 5, the nano-fusion layer 4 at the lower position is installed on the bottom of the inner core filling 9, PP honeycomb 8, foaming edge 6, mixed molecular foam frame 7 and the high-elastic EVA layer 5, the interwoven carbon bed 3 at the lower position is installed on the bottom of the nano-fusion layer 4, the bottom plate 10 is installed on the top of the interwoven carbon bed 3 at the lower position, the edge protection cover is installed on the outside of the surface physical friction layer 2, two nano-fusion layers 4, two interwoven carbon beds 3, high-elastic EVA layer 5 and the bottom plate 10, the high-elastic EVA layer 5 and the interwoven carbon bed 3 are both made of carbon fiber, the specific material of the surface physical friction layer 2 is polyurethane foam, the specific material of the bottom plate 10 is nano-foam, the PP honeycomb 8 is a mixture of polyethylene, polyester, polycarbonate and foaming agent, and the ratio is 2:4:2:3, the inner core filling 9 is a mixture of polypropylene and toughening agent, and the ratio is 7:3.

[0034] The present invention also proposes a method for preparing a toughened high-elastic racket core structure, comprising the following steps:

[0035] S1: Prepare the materials. First, select PP material, add toughening agent to the PP material according to the ratio, and add it to the inside of the mixer and stir for 14 minutes at a temperature of 35 degrees Celsius and a speed of 110 revolutions per minute;

[0036] S2: Extrusion bonding, PP material is extruded through a screw extruder to extrude the required aperture, and after cooling and forming, the PP material is spliced ​​and bonded at high temperature, and then cut to produce the required aperture thickness toughened honeycomb sheet. After the sheet is cut according to the shape, the surface is glued on one side and bonded with 90g non-woven fabric to form the honeycomb sheet.

[0037] S3: Bonding and stamping. Make a corresponding racket-shaped cutting die according to the racket shape to punch the honeycomb panel. Sprinkle the set weight of foamed granular powder into the aperture of the punched single-sided honeycomb core. The hole must be uniform. After the granular powder is sprinkled, the surface is bonded with a resin film to seal the surface of the honeycomb hole. The surface is coated with carbon fiber material and put into the product steel mold. Put it into a 120T hot press machine at a temperature of 135 degrees Celsius for 40 minutes. Pull out the mold and put it into a cold press machine for cooling. After cooling, take out the product. The product blank is completed. The other layers of the racket are bonded and assembled, and the toughened and high-elastic racket is completed.

[0038] Reference Figure 1-Figure 5 , Embodiment 3

[0039] The present embodiment provides a toughened high-elastic racket core structure, including a main body, the main body including a carbon fiber coating layer 1, a surface physical friction layer 2, two nano-fusion layers 4, a PP honeycomb 8, a mixed molecular foam frame 7, a foaming edge 6, two interwoven carbon beds 3, an inner core filling 9, a high-elastic EVA layer 5 and a bottom plate 10, the surface physical friction layer 2 is bonded to the top of the interwoven carbon bed 3 at the upper position, the interwoven carbon bed 3 at the upper position is bonded to the top of the nano-fusion layer 4, the PP honeycomb 8 is installed on the inner side of the foaming edge 6, the inner core filling 9 is installed on the inner side of the PP honeycomb 8, the foaming edge 6 is installed on the inner side of the mixed molecular foam frame 7, the high-elastic EVA layer 5 is wrapped on the outer side of the mixed molecular foam frame 7, and the nano-fusion layer 4 at the upper position is installed on the inner core filling 9, the PP honeycomb 8, the foaming edge 6, the mixed molecular foam frame 7 and The top of the high-elastic EVA layer 5, the nano-fusion layer 4 at the lower position is installed on the bottom of the inner core filling 9, PP honeycomb 8, foaming edge 6, mixed molecular foam frame 7 and the high-elastic EVA layer 5, the interwoven carbon bed 3 at the lower position is installed on the bottom of the nano-fusion layer 4, the bottom plate 10 is installed on the top of the interwoven carbon bed 3 at the lower position, the edge protection cover is installed on the outside of the surface physical friction layer 2, two nano-fusion layers 4, two interwoven carbon beds 3, high-elastic EVA layer 5 and the bottom plate 10, the high-elastic EVA layer 5 and the interwoven carbon bed 3 are both made of carbon fiber, the specific material of the surface physical friction layer 2 is polyurethane foam, the specific material of the bottom plate 10 is nano-foam, the PP honeycomb 8 is a mixture of polyethylene, polyester, polycarbonate and foaming agent, and the ratio is 5:4:3:2, the inner core filling 9 is a mixture of polypropylene and toughening agent, and the ratio is 6:4.

[0040] The present invention also proposes a method for preparing a toughened high-elastic racket core structure, comprising the following steps:

[0041] S1: Prepare materials. First, select PP material, add toughening agent to PP material according to the proportion, and add it to the inside of the mixer and stir for 15 minutes at a temperature of 50 degrees Celsius and a speed of 70 revolutions per minute;

[0042] S2: Extrusion bonding, PP material is extruded through a screw extruder to extrude the required aperture, and after cooling and forming, the PP material is spliced ​​and bonded at high temperature, and then cut to produce the required aperture thickness toughened honeycomb sheet. After the sheet is cut according to the shape, the surface is glued on one side and bonded with 88g non-woven fabric to form the honeycomb sheet.

[0043] S3: Bonding and stamping. Make a corresponding racket-shaped cutting die according to the racket shape to punch the honeycomb panel. Sprinkle the set weight of foamed granular powder into the aperture of the punched single-sided honeycomb core. The hole must be uniform. After the granular powder is sprinkled, the surface is bonded with a resin film to seal the surface of the honeycomb hole. The surface is coated with carbon fiber material and put into the product steel mold. Put it into a 120T hot press machine at a temperature of 138 degrees Celsius for 48 minutes. Pull out the mold and put it into a cold press machine for cooling. After cooling, take out the product. The product blank is completed. The other layers of the racket are bonded and assembled, and the toughened and high-elastic racket is completed.

[0044] Reference Figure 1-Figure 5 , Embodiment 4

[0045] The present embodiment provides a toughened high-elastic racket core structure, including a main body, the main body including a carbon fiber coating layer 1, a surface physical friction layer 2, two nano-fusion layers 4, a PP honeycomb 8, a mixed molecular foam frame 7, a foaming edge 6, two interwoven carbon beds 3, an inner core filling 9, a high-elastic EVA layer 5 and a bottom plate 10, the surface physical friction layer 2 is bonded to the top of the interwoven carbon bed 3 at the upper position, the interwoven carbon bed 3 at the upper position is bonded to the top of the nano-fusion layer 4, the PP honeycomb 8 is installed on the inner side of the foaming edge 6, the inner core filling 9 is installed on the inner side of the PP honeycomb 8, the foaming edge 6 is installed on the inner side of the mixed molecular foam frame 7, the high-elastic EVA layer 5 is wrapped on the outer side of the mixed molecular foam frame 7, and the nano-fusion layer 4 at the upper position is installed on the inner core filling 9, the PP honeycomb 8, the foaming edge 6, the mixed molecular foam frame 7 and The top of the high-elastic EVA layer 5, the nano-fusion layer 4 at the lower position is installed on the bottom of the inner core filling 9, PP honeycomb 8, foaming edge 6, mixed molecular foam frame 7 and the high-elastic EVA layer 5, the interwoven carbon bed 3 at the lower position is installed on the bottom of the nano-fusion layer 4, the bottom plate 10 is installed on the top of the interwoven carbon bed 3 at the lower position, the edge protection cover is installed on the outside of the surface physical friction layer 2, two nano-fusion layers 4, two interwoven carbon beds 3, high-elastic EVA layer 5 and the bottom plate 10, the high-elastic EVA layer 5 and the interwoven carbon bed 3 are both made of carbon fiber, the specific material of the surface physical friction layer 2 is polyurethane foam, the specific material of the bottom plate 10 is nano-foam, the PP honeycomb 8 is a mixture of polyethylene, polyester, polycarbonate and foaming agent, and the ratio is 1:8:2:3, the inner core filling 9 is a mixture of polypropylene and toughening agent, and the ratio is 8:2.

[0046] The present invention also proposes a method for preparing a toughened high-elastic racket core structure, comprising the following steps:

[0047] S1: Prepare the materials. First, select PP material, add toughening agent to the PP material according to the ratio, and add it to the inside of the mixer and stir for 15 minutes at a temperature of 35 degrees Celsius and a speed of 115 revolutions per minute;

[0048] S2: Extrusion bonding, PP material is extruded through a screw extruder to extrude the required aperture, and after cooling and forming, the PP material is spliced ​​and bonded at high temperature, and then cut to produce the required aperture thickness toughened honeycomb sheet. After the sheet is cut according to the shape, the surface is glued on one side and bonded with 95g non-woven fabric to form the honeycomb sheet.

[0049] S3: Bonding and stamping. Make a corresponding racket-shaped cutting die according to the racket shape to punch the honeycomb panel. Sprinkle the set weight of foamed granular powder into the aperture of the punched single-sided honeycomb core. The hole must be uniform. After the granular powder is sprinkled, the surface is bonded with a resin film to seal the surface of the honeycomb hole. The surface is coated with carbon fiber material and put into the product steel mold. Put it into a 120T hot press machine at a temperature of 150 degrees Celsius for 48 minutes. Pull out the mold and put it into a cold press machine for cooling. After cooling, take out the product. The product blank is completed. The other layers of the racket are bonded and assembled, and the toughened and high-elastic racket is completed.

[0050] Reference Figure 1-Figure 5 Embodiment 5

[0051] The present embodiment provides a toughened high-elastic racket core structure, including a main body, the main body including a carbon fiber coating layer 1, a surface physical friction layer 2, two nano-fusion layers 4, a PP honeycomb 8, a mixed molecular foam frame 7, a foaming edge 6, two interwoven carbon beds 3, an inner core filling 9, a high-elastic EVA layer 5 and a bottom plate 10, the surface physical friction layer 2 is bonded to the top of the interwoven carbon bed 3 at the upper position, the interwoven carbon bed 3 at the upper position is bonded to the top of the nano-fusion layer 4, the PP honeycomb 8 is installed on the inner side of the foaming edge 6, the inner core filling 9 is installed on the inner side of the PP honeycomb 8, the foaming edge 6 is installed on the inner side of the mixed molecular foam frame 7, the high-elastic EVA layer 5 is wrapped on the outer side of the mixed molecular foam frame 7, and the nano-fusion layer 4 at the upper position is installed on the inner core filling 9, the PP honeycomb 8, the foaming edge 6, the mixed molecular foam frame 7 and The top of the high-elastic EVA layer 5, the nano-fusion layer 4 at the lower position is installed on the bottom of the inner core filling 9, PP honeycomb 8, foaming edge 6, mixed molecular foam frame 7 and the high-elastic EVA layer 5, the interwoven carbon bed 3 at the lower position is installed on the bottom of the nano-fusion layer 4, the bottom plate 10 is installed on the top of the interwoven carbon bed 3 at the lower position, the edge protection cover is installed on the outside of the surface physical friction layer 2, two nano-fusion layers 4, two interwoven carbon beds 3, high-elastic EVA layer 5 and the bottom plate 10, the high-elastic EVA layer 5 and the interwoven carbon bed 3 are both made of carbon fiber, the specific material of the surface physical friction layer 2 is polyurethane foam, the specific material of the bottom plate 10 is nano-foam, the PP honeycomb 8 is a mixture of polyethylene, polyester, polycarbonate and foaming agent, and the ratio is 5:9:2:3, the inner core filling 9 is a mixture of polypropylene and toughening agent, and the ratio is 2:3.

[0052] The present invention also proposes a method for preparing a toughened high-elastic racket core structure, comprising the following steps:

[0053] S1: Prepare the materials. First, select PP material, add toughening agent to the PP material according to the ratio, and add it to the inside of the mixer and stir for 12 minutes at a temperature of 35 degrees Celsius and a speed of 70 revolutions per minute;

[0054] S2: Extrusion bonding, PP material is extruded through a screw extruder to extrude the required aperture, and after cooling and forming, the PP material is spliced ​​and bonded at high temperature, and then cut to produce the required aperture thickness toughened honeycomb sheet. After the sheet is cut according to the shape, the surface is glued on one side and bonded with 82g non-woven fabric to form the honeycomb sheet.

[0055] S3: Bonding and stamping. Make a corresponding racket-shaped cutting die according to the racket shape to punch the honeycomb panel. Sprinkle the set weight of foamed granular powder into the aperture of the punched single-sided honeycomb core. The hole must be uniform. After the granular powder is sprinkled, the surface is bonded with a resin film to seal the surface of the honeycomb hole. The surface is coated with carbon fiber material and put into the product steel mold. Put it into a 120T hot press machine at a temperature of 140 degrees Celsius for 43 minutes. Pull out the mold and put it into a cold press machine for cooling. After cooling, take out the product. The product blank is completed. The other layers of the racket are bonded and assembled. The toughened and high-elastic racket is completed.

[0056] Comparing the conventional bulletproof and stab-proof materials with the bulletproof and stab-proof materials prepared in Examples 1 to 5, the bulletproof and stab-proof materials prepared in Examples 1 to 5 are shown in the following table:

[0057]

[0058] It can be seen from the above table that the toughened high-elastic racket core structure and the preparation method thereof proposed by the present invention have obvious improvements, and implementation 2 is the best embodiment.

[0059] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A toughened high-elastic racket core structure, comprising a main body, characterized in that: The main body comprises a carbon fiber coating layer (1), a surface physical friction layer (2), two nano-fusion layers (4), a PP honeycomb (8), a mixed molecular foam frame (7), a foaming edge (6), two interwoven carbon beds (3), an inner core filling (9), a high-elastic EVA layer (5) and a bottom plate (10), wherein the surface physical friction layer (2) is bonded to the top of the interwoven carbon bed (3) at the upper position, the interwoven carbon bed (3) at the upper position is bonded to the top of the nano-fusion layer (4), the PP honeycomb (8) is installed on the inner side of the foaming edge (6), the inner core filling (9) is installed on the inner side of the PP honeycomb (8), the foaming edge (6) is installed on the inner side of the mixed molecular foam frame (7), and the high-elastic EVA layer (5) is wrapped in the mixed molecular foam frame (7). The outer side of the nano-fusion layer (4) at the upper position is respectively installed on the top of the inner core filling (9), the PP honeycomb (8), the foaming edge (6), the mixed molecular foam frame (7) and the high elastic EVA layer (5); the nano-fusion layer (4) at the lower position is installed on the bottom of the inner core filling (9), the PP honeycomb (8), the foaming edge (6), the mixed molecular foam frame (7) and the high elastic EVA layer (5); the interwoven carbon bed (3) at the lower position is installed on the bottom of the nano-fusion layer (4); the bottom plate (10) is installed on the top of the interwoven carbon bed (3) at the lower position; and the edge protection cover is installed on the outer side of the surface physical friction layer (2), the two nano-fusion layers (4), the two interwoven carbon beds (3), the high elastic EVA layer (5) and the bottom plate (10).

2. The inner core structure of a racket with toughening and high elasticity according to claim 1, characterized in that: The high-elastic EVA layer (5) and the interwoven carbon bed (3) are both made of carbon fiber materials, the specific material of the surface physical friction layer (2) is polyurethane foam, and the specific material of the bottom plate (10) is nano foam.

3. The inner core structure of a racket with toughening and high elasticity according to claim 1, characterized in that: The PP honeycomb (8) is made by mixing polyethylene, polyester, polycarbonate and a foaming agent, and the ratio thereof is 1-5:3-9:1-8:1-5.

4. The inner core structure of a racket with toughening and high elasticity according to claim 1, characterized in that: The inner core filling (9) is prepared by mixing polypropylene and a toughening agent, and the ratio thereof is 1-8:1-5.

5. A method for preparing a toughened high-elastic racket core structure, characterized in that: The following steps are involved: S1: Prepare materials; S2: extrusion bonding; S3: Bonding and stamping.

6. The method for preparing a toughened high-elastic racket core structure according to claim 5, characterized in that: In the step S1, firstly, PP material is selected, toughening agent is added to the PP material according to the proportion, and the material is added to the inner side of the mixer and stirred for 10-15 minutes at a temperature of 30-50 degrees Celsius and a rotation speed of 50-120 revolutions per minute.

7. The method for preparing a toughened high-elastic racket core structure according to claim 5, characterized in that: In the step S2, the PP material is extruded through a screw extruder to form the required aperture. After cooling and forming, the PP material is spliced ​​and bonded at high temperature to form the required aperture thickness toughened honeycomb sheet material by cutting. After the sheet material is cut according to the shape, the surface is coated with glue on one side and bonded with 80-100g non-woven fabric to form the honeycomb sheet material.

8. The method for preparing a toughened high-elastic racket core structure according to claim 5, characterized in that: In the step S3, a honeycomb panel is punched out according to a corresponding racket-shaped cutting die according to the racket shape, and a set weight of foamed granular powder is sprinkled into the aperture of the punched single-sided honeycomb core, and the aperture must be uniform. After the granular powder is sprinkled, the surface is bonded with a resin film to seal the surface of the honeycomb hole, and the surface is coated with carbon fiber material and placed in a product steel mold, and then placed in a 120T hot press machine at a temperature of 135-150 degrees Celsius for 40-50 minutes. The mold is pulled out and placed in a cold press machine for cooling. After cooling, the product is taken out, and the product blank is completed. The other layers of the racket are bonded and assembled, and the toughened and high-elastic racket is completed.

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