Snowboard and manufacturing method

Abstract

The invention discloses a snowboard and a manufacturing method, the snowboard is characterized in that the snowboard comprises a board waist, an upwarping plate head located at the head of the board waist and an upwarping plate tail located at the tail of the board waist, and the upwarping plate head and the upwarping plate tail of the board waist are both made of carbon fiber materials; a cavity is formed in the plate waist, and a light filling layer is filled in the cavity. In order to overcome the defects in the prior art, the invention provides the snowboard which is simple in structure, light in weight and high in strength and the manufacturing method.

Description

Technical Field

[0001] The present invention relates to the technical field of snowboards, and particularly relates to a snowboard and a manufacturing method thereof. Background Art

[0002] Skiing is an extreme sport with relatively high requirements for conditions such as skiing speed, skiing movements, and skiing environment. Therefore, the snowboard must have sufficient strength and elasticity to prevent the board body from deforming or the material bonding joints from cracking due to excessive pressure during skiing. The structure of traditional snowboards is a sandwich structure design, namely a faceplate, a bottom plate, and a core, and each layer is pressed by multiple layers of materials such as wood or fiberglass.

[0003] In order to ensure that the snowboard has sufficient strength, the snowboard is generally set to be relatively heavy to ensure sufficient safety. However, the heavier the snowboard is set, the more it will affect the overall operation during skiing. Therefore, how to balance the weight and quality of the snowboard has always been a difficult problem. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a snowboard and a manufacturing method thereof with a simple structure, light weight, and high strength.

[0005] Regarding the snowboard, in order to achieve the above purpose, the present invention adopts the following scheme: A snowboard, characterized in that: it includes a waist, an upturned nose located at the head of the waist, and an upturned tail located at the tail of the waist, and the upturned nose and upturned tail of the waist are both made of carbon fiber material; a cavity is provided in the waist, and a lightweight filling layer is filled in the cavity.

[0006] As another improvement of the snowboard of the present invention, a support skeleton is provided in the cavity. The support skeleton can be made of lightweight materials such as carbon fiber or fiberglass.

[0007] As another improvement of the snowboard of the present invention, the support skeleton and the inner wall of the waist are integrally formed.

[0008] As another improvement of the snowboard of the present invention, a number of hollow grooves are provided at intervals or continuously on the lightweight filling layer, and the support skeleton is arranged in the hollow grooves.

[0009] As another improvement of the snowboard of the present invention, the lightweight filling layer is a polymethacrylimide layer.

[0010] The method for manufacturing the snowboard as described in any one of the above, characterized by including the following steps: S1. Manufacture polymethacrylimide foam: S11. Weigh 30 - 70 parts by weight of methacrylic acid, 40 - 50 parts by weight of methacrylonitrile, 0.2 - 0.6 parts by weight of allyl methacrylate, 0.01 - 0.05 parts by weight of wollastonite, 0.1 - 0.12 parts by weight of tert-butyl perbenzoate, and 1.2 - 1.8 parts by weight of butyl acetate, and mix them to obtain mixture A. S12. Heat the liquid mixture A to 75 - 85 °C and react for 2 - 8 h to obtain solid mixture B. S13. Heat the mold to 120 - 140 °C, add the solid mixture B obtained in step S12, close the mold and keep it warm for reaction for 3 - 5 h, then heat the foam molding mold to 160 - 180 °C and react for 10 - 20 h, and cool it to room temperature to obtain the polymethacrylimide foam. S2. Lay a layer of carbon fiber layer in each of the upper mold and the lower mold for making the snowboard, apply epoxy resin on the carbon fiber layer to fully impregnate the carbon fiber layer, and then put the lightweight filling layer into the lower mold. S3. After closing the mold, perform film pressing. S4. Put the mold into the curing chamber for curing. S5. Take out the cured carbon fiber board from the mold, and perform cutting and trimming to ensure that the size and shape of the snowboard meet the requirements. S6. Perform surface treatment on the snowboard in step S4.

[0011] As another improvement of the manufacturing method of the present invention, in step S3, the film pressing temperature is 120 - 180 °C, and the pressing pressure is 1.0 - 2.0 kPa.

[0012] As another improvement of the manufacturing method of the present invention, in step S4, the curing temperature is 135 - 185 °C, and the curing time is 30 min - 2 h.

[0013] As another improvement of the manufacturing method of the present invention, in step S6, the surface treatment includes polishing and coating a protective layer.

[0014] In summary, the beneficial effects of the present invention compared with the prior art are as follows: First, in the present invention, carbon fiber is used as the outer shell, and lightweight materials are filled in the carbon fiber. While greatly reducing the overall mass, it effectively improves the overall structural strength and can meet the use requirements of the snowboard.

[0015] Second, in the present invention, the combination of methacrylic acid (MAA), methacrylonitrile (MAN), allyl methacrylate (AMA), wollastonite, tert-butyl perbenzoate (TBPB), and butyl acetate (BAC) in the lightweight filling layer in a suitable proportion is a multifunctional composite material system, and its synergistic effect can significantly improve the material properties. The specific advantages are as follows: 1. By adding an appropriate amount of wollastonite, ① it can effectively enhance the mechanical properties: As a natural acicular mineral filler, it can improve the rigidity, flexural strength and wear resistance of the material. ② It can effectively reduce the shrinkage rate: reduce the volume shrinkage during the curing process and improve the dimensional stability. ③ It can effectively improve the thermal stability: The high thermal conductivity of wollastonite can optimize the heat dissipation performance of the material.

[0016] 2. In the present invention, tert-butyl peroxybenzoate (TBPB) is used as a polymerization initiator: It can effectively provide free radicals to initiate the copolymerization reaction, promote the formation of a crosslinked network, and enhance the hardness and impact resistance of the material. In addition, the curing time can be optimized by controlling the dosage, and the reaction rate can be effectively regulated, which is suitable for processes such as molding and casting, making the processing more convenient.

[0017] 3. In the present invention, butyl acetate (BAC) is used as a solvent and diluent: It can effectively reduce the viscosity of the system, improve the processing fluidity, and facilitate coating or injection molding. In addition, it can effectively adjust the compatibility of each component: promote the uniform dispersion of monomers and fillers and avoid agglomeration.

[0018] 4. In the present invention, the reinforcing effect of wollastonite and the crosslinked structure of allyl methacrylate (AMA) are synergistic, enabling the material to have both high hardness and anti-deformation ability.

[0019] 5. In the present invention, the combination of a moderate crosslinking density and the toughening effect of wollastonite reduces the risk of brittle fracture and effectively improves the overall impact resistance.

[0020] 6. In the present invention, the nitrile group (-CN) of methacrylonitrile (MAN) and the high thermal conductivity of wollastonite together increase the heat distortion temperature of the material, which can withstand an environment above 120 °C.

[0021] 7. In the present invention, butyl acetate (BAC) reduces the viscosity of the system, improves the fluidity of the material, reduces the processing energy consumption, and is suitable for the molding of products of various shapes.

[0022] 8. In the present invention, the initiation efficiency of tert-butyl peroxybenzoate and the evaporation rate of butyl acetate (BAC) are coordinated to precisely control the curing time and surface finish.

[0023] 9. In the present invention, the nitrile group of methacrylonitrile (MAN) and the inert surface of wollastonite enhance the tolerance of the material to acids, alkalis and organic solvents.

[0024] III. In the present invention, a support skeleton is arranged inside the carbon fiber shell, greatly improving the overall strength.

[0025] IV. In the present invention, hollow slots with appropriate shapes are opened in the lightweight filling layer, effectively reducing material redundancy and overall weight. A support framework made of carbon fiber material is arranged in the hollow slots to form a mechanical support system, increasing the structural stiffness by 30 - 50% and achieving weight reduction while meeting the compressive strength requirements. Additionally, the groove design can guide the stress concentration area to transfer to the support framework, and the three-dimensional grid-like framework can disperse a single-point load into a surface load (stress reduction of 40 - 60%), greatly improving the impact resistance of the product. Through reasonable structural design, the material utilization efficiency can be increased by more than 40% while ensuring the functions, providing an innovative solution for product lightweighting.

[0026] V. The hollow slots and the support framework form a damping system, increasing the vibration attenuation rate by 40%. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a three-dimensional schematic diagram of the present invention.

[0028] Figure 2 is one of the cross-sectional schematic diagrams of the present invention.

[0029] Figure 3 is the second cross-sectional schematic diagram of the present invention.

[0030] Figure 4 is the first implementation manner of the hollow slots of the present invention.

[0031] Figure 5 is the second implementation manner of the hollow slots of the present invention.

[0032] Figure 6 is the third implementation manner of the hollow slots of the present invention.

[0033] Figure 7 is the fourth implementation manner of the hollow slots of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0034] The following further describes in detail the above and other technical features and advantages of the present invention with reference to the accompanying drawings.

[0035] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and do not limit the protection scope of the present invention.

[0036] It should be noted that in the description of the present invention, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the direction or positional relationship shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0037] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] Embodiment 1 As Figure 1-3 shown, a snowboard includes a waist portion 1, an upturned nose 2 located at the head of the waist portion 1, and an upturned tail 3 located at the tail of the waist portion 1. The upturned nose 2 and the upturned tail 3 of the waist portion 1 are both made of carbon fiber material; a cavity 4 is provided inside the waist portion 1, and a lightweight filling layer 5 is filled inside the cavity 4.

[0039] Wherein, a support skeleton 6 is provided inside the cavity 4. The support skeleton 6 and the inner wall of the waist portion 1 are integrally formed. The lightweight filling layer 5 is a polymethacrylimide layer.

[0040] Embodiment 2 This embodiment is based on Embodiment 1. Additionally, a number of hollow slots 7 are provided at intervals or continuously on the lightweight filling layer 5, and the support skeleton 6 is arranged inside the hollow slots 7.

[0041] The first implementation manner of the hollow slot 7 of the present invention is shown in Figure 4 , wherein a plurality of hollow slots 7 are provided at intervals on the lightweight filling layer 5. The hollow slots 7 include four waist-shaped holes, and the diagonal waist-shaped holes are connected and communicated through connecting through slots.

[0042] The second implementation manner of the hollow slot 7 of the present invention is shown in Figure 5 , wherein the hollow slots 7 are continuously provided on the lightweight filling layer 5, and the hollow slots 7 are wavy long slot holes.

[0043] The third implementation manner of the hollow slot 7 of the present invention is shown in Figure 6 , wherein the hollow slots 7 include a number of hexagonal slot holes, and adjacent two hexagonal slot holes are connected and communicated with each other through connecting through slots.

[0044] The fourth embodiment of the hollow slot 7 of the present invention is shown in Figure 7 , wherein the hollow slot 7 is a serrated long slot.

[0045] Example 3 The method for manufacturing the snowboard of the present invention includes the following steps: S1. Prepare polymethacrylimide foam: S11. Mix 30 parts by weight of methacrylic acid, 40 parts by weight of methacrylonitrile, 0.2 part by weight of allyl methacrylate, 0.01 part by weight of wollastonite, 0.1 part by weight of tert-butyl perbenzoate, and 1.2 parts by weight of butyl acetate to obtain mixture A; S12. Heat the liquid mixture A to 75 °C and react for 2 h to obtain solid mixture B; S13. Heat the mold to 120 °C, add the solid mixture B obtained in step S12, close the mold and keep it warm for reaction for 3 h, then heat the foam molding mold to 160 °C, react for 10 h, and cool to room temperature to obtain the polymethacrylimide foam; S2. Lay a layer of carbon fiber layer in each of the upper mold and the lower mold for manufacturing the snowboard, apply epoxy resin on the carbon fiber layer to fully impregnate the carbon fiber layer, and then place the lightweight filling layer into the lower mold; S3. After closing the mold, perform film pressing; wherein, the film pressing temperature is 120 °C and the pressing pressure is 1.0 kPa.

[0046] S4. Place the mold in a curing chamber for curing; wherein the curing temperature is 135 °C and the curing time is 30 min.

[0047] S5. Take out the cured carbon fiber board from the mold, cut and trim it to ensure that the size and shape of the snowboard meet the requirements; S6. Polish and coat a protective layer on the snowboard in step S4.

[0048] Example 4 The method for manufacturing the snowboard of the present invention includes the following steps: S1. Prepare polymethacrylimide foam: S11. Mix 70 parts by weight of methacrylic acid, 50 parts by weight of methacrylonitrile, 0.6 part by weight of allyl methacrylate, 0.05 part by weight of wollastonite, 0.12 part by weight of tert-butyl perbenzoate, and 1.8 parts by weight of butyl acetate to obtain mixture A; S12. Heat the liquid mixture A to 85 °C and react for 8 h to obtain solid mixture B; S13. Heat the mold to 140 °C, add the solid mixture B obtained in step S12, close the mold and keep it warm for reaction for 3 - 5 h, then heat the foam molding mold to 180 °C, react for 20 h, and cool to room temperature to obtain the polymethacrylimide foam; S2. Lay a layer of carbon fiber layer in each of the upper mold and the lower mold for making the snowboard, apply epoxy resin on the carbon fiber layer to fully impregnate the carbon fiber layer, and then put the lightweight filling layer into the lower mold; S3. After closing the mold, carry out film pressing; wherein, the film pressing temperature is 180 °C and the pressing pressure is 2.0 kPa.

[0049] S4. Put the mold into the curing chamber for curing; wherein the curing temperature is 185 °C and the curing time is 2 h.

[0050] S5. Take out the cured carbon fiber board from the mold, cut and trim it to ensure that the size and shape of the snowboard meet the requirements; S6. Polish and coat a protective layer on the snowboard in step S4.

[0051] Example 5 The method for manufacturing the snowboard of the present invention includes the following steps: S1. Manufacture polymethacrylimide foam: S11. Mix 50 parts by weight of methacrylic acid, 45 parts by weight of methacrylonitrile, 0.4 part by weight of allyl methacrylate, 0.03 part by weight of wollastonite, 0.11 part by weight of tert-butyl perbenzoate, and 1.5 parts by weight of butyl acetate to obtain mixture A; S12. Heat the liquid mixture A to 80 °C and react for 6 h to obtain solid mixture B; S13. Heat the mold to 130 °C, add the solid mixture B obtained in step S12, close the mold and keep it warm for reaction for 3 - 5 h, then heat the foam molding mold to 170 °C, react for 15 h, and cool to room temperature to obtain the polymethacrylimide foam; S2. Lay a layer of carbon fiber layer in each of the upper mold and the lower mold for making the snowboard, apply epoxy resin on the carbon fiber layer to fully impregnate the carbon fiber layer, and then put the lightweight filling layer into the lower mold; S3. After closing the mold, carry out film pressing; wherein, the film pressing temperature is 150 °C and the pressing pressure is 1.5 kPa.

[0052] S4. Put the mold into the curing chamber for curing; wherein the curing temperature is 150 °C and the curing time is 1 h.

[0053] S5. Take out the cured carbon fiber board from the mold, cut and trim it to ensure that the size and shape of the snowboard meet the requirements; S6. Polish and coat a protective layer on the ski board in step S4.

[0054] Comparative Example 1 A polymethacrylimide foam is prepared from the following raw materials in parts by weight: 60 parts of methacrylic acid, 30 parts of methacrylonitrile, 9 parts of dimethyl adipate, 1 part of benzoyl peroxide.

[0055] The preparation method of the polymethacrylimide foam comprises the following steps: (1) Weigh methacrylic acid, methacrylonitrile, dimethyl adipate and benzoyl peroxide, and mix them at 20°C for 2 h, to obtain a liquid mixture A; (2) Heat the liquid mixture A at a heating rate to 75°C and react for 6 h to obtain a solid mixture B; (3) Heat the mold to 130°C, add the solid mixture B obtained in step (2), close the mold and keep it warm for reaction for 4 h, then heat the mold to 170°C and react for 15 h, and cool to room temperature to obtain the polymethacrylimide foam.

[0056] Perform performance tests on the polymethacrylimide foams obtained in Examples 3-5 and Comparative Example 1, and the results are shown in Table 1.

[0057] Table 1 Performance test results Test items Example 3 Example 4 Example 5 Comparative example 1 Density (kg / m³) 26 24 22 40 Tensile strength (MPa) 4.5 4.6 5.3 0.2 Compressive strength (MPa) 4.2 3.9 4.8 0.3 Flexural strength (MPa) 3.6 3.8 4.3 0.4 Shear strength (MPa) 2.3 2.5 3.1 0.2 Elastic modulus (MPa) 108 112 125 19 Flexural modulus (MPa) 45 48 52 8 Shear modulus (MPa) 45 49 55 5 Elongation at break (%) 8.2 8.8 9.6 1.3 Thermal dimensional stability (℃) 180 176 183 120 Thermal conductivity (w / m.K) 0.031 0.026 0.022 0.06 It can be seen from the results in Table 1 that the raw materials of the polymethacrylimide foam provided in Comparative Example 1 do not include allyl methacrylate, wollastonite, tert-butyl peroxybenzoate, and butyl acetate, resulting in a significant reduction in the mechanical properties of the finally obtained polymethacrylimide foam, and the heat resistance, heat insulation performance, and flame retardancy are also far inferior to those of the polymethacrylimide foam obtained in the examples of the present invention.

[0058] The polymethacrylimide foams provided in Examples 3-5 of the present invention have good mechanical properties, thermal stability, heat insulation performance, and flame retardancy.

[0059] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A snowboard, characterized in that: The invention comprises a board waist (1), an upturned board head (2) located at the head of the board waist (1), and an upturned board tail (3) located at the tail of the board waist (1), wherein the upturned board head (2) and the upturned board tail (3) of the board waist (1) are both made of carbon fiber material; a cavity (4) is arranged in the board waist (1), and a lightweight filling layer (5) is filled in the cavity (4).

2. A snowboard according to claim 1, characterized in that: A supporting frame (6) is arranged in the cavity (4).

3. A snowboard according to claim 2, characterized in that: The support frame (6) and the inner wall of the plate waist (1) are integrally formed.

4. A snowboard according to claim 2, characterized in that: A plurality of hollow slots (7) are arranged at intervals or continuously on the light filling layer (5), and the support frame (6) is arranged in the hollow slots (7).

5. A snowboard according to claim 1, characterized in that: The lightweight filling layer (5) is a polymethacrylimide layer.

6. A method for manufacturing a snowboard according to any one of claims 1 to 4, characterized in that The following steps are involved: S1. Preparation of polymethacrylimide foam: S11, 30-70 parts by weight of methacrylic acid, 40-50 parts by weight of methacrylonitrile, 0.2-0.6 parts by weight of allyl methacrylate, 0.01-0.05 parts by weight of wollastonite, 0.1-0.12 parts by weight of tert-butyl perbenzoate, and 1.2-1.8 parts by weight of butyl acetate are mixed to obtain a mixture A; S12, heating the liquid mixture A to 75-85° C. and reacting for 2-8 hours to obtain a solid mixture B; S13, heating the mold to 120-140° C., adding the solid mixture B obtained in step S12, closing the mold and keeping the mixture warm for 3-5 hours, then heating the foam forming mold to 160-180° C., reacting for 10-20 hours, and cooling to room temperature to obtain the polymethacrylimide foam; S2, laying a carbon fiber layer in the upper mold and the lower mold for making the snowboard, and applying epoxy resin on the carbon fiber layer to make the carbon fiber layer fully saturated, and then placing the lightweight filling layer (5) into the lower mold; S3, after mold closing, film pressing is performed; S4, placing the mold into a curing chamber for curing; S5. The cured carbon fiber plate is taken out from the mold, cut and trimmed to ensure that the size and shape of the ski board meet the requirements; S6. Performing surface treatment on the snowboard in step S4.

7. The manufacturing method according to claim 6, characterized in that: In step S3, the film pressing temperature is 120-180° C., and the pressing pressure is 1.0-2.0 kPa.

8. The manufacturing method according to claim 6, characterized in that: The curing temperature in step S4 is 135-185° C., and the curing time is 30 min-2 h.

9. The manufacturing method according to claim 6, characterized in that: The surface treatment in step S6 includes polishing and coating a protective layer.

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