Light baseball bat and preparation method thereof

Abstract

The invention provides a light baseball bat and a preparation method thereof, and relates to the technical field of baseball bat. A light baseball bat comprises a fiber layer, a BOPP (biaxially-oriented polypropylene) isolating layer and a composite material layer. And the fiber layer comprises carbon fibers, glass fibers and epoxy resin. The composite material layer comprises carbon fibers, modified polyimide fibers, a resin material and diethylene diamine. The light baseball bat provided by the invention has excellent mechanical properties.

Description

Technical Field

[0001] The invention relates to the technical field of baseball bats, and in particular to a lightweight baseball bat and a preparation method thereof. Background Art

[0002] The density of carbon fiber materials is much lower than that of traditional materials such as wood or metal, which allows carbon fiber baseball bats to significantly reduce weight while maintaining strength. This is very important for athletes because lightweight bats can reduce the burden when swinging and improve hitting speed and accuracy. Therefore, the development of a lightweight baseball bat and its preparation method is of great significance for the widespread application of baseball bats. Summary of the invention

[0003] Based on the technical problems existing in the background technology, the present invention proposes a lightweight baseball bat and a preparation method thereof.

[0004] The invention provides a lightweight baseball bat, which comprises a fiber layer, a BOPP isolation layer and a composite material layer.

[0005] Preferably, the fiber layer comprises carbon fiber, glass fiber and epoxy resin.

[0006] More preferably, the mass ratio of the carbon fiber to the glass fiber is 1:(0.1-1).

[0007] Preferably, the BOPP isolation layer functions to isolate and delaminate.

[0008] Preferably, the composite material layer comprises carbon fiber, modified polyimide fiber, resin material and diethylenediamine.

[0009] More preferably, the preparation of the resin material comprises the following steps: ultrasonically dispersing carbon nanotubes in an ethanol solution, heating to reflux, filtering and drying to obtain pretreated carbon nanotubes, dispersing the pretreated carbon nanotubes in a toluene solution, adding γ-aminopropyltriethoxysilane, heating and stirring, washing, and vacuum drying to obtain modified carbon nanotubes; and ultrasonically dispersing the modified carbon nanotubes in bisphenol A epoxy resin.

[0010] More preferably, the mass ratio of the carbon nanotubes to the ethanol solution is (0.5-2):100.

[0011] More preferably, the mass ratio of the pretreated carbon nanotubes, toluene solution, and γ-aminopropyltriethoxysilane is (0.5-2):100:(5-15).

[0012] More preferably, the heating temperature is 60-80°C.

[0013] More preferably, the preparation of the modified polyimide fiber comprises: uniformly mixing graphene, carbon fiber powder, nano-silica, and a silane coupling agent to obtain a mixed solution, immersing the polyimide fiber in the mixed solution, and drying to obtain the modified polyimide fiber.

[0014] More preferably, the soaking and drying of the polyimide is regarded as a cycle and repeated for multiple times.

[0015] More preferably, the mass ratio of the graphene, carbon fiber powder, nano-silicon dioxide and silane coupling agent is (1-3):(10-15):(1-3):100.

[0016] More preferably, the silane coupling agent is 3-(2,3-epoxypropoxy)propyltrimethoxysilane; the mass fraction of the silane coupling agent is 1-10wt%.

[0017] The present invention also provides a method for preparing a lightweight baseball bat, comprising the following steps:

[0018] S1, impregnating a mixture of carbon fiber and glass fiber with epoxy resin, and wrapping the mixture on a core mold to obtain a fiber layer;

[0019] S2, wrapping BOPP on the fiber layer to obtain a BOPP isolation layer;

[0020] S3. Wrap the modified polyimide fiber on the BOPP isolation layer, add diethylenediamine to the resin material, mix evenly and apply it on the surface of the modified polyimide fiber, then lay the carbon fiber on the surface of the resin material to obtain a composite material layer; put it into a mold, inflate and pressurize the core mold, and pressurize the mold, take out the core mold to obtain a lightweight baseball bat.

[0021] Preferably, in S3, the mold pressurization process includes treating at room temperature and 5-8 MPa for 5-10 min, and then treating at 140-150° C. and 10-12 MPa for 35-45 min.

[0022] Preferably, in the above S3, the mold pressurization process also includes a pressure release heating treatment: a treatment at 140-150° C. for 35-45 minutes.

[0023] Preferably, in S3, the mass ratio of the resin material to diethylenediamine is 100:(10-15).

[0024] The beneficial effects of the present invention are:

[0025] The present invention provides a lightweight baseball bat, comprising a fiber layer, a BOPP isolation layer, and a composite material layer. The lightweight baseball bat prepared by the synergistic effect of raw materials and processes has high strength performance. The present invention cleverly combines carbon fiber, modified polyimide fiber, and resin material by regulating the raw materials and their ratios in the composite material layer, and tightly combines the raw materials through bidirectional pressurization to increase the strength of the material. During the preparation process of the present invention, a pressure-releasing heat treatment is performed to completely solidify the bat, and the continuous pressurization during the heating process can be prevented from adversely affecting the appearance of the bat. The modified polyimide fiber of the present invention helps to improve the overall mechanical properties of the material by adding different auxiliary materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A cross-sectional view of the anti-crack baseball bat proposed by the present invention;

[0027] 1-fiber layer, 2-BOPP isolation layer, 3-composite material layer. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is described in detail through specific embodiments.

[0029] Unless otherwise specified, the materials and reagents used in the following examples can be obtained from commercial sources.

[0030] Example 1

[0031] A lightweight baseball bat comprises a fiber layer, a BOPP isolation layer and a composite material layer.

[0032] The fiber layer comprises carbon fiber, glass fiber and epoxy resin; the mass ratio of the carbon fiber to the glass fiber is 1:0.5.

[0033] The composite material layer comprises carbon fiber, modified polyimide fiber, resin material and diethylenediamine.

[0034] The preparation of the resin material includes the following steps: ultrasonically dispersing carbon nanotubes in an ethanol solution, heating and refluxing, filtering and drying to obtain pretreated carbon nanotubes, dispersing the pretreated carbon nanotubes in a toluene solution, adding γ-aminopropyltriethoxysilane, heating and stirring at 65°C, washing, and vacuum drying to obtain modified carbon nanotubes; ultrasonically dispersing the modified carbon nanotubes in bisphenol A epoxy resin to obtain the obtained carbon nanotubes. The mass ratio of carbon nanotubes to ethanol solution is 1:100; the mass ratio of pretreated carbon nanotubes, toluene solution, and γ-aminopropyltriethoxysilane is 0.5:100:5.

[0035] The preparation of the modified polyimide fiber includes: mixing graphene, carbon fiber powder, nano-silica, and silane coupling agent uniformly to obtain a mixed solution, immersing the polyimide fiber in the mixed solution, drying, and circulating for 3 times to obtain the modified polyimide fiber. The silane coupling agent is 5wt% of 3-(2,3-epoxypropoxy)propyltrimethoxysilane; the mass ratio of graphene, carbon fiber powder, nano-silica, and silane coupling agent is 1:12:2:100.

[0036] A method for preparing a lightweight baseball bat comprises the following steps:

[0037] S1, impregnating a mixture of carbon fiber and glass fiber with epoxy resin, and wrapping the mixture on a core mold to obtain a fiber layer;

[0038] S2, wrapping BOPP on the fiber layer to obtain a BOPP isolation layer;

[0039] S3, wrap the modified polyimide fiber on the BOPP isolation layer, add diethylenediamine to the resin material, mix evenly, and then apply it on the surface of the modified polyimide fiber, and then lay the carbon fiber on the surface of the resin material to obtain a composite material layer; put it into a mold, inflate and pressurize the core mold, and pressurize it in the mold, treat it at room temperature and 8MPa for 8min, and then treat it at 140℃ and 10MPa for 45min; release the pressure and treat it at 150℃ for 35min; take out the core mold to obtain a lightweight baseball bat. The mass ratio of resin material and diethylenediamine is 100:12.

[0040] The tensile strength of the lightweight baseball bat prepared in this embodiment is 615 MPa.

[0041] Example 2

[0042] A lightweight baseball bat comprises a fiber layer, a BOPP isolation layer and a composite material layer.

[0043] The fiber layer comprises carbon fiber, glass fiber and epoxy resin; the mass ratio of the carbon fiber to the glass fiber is 1:1.

[0044] The composite material layer comprises carbon fiber, modified polyimide fiber, resin material and diethylenediamine.

[0045] The preparation of the resin material includes the following steps: ultrasonically dispersing carbon nanotubes in an ethanol solution, heating and refluxing, filtering and drying to obtain pretreated carbon nanotubes, dispersing the pretreated carbon nanotubes in a toluene solution, adding γ-aminopropyltriethoxysilane, heating and stirring at 65°C, washing, and vacuum drying to obtain modified carbon nanotubes; ultrasonically dispersing the modified carbon nanotubes in bisphenol A epoxy resin to obtain the obtained carbon nanotubes. The mass ratio of carbon nanotubes to ethanol solution is 1.5:100; the mass ratio of pretreated carbon nanotubes, toluene solution, and γ-aminopropyltriethoxysilane is 0.5:100:5.

[0046] The preparation of the modified polyimide fiber includes: mixing graphene, carbon fiber powder, nano-silica, and silane coupling agent uniformly to obtain a mixed solution, immersing the polyimide fiber in the mixed solution, drying, and circulating for 3 times to obtain the modified polyimide fiber. The silane coupling agent is 3wt% of 3-(2,3-epoxypropoxy)propyltrimethoxysilane; the mass ratio of graphene, carbon fiber powder, nano-silica, and silane coupling agent is 1:12:2:100.

[0047] A method for preparing a lightweight baseball bat comprises the following steps:

[0048] S1, impregnating a mixture of carbon fiber and glass fiber with epoxy resin, and wrapping the mixture on a core mold to obtain a fiber layer;

[0049] S2, wrapping BOPP on the fiber layer to obtain a BOPP isolation layer;

[0050] S3, wrap the modified polyimide fiber on the BOPP isolation layer, add diethylenediamine to the resin material, mix evenly, and then apply it on the surface of the modified polyimide fiber, and then lay the carbon fiber on the surface of the resin material to obtain a composite material layer; put it into a mold, inflate and pressurize the core mold, and pressurize it in the mold, treat it at room temperature and 8MPa for 10 minutes, and then treat it at 140℃ and 10MPa for 45 minutes; release the pressure and treat it at 145℃ for 40 minutes; take out the core mold to obtain a lightweight baseball bat. The mass ratio of resin material and diethylenediamine is 100:12.

[0051] The tensile strength of the lightweight baseball bat prepared in this embodiment is 590 MPa.

[0052] Example 3

[0053] A lightweight baseball bat comprises a fiber layer, a BOPP isolation layer and a composite material layer.

[0054] The fiber layer comprises carbon fiber, glass fiber and epoxy resin; the mass ratio of the carbon fiber to the glass fiber is 1:0.3.

[0055] The composite material layer comprises carbon fiber, modified polyimide fiber, resin material and diethylenediamine.

[0056] The preparation of the resin material includes the following steps: ultrasonically dispersing carbon nanotubes in an ethanol solution, heating and refluxing, filtering and drying to obtain pretreated carbon nanotubes, dispersing the pretreated carbon nanotubes in a toluene solution, adding γ-aminopropyltriethoxysilane, heating and stirring at 65°C, washing, and vacuum drying to obtain modified carbon nanotubes; ultrasonically dispersing the modified carbon nanotubes in bisphenol A epoxy resin to obtain the obtained carbon nanotubes. The mass ratio of carbon nanotubes to ethanol solution is 1:100; the mass ratio of pretreated carbon nanotubes, toluene solution, and γ-aminopropyltriethoxysilane is 1:100:10.

[0057] The preparation of the modified polyimide fiber includes: mixing graphene, carbon fiber powder, nano-silica, and silane coupling agent uniformly to obtain a mixed solution, immersing the polyimide fiber in the mixed solution, drying, and circulating for 3 times to obtain the modified polyimide fiber. The silane coupling agent is 5wt% of 3-(2,3-epoxypropoxy)propyltrimethoxysilane; the mass ratio of graphene, carbon fiber powder, nano-silica, and silane coupling agent is 1:12:3:100.

[0058] A method for preparing a lightweight baseball bat comprises the following steps:

[0059] S1, impregnating a mixture of carbon fiber and glass fiber with epoxy resin, and wrapping the mixture on a core mold to obtain a fiber layer;

[0060] S2, wrapping BOPP on the fiber layer to obtain a BOPP isolation layer;

[0061] S3, wrap the modified polyimide fiber on the BOPP isolation layer, add diethylenediamine to the resin material, mix evenly, and then apply it on the surface of the modified polyimide fiber, and then lay the carbon fiber on the surface of the resin material to obtain a composite material layer; put it into a mold, inflate and pressurize the core mold, and pressurize it in the mold, treat it at room temperature and 8MPa for 10 minutes, and then treat it at 140℃ and 10MPa for 45 minutes; release the pressure and treat it at 140℃ for 35 minutes; take out the core mold to obtain a lightweight baseball bat. The mass ratio of resin material and diethylenediamine is 100:12.

[0062] The tensile strength of the lightweight baseball bat prepared in this embodiment is 630 MPa.

[0063] In summary, the lightweight baseball bat provided by the present invention has excellent mechanical properties.

[0064] 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 lightweight baseball bat, characterized in that: It comprises a fiber layer, a BOPP isolation layer and a composite material layer; the composite material layer comprises carbon fiber, modified polyimide fiber, resin material and diethylenediamine.

2. The lightweight baseball bat according to claim 1, characterized in that: The preparation of the resin material comprises the following steps: ultrasonically dispersing carbon nanotubes in an ethanol solution, heating and refluxing, filtering and drying to obtain pretreated carbon nanotubes, dispersing the pretreated carbon nanotubes in a toluene solution, adding γ-aminopropyltriethoxysilane, heating and stirring, washing, and vacuum drying to obtain modified carbon nanotubes; and ultrasonically dispersing the modified carbon nanotubes in bisphenol A epoxy resin to obtain the obtained product.

3. The lightweight baseball bat according to claim 2, characterized in that: The mass ratio of the carbon nanotubes to the ethanol solution is (0.5-2):100; the mass ratio of the pretreated carbon nanotubes, the toluene solution, and γ-aminopropyltriethoxysilane is (0.5-2):100:(5-15).

4. The lightweight baseball bat according to claim 1, characterized in that: The preparation of the modified polyimide fiber comprises: mixing graphene, carbon fiber powder, nano silicon dioxide and a silane coupling agent uniformly to obtain a mixed solution, soaking the polyimide fiber in the mixed solution, and drying to obtain the modified polyimide fiber.

5. The lightweight baseball bat according to claim 4, characterized in that: The mass ratio of the graphene, carbon fiber powder, nano-silicon dioxide and silane coupling agent is (1-3):(10-15):(1-3):

100.

6. The lightweight baseball bat according to claim 1, characterized in that: The fiber layer comprises carbon fiber, glass fiber and epoxy resin.

7. A method for preparing a lightweight baseball bat according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, impregnating a mixture of carbon fiber and glass fiber with epoxy resin, and wrapping the mixture on a core mold to obtain a fiber layer; S2, wrapping BOPP on the fiber layer to obtain a BOPP isolation layer; S3. Wrap the modified polyimide fiber on the BOPP isolation layer, add diethylenediamine to the resin material, mix evenly and apply it on the surface of the modified polyimide fiber, then lay the carbon fiber on the surface of the resin material to obtain a composite material layer; put it into a mold, inflate and pressurize the core mold, and pressurize the mold, take out the core mold to obtain a lightweight baseball bat.

8. The preparation method according to claim 7, characterized in that: In the above-mentioned S3, the mold pressurization process includes treating at room temperature and 5-8 MPa for 5-10 min, and then treating at 140-150° C. and 10-12 MPa for 35-45 min.

9. The preparation method according to claim 7, characterized in that: In the above S3, the mold pressurization process also includes a pressure release heating treatment: a treatment at 140-150° C. for 35-45 minutes.

10. The preparation method according to claim 7, characterized in that: In the S3, the mass ratio of the resin material to diethylenediamine is 100:(10-15).

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