Bat based on silicone shock absorption, and manufacturing method therefor

Abstract

A bat based on silicone shock absorption, relating to the technical field of sports equipment manufacturing. The bat comprises a grip handle (1), a silicone sleeve (3), and a ball hitting barrel (2) provided with an opening at the lower end. The upper end of the grip handle (1) is provided with a connecting section, the silicone sleeve (3) is sleeved on the connecting section of the grip handle (1), the connecting section is bonded to the inner side of the silicone sleeve (3) by means of a first bonding layer, and the lower end of the inner wall of the ball hitting barrel (2) is bonded to the outer side of the silicone sleeve (3) by means of a second bonding layer. The silicone sleeve (3) having a shock absorption effect and bonded by means of a silicone adhesive is provided between the grip handle (1) and the ball hitting barrel (2), so that the bat has an excellent shock absorption performance.

Description

A ball-shaped rod based on silicone damping and its preparation method

[0001] This application claims priority to Chinese Patent Application No. 202411668684.2, filed on November 21, 2024, entitled "A Baseball Bat Based on Silicone Shock Absorption and a Method for Preparing the Same", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of sports equipment manufacturing technology, and in particular to a baseball bat based on silicone shock absorption and its preparation method. Background Technology

[0003] Baseball and softball are popular ball sports that require the use of bats to hit the ball in offensive and defensive combat. However, when a player hits the ball, the impact force generated by the ball hitting the bat and being knocked away is transmitted along the bat to the hand holding the bat, causing great discomfort and even severe pain, which hinders the player's daily practice. To solve this problem, it is necessary to develop a bat with shock absorption capabilities.

[0004] Application content

[0005] Based on the technical problems existing in the background technology, this application proposes a ball bat based on silicone shock absorption and its preparation method.

[0006] This application proposes a baseball bat based on silicone shock absorption. The bat includes a grip handle, a silicone sleeve, and a batting cylinder with an opening at the lower end. The upper end of the grip handle has a connecting section, and the silicone sleeve is fitted onto the connecting section of the grip handle. The connecting section is bonded to the inner side of the silicone sleeve through a first adhesive layer, and the lower end of the inner wall of the batting cylinder is bonded to the outer side of the silicone sleeve through a second adhesive layer.

[0007] The silicone sleeve is made from the following raw materials in parts by weight: 100 parts methyl vinyl silicone rubber raw rubber, 30-40 parts fumed silica, 0.3-0.8 parts vulcanizing agent, 1-2 parts amino silicone oil, and 0.3-0.5 parts cashew phenol glycidyl ether.

[0008] The first adhesive layer and the second adhesive layer are formed by curing silicone adhesive. The silicone adhesive includes component A and component B. Component A includes the following raw materials in parts by weight: 100 parts of acrylate-modified silicone resin, 5-10 parts of methyl silicone oil, and 30-50 parts of inorganic filler. Component B includes the following raw materials in parts by weight: 10-20 parts of methyl silicone oil, 5-10 parts of silane coupling agent KH-550, 2-5 parts of tetraethyl orthosilicate, and 0.5-1 part of organotin catalyst. The mass ratio of component A to component B is 3-5:1.

[0009] The preparation method of the acrylate-modified organosilicon resin includes: adding α,ω-dihydroxy polydimethylsiloxane, acrylic acid, methyl methacrylate and hydroxyethyl methacrylate to a solvent, and then adding an initiator solution dropwise under nitrogen protection to carry out a polymerization reaction, thereby obtaining the product. The mass ratio of α,ω-dihydroxy polydimethylsiloxane, acrylic acid, methyl methacrylate, hydroxyethyl methacrylate and initiator is 1:0.2~0.3:1~1.5:0.8~1.2:0.03~0.05.

[0010] Preferably, the methyl vinyl silicone rubber raw rubber has a vinyl content of 0.1% to 0.3% and a molecular weight of 500,000 to 700,000.

[0011] Preferably, the vulcanizing agent is dicumyl peroxide or bis(2,5-diphenyl)sulfide.

[0012] In this application, cashew phenol glycidyl ether can be prepared using commercially available methods or conventional methods in the art, for example:

[0013] Cashew nut phenol, epichlorohydrin, and benzyltriethylammonium chloride are mixed evenly and then reacted at 70–90°C for 4–6 hours under nitrogen protection. The temperature is then lowered to 55–65°C, and a 30–40% sodium hydroxide solution is added. The reaction is continued for 3–4 hours, and after cooling, the mixture is washed with water until neutral. The organic phase is then separated, and water and epichlorohydrin are removed by rotary evaporation to obtain the final product. The mass ratio of cashew nut phenol, epichlorohydrin, benzyltriethylammonium chloride, and sodium hydroxide is 100:200–300:0.5–1:15–20.

[0014] Preferably, the preparation method of the silicone sleeve includes: adding methyl vinyl silicone rubber raw rubber and fumed silica to a kneader, mixing at 30-40°C for 10-20 minutes, then raising the temperature to 60-80°C, adding amino silicone oil and cashew phenol glycidyl ether, mixing for 20-30 minutes, then adding a vulcanizing agent, and continuing to mix for 5-10 minutes to obtain a mixed rubber compound; adding the mixed rubber compound to a mold, and vulcanizing at 140-160°C and 5-8 MPa for 5-10 minutes to obtain the final product.

[0015] Preferably, the inorganic filler is at least one of fumed silica, talc, calcium carbonate, and barium sulfate.

[0016] Preferably, the polymerization reaction is carried out at a temperature of 70–80°C for 2–4 hours.

[0017] Preferably, the material of the striking tube is aluminum alloy or carbon fiber.

[0018] Preferably, it also includes a retaining ring, and a threaded section connected to the connecting section is provided below the grip handle connecting section. The retaining ring is fixedly connected to the threaded section by the thread and is used to limit the end of the ball-hitting tube.

[0019] Preferably, the retaining ring has an internal thread that engages with the threaded section of the grip handle.

[0020] Preferably, the method for preparing the baseball bat includes the following steps:

[0021] Apply silicone adhesive evenly to the connecting section at the upper end of the handle, then put the silicone sleeve on the connecting section and let it cure to form the first adhesive layer; apply silicone adhesive evenly to the outside of the silicone sleeve, then put the lower end of the inner wall of the ball tube on the silicone sleeve and let it cure to form the second adhesive layer; then screw the retaining ring into the threaded section of the handle to complete the process.

[0022] The beneficial effects of this application are as follows:

[0023] The baseball bat of this application achieves excellent shock absorption performance by incorporating a shock-absorbing silicone sleeve between the grip handle and the bat barrel, bonded together with silicone adhesive. Specifically, appropriate amounts of amino silicone oil and cashew phenol glycidyl ether are added to the raw material of the silicone sleeve. During the preparation of the silicone rubber, these two components cross-link, introducing more active groups and flexible aliphatic long chains into the rubber compound. This improves the toughness and interfacial bonding of the rubber compound, strengthening the adhesion between the silicone sleeve, the bat barrel, and the adhesive layer formed by the silicone adhesive. A suitable acrylate monomer, acrylic acid, is used. Modifying the base material α,ω-dihydroxypolydimethylsiloxane of silicone adhesive with methyl methacrylate and hydroxyethyl methacrylate can improve the wetting ability and adhesion of the silicone adhesive to the silicone sleeve and the bat tube. As a result, the grip handle and the bat tube can be tightly bonded together through the adhesive layer formed by the silicone sleeve and silicone adhesive. The adhesion between the silicone sleeve and the adhesive layer, the handle, and the bat tube is very strong and is not easy to peel off under the vibration generated when the bat is hit, thus affecting the shock absorption effect and providing a long-term shock absorption effect. Attached Figure Description

[0024] Figure 1 is a schematic diagram of the baseball bat based on silicone shock absorption proposed in this application. In Figure 1, 1: grip handle, 2: batting cylinder, 3: silicone sleeve, 4: retaining ring. Detailed Implementation

[0025] The technical solution of this application will now be described in detail through specific embodiments.

[0026] In the following examples and comparative examples, the vinyl content of the methyl vinyl silicone rubber raw rubber is 0.23%, and the molecular weight is 600,000.

[0027] Example 1

[0028] A baseball bat based on silicone shock absorption includes a handle 1, a silicone sleeve 3, a retaining ring 4, and an aluminum alloy batting cylinder 2 with an opening at the lower end. The upper end of the handle 1 has a connecting section, the silicone sleeve 3 is fitted onto the connecting section of the handle, and the connecting section is bonded to the inner side of the silicone sleeve 3 via a first adhesive layer. The lower end of the inner wall of the batting cylinder 2 is bonded to the outer side of the silicone sleeve 3 via a second adhesive layer. Below the connecting section of the handle 1 is a threaded section connected to the connecting section. The retaining ring 4 has an internal thread and engages with the threaded section of the handle 1, being threadedly fixed to the threaded section and used to limit the end of the batting cylinder 2.

[0029] The silicone sleeve 3 is made from the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber raw rubber, 35 parts of fumed silica, 0.5 parts of bis(2,5-dimethyl)sulfide, 1.5 parts of amino silicone oil, and 0.4 parts of cashew phenol glycidyl ether. The preparation method of the silicone sleeve 3 includes: adding methyl vinyl silicone rubber raw rubber and fumed silica to a kneader, mixing at 35°C for 15 minutes, then raising the temperature to 70°C, adding amino silicone oil and cashew phenol glycidyl ether, mixing for 25 minutes, then adding bis(2,5-dimethyl)sulfide and continuing to mix for 8 minutes to obtain a mixed rubber compound; adding the mixed rubber compound to a mold, and vulcanizing at 155°C and 7MPa for 6 minutes to obtain the final product.

[0030] The preparation method of cashew phenol glycidyl ether is as follows: cashew phenol, epichlorohydrin and benzyltriethylammonium chloride are mixed evenly, and then the mixture is kept at 80°C for 5 hours under nitrogen protection. The temperature is then lowered to 60°C, and a 30% sodium hydroxide solution is added. The mixture is kept at 3 hours and then cooled and washed with water until neutral. The organic phase is then separated, and water and epichlorohydrin in the organic phase are removed by rotary evaporation to obtain the product. The mass ratio of cashew phenol, epichlorohydrin, benzyltriethylammonium chloride and sodium hydroxide is 100:200:0.5:15.

[0031] The first and second adhesive layers are formed by curing silicone adhesive. The silicone adhesive includes component A and component B. Component A includes the following raw materials in parts by weight: 100 parts of acrylate-modified silicone resin, 8 parts of methyl silicone oil, and 40 parts of fumed silica. Component B includes the following raw materials in parts by weight: 15 parts of methyl silicone oil, 8 parts of silane coupling agent KH-550, 3 parts of tetraethyl orthosilicate, and 0.8 parts of dibutyltin dilaurate. The mass ratio of component A to component B is 4:1.

[0032] The preparation method of acrylate-modified organosilicon resin includes: adding α,ω-dihydroxy polydimethylsiloxane, acrylic acid, methyl methacrylate and hydroxyethyl methacrylate to ethyl acetate, then adding an ethyl acetate solution of azobisisobutyronitrile dropwise under nitrogen protection, and carrying out a polymerization reaction at 75°C for 3 hours to obtain the product. The mass ratio of α,ω-dihydroxy polydimethylsiloxane, acrylic acid, methyl methacrylate, hydroxyethyl methacrylate and azobisisobutyronitrile is 1:0.25:1.25:1:0.04.

[0033] The above-mentioned method for preparing baseball bats includes the following steps:

[0034] Apply silicone adhesive evenly to the connecting section at the upper end of the handle 1, then put the silicone sleeve 3 on the connecting section and cure it at room temperature for 12 hours to form the first adhesive layer; apply silicone adhesive evenly to the outside of the silicone sleeve 3, then put the lower end of the inner wall of the aluminum alloy ball tube 2 on the silicone sleeve 3 and cure it at room temperature for 12 hours to form the second adhesive layer; then screw the fixing ring 4 into the threaded section of the handle 1 to complete the process.

[0035] Example 2

[0036] The only difference between Example 2 and Example 1 is that the silicone sleeve 3 is different.

[0037] The silicone sleeve 3 of Example 2 is made from the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber raw rubber, 30 parts of fumed silica, 0.3 parts of bis(2,5-dimethyl)sulfide, 1 part of amino silicone oil, and 0.3 parts of cashew phenol glycidyl ether. The preparation method of silicone sleeve 3 includes: adding methyl vinyl silicone rubber raw rubber and fumed silica to a kneader, mixing at 35°C for 15 min, then raising the temperature to 70°C, adding amino silicone oil and cashew phenol glycidyl ether, mixing for 25 min, then adding bis(2,5-dimethyl)sulfide, and continuing to mix for 8 min to obtain a mixed rubber compound; adding the mixed rubber compound to a mold, and vulcanizing at 155°C and 7 MPa for 6 min to obtain the final product.

[0038] Example 3

[0039] The only difference between Example 3 and Example 1 is the silicone adhesive.

[0040] The silicone adhesive of Example 3 includes component A and component B. Component A includes the following raw materials in parts by weight: 100 parts of acrylate-modified silicone resin, 5 parts of methyl silicone oil, and 30 parts of fumed silica. Component B includes the following raw materials in parts by weight: 10 parts of methyl silicone oil, 5 parts of silane coupling agent KH-550, 2 parts of tetraethyl orthosilicate, and 0.5 parts of dibutyltin dilaurate. The mass ratio of component A to component B is 3:1.

[0041] The preparation method of the acrylate-modified organosilicon resin includes: adding α,ω-dihydroxypolydimethylsiloxane, acrylic acid, methyl methacrylate and hydroxyethyl methacrylate to ethyl acetate, then adding an ethyl acetate solution of azobisisobutyronitrile dropwise under nitrogen protection, and carrying out a polymerization reaction at 75°C for 3 hours to obtain the product, wherein the mass ratio of α,ω-dihydroxypolydimethylsiloxane, acrylic acid, methyl methacrylate, hydroxyethyl methacrylate and azobisisobutyronitrile is 1:0.2:1:0.8:0.03.

[0042] Comparative Example 1

[0043] The only difference between Comparative Example 1 and Example 1 is that the silicone sleeve 3 is different.

[0044] The silicone sleeve 3 of Comparative Example 1 was made from the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber raw rubber, 35 parts of fumed silica, and 0.5 parts of bis(2,5-dimethyl)sulfurizing agent. The preparation method of the silicone sleeve 3 included: adding methyl vinyl silicone rubber raw rubber and fumed silica to a kneader, mixing at 35°C for 15 min, then raising the temperature to 70°C and continuing to mix for 25 min, then adding the bis(2,5-dimethyl)sulfurizing agent and continuing to mix for 8 min to obtain a mixed rubber compound; adding the mixed rubber compound to a mold and vulcanizing at 155°C and 7 MPa for 6 min to obtain the final product.

[0045] Comparative Example 2

[0046] The only difference between Comparative Example 2 and Example 1 is the silicone adhesive used.

[0047] The silicone adhesive of Comparative Example 2 includes component A and component B. Component A includes the following raw materials in parts by weight: 100 parts of silicone resin, 8 parts of methyl silicone oil, and 40 parts of fumed silica. Component B includes the following raw materials in parts by weight: 15 parts of methyl silicone oil, 8 parts of silane coupling agent KH-550, 3 parts of tetraethyl orthosilicate, and 0.8 parts of dibutyltin dilaurate. The mass ratio of component A to component B is 4:1. The silicone resin is α,ω-dihydroxypolydimethylsiloxane.

[0048] Test case

[0049] Professional softball players practiced hitting the ball 1500 times each using bats from Example 1 and Comparative Examples 1-2 for 30 days, hitting 50 times per day. After completing the 1500 hitting sessions, a sensory evaluation test was conducted on the bats' shock absorption. The test method involved hitting the ball 20 times with the bat and evaluating whether the player felt any discomfort in their hand. The evaluation results showed that the bat from Example 1 maintained excellent shock absorption performance after 1500 hitting sessions, and players did not experience any hand discomfort after hitting the ball 20 times with it. However, the bats from Comparative Examples 1-2 showed decreased shock absorption after 1500 hitting sessions, and players experienced significant hand discomfort after hitting the ball 20 times with them. This is because the silicone sleeve formula of Comparative Example 1 does not contain amino silicone oil and cashew phenol glycidyl ether, resulting in insufficient toughness and interfacial bonding strength. After long-term practice, the silicone sleeve is affected by the vibration during the hitting, causing a certain degree of peeling from the adhesive layer, which affects the shock absorption effect. On the other hand, the silicone glue of Comparative Example 2 is not modified with acrylate, and its adhesion and wettability are insufficient. It also peels off after long-term hitting due to vibration, resulting in a decrease in shock absorption effect.

[0050] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and application concept of this application, should be included within the scope of protection of this application.

Claims

1. A baseball bat based on silicone shock absorption, characterized in that, The bat includes a grip handle, a silicone sleeve, and a batting cylinder with an opening at the lower end; the upper end of the grip handle has a connecting section, the silicone sleeve is fitted onto the connecting section of the grip handle, and the connecting section is bonded to the inner side of the silicone sleeve through a first adhesive layer, and the lower end of the inner wall of the batting cylinder is bonded to the outer side of the silicone sleeve through a second adhesive layer. The silicone sleeve is made from the following raw materials in parts by weight: 100 parts methyl vinyl silicone rubber raw rubber, 30-40 parts fumed silica, 0.3-0.8 parts vulcanizing agent, 1-2 parts amino silicone oil, and 0.3-0.5 parts cashew phenol glycidyl ether. The first adhesive layer and the second adhesive layer are formed by curing silicone adhesive. The silicone adhesive includes component A and component B. Component A includes the following raw materials in parts by weight: 100 parts of acrylate-modified silicone resin, 5-10 parts of methyl silicone oil, and 30-50 parts of inorganic filler. Component B includes the following raw materials in parts by weight: 10-20 parts of methyl silicone oil, 5-10 parts of silane coupling agent KH-550, 2-5 parts of tetraethyl orthosilicate, and 0.5-1 part of organotin catalyst. The mass ratio of component A to component B is 3-5:

1. The preparation method of the acrylate-modified organosilicon resin includes: adding α,ω-dihydroxy polydimethylsiloxane, acrylic acid, methyl methacrylate and hydroxyethyl methacrylate to a solvent, and then adding an initiator solution dropwise under nitrogen protection to carry out a polymerization reaction, thereby obtaining the product. The mass ratio of α,ω-dihydroxy polydimethylsiloxane, acrylic acid, methyl methacrylate, hydroxyethyl methacrylate and initiator is 1:0.2~0.3:1~1.5:0.8~1.2:0.03~0.

05.

2. The baseball bat based on silicone shock absorption according to claim 1, characterized in that, The methyl vinyl silicone rubber raw rubber has a vinyl content of 0.1% to 0.3% and a molecular weight of 500,000 to 700,000.

3. The baseball bat based on silicone shock absorption according to claim 1, characterized in that, The vulcanizing agent is dicumyl peroxide or bis(2,5-diphenyl) peroxide.

4. The baseball bat based on silicone shock absorption according to claim 1, characterized in that, The preparation method of the silicone sleeve includes: adding methyl vinyl silicone rubber raw rubber and fumed silica to a kneader, mixing at 30-40°C for 10-20 minutes, then raising the temperature to 60-80°C, adding amino silicone oil and cashew phenol glycidyl ether, mixing for 20-30 minutes, then adding a vulcanizing agent, and continuing to mix for 5-10 minutes to obtain a mixed rubber compound; adding the mixed rubber compound to a mold, and vulcanizing at 140-160°C and 5-8 MPa for 5-10 minutes to obtain the final product.

5. The baseball bat based on silicone shock absorption according to claim 1, characterized in that, The inorganic filler is at least one of fumed silica, talc, calcium carbonate, and barium sulfate.

6. The baseball bat based on silicone shock absorption according to claim 1, characterized in that, The polymerization reaction is carried out at a temperature of 70–80°C for 2–4 hours.

7. The baseball bat based on silicone shock absorption according to claim 1, characterized in that, The striking tube is made of aluminum alloy or carbon fiber.

8. The baseball bat based on silicone shock absorption according to claim 1, characterized in that, It also includes a retaining ring. The lower part of the grip handle connecting section is provided with a threaded section connected to the connecting section. The retaining ring is fixedly connected to the threaded section by the thread and is used to limit the end of the ball-hitting tube.

9. The baseball bat based on silicone shock absorption according to claim 8, characterized in that, The retaining ring has an internal thread that engages with the threaded section of the grip handle.

10. The baseball bat based on silicone shock absorption according to claim 8, characterized in that, The method for preparing the bat includes the following steps: Apply silicone adhesive evenly to the connecting section at the upper end of the handle, then put the silicone sleeve on the connecting section and let it cure to form the first adhesive layer; apply silicone adhesive evenly to the outside of the silicone sleeve, then put the lower end of the inner wall of the ball tube on the silicone sleeve and let it cure to form the second adhesive layer; then screw the retaining ring into the threaded section of the handle to complete the process.

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