Bat based on silica gel damping and preparation method thereof

Abstract

The invention discloses a baseball bat based on silica gel damping, and relates to the technical field of sports equipment manufacturing. The bat comprises a holding handle, a silicon rubber sleeve and a ball hitting cylinder with an opening in the lower end. A connecting section is arranged at the upper end of the holding handle, the connecting section of the holding handle is sleeved with the silica gel sleeve, the connecting section is bonded with the inner side of the silica gel sleeve through a first bonding layer, and the lower end of the inner wall of the ball hitting cylinder is bonded with the outer side of the silica gel sleeve through a second bonding layer. According to the baseball bat, the silica gel sleeve with the damping function is arranged between the holding handle and the ball hitting cylinder and bonded through the silica gel glue, and the excellent damping performance can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of sports equipment manufacturing, and in particular to a baseball bat based on silica gel shock absorption and a preparation method thereof. Background Art

[0002] Baseball and softball are popular ball sports that require the use of bats to play offense and defense. However, when a player hits the ball, the impact force generated by the ball hitting the bat shaft and being hit away will be transmitted along the bat shaft to the hand holding the bat, causing great discomfort to the player's hand, and even causing severe pain, making it inconvenient for the player's daily practice. In order to solve this problem, it is necessary to develop a bat with a shock-absorbing effect. Summary of the invention

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

[0004] The present invention provides a baseball bat based on silicone shock absorption, the baseball bat comprises a grip handle, a silicone sleeve and a batting barrel with an opening at the lower end; a connecting section is provided at the upper end of the grip handle, the silicone sleeve is arranged on the connecting section of the grip handle, and the connecting section is bonded to the inner side of the silicone sleeve through a first bonding layer, and the lower end of the inner wall of the batting barrel is bonded to the outer side of the silicone sleeve through a second bonding layer;

[0005] The silicone sleeve is made of the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 30-40 parts of fumed silica, 0.3-0.8 parts of a vulcanizing agent, 1-2 parts of amino silicone oil, and 0.3-0.5 parts of cardanol glycidyl ether;

[0006] The first adhesive layer and the second adhesive layer are formed by curing silicone glue, wherein the silicone glue comprises component A and component B, wherein component A comprises 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, and component B comprises 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 organic tin catalyst, and the mass ratio of component A to component B is 3-5:1;

[0007] The preparation method of the acrylate-modified silicone resin comprises: adding α,ω-dihydroxy polydimethylsiloxane, acrylic acid, methyl methacrylate and hydroxyethyl methacrylate into a solvent, and then dropping an initiator solution under nitrogen protection to carry out a polymerization reaction, wherein 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.

[0008] Preferably, the vinyl content of the methyl vinyl silicone rubber is 0.1% to 0.3%, and the molecular weight is 500,000 to 700,000.

[0009] Preferably, the vulcanizing agent is dicumyl peroxide or diisopropylbenzene peroxide.

[0010] In the present invention, cardanol glycidyl ether can be prepared by commercially available or conventional methods in the art, for example:

[0011] Cardanol, epichlorohydrin and benzyltriethylammonium chloride are mixed evenly, and then, under nitrogen protection, the mixture is kept warm for reaction at 70-90°C for 4-6 hours, the temperature is lowered to 55-65°C, and then a sodium hydroxide solution with a mass fraction of 30-40% is added, and the mixture is kept warm for reaction for 3-4 hours. After cooling, the mixture is washed with water until neutral, and then the organic phase is separated, and water and epichlorohydrin in the organic phase are removed by rotary evaporation to obtain the product; wherein the mass ratio of cardanol, epichlorohydrin, benzyltriethylammonium chloride and sodium hydroxide is 100:200-300:0.5-1:15-20.

[0012] Preferably, the preparation method of the silicone sleeve comprises: adding methyl vinyl silicone rubber and fumed silica to a kneader, mixing at 30-40°C for 10-20 minutes, then heating to 60-80°C, adding amino silicone oil and cardanol glycidyl ether and mixing for 20-30 minutes, then adding a vulcanizing agent, and continuing to mix for 5-10 minutes to obtain a mixed rubber material; adding the mixed rubber material to a mold, and vulcanizing and molding at 140-160°C and 5-8MPa for 5-10 minutes to obtain the obtained product.

[0013] Preferably, the inorganic filler is at least one of fumed silica, talcum powder, calcium carbonate and barium sulfate.

[0014] Preferably, the polymerization reaction temperature is 70-80° C. and the time is 2-4 hours.

[0015] Preferably, the material of the batting tube is aluminum alloy or carbon fiber.

[0016] Preferably, a fixing ring is further included, a threaded section connected to the connecting section is provided below the connecting section of the grip handle, the fixing ring is fixedly connected to the threaded section by threads and is used to limit the end of the hitting barrel.

[0017] Preferably, the fixing ring has an internal thread, which is cooperatively connected with the threaded section of the gripping handle.

[0018] Preferably, the method for preparing the ball bat comprises the following steps:

[0019] Apply silicone glue evenly on the connecting section at the upper end of the grip handle, then put the silicone sleeve on the connecting section and solidify to form a first bonding layer; apply silicone glue evenly on the outside of the silicone sleeve, then put the lower end of the inner wall of the batting tube on the silicone sleeve and solidify to form a second bonding layer; then screw the fixing ring onto the threaded section of the grip handle.

[0020] The beneficial effects of the present invention are as follows:

[0021] The bat of the present invention achieves excellent shock-absorbing performance by arranging a silicone sleeve with shock-absorbing effect between the grip handle and the batting barrel and bonding them with silicone glue, wherein an appropriate amount of amino silicone oil and cardanol glycidyl ether are added to the raw materials of the silicone sleeve, and the two are cross-linked during the preparation process of silicone rubber, and more active groups and flexible aliphatic long chains are introduced into the rubber material, thereby improving the toughness and interface bonding force of the rubber material, and strengthening the bonding between the silicone sleeve and the batting barrel and the bonding layer formed by the silicone glue; a suitable acrylate monomer acrylic acid is used The base material α, ω-dihydroxypolydimethylsiloxane of the silicone glue is modified by using methyl methacrylate, methyl methacrylate and hydroxyethyl methacrylate, so as to improve the wetting ability and adhesion of the silicone glue to the silicone sleeve and the batting barrel. Thus, the grip handle of the bat and the batting barrel can be tightly combined together through the adhesive layer formed by the silicone sleeve and the silicone glue, and the adhesive bonding force between the silicone sleeve and the adhesive layer, the handle and the batting barrel is very strong, and it is not easy to peel off under the vibration generated when the bat hits the ball, affecting the shock absorption effect. Therefore, it can have a long-term shock absorption effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a baseball bat based on silicone shock absorption proposed in the present invention. Figure 1 Middle, 1: grip handle, 2: batting barrel, 3: silicone sleeve, 4: fixing ring. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is described in detail below through specific embodiments.

[0024] 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.

[0025] Example 1

[0026] A baseball bat based on silicone shock absorption, the baseball bat comprises a gripping handle 1, a silicone sleeve 3, a fixing ring 4 and an aluminum alloy batting barrel 2 with an opening at the lower end; a connecting section is provided at the upper end of the gripping handle 1, the silicone sleeve 3 is sleeved on the connecting section of the gripping handle, and the connecting section is bonded to the inner side of the silicone sleeve 3 through a first bonding layer, and the lower end of the inner wall of the batting barrel 2 is bonded to the outer side of the silicone sleeve 3 through a second bonding layer; a threaded section connected to the connecting section is provided below the connecting section of the gripping handle 1, the fixing ring 4 has an internal thread, is matched and connected with the threaded section of the gripping handle 1, is fixedly connected to the threaded section through a thread and is used to limit the end of the batting barrel 2;

[0027] The silicone sleeve 3 is made of the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 35 parts of fumed silica, 0.5 parts of dipentadienyl vulcanizer, 1.5 parts of amino silicone oil, and 0.4 parts of cardanol glycidyl ether; the preparation method of the silicone sleeve 3 comprises: adding methyl vinyl silicone rubber and fumed silica to a kneader, mixing at 35° C. for 15 minutes, then heating to 70° C., adding amino silicone oil and cardanol glycidyl ether and mixing for 25 minutes, then adding dipentadienyl vulcanizer, and continuing to mix for 8 minutes to obtain a mixed rubber material; adding the mixed rubber material to a mold, and vulcanizing and molding at 155° C. and 7 MPa for 6 minutes to obtain the obtained material;

[0028] The preparation method of cardanol glycidyl ether is as follows: cardanol, epichlorohydrin and benzyltriethylammonium chloride are mixed uniformly, and then, under nitrogen protection, the mixture is kept warm for reaction at 80°C for 5 hours, the temperature is lowered to 60°C, and then a sodium hydroxide solution with a mass fraction of 30% is added, and the mixture is kept warm for reaction for 3 hours. After cooling, the mixture is washed with water until neutral, and then the organic phase is separated, and water and epichlorohydrin in the organic phase are removed by rotary evaporation to obtain the cardanol glycidyl ether; wherein the mass ratio of cardanol, epichlorohydrin, benzyltriethylammonium chloride and sodium hydroxide is 100:200:0.5:15.

[0029] The first adhesive layer and the second adhesive layer are formed by curing silicone glue, the silicone glue includes component A and component B, component A includes the following raw materials in parts by mass: 100 parts of acrylate-modified silicone resin, 8 parts of methyl silicone oil, and 40 parts of fumed silica, and component B includes the following raw materials in parts by mass: 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, and the mass ratio of component A to component B is 4:1;

[0030] The preparation method of acrylate-modified silicone resin comprises: adding α,ω-dihydroxypolydimethylsiloxane, acrylic acid, methyl methacrylate and hydroxyethyl methacrylate into ethyl acetate, then dripping an ethyl acetate solution of azobisisobutyronitrile under nitrogen protection, and performing polymerization reaction at 75°C for 3 hours to obtain an acrylate-modified silicone resin, wherein the mass ratio of α,ω-dihydroxypolydimethylsiloxane, acrylic acid, methyl methacrylate, hydroxyethyl methacrylate and azobisisobutyronitrile is 1:0.25:1.25:1:0.04.

[0031] The method for preparing the above-mentioned ball bat comprises the following steps:

[0032] Apply silicone glue evenly on the connecting section at the upper end of the gripping handle 1, then put the silicone sleeve 3 on the connecting section, and cure it at room temperature for 12 hours to form a first bonding layer; apply silicone glue evenly on the outside of the silicone sleeve 3, then put the lower end of the inner wall of the aluminum alloy batting tube 2 on the silicone sleeve 3, and cure it at room temperature for 12 hours to form a second bonding layer; then screw the fixing ring 4 into the threaded section of the gripping handle 1.

[0033] Example 2

[0034] The difference between Example 2 and Example 1 is that the silicone sleeve 3 is different.

[0035] The silicone sleeve 3 of Example 2 is made of the following raw materials in parts by mass: 100 parts of methyl vinyl silicone rubber raw rubber, 30 parts of fumed silica, 0.3 parts of di-25-pentane vulcanizer, 1 part of amino silicone oil, and 0.3 parts of cardanol glycidyl ether; the preparation method of the silicone sleeve 3 comprises: adding methyl vinyl silicone rubber raw rubber and fumed silica to a kneader, mixing at 35°C for 15 minutes, then heating to 70°C, adding amino silicone oil and cardanol glycidyl ether and mixing for 25 minutes, then adding di-25-pentane vulcanizer, and continuing to mix for 8 minutes to obtain a mixed rubber material; adding the mixed rubber material to a mold, and vulcanizing and molding at 155°C and 7MPa for 6 minutes to obtain the obtained material.

[0036] Example 3

[0037] The only difference between Example 3 and Example 1 is that the silicone glue is different.

[0038] The silicone glue of Example 3 includes component A and component B, component A includes the following raw materials in parts by mass: 100 parts of acrylate-modified silicone resin, 5 parts of methyl silicone oil, and 30 parts of fumed silica, and component B includes the following raw materials in parts by mass: 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, and the mass ratio of component A to component B is 3:1;

[0039] The preparation method of the acrylate-modified silicone resin comprises: adding α,ω-dihydroxy polydimethylsiloxane, acrylic acid, methyl methacrylate and hydroxyethyl methacrylate into ethyl acetate, then dripping an ethyl acetate solution of azobisisobutyronitrile under nitrogen protection, and performing a polymerization reaction at 75° C. for 3 hours to obtain the acrylate-modified silicone resin, wherein the mass ratio of α,ω-dihydroxy polydimethylsiloxane, acrylic acid, methyl methacrylate, hydroxyethyl methacrylate and azobisisobutyronitrile is 1:0.2:1:0.8:0.03.

[0040] Comparative Example 1

[0041] The difference between Comparative Example 1 and Example 1 is that the silicone sleeve 3 is different.

[0042] The silicone sleeve 3 of comparative example 1 is made of the following raw materials in parts by mass: 100 parts of methyl vinyl silicone rubber raw rubber, 35 parts of fumed silica, and 0.5 parts of di-25-pentane vulcanizer; the preparation method of the silicone sleeve 3 comprises: adding methyl vinyl silicone rubber raw rubber and fumed silica to a kneader, mixing at 35°C for 15 minutes, then heating to 70°C, continuing to mix for 25 minutes, then adding di-25-pentane vulcanizer, and continuing to mix for 8 minutes to obtain a mixed rubber material; adding the mixed rubber material to a mold, and vulcanizing and molding at 155°C and 7MPa for 6 minutes to obtain the obtained material.

[0043] Comparative Example 2

[0044] The only difference between Comparative Example 2 and Example 1 is that the silicone glue is different.

[0045] The silicone glue of Comparative Example 2 includes component A and component B, component A includes the following raw materials in parts by mass: 100 parts of silicone resin, 8 parts of methyl silicone oil, and 40 parts of fumed silica, and component B includes the following raw materials in parts by mass: 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, and the mass ratio of component A to component B is 4:1; the silicone resin is α, ω-dihydroxypolydimethylsiloxane.

[0046] Test example

[0047] Professional softball players used the bats of Example 1 and Comparative Examples 1-2 to practice hitting the ball 1500 times, respectively, for 30 days, hitting the ball 50 times a day. After completing 1500 times of hitting the ball, the bats were subjected to a shock absorption sensory evaluation test, and the test method was: using the bat to hit the ball 20 times, and evaluating whether the hand felt uncomfortable. The evaluation results showed that the bat of Example 1 could still maintain excellent shock absorption performance after 1500 times of hitting the ball, and the player did not feel any discomfort in the hand after using it to hit the ball 20 times; while the shock absorption effect of the bats of Comparative Examples 1-2 deteriorated after 1500 times of hitting the ball, and the player felt obvious discomfort in the hand after using it to hit the ball 20 times. This is because the silicone sleeve formula of Comparative Example 1 does not contain amino silicone oil and cashew phenol glycidyl ether, and the resulting silicone sleeve has insufficient toughness and interfacial bonding strength. After long-term batting practice, it is affected by the vibration during batting, resulting in a certain degree of peeling from the adhesive layer, affecting the shock absorption effect; and the silicone glue of Comparative Example 2 is not modified with acrylate, and its adhesion and wettability are insufficient. It is also subject to peeling due to the vibration after long-term batting, resulting in a decrease in the shock absorption effect.

[0048] 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 baseball bat based on silica gel shock absorption, characterized in that: The bat comprises a gripping handle, a silicone sleeve and a batting tube with an opening at the lower end; a connecting section is provided at the upper end of the gripping handle, the silicone sleeve is arranged on the connecting section of the gripping handle, and the connecting section is bonded to the inner side of the silicone sleeve through a first bonding layer, and the lower end of the inner wall of the batting tube is bonded to the outer side of the silicone sleeve through a second bonding layer; The silicone sleeve is made of the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 30-40 parts of fumed silica, 0.3-0.8 parts of a vulcanizing agent, 1-2 parts of amino silicone oil, and 0.3-0.5 parts of cardanol glycidyl ether; The first adhesive layer and the second adhesive layer are formed by curing silicone glue, and the silicone glue includes component A and component B, component A includes the following raw materials in parts by mass: 100 parts of acrylate-modified silicone resin, 5-10 parts of methyl silicone oil, and 30-50 parts of inorganic filler, and component B includes the following raw materials in parts by mass: 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 organic tin catalyst, and the mass ratio of component A to component B is 3-5:1; The preparation method of the acrylate-modified silicone resin comprises: adding α,ω-dihydroxy polydimethylsiloxane, acrylic acid, methyl methacrylate and hydroxyethyl methacrylate into a solvent, and then dropping an initiator solution under nitrogen protection to carry out a polymerization reaction, wherein 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 silicone-based shock-absorbing baseball bat according to claim 1, characterized in that: The vinyl content of the methyl vinyl silicone rubber raw rubber is 0.1% to 0.3%, and the molecular weight is 500,000 to 700,000.

3. The silicone-based shock-absorbing baseball bat according to claim 1, characterized in that: The vulcanizing agent is dicumyl peroxide or dipentadienyl vulcanizing agent.

4. The silicone-based shock-absorbing baseball bat according to claim 1, characterized in that: The preparation method of the silicone sleeve comprises: adding methyl vinyl silicone rubber and white carbon black into a kneader, mixing at 30-40° C. for 10-20 minutes, then heating to 60-80° C., adding amino silicone oil and cardanol glycidyl ether and mixing for 20-30 minutes, then adding a vulcanizing agent, and continuing mixing for 5-10 minutes to obtain a mixed rubber material; adding the mixed rubber material into a mold, and vulcanizing and molding at 140-160° C. and 5-8 MPa for 5-10 minutes to obtain the silicone sleeve.

5. The silicone-based shock-absorbing baseball bat according to claim 1, characterized in that: The inorganic filler is at least one of fumed silica, talcum powder, calcium carbonate and barium sulfate.

6. The silicone-based shock-absorbing baseball bat according to claim 1, characterized in that: The polymerization reaction temperature is 70-80° C. and the reaction time is 2-4 hours.

7. The silicone-based shock-absorbing baseball bat according to claim 1, characterized in that: The material of the batting tube is aluminum alloy or carbon fiber.

8. The silicone-based shock-absorbing baseball bat according to claim 1, characterized in that: It also includes a fixing ring. A threaded section connected to the connecting section is provided below the connecting section of the grip handle. The fixing ring is fixedly connected to the threaded section through threads and is used to limit the end of the hitting tube.

9. The silicone-based shock-absorbing baseball bat according to claim 8, characterized in that: The fixing ring has an internal thread and is matched and connected with the threaded section of the gripping handle.

10. The silicone-based shock-absorbing baseball bat according to claim 8, characterized in that: The method for preparing the ball bat comprises the following steps: Apply silicone glue evenly on the connecting section at the upper end of the grip handle, then put the silicone sleeve on the connecting section and solidify to form a first bonding layer; apply silicone glue evenly on the outside of the silicone sleeve, then put the lower end of the inner wall of the batting tube on the silicone sleeve and solidify to form a second bonding layer; then screw the fixing ring onto the threaded section of the grip handle.

Images