Golf ball inner core material, preparation method thereof and high-elasticity golf ball

Abstract

The invention relates to the field of rubber materials, and particularly discloses a golf ball inner core material, a preparation method thereof and a high-elasticity golf ball. The invention discloses an inner core material of a golf ball. The inner core material comprises the following raw materials in parts by weight: 100 parts of butadiene rubber, 25-30 parts of zinc acrylate, 0.5-1.5 parts of a vulcanizing agent, 4-8 parts of zinc stearate, 0.4-0.8 part of pentachlorothiophenol, 4-8 parts of zinc oxide and 15-20 parts of filler. The golf ball inner core material has the advantages of being good in rebound resilience and good in hitting resistance, the service life can be prolonged, and a better ball hitting feeling can be brought.

Description

Technical Field

[0001] This application relates to the field of rubber materials technology, and more specifically, to a golf ball core material, a method for preparing the same, and a high-elasticity golf ball. Background Technology

[0002] Golf is a very popular sport, and its popularity is increasing daily. After a ball is struck, its flight distance depends primarily on its initial velocity and launch angle, which are closely related to the energy conversion efficiency of the ball's core when subjected to a massive and instantaneous impact. The core's role is to convert the clubhead's kinetic energy into the ball's elastic potential energy to the maximum extent possible and release it in a very short time, thus generating high rebound and initial velocity. Therefore, the high elasticity of the core material is a key factor determining the golf ball's flight distance.

[0003] At present, golf balls on the market mainly adopt double, triple or multi-layer structure, but its core (inner core) is the core component that determines the ball's rebound performance and feel. The materials used to manufacture the inner core of golf balls in the existing technology and the problems therein are as follows: (1) Traditional polybutadiene rubber base material. At present, more than 90% of the inner core of golf balls use cross-linked polybutadiene rubber as the matrix. By adding zinc oxide, zinc acrylate and other activators and cross-linking agents, and adding fillers such as barium sulfate and calcium carbonate to adjust the weight, the friction and hysteresis effect of the molecular chain segments of traditional polybutadiene when subjected to high-speed impact will cause some kinetic energy to be converted into heat energy, resulting in energy loss and limiting the further improvement of the initial ball speed. Moreover, in order to pursue the high elasticity of golf balls, it is usually necessary to increase the hardness of the inner core, but excessive hardness will lead to the loss of the feel of hitting the ball. Therefore, the existing material system is difficult to achieve a balance between high elasticity, high hardness and low energy loss. Summary of the Invention

[0004] In order to make golf balls have high elasticity and hardness, this application provides a golf ball core material, a method for preparing the same, and a high-elasticity golf ball.

[0005] In a first aspect, this application provides a core material for a golf ball, employing the following technical solution: A golf ball core material comprising the following raw materials in parts by weight: 100 parts butadiene rubber, 25-30 parts zinc acrylate, 0.5-1.5 parts vulcanizing agent, 4-8 parts zinc stearate, 0.4-0.8 parts pentachlorothiophenol, 4-8 parts zinc oxide, and 15-20 parts filler.

[0006] By adopting the above technical solution, during the compounding process of butadiene rubber, the longer butadiene rubber molecular chains will intertwine and coil to form a physical network structure. This structure makes the raw butadiene rubber with high strength and high energy consumption during compounding. Pentachlorophenthiophenol, under the action of mechanical shear and oxygen, can selectively cut the weaker chemical bonds in the rubber molecular chains, thereby reducing the entanglement of the molecular chains and making the molecular chains smoother. After vulcanization, a more regular cross-linked network with fewer defects is formed. Pentachlorophenthiophenol can also make the rubber matrix more fluid and less viscous during compounding, which is conducive to the wetting and dispersion of filler particles, achieving more uniform and finer dispersion. The uniformly dispersed filler can more effectively combine with rubber molecules, reduce internal friction, make stress transmission more uniform, and reduce energy loss. When a golf ball is hit, the optimized network structure can more efficiently store the impact kinetic energy as elastic potential energy and release the elastic potential energy as rebound kinetic energy more quickly, with less energy wasted on friction between molecular chains and filler, reducing hysteresis loss.

[0007] Optionally, the mass ratio of the butadiene rubber, zinc acrylate, and pentachlorothiophenol is 100:28-30:0.5-0.6.

[0008] By adopting the above technical solution, zinc acrylate can react with rubber molecular chains during vulcanization and can also polymerize into nanoscale ion clusters to form a unique rubber-zinc acrylate interpenetrating network. This network can significantly improve the crosslinking density and modulus. At the same time, due to its unique energy dissipation mechanism, it can maintain excellent resilience under high hardness.

[0009] Optionally, the butadiene rubber is neodymium-based butadiene rubber.

[0010] By adopting the above technical solutions, neodymium-based cis-butadiene rubber exhibits good molecular chain regularity, low crystallization tendency, and better elasticity.

[0011] Optionally, the inner core material may also contain 4-6 parts by weight of a graphene-tannic acid-cellulose blend, wherein the mass ratio of graphene, tannic acid and microcrystalline cellulose is 1:1.5-2:1-2.

[0012] By employing the above technical solution, graphene, as a two-dimensional, high-strength, and tough nanolayer, uses tannic acid as a dispersant to prevent graphene from recombinizing and forms hydrogen bonds with other components through its abundant phenolic hydroxyl groups. Microcrystalline cellulose provides one-dimensional, high-modulus nanofibers. The combination of graphene sheets and microcrystalline cellulose allows them to intertwine and form a network structure through hydrogen bonds, which greatly restricts the movement of rubber molecular chains, significantly increases the modulus of the core material, thereby reducing deformation under impact and storing energy more efficiently, which helps to improve the initial speed of the golf ball. In addition, the construction of the network structure, when combined with cis-butadiene rubber, forms a continuous and rigid nanoskeleton. Impact stress can be transmitted quickly and efficiently through the rigid nanonetwork without relying on the slow rearrangement and friction of rubber molecular chains, thereby reducing dynamic hysteresis loss and allowing more impact kinetic energy to be stored and converted into elastic potential energy of rebound, thus improving elasticity.

[0013] Optionally, the graphene-tannic acid-cellulose blend is prepared using the following method: Graphene and tannic acid were mixed, deionized water was added, the mixture was sonicated and allowed to stand, and the supernatant was taken to obtain an aqueous solution of graphene. Microcrystalline cellulose was added to deionized water, KH560 was added, and after sonication, graphene aqueous solution was added. The mixture was stirred and reacted for 10-12 hours to obtain a blend. Liquid butadiene rubber and blend liquid are mixed, flocculant is added, and after stirring, the mixture is filtered and dried to obtain the blend.

[0014] By adopting the above technical solution, the alkoxy group at one end of the silane coupling agent can react with the hydroxyl groups on the surface of microcrystalline cellulose, while the other end serves as an active reaction site that can react with the rubber molecular chain under vulcanization conditions. Furthermore, the phenolic hydroxyl groups of tannic acid can also interact strongly with liquid cis-butadiene rubber, making the graphene / microcrystalline cellulose network not only a simple physical filler but also part of the rubber crosslinking network. This makes the crosslinking network more robust and stable, less prone to damage under high-frequency, high-stress impacts, and ensures stable elasticity output. The flocculant can co-precipitate the liquid cis-butadiene rubber and graphene-microcrystalline cellulose, allowing the nanomaterials and rubber molecules to adhere tightly at the microscale, forming a pre-dispersed masterbatch. This reduces the burden of subsequent mixing and increases the compatibility of the blend with the cis-butadiene rubber matrix, enhancing the tensile strength and tear resistance of the core material.

[0015] Optionally, the vulcanizing agent comprises sulfur and dicumyl peroxide in a mass ratio of 1:0.3-0.5.

[0016] By adopting the above technical solution, a composite vulcanization system of peroxide DCP and sulfur can be used to form mixed cross-linking bonds, resulting in better mechanical strength of the inner core material.

[0017] Optionally, the filler is selected from at least one of barium sulfate, carbon black, calcium carbonate, titanium dioxide, talc, kaolin, clay, bentonite, and mica powder.

[0018] Secondly, this application provides a method for preparing a golf ball core material, employing the following technical solution: A method for preparing a golf ball core material includes the following steps: Polybutadiene rubber is plasticized at 50-60℃ for 1-2 minutes, zinc stearate, zinc oxide, and pentachlorothiophenol are added and mixed for 1-2 minutes, filler and zinc acrylate are added and mixed at 90-110℃ for 5-10 minutes, vulcanizing agent is added and mixed for 5-10 minutes, and then discharged to obtain the core material of golf balls.

[0019] Thirdly, this application provides a high-elasticity golf ball, which adopts the following technical solution: A high-elasticity golf ball includes an inner core made of the golf ball inner core material or the golf ball inner core material made by the method, and a wear-resistant polyurethane outer layer surrounding the inner core.

[0020] By adopting the above technical solution, polyurethane is softer than traditional sarin polymer as the outer shell. When the clubface, especially grooved wedges or irons, hits the ball, the soft polyurethane shell grips the clubface more easily, producing greater deformation and achieving a higher spin rate. Combined with a highly elastic inner core, the softness of the polyurethane shell reduces the loss of initial energy, allowing force to be transferred to the inner core more effectively. This provides extremely high spin rate and control when hitting irons without affecting core distance. In addition, the abrasion resistance of polyurethane gives the outer layer extremely high tear resistance, wear resistance, and cut resistance, reducing the possibility of the polyurethane outer layer being scratched or cut, protecting the integrity of the outer layer's uneven structure, making the golf ball's flight performance more stable, its service life longer, and its appearance better maintained.

[0021] Optionally, the wear-resistant polyurethane outer layer comprises polyurethane material in a mass ratio of 1:0.05-0.15 and molybdenum disulfide-supported polydopamine-modified nano zinc oxide.

[0022] By adopting the above technical solution, molybdenum disulfide has a unique layered structure, with weak van der Waals forces connecting the layers. When subjected to friction, the layers easily slip, forming an effective lubricating film on the friction surface. This reduces the coefficient of friction of the polyurethane surface, improves the wear and scratch resistance of the golf ball's outer layer, and prevents wear or scratches when the golf clubface impacts or scrapes against the ground or trees. Nano zinc oxide, a high-hardness nano-ion, is uniformly dispersed in the polyurethane matrix, playing a role in bearing and dispersing stress. It can improve the hardness, modulus, and resistance to compressive deformation of the outer layer. When subjected to pressure, these rigid particles prevent excessive deformation and tearing of the polyurethane molecular chains, making the outer layer more rigid and resistant to wear. Nano zinc oxide provides rigid support and bears the main load, while molybdenum disulfide provides lubrication and reduces frictional resistance. The combination of the two gives the polyurethane outer layer high hardness, making it less prone to wear and improving its abrasion resistance. The adhesive effect of polydopamine can firmly bond molybdenum disulfide and nano zinc oxide to the polyurethane matrix, preventing them from falling off during friction and improving service life.

[0023] Optionally, the preparation method of the molybdenum disulfide-supported polydopamine-modified nano zinc oxide is as follows: Adjust the pH of a 1 g / L dopamine hydrochloride solution to 8.5, add nano zinc oxide, heat and stir at 60°C for 8 hours, filter, wash, dry, grind and add to anhydrous ethanol, sonicate and add n-dodecyl mercaptan, heat to 60°C and stir for 12 hours, add molybdenum disulfide, continue heating and stirring for 6 hours, filter, wash and dry.

[0024] By adopting the above technical solution, hydrochloric acid dopamine solution forms polydopamine in alkaline and alkaline environments, which can then undergo a Maillard addition reaction with more n-dodecyl mercaptan, thereby grafting dodecyl mercaptan onto polydopamine-modified nano-zinc oxide particles and finally loading them onto the surface of molybdenum disulfide. Polydopamine has extremely strong adhesion, and the nano-zinc oxide modified with polydopamine can improve the dispersibility of nanoparticles, thus achieving a better and more uniform loading effect on molybdenum disulfide, obtaining composite particles with low surface energy characteristics. Polydopamine undergoes a cross-linking reaction with polyurethane, making the synapses on the outer surface tightly bonded and tightly bonded to the inner layer, while also having superhydrophobic effect and excellent mechanical strength, which can improve the wear resistance of the outer layer.

[0025] In summary, this application has the following beneficial effects: 1. Because this application uses a specific ratio of butadiene rubber, zinc acrylate and pentachlorothiophenol as the raw materials of the inner core, under the action of pentachlorothiophenol, the butadiene rubber has better fluidity during mixing, which can make the filler and rubber molecules evenly combine, reduce internal friction and energy loss, and form a more regular cross-linked network with fewer defects, thereby achieving the unity of high hardness and high elasticity.

[0026] 2. In this application, graphene, tannic acid, microcrystalline cellulose, and silane coupling agent KH560 are preferred for preparing the blend. Graphene and microcrystalline cellulose can form a network structure, which restricts the movement of rubber molecular chains, increases the modulus of the inner core material, reduces hysteresis loss, and improves the rapid and efficient transmission of impact stress. In addition, the use of liquid butadiene rubber and flocculant for post-treatment can make the network structure more stable and less susceptible to damage by impact stress. At the same time, it improves the dispersion uniformity of the blend and the rubber matrix and improves the mechanical strength of the inner core material.

[0027] 3. In this application, it is preferred that the inner core, made of an inner core material, is covered with a wear-resistant polyurethane outer layer. The outer layer contains molybdenum dioxide-loaded polydopamine-modified nano zinc oxide, which can effectively improve the wear resistance and cutting resistance of the outer layer, reduce the generation of scratches and cuts, maintain the integrity of the appearance, and extend the service life. Detailed Implementation

[0028] The following embodiments provide a further detailed description of this application.

[0029] Examples of preparation of graphene-tannic acid-cellulose blends 1-5 Preparation Example 1: (1) Mix 1g of graphene and 2g of tannic acid, add 100mL of deionized water, sonicate for 10min and let stand, take the supernatant to prepare graphene aqueous solution. The graphene is selected from Qinghe County Dongfu Metal Materials, model DF-25. (2) Add 2g of microcrystalline cellulose to 100mL of deionized water, add silane coupling agent KH560, sonicate for 10min, add graphene aqueous solution, stir at 5000r / min for 12h to obtain a blended solution. The mass ratio of microcrystalline cellulose to silane coupling agent KH560 is 1:0.1. The microcrystalline cellulose is selected from Shandong Tunan New Materials, model 032. (3) Mix 50g of liquid butadiene rubber and the blend liquid, add flocculant calcium chloride, stir evenly, filter and dry to obtain the blend. The amount of flocculant calcium chloride is 30% of the total weight of liquid butadiene rubber and blend liquid. The liquid butadiene rubber is selected from Dongguan Shenghao Plastic Raw Materials, with product number 5541254.

[0030] Preparation Example 2: (1) Mix 1g of graphene and 1.5g of tannic acid, add 100mL of deionized water, sonicate for 10min and let stand, take the supernatant to prepare graphene aqueous solution. The graphene is selected from Qinghe County Dongfu Metal Materials, model DF-25. (2) Add 1g of microcrystalline cellulose to 100mL of deionized water, add silane coupling agent KH560, sonicate for 10min, add graphene aqueous solution, stir at 5000r / min for 10h to obtain a blended solution. The mass ratio of microcrystalline cellulose to silane coupling agent KH560 is 1:0.1. The microcrystalline cellulose is selected from Shandong Tunan New Materials, model 032. (3) Mix 50g of liquid butadiene rubber and the blend liquid, add flocculant calcium chloride, stir evenly, filter and dry to obtain the blend. The amount of flocculant calcium chloride is 30% of the total weight of liquid butadiene rubber and blend liquid. The liquid butadiene rubber is selected from Dongguan Shenghao Plastic Raw Materials, with product number 5541254.

[0031] Preparation Example 3: (1) Mix 1g of graphene and 2g of tannic acid, add 100mL of deionized water, sonicate for 10min and let stand, take the supernatant to prepare graphene aqueous solution. The graphene is selected from Qinghe County Dongfu Metal Materials, model DF-25. (2) Add 2g of microcrystalline cellulose to 100mL of deionized water, add silane coupling agent KH560, sonicate for 10min, add graphene aqueous solution, stir at 5000r / min for 12h to obtain a blend, filter and dry to obtain a blend. The mass ratio of microcrystalline cellulose to silane coupling agent KH560 is 1:0.1. The microcrystalline cellulose is selected from Shandong Tunan New Materials, model 032.

[0032] Preparation Example 4: (1) Mix 1g of graphene and 2g of tannic acid, add 100mL of deionized water, sonicate for 10min and let stand, take the supernatant to obtain a graphene aqueous solution, filter and dry to obtain a blend. The graphene is selected from Qinghe County Dongfu Metal Materials, model DF-25.

[0033] Preparation Example 5: (1) 1g of graphene was added to 100mL of deionized water, sonicated for 10min and then allowed to stand. The supernatant was taken to obtain a graphene aqueous solution. The graphene was selected from Dongfu Metal Materials of Qinghe County, model DF-25. (2) Add 2g of microcrystalline cellulose to 100mL of deionized water, add silane coupling agent KH560, sonicate for 10min, add graphene aqueous solution, stir at 5000r / min for 12h to obtain a blend, filter and dry to obtain a blend. The mass ratio of microcrystalline cellulose to silane coupling agent KH560 is 1:0.1. The microcrystalline cellulose is selected from Shandong Tunan New Materials, model 032.

[0034] Example 6: Preparation of molybdenum disulfide-supported polydopamine-modified nano zinc oxide Preparation Example 6: A 1 g / L dopamine hydrochloride solution was adjusted to pH 8.5 with ammonia water. 12 g of nano zinc oxide was added, and the mixture was heated and stirred at 60 °C for 8 h. After vacuum filtration, the solution was washed twice with anhydrous ethanol and deionized water, dried, ground, and added to 200 ml of anhydrous ethanol. After ultrasonic vibration, 2 ml of n-dodecyl mercaptan was added, and the mixture was heated and stirred at 60 °C for 12 h. 0.6 g of molybdenum disulfide was added, and the mixture was heated and stirred for another 6 h. After vacuum filtration, the solution was washed twice with anhydrous ethanol and deionized water, and dried. Example

[0035] Example 1: A golf ball core material, the raw material amounts are shown in Table 1, wherein the butadiene rubber is neodymium-based butadiene rubber, selected from Hubei Guangcheng New Materials, grade CB24, the vulcanizing agent includes sulfur and dicumyl peroxide in a mass ratio of 1:0.5, and the filler is carbon black.

[0036] The method for preparing the above-mentioned golf ball core material includes the following steps: Polybutadiene rubber was plasticized at 60°C for 2 minutes, then zinc stearate, zinc oxide, and pentachlorothiophenol were added and mixed for 2 minutes. Filler and zinc acrylate were added and mixed at 110°C for 5 minutes. A vulcanizing agent was added and mixed for 10 minutes. The mixture was then discharged to obtain the core material for golf balls.

[0037] Table 1. Raw material consumption of golf ball core materials in Examples 1-5 Raw materials / kg Example 1 Example 2 Example 3 Example 4 Example 5 butadiene rubber 100 100 100 100 100 Zinc acrylate 28 30 25 27 29 vulcanizing agent 1 1 1 1 1 Zinc stearate 6 6 6 6 6 Pentachlorothiophenol 0.6 0.5 0.6 0.6 0.8 Zinc oxide 6 6 6 6 6 filler 18 18 18 18 18 Examples 2-5: A golf ball core material, which differs from Example 1 in that the amount of raw materials used is shown in Table 1.

[0038] Example 6: A golf ball core material, differing from Example 1 in that 6 kg of a graphene-tannic acid-cellulose blend is added to the raw materials. This blend was prepared in Preparation Example 1. The preparation method of this golf ball core material includes the following steps: Polybutadiene rubber was plasticized at 60°C for 2 minutes, then zinc stearate, zinc oxide, and pentachlorothiophenol were added and mixed for 2 minutes. A blend of graphene-tannic acid-cellulose, filler, and zinc acrylate were added and mixed at 110°C for 5 minutes. A vulcanizing agent was added and mixed for 10 minutes. The mixture was then discharged to obtain the core material for golf balls.

[0039] Example 7: A golf ball core material, differing from Example 1 in that 4 kg of a graphene-tannic acid-cellulose blend is added to the raw materials. This blend was prepared in Preparation Example 2. The preparation method of this golf ball core material includes the following steps: Polybutadiene rubber was plasticized at 60°C for 2 minutes, then zinc stearate, zinc oxide, and pentachlorothiophenol were added and mixed for 2 minutes. A blend of graphene-tannic acid-cellulose, filler, and zinc acrylate were added and mixed at 110°C for 5 minutes. A vulcanizing agent was added and mixed for 10 minutes. The mixture was then discharged to obtain the core material for golf balls.

[0040] Example 8: A golf ball core material, which differs from Example 6 in that the graphene-tannic acid-cellulose blend is prepared in Preparation Example 3.

[0041] Example 9: A golf ball core material, which differs from Example 6 in that the graphene-tannic acid-cellulose blend is prepared in Preparation Example 4.

[0042] Example 10: A golf ball core material, which differs from Example 6 in that the graphene-tannic acid-cellulose blend is prepared in Example 5.

[0043] Comparative Example Comparative Example 1: A golf ball core material, which differs from Example 1 in that it does not contain pentachlorothiophenol.

[0044] Application examples Application Example 1: A high-elasticity golf ball includes an inner core and a wear-resistant polyurethane outer layer surrounding the outer surface of the inner core. The inner core is made of the golf ball core material prepared in Example 1, and the diameter of the inner core is 42 mm. The thickness of the wear-resistant polyurethane outer layer is 0.4 mm, and the diameter of the golf ball is 42.8 mm. The raw material of the wear-resistant polyurethane layer is a mixture of polyurethane material and molybdenum disulfide-loaded polydopamine-modified nano zinc oxide in a mass ratio of 1:0.15. The polyurethane material is selected from Dongguan Jiurui Plastic Raw Materials, grade 90A. The molybdenum disulfide-loaded polydopamine-modified nano zinc oxide is prepared in Preparation Example 6. This golf ball is manufactured using a conventional injection molding process.

[0045] Application Example 2: A high-elasticity golf ball includes an inner core and a wear-resistant polyurethane outer layer surrounding the outer surface of the inner core. The inner core is made of the golf ball core material prepared in Example 1, and the diameter of the inner core is 42 mm. The thickness of the wear-resistant polyurethane outer layer is 0.4 mm, and the diameter of the golf ball is 42.8 mm. The raw material of the wear-resistant polyurethane layer is a mixture of polyurethane material and molybdenum disulfide-loaded polydopamine-modified nano zinc oxide in a mass ratio of 1:0.1. The polyurethane material is selected from Dongguan Jiurui Plastic Raw Materials, grade 90A. The molybdenum disulfide-loaded polydopamine-modified nano zinc oxide is prepared in Preparation Example 6. This golf ball is manufactured using a conventional injection molding process.

[0046] Application Example 3: A high-elasticity golf ball, differing from Application Example 1 in that the molybdenum disulfide-loaded polydopamine-modified nano-zinc oxide in the wear-resistant polyurethane outer layer does not contain molybdenum disulfide. The specific method is as follows: the pH of a 1 g / L dopamine hydrochloride solution is adjusted to 8.5, 12 g of nano-zinc oxide is added, and the mixture is heated and stirred at 60°C for 8 hours. After vacuum filtration, the mixture is washed twice with anhydrous ethanol and deionized water, dried, ground, and added to 200 ml of anhydrous ethanol. After ultrasonic vibration, 2 ml of n-dodecyl mercaptan is added, and the mixture is heated and stirred at 60°C for 12 hours. After vacuum filtration, the mixture is washed twice with anhydrous ethanol and deionized water, and dried.

[0047] Application Example 4: A high-elasticity golf ball, which differs from Application Example 1 in that the wear-resistant polyurethane outer layer consists of polyurethane material and nano zinc oxide in a mass ratio of 1:0.15.

[0048] Application Example 5: A high-elasticity golf ball, which differs from Application Example 1 in that the wear-resistant polyurethane outer layer consists of polyurethane material and molybdenum disulfide in a mass ratio of 1:0.15.

[0049] Application Example 6: A high-elasticity golf ball, which differs from Application Example 1 in that the wear-resistant polyurethane layer is made of only polyurethane material, which is selected from Dongguan Jiurui Plastic Raw Materials, grade 90A.

[0050] Performance testing I. Testing of golf ball core material: The core material was prepared according to the methods in the examples and comparative examples, and its performance was tested according to the following methods. The test results are recorded in Table 2.

[0051] 1. Specific gravity: Tested in accordance with GB / T533-2008 "Determination of density of vulcanized rubber or thermoplastic rubber".

[0052] 2. Hardness: Tested in accordance with GB / T531.1-2008 "Test method for indentation hardness of vulcanized rubber or thermoplastic rubber - Shore hardness tester method".

[0053] 3. Tensile strength: Tested in accordance with GB / T528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber".

[0054] 4. Tear strength: Tested in accordance with GB / T529-2008 "Determination of tear strength of vulcanized rubber or thermoplastic rubber (trouser-shaped, right-angled and crescent-shaped specimens)".

[0055] 5. Resilience rate: Tested in accordance with GB / T1681-2009 "Determination of resilience of vulcanized rubber".

[0056] 6. Compression: Compression is measured by applying a 200-pound load to the inner core material and measuring its deflection in inches. Compression = 180 - (deflection × 1000).

[0057] Table 2 Performance test results of golf ball core materials As can be seen from the data in Table 2 and the original dosages in Examples 1-5, the inner core material made by mixing neodymium-based cis-butadiene rubber with pentachlorobenzyl thiophenol, zinc acrylate, etc. in a certain proportion has a tensile strength greater than 21 MPa and a specific gravity less than 1.25 g / cm³. 3 It has high tear strength and high resilience, and has the advantages of tear resistance, impact resistance and good feel.

[0058] Compared with Example 1, Examples 6 and 7 also added a certain amount of graphene-tannic acid-cellulose blend to the inner core material. It can be seen that the specific gravity of the inner core material increased, the hardness improved, the tensile and tear resistance was further improved, the resilience increased, and the compressibility increased. This shows that the addition of the blend can effectively improve the resilience and other properties of the inner core material.

[0059] In Example 8, the graphene-tannic acid-cellulose blend prepared in Preparation Example 3 was used. Compared with Example 6, liquid cis-butadiene rubber and flocculant were not used. It can be seen that the tensile strength and tear strength of the inner core material are reduced, and the tensile and tear resistance is reduced.

[0060] Compared to Example 6, Example 9 used the graphene-tannic acid-cellulose blend prepared in Preparation Example 4, in which only graphene and tannic acid were used. As shown in Table 2, the resilience of the core material prepared in Example 9 was reduced. Example 10 used the graphene-tannic acid-cellulose blend prepared in Preparation Example 5, in which only graphene and microcrystalline cellulose were used. It can be seen that the properties of the core material prepared in Example 9 were lower than those in Example 6.

[0061] Compared with Example 1, Comparative Example 1 did not contain pentachlorothiophenol, and the elasticity of the prepared inner core material was significantly reduced, and its tear resistance and tensile strength were weakened.

[0062] II. Testing of high-elasticity golf balls: Prepare golf balls according to the method in the application example, and conduct performance testing according to the following methods. Record the test results in Table 3.

[0063] 1. Relative volumetric wear: Tested in accordance with GB / T9867-2008 "Determination of abrasion resistance of vulcanized rubber or thermoplastic rubber (rotary roller abrasion tester method)".

[0064] 2. Number of impacts: Take 12 golf balls from each application example and shoot them at a speed of 175 feet per second to hit the metal plate until the ball breaks. Record the number of impacts of the first 6 balls that break and take the average of the results.

[0065] Table 3. Test results of golf balls project <![CDATA[Relative volume wear amount / mm 3 > Number of impacts / times Application Example 1 53.1 92 Application Example 2 53.7 90 Application Example 3 57.8 87 Application Example 4 59.2 82 Application Example 5 57.2 85 Application Example 6 63.1 68 In Application Examples 1 and 2, the inner core material prepared in Example 1 was used as the inner core, and polyurethane material and molybdenum dioxide-supported polydopamine-modified nano zinc oxide were used to make a wear-resistant polyurethane outer layer in different amounts. The golf balls made in this way have good wear resistance, are not easy to scratch, have a large number of impacts, strong impact resistance, and better durability.

[0066] In Application Example 3, the wear-resistant polyurethane layer did not contain molybdenum disulfide. Instead, it used dopamine-modified nano-zinc oxide and utilized n-dodecyl mercaptan to improve its hydrophobicity. As can be seen in Table 3, the number of impacts decreased and the relative wear increased. This indicates that increasing the dispersion of nano-zinc oxide in the outer layer of polyurethane improves the interfacial strength between the inner core and the outer layer, reduces cracking, and increases impact resistance.

[0067] Application Example 4 uses polyurethane material and nano zinc oxide, and Application Example 5 uses polyurethane material and molybdenum disulfide. As shown in Table 3, compared with Application Example 1, the golf balls prepared in Application Example 4 and Application Example 5 have reduced abrasion resistance and impact resistance.

[0068] In Application Example 6, only polyurethane material was used to prepare the outer layer. Compared with Application Example 1, the relative volumetric wear of the golf ball increased significantly, and the impact resistance was weakened. This indicates that the addition of molybdenum dioxide-loaded polydopamine-modified nano zinc oxide can significantly improve the wear resistance and impact resistance of the outer layer.

[0069] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A core material for a golf ball, characterized in that, The inner core material comprises the following raw materials in parts by weight: 100 parts butadiene rubber, 25-30 parts zinc acrylate, 0.5-1.5 parts vulcanizing agent, 4-8 parts zinc stearate, 0.4-0.8 parts pentachlorothiophenol, 4-8 parts zinc oxide, and 15-20 parts filler.

2. The golf ball core material according to claim 1, characterized in that: The mass ratio of the butadiene rubber, zinc acrylate, and pentachlorothiophenol is 100:28-30:0.5-0.

6.

3. The golf ball core material according to claim 1, characterized in that: The butadiene rubber is neodymium-based butadiene rubber.

4. The golf ball core material according to claim 1, characterized in that: The inner core material also contains 4-6 parts by weight of a graphene-tannic acid-cellulose blend, with the mass ratio of graphene, tannic acid and microcrystalline cellulose being 1:1.5-2:1-2.

5. The golf ball core material according to claim 4, characterized in that: The graphene-tannic acid-cellulose blend was prepared using the following method: Graphene and tannic acid were mixed, deionized water was added, the mixture was sonicated and allowed to stand, and the supernatant was taken to obtain an aqueous solution of graphene. Microcrystalline cellulose was added to deionized water, KH560 was added, and after sonication, graphene aqueous solution was added. The mixture was stirred and reacted for 10-12 hours to obtain a blend. Liquid butadiene rubber and blend liquid are mixed, flocculant is added, and after stirring, the mixture is filtered and dried to obtain the blend.

6. The golf ball core material according to claim 1, characterized in that: The vulcanizing agent comprises sulfur and dicumyl peroxide in a mass ratio of 1:0.3-0.

5.

7. The golf ball core material according to claim 1, characterized in that: The filler is selected from at least one of barium sulfate, carbon black, calcium carbonate, titanium dioxide, talc, kaolin, clay, bentonite, and mica powder.

8. A method for preparing the golf ball core material according to any one of claims 1-7, characterized in that: Includes the following steps: Polybutadiene rubber is plasticized at 50-60℃ for 1-2 minutes, zinc stearate, zinc oxide, and pentachlorothiophenol are added and mixed for 1-2 minutes, filler and zinc acrylate are added and mixed at 90-110℃ for 5-10 minutes, vulcanizing agent is added and mixed for 5-10 minutes, and then discharged to obtain the core material of golf balls.

9. A high-elasticity golf ball, characterized in that, The product includes an inner core made of the golf ball inner core material as described in any one of claims 1-7 or the golf ball inner core material made by the method described in claim 8, and an abrasion-resistant polyurethane outer layer surrounding the inner core.

10. The high-elasticity golf ball according to claim 9, characterized in that, The wear-resistant polyurethane outer layer comprises polyurethane material in a mass ratio of 1:0.05-0.15 and molybdenum disulfide-supported polydopamine-modified nano zinc oxide.

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