Rubber composition, golf ball core, preparation method and application

Abstract

The invention discloses a rubber composition, a golf ball core, a preparation method and application. The rubber composition provided by the invention is prepared from the following components in parts by weight: 30 to 80 parts of neodymium-series rare earth butadiene rubber, 10 to 70 parts of functional additive, 4 to 30 parts of filler and 0.1 to 13 parts of peroxide, wherein the number-average molecular weight of the neodymium-series rare earth butadiene rubber is 90 kDa to 100 kDa, and the molecular weight distribution index is 2.6 to 2.74. The golf ball core prepared from the rubber composition provided by the invention has low compression performance, high rebound resilience and striking resistance, and the prepared golf ball has high comfort and can be used as a ball core of a golf game ball.

Description

Technical Field

[0001] The present application belongs to the field of rubber technology and relates to a rubber composition, a golf ball core, a preparation method and an application. Background Art

[0002] Golf is a sport that strives for precision and distance. As the core equipment of this sport, golf balls typically consist of a core and a cover. The core is the key component that determines the flight performance of the golf ball, and its performance directly affects the overall performance of the ball. Golf ball cores are mostly made of highly elastic rubber. In recent years, with the popularity of golf and the improvement of competitive level, people have higher demands for golf ball comfort. However, existing golf ball cores still have some shortcomings in terms of compression resistance, rebound performance, and impact resistance. Summary of the Invention

[0003] Based on this, it is necessary to provide a rubber composition, a golf ball core, a preparation method and an application. The golf ball core prepared from the provided rubber composition has low compression performance, high rebound performance and impact resistance.

[0004] In some embodiments, a rubber composition is provided, comprising, by weight, 30 to 80 parts of neodymium rare earth butadiene rubber, 10 to 70 parts of a functional additive, 4 to 30 parts of a filler, and 0.1 to 13 parts of a peroxide.

[0005] The number average molecular weight of the neodymium-based rare earth butadiene rubber is 90 kDa to 100 kDa, and the molecular weight distribution index is 2.6 to 2.74.

[0006] In some embodiments, the provided rubber composition includes, by weight, 55 to 65 parts of neodymium-based rare earth butadiene rubber, 15 to 30 parts of functional additives, 5 to 10 parts of fillers, and 1 to 5 parts of peroxide.

[0007] In some embodiments, the neodymium-based rare earth butadiene rubber satisfies one or more of the following conditions:

[0008] (1) The Mooney viscosity of the neodymium rare earth butadiene rubber is 48MU to 60MU;

[0009] (2) The cis content of the neodymium-based rare earth butadiene rubber is greater than or equal to 97%;

[0010] (3) The volatile matter content of the neodymium rare earth butadiene rubber is less than or equal to 0.75 wt %;

[0011] (4) the ash content of the neodymium rare earth butadiene rubber is less than or equal to 0.30 wt %; and

[0012] (5) The weight average molecular weight of the neodymium-based rare earth butadiene rubber is 260 kDa to 270 kDa.

[0013] In some embodiments, the neodymium-based rare earth butadiene rubber satisfies one or more of the following conditions:

[0014] (1) The number average molecular weight of the neodymium rare earth butadiene rubber is 97.6 kDa to 98.9 kDa;

[0015] (2) The weight average molecular weight of the neodymium rare earth butadiene rubber is 267 kDa to 269.9 kDa;

[0016] (3) The molecular weight distribution index of the neodymium rare earth butadiene rubber is 2.73 to 2.74;

[0017] (4) The Mooney viscosity of the neodymium rare earth butadiene rubber is 50MU to 55MU;

[0018] (5) The cis content of the neodymium-based rare earth butadiene rubber is 97% to 98%;

[0019] (6) The volatile matter content of the neodymium rare earth butadiene rubber is less than or equal to 0.30 wt %; and

[0020] (7) The ash content of the neodymium-based rare earth butadiene rubber is 0.12 wt% to 0.15 wt%.

[0021] In some embodiments, a rubber composition is provided that satisfies one or more of the following conditions:

[0022] (1) The functional additive includes one or more of zinc acrylate, triallyl isocyanurate, zinc oxide, and zinc stearate; and

[0023] (2) The filler includes one or more of calcium carbonate, calcium stearate, calcium hydroxide, titanium dioxide, and diatomaceous earth.

[0024] In some embodiments, in the provided rubber composition, the peroxide includes one or more of dicumyl peroxide, di-tert-butyl peroxide, dibenzoyl peroxide, 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane, and 2,5-dimethyl-2,5-di-tert-butylperoxyhexane.

[0025] In some embodiments, a use of the rubber composition in preparing a golf ball core is provided.

[0026] In some embodiments, a golf ball core is provided, wherein raw materials for preparing the golf ball core include the rubber composition.

[0027] In some embodiments, a method for preparing a golf ball core is provided, comprising the following steps:

[0028] Performing a first mastication on the neodymium rare earth butadiene rubber to obtain a first masterbatch;

[0029] The first masterbatch is mixed with a functional additive and a filler, and subjected to a first mixing process to obtain a second masterbatch;

[0030] mixing the second masterbatch with peroxide and performing a second mixing to obtain a third masterbatch;

[0031] The third masterbatch is subjected to a second mastication to obtain a rubber compound;

[0032] vulcanizing the rubber mix to prepare the golf ball core;

[0033] The raw materials for preparing the golf ball core include, by weight, 30 to 80 parts of neodymium rare earth butadiene rubber, 10 to 70 parts of functional additives, 4 to 30 parts of fillers, and 0.1 to 13 parts of peroxide.

[0034] The number average molecular weight of the neodymium-based rare earth butadiene rubber is 90 kDa to 100 kDa, and the molecular weight distribution index is 2.6 to 2.74.

[0035] In some embodiments, a method for preparing a golf ball core is provided that satisfies one or more of the following conditions:

[0036] (1) The temperature of the first mastication is 60°C to 70°C, and the time of the first mastication is 40s to 80s;

[0037] (2) The temperature of the first mixing is 60° C. to 70° C., and the time of the first mixing is 100 s to 150 s;

[0038] (3) The temperature of the second mixing is 60°C to 70°C, and the time of the second mixing is 70s to 100s;

[0039] (4) the temperature of the second mastication is 60° C. to 70° C., and the time of the second mastication is 40 seconds to 80 seconds; and

[0040] (5) The vulcanization temperature is 100℃~200℃, and the vulcanization time is 400s~800s.

[0041] The golf ball core prepared from the rubber composition provided above has low compression performance, high resilience and impact resistance. The golf ball prepared is highly comfortable and can be used as the core of a golf ball for competition. DETAILED DESCRIPTION

[0042] To facilitate understanding of the present invention, the present invention is described more fully below, with preferred embodiments thereof being provided. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0043] It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0045] Unless otherwise specified or incompatible herewith, the terms and phrases used herein shall have the following meanings:

[0046] The terms "and / or", "or / and", and "and / or" used in this application include any one of two or more related listed items, and also include any and all combinations of the related listed items, and the said any and all combinations include any two related listed items, any more related listed items, or a combination of all related listed items. It should be noted that when at least three items are connected by at least two conjunctions selected from "and / or", "or / and", and "and / or", it should be understood that in this application, the technical solution undoubtedly includes technical solutions that are all connected by "logical and", and undoubtedly includes technical solutions that are all connected by "logical or". For example, "A and / or B" includes three parallel solutions: A, B and "a combination of A and B".

[0047] In this application, "plurality", "multiple", "multiple times", "multiples", etc., unless otherwise specified, refer to a quantity greater than or equal to 2. For example, "one or more" means one or more than or equal to two.

[0048] The terms "combination thereof", "any combination thereof", "any combination thereof" and the like used in this application include all suitable combinations of any two or more of the listed items.

[0049] In this application, the "suitable" mentioned in "suitable combination", "suitable method", "any suitable method", etc. is based on the ability to implement the technical solution of this application, solve the technical problems of this application, and achieve the expected technical effects of this application.

[0050] In this application, "preferred", "better", "more preferred" and "suitable" are only used to describe implementation methods or examples with better effects. It should be understood that they do not constitute a limitation on the scope of protection of this application.

[0051] In this application, "further", "further", "particularly" and the like are used for descriptive purposes to indicate differences in content, but should not be understood as limiting the scope of protection of this application.

[0052] In this application, the terms "optionally," "optional," and "optional" mean optional or dispensable, i.e., they refer to either option being selected from two parallel options: "with" or "without." If a technical solution contains multiple "optional" clauses, each "optional" clause is independent unless otherwise specified and there are no contradictions or constraints.

[0053] In the present invention, in the "first aspect," "second aspect," "third aspect," "fourth aspect," etc., the terms "first," "second," "third," "fourth," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or quantity, nor as implicitly indicating the importance or quantity of the technical features indicated. Furthermore, "first," "second," "third," "fourth," etc. serve only as non-exhaustive enumeration and description and should be understood not to constitute a closed-ended limitation on quantity.

[0054] In this application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0055] In this application, when referring to a numerical interval (i.e., a numerical range), unless otherwise specified, the optional numerical distribution is considered continuous within the above numerical interval and includes the two numerical endpoints of the numerical range (i.e., the minimum and maximum values), as well as each numerical value between the two numerical endpoints. Unless otherwise specified, when a numerical interval refers only to integers within the numerical interval, it includes the two endpoint integers of the numerical range, as well as each integer between the two endpoints. In this article, it is equivalent to directly listing each integer, such as t is an integer selected from 1 to 10, indicating that t is any integer selected from the group of integers consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10. In addition, when multiple ranges are provided to describe features or characteristics, these ranges can be merged. In other words, unless otherwise specified, the ranges disclosed herein should be understood to include any and all subranges included therein.

[0056] Unless otherwise specified, the temperature parameters in this application allow for both constant temperature treatment and temperature fluctuations within a certain temperature range. It should be understood that the constant temperature treatment allows for temperature fluctuations within the accuracy range of instrument control. Fluctuations within ranges such as ±5°C, ±4°C, ±3°C, ±2°C, and ±1°C are permitted.

[0057] In this application, % (w / w) and wt% both refer to weight percentage, % (v / v) refers to volume percentage, and % (w / v) refers to mass volume percentage.

[0058] The "room temperature" in this application generally refers to 5°C to 30°C, preferably 25±5°C.

[0059] In this application, the "Mooney viscosity" of rubber refers to the shear viscosity value of the rubber material measured at 100°C, preheated for 1 minute, and tested for 4 minutes using a Mooney viscometer, expressed as ML(1+4)100°C. The detection method is as follows: According to the national standard GBT1232.1, a circular film with a diameter range of 50mm and a thickness of 6mm is taken, and the amount of film fills the entire mold cavity. Open the instrument mold cavity, take out the rotor, insert a film into the rotor, put the rotor with the film into the viscosity agent mold cavity, and then place another film on the rotor, and quickly close the mold cavity. After closing the mold cavity, quickly and promptly preheat the rubber material for 1 minute, rotate the rotor, and conduct the test at a temperature range of 100.0℃±0.5℃ for 4 minutes.

[0060] In this application, the "cis content" of rubber refers to the percentage of cis-1,4 polybutadiene structural units in the rubber molecular chain to the total structural units. The detection method is as follows: select a cis-1,4 polybutadiene rubber sheet with a flat, clean surface and no impurities or contamination, with a thickness of about 2mm-3mm. Use Fourier transform infrared spectrometer for detection, select the ATR mode of the instrument, place the sample to be tested on the diamond of the ATR instrument and screw on the dynamometer, the pressure is (50-60), and the scanning parameter is set to 4000cm -1 -667cm -1 , record the reflectance spectrum. Compare the characteristic absorption peak areas of the cis and trans forms, and calculate the cis and trans contents using the butyl rubber calculation formula.

[0061] In this application, the "volatile matter" of rubber refers to the percentage loss in mass of volatile matter (including water, etc.) in a rubber sample when heated to constant weight at 105°C ± 5°C. Testing is performed using the hot roller method in accordance with national standard GB / T 24131.1: The test sample is homogenized on a laboratory open mill, ensuring that no residue remains on the surface or underside of the rollers. Weigh 200±10g of the sample to the nearest 0.1g. Adjust the roller spacing to 0.30±0.05mm and maintain the roller surface temperature at 105°C ± 5°C. Pass the sample through the rollers 12 times and weigh to the nearest 0.1g. Pass the sample through the rollers at least twice more and weigh again. If the difference in mass before and after passing the sample through the rollers is less than 0.1g, the sample is considered completely dry. Otherwise, continue passing the sample through the rollers twice until the difference between the two consecutive weighings is less than 0.1g.

[0062] In this application, the "ash content" of rubber refers to the percentage of inorganic matter remaining after calcination at 550°C ± 25°C relative to the original sample mass. Testing is conducted in accordance with GB / T 4498 and is as follows: Heat a clean, appropriately sized, empty crucible in a muffle furnace at 550°C ± 25°C for approximately 30 minutes. Remove the crucible and cool it to room temperature in a desiccator. Weigh it to the nearest 0.1 mg. Based on the estimated ash content, weigh approximately 5g of the raw rubber sample to the nearest 0.1 mg and cut it into pellets no larger than 5mm. Place the sample in the crucible on a heat-resistant insulation board. Slowly heat the crucible in a controlled electric furnace in a ventilated environment to decompose and carbonize the rubber. Then gradually increase the temperature until the volatile decomposition products are expelled, leaving a dry, chemical residue. Transfer the crucible containing the residue to a muffle furnace at 550°C ± 25°C. After heating for 1 hour, slightly open the furnace door to allow sufficient air to oxidize the residue. Continue heating until the carbonized residue turns to ash. Remove the crucible from the furnace, cool it to room temperature in a desiccator, and weigh it to the nearest 0.1 mg. Heat the crucible again in a muffle furnace at 550°C ± 25°C for approximately 30 minutes. Remove it and cool it to room temperature in a desiccator, then weigh it again to the nearest 0.1 mg. For raw rubber, the difference between the two masses should not exceed 1 mg to indicate a constant mass.

[0063] The core of a golf ball is a key component that determines its flight performance, and its performance directly impacts its overall performance. Conventional golf ball cores suffer from significant deficiencies in compression, resilience, and impact resistance, hindering overall performance improvements. Existing core materials often struggle to maintain ideal elastic deformation under high impact, resulting in inefficient energy transfer during impact, impacting distance and accuracy. Especially during high-speed swings, the core's insufficient compression response prevents it from effectively storing and releasing energy, leading to an unstable trajectory. Conventional core materials have a low coefficient of resiliency, preventing them from quickly recovering after impact, reducing initial velocity and flight distance. This lack of resilience is particularly pronounced during long-distance golf shots, limiting performance. Regarding impact resistance, existing core materials are prone to fatigue damage over long periods of use, leading to a gradual decline in performance. Frequent impacts can cause microcracks or deformation in the core structure, further impacting the ball's compression and resilience, shortening its lifespan.

[0064] In some embodiments, a rubber composition is provided, comprising, by weight, 30 to 80 parts of neodymium rare earth butadiene rubber, 10 to 70 parts of a functional additive, 4 to 30 parts of a filler, and 0.1 to 13 parts of a peroxide.

[0065] The number average molecular weight of the neodymium-based rare earth butadiene rubber is 90 kDa to 100 kDa, and the molecular weight distribution index is 2.6 to 2.74.

[0066] It can be understood that, by weight, 30 to 80 parts of neodymium-based rare earth butadiene rubber means that the weight parts of neodymium-based rare earth butadiene rubber can be, for example, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, etc., or a range consisting of any two of the aforementioned values.

[0067] It can be understood that, in terms of weight, 10 to 70 parts of functional additives means that the weight parts of the functional additives can be, for example, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, etc., or a range consisting of any two of the aforementioned values.

[0068] It can be understood that, by weight, 4 to 30 parts of filler means that the weight of the filler can be, for example, 4 parts, 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, etc., or a range consisting of any two of the aforementioned values.

[0069] It can be understood that, by weight, 0.1 to 13 parts of peroxide means that the weight parts of peroxide can be, for example, 0.1 part, 1 part, 3 parts, 5 parts, 8 parts, 10 parts, 13 parts, etc., or a range consisting of any two of the foregoing values.

[0070] In some embodiments, the provided rubber composition includes, by weight, 55 to 65 parts of neodymium-based rare earth butadiene rubber, 15 to 30 parts of functional additives, 5 to 10 parts of fillers, and 1 to 5 parts of peroxide.

[0071] In some embodiments, in the provided rubber composition, the Mooney viscosity of the neodymium rare earth butadiene rubber can be 48MU~60MU, or can be 50MU~55MU, for example, 48MU, 49MU, 50MU, 51MU, 52MU, 53MU, 54MU, 55MU, 56MU, 57MU, 58MU, 59MU, 60MU, etc., or a range consisting of any two of the foregoing values.

[0072] In some embodiments, in the provided rubber composition, the cis content of the neodymium-based rare earth butadiene rubber is greater than or equal to 97%, and the cis content of the neodymium-based rare earth butadiene rubber is 97% to 98%.

[0073] In some embodiments, in the provided rubber composition, the volatile matter content of the neodymium-based rare earth butadiene rubber is less than or equal to 0.75 wt %, and the volatile matter content of the neodymium-based rare earth butadiene rubber is less than or equal to 0.30 wt %.

[0074] In some embodiments, in the provided rubber composition, the ash content of the neodymium-based rare earth butadiene rubber is less than or equal to 0.30 wt %, and the ash content of the neodymium-based rare earth butadiene rubber is 0.12 wt % to 0.15 wt %.

[0075] In some embodiments, in the provided rubber composition, the weight-average molecular weight of the neodymium-based rare earth butadiene rubber can be 260 kDa to 270 kDa, or 267 kDa to 269.9 kDa, for example, 260 kDa, 261 kDa, 262 kDa, 263 kDa, 264 kDa, 265 kDa, 266 kDa, 267 kDa, 268 kDa, 269 kDa, 270 kDa, etc., or a range consisting of any two of the foregoing values.

[0076] In some embodiments, in the provided rubber composition, the number average molecular weight of the neodymium-based rare earth butadiene rubber can be 90 kDa to 100 kDa, or can be 97.6 kDa to 98.9 kDa, for example, 90 kDa, 91 kDa, 92 kDa, 93 kDa, 94 kDa, 95 kDa, 96 kDa, 97 kDa, 98 kDa, 99 kDa, 100 kDa, etc., or a range consisting of any two of the foregoing values.

[0077] In some embodiments, in the provided rubber composition, the molecular weight distribution index of the neodymium rare earth butadiene rubber can be 2.6 to 2.74, or can be 2.73 to 2.74, for example, 2.6, 2.61, 2.62, 2.63, 2.64, 2.65, 2.66, 2.67, 2.68, 2.69, 2.7, 2.71, 2.72, 2.73, 2.74, etc., or a range consisting of any two of the foregoing values.

[0078] In some embodiments, in the provided rubber composition, the functional additive includes one or more of zinc acrylate, triallyl isocyanurate, zinc oxide, and zinc stearate.

[0079] In some embodiments, in the provided rubber composition, the filler includes one or more of calcium carbonate, calcium stearate, calcium hydroxide, titanium dioxide, and diatomaceous earth.

[0080] In some embodiments, in the provided rubber composition, the peroxide includes one or more of dicumyl peroxide, di-tert-butyl peroxide, dibenzoyl peroxide, 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane, and 2,5-dimethyl-2,5-di-tert-butylperoxyhexane.

[0081] In some embodiments, use of a rubber composition in preparing a golf ball core is provided.

[0082] In some embodiments, a golf ball core is provided. Raw materials for preparing the golf ball core include a rubber composition.

[0083] In some embodiments, a method for preparing a golf ball core is provided, comprising the following steps:

[0084] Performing a first mastication on the neodymium rare earth butadiene rubber to obtain a first masterbatch;

[0085] The first masterbatch is mixed with a functional additive and a filler, and subjected to a first mixing process to obtain a second masterbatch;

[0086] The second masterbatch is mixed with peroxide and subjected to a second mixing process to obtain a third masterbatch;

[0087] The third masterbatch is subjected to a second mastication to obtain a rubber compound;

[0088] vulcanizing the rubber mix to prepare a golf ball core;

[0089] The raw materials for preparing the golf ball core include, by weight, 30 to 80 parts of neodymium rare earth butadiene rubber, 10 to 70 parts of functional additives, 4 to 30 parts of fillers, and 0.1 to 13 parts of peroxide.

[0090] The number average molecular weight of the neodymium-based rare earth butadiene rubber is 90 kDa to 100 kDa, and the molecular weight distribution index is 2.6 to 2.74.

[0091] In some embodiments, in the method for preparing a golf ball core, the temperature of the first mastication is 60° C. to 70° C., and the time of the first mastication is 40 seconds to 80 seconds.

[0092] In some embodiments, in the method for preparing a golf ball core, the first mixing temperature is 60° C. to 70° C., and the first mixing time is 100 s to 150 s.

[0093] In some embodiments, in the method for preparing a golf ball core, the second mixing temperature is 60° C. to 70° C., and the second mixing time is 70 seconds to 100 seconds.

[0094] In some embodiments, in the method for preparing a golf ball core, the temperature of the second mastication is 60° C. to 70° C., and the time of the second mastication is 40 seconds to 80 seconds.

[0095] In some embodiments, in the method for preparing a golf ball core, the vulcanization temperature is 100° C. to 200° C., and the vulcanization time is 400 s to 800 s.

[0096] The embodiments of the present application will be described in detail below in conjunction with some examples. It should be understood that these examples are only used to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which the conditions are not specified in the following examples are preferably referred to the guidance provided in the present application, and can also be based on the experimental manuals or conventional conditions in this area, or according to the conditions recommended by the manufacturer, or with reference to experimental methods known in the art.

[0097] The following are specific examples, which describe the contents disclosed in this application in more detail. These examples are only for illustrative purposes, as it will be apparent to those skilled in the art that various modifications and variations within the scope of the disclosure of this application will be apparent. Unless otherwise stated, all parts, percentages, and ratios reported in the following examples are by weight, and all reagents used in the examples are commercially available or synthesized according to conventional methods and can be used directly without further processing, and the instruments used in the examples are commercially available. Unless otherwise specified, the raw materials used in the following tests are all commercially available. Neodymium rare earth butadiene rubber TF05G was purchased from Zhejiang Chuanhua Synthetic Materials Co., Ltd. Neodymium rare earth butadiene rubber A was purchased from Kumho Rubber of South Korea with a product model of BR050.

[0098] 1. Preparation of Golf Ball Core

[0099] 1. Formula composition

[0100] The formulations of the examples and comparative examples are shown in Table 1.

[0101] Table 1

[0102]

[0103] The parameters of Nd-containing rare earth butadiene rubber TF05G, Nd-containing rare earth butadiene rubber A, and Nd-containing rare earth butadiene rubber B are shown in Table 2.

[0104] Table 2

[0105]

[0106] 2. Preparation Method

[0107] During the golf ball production process, an internal mixer is required for mixing operations. The mixer temperature is controlled at 60°C and the speed is 60r / min. First, the neodymium-based rare earth butadiene rubber TF05G is placed in the internal mixer chamber for plastication for 60 seconds. After adding functional additives and fillers, the mixture is mixed for 120 seconds. Peroxide is then added and mixed for 80 seconds. The rubber is then discharged to a two-roll open mill for cooling and sheeting, and placed in a constant temperature and humidity chamber for 8 hours. After standing and passing the inspection, the mixed rubber is placed in a two-roll open mill and plasticated for 60 seconds. The plasticized rubber mixture is then placed in an extruder and extruded into rubber strips of fixed size and weight. The rubber strips are placed in a flat vulcanizer at a temperature of 160°C and a vulcanization time of 600 seconds. After vulcanization, the flash is cleaned to obtain the golf ball core.

[0108] 2. Performance Testing

[0109] The following methods were used to test the compression performance, rebound performance, and impact resistance of the golf ball cores obtained in Examples 1 to 2 and Comparative Example 1.

[0110] Compression Performance: The compression performance of the golf ball core is tested using an Instron universal tensile testing machine. Confirm the material tensile testing machine and the custom compression fixture (19mm diameter flat compression disc and flat compression plate). Place the golf ball core on top of the compression plate, ensuring maximum surface contact. Confirm that the compression plate is lowered at a speed of 20 inches / minute. Record the "touch": the initial contact between the plate and the top of the golf ball core, and the system begins measuring from zero. The compression plate continues to apply a load with a maximum force of 200N, and then pauses for 2 seconds. Take two measurements, one at 200N and one 2 seconds after the load is removed, to measure the compression performance of the golf ball core.

[0111] Rebound Performance: Golf ball cores were tested for rebound performance using a bombardment tester from Dongguan Lizhijing Electronic Technology Co., Ltd. Six golf ball cores were placed in designated locations on the instrument. The instrument was activated and tested at an initial velocity of 125 ± 10 ft / s. The rebound height or coefficient of rebound of the cores was recorded to determine the golf ball core's rebound performance.

[0112] Impact resistance: Golf ball cores were tested using a ball impact tester from Dongguan Lizhijing Electronic Technology Co., Ltd. Six golf ball cores were placed in designated locations on the tester. The ball impact tester was set to a speed of 350 ft / s and struck 50 times. Any damage or deformation after each impact was recorded.

[0113] The test results are shown in Table 3 below.

[0114] Table 3

[0115] project Example 1 Example 2 Comparative Example 1 Compression performance 25 25 17 Rebound performance 0.780 0.750 0.550 Impact resistance All 6 are intact All 6 are intact 6 broken 3

[0116] The results shown in Table 3 indicate that the provided golf ball core has low compression performance, high resilience performance and impact resistance, and the golf ball produced has high comfort.

[0117] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0118] The above-described embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims, and the specification shall serve to interpret the content of the claims.

Claims

1. A rubber composition, characterized in that Calculated by weight, it comprises 30 to 80 parts of neodymium rare earth butadiene rubber, 10 to 70 parts of functional additives, 4 to 30 parts of fillers and 0.1 to 13 parts of peroxide; The number average molecular weight of the neodymium-based rare earth butadiene rubber is 90 kDa to 100 kDa, and the molecular weight distribution index is 2.6 to 2.

74.

2. The rubber composition according to claim 1, wherein Calculated by weight, the invention comprises 55 to 65 parts of neodymium rare earth butadiene rubber, 15 to 30 parts of functional additives, 5 to 10 parts of fillers and 1 to 5 parts of peroxide.

3. The rubber composition according to claim 1, characterized in that The neodymium rare earth butadiene rubber meets one or more of the following conditions: (1) The Mooney viscosity of the neodymium rare earth butadiene rubber is 48MU to 60MU; (2) The cis content of the neodymium-based rare earth butadiene rubber is greater than or equal to 97%; (3) The volatile matter content of the neodymium rare earth butadiene rubber is less than or equal to 0.75 wt %; (4) the ash content of the neodymium rare earth butadiene rubber is less than or equal to 0.30 wt %; and (5) The weight average molecular weight of the neodymium-based rare earth butadiene rubber is 260 kDa to 270 kDa.

4. The rubber composition according to claim 3, characterized in that The neodymium rare earth butadiene rubber meets one or more of the following conditions: (1) The number average molecular weight of the neodymium rare earth butadiene rubber is 97.6 kDa to 98.9 kDa; (2) The weight average molecular weight of the neodymium rare earth butadiene rubber is 267 kDa to 269.9 kDa; (3) The molecular weight distribution index of the neodymium rare earth butadiene rubber is 2.73 to 2.74; (4) The Mooney viscosity of the neodymium rare earth butadiene rubber is 50MU to 55MU; (5) The cis content of the neodymium rare earth butadiene rubber is 97% to 98%; (6) The volatile matter content of the neodymium rare earth butadiene rubber is less than or equal to 0.30 wt %; and (7) The ash content of the neodymium-based rare earth butadiene rubber is 0.12 wt% to 0.15 wt%.

5. The rubber composition according to claim 1, wherein One or more of the following conditions are met: (1) The functional additive includes one or more of zinc acrylate, triallyl isocyanurate, zinc oxide, and zinc stearate; and (2) The filler includes one or more of calcium carbonate, calcium stearate, calcium hydroxide, titanium dioxide, and diatomaceous earth.

6. The rubber composition according to any one of claims 1 to 5, characterized in that The peroxide includes one or more of dicumyl peroxide, di-tert-butyl peroxide, dibenzoyl peroxide, 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane, and 2,5-dimethyl-2,5-di-tert-butylperoxyhexane.

7. Use of the rubber composition according to any one of claims 1 to 6 in preparing a golf ball core.

8. A golf ball core, characterized in that: The raw materials for preparing the golf ball core include the rubber composition according to any one of claims 1 to 6.

9. A method for preparing a golf ball core, characterized in that: The steps include: Performing a first mastication on the neodymium rare earth butadiene rubber to obtain a first masterbatch; The first masterbatch is mixed with a functional additive and a filler, and subjected to a first mixing process to obtain a second masterbatch; mixing the second masterbatch with peroxide and performing a second mixing to obtain a third masterbatch; The third masterbatch is subjected to a second mastication to obtain a rubber compound; vulcanizing the rubber mix to prepare the golf ball core; The raw materials for preparing the golf ball core include, by weight, 30 to 80 parts of neodymium rare earth butadiene rubber, 10 to 70 parts of functional additives, 4 to 30 parts of fillers, and 0.1 to 13 parts of peroxide. The number average molecular weight of the neodymium-based rare earth butadiene rubber is 90 kDa to 100 kDa, and the molecular weight distribution index is 2.6 to 2.

74.

10. The preparation method according to claim 9, characterized in that One or more of the following conditions are met: (1) The temperature of the first mastication is 60°C to 70°C, and the time of the first mastication is 40s to 80s; (2) The temperature of the first mixing is 60° C. to 70° C., and the time of the first mixing is 100 s to 150 s; (3) The temperature of the second mixing is 60°C to 70°C, and the time of the second mixing is 70s to 100s; (4) the temperature of the second mastication is 60° C. to 70° C., and the time of the second mastication is 40 seconds to 80 seconds; and (5) The vulcanization temperature is 100℃~200℃, and the vulcanization time is 400s~800s.

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