A ball skin with good air tightness and a preparation method thereof

Abstract

The application relates to a ball skin with good air tightness and a preparation method thereof. A ball skin material for manufacturing the ball skin comprises the following components in proportion by weight parts: base rubber, sulfur masterbatch, M-80 medicine rubber, CZ-80 medicine rubber and anti-bloom agent; wherein the base rubber comprises the following components in proportion by weight parts: 20-28 parts of natural rubber, 5-10 parts of butadiene styrene rubber SBR1502, 5-10 parts of brominated butyl rubber, 20-25 parts of calcium carbonate, 5-8 parts of white carbon black, 20-25 parts of magnesia, 0.5-1.2 parts of spindle oil, 1-2 parts of zinc oxide, 0.2-0.5 parts of rubber protective wax, 0.1-0.5 parts of resin, 0.2-0.5 parts of anti-aging agent and 0.1-0.3 parts of rubber active agent. The finished ball manufactured from the ball skin not only has good elasticity, weather resistance and wear resistance, but also has good air tightness and soft texture, and the air tightness of the finished ball is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of sports ball manufacturing and processing, specifically relating to a ball skin with good airtightness and its preparation method. Background Technology

[0002] Ball sports are increasingly popular, especially basketball and soccer, which are becoming more and more common in school sports and are included in corresponding curricula. Taking inflatable basketballs as an example, most basketballs consist of an inner bladder, a yarn layer, a middle layer, and a basketball skin covering the middle layer, as well as a valve. Currently, the airtightness of most basketballs is determined by the inner bladder, which ensures the ball's airtightness. To ensure the finished ball has a suitable weight and bounce, the existing inner bladders are not only lightweight but also have relatively thin walls, generally around 0.7-1.0 mm thick. This results in weak airtightness of the entire inner bladder. Furthermore, the middle layer and the outer skin covering it are not airtight, and the airtightness of the finished ball cannot be improved by either the middle layer or the outer skin. Therefore, the finished ball has poor airtightness. In addition, the outer skin of a ball typically serves to protect the inner core, possessing only basic properties such as good weather resistance, abrasion resistance, and bounce. However, the outer skin properties of existing sports balls, such as basketballs, are still not superior enough. On the one hand, they are not soft enough, making athletes susceptible to injury when hit by the ball. On the other hand, their weather resistance is still relatively poor; with changes in climate and time, basketballs are prone to deformation, and their outer skin is prone to cracking and brittleness. In response, the applicant of this invention filed a patent on December 28, 2019, and it was granted and published on April 1, 2022, concerning a ball outer skin material and its preparation method, patent number ZL 2019 1 1383637.2. The ball outer skin obtained by this patent technology has excellent weather resistance and abrasion resistance. Even with changes in climate and time, the properties of the ball outer skin do not change significantly, making the ball made from this outer skin material less prone to deformation and less susceptible to surface cracking, brittleness, and breakage. Furthermore, this ball outer skin has a soft feel and good bounce and grip. However, like traditional ball skins, this skin lacks airtightness, meaning the resulting ball's airtightness is not improved compared to traditional basketballs, failing to meet the requirements for good airtightness in sports balls. Therefore, the inventors of this invention further researched ball skin materials and developed a new type of skin. Balls made from this skin not only possess good elasticity, weather resistance, and wear resistance, but also excellent airtightness and a soft texture. This allows the finished ball to be protected not only by the inner bladder but also by the outer skin, resulting in a double-layered airtight system that effectively improves the ball's airtightness. Summary of the Invention

[0003] The purpose of this invention is to provide a ball skin with good airtightness and its preparation method. The finished ball made from this ball skin not only has good elasticity, weather resistance, and wear resistance, but also has good airtightness and soft texture, which greatly improves the airtightness of the finished ball.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A ball skin material with good airtightness, comprising the following components in parts by weight: 50-60 parts of main rubber compound, 0.5-1.2 parts of sulfur masterbatch, 0.1-0.3 parts of M-80 adhesive, 0.2-0.5 parts of CZ-80 adhesive, and 0.15-0.5 parts of anti-blooming agent;

[0006] The main rubber compound comprises the following components in parts by weight:

[0007] Natural rubber 20-28 parts, styrene-butadiene rubber SBR1502 5-10 parts, brominated butyl rubber 5-10 parts, calcium carbonate 20-25 parts, white carbon black 5-8 parts, magnesia 20-25 parts, spindle oil 0.5-1.2 parts, zinc oxide 1-2 parts, rubber protective wax 0.2-0.5 parts, resin 0.1-0.5 parts, antioxidant 0.2-0.5 parts, rubber activator 0.1-0.3 parts.

[0008] The sulfur masterbatch is medicated gum S-80.

[0009] The resin is C9 petroleum resin.

[0010] The rubber protective wax is paraffin wax or microcrystalline wax.

[0011] The rubber activator is DEG or PEG.

[0012] The antioxidant is antioxidant SP. The anti-blooming agent is anti-blooming agent AS-5, rubber anti-blooming agent R-638, rubber anti-blooming agent 7545 and rubber anti-blooming agent 6546 from Shandong Huaen Rubber & Plastic New Material Co., Ltd.

[0013] Preferably, the ball skin material with good airtightness comprises the following components in parts by weight: 55 parts of main rubber, 0.9 parts of sulfur masterbatch, 0.18 parts of M-80 adhesive, 0.35 parts of CZ-80 adhesive, and 0.288 parts of anti-blooming agent.

[0014] The main rubber compound comprises the following components in parts by weight:

[0015] Natural rubber 24 parts, styrene-butadiene rubber SBR1502 6.1 parts, brominated butyl rubber 6.14 parts, calcium carbonate 24.6 parts, white carbon black 6.1 parts, magnesia 21.5 parts, spindle oil 0.92 parts, zinc oxide 1.54 parts, rubber protective wax 0.461 parts, resin 0.307 parts, antioxidant 0.461 parts, rubber activator 0.23 parts.

[0016] A spherical skin with good airtightness, made from the aforementioned spherical skin material.

[0017] The method for preparing the spherical skin includes the following process steps:

[0018] (1) Preparation of main rubber compound: The natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed in proportion are added to the internal mixer and mixed. Then, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added and mixed to obtain the main rubber compound.

[0019] (2) Preparation of ball skin material: The main rubber, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed to obtain the ball skin material.

[0020] (3) The ball skin material obtained in step (2) is extruded and calendered to a thickness of 1.5-2.5 mm, and then cut to obtain the ball skin.

[0021] The specific preparation method of step (1) is as follows: weigh the natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber according to the proportion and add them to the internal mixer for mixing. The internal mixer is set at 120-130℃. After mixing for 100-200s, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added. After mixing for 300-350s, the material is discharged to obtain the main rubber compound.

[0022] The specific preparation method of step (2) is as follows: the main rubber material, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed at 90-95℃ for 600-800s to obtain the ball skin material.

[0023] Compared with the prior art, the advantages of the present invention are as follows:

[0024] 1. This invention uses natural rubber, butadiene rubber, brominated butyl rubber, and other components to prepare a main rubber compound. This main rubber compound, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber, and anti-blooming agent are then mixed to obtain the ball skin material. This ball skin material is extruded and calendered to a thickness of 1.5-2.5 mm. This ball skin has good airtightness, so that the airtightness of the finished ball is protected not only by the inner liner but also by the ball skin. The entire finished ball has two layers of skin for airtightness protection, effectively improving the airtightness of the ball.

[0025] 2. The ball skin made from this material also possesses similar properties to the ball skin disclosed in patent 201911383637.2, exhibiting excellent weather resistance and abrasion resistance. Even with changes in climate and time, the properties of the ball skin do not change significantly, making balls made from this material less prone to deformation and less susceptible to surface cracking, brittleness, and breakage. Balls made from the ball skin material of this invention have the same bounce and grip as traditional balls. The ball skin made from the ball skin material of this invention has a soft texture and good flexibility and impact resistance. It is evident that the ball skin of this invention, in addition to good airtightness, also possesses good elasticity, weather resistance, and abrasion resistance, properties that reach or even surpass those of competition-grade balls. The addition of airtightness does not affect other properties of the ball skin. This ball skin integrates good airtightness, weather resistance, abrasion resistance, elasticity, and softness. Attached Figure Description

[0026] Figure 1 The image shows a photograph of the basketball skin after aging in Example 7; where A is the basketball skin obtained in Example 2, and B is the basketball skin of a conventional rubber vulcanized basketball. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0028] A ball skin material with good airtightness, comprising the following components in parts by weight: 50-60 parts of main rubber compound, 0.5-1.2 parts of sulfur masterbatch, 0.1-0.3 parts of M-80 adhesive, 0.2-0.5 parts of CZ-80 adhesive, and 0.15-0.5 parts of anti-blooming agent;

[0029] The main rubber compound comprises the following components in parts by weight:

[0030] Natural rubber 20-28 parts, styrene-butadiene rubber SBR1502 5-10 parts, brominated butyl rubber 5-10 parts, calcium carbonate 20-25 parts, white carbon black 5-8 parts, magnesia 20-25 parts, spindle oil 0.5-1.2 parts, zinc oxide 1-2 parts, rubber protective wax 0.2-0.5 parts, resin 0.1-0.5 parts, antioxidant 0.2-0.5 parts, rubber activator 0.1-0.3 parts.

[0031] The sulfur masterbatch is medicated gum S-80.

[0032] The resin is C9 petroleum resin.

[0033] The rubber protective wax is paraffin wax or microcrystalline wax.

[0034] The rubber activator is DEG or PEG.

[0035] The antioxidant is antioxidant SP. The anti-blooming agent is anti-blooming agent AS-5, rubber anti-blooming agent R-638, rubber anti-blooming agent 7545 and rubber anti-blooming agent 6546 from Shandong Huaen Rubber & Plastic New Material Co., Ltd.

[0036] A spherical skin with good airtightness is made from the aforementioned spherical skin material. Compared with traditional spherical skins, this spherical skin has better airtightness and weather resistance.

[0037] The ball's outer surface includes, but is not limited to, basketball outer surface, volleyball outer surface, football outer surface, and rugby outer surface.

[0038] The method for preparing the spherical skin includes the following process steps:

[0039] (1) Preparation of main rubber compound: The natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed in proportion are added to the internal mixer and mixed. Then, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added and mixed to obtain the main rubber compound.

[0040] (2) Preparation of ball skin material: The main rubber, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed to obtain the ball skin material.

[0041] (3) The ball skin material obtained in step (2) is extruded and calendered to a thickness of 1.5-2.5 mm, and then cut to obtain the ball skin.

[0042] The specific preparation method of step (1) is as follows: natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed according to the proportion are added to a mixer and mixed. The temperature of the mixer is set to 120-130℃. After mixing for 100-200s, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added. After mixing for 300-350s, the material is discharged to obtain the main rubber compound.

[0043] The specific preparation method of step (2) is as follows: the main rubber material, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed at 90-95℃ for 600-800s to obtain the ball skin material.

[0044] The present invention will be described in more detail below with reference to specific embodiments. Embodiments 1 to 6 describe basketball (rubber vulcanized basketball) outer skin materials and their preparation methods, while Embodiment 10 describes rugby ball outer skin materials and their preparation methods.

[0045] Example 1:

[0046] A basketball outer material with good airtightness comprises the following components: 50 kg of main rubber compound, 1.2 kg of sulfur masterbatch, 0.1 kg of M-80 adhesive, 0.5 kg of CZ-80 adhesive, and 0.15 kg of anti-blooming agent;

[0047] The main rubber compound comprises the following components in parts by weight:

[0048] 20 parts natural rubber, 10 parts styrene-butadiene rubber SBR1502, 5 parts brominated butyl rubber, 25 parts calcium carbonate, 5 parts silica, 25 parts magnesia, 0.5 parts spindle oil, 2 parts zinc oxide, 0.2 parts rubber protective wax, 0.5 parts resin, 0.2 parts antioxidant, and 0.3 parts rubber activator.

[0049] The sulfur masterbatch is medicated gum S-80.

[0050] The resin is C9 petroleum resin.

[0051] The rubber protective wax is a microcrystalline wax.

[0052] The rubber activator is DEG.

[0053] The antioxidant is antioxidant SP. The anti-blooming agent is anti-blooming agent AS-5.

[0054] A basketball skin with good airtightness, made from the aforementioned basketball skin material.

[0055] The method for preparing the basketball outer skin includes the following process steps:

[0056] (1) Preparation of main rubber compound: The natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed in proportion are added to the internal mixer and mixed. Then, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added and mixed to obtain the main rubber compound.

[0057] (2) Preparation of basketball skin material: The main rubber, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed to obtain basketball skin material.

[0058] (3) The basketball skin material obtained in step (2) is extruded and calendered to a thickness of 2 mm, and then cut to obtain the basketball skin.

[0059] The specific preparation method of step (1) is as follows: natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed according to the proportion are added to a mixer and mixed. The temperature of the mixer is set to 120°C. After mixing for 200s, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added. After mixing for another 300s, the material is discharged to obtain the main rubber compound.

[0060] The specific preparation method of step (2) is as follows: the main rubber, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed at 90°C for 800s to obtain the basketball skin material.

[0061] Example 2:

[0062] A basketball outer material with good airtightness comprises the following components: 55 kg of main rubber compound, 0.9 kg of sulfur masterbatch, 0.18 kg of M-80 adhesive, 0.35 kg of CZ-80 adhesive, and 0.288 kg of anti-blooming agent;

[0063] The main rubber compound comprises the following components in parts by weight:

[0064] Natural rubber 24 parts, styrene-butadiene rubber SBR1502 6.1 parts, brominated butyl rubber 6.14 parts, calcium carbonate 24.6 parts, white carbon black 6.1 parts, magnesia 21.5 parts, spindle oil 0.92 parts, zinc oxide 1.54 parts, rubber protective wax 0.461 parts, resin 0.307 parts, antioxidant 0.461 parts, rubber activator 0.23 parts.

[0065] The sulfur masterbatch is medicated gum S-80.

[0066] The resin is C9 petroleum resin.

[0067] The rubber protective wax is a microcrystalline wax.

[0068] The rubber activator is DEG.

[0069] The antioxidant is antioxidant SP. The anti-blooming agent is anti-blooming agent AS-5.

[0070] A basketball skin with good airtightness, made from the aforementioned basketball skin material.

[0071] The method for preparing the basketball outer skin includes the following process steps:

[0072] (1) Preparation of main rubber compound: The natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed in proportion are added to the internal mixer and mixed. Then, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added and mixed to obtain the main rubber compound.

[0073] (2) Preparation of basketball skin material: The main rubber, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed to obtain basketball skin material.

[0074] (3) The basketball skin material obtained in step (2) is extruded and calendered to a thickness of 2 mm, and then cut to obtain the basketball skin.

[0075] The specific preparation method of step (1) is as follows: natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed according to the proportion are added to a mixer and mixed. The temperature of the mixer is set to 120°C. After mixing for 200s, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added. After mixing for another 300s, the material is discharged to obtain the main rubber compound.

[0076] The specific preparation method of step (2) is as follows: the main rubber, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed at 90°C for 800s to obtain the basketball skin material.

[0077] Example 3:

[0078] A basketball outer material with good airtightness comprises the following components: 55 kg of main rubber compound, 0.9 kg of sulfur masterbatch, 0.18 kg of M-80 adhesive, 0.35 kg of CZ-80 adhesive, and 0.288 kg of anti-blooming agent;

[0079] The main rubber compound comprises the following components in parts by weight:

[0080] Natural rubber 24 parts, styrene-butadiene rubber SBR1502 6.1 parts, brominated butyl rubber 6.14 parts, calcium carbonate 24.6 parts, white carbon black 6.1 parts, magnesia 21.5 parts, spindle oil 0.92 parts, zinc oxide 1.54 parts, rubber protective wax 0.461 parts, resin 0.307 parts, antioxidant 0.461 parts, rubber activator 0.23 parts.

[0081] The sulfur masterbatch is medicated gum S-80.

[0082] The resin is C9 petroleum resin.

[0083] The rubber protective wax is a microcrystalline wax.

[0084] The rubber activator is DEG.

[0085] The antioxidant is antioxidant SP. The anti-blooming agent is anti-blooming agent AS-5.

[0086] A basketball skin with good airtightness, made from the aforementioned basketball skin material.

[0087] The method for preparing the basketball outer skin includes the following process steps:

[0088] (1) Preparation of main rubber compound: The natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed in proportion are added to the internal mixer and mixed. Then, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added and mixed to obtain the main rubber compound.

[0089] (2) Preparation of basketball skin material: The main rubber, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed to obtain basketball skin material.

[0090] (3) The basketball skin material obtained in step (2) is extruded and calendered to a thickness of 2 mm, and then cut to obtain the basketball skin.

[0091] The specific preparation method of step (1) is as follows: natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed according to the proportion are added to a mixer and mixed. The temperature of the mixer is set to 125°C. After mixing for 150s, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added. After mixing for another 320s, the material is discharged to obtain the main rubber compound.

[0092] The specific preparation method of step (2) is as follows: the main rubber material, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed at 93°C for 750s to obtain the basketball skin material.

[0093] Example 4:

[0094] A basketball outer material with good airtightness comprises the following components: 55 kg of main rubber compound, 0.9 kg of sulfur masterbatch, 0.18 kg of M-80 adhesive, 0.35 kg of CZ-80 adhesive, and 0.288 kg of anti-blooming agent;

[0095] The main rubber compound comprises the following components in parts by weight:

[0096] Natural rubber 24 parts, styrene-butadiene rubber SBR1502 6.1 parts, brominated butyl rubber 6.14 parts, calcium carbonate 24.6 parts, white carbon black 6.1 parts, magnesia 21.5 parts, spindle oil 0.92 parts, zinc oxide 1.54 parts, rubber protective wax 0.461 parts, resin 0.307 parts, antioxidant 0.461 parts, rubber activator 0.23 parts.

[0097] The sulfur masterbatch is medicated gum S-80.

[0098] The resin is C9 petroleum resin.

[0099] The rubber protective wax is a microcrystalline wax.

[0100] The rubber activator is DEG.

[0101] The antioxidant is antioxidant SP. The anti-blooming agent is anti-blooming agent AS-5.

[0102] A basketball skin with good airtightness, made from the aforementioned basketball skin material.

[0103] The method for preparing the basketball outer skin includes the following process steps:

[0104] (1) Preparation of main rubber compound: The natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed in proportion are added to the internal mixer and mixed. Then, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added and mixed to obtain the main rubber compound.

[0105] (2) Preparation of basketball skin material: The main rubber, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed to obtain basketball skin material.

[0106] (3) The basketball skin material obtained in step (2) is extruded and calendered to a thickness of 2 mm, and then cut to obtain the basketball skin.

[0107] The specific preparation method of step (1) is as follows: natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed in proportion are added to a mixer and mixed. The temperature of the mixer is set at 130°C. After mixing for 100s, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added. After mixing for another 350s, the material is discharged to obtain the main rubber compound.

[0108] The specific preparation method of step (2) is as follows: the main rubber, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed at 95°C for 600s to obtain the basketball skin material.

[0109] Example 5:

[0110] A basketball outer material with good airtightness comprises the following components: 55 kg of main rubber compound, 0.9 kg of sulfur masterbatch, 0.18 kg of M-80 adhesive, 0.35 kg of CZ-80 adhesive, and 0.288 kg of anti-blooming agent;

[0111] The main rubber compound comprises the following components in parts by weight:

[0112] Natural rubber 24 parts, styrene-butadiene rubber SBR1502 6.1 parts, brominated butyl rubber 6.14 parts, calcium carbonate 24.6 parts, white carbon black 6.1 parts, magnesia 21.5 parts, spindle oil 0.92 parts, zinc oxide 1.54 parts, rubber protective wax 0.461 parts, resin 0.307 parts, antioxidant 0.461 parts, rubber activator 0.23 parts.

[0113] The sulfur masterbatch is medicated gum S-80.

[0114] The resin is C9 petroleum resin.

[0115] The rubber protective wax is paraffin wax.

[0116] The rubber activator is PEG.

[0117] The antioxidant is antioxidant SP. The anti-blooming agent is anti-blooming agent AS-5.

[0118] A basketball skin with good airtightness, made from the aforementioned basketball skin material.

[0119] The method for preparing the basketball outer skin includes the following process steps:

[0120] (1) Preparation of main rubber compound: The natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed in proportion are added to the internal mixer and mixed. Then, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added and mixed to obtain the main rubber compound.

[0121] (2) Preparation of basketball skin material: The main rubber, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed to obtain basketball skin material.

[0122] (3) The basketball skin material obtained in step (2) is extruded and calendered to a thickness of 2 mm, and then cut to obtain the basketball skin.

[0123] The specific preparation method of step (1) is as follows: natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed according to the proportion are added to a mixer and mixed. The temperature of the mixer is set to 120°C. After mixing for 200s, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added. After mixing for another 300s, the material is discharged to obtain the main rubber compound.

[0124] The specific preparation method of step (2) is as follows: the main rubber, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed at 90°C for 800s to obtain the basketball skin material.

[0125] Example 6:

[0126] A basketball outer material with good airtightness comprises the following components: 60 kg of main rubber compound, 0.5 kg of sulfur masterbatch, 0.3 kg of M-80 adhesive, 0.2 kg of CZ-80 adhesive, and 0.5 kg of anti-blooming agent;

[0127] The main rubber compound comprises the following components in parts by weight:

[0128] Natural rubber 28 parts, styrene-butadiene rubber SBR1502 5 parts, brominated butyl rubber 10 parts, calcium carbonate 20 parts, white carbon black 8 parts, magnesia 20 parts, spindle oil 1.2 parts, zinc oxide 1 part, rubber protective wax 0.5 parts, resin 0.1 parts, antioxidant 0.5 parts, rubber activator 0.1 parts.

[0129] The sulfur masterbatch is medicated gum S-80.

[0130] The resin is C9 petroleum resin.

[0131] The rubber protective wax is a microcrystalline wax.

[0132] The rubber activator is DEG.

[0133] The antioxidant is antioxidant SP. The anti-blooming agent is anti-blooming agent AS-5.

[0134] A basketball skin with good airtightness, made from the aforementioned basketball skin material.

[0135] The method for preparing the basketball outer skin includes the following process steps:

[0136] (1) Preparation of main rubber compound: The natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed in proportion are added to the internal mixer and mixed. Then, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added and mixed to obtain the main rubber compound.

[0137] (2) Preparation of basketball skin material: The main rubber, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed to obtain basketball skin material.

[0138] (3) The basketball skin material obtained in step (2) is extruded and calendered to a thickness of 2 mm, and then cut to obtain the basketball skin.

[0139] The specific preparation method of step (1) is as follows: natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed according to the proportion are added to a mixer and mixed. The temperature of the mixer is set to 120°C. After mixing for 200s, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added. After mixing for another 300s, the material is discharged to obtain the main rubber compound.

[0140] The specific preparation method of step (2) is as follows: the main rubber, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed at 90°C for 800s to obtain the basketball skin material.

[0141] Example 7: Physical Property Testing

[0142] The basketball skins prepared in Examples 1 to 6 all exhibit good physical properties. Table 1 shows the aging physical property test data of the basketball skins prepared in Examples 1 to 6, the basketball skin prepared in Example 5 of Patent 201911383637.2 (hereinafter referred to as: comparative basketball skin), and the basketball skin of a conventional rubber vulcanized basketball under aging conditions of 105℃ and 24h.

[0143] Table 1 Aging property test data

[0144]

[0145] As shown in Table 1, the values ​​of elongation at break, tensile strength, and stress at 300% constant elongation of the basketball skin before aging of traditional rubber vulcanized basketballs differ significantly from their corresponding values ​​after aging (e.g., the elongation at break before aging was 746.33%, while the elongation at break after aging was 777.98%, and the tensile strength before aging was 60.78 kg / cm²). 2 However, the tensile strength decreased to 25.11 kg / cm² after aging. 2 This indicates that the weather resistance of the basketball skin of traditional rubber vulcanized basketballs is poor. The 300% tensile stress of the basketball skin of traditional rubber vulcanized basketballs shows that the 300% tensile stress before aging is 11.07 kg / cm². 2 After aging, it decreases even further, to only 6.05 kg / cm². 2 This indicates that the wear resistance of the basketball skin of traditional rubber vulcanized basketballs is also poor.

[0146] The changes in various values ​​of the basketball skin obtained in Examples 1 to 6 of this invention before and after aging are not significant. For example, the basketball skin obtained in Example 2 has an elongation at break of 731.21% before aging and an elongation at break of 736.54% after aging; the tensile strength before aging is 44.57 kg / cm². 2 The tensile strength after aging is 47.31 kg / cm². 2 The changes in values ​​before and after aging were minimal, indicating that the basketball skin obtained by this invention has superior weather resistance compared to the basketball skin of traditional rubber vulcanized basketballs. Furthermore, the 300% tensile stress of the basketball skins obtained in each embodiment before and after aging shows that the basketball skin obtained by this invention has good abrasion resistance compared to the basketball skin of traditional rubber vulcanized basketballs. The weather resistance and abrasion resistance of the basketball skin obtained by this invention are comparable to those of the comparative basketball skin. Additionally, based on photographs of the basketball skin after aging (…),… Figure 1 As can be seen, the basketball skin obtained in Embodiment 2 of the present invention, after aging and bending, has almost no cracks (e.g. Figure 1 As shown in Figure A). However, the surface of a traditional vulcanized rubber basketball becomes covered with cracks after aging and bending (as shown in Figure A). Figure 1 (As shown in B), and tearing occurred at the edges.

[0147] Example 8: Air tightness test

[0148] Basketball finished products were made by wrapping the outer skin of basketballs obtained in Examples 1 to 6 of this invention and the outer skin of basketballs obtained in Example 5 of patent ZL201911383637.2 around the outer surface of the same basketball core. The air tightness of these finished basketballs and traditional competition basketballs was tested (the finished basketballs made using the outer skins obtained in Examples 1 to 6 of this invention are numbered "1-6", the finished basketball made using the outer skin of basketballs obtained in Example 5 of patent 201911383637.2 is numbered "7", and the traditional competition basketball is numbered "8"). The testing method involved inflating each basketball to the same initial pressure. Afterwards, the basketballs were left to stand at 25°C, and the air pressure of each basketball was tested every 7 days, with each basketball tested 4 times. The average air pressure was recorded, and the rate of decrease in air pressure on the 7th and 49th days was calculated. Specific test values ​​are shown in Table 2.

[0149] Table 2. Results of airtightness test

[0150]

[0151] As shown in Table 2, the air tightness of the various basketballs was similar on day 7 of the test. However, as time progressed, the finished basketballs made from the basketball skins obtained in Examples 1 to 6 of this application gradually showed their advantage in terms of air tightness. After 49 days, the air pressure drop rate of basketballs size 1-6 was approximately 9.5%, while the air pressure drop rate of basketballs size 7 and 8 was greater than 11%. Therefore, the basketball skin obtained by this invention has good air tightness, providing a second air tightness protection barrier for the finished basketball and improving the overall air tightness of the finished basketball.

[0152] Example 9: Testing the Bouncing Performance and Impact Resistance of Finished Basketballs

[0153] Basketball finished products were made by wrapping the basketball outer skins obtained in Examples 1 to 6 of this invention and the basketball outer skin obtained in Example 5 of patent ZL201911383637.2 around the outer perimeter of the same type of basketball core. The rebound height (mm), number of impacts (times), post-impact expansion rate (%), post-impact deformation value (mm), and post-impact air pressure drop rate (%) of these finished basketballs and existing traditional competition basketballs were tested, as shown in Table 3, reflecting their bounce and impact resistance. The basketballs made using the basketball outer skins obtained in Examples 1 to 6 of this invention are numbered "1-6", the basketball made using the basketball outer skin obtained in Example 5 of patent ZL201911383637.2 is numbered "7", and the traditional competition basketball is numbered "8".

[0154] Table 3 Results of bounce and impact resistance tests

[0155]

[0156] As can be seen from the data in Table 3, the basketball made with the basketball skin obtained by the present invention has reached the level of a competition-grade basketball in terms of bounce performance. In addition, the basketball made with the basketball skin obtained by the present invention has a greater impact resistance than a traditional competition basketball, and the air pressure drop rate after impact is lower than that of a traditional competition basketball. This indicates that the basketball made with the basketball skin obtained by the present invention has excellent impact resistance. It also further shows that the basketball skin made by the present invention has good air tightness, and the air tightness of the basketball remains good even after impact.

[0157] The ball skin material of this invention can be used not only for making basketball skins, but also for making rugby ball, volleyball, and other ball skins. For example:

[0158] Example 10:

[0159] A rugby ball outer skin material with good airtightness comprises the following components: 57 kg of main rubber, 1.0 kg of sulfur masterbatch, 0.15 kg of M-80 medicated rubber, 0.3 kg of CZ-80 medicated rubber, and 0.32 kg of anti-blooming agent;

[0160] The main rubber compound comprises the following components in parts by weight:

[0161] Natural rubber 25 parts, styrene-butadiene rubber SBR1502 7.8 parts, brominated butyl rubber 8.2 parts, calcium carbonate 22.5 parts, white carbon black 6.5 parts, magnesia 22.7 parts, spindle oil 1.15 parts, zinc oxide 1.52 parts, rubber protective wax 0.3 parts, resin 0.27 parts, antioxidant 0.32 parts, rubber activator 0.25 parts.

[0162] The sulfur masterbatch is medicated gum S-80.

[0163] The resin is C9 petroleum resin.

[0164] The rubber protective wax is a microcrystalline wax.

[0165] The rubber activator is DEG.

[0166] The antioxidant is antioxidant SP. The anti-blooming agent is rubber anti-blooming agent R-638.

[0167] A rugby skin with good airtightness, made from the aforementioned rugby skin material.

[0168] The method for preparing the rugby ball skin includes the following process steps:

[0169] (1) Preparation of main rubber compound: The natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed in proportion are added to the internal mixer and mixed. Then, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added and mixed to obtain the main rubber compound.

[0170] (2) Preparation of rugby skin material: The main rubber, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed to obtain rugby skin material;

[0171] (3) The rugby skin material obtained in step (2) is extruded and calendered to a thickness of 2 mm, and then cut to obtain the rugby skin.

[0172] The specific preparation method of step (1) is as follows: natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed according to the proportion are added to a mixer and mixed. The temperature of the mixer is set to 125°C. After mixing for 180s, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added. After mixing for another 320s, the material is discharged to obtain the main rubber compound.

[0173] The specific preparation method of step (2) is as follows: the main rubber, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed at 92°C for 700s to obtain the rugby skin material.

[0174] It should be noted that the above description is only a preferred embodiment of the present invention. For those skilled in the art, several changes, improvements and modifications can be made without departing from the concept of the present invention, and these changes, improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A spherical skin material with good airtightness, characterized in that: It comprises the following components by weight: 50-60 parts of main rubber compound, 0.5-1.2 parts of sulfur masterbatch, 0.1-0.3 parts of M-80 medicated rubber, 0.2-0.5 parts of CZ-80 medicated rubber, and 0.15-0.5 parts of anti-blooming agent; The main rubber compound comprises the following components in parts by weight: Natural rubber 20-28 parts, styrene-butadiene rubber SBR1502 5-10 parts, brominated butyl rubber 5-10 parts, calcium carbonate 20-25 parts, white carbon black 5-8 parts, magnesia 20-25 parts, spindle oil 0.5-1.2 parts, zinc oxide 1-2 parts, rubber protective wax 0.2-0.5 parts, resin 0.1-0.5 parts, antioxidant 0.2-0.5 parts, rubber activator 0.1-0.3 parts; The sulfur masterbatch is medicated gum S-80; The resin is C9 petroleum resin; The rubber protective wax is paraffin wax or microcrystalline wax; The rubber activator is DEG or PEG.

2. The spherical skin material with good airtightness according to claim 1, characterized in that: It comprises the following components by weight: 55 parts main rubber compound, 0.9 parts sulfur masterbatch, 0.18 parts M-80 medicated rubber, 0.35 parts CZ-80 medicated rubber, and 0.288 parts anti-blooming agent; The main rubber compound comprises the following components in parts by weight: Natural rubber 24 parts, styrene-butadiene rubber SBR1502 6.1 parts, brominated butyl rubber 6.14 parts, calcium carbonate 24.6 parts, white carbon black 6.1 parts, magnesia 21.5 parts, spindle oil 0.92 parts, zinc oxide 1.54 parts, rubber protective wax 0.461 parts, resin 0.307 parts, antioxidant 0.461 parts, rubber activator 0.23 parts.

3. A spherical skin with good airtightness made of the spherical skin material according to any one of claims 1-2.

4. A method for preparing the spherical skin as described in claim 3, characterized in that: It includes the following process steps: (1) Preparation of main rubber compound: The natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber weighed in proportion are added to the internal mixer and mixed. Then calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added and mixed to obtain the main rubber compound. (2) Preparation of ball skin material: The main rubber, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed to obtain the ball skin material; (3) The ball skin material obtained in step (2) is extruded and calendered to a thickness of 1.5-2.5 mm, and then cut to obtain the ball skin.

5. The method for preparing the spherical skin according to claim 4, characterized in that: The specific preparation method of step (1) is as follows: weigh the natural rubber, styrene-butadiene rubber SBR1502 and brominated butyl rubber according to the proportion and add them to the internal mixer for mixing. The internal mixer is set to a temperature of 120-130℃. After mixing for 100-200s, calcium carbonate, white carbon black, magnesia, spindle oil, zinc oxide, rubber protective wax, resin, antioxidant and rubber activator are added. After mixing for another 300-350s, the material is discharged to obtain the main rubber compound.

6. The method for preparing the spherical skin according to claim 4, characterized in that: The specific preparation method of step (2) is as follows: the main rubber material, sulfur masterbatch, M-80 medicated rubber, CZ-80 medicated rubber and anti-blooming agent obtained in step (1) are added to the open mill and mixed at 90-95℃ for 600-800s to obtain the ball skin material.

Images