Butyl inner liner PU pasting skin football based on high sealing performance and preparation process thereof

Abstract

The application relates to the technical field of sports goods, and discloses a butyl inner liner PU pasting skin football based on high sealing performance and a preparation process thereof. The butyl inner liner is used to replace a traditional rubber inner liner, the air tightness is improved by more than 60%, the air preservation time is prolonged to more than 30 days without the need of inflation, the modified EVA film is used as a buffer layer, the football has soft touch and excellent resilience, and is not easy to deform after strong impact, the enhanced coating formula is used to improve the tensile strength of the pasting cloth by more than 40%, and the inner liner spherical structure is effectively maintained, the high-viscosity hot melt adhesive bonding layer is used, the peeling strength between the shell and the inner liner is improved by more than 50%, and the delamination is effectively prevented, the butyl rubber sealing rubber strip is arranged at the joint, and the air leakage hidden danger of the joint is completely eliminated, the thickness of each layer of material is accurately controlled, the football weight distribution is ensured to be uniform, and the flight stability is significantly improved, and the preparation process uses hot-pressing compounding to replace solvent bonding, no organic solvent residue is left, and the process is environment-friendly and safe.

Description

Technical Field

[0001] This invention relates to the field of sporting goods technology, and in particular to a butyl-lined PU-coated soccer ball with high sealing performance and its manufacturing process. Background Technology

[0002] With the popularization of sports and the improvement of competitive levels, football, as one of the world's most popular sports, has seen increasingly higher requirements for product quality and performance. Currently, domestic and international football manufacturers have undertaken various technological optimizations to address issues such as air leakage, deformation, and poor feel in traditional footballs. For example, in terms of materials, some manufacturers are using polyurethane (PU) leather instead of traditional polyvinyl chloride (PVC) leather for the football's outer skin, utilizing PU leather's better wear resistance and softness to improve the football's lifespan and feel. Regarding the inner bladder material, some studies are attempting to use halogenated butyl rubber or modified natural rubber to replace traditional rubber, improving air tightness and air retention. In terms of structural design, existing technologies enhance the ball's roundness and stability by increasing the number of inner bladder layers or employing multi-layered composite structures. In terms of manufacturing processes, hot-pressing and high-frequency welding are widely used in football production to improve the bonding strength between different material layers.

[0003] However, while existing technologies have improved the performance of footballs to some extent, there are still many technical shortcomings that need to be addressed. First, the problem of insufficient airtightness remains prominent. Traditional rubber bladders or ordinary butyl rubber bladders have high gas permeability, requiring the soccer ball to be re-inflated after 1-2 weeks of normal use, severely impacting the user experience. Second, the ball feels too hard and lacks resilience. The existing buffer layer material between the PU leather and the bladder has a high elastic modulus, resulting in a stiff feel and making the ball prone to permanent deformation under strong impacts. Third, the bladder reinforcement layer has low tensile strength. Traditional bonding fabrics cannot effectively maintain the spherical structure of the bladder, leading to elliptical deformation after long-term use. Furthermore, the bonding strength between the various layers is insufficient, causing the outer shell and bladder to easily delaminate, shortening the soccer ball's lifespan. Additionally, the seams are poorly sealed, with traditional stitching or simple bonding processes allowing gas to easily leak from the seams. Uneven weight distribution is also a problem; current processes struggle to ensure consistent material thickness across all parts of the soccer ball, affecting its flight stability. Finally, the manufacturing process is cumbersome and environmentally unfriendly. Traditional processes use large amounts of organic solvents, polluting the environment and leaving harmful residues.

[0004] To address the aforementioned deficiencies in existing technologies, this invention provides a butyl-lined PU-coated soccer ball with high sealing performance and its manufacturing process, aiming to solve the technical problems in existing technologies such as poor airtightness, stiff feel, insufficient toughness, easy deformation, low bonding strength, easy air leakage at seams, uneven weight distribution, and environmentally unfriendly manufacturing process. Summary of the Invention

[0005] The purpose of this invention is to provide a butyl-lined PU-coated soccer ball with high sealing performance and its preparation process, which solves the problems of poor air tightness, stiff feel, insufficient toughness, easy deformation, low bonding strength, easy air leakage at the seams, uneven weight distribution, and environmentally unfriendly preparation process of the prior art.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a manufacturing process for a butyl-lined PU-coated soccer ball with high sealing performance, comprising the following steps: Polyurethane leather was prepared by mixing polyurethane resin and nylon-66 salt. Modified EVA film was prepared by adding ethylene-vinyl acetate copolymer and ZPOE plastic into a mixer; The modified EVA film is attached to the surface of PU leather using a hot-pressing process to obtain the outer shell; Isobutylene and isoprene raw materials are added to a rubber kneader to obtain a butyl inner liner; The fabric is immersed in a reinforcing coating to produce a laminated fabric; The inner liner is made by attaching the bonding fabric to the surface of the butyl inner liner through a hot-pressing composite process. A high-viscosity hot melt adhesive layer is coated on the surface of the inner bladder, and the outer shell is attached to the surface of the inner bladder to obtain the finished football.

[0007] The step of "mixing polyurethane resin and nylon-66 salt to prepare PU leather" includes the following steps: The polyurethane resin was dried in a vacuum drying oven, and the nylon-66 salt was ground to a particle size ≤100μm. The dried polyurethane resin and the ground nylon-66 salt were added to a mixing tank at a mass ratio of (7-9):1. The solvent N,N-dimethylformamide was added and the mixture was stirred for 2-3 hours to obtain the coating slurry. After uniformly coating the release agent on the release paper surface and drying and curing, the coating slurry is coated onto the release paper using a doctor blade coating machine. After each layer is coated, it is dried in an oven. The coating is repeated 3-5 times to form a multi-layer film. The knitted base fabric is preheated and bonded to a multi-layer film using pressure rollers. The bonded composite material is then dried in an oven, and the PU leather is allowed to cool naturally to room temperature.

[0008] The step of "preparing modified EVA film by adding ethylene-vinyl acetate copolymer and ZPOE plastic into a mixer" includes the following steps: The ethylene-vinyl acetate copolymer and ZPOE plastic were initially dispersed evenly in a high-speed mixer; Add the premixed material to the internal mixer and mix until the material is completely plasticized and has a uniform color; The molten material after internal mixing is filtered through a filter screen and then fed into a single-screw extruder to obtain modified EVA masterbatch; Modified EVA masterbatch is added to a calender, calendered, and then cooled to obtain modified EVA film.

[0009] The step of "attaching a modified EVA film to the surface of PU leather via a hot-pressing process to obtain a shell" includes the following steps: Surface pretreatment was performed on the PU leather surface and the modified EVA film; Polyurethane hot melt adhesive is uniformly coated onto the surface of PU leather, and the coated PU leather and modified EVA film are preheated separately. The modified EVA film is covered on the surface of the coated PU leather, and then cooled by a cooling roller after being bonded by a hot press roller. Cut the cooled outer shell material to the size of a soccer ball, mark the front and back sides, and then roll it up for later use.

[0010] The step of "adding isobutylene and isoprene raw materials to a rubber kneader to obtain a butyl inner liner" includes the following steps: An initiator was added to isobutylene and isoprene, and after pre-cooling, the mixture was added to a reaction vessel and stirred. Add methanol as a terminator to the mixed raw materials to terminate the reaction; The polymerization product is added to a rubber kneader, along with a vulcanizing agent, accelerator, and antioxidant to obtain melt rubber. The compounded rubber is injected into the inner liner mold, and after vulcanization, it is cooled and demolded to obtain a butyl inner liner.

[0011] The step of "immersing the fabric in a reinforcing coating to obtain the laminated fabric" includes the following steps: Singeing process is applied to polyester knitted fabric; Weigh 20-30% epoxy resin, 10-20% modifier, 1-5% reinforcing agent, 5-10% filler, and the remainder solvent. Mix them evenly in a mixing tank, and then impregnate the polyester knitted fabric through the impregnation tank. The impregnated fabric is dried in an oven, and the dried fabric is then heat-cured and cooled to obtain the laminated fabric.

[0012] Secondly, the butyl-lined PU-coated soccer ball with high sealing performance is prepared using the preparation process of the butyl-lined PU-coated soccer ball with high sealing performance described in the first aspect.

[0013] This invention relates to a high-sealing butyl-lined PU-coated soccer ball and its manufacturing process. The invention uses a butyl liner instead of a traditional rubber liner, improving airtightness by over 60% and extending air retention time to over 30 days without the need for inflation. A modified EVA film serves as a buffer layer, giving the soccer ball a soft touch and excellent resilience, making it less prone to deformation after strong impacts. A developed reinforcing coating formula increases the tensile strength of the bonding fabric by over 40%, effectively maintaining the spherical structure of the liner. A high-viscosity hot melt adhesive layer increases the peel strength between the outer shell and the liner by over 50%, effectively preventing delamination. Butyl rubber sealing strips are installed at the seams to completely eliminate the risk of air leakage. Precise control of the thickness of each material layer ensures uniform weight distribution and significantly improved flight stability. The manufacturing process uses hot-pressing composite bonding instead of solvent bonding, leaving no organic solvent residue, making it environmentally friendly and safe. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0015] Figure 1 This is a flowchart of the preparation process of the butyl-lined PU-coated soccer ball with high sealing performance provided by the present invention.

[0016] Figure 2 This is a flowchart of the process of preparing PU leather by mixing polyurethane resin and nylon-66 salt.

[0017] Figure 3 This is a flowchart of the process of preparing modified EVA film by adding ethylene-vinyl acetate copolymer and ZPOE plastic into a mixer.

[0018] Figure 4 This is a flowchart of a process for attaching a modified EVA film to the surface of PU leather using a hot-pressing technique to create a shell.

[0019] Figure 5 This is a flowchart of the process of adding isobutylene and isoprene raw materials to a rubber kneader to produce a butyl inner liner.

[0020] Figure 6 This is a flowchart of a process of immersing fabric in a reinforcing coating to produce a laminated fabric.

[0021] Figure 7 The flowchart describes the process of attaching a bonding fabric to the surface of a butyl inner liner using a hot-pressing composite process to obtain the inner liner.

[0022] Figure 8 The flowchart describes the process of coating a high-viscosity hot melt adhesive layer onto the inner bladder surface, attaching the outer shell to the inner bladder surface, and thus producing a finished soccer ball. Detailed Implementation

[0023] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0024] Please see Figures 1 to 8 In a first aspect, the present invention provides a manufacturing process for a butyl-lined PU-coated soccer ball with high sealing performance, comprising the following steps: S1 mixes polyurethane resin and nylon-66 salt to prepare PU leather; S11 The polyurethane resin is dried in a vacuum drying oven, and the nylon-66 salt is ground to a particle size ≤100μm; S12. The dried polyurethane resin and the ground nylon-66 salt are added to a mixing tank at a mass ratio of (7-9):1. The solvent N,N-dimethylformamide is added and the mixture is stirred for 2-3 hours to obtain the coating slurry. S13 is a release agent that is uniformly coated on the surface of release paper and then dried and cured. The coating slurry is then coated onto the release paper using a doctor blade coater. Each layer is dried in an oven after coating, and the coating is repeated 3-5 times to form a multi-layer film. S14 preheats the knitted base fabric and uses pressure rollers to bond the base fabric with a multi-layer film. The bonded composite material is then dried in an oven, and the PU leather is naturally cooled to room temperature.

[0025] Specifically, the polyurethane resin is dried in a vacuum drying oven at 80-100℃ for 2-4 hours to remove moisture; nylon-66 salt is ground to a particle size ≤100μm and set aside; the dried polyurethane resin and the ground nylon-66 salt are added to a mixing tank at a mass ratio of (7-9):1, along with the solvent N,N-dimethylformamide, with the solid content controlled at 25-35%, and stirred at 40-60℃ for 2-3 hours to obtain a uniform coating slurry; release paper with a surface finish Ra ≤0.8μm is selected, and a release agent is uniformly coated on the surface of the release paper, then stirred at 80-100℃... Dry and cure at ℃; apply the coating slurry onto the release paper using a doctor blade coater, with a coating thickness of 0.1-0.2 mm / layer. After each layer is coated, dry it in an oven at 100-120℃ for 3-5 minutes. Repeat the coating 3-5 times to form a multi-layer film; preheat the knitted base fabric to 60-80℃, and use a pressure roller to bond the base fabric to the multi-layer film at a bonding pressure of 0.3-0.5 MPa; dry the bonded composite material in an oven at 120-140℃ for 10-15 minutes to allow the solvent to fully evaporate; allow the dried PU leather to cool naturally to room temperature, peel it off from the release paper, and roll it up for later use.

[0026] S2 involves adding ethylene-vinyl acetate copolymer and ZPOE plastic into a mixer to prepare modified EVA film; S21 adds ethylene-vinyl acetate copolymer and ZPOE plastic to a high-speed mixer for initial and uniform dispersion; S22 Add the premixed material to the internal mixer and mix until the material is completely plasticized and has a uniform color; S23 filters the molten material after internal mixing through a filter screen and then feeds it into a single-screw extruder to obtain modified EVA masterbatch; S24 involves adding modified EVA masterbatch to a calender, calendering it, and then cooling it to obtain a modified EVA film.

[0027] Specifically, weigh out ethylene-vinyl acetate copolymer and ZPOE plastic at a mass ratio of (3-5):1, with the vinyl acetate content in the ethylene-vinyl acetate copolymer being 18-28%. Add the ethylene-vinyl acetate copolymer and ZPOE plastic to a high-speed mixer at a speed of 800-1200 rpm for 5-10 minutes to initially disperse the two raw materials evenly. Add the premixed material to an internal mixer at a mixing temperature of 120-140℃ and a rotor speed of 30-50 rpm for mixing. The mixing time is 15-25 minutes, until the material is completely plasticized and the color is uniform. The molten material after mixing is filtered through a 200-300 mesh filter to remove unplasticized impurities and gel particles. The filtered material is added to a single screw extruder and extruded at a temperature of 140-160℃. The material is then extruded through a die and pelletized to obtain modified EVA masterbatch. The modified EVA masterbatch is added to a calender and calendered at a temperature of 150-170℃ using a three-roll calender to a thickness of 0.3-0.8mm. After cooling and setting, the material is wound up.

[0028] S3 uses a hot-pressing process to attach a modified EVA film to the surface of PU leather to create the outer shell; S31 performs surface pretreatment on PU leather and modified EVA film; S32 uniformly coats the PU leather surface with polyurethane hot melt adhesive, and preheats the coated PU leather and modified EVA film separately. S33 involves covering the surface of the coated PU leather with a modified EVA film, bonding it with a hot press roller, and then cooling it with a cooling roller. S34 cuts the cooled outer shell material to the size of a soccer ball, marks the front and back sides, and then rolls it up for later use.

[0029] Specifically, the PU leather surface obtained in S1 and the modified EVA film surface obtained in S2 are treated with plasma or corona treatment respectively, with a surface tension ≥38dyn / cm; polyurethane hot melt adhesive is uniformly coated on the PU leather surface, with an adhesive amount of 8-12g / m²; the coated PU leather and modified EVA film are preheated to 90-110℃ respectively; the modified EVA film is covered on the coated PU leather surface and laminated by hot press rollers, with a hot pressing temperature of 110-130℃, a hot pressing pressure of 0.2-0.4MPa, and a hot pressing time of 3-5 seconds; the laminated composite material is cooled to below 40℃ by cooling rollers at a cooling rate of 5-10℃ / min; the material tension is kept constant during the cooling process, with a tension value of 10-20N / m; the cooled shell material is cut according to the size of a soccer ball, the front and back are marked, and then rolled up for later use.

[0030] S4 adds isobutylene and isoprene raw materials to a rubber kneader to produce a butyl inner liner; S41 adds an initiator to isobutylene and isoprene, and after pre-cooling, adds it to the reaction vessel and stirs to mix. S42 adds methanol as a terminator to the mixed raw materials to terminate the reaction; S43 adds the polymerization product to a rubber kneader, along with vulcanizing agent, accelerator, and antioxidant to obtain melt rubber; S44 injects the compounded rubber into the inner liner mold, and after vulcanization, it is cooled and demolded to obtain a butyl inner liner.

[0031] Specifically, isobutylene and isoprene are weighed at a mass ratio of (95-98):(2-5), and an initiator accounting for 0.5-1.5% of the total monomer mass is added; the monomer raw materials are pre-cooled at a low temperature of -10℃ to -5℃, added to the reactor and stirred for 10-15 minutes; under nitrogen protection, the reaction temperature is controlled at -5℃ to 5℃, the stirring speed is 100-200 rpm, and the reaction time is 2-3 hours until the viscosity reaches the requirement; methanol is added as a terminator to terminate the reaction, and the temperature is raised to 40-60℃ to remove unreacted monomers; the polymerization product is added to a rubber kneader and kneaded at 80-100℃ for 20-30 minutes, and vulcanizing agent, accelerator, and antioxidant are added; the compound is injected into the inner mold and vulcanized at 150-170℃ and 10-15MPa pressure for 10-15 minutes; after vulcanization, it is cooled to below 60℃ to demold, the rough edges are trimmed, the airtightness is checked, and qualified products proceed to the next process.

[0032] S5 involves immersing the fabric in a reinforcing coating to produce a laminated fabric; S51 is used to singe polyester knitted fabric. S52 weigh 20-30% epoxy resin, 10-20% modifier, 1-5% reinforcing agent, 5-10% filler, and the remainder solvent, mix them evenly in a mixing tank, and then impregnate the polyester knitted fabric through the impregnation tank. S53 involves drying the impregnated fabric in an oven, then heat-curing and cooling the dried fabric to obtain a laminated fabric.

[0033] Specifically, select 18-pound polyester knitted fabric and singe it under tension to remove surface fuzz; weigh 20-30% epoxy resin, 10-20% modifier, 1-5% reinforcing agent, 5-10% filler, and the remainder solvent by weight, and mix them evenly in a mixing tank, controlling the viscosity to 2000-4000 mPa·s; pass the 18-pound fabric through an impregnation tank for 2-3 seconds, with a liquid retention rate of 80-120%; control the uniform liquid retention on the fabric surface using extrusion rollers, with an extrusion pressure of 0.2-0.4 MPa; dry the impregnated fabric in an oven at 100-120℃ for 5-8 minutes to remove the solvent; heat-cure the dried fabric at 140-160℃ for 10-15 minutes to fully cross-link the epoxy resin; allow it to cool naturally to room temperature, and test the tensile strength to ≥500 N / 5 cm before winding it up for later use.

[0034] S6 attaches the bonding fabric to the surface of the butyl inner liner through a hot-pressing composite process to obtain the inner liner; S61 roughens the outer surface of the butyl inner liner with sandpaper, and then evenly coats the outer surface of the butyl inner liner with chlorinated rubber adhesive and lets it dry until surface dry. S62 involves preheating the bonding fabric and wrapping it around the surface of the glued butyl inner liner, then hot-pressing and cooling it to obtain the inner liner.

[0035] Specifically, roughen the outer surface of the butyl inner liner obtained from S4 with sandpaper and clean to remove dust; evenly coat the outer surface of the butyl inner liner with chlorinated rubber adhesive at a rate of 10-15 g / m², and let it dry for 5-10 minutes until surface dry; preheat the bonding fabric obtained from S5 to 80-100℃; wrap the bonding fabric around the surface of the adhesive-coated butyl inner liner, place it in a hot press mold, and hot press at a temperature of 120-150℃, a pressure of 0.3-0.6 MPa, and a time of 5-8 minutes; after hot pressing, cool to below 60℃ under pressure for 10-15 minutes; check for air bubbles and wrinkles between the bonding fabric and the inner liner, and repair any defects; trim the edges according to the standard football inner liner dimensions to ensure a roundness error ≤2mm.

[0036] S7 coats the inner bladder surface with a high-viscosity hot melt adhesive layer, and then attaches the outer shell to the inner bladder surface to produce the finished soccer ball.

[0037] S71 has a high-viscosity polyurethane hot melt adhesive uniformly coated on the inner liner surface. S72 cuts the outer shell material into the shape of a football piece and marks the inner bladder surface; S73 follows the football-style splicing sequence, attaching the outer shell pieces one by one to the inner bladder surface, and applying butyl rubber sealing strips to the seams of adjacent outer shell pieces; S74 places the glued soccer ball into a spherical mold, heat-presses and shapes it, then cools and demolds it, allowing it to stand to obtain the finished soccer ball.

[0038] Specifically, the outer surface of the inner liner obtained from S6 is cleaned and treated with plasma to increase its surface energy; a high-viscosity polyurethane hot melt adhesive is uniformly coated onto the inner liner surface with a thickness of 0.1-0.3 mm and a coating temperature of 130-150℃; the outer shell material obtained from S3 is cut into the shape of soccer ball pieces, and positioning marks are made on the inner liner surface; following the soccer ball piece splicing sequence, the outer shell pieces are attached to the inner liner surface piece by piece, and each piece is rolled with a pressure roller to remove air bubbles after attachment; butyl rubber is applied to the seams of adjacent outer shell pieces. Use adhesive sealing strips, 5-8mm wide and 0.2-0.3mm thick; place the glued soccer ball into a spherical mold and heat-press it at 100-120℃ and 0.4-0.6MPa pressure for 15-20 minutes; cool the mold to below 30℃ at a rate of 3-5℃ / min, and let it stand for more than 24 hours after demolding to allow the adhesive to fully cure; inflate the finished soccer ball to 0.6-0.8 bar, check the airtightness and roundness, and package and store it after passing the inspection.

[0039] Secondly, the butyl-lined PU-coated soccer ball with high sealing performance is prepared using the preparation process of the butyl-lined PU-coated soccer ball with high sealing performance described in the first aspect.

[0040] In this embodiment, the device includes an outer shell and an inner liner. The outer shell is composed of PU leather and a modified EVA film. The PU leather is prepared by a dry manufacturing process using polyurethane resin and nylon-66 salt. The modified EVA film comprises ethylene-vinyl acetate copolymer and ZPOE plastic, and is attached to the outer surface of the PU leather. The inner liner comprises a butyl liner and a bonding fabric. The butyl liner is formed by the copolymerization of isobutylene and isoprene. The bonding fabric is composed of 18-pound fabric and a reinforcing coating. The reinforcing coating comprises 20-30% epoxy resin, 10-20% modifier, 1-5% reinforcing agent, and 5-10% filler. The bonding fabric is attached to the outer surface of the butyl liner. The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A manufacturing process for a butyl-lined PU-coated soccer ball with high sealing performance, characterized in that, Includes the following steps: Polyurethane leather was prepared by mixing polyurethane resin and nylon-66 salt. Modified EVA film was prepared by adding ethylene-vinyl acetate copolymer and ZPOE plastic into a mixer; The modified EVA film is attached to the surface of PU leather using a hot-pressing process to obtain the outer shell; Isobutylene and isoprene raw materials are added to a rubber kneader to obtain a butyl inner liner; The fabric is immersed in a reinforcing coating to produce a laminated fabric; The inner liner is made by attaching the bonding fabric to the surface of the butyl inner liner through a hot-pressing composite process. A high-viscosity hot melt adhesive layer is coated on the surface of the inner bladder, and the outer shell is attached to the surface of the inner bladder to obtain the finished football.

2. The preparation process of the butyl-lined PU-coated soccer ball with high sealing performance as described in claim 1, characterized in that, The process of "preparing PU leather by mixing polyurethane resin and nylon-66 salt" includes the following steps: The polyurethane resin was dried in a vacuum drying oven, and the nylon-66 salt was ground to a particle size ≤100μm. The dried polyurethane resin and the ground nylon-66 salt were added to a mixing tank at a mass ratio of (7-9):

1. The solvent N,N-dimethylformamide was added and the mixture was stirred for 2-3 hours to obtain the coating slurry. After uniformly coating the release agent on the release paper surface and drying and curing, the coating slurry is coated onto the release paper using a doctor blade coating machine. After each layer is coated, it is dried in an oven. The coating is repeated 3-5 times to form a multi-layer film. The knitted base fabric is preheated and bonded to a multi-layer film using pressure rollers. The bonded composite material is then dried in an oven, and the PU leather is allowed to cool naturally to room temperature.

3. The preparation process of the butyl-lined PU-coated soccer ball with high sealing performance as described in claim 1, characterized in that, The process of "preparing modified EVA film by adding ethylene-vinyl acetate copolymer and ZPOE plastic into a mixer" includes the following steps: The ethylene-vinyl acetate copolymer and ZPOE plastic were initially dispersed evenly in a high-speed mixer; Add the premixed material to the internal mixer and mix until the material is completely plasticized and has a uniform color; The molten material after internal mixing is filtered through a filter screen and then fed into a single-screw extruder to obtain modified EVA masterbatch; Modified EVA masterbatch is added to a calender, calendered, and then cooled to obtain modified EVA film.

4. The preparation process of the butyl-lined PU-coated soccer ball with high sealing performance as described in claim 1, characterized in that, The process of "attaching a modified EVA film to the surface of PU leather via a hot-pressing process to obtain a shell" includes the following steps: Surface pretreatment was performed on the PU leather surface and the modified EVA film; Polyurethane hot melt adhesive is uniformly coated onto the surface of PU leather, and the coated PU leather and modified EVA film are preheated separately. The modified EVA film is covered on the surface of the coated PU leather, and then cooled by a cooling roller after being bonded by a hot press roller. Cut the cooled outer shell material to the size of a soccer ball, mark the front and back sides, and then roll it up for later use.

5. The preparation process of the butyl-lined PU-coated soccer ball with high sealing performance as described in claim 1, characterized in that, The process of "adding isobutylene and isoprene raw materials to a rubber kneader to obtain a butyl inner liner" includes the following steps: An initiator was added to isobutylene and isoprene, and after pre-cooling, the mixture was added to a reaction vessel and stirred. Add methanol as a terminator to the mixed raw materials to terminate the reaction; The polymerization product is added to a rubber kneader, along with a vulcanizing agent, accelerator, and antioxidant to obtain melt rubber. The compounded rubber is injected into the inner liner mold, and after vulcanization, it is cooled and demolded to obtain a butyl inner liner.

6. The preparation process of the butyl-lined PU-coated soccer ball with high sealing performance as described in claim 1, characterized in that, The process of "immersing fabric in reinforcing coating to obtain laminated fabric" includes the following steps: Singeing process is applied to polyester knitted fabric; Weigh 20-30% epoxy resin, 10-20% modifier, 1-5% reinforcing agent, 5-10% filler, and the remainder solvent. Mix them evenly in a mixing tank, and then impregnate the polyester knitted fabric through the impregnation tank. The impregnated fabric is dried in an oven, and the dried fabric is then heat-cured and cooled to obtain the laminated fabric.

7. A soccer ball with a butyl bladder and PU leather skin, characterized in that, The soccer ball is prepared using the manufacturing process of the butyl-lined PU-coated soccer ball with high sealing performance as described in any one of claims 1-6.

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