A foamed solid bonding ball and its preparation method

Abstract

This invention discloses a foamed solid laminated ball, comprising a solid core, an adhesive film layer, and a ball sheet arranged sequentially from the inside out. The specific manufacturing process is as follows: a pre-prepared foaming material is injected into a mold cavity to form a foamed solid core; the mold cavity is shaped like a basketball, soccer ball, volleyball, or rugby ball. An adhesive layer is applied to the prepared foamed solid core, and the processed ball sheet is also coated with an adhesive layer. The adhesive-coated ball sheet and the adhesive-coated solid core are then bonded together manually or automatically to form a solid laminated ball. The solid laminated ball is placed in a heated mold, where the core and the ball sheet are firmly bonded together under high temperature. This patented foamed solid core has a short manufacturing process, low labor costs, and its elasticity is unaffected by changes in air pressure, requiring no inflation and never leaking.

Description

Technical Field

[0001] This invention relates to the field of rubber basketball technology, specifically to a foamed solid bonding ball and its preparation method. Background Technology

[0002] Conventional adhesive-bonded inflatable balls consist of an inner liner, a wrapping layer or fabric layer, a rubber layer, and a leather layer. The weight of these balls has a wide range of control, resulting in a large range of bouncing fluctuations. Furthermore, the manufacturing process is lengthy, leading to low production efficiency and high labor costs. After manufacturing, the balls require inflation to maintain their elasticity and shape. Changes in internal air pressure, influenced by ambient temperature and the amount of inflation, directly affect the ball's feel and elasticity.

[0003] Furthermore, prolonged use may lead to insufficient air pressure, resulting in decreased jumping performance and balance, severely impacting the player's performance. In particular, some manufacturers use inferior rubber materials to reduce costs, causing the product's shelf life to deteriorate. Moreover, because glued inflatable balls feel hard and produce a metallic echo when hit, their use is significantly limited, making them unsuitable for children's entertainment or training at home.

[0004] Currently, silent balls have appeared on the market. The surface of these balls is almost entirely made of foam material. Although soft, they are not wear-resistant enough and have a short service life, lasting only 1-2 months, which greatly increases the economic cost for users. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a foamed solid bonding ball and its preparation method.

[0006] To achieve the above objectives, the specific solution of the present invention is as follows: One of the objectives of this invention is to provide a foamed solid laminated ball, comprising a solid matrix, a film layer, and a ball sheet arranged sequentially from the inside to the outside; The solid tire body is made of foamed material, and the raw material composition of the foamed material is as follows, by weight: polyurethane: 70-100 parts, EPDM rubber: 20-50 parts, diphenylmethane diisocyanate (MDI): 50-80 parts, purified water: 10-20 parts, cyclopentane: 2-5 parts, catalyst: 4-10 parts, dimethylethanolamine: 2-5 parts, antimony chloride flame retardant: 2-5 parts, foaming agent: 5-20 parts, silicone polyether emulsion: 3 parts, oil: 5-10 parts.

[0007] Furthermore, the catalyst is an organic amine DABCO and an organotin DBTDL, wherein the amount of each is 2-5 parts.

[0008] Furthermore, the oil is paraffin oil and silicone oil, wherein the paraffin oil content is 2-3 parts and the silicone oil content is 3-7 parts.

[0009] The second objective of this invention is to provide a method for preparing a foamed solid laminated ball, the steps of which are as follows: S1. Making a solid fetal body A foaming slurry is prepared by mixing 70-100 parts of polyurethane, 20-50 parts of EPDM rubber, 50-80 parts of diphenylmethane diisocyanate, 10-20 parts of purified water, 2-5 parts of cyclopentane, 4-10 parts of catalyst, 2-5 parts of dimethylethanolamine, 2-5 parts of antimony chloride flame retardant, 5-20 parts of foaming agent, 3 parts of silicone polyether emulsion, and 5-10 parts of oil. The foaming slurry is then poured into the mold cavity and the mold is closed. A porous foamed solid body is obtained through a foaming injection mechanism. S2. Apply a layer of adhesive to the foamed solid body and let it air dry at room temperature or bake it in an oven; S3. Sticker skin The cut ball skin is attached to the outside of the solid foam body, and after repair and curing, a solid foam body is obtained.

[0010] Furthermore, in S1, the temperature of the foaming injection machine is maintained at 40-60℃.

[0011] Furthermore, in step S1, before injecting the foaming slurry, a layer of polytetrafluoroethylene is coated on the inner wall of the mold cavity to obtain a non-porous foamed solid body.

[0012] Furthermore, the specific operation of applying the ball skin in S3 is as follows: A certain thickness of foam material is punched into the required shape of a ball skin. The edges of the punched sheet are trimmed, and a layer of adhesive is applied to the ball skin. It is then dried for later use, with the drying temperature controlled at 30-60 degrees Celsius. The ball skin, which has been coated with adhesive, is precisely glued onto the solid foam body according to its sheet shape to produce a solid foam ball.

[0013] Preferably, the foaming material used is one or more composite materials selected from PVC, PU, ​​microfiber PU, TPE foam, EVA foam, TPU, ETPU foam, and LOPE foam.

[0014] Due to the adoption of the above technical solutions, the beneficial effects of the present invention include: 1. The production process of this patented solid foam tire body is short and the labor cost is low. Compared with the conventional inflatable balloon tire made of glued air, the production process is long and the labor cost is high, making it more competitive in the market.

[0015] 2. The foamed solid laminated ball of this application has a wear-resistant outer layer glued to the outside of the solid body, which makes it wear-resistant and its service life is 5-10 times longer than that of silent balls on the market. It can also achieve the same silent effect and can be used indoors or outdoors without being restricted by the site.

[0016] 3. The solid foam ball produced in this application is soft, won't hurt your hands when patted or kicked, its elasticity is unaffected by changes in air pressure, requires no inflation, and will never leak air. Attached Figure Description

[0017] Figure 1 3D rendering of the finished product of a solid foam-bonded ball; Figure 2 A cross-sectional view of a solid foamed sphere; The reference numerals used in the above figures are explained as follows: 1. Solid carcass; 2. Rubber film layer; 31. Strand; 32. Smooth layer; 4. Laminate; 41. Laminate edge. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. At the same time, the raw materials mentioned below, unless otherwise specified, are all commercially available products; the process steps or preparation methods not mentioned in detail are all process steps or preparation methods known to those skilled in the art. Example 1

[0019] like Figure 1-2 As shown, a method for preparing a solid foamed basketball includes the following steps: S1. Take 90 parts of polyurethane: Covestro Texin 1250 polyether, 50 parts of EPDM rubber, 50 parts of MDI diphenylmethane diisocyanate, 20 parts of purified water, 5 parts of cyclopentane, catalyst: 4 parts of organic amine DABCO, 5 parts of organic tin DBTDL, 3 parts of dimethylethanolamine, 4 parts of antimony chloride flame retardant, 18 parts of azodicarbonamide foaming agent, 3 parts of silicone polyether emulsion, and oil (3 parts of paraffin oil and 6 parts of silicone oil). After mixing, store in a room with a constant temperature of 25°C and a relative humidity of 50% to maintain the stability of the adhesive. Then, use a foaming injection machine to automatically and accurately inject the adhesive into the mold cavity according to the set weight and close the mold. The temperature of the injection machine is maintained at 60°C. At this time, the slurry foams freely and evenly in the mold cavity. The gas generated by the foaming is discharged through the opening at the mold closing position. After 5 minutes of mold closing, open the mold and take out the foamed body to obtain a foamed solid body. Solid foam bodies come in two types: those with and without pores. The non-porous type has a layer of polytetrafluoroethylene (PTFE) coated on the inner wall of the mold cavity before the foaming adhesive is poured in. This seals the foam pores on the surface of the foam body, forming a protective film that is wear-resistant and solvent-resistant. The porous type does not require PTFE coating and has a mold cavity shaped like a basketball sheet, or a smooth mold cavity that does not require a sheet shape for automatic bonding. S2. Apply a layer of neoprene adhesive to the foamed solid body and dry it in a 60℃ oven. S3. A certain thickness of PVC foam material is punched or welded into basketball skin. The shape can be square, hexagonal, triangular, pentagonal, an 8-piece basketball shape, a drum shape, or a flying fish shape, or any other sheet shape that can be assembled into a ball. The punched skin is then used with a high-frequency machine to transfer the customer's desired pattern and logo onto the corresponding pieces of the ball. The punched pieces are then beveled around the edges, thinning the edges by 4-6mm to a thickness of 1mm, giving the finished piece a slight slope and a pleasing appearance. Alternatively, the edges can be left unbeveled to match the height of the core with the struts, creating a beveled basketball. A layer of polyurethane adhesive is then applied to the skin and dried at 60℃. The prepared ball skin, coated with adhesive, is manually and precisely glued onto the solid foam body according to its shape to form a solid foam ball. Then, it is placed in a shaping mold and hot-pressed to accelerate the curing of the adhesive. Temperature: 70℃, Time: 240 seconds. Example 2

[0020] like Figure 1-2 As shown, a method for preparing a solid foamed soccer ball includes the following steps: S1. Take 70 parts of polyurethane: Covestro 300 series polyester, 20 parts of EPDM rubber, 60 parts of diphenylmethane diisocyanate MDI, 10 parts of purified water, 4 parts of cyclopentane, catalysts: 5 parts of organic amine DABCD, 5 parts of organic tin DBTDL, 4 parts of dimethylethanolamine, 4 parts of flame retardant antimony chloride, 8 parts of foaming agent, 3 parts of silicone polyether emulsion, and oils (3 parts of paraffin oil and 5 parts of silicone oil). After mixing, store in a room with a constant temperature of 15 degrees Celsius and a relative humidity of 30% to maintain the stability of the adhesive. Then, use a foaming injection machine to automatically and accurately inject the adhesive into the mold cavity according to the set weight and close the mold. The temperature of the injection machine is maintained at 40°C. At this time, the slurry foams freely and evenly in the mold cavity. The gas generated by the foaming is discharged through the opening at the mold closing position. After closing the mold for 2 minutes, open the mold and take out the foamed body to obtain a foamed solid body. Solid foam bodies include two types: those with or without pores. For those without pores, a layer of polytetrafluoroethylene (PTFE) is applied to the inner wall of the mold cavity before the foaming slurry is poured in. At this time, the foam pores on the surface of the foam body are closed to form a film. For those with pores, it is not necessary to apply PTFE. The mold cavity is provided with a smooth mold cavity that does not require a sheet shape, such as a football sheet shape, or for automatic bonding. S2. Apply a layer of neoprene adhesive to the foamed solid body and dry it in a 30℃ oven; S3. A certain thickness of PVC foam material is punched or welded into a basketball skin. Its shape can be square, hexagonal, triangular, pentagonal, basketball 8-piece shape, drum shape, or flying fish shape, etc., any sheet shape that can be spliced ​​into a ball; the punched skin is directly screen-printed with patterns and logos; a layer of polyurethane adhesive is applied to the skin and dried at 60 degrees Celsius. The prepared ball skins, coated with adhesive, are placed flat in two vacuum adsorption mold cavities. These cavities are engraved with soccer ball dividing lines and bulge outwards. The ball pieces are precisely fitted into the corresponding shaped mold cavities, ensuring a smooth, wrinkle-free fit. Under vacuum adsorption, they adhere firmly to the inner wall of the mold. Then, the prepared solid foam tire body, coated with adhesive, is placed into the mold cavity. The mold automatically closes, and under air pressure, the ball pieces bond to the tire body. Specific conditions are: room temperature 50℃, air blowing time: 30 seconds, air blowing pressure: 6 kgf / cm². 2 . Example 3

[0021] like Figure 1 As shown, a method for preparing a foamed solid laminated ball includes the following steps: S1. Prepare the following polyurethane: 40 parts Covestro 300 series polyester, 40 parts Covestro Texin 1250 polyether, 35 parts EPDM rubber, 70 parts MDI diphenylmethane diisocyanate, 15 parts purified water, 4 parts cyclopentane, and catalyst: organic amine DABCD. 3 parts of organotin DBTDL, 4 parts of dimethylethanolamine, 4 parts of antimony chloride flame retardant, 15 parts of foaming agent, 3 parts of silicone polyether emulsion, and oil (3 parts of paraffin oil and 4 parts of silicone oil) are mixed and stored in a room with a constant temperature of 20°C and a relative humidity of 40% to maintain the stability of the adhesive. Then, the foaming injection machine automatically and accurately injects the amount of adhesive into the mold cavity according to the set weight and closes the mold. The temperature of the injection machine is maintained at 50°C. At this time, the slurry foams freely and evenly in the mold cavity. The gas generated by the foaming is discharged through the opening at the mold closing position. After 4 minutes of mold closing, the mold is opened and the foamed body is taken out to obtain a foamed solid body. Polyurethane comes in two types: polyether and polyester. Polyether has high resilience. When EPDM rubber is added, the resilience is even higher, comparable to that of a regular inflatable basketball.

[0022] Solid foam bodies include two types: those with or without pores. For those without pores, a layer of polytetrafluoroethylene (PTFE) is applied to the inner wall of the mold cavity before the foaming slurry is poured in. At this time, the foam pores on the surface of the foam body are closed to form a film. For those with pores, it is not necessary to apply PTFE. The mold cavity is provided with a smooth mold cavity that does not require a sheet shape, such as a spherical shape, or for automatic bonding. S2. Apply a layer of neoprene adhesive to the foamed solid body and dry it in a 50℃ oven; S3. A certain thickness of PVC foam material is punched or welded into basketball skin. The shape can be square, hexagonal, triangular, pentagonal, basketball 8-piece type, drum-shaped, or flying fish-shaped, etc., any sheet shape that can be spliced ​​into a ball; the punched skin is then transferred with the customer's required pattern and logo onto the corresponding pieces of the ball using a high-frequency machine, or the pattern and logo are directly screen-printed; a layer of polyurethane adhesive is applied to the skin and dried at 60 degrees Celsius. The prepared spherical skins, coated with adhesive, are placed flat in two vacuum adsorption mold cavities. These cavities are marked with spherical dividing lines and bulge outwards. The spherical pieces are precisely fitted into the corresponding shaped mold cavities, resulting in a smooth, wrinkle-free fit. Under vacuum adsorption, they adhere firmly to the inner wall of the mold. Then, the prepared solid foamed tire body, coated with adhesive, is placed into the mold cavity. The mold automatically closes, and under air pressure, the spherical pieces bond to the tire body. Specific conditions are: room temperature 50℃, air blowing time: 100 seconds, air blowing pressure: 5 kgf / cm². 2 .

[0023] The solid bonding spheres prepared by the above method have the following properties as shown in Table 1: Table 1

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. However, any modifications, alterations, and variations made by those skilled in the art without departing from the scope of the present invention based on the disclosed technical content are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A foamed solid bonded ball characterized in that, It includes a solid tire body, a rubber film layer, and a ball plate arranged sequentially from the inside out; The solid tire body is made of foamed material, and the raw material composition of the foamed material is as follows, by weight: polyurethane: 70-100 parts, EPDM rubber: 20-50 parts, diphenylmethane diisocyanate (MDI): 50-80 parts, purified water: 10-20 parts, cyclopentane: 2-5 parts, catalyst: 4-10 parts, dimethylethanolamine: 2-5 parts, antimony chloride flame retardant: 2-5 parts, foaming agent: 5-20 parts, silicone polyether emulsion: 3 parts, oil: 5-10 parts.

2. The foamed solid bonded sphere of claim 1, wherein, The catalyst is an organic amine DABCO and an organotin DBTDL, wherein the amount of each is 2-5 parts.

3. The foamed solid laminated ball as described in claim 1, characterized in that, The oil is paraffin oil and silicone oil, wherein the paraffin oil content is 2-3 parts and the silicone oil content is 3-7 parts.

4. A method for preparing a foamed solid laminated ball, characterized in that, The steps are as follows: S1. Making a solid fetal body A foaming slurry is prepared by mixing 70-100 parts of polyurethane, 20-50 parts of EPDM rubber, 50-80 parts of diphenylmethane diisocyanate, 10-20 parts of purified water, 2-5 parts of cyclopentane, 4-10 parts of catalyst, 2-5 parts of dimethylethanolamine, 2-5 parts of antimony chloride flame retardant, 5-20 parts of foaming agent, 3 parts of silicone polyether emulsion, and 5-10 parts of oil. The foaming slurry is then poured into the mold cavity and the mold is closed. A porous foamed solid body is obtained through a foaming injection mechanism. S2. Apply a layer of adhesive to the foamed solid body, let it air dry at room temperature or bake it in an oven to obtain a film layer; S3. Sticker skin The cut ball skin is attached to the outside of the solid foam body, and after repair and curing, a solid foam body is obtained.

5. The preparation method according to claim 4, characterized in that, In step S1, the temperature of the foaming injection machine is maintained at 40-60℃.

6. The preparation method according to claim 4, characterized in that, In step S1, before injecting the foaming slurry, a layer of polytetrafluoroethylene is coated on the inner wall of the mold cavity to obtain a non-porous foamed solid body.

7. The preparation method according to claim 4, characterized in that, The specific operation of applying the ball skin in S3 is as follows: A certain thickness of foam material is punched into the required shape of a ball skin. The edges of the punched sheet are trimmed, and a layer of adhesive is applied to the ball skin. It is then dried for later use, with the drying temperature controlled at 30-60 degrees Celsius. The ball skin, which has been coated with adhesive, is precisely glued onto the solid foam body according to its sheet shape to produce a solid foam ball.

8. The preparation method according to claim 7, characterized in that, The foaming material used is one or more composite materials selected from PVC, PU, ​​microfiber PU, TPE foam, EVA foam, TPU, ETPU foam, and LOPE foam.

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