A sports ball with a kneaded polyurethane material as an outer skin structure

Abstract

The present application relates to a sports ball with a kneaded polyurethane material as an outer skin structure, comprising a leather layer, a surface layer and an adhesive layer, wherein the surface layer comprises a kneaded polyurethane, an inorganic filler, a leveling agent and a thickener; the kneaded polyurethane comprises a polyurethane prepolymer and D-xylose. The present application has the effect of improving the mechanical strength and stability of the prepared sports ball.

Description

Technical Field

[0001] The present application relates to the field of sports balls, and in particular to a sports ball with a mixed polyurethane material as an outer skin structure. Background Art

[0002] Sports balls are a type of sporting goods. Currently, common sports ball structures include sewn balls, rubber balls, leather (bonded) balls, etc. Sewn balls are made of PVC, TPU, or PU leather as the outer skin material, and are sewn together by hand or by a sewing machine after cutting; rubber balls are sports balls with an inner layer as a bladder for storing air pressure, a chemical fiber material as a skeleton layer, and natural rubber as the main outer skin material; leather (bonded) balls have an inner layer as a bladder for storing air pressure, with chemical fiber winding or covering as the skeleton layer, and finally the leather cut pieces are bonded together with glue.

[0003] Polyurethane synthetic leather is often used as the outer material of leather balls. The production of polyurethane synthetic leather mainly includes dry method and wet method. With the development of industry, the preparation technology of polyurethane synthetic leather has also developed rapidly. However, the production of polyurethane synthetic leather currently prepared has differences, which makes it difficult to improve the bonding performance between the various components of the prepared sports balls, affecting the strength of the sports balls. Summary of the invention

[0004] In order to improve the strength of a sports ball, the present application provides a sports ball using a mixed polyurethane material as an outer skin structure.

[0005] The present application provides a sports ball with a mixed polyurethane material as the outer skin structure, which adopts the following technical solution: a sports ball with a mixed polyurethane material as the outer skin structure, comprising a leather layer, a surface layer and an adhesive layer, wherein the surface layer comprises mixed polyurethane, an inorganic filler, a leveling agent and a thickener; the mixed polyurethane comprises a polyurethane prepolymer and D-xylose.

[0006] By adopting the above technical scheme, polyurethane is an organic high molecular polymer with an amino acid ester structure on the molecular chain segment, forming a block structure with alternating soft segments and hard segments, so that the polyurethane has good elasticity, mechanical strength and wear resistance, etc., and can be used as the surface layer of a sports ball to improve various properties of the sports ball. D-xylose and a polyurethane prepolymer are compounded to prepare a composite polyurethane, which further enhances the bonding performance of the prepared surface layer. At the same time, an inorganic filler is added, and the inorganic filler is interconnected with the fibers on the surface of the leather layer, thereby enhancing the connection between the polyurethane and the silica. At the same time, the inorganic filler fills the pores of the composite polyurethane, so that the various components in the composite polyurethane are tightly combined, further improving the stability and mechanical strength of the prepared sports ball.

[0007] Preferably, the polyurethane prepolymer raw material includes isophorone diisocyanate, polytetramethylene ether glycol, dibutyltin dilaurate, N-methyldiethanolamine and 2,2-dihydroxymethylpropionic acid.

[0008] By adopting the above technical scheme, the formate groups in the prepared polyurethane prepolymer interact with the hydrogen bonds on the manufacturing cloth fiber groups in the leather layer, which can effectively improve the bonding ability with the manufacturing cloth fibers, thereby improving the overall mechanical strength of the leather. The -COOH in 2,2-dihydroxymethylpropionic acid increases the electrostatic repulsion between molecular chains after the neutralization reaction to form salt, reduces the entanglement of molecular chains, facilitates dispersion in water, and promotes penetration and bonding with leather fibers.

[0009] Preferably, the composite polyurethane is prepared by the following method: Isophorone diisocyanate and polytetramethylene glycol are mixed and uniformly mixed under oil bath conditions, and then dibutyltin dilaurate is added, the temperature is raised to react, and N-methyldiethanolamine and 2,2-dihydroxymethylpropionic acid are added to react to obtain a polyurethane prepolymer; D-xylose is added to the polyurethane prepolymer to react, and triethylamine is added after cooling to neutralize the reaction to obtain a composite polyurethane.

[0010] By adopting the above technical solution, D-xylose is a biomass resource, in which -OH can react with -NCN. D-xylose is used as a modifier to modify the polyurethane prepolymer to form a nonlinear structure, thereby increasing the three-dimensional cross-linking sites between the prepared composite polyurethane and the leather fibers in the leather layer, so that the composite polyurethane and the leather fibers can be more firmly bonded, thereby improving the stability of the prepared sports ball and improving its softness.

[0011] Preferably, the mass ratio of the polytetramethylene glycol, isophorone diisocyanate and D-xylose is 1:(0.7-0.8):0.05.

[0012] By adopting the above technical solution, preferably the mass ratio of polytetramethylene ether diol, isophorone diisocyanate and D-xylose is within the above range, which can further improve the stability of the prepared composite polyurethane.

[0013] Preferably, the inorganic filler comprises silicon dioxide and modified graphene oxide.

[0014] By adopting the above technical solution, graphene oxide has good mechanical properties and can be filled into the pore structure of the composite polyurethane after being compounded with silica to improve the overall bonding performance of the system, thereby further improving the stability of the prepared sports ball. Silica is an inorganic chemical material, which is combined with modified graphene oxide and added to the composite polyurethane system, thereby making the bonding between the leather layer and the surface layer more stable.

[0015] Preferably, the modified graphene oxide comprises graphene and tetraethylenepentamine.

[0016] Preferably, the modified graphene oxide is prepared by the following method: The graphene oxide is ultrasonically dispersed in water to obtain a graphene oxide dispersion, tetraethylenepentamine is added to the graphene oxide dispersion, magnetically stirred, and then reacted in a hydrothermal reactor, washed and freeze-dried to obtain modified graphene oxide.

[0017] By adopting the above technical scheme, the surface of graphene oxide is modified using the straight-chain modifier alkane amine tetraethylenepentamine, and the oxygen-containing groups on the surface of graphene oxide react with the amine groups on the surface of tetraethylenepentamine to form stable amide bonds. The dispersion performance of the prepared modified graphene oxide in the system is improved, and at the same time, the stability is also improved, and the compatibility of the modified graphene oxide in the system is improved, so that the mechanical properties of the prepared motion are improved.

[0018] Preferably, the mass ratio of the graphene oxide to tetraethylenepentamine is 1:(2.9-3.3).

[0019] By adopting the above technical solution, preferably the mass ratio between graphene oxide and tetraethylenepentamine is within the above range, the stability of the prepared modified graphene oxide can be further improved.

[0020] Preferably, the inorganic filler is prepared by the following method: The modified graphene oxide, sodium dodecylbenzene sulfonate and water are mixed, potassium silicate is added, the mixture is stirred, filtered and washed, and freeze-dried to obtain an inorganic filler.

[0021] By adopting the above technical scheme, nano-silicon dioxide is in situ grown on the surface of modified graphene oxide by a low-temperature precipitation method and dispersed in the composite polyurethane, which can effectively improve the mechanical properties, thermal stability, rheological properties, etc. of the polyurethane, thereby improving the mechanical strength and toughness of the prepared sports ball, and greatly improving the tear resistance of the sports ball.

[0022] Preferably, the mass ratio between the potassium silicate and the modified graphene oxide is (2-2.2):1.

[0023] By adopting the above technical solution, preferably the mass ratio between potassium silicate and modified graphene oxide is within the above range, which can further improve the overall comprehensive performance of the prepared inorganic filler.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. The composite polyurethane is prepared by compounding D-xylose with a polyurethane prepolymer. The -OH in D-xylose reacts efficiently with the -NCO in the polyurethane prepolymer to form a nonlinear structure with the polyurethane prepolymer, thereby increasing the three-dimensional cross-linking sites between the prepared composite polyurethane and the leather fibers of the leather layer, thereby enabling a more stable combination between the surface layer and the leather fibers. At the same time, the softness and mechanical properties of the prepared sports ball are further improved. 2. Inorganic fillers are added to the system. After silicon dioxide is in situ grown on the surface of modified graphene oxide and then combined with composite polyurethane, the mechanical properties and stability of the composite polyurethane can be effectively improved. The inorganic fillers hinder the segment flow of the composite polyurethane, thereby further improving the deformation resistance and mechanical stability of the prepared sports ball, thereby improving the tear resistance of the sports ball; 3. The surface of graphene oxide is modified by tetraethylenepentamine, and the oxygen-containing groups of graphene oxide react with the amino groups of tetraethylenepentamine to form stable amide bonds, so that the dispersibility of the prepared modified graphene oxide in the system is improved. At the same time, the compatibility of the prepared inorganic filler in the system is improved, further improving the overall comprehensive performance of the composite polyurethane. DETAILED DESCRIPTION

[0025] The present application is further described in detail below with reference to the embodiments: Raw materials description: All raw materials in the examples can be obtained from commercial sources.

[0026] Example 1 Preparation of modified graphene oxide: 11.54 g of graphene oxide was ultrasonically dispersed in 500 mL of deionized water to obtain a graphene oxide dispersion, 33.46 g of tetraethylenepentamine (CAS No.: 112-57-2) was added to the graphene oxide dispersion, and then ammonia water was added to adjust the pH of the system to 9, and then magnetic stirring was carried out at a temperature of 25°C for 20 minutes, and then the mixture was reacted in a hydrothermal reactor at 180°C for 10 hours, and the mixture was washed alternately with deionized water and ethanol for 5 times, and freeze-dried at a temperature of -20°C for 18 hours to obtain modified graphene oxide.

[0027] Preparation of inorganic fillers: 10 g of modified graphene oxide, 4 g of sodium dodecylbenzene sulfonate (CAS No.: 25155-30-0) and 500 g of deionized water were mixed, and then 20 g of potassium silicate (CAS No.: 1312-76-1) with a modulus of 3.3 was added, and mechanical stirring was performed for 20 min. 1 mol / L hydrochloric acid was added at a temperature of 0°C until the pH of the system was 7. The mixture was allowed to stand for 12 h, and washed 5 times with deionized water under reduced pressure and filtration, and freeze-dried at a temperature of -20°C for 18 h to obtain an inorganic filler.

[0028] Preparation of composite polyurethane: 52g of isophorone diisocyanate (CAS No.: 4098-71-9) and 74.29g of vacuum dehydrated polytetramethylene glycol (CAS No.: 25190-06-1) were mixed and mixed evenly in an oil bath. Then 5.5g of dibutyltin dilaurate (CAS No.: 77-58-7) and 0.02g of dimethylthiotoluene diamine (CAS No.: 106264-79-3) were added. The temperature was raised to 70°C for 2h, and then the temperature was continued to rise to 80°C. 3.6g of N-methyldiethanolamine (CAS No.: 105-59-9) and 5.6g of 2,2-dihydroxymethylpropionic acid (CAS No.: 4767-03-7) were reacted for 2h to obtain a polyurethane prepolymer; 3.71g of D-xylose (CAS No.: 58-86-6) was added to the polyurethane prepolymer, the temperature was maintained at 80°C, the reaction was carried out for 2h, then the temperature was lowered to 40°C, (CAS No.: 121-44-8) was added for neutralization reaction for 0.5h, and then the temperature was lowered to 25°C to obtain a composite polyurethane.

[0029] Preparation of polyurethane emulsion: 100 g of the above-mentioned composite polyurethane was added to 100 g of deionized water and stirred at high speed for emulsification. Unreacted monomers were then removed in a dialysis bag with a molecular weight of 1000. The mixture was then mixed with 12 g of an inorganic filler, 4 g of a thickener and 2 g of a leveling agent and physically stirred for 2 h to obtain a polyurethane emulsion.

[0030] Preparation of millable polyurethane: Pour the polyurethane emulsion into a mold, add 2g of sulfur and 2g of diisopropylbenzene peroxide, then add 0.5g of stearic acid and 10g of carbon black, mix evenly, and vulcanize at 170°C for 10min to obtain a mixed polyurethane.

[0031] Prepare the exercise balls: The mixed polyurethane is calendered to obtain a surface layer; the adhesive is coated on the surface layer with a scraper, and dried in an oven at 80°C to obtain an adhesive layer; the lining is attached to the adhesive layer with a laminating pressure of 5MPa, and aged in an oven at 130°C to obtain a PU leather fabric, and the PU leather fabric is laminated on the surface of the bladder using a laminating machine to form a rubber ball, and then vulcanized using a vulcanizer to obtain a sports ball, and the vulcanizing temperature of the vulcanizer is 100°C, the vulcanizing time is 15min, and the air pressure is 5kgf / cm2.

[0032] Example 2 Preparation of modified graphene oxide: 10.47 g of graphene oxide was ultrasonically dispersed in 500 mL of deionized water to obtain a graphene oxide dispersion, 34.53 g of tetraethylene pentamine was added to the graphene oxide dispersion, and then ammonia water was added to adjust the pH of the system to 9, and then magnetic stirring was carried out at a temperature of 25°C for 20 minutes, and then the reaction was carried out in a hydrothermal reactor at 180°C for 10 hours, and the mixture was washed alternately with deionized water and ethanol for 5 times, and freeze-dried at a temperature of -20°C for 18 hours to obtain modified graphene oxide.

[0033] Preparation of inorganic fillers: 9.375 g of modified graphene oxide, 4 g of sodium dodecylbenzene sulfonate and 500 g of deionized water were mixed, and then 20.625 g of potassium silicate with a modulus of 3.3 was added, and mechanical stirring was performed for 20 min. 1 mol / L hydrochloric acid was added at a temperature of 0°C until the pH of the system was 7. The mixture was allowed to stand for 12 h, and the mixture was washed 5 times with deionized water under reduced pressure and filtered, and freeze-dried at a temperature of -20°C for 18 h to obtain an inorganic filler.

[0034] Preparation of composite polyurethane: 56.22 g of isophorone diisocyanate and 70.27 g of vacuum-dehydrated polytetramethylene glycol were mixed and mixed evenly in an oil bath. Then, 5.5 g of dibutyltin dilaurate and 0.02 g of dimethylthiotoluenediamine were added, the temperature was raised to 70°C for reaction for 2 h, and then the temperature was continued to be raised to 80°C. 3.6 g of N-methyldiethanolamine and 5.6 g of 2,2-dihydroxymethylpropionic acid were added and reacted for 2 h to obtain a polyurethane prepolymer. 3.51 g of D-xylose was added to the polyurethane prepolymer, the temperature was maintained at 80°C, the reaction was carried out for 2 h, and then the temperature was lowered to 40°C. Triethylamine was added for neutralization reaction for 0.5 h, and then the temperature was lowered to 25°C to obtain a composite polyurethane.

[0035] Preparation of polyurethane emulsion: 120 g of the above-mentioned composite polyurethane was added to 120 g of deionized water and stirred at high speed for emulsification. Unreacted monomers were then removed in a dialysis bag with a molecular weight of 1000. The mixture was then mixed with 16 g of an inorganic filler, 6 g of a thickener and 4 g of a leveling agent and physically stirred for 2 hours to obtain a polyurethane emulsion.

[0036] Preparation of millable polyurethane: Pour the polyurethane emulsion into a mold, add 2g of sulfur and 2g of diisopropylbenzene peroxide, then add 0.5g of stearic acid and 10g of carbon black, mix evenly, and vulcanize at 170°C for 10min to obtain a mixed polyurethane.

[0037] Prepare the exercise balls: The mixed polyurethane is calendered to obtain a surface layer; the adhesive is coated on the surface layer with a scraper, and dried in an oven at 80°C to obtain an adhesive layer; the lining is attached to the adhesive layer with a laminating pressure of 5MPa, and aged in an oven at 130°C to obtain a PU leather fabric, and the PU leather fabric is laminated on the surface of the bladder using a laminating machine to form a rubber ball, and then vulcanized using a vulcanizer to obtain a sports ball, and the vulcanizing temperature of the vulcanizer is 100°C, the vulcanizing time is 15min, and the air pressure is 5kgf / cm2.

[0038] Example 3 Preparation of modified graphene oxide: 10.98 g of graphene oxide was ultrasonically dispersed in 500 mL of deionized water to obtain a graphene oxide dispersion, 34.02 g of tetraethylenepentamine was added to the graphene oxide dispersion, and then ammonia water was added to adjust the pH of the system to 9, followed by magnetic stirring at 25°C for 20 min, and then reacted in a hydrothermal reactor at 180°C for 10 h, washed alternately with deionized water and ethanol 5 times, and freeze-dried at -20°C for 18 h to obtain modified graphene oxide.

[0039] Preparation of inorganic fillers: 9.68 g of modified graphene oxide, 4 g of sodium dodecylbenzene sulfonate and 500 g of deionized water were mixed, and then 20.32 g of potassium silicate with a modulus of 3.3 was added, and mechanical stirring was performed for 20 min. 1 mol / L hydrochloric acid was added at a temperature of 0°C until the pH of the system was 7. The mixture was allowed to stand for 12 h, and the mixture was washed 5 times with deionized water under reduced pressure and filtered, and freeze-dried at a temperature of -20°C for 18 h to obtain an inorganic filler.

[0040] Preparation of composite polyurethane: 54.17 g of isophorone diisocyanate and 72.22 g of vacuum dehydrated polytetramethylene glycol were mixed and mixed evenly in an oil bath. Then, 5.5 g of dibutyltin dilaurate and 0.02 g of dimethylthiotoluenediamine were added. The temperature was raised to 70°C for reaction for 2 h. Then, the temperature was further raised to 80°C. 3.6 g of N-methyldiethanolamine and 5.6 g of 2,2-dihydroxymethylpropionic acid were added and reacted for 2 h to obtain a polyurethane prepolymer. 3.61 g of D-xylose was added to the polyurethane prepolymer. The temperature was maintained at 80°C for reaction for 2 h. Then, the temperature was lowered to 40°C. Triethylamine was added for neutralization reaction for 0.5 h. Then, the temperature was lowered to 25°C to obtain a composite polyurethane.

[0041] Preparation of polyurethane emulsion: 110 g of the above-mentioned composite polyurethane was added into 110 g of deionized water and stirred at high speed for emulsification. Unreacted monomers were then removed in a dialysis bag with a molecular weight of 1000. The mixture was then mixed with 14 g of inorganic filler, 5 g of thickener and 3 g of leveling agent and physically stirred for 2 h to obtain a polyurethane emulsion.

[0042] Preparation of millable polyurethane: Pour the polyurethane emulsion into a mold, add 2g of sulfur and 2g of diisopropylbenzene peroxide, then add 0.5g of stearic acid and 10g of carbon black, mix evenly, and vulcanize at 170°C for 10min to obtain a mixed polyurethane.

[0043] Prepare the exercise balls: The mixed polyurethane is calendered to obtain a surface layer; the adhesive is coated on the surface layer with a scraper, and dried in an oven at 80°C to obtain an adhesive layer; the lining is attached to the adhesive layer with a laminating pressure of 5MPa, and aged in an oven at 130°C to obtain a PU leather fabric, and the PU leather fabric is laminated on the surface of the bladder using a laminating machine to form a rubber ball, and then vulcanized using a vulcanizer to obtain a sports ball, and the vulcanizing temperature of the vulcanizer is 100°C, the vulcanizing time is 15min, and the air pressure is 5kgf / cm2.

[0044] Example 4 Example 4 is based on Example 3. When preparing modified graphene oxide in Example 4, 12.5 g of graphene oxide and 32.5 g of tetraethylenepentamine are used.

[0045] Example 5 Example 5 is based on Example 3. When preparing modified graphene oxide in Example 5, 9.75 g of graphene oxide and 35.22 g of tetraethylenepentamine are used.

[0046] Example 6 Example 6 is based on Example 3. When preparing the inorganic filler in Example 6, 19.29 g of potassium silicate and 10.71 g of modified graphene oxide are used.

[0047] Example 7 Example 7 is based on Example 3. When preparing the inorganic filler in Example 7, 21.18 g of potassium silicate and 8.82 g of modified graphene oxide are used.

[0048] Example 8 Example 8 is based on Example 3. When preparing the composite polyurethane in Example 8, 78.79 g of polytetramethylene ether diol, 47.27 g of isophorone diisocyanate and 3.94 g of D-xylose are used.

[0049] Example 9 Example 9 is based on Example 3. When preparing the composite polyurethane in Example 9, 66.67 g of polytetramethylene ether diol, 60 g of isophorone diisocyanate and 3.33 g of D-xylose are used.

[0050] Example 10 Example 10 is based on Example 3. When preparing the inorganic filler, the modified graphene oxide is replaced by unmodified graphene oxide.

[0051] Embodiment 11 Example 11 is based on Example 3. In Example 11, no D-xylose is added when preparing the composite polyurethane.

[0052] Comparative Example 1 Comparative Example 1 is based on Example 3, and no inorganic filler is added to the composite polyurethane in Comparative Example 1.

[0053] Comparative Example 2 Comparative Example 2 is based on Example 3, and in Comparative Example 2, the polyurethane emulsion is replaced by an unmodified aqueous polyurethane emulsion.

[0054] Performance testing The following performance tests were performed on the samples of Examples 1-11 and Comparative Examples 1-2: (1) Tear strength Based on GBT17928-1999 as the testing standard, the tear strength of the samples was tested and the test results were filled in Table 1.

[0055] (2) Tensile strength Based on the testing standard of "QB / T 2716-2005", the tensile strength of the samples was tested and the test results were filled in Table 1.

[0056] Table 1 Performance test results of Examples 1-11 and Comparative Examples 1-2 Test items Tensile strength / MPa Tear strength / N / mm Example 1 22.8 28.8 Example 2 22.6 29.1 Example 3 23.4 29.7 Example 4 20.4 26.2 Example 5 21.1 26.6 Example 6 19.7 25.6 Example 7 19.8 26.0 Example 8 17.2 22.0 Example 9 17.8 21.7 Example 10 18.1 23.2 Embodiment 11 14.2 16.8 Comparative Example 1 13.1 14.3 Comparative Example 2 9.4 12.5 Combined with Table 1, the tensile strength of Examples 1-3 is 22.6 MPa or above, and the tear resistance is 28.8 N / mm or above, which shows that the sports ball prepared in the present application has good tear resistance and tensile strength.

[0057] In Examples 4 and 5, when preparing modified graphene oxide, the mass ratio of graphene oxide to tetraethylene pentamine is not within the range specified in the present application. When the amount of tetraethylene pentamine used is too small, graphene oxide is difficult to react with a sufficient amount of tetraethylene pentamine to form a stable amide bond, and the modification effect of graphene oxide is difficult to be further improved. The dispersibility and compatibility of graphene oxide in the system are difficult to be further improved. Graphene oxide agglomerates in the system, thereby affecting the stability of the modified graphene oxide, and all the performances of Example 4 are affected. When the amount of tetraethylene pentamine used is too much, with the increase in the amount of molecular grafting, the thermal degradation rate of graphene oxide is affected, thereby affecting the stability of graphene oxide, so all the performances of Example 5 are affected.

[0058] In Example 6 and Example 7, when preparing the inorganic filler, the mass ratio of potassium silicate to modified graphene oxide is not within the range specified in the present application. When the amount of potassium silicate added is too little, it is difficult to form a sufficient amount of silicon dioxide on the surface of the modified graphene oxide, and the bonding performance between silicon dioxide and the modified graphene oxide is difficult to improve, so it is difficult to further improve the performance of the composite polyurethane; when the amount of potassium silicate added is too much, too much silicon dioxide is generated on the surface of the modified graphene oxide, and the silicon dioxide is severely agglomerated, affecting the overall stability of the inorganic filler. Therefore, the performance of Implementation 6 and Example 7 is reduced.

[0059] In Example 8 and Example 9, when preparing composite polyurethane, the mass ratio of polytetramethylene glycol, isophorone diisocyanate and D-xylose is not within the range defined in the present application. When the content of isophorone diisocyanate is too little, a prepolymer with a large relative molecular weight is easily generated, which makes the viscosity of the system too large and is not easy to shear and disperse in the system. At the same time, the content of D-xylose is affected. Too much D-xylose increases the cross-linking density of the polyurethane molecules, and the molecular chains are entangled with each other, which is not conducive to emulsification. When the content of isophorone diisocyanate is too much, there will be more participating -NCO in the system, and hydrophobic segments will be generated during the emulsification process, which will affect the emulsification effect of the system, resulting in the composite polyurethane having an excessively large particle size, reduced stability, and affecting the performance of the system. At the same time, too little D-xylose will also affect the system of the emulsion particle size. Therefore, the performance of Example 8 and Example 9 are both reduced.

[0060] In Example 10, unmodified graphene is used when preparing the inorganic filler. The dispersibility of the unmodified graphene oxide is difficult to improve, and it agglomerates in the system, affecting the overall performance of the system. Therefore, the performance of Example 10 is reduced.

[0061] In Example 11, no D-xylose is added to the composite polyurethane. For polyurethane that has not been modified with D-xylose, -OH cannot react with -NCO, making it difficult for the prepared composite polyurethane to further combine with the leather fiber at points. Therefore, it is difficult to further improve the bonding performance between the composite polyurethane and the leather fiber, and it is difficult to improve the stability of the prepared sports ball. Therefore, the performance of Example 11 is reduced.

[0062] No inorganic filler is added to the composite polyurethane in Comparative Example 1. Without filling the gaps in the composite polyurethane, it is difficult to further promote the tightness of the bonding between the various components of the composite polyurethane, and it is also difficult to improve the connection stability with the leather fibers. Therefore, the performance of Comparative Example 1 is reduced.

[0063] In Comparative Example 2, the polyurethane emulsion is replaced with an unmodified aqueous polyurethane emulsion. The bonding performance between the unmodified polyurethane emulsion and the leather fiber is difficult to be further improved, and the stability is reduced, so the performance of Comparative Example 2 is reduced.

[0064] This specific embodiment is only an explanation of the present application, and it is not a limitation of the present application. Through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of ​​the present application. The technical scope of the present application is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A sports ball with a kneadable polyurethane material as the outer skin structure, characterized in that: The invention comprises a leather layer, a surface layer and an adhesive layer. The surface layer comprises mixed polyurethane, inorganic filler, a leveling agent and a thickener. The mixed polyurethane comprises a polyurethane prepolymer and D-xylose.

2. A sports ball with a kneadable polyurethane material as an outer skin structure according to claim 1, characterized in that: The polyurethane prepolymer raw materials include isophorone diisocyanate, polytetramethylene ether glycol, dibutyltin dilaurate, N-methyldiethanolamine and 2,2-dihydroxymethylpropionic acid.

3. A sports ball with a kneadable polyurethane material as an outer skin structure according to claim 2, characterized in that: The composite polyurethane is prepared by the following method: Isophorone diisocyanate and polytetramethylene glycol are mixed and uniformly mixed under oil bath conditions, and then dibutyltin dilaurate is added, the temperature is raised to react, and N-methyldiethanolamine and 2,2-dihydroxymethylpropionic acid are added to react to obtain a polyurethane prepolymer; D-xylose is added to the polyurethane prepolymer to react, and triethylamine is added after cooling to neutralize the reaction to obtain a composite polyurethane.

4. A sports ball with a kneadable polyurethane material as an outer skin structure according to claim 3, characterized in that: The mass ratio of the polytetramethylene ether diol, isophorone diisocyanate and D-xylose is 1:(0.7-0.8):0.

05.

5. The sports ball with a kneadable polyurethane material as the outer skin structure according to claim 1, characterized in that: The inorganic filler includes silicon dioxide and modified graphene oxide.

6. A sports ball with a kneadable polyurethane material as an outer skin structure according to claim 5, characterized in that: The modified graphene oxide comprises graphene and tetraethylenepentamine.

7. A sports ball with a kneadable polyurethane material as an outer skin structure according to claim 6, characterized in that: The modified graphene oxide is prepared by the following method: The graphene oxide is ultrasonically dispersed in water to obtain a graphene oxide dispersion, tetraethylenepentamine is added to the graphene oxide dispersion, magnetically stirred, and then reacted in a hydrothermal reactor, washed and freeze-dried to obtain modified graphene oxide.

8. The sports ball with a kneadable polyurethane material as the outer skin structure according to claim 7, characterized in that: The mass ratio between the graphene oxide and tetraethylenepentamine is 1:(2.9-3.3).

9. The sports ball with a kneadable polyurethane material as the outer skin structure according to claim 5, characterized in that: The inorganic filler is prepared by the following method: The modified graphene oxide, sodium dodecylbenzene sulfonate and water are mixed, potassium silicate is added, the mixture is stirred, filtered and washed, and freeze-dried to obtain an inorganic filler.

10. The sports ball with a kneadable polyurethane material as the outer skin structure according to claim 1, characterized in that: The mass ratio between the potassium silicate and the modified graphene oxide is (2-2.2):1.