CN109453499B - Basketball and manufacturing process thereof - Google Patents
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- CN109453499B CN109453499B CN201811266374.2A CN201811266374A CN109453499B CN 109453499 B CN109453499 B CN 109453499B CN 201811266374 A CN201811266374 A CN 201811266374A CN 109453499 B CN109453499 B CN 109453499B
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- 238000004519 manufacturing process Methods 0.000 title abstract description 8
- 229920001971 elastomer Polymers 0.000 claims abstract description 33
- 239000005060 rubber Substances 0.000 claims abstract description 33
- 239000002994 raw material Substances 0.000 claims abstract description 22
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- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 claims description 3
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- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical group C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B41/00—Hollow inflatable balls
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Landscapes
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Tyre Moulding (AREA)
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a basketball and a manufacturing process thereof, and relates to the technical field of sports goods. The technical key points are as follows: the basketball sequentially comprises a rubber inner container, a yarn layer, a middle tire layer and a sheath from inside to outside, wherein the middle tire layer is made of the same raw materials as the sheath, and the middle tire layer and the sheath are made of the following components in parts by weight: 30-35 parts of natural rubber; 10-20 parts of butadiene rubber; 2.2-2.6 parts of zinc oxide; 0.4-0.8 part of stearic acid; 20-30 parts of activated calcium carbonate; 2-8 parts of white carbon black; 0.6-1.2 parts of naphthenic oil; accelerator DM1-1.5 parts; 0.1-0.3 part of accelerator TT; 1-1.5 parts of sulfur; 1-5 parts of phenolic resin. The invention has the advantages of promoting the self-healing of cracks, improving the elasticity of the basketball and prolonging the service life of the basketball.
Description
Technical Field
The invention relates to the technical field of sports goods, in particular to a basketball and a manufacturing process thereof.
Background
Basketball was invented in 1891 by the american james nemes smith. At that time, he was religious at the national training school of the youth congress of stupefeld chendu, ma. Because of the local abundance of peaches, children here also enjoy playing the game of putting balls into the peach basket. This gives him an inspiration from it and draws the characteristics of other ball items, such as football, hockey, etc., creating a basketball game.
The invention discloses a preparation method of a basketball wear-resistant surface layer material in Chinese patent publication No. CN108129710A, wherein the basketball wear-resistant surface layer material comprises natural rubber, nitrile rubber, acrylic resin, polyamide acid resin, carbon fiber, white corundum, alumina superfine powder, xylene, quartz sand, zirconia, corrosion-resistant resin, ethylene-vinyl acetate copolymer, glycerol and polyurethane.
Light, heat, ozone, radiation, flexion deformation and metals such as copper and manganese can all promote the ageing of rubber, and it is the fatal weak point of natural rubber to not resist ageing, because the basketball can receive high strength's striking in the use, the easy crack that produces in basketball crust, the crack can further expand during the use, reduces the elasticity and the life of basketball.
Disclosure of Invention
In view of the shortcomings of the prior art, it is an object of the present invention to provide a basketball with the advantages of promoting self-healing of cracks, improving the elasticity and prolonging the life of the basketball.
The second purpose of the invention is to provide a manufacturing process of the basketball, and the basketball manufactured by the process can promote the self-healing of cracks, improve the elasticity of the basketball and prolong the service life of the basketball.
In order to achieve the first purpose, the invention provides the following technical scheme:
a basketball sequentially comprises a rubber inner container, a yarn layer, a middle tire layer and a sheath from inside to outside, wherein the middle tire layer and the sheath are made of the same raw materials, and the raw materials comprise 3-6 parts by weight of crack self-healing microcapsules;
the crack self-healing microcapsule comprises a capsule core and a capsule wall, wherein the capsule core is a polymer emulsion solidified at normal temperature, and the capsule wall is made of a high-molecular organic material sensitive to crack stress.
Through adopting above-mentioned technical scheme, when basketball crust inside or surface produced the crack, cracked stress made the cyst wall of crack self-healing microcapsule break, fill in the crack and solidify gradually behind the cyst core outflow, avoided the crack to further expand, impel the crack to self-heal, improved basketball elasticity and life-span.
Further preferably, the raw materials of the middle tire layer and the outer skin comprise the following components in parts by weight:
30-35 parts of natural rubber;
10-20 parts of butadiene rubber;
2.2-2.6 parts of zinc oxide;
0.4-0.8 part of stearic acid;
20-30 parts of activated calcium carbonate;
2-8 parts of white carbon black;
0.6-1.2 parts of naphthenic oil;
1-1.5 parts of an accelerator DM;
0.1-0.3 part of accelerator TT;
1-1.5 parts of sulfur;
1-5 parts of phenolic resin.
By adopting the technical scheme, the natural rubber with good elasticity, wear resistance and water resistance is used as the main material, after the butadiene rubber and the phenolic resin are added, the anti-aging performance is improved, after vulcanization, the cold resistance, wear resistance and elasticity are particularly excellent, the heat generation under the dynamic load is less, the zinc oxide is a good activator of an accelerator and sulfur, the zinc oxide can play a role more quickly and deeply, the stearic acid is matched to adjust the acid-base property, the activation effect is stronger, and the activated calcium carbonate and the white carbon black are compounded for use, so that the product has better wear resistance and is easy to process. Naphthenic oils are good plasticizers for rubber, making it easier to masticate. After the accelerator DM and the accelerator TT are matched for use, the rubber and the sulfur are combined more quickly, so that the vulcanization is completed more quickly and deeply, and the molecules in the rubber are rearranged after the sulfur is added, so that the elasticity and the strength of the rubber are improved, and the rubber is more wear-resistant.
More preferably, the raw materials of the middle tire layer and the outer skin also comprise 0.5-1.5 parts of carbon fiber.
Through adopting above-mentioned technical scheme, carbon fiber can reduce the basketball on the one hand and produce cracked probability, avoids the crack further expansion, and on the other hand can further strengthen the elasticity and the wearability of basketball.
More preferably, the material of the capsule wall is selected from any one of polyacrylic resin, polystyrene resin, urea resin and ethyl cellulose.
By adopting the technical scheme, the material can not only form a film for coating the capsule core, but also can break in time to release the capsule core when being stressed by cracks.
More preferably, the polymer emulsion is any one of acrylic emulsion, ethylene-vinyl acetate copolymer emulsion, polyurethane emulsion and styrene-butadiene rubber emulsion.
By adopting the technical scheme, the emulsion has good fluidity, can flow into cracks after the capsule wall is broken, and can be cured and repaired at normal temperature.
More preferably, the preparation method of the crack self-healing microcapsule comprises the following steps:
s1, adding the capsule wall material into the ethanol solution, stirring and mixing uniformly, then adding the polymer emulsion, and continuing stirring to obtain a mixed solution;
and S2, spray drying the mixed solution by adopting spray coating equipment to obtain the crack self-healing microcapsule.
By adopting the technical scheme, after the ethanol is volatilized, the capsule wall material forms a film and completely wraps the polymer emulsion, so that the crack self-healing microcapsule is formed.
In order to achieve the second purpose, the invention provides the following technical scheme:
a process for manufacturing a basketball, comprising the steps of:
winding a layer of yarn on the surface of the basketball liner to form a yarn layer;
preparing a middle tyre skin by adopting the raw materials of the middle tyre layer, and attaching the middle tyre skin on the surface of the yarn layer to form the middle tyre layer;
preparing a sheath by adopting the raw materials of the middle tire layer, and attaching the sheath to the surface of the yarn layer to obtain a basketball blank;
step four, putting the basketball blank into a spherical mould, closing the spherical mould, and putting the basketball blank into vulcanization equipment for vulcanization;
and fifthly, trimming the vulcanized ball body and sticking a ball ridge line to obtain the basketball.
Through adopting above-mentioned technical scheme, between yarn layer and the well child layer, all need not glue of coating between well child layer and the crust, just adhere together before the vulcanization, integrated into one piece during the vulcanization is connected more firmly between the layer, is difficult for producing the crack.
Further preferably, the preparation method of the middle tire skin and the outer skin comprises the following steps:
a. banburying: putting natural rubber and butadiene rubber into banburying equipment, banburying for the first time, then adding zinc oxide, stearic acid, activated calcium carbonate, white carbon black, naphthenic oil, an accelerator DM, an accelerator TT, phenolic resin and crack self-healing microcapsules, and banburying for the second time to obtain a rubber compound;
b. open mixing: extruding the mixed rubber into a sheet, folding the sheet into a triangular bag from left to right, extruding again, repeatedly folding and extruding for multiple times, rolling the sheet into a coil, standing and cooling for later use to obtain a section of rubber material;
c. adding medicine: the first-stage rubber material which is kept stand for more than 24 hours is milled and softened, sulfur is added, and the second step is repeated to obtain a second-stage rubber material;
d. rolling out a sheet: rolling, drawing, cooling and cutting the two-stage sizing material to obtain a leather sheet with specified thickness and size, and standing for more than 12 hours;
e. cutting into a shape: cutting the leather sheet into small leather sheets with the size required by a single basketball;
f. molding: and (3) putting the small leather sheets into heating equipment, heating the small leather sheets to enable the small leather sheets to be softened again, enabling the small leather sheets to have viscosity, putting the small leather sheets into a leather sheet mold with an air suction opening, and closing the leather sheet mold when the small leather sheets are adsorbed in the leather sheet mold to be hemispherical, so as to obtain hemispherical middle tire skins or outer skins.
By adopting the technical scheme, the small leather sheets are easy to form after being heated and softened, the surface of the small leather sheets has certain viscosity, the small leather sheets can be adhered to a yarn layer or a middle tire leather, and the inner leather and the outer leather are integrally formed after vulcanization, are not easy to separate and are not easy to crack.
More preferably, the vulcanization temperature in the fourth step is 110-.
By adopting the technical scheme, the temperature of the rubber material is increased rapidly and the viscosity is reduced during banburying, and the thermal oxidative aging of the rubber is accelerated when the banburying temperature is too high, so that the physical and mechanical properties of the vulcanized rubber are reduced, namely, the phenomenon of over-refining occurs; too low a temperature will cause the compound to collapse.
In summary, compared with the prior art, the invention has the following beneficial effects:
(1) by adding the crack self-healing microcapsules, when cracks are generated in or on the outer skin of the basketball, the stress of the cracks breaks the capsule wall of the crack self-healing microcapsules, and the capsule core is filled in the cracks and gradually solidified after flowing out, so that the cracks are prevented from further expanding, the cracks are promoted to self-heal, the elasticity of the basketball is improved, and the service life of the basketball is prolonged;
(2) by adding the carbon fibers, on one hand, the probability of cracks generated in the basketball can be reduced, the cracks are prevented from further expanding, and on the other hand, the elasticity and the wear resistance of the basketball can be further enhanced;
(3) between yarn layer and the well child layer, all need not glue of coating between well child layer and the crust, just the bonding is in the same place before the vulcanization, and integrated into one piece during the vulcanization is connected more firmly between the layer, is difficult for producing the crack.
Drawings
Fig. 1 is a schematic cross-sectional view of a basketball of the present invention.
Reference numerals: 1. an inner container; 2. a yarn layer; 3. a middle tire layer; 4. and (4) coating.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example 1: as shown in fig. 1, the basketball sequentially comprises a rubber liner 1, a yarn layer 2, a middle tire layer 3 and a sheath 4 from inside to outside, wherein the yarn layer 2 is formed by winding pure cotton threads, the raw materials of the middle tire layer 3 and the sheath 4 are the same, the raw materials comprise 3 parts by weight of crack self-healing microcapsules, each crack self-healing microcapsule comprises a capsule core and a capsule wall, the capsule core is polymer emulsion cured at normal temperature, and the polymer emulsion in the embodiment is acrylic emulsion; the capsule wall is made of a high-molecular organic material sensitive to crack stress, and the capsule wall in the embodiment is made of polyacrylic resin.
The preparation method of the crack self-healing microcapsule comprises the following steps:
s1, adding the capsule wall material into the ethanol solution, stirring and mixing uniformly, then adding the polymer emulsion, and continuing stirring to obtain a mixed solution;
and S2, spray drying the mixed solution by a spray dryer to obtain the crack self-healing microcapsule.
The raw materials of the middle tire layer 3 and the outer skin 4 comprise the following components in parts by weight:
30 parts of natural rubber;
20 parts of butadiene rubber;
2.2 parts of zinc oxide;
0.4 part of stearic acid;
30 parts of activated calcium carbonate;
2 parts of white carbon black;
0.6 part of naphthenic oil;
1 parts of an accelerator DM;
0.1 part of accelerator TT;
1 part of sulfur;
a phenolic resin 1.
Wherein the grade of the natural rubber is Vietnam 3L big golden cup; the naphthenic oil is KG06 purchased from Xiamen Henrun petrochemical company; the chemical name of the accelerator DM is 2, 2' -dithiodibenzothiazole, and the accelerator DM is DM-75 from Dongguan Forster rubber and plastic technology Limited; accelerator TT is known by the chemical name tetramethylthiuram disulphide.
The preparation method of the middle tyre skin and the outer skin 4 comprises the following steps:
a. banburying: the natural rubber and the butadiene rubber are put into an internal mixer, and the internal mixing pressure is 6.5Kg/cm2The temperature is 115 ℃, the banburying time is 500s, after the first banburying, the zinc oxide, the stearic acid, the activated calcium carbonate, the white carbon black, the naphthenic oil, the accelerant DM, the accelerant TT, the phenolic resin and the crack self-healing microcapsule are added, the second banburying is carried out, and the pressure of the second banburying is 5.5Kg/cm2Carrying out banburying for the second time at the temperature of 100 ℃ for 800s to obtain a rubber compound;
b. open mixing: extruding the rubber compound into a sheet with the thickness of 1mm, folding the sheet into a triangular bag from left to right, extruding again, repeating the folding and extruding steps for three times, rolling the sheet into a coil, standing and cooling for later use to obtain a section of rubber material;
c. adding medicine: the first-stage rubber material which is kept still for more than 24 hours is milled and softened to be 1.5mm, sulfur and foaming agent are added, and the second-stage rubber material is obtained by repeating the step two;
d. rolling out a sheet: rolling, drawing, cooling and cutting the two-stage sizing material to obtain a leather sheet with specified thickness and size, and standing for more than 12 hours;
e. cutting into a shape: cutting the leather sheet into small leather sheets with the size required by a single basketball;
f. molding: and (3) putting the small leather sheets into an oven, heating the small leather sheets to soften the small leather sheets again and have viscosity, wherein the temperature in the oven is 63 ℃, the heating time is 30s, putting the small leather sheets into a leather sheet mold with an air suction opening, and closing the leather sheet mold when the small leather sheets are adsorbed in the leather sheet mold to be hemispherical, so as to obtain the hemispherical middle-sized tire skins or the hemispherical outer skins 4.
The manufacturing process of the basketball comprises the following steps:
winding a layer of yarn on the surface of a basketball liner 1 to form a yarn layer 2;
preparing a middle tyre skin by adopting the raw material of the middle tyre layer 3, and attaching the middle tyre skin to the surface of the yarn layer 2 to form the middle tyre layer 3;
step three, preparing a sheath 4 by adopting the raw materials of the middle tire layer 3, and attaching the sheath 4 to the surface of the yarn layer 2 to obtain a basketball blank;
step four, putting the basketball blank into a spherical mould, closing the spherical mould, and putting the basketball blank into vulcanization equipment for vulcanization, wherein the vulcanization temperature is 109 ℃, and the vulcanization time is 24 min;
and fifthly, trimming the vulcanized ball body and sticking a ball ridge line to obtain the basketball.
Example 2: the basketball is different from the basketball in example 1 in that the weight part of the crack self-healing microcapsules is 5 parts.
Example 3: the basketball is different from the basketball in example 1 in that the weight part of the crack self-healing microcapsules is 6 parts.
Example 4: a basketball, which is different from example 1 in that the polymer emulsion in this example is an ethylene-vinyl acetate copolymer emulsion.
Example 5: a basketball, which is different from example 1 in that the polymer emulsion in this example is a polyurethane emulsion.
Example 6: a basketball, which is different from the basketball of example 1 in that the polymer emulsion in this example is styrene-butadiene rubber emulsion.
Example 7: a basketball is different from example 1 in that the wall of the basketball is made of polystyrene resin.
Example 8: a basketball, which is different from the basketball of the embodiment 1 in that the wall of the basketball is made of urea resin.
Example 9: a basketball differs from example 1 in that the wall of the basketball is made of ethyl cellulose.
Examples 10 to 13: a basketball, which is different from example 1 in that the components of the raw materials of the carcass and the outer skin 4 and their corresponding parts by weight are shown in table 1.
TABLE 1 Components and parts by weight of the raw materials in examples 10-13
Example 14: the basketball differs from the basketball in example 1 in that the raw materials of the middle tire layer 3 and the outer skin 4 further comprise 0.5 part of carbon fibers, and the carbon fibers are added in the first step.
Example 15: a basketball, which is different from the basketball of example 14 in that the raw materials of the middle tire layer 3 and the outer skin 4 further comprise 1 part of carbon fiber.
Example 16: a basketball, which is different from the basketball of the embodiment 14 in that the raw materials of the middle tire layer 3 and the outer skin 4 further comprise 1.5 parts of carbon fiber.
Example 17: a basketball, which is different from the basketball of example 1 in that the vulcanization temperature in the fourth step is 110 ℃ and the vulcanization time is 30 min.
Example 18: a basketball is different from the basketball of example 1 in that the vulcanization temperature in the fourth step is 114 ℃ and the vulcanization time is 28 min.
Example 19: a basketball, which is different from the basketball of example 1 in that the vulcanization temperature in the fourth step is 110 ℃ and the vulcanization time is 25 min.
Comparative example 1: a basketball, which is different from example 1 in that no crack self-healing microcapsules are added.
Comparative example 2: a basketball, which is different from example 1 in that 0.5 parts of crack self-healing microcapsules are added.
Comparative example 3: a basketball, which differs from example 15 in that no crack self-healing microcapsules are added.
Comparative example 4: a basketball, which is different from example 1 in that the method for preparing the middle tire skin and the outer skin 4 comprises the following steps:
a. banburying: the natural rubber and the butadiene rubber are put into an internal mixer, and the internal mixing pressure is 6.5Kg/cm2The temperature is 115 ℃, the banburying time is 500s, after the first banburying, the zinc oxide, the stearic acid, the activated calcium carbonate, the white carbon black, the naphthenic oil, the accelerant DM, the accelerant TT, the phenolic resin and the crack self-healing microcapsule are added, the second banburying is carried out, and the pressure of the second banburying is 5.5Kg/cm2Carrying out banburying for the second time at the temperature of 100 ℃ for 800s to obtain a rubber compound;
b. open mixing: extruding the rubber compound into a sheet with the thickness of 1mm, folding the sheet into a triangular bag from left to right, extruding again, repeating the folding and extruding steps for three times, rolling the sheet into a coil, standing and cooling for later use to obtain a section of rubber material;
c. adding medicine: the first-stage rubber material which is kept still for more than 24 hours is milled and softened to be 1.5mm, sulfur and foaming agent are added, and the second-stage rubber material is obtained by repeating the step two;
d. rolling out a sheet: rolling, drawing, cooling and cutting the two-stage sizing material to obtain a leather sheet with specified thickness and size, and standing for more than 12 hours;
e. cutting into a shape: cutting the leather sheet into small leather sheets with the size required by a single basketball;
f. molding: and (3) placing the small leather sheets into a leather sheet die with an air suction opening, and closing the leather sheet die to obtain the hemispherical middle tire skins or the hemispherical outer skins 4 when the small leather sheets are adsorbed in the leather sheet die to be hemispherical.
The manufacturing process of the basketball comprises the following steps:
winding a layer of yarn on the surface of a basketball liner 1 to form a yarn layer 2;
step two, preparing a middle tyre leather by adopting the raw material of the middle tyre layer 3, and sticking the middle tyre leather on the surface of the yarn layer 2 by adopting glue to form the middle tyre layer 3;
step three, preparing a sheath 4 by adopting the raw materials of the middle tire layer 3, and sticking the sheath 4 on the surface of the yarn layer 2 by adopting glue to obtain a basketball blank;
step four, putting the basketball blank into a spherical mould, closing the spherical mould, and putting the basketball blank into vulcanization equipment for vulcanization, wherein the vulcanization temperature is 109 ℃, and the vulcanization time is 24 min;
and fifthly, trimming the vulcanized ball body and sticking a ball ridge line to obtain the basketball.
Repair efficiency test
Test samples: the basketballs obtained in examples 1 to 19 were used as test samples 1 to 19, and the basketballs obtained in comparative examples 1 to 4 were used as control samples 1 to 4.
The test method comprises the following steps: the repair efficiency of the material was evaluated by cantilever beam impact test: after the impact sample strip is broken by a drop hammer type impact tester, two fracture surfaces of the sample strip are carefully aligned, clamped in a repair clamp, quickly placed in a dryer with argon gas introduced, repaired for 48 hours at room temperature under the argon gas atmosphere, taken out and subjected to impact test again, and the repair efficiency is the ratio of the impact strength after repair to the impact strength before repair. The results are shown in Table 2.
And (3) test results: as can be seen from Table 2, the repair efficiencies of the test samples 1-19 are all over 93%, and are far greater than those of the control samples 1-4; according to the test sample 1 and the control sample 1, after the crack self-healing microcapsule is added, the repair efficiency of the test sample 1 is improved by 65.3%; according to the test sample 1, the control sample 1 and the control sample 3, after the carbon fiber is added, the repair efficiency of the test sample 1 is improved by 27.9%; the crack self-healing microcapsule is added, so that the crack is prevented from further expanding, the crack is promoted to self-heal, the elasticity of the basketball is improved, and the service life of the basketball is prolonged; by adding the carbon fibers, the probability of cracks of the basketball can be reduced, and the cracks are prevented from further expanding; the comparison sample 4 is pasted by glue, so that the repair efficiency is reduced by 12.7%, which shows that the basketball of the invention is pasted together before vulcanization, and is integrally formed during vulcanization, so that the connection between layers is firmer, and cracks are not easy to generate.
TABLE 2 repair efficiency test results for test samples 1-19 and control samples 1-4
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (1)
1. The basketball sequentially comprises a rubber inner container (1), a yarn layer (2), a middle tyre layer (3) and a sheath (4) from inside to outside, and is characterized in that the middle tyre layer (3) and the sheath (4) are made of the same raw materials, and the middle tyre layer (3) and the sheath (4) are made of the following components in parts by weight:
30-35 parts of natural rubber;
10-20 parts of butadiene rubber;
2.2-2.6 parts of zinc oxide;
0.4-0.8 part of stearic acid;
20-30 parts of activated calcium carbonate;
2-8 parts of white carbon black;
0.6-1.2 parts of naphthenic oil;
1-1.5 parts of an accelerator DM;
0.1-0.3 part of accelerator TT;
1-1.5 parts of sulfur;
1-5 parts of phenolic resin;
3-6 parts of crack self-healing microcapsules;
0.5-1.5 parts of carbon fiber;
the crack self-healing microcapsule consists of a capsule core and a capsule wall, wherein the capsule core is polymer emulsion cured at normal temperature, and the capsule wall is made of a high-molecular organic material sensitive to crack stress;
the material of the capsule wall is selected from any one of polyacrylic resin, polystyrene resin and ethyl cellulose;
the polymer emulsion is any one of acrylic emulsion, ethylene-vinyl acetate copolymer emulsion, polyurethane emulsion and styrene-butadiene rubber emulsion;
the crack self-healing microcapsule is prepared by the following steps:
s1, adding the capsule wall material into the ethanol solution, stirring and mixing uniformly, then adding the polymer emulsion, and continuing stirring to obtain a mixed solution;
s2, spray drying the mixed solution by adopting spray coating equipment to obtain crack self-healing microcapsules;
the middle tyre skin and the outer skin (4) are prepared by the following steps:
a. banburying: putting natural rubber and butadiene rubber into banburying equipment, banburying for the first time, then adding zinc oxide, stearic acid, activated calcium carbonate, white carbon black, naphthenic oil, an accelerator DM, an accelerator TT, phenolic resin and crack self-healing microcapsules, and banburying for the second time to obtain a rubber compound;
b. open mixing: extruding the mixed rubber into a sheet, folding the sheet into a triangular bag from left to right, extruding again, repeatedly folding and extruding for multiple times, rolling the sheet into a coil, standing and cooling for later use to obtain a section of rubber material;
c. adding medicine: the first-stage rubber material which is kept stand for more than 24 hours is milled and softened, sulfur is added, and the second step is repeated to obtain a second-stage rubber material;
d. rolling out a sheet: rolling, drawing, cooling and cutting the two-stage sizing material to obtain a leather sheet with specified thickness and size, and standing for more than 12 hours;
e. cutting into a shape: cutting the leather sheet into small leather sheets with the size required by a single basketball;
f. molding: the small leather sheets are put into heating equipment to be heated and softened again, have viscosity, are put into a leather sheet mould with an air suction opening, when the small leather sheets are adsorbed in the leather sheet mould to be hemispherical, the leather sheet mould is closed to obtain hemispherical middle fetal skins or outer skins (4),
the basketball is prepared by the following steps:
winding a layer of yarn on the surface of a basketball liner (1) to form a yarn layer (2);
step two, preparing a middle tyre skin by adopting the raw material of the middle tyre layer (3), and attaching the middle tyre skin to the surface of the yarn layer (2) to form the middle tyre layer (3);
preparing a sheath (4) by adopting the raw materials of the middle tire layer (3), and attaching the sheath (4) to the surface of the yarn layer (2) to obtain a basketball blank;
step four, putting the basketball blank into a spherical mould, closing the spherical mould, and putting the basketball blank into vulcanization equipment for vulcanization;
fifthly, trimming the vulcanized ball body and sticking a ball ridge line to obtain a basketball;
the vulcanization temperature in the fourth step is 110-120 ℃, and the vulcanization time is 25-30 min.
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| CN111073084B (en) * | 2019-12-07 | 2022-04-01 | 福建元吉体育用品有限公司 | Ball surface material and preparation method of ball surface |
| CN111171402A (en) * | 2020-01-17 | 2020-05-19 | 漳州华飞体育用品有限公司 | Rubber basketball outer skin and preparation method thereof |
| CN111467760A (en) * | 2020-04-23 | 2020-07-31 | 杨永悦 | Preparation process of tendon ditch furred basketball |
| CN111481890A (en) * | 2020-04-23 | 2020-08-04 | 杨永悦 | Manufacturing process of wave basketball |
| CN112546579A (en) * | 2020-12-21 | 2021-03-26 | 无锡市爱可赛体育用品有限公司 | High-elasticity basketball veneer and production process thereof |
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