Shock-absorbing and ventilating exhaust sole and preparation method thereof

Abstract

The application relates to the field of shoe processing, in particular to a shock-absorbing and air-exchanging exhaust shoe sole and a preparation method thereof. The shoe sole comprises a shoe body, a plurality of cavity structures are arranged in the shoe body and are communicated with each other, and the shoe body is prepared from raw materials in percentage by weight, i.e. EVA latex, polyurethane prepolymer, a chain extender, a dispersing agent, a processing aid and a filler. The filler is composed of one or more of expanded graphite, carbon nanotubes, island fibers and porous nanometer silicon dioxide. The filler is uniformly mixed with the polyurethane prepolymer and the EVA latex under the action of the dispersing agent and plays a synergistic role. With the assistance of the chain extender and the processing aid, the shoe sole prepared after processing has better buffering and shock-absorbing performance, wear resistance and durability, and the possibility of deformation of the cavity structure after long-term use is reduced. The comfort and durability of the shoe sole are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of shoe processing, more particularly, it relates to a shock-absorbing and ventilating exhaust sole and a preparation method thereof. BACKGROUND

[0002] In recent years, with the improvement of people's living standards and the enhancement of health consciousness, the demand for sports shoes is also increasing. In order to meet different sports needs and pursue more comfortable wearing experience, the design and manufacturing of sports shoes also tend to be fine and functional. Especially in the design of the sole, not only the cushioning and shock-absorbing performance should be considered, but also the wearing comfort, ventilation and durability should be paid attention to, which not only improves the sports performance of the wearer, but also improves the health properties of the sports shoes.

[0003] At present, in order to improve the shock-absorbing and ventilating performance of the sole, sports shoe manufacturers usually add a combination of multiple materials in the sole or change the structure of the sole. For example, elastic materials such as EVA, TPU, etc. are used to enhance the shock-absorbing effect of the sole, or air cushion structure is added to improve the cushioning performance of the sole; at the same time, air holes are set or special materials are used to enhance the ventilation performance of the sole. The application of the above structures or materials improves the overall performance of the sole to a certain extent.

[0004] However, the existing shock-absorbing and ventilating sole is mostly made of single material or provided with air holes in the local part of the sole, which is difficult to achieve good shock-absorbing and ventilating effect as a whole in actual use, especially after long time or high intensity exercise, the moisture in the shoe is not easy to discharge, which affects the wearing comfort and the durability of the sole. SUMMARY

[0005] In order to obtain better cushioning and shock-absorbing performance and wear resistance, and at the same time achieve better ventilation performance, improve the comfort and durability of the sole, the present application provides a shock-absorbing and ventilating exhaust sole and a preparation method thereof.

[0006] In the first aspect, the present application provides a shock-absorbing and ventilating exhaust sole, comprising a shoe body, a plurality of interconnected cavity structures are arranged in the interior of the shoe body, the shoe body is made of raw materials in percentage by weight: EVA latex 25-50%

[0007] Polyurethane prepolymer 24-50%

[0008] Chain extender 5-15%

[0009] Dispersing agent 1-8%

[0010] Processing aid 1-3%

[0011] Filling agent 1-20%;

[0012] The total weight percentage of the EVA latex, polyurethane prepolymer, chain extender, dispersant, processing aid, and filler is 100%;

[0013] The filler is composed of one or more of expanded graphite, carbon nanotubes, sea-island fibers, and porous nano-silica.

[0014] In the above technical solution, the formation of a cavity structure enables the sole to have excellent ventilation and shock absorption and cushioning effects. The shoe body uses a compound of EVA latex and polyurethane prepolymer, fully leveraging the synergistic effect of the two, improving the overall performance of the sole and giving it excellent elasticity and load-bearing capacity. The addition of one or more of expanded graphite, carbon nanotubes, sea-island fibers, and porous nano-silica as fillers enhances support and elasticity, effectively preventing deformation of the cavity structure during use, and ensuring effective ventilation and shock absorption.

[0015] Under the action of the dispersant, the filler is evenly dispersed in the EVA latex and polyurethane prepolymer, and the chain extender further extends the chain of the polyurethane prepolymer to enhance its elasticity. With the assistance of the processing aid, the prepared sole has high elasticity, excellent cushioning performance, outstanding wear resistance and breathability.

[0016] In summary, using one or more of expanded graphite, carbon nanotubes, sea-island fibers, and porous nano-silica as fillers provides enhanced support. Under the action of a dispersant, they are uniformly mixed with the polyurethane prepolymer and EVA latex, providing a synergistic effect and further improving overall performance. Furthermore, under the action of a chain extender, elasticity is further enhanced. With the aid of a processing aid, the processed sole exhibits superior cushioning and shock absorption performance, wear resistance, and durability, reducing the possibility of deformation of the cavity structure after long-term use. This improves the comfort and durability of the sole.

[0017] Preferably, the filler is composed of expanded graphite, sea-island fiber, and porous nano-silica in a weight ratio of (1-2.3): (0.3-1.2):1.

[0018] When expanded graphite, sea-island fiber, and porous nano-silica are compounded, a special filling structure is formed in the sole system. The synergistic effect makes the sole have better elasticity, wear resistance, and pressure resistance. At the same time, it interacts with polyurethane prepolymer and EVA latex to further improve the cushioning and shock absorption performance and wear resistance. During use, it reduces the deformation of the cavity structure, maintains a better ventilation effect, and improves the overall durability and comfort of the sole.

[0019] Preferably, the particle size of the expanded graphite is 10-30 microns, and the worm length is 50-180 microns.

[0020] Expanded graphite with a particle size of 10-30 microns and a worm length of 50-180 microns is preferably selected. It has softness, resilience, plasticity and filling and supporting effects, and is combined with polyurethane prepolymer and EVA latex to enhance the effect, so that the sole has better shock absorption effect, ventilation performance and wear resistance.

[0021] Preferably, the sea-island fiber has a diameter of 3-5D and a length of 0.5-1.5 mm.

[0022] Sea-island fibers of specific diameter and length are preferably selected to interact with polyurethane prepolymer and EVA latex to enhance the mechanical properties and comfort of the sole material, thereby improving the overall shock absorption effect, breathability and wear resistance.

[0023] Preferably, the particle size of the porous nano-silica is 50-500 nm, and the particle size of the carbon nanotube is 10-100 nm.

[0024] The particle size of porous nano-silica is controlled within the range of 50-500 nanometers, and the particle size of carbon nanotubes is controlled within the range of 10-100 nanometers. They can play a filling and reinforcing role in the polyurethane prepolymer and EVA latex system, effectively improving the cushioning and shock absorption performance, wear resistance and ventilation performance of the sole material.

[0025] Preferably, the dispersant is a polyethylene glycol solution or a silane coupling agent solution.

[0026] Polyethylene glycol solution or silane coupling agent solution is selectively selected as a dispersant, which effectively improves the dispersibility and compatibility of the filler in the raw material system of the sole material, and further improves the overall performance of the sole.

[0027] Preferably, the dispersant is prepared from the following raw materials in parts by weight:

[0028] Polyisobutylene succinimide 0.1-0.5 parts

[0029] 0.1-0.8 parts of polyethylene glycol

[0030] 1. 1-3 parts of isocyanate propylmethyldimethoxysilane

[0031] Methacryloylethyl sulfobetaine 0.5-1.5 parts

[0032] 0.01-0.03 parts of benzoyl peroxide

[0033] 5-8 parts of ethyl acetate.

[0034] The dispersant provided by the present invention effectively improves the dispersibility and compatibility of the filler in the sole material system by rationally mixing polyisobutylene succinimide, polyethylene glycol, 3-isocyanate propylmethyldimethoxysilane, methacryloylethyl sulfobetaine, and ethyl acetate. The active groups in the dispersant further react with the active groups of the polyurethane prepolymer or EVA latex, tightly bonding the filler to the raw material system of the sole material. Furthermore, during use, the filler reduces deformation of the cavity structure, maintains an optimal ventilation effect, and improves the overall durability and comfort of the sole.

[0035] Preferably, the dispersant is prepared by the following method:

[0036] Weigh 0.1-0.5 parts of polyisobutylene succinimide, 0.1-0.8 parts of polyethylene glycol, 1-3 parts of 3-isocyanate propylmethyldimethoxysilane, 0.5-1.5 parts of methacryloylethyl sulfobetaine, and 5-8 parts of ethyl acetate, and mix them evenly to obtain a dispersant.

[0037] Through the above method, preferably, the processing aid is one or more of an antioxidant, a release agent, a foaming agent, a defoaming agent, and a catalyst.

[0038] The processing aids are selected from one or more of antioxidants, release agents, foaming agents, defoaming agents, and catalysts, which can effectively improve the aging resistance of the sole material, facilitate demoulding, and help form a uniform foam structure, or reduce foam generation, and play a role in catalytic reactions, thereby further improving the shock absorption and ventilation performance of the sole.

[0039] In a second aspect, a method for preparing a shock-absorbing and ventilating ventilated shoe sole is provided, which is prepared by the following method:

[0040] Weigh 24-50% of polyurethane prepolymer, 5-15% of chain extender, and 1-3% of processing aid and mix them evenly with the mixture A. After the reaction, add 25-50% of EVA latex and mix evenly to obtain a shoe sole slurry.

[0041] The sole slurry is poured into the mold and solidified to form a sole embryo in the mold, and a plurality of interconnected cavity structures are formed inside the sole embryo to obtain the sole.

[0042] This preparation method ensures the formation of evenly distributed and interconnected cavities within the sole, improving the sole's shock absorption and ventilation properties. Furthermore, by precisely controlling the proportions and mixing order of the various components, it helps enhance the overall performance of the sole material, ensuring durability and comfort. Specifically, the preparation of Mixture A allows the filler and dispersant to be fully combined, further dispersing them into the sole slurry, contributing to the formation of a stable structure.

[0043] In summary, this application has the following beneficial effects:

[0044] 1. By setting up several interconnected cavity structures inside the shoe body, the overall shock absorption performance of the sole is effectively improved, while enhancing air circulation and improving wearing comfort;

[0045] 2. The reasonable ratio of EVA latex, polyurethane prepolymer and other additives makes the sole have better elasticity and durability, extending the service life of the sole;

[0046] 3. The selection and application of fillers further enhance the breathability and shock absorption effect of the sole, especially under long-term or high-intensity exercise conditions, which can effectively discharge moisture from the shoe and keep the shoe dry. DETAILED DESCRIPTION

[0047] The present application is further described in detail below with reference to the embodiments.

[0048] EVA latex, the manufacturer is preferably Changzhou Modern Chemical Co., Ltd., model MD-6062;

[0049] The polyurethane prepolymer is an aromatic polyisocyanate prepolymer with an NCO content of 3.6-4.2%, and is Deshimodu MDI polyester prepolymer MDQ24163;

[0050] The chain extender is 1,4-butanediol;

[0051] The sea-island fiber is composed of 60-80% polyamide and 20-40% polyester by mass;

[0052] The release agent is polyvinyl alcohol with a number average molecular weight of 1500-2000;

[0053] The blowing agent is blowing agent H (dinitrosopentamethylenetetramine);

[0054] The antioxidant was antioxidant 1010;

[0055] The catalyst is dibutyltin dilaurate.

[0056] Example 1

[0057] A shock-absorbing and ventilating venting sole comprises a shoe body, wherein a plurality of interconnected cavity structures are provided inside the shoe body, wherein the volume of the cavity structures accounts for 10% of the total area of ​​the sole, and the cavity structures are located on the side of the sole close to the human heel.

[0058] The exhaust sole is made by the following method:

[0059] According to weight percentage, 8% of filler and 1% of dispersant were weighed and mixed evenly to obtain mixture A;

[0060] 50% of polyurethane prepolymer, 30% of chain extender, and 1% of processing aid were weighed and mixed uniformly with the mixture A according to weight percentage. The mixture was heated to 75°C and reacted at a speed of 100 r / min for 3 hours. Then, 10% of EVA latex was added and stirred for 1 hour to fully mix the mixture to obtain a shoe sole slurry.

[0061] The sole slurry is placed in a vacuum degassing machine for degassing, and then poured into a sole mold. The mold is placed in a vulcanizer and pressurized to 30 MPa and heated to 115°C. After 10 minutes, a sole embryo is formed in the mold, and several interconnected cavity structures are formed inside the sole embryo. The sole embryo is taken out of the mold and placed at room temperature for 24 hours to obtain the sole.

[0062] The filler is expanded graphite with an average particle size of 10 microns and an average worm length of 50 microns. The dispersant is a polyethylene glycol solution, obtained by mixing polyethylene glycol with an average molecular weight of 1:1 with water in a weight ratio of 1:1. The processing aids include an antioxidant, a release agent, a foaming agent, and a catalyst in a weight ratio of 3:1:5:1.

[0063] Example 2-3

[0064] The difference between Example 2-3 and Example 1 is that the amounts of raw materials used are different, as shown in Table 1;

[0065] Table 1 Amount of raw materials used in Examples 1-3 (%)

[0066] raw material Example 1 Example 2 Example 3 EVA latex 25 30 40 Polyurethane prepolymer 50 37 24 Chain Extender 15 10 5 dispersants 1 5 8 Processing aids 1 2 3 Fillers 8 16 20

[0067] Example 4

[0068] The difference between Example 4 and Example 2 is that the filler is sea-island fiber, the diameter of the sea-island fiber is 3D, and the length is 0.5 mm.

[0069] Example 5

[0070] The difference between Example 5 and Example 2 is that the filler is carbon nanotubes, and the average particle size of the carbon nanotubes is 10 nm.

[0071] Example 6

[0072] The difference between Example 6 and Example 2 is that the filler is porous nano-silica, and the particle size of the porous nano-silica is 500 nm.

[0073] Example 7

[0074] Example 7 differs from Example 2 in that the filler is composed of expanded graphite and porous nanosilica in a weight ratio of 1:1; the particle size of the porous nanosilica is 500 nm; the average particle size of the expanded graphite is 10 microns, and the average length of the worm is 50 microns.

[0075] Example 8

[0076] Example 8 differs from Example 2 in that the filler is composed of expanded graphite, island fibers, and porous nanosilica in a weight ratio of 1:0.3:1, wherein the particle size of the porous nanosilica is 500 nm, the average particle size of the expanded graphite is 10 microns, the average length of the worm is 50 microns, the island fiber has a wire diameter of 3D and a length of 0.5 mm.

[0077] Example 9

[0078] Example 9 differs from Example 2 in that the filler is composed of expanded graphite, island fibers, and porous nanosilica in a weight ratio of 1.7:0.5:1, wherein the particle size of the porous nanosilica is 200 nm, the average particle size of the expanded graphite is 20 microns, the average length of the worm is 100 microns, the island fiber has a wire diameter of 4D and a length of 1 mm.

[0079] Example 10

[0080] Example 10 differs from Example 2 in that the filler is composed of expanded graphite, island fibers, and porous nanosilica in a weight ratio of 1.7:0.5:1, wherein the particle size of the porous nanosilica is 50 nm, the average particle size of the expanded graphite is 30 microns, the average length of the worm is 180 microns, the island fiber has a wire diameter of 5D and a length of 1.5 mm.

[0081] Example 11

[0082] Example 11 differs from Example 9 in that the dispersant is a silane coupling agent solution, which is obtained by uniformly mixing KH550 silane coupling agent and water in a weight ratio of 1:1.

[0083] Example 12

[0084] Example 12 differs from Example 9 in that the dispersant is prepared by the following method:

[0085] Polyisobutylene succinimide 0.1 kg, polyethylene glycol 0.8 kg, 3-isocyanate propyl methyl dimethoxy silane 3 kg, acryloyl ethyl sulfobetaine 0.5 kg, and ethyl acetate 5 kg are mixed, and stirred at a speed of 100 r / min for 10 min to obtain a dispersant.

[0086] Example 13

[0087] Example 13 differs from Example 12 in that the dispersant is prepared by the following method:

[0088] Polyisobutylene succinimide 0.4 kg, polyethylene glycol 0.5 kg, 3-isocyanatopropyl methyldimethoxysilane 2.5 kg, acryloyl ethyl sulfobetaine 0.8 kg, ethyl acetate 7 kg are mixed and stirred at 100 r / min for 10 min to obtain a uniform mixture.

[0089] Example 14

[0090] Example 14 differs from Example 12 in that the dispersant is prepared by the following method:

[0091] Polyisobutylene succinimide 0.5 kg, polyethylene glycol 0.1 kg, 3-isocyanatopropyl methyldimethoxysilane 1 kg, acryloyl ethyl sulfobetaine 1.5 kg, ethyl acetate 8 kg are mixed and stirred at 100 r / min for 10 min to obtain a uniform mixture.

[0092] Example 15

[0093] Example 15 differs from Example 14 in that the polyethylene glycol is replaced by an equivalent amount of polyisobutylene succinimide.

[0094] Example 16

[0095] Example 16 differs from Example 14 in that the 3-isocyanatopropyl methyldimethoxysilane is replaced by an equivalent amount of methacryloyl ethyl sulfobetaine.

[0096] Comparative Example

[0097] Comparative Example 1

[0098] Comparative Example 1 differs from Example 1 in that the EVA latex is replaced by an equivalent amount of polyurethane prepolymer.

[0099] Comparative Example 2

[0100] Comparative Example 2 differs from Example 1 in that the polyurethane elastomer and the chain extender are each replaced by an equivalent amount of EVA latex.

[0101] Comparative Example 3

[0102] Comparative Example 3 differs from Example 1 in that the dispersant is replaced by an equivalent amount of EVA latex.

[0103] Comparative Example 4

[0104] The difference between Comparative Example 4 and Example 1 is that the filler is nano-silicon dioxide.

[0105] Performance testing

[0106] The shoe sole slurries obtained in Examples 1-16 and 1-4 were placed in a vacuum degassing machine for degassing, then poured into a mold, placed in a vulcanizer, pressurized to 30 MPa, and heated to 115°C. After 10 minutes, corresponding test samples were formed in the mold. The test samples were removed from the mold and left at room temperature for 24 hours to obtain test samples for the following experiments.

[0107] Test method / test method Rebound rate: refer to GBT1681-2009 "Determination of rebound elasticity of vulcanized rubber" for testing the test sample.

[0108] Wear amount: Refer to GB / T1689-1998 "Determination of wear resistance of vulcanized rubber" for testing samples.

[0109] Compression set: Test samples in accordance with GB / T7759.2-2014 "Determination of compression set of vulcanized rubber or thermoplastic rubber".

[0110] Compression resistance: For the soles obtained in Examples 1-16 and 1-4, mark point A at the heel and measure the thickness of the sole at point A on the heel. Apply 200 kg of force evenly downward to the upper surface of the sole and maintain the pressure for 3 days at a temperature of 30°C and a humidity of 65%. After removing the force, place the soles steady for 30 minutes at a temperature of 30°C and a humidity of 65%. Measure the thickness of the sole at point A on the heel again and calculate the rate of change of the thickness before and after to obtain the compression resistance change rate. The compression resistance change rate is equal to the front thickness minus the rear thickness, multiplied by 100%. The greater the compression resistance change rate, the worse the compression resistance effect.

[0111] Table 2 Experimental data of Examples 1-16 and Comparative Examples 1-4

[0112]

[0113] Combining Example 1 with Comparative Examples 1-4 and Table 2, it can be seen that the wear amount and compressive resistance change rate of Comparative Examples 1-4 are higher than those of Example 1, while the rebound rate and compression permanent deformation rate are lower than those of Example 1. This shows that the use of the raw material system of the present application, in combination with each other, makes the overall performance of the sole better.

[0114] Combining Example 2 with Examples 8-10 and Table 2, it can be seen that the wear amount and compressive resistance change rate of Examples 8-10 are lower than those of Example 2, while the rebound rate and compression permanent deformation rate are higher than those of Example 2. This shows that the compounding of expanded graphite, sea-island fiber, and porous nano-silica has a synergistic effect, and combined with the raw material system of the sole material, a special support structure is formed, thereby improving the comprehensive performance of the sole.

[0115] Combining Examples 12-14 with Example 9 and Table 2, it can be seen that the wear amount and compressive resistance change rate of Examples 12-14 are lower than those of Example 9, while the rebound rate and compression permanent set rate are higher than those of Example 9. This shows that the compounding of polyisobutylene succinimide, polyethylene glycol, 3-isocyanatepropylmethyldimethoxysilane, and acryloylethyl sulfobetaine has a synergistic effect in promoting dispersion, and can improve the compatibility and dispersion uniformity of the filler in the raw material system, thereby further improving the overall performance of the sole.

[0116] Combining Examples 15-16 with Example 12 and Table 2, it can be seen that the wear amount and compressive resistance change rate of Examples 15-16 are higher than those of Example 12, while the rebound rate and compression permanent deformation rate are lower than those of Example 12, indicating that the compounding of polyisobutylene succinimide, polyethylene glycol, 3-isocyanate propylmethyldimethoxysilane, and acryloylethyl sulfobetaine has a better synergistic effect, so that it can be fully mixed with the raw material system of the sole, further improving the cushioning and shock absorption performance and wear resistance of the sole, maintaining a better ventilation effect, and improving the comfort and durability of the sole.

[0117] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A shock-absorbing and ventilating sole, comprising a shoe body, characterized in that: The shoe body is provided with a plurality of interconnected cavity structures, and the shoe body is made of raw materials in the following weight percentages: EVA latex 25-50% Polyurethane prepolymer 24-50% Chain extender 5-15% Dispersant 1-8% Processing aids 1-3% Filler 1-20%; The total weight percentage of the EVA latex, polyurethane prepolymer, chain extender, dispersant, processing aid, and filler is 100%; The filler is composed of expanded graphite, sea-island fiber, and porous nano-silica in a weight ratio of (1-2.3): (0.3-1.2): 1; The dispersant is prepared from the following raw materials in parts by weight: Polyisobutylene succinimide 0.1-0.5 parts 0.1-0.8 parts of polyethylene glycol 1-3 parts 3-isocyanatepropylmethyldimethoxysilane Methacryloylethyl sulfobetaine 0.5-1.5 parts 5-8 parts of ethyl acetate.

2. The shock-absorbing and ventilating sole according to claim 1, characterized in that: The particle size of the expanded graphite is 10-30 microns, and the worm length is 50-180 microns.

3. The shock-absorbing and ventilating sole according to claim 1, characterized in that: The sea-island fiber has a diameter of 3-5D and a length of 0.5-1.5 mm.

4. The shock-absorbing and ventilating sole according to claim 1, characterized in that: The particle size of the porous nano-silica is 50-500 nm.

5. The shock-absorbing and ventilating sole according to claim 1, characterized in that: The dispersant is prepared by the following method: Weigh 0.1-0.5 parts of polyisobutylene succinimide, 0.1-0.8 parts of polyethylene glycol, 1-3 parts of 3-isocyanate propylmethyldimethoxysilane, 0.5-1.5 parts of methacryloylethyl sulfobetaine, and 5-8 parts of ethyl acetate, and mix them evenly to obtain a dispersant.

6. The shock-absorbing and ventilating sole according to claim 1, characterized in that: The processing aid is one or more of an antioxidant, a mold release agent, a foaming agent, a defoaming agent, and a catalyst.

7. A method for preparing the shock-absorbing and ventilating ventilating sole according to any one of claims 1 to 6, characterized in that: Prepared by the following method: Weigh the filler and the dispersant according to weight percentage and mix them evenly to obtain a mixture A; According to weight percentage, 24-50% of polyurethane prepolymer, 5-15% of chain extender, and 1-3% of processing aid are weighed and mixed evenly with the mixture A. After the reaction, 25-50% of EVA latex is added and mixed evenly to obtain a shoe sole slurry; The sole slurry is poured into the mold and solidified to form a sole embryo in the mold, and a plurality of interconnected cavity structures are formed inside the sole embryo to obtain the sole.

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