KR102701381B1 - Functional shoes with outsoles made from recycled waste tires - Google Patents

Abstract

A functional shoe including an outsole made of recycled waste tires according to the present invention is characterized by including: a shoe body; an outsole made of recycled waste tires, the outsole having a plurality of groove groups having different shapes formed on the sole surface;
According to the functional shoe including an outsole made of recycled waste tires according to the present invention, by installing an outsole made of recycled waste tires, it is environmentally friendly and provides a carbon emission reduction function, and has the advantage of being able to faithfully meet consumer trends while enhancing grip.

Description

Functional shoes with outsoles made from recycled waste tires

The present invention relates to functional shoes including an outsole made from recycled waste tires. The present invention relates to functional shoes which can be used for various purposes such as weight lifting, mountaineering, and work, by manufacturing an outsole by recycling waste tires which have excellent grip and durability, and which are environmentally friendly and have the effect of reducing carbon emissions.

In modern life, shoes are required to have various functions beyond simply protecting the feet. In particular, grip is one of the important performances of shoes, and is essential to ensure safety on slippery surfaces. Shoes with enhanced grip are products that apply various technologies to meet these needs.

Shoes with enhanced traction are made by using high-friction materials, such as rubber, to increase the traction of the soles of the shoes.

Traditionally, the soles of shoes, or outsoles, are made of natural or synthetic rubber, but recently, there has been an increase in attempts to make environmentally friendly products using recycled rubber. These shoes are widely used not only for active purposes such as sports or mountaineering, but also to improve safety in everyday life.

However, traditional synthetic rubber or plastic materials use various chemicals during the manufacturing process, and these chemicals can be released into the environment during the production process, causing soil, water, and air pollution.

In addition, traditional synthetic rubber has the problem that it accelerates the depletion of the Earth's resources as it is made of chemicals extracted from non-renewable resources such as petroleum, and it does not meet the trend of consumers who increasingly prefer environmentally friendly products.

Korean Patent No. 2298592 discloses a multipurpose shoe sole with improved grip, which includes a sole body, a gripping projection formed in a specific pattern protruding on the lower surface of the sole body, an inclined projection formed protruding inwardly along the edge of the lower surface of the sole body and having an inclined surface slanted outwardly on the lower surface, and an inclined gripping projection formed protruding outwardly along the edge of the lower surface of the sole body and slanted outwardly to come into contact with the ground when weight is applied, thereby improving gripping power.

However, the above technology is expected to be manufactured using traditional manufacturing processes without applying any eco-friendly manufacturing methods, and as previously pointed out, it has the problems of environmental pollution, resource depletion, and failure to meet consumer needs.

Therefore, it is necessary to develop new and advanced functional shoes that can faithfully meet consumer trends while ensuring excellent grip and being used for various purposes such as weight lifting, mountaineering, and work, and reducing carbon emissions by applying eco-friendly materials and methods.

Domestic Patent No. 2298592

The present invention has been devised to overcome the problems of the above technology, and its main purpose is to provide a new and advanced functional shoe that can faithfully meet consumer trends as well as reduce carbon emissions by applying eco-friendly materials and methods while ensuring excellent grip so that it can be used for various purposes such as weight lifting, mountaineering, and work.

Another object of the present invention is to add a material that enhances the composite durability of the outsole.

In order to achieve the above object, a functional shoe including an outsole made of recycled waste tires according to the present invention is characterized by including a shoe body; an outsole made of recycled waste tires, the outsole having a plurality of groove groups having different shapes formed on the sole surface;

In addition, the home group is characterized by including a pair of first home groups extending in the longitudinal direction of the outsole with a predetermined width, a second home group extending in a grid-like matrix structure in an outer region of the first home, and a third home group extending in an X shape in a plurality of units at predetermined intervals along the longitudinal direction of the outsole in an inner region of the first home.

In addition, the outsole is characterized by including 80 to 90 parts by weight of recycled rubber manufactured from waste tire powder, and 10 to 20 parts by weight of an outsole reinforcing agent including nickel-molybdenum nanoparticles and hexaaluminate.

According to the functional shoe including an outsole made of recycled waste tire according to the present invention,

1) Equipped with an outsole made from recycled waste tires, it is environmentally friendly and provides a carbon emission reduction function, while also enhancing grip and faithfully meeting consumer trends.

2) It has the effect of ensuring excellent durability of the outsole.

Figure 1 is a conceptual diagram schematically illustrating the appearance of the functional shoe of the present invention.
Figure 2 is a conceptual diagram illustrating a piece of scrap tire.
Figure 3 is a conceptual diagram illustrating part of the manufacturing process of an outsole made from recycled waste tires.
Figure 4 is a conceptual diagram illustrating the advantages of manufacturing shoes using recycled waste tires.
Figure 5 is a conceptual diagram illustrating a state of wearing the shoes of the present invention and lifting weights.
Figure 6 is a conceptual diagram illustrating a home group of a shoe of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The attached drawings are not drawn to scale, and like reference numerals in each drawing indicate like components.

Figure 1 is a conceptual diagram schematically illustrating the appearance of the functional shoe of the present invention.

As can be seen from Fig. 1, the functional shoe of the present invention basically includes a shoe body (10) and an outsole (20), similar to known shoes.

The shoe body (10) of the present invention refers to the entire remaining portion of the shoe except for the outsole (20), and includes an upper that wraps around the instep and the side of the foot, an inner lining that is located inside the shoe, and an insole that directly contacts the sole of the foot. In addition, it is possible to include a lace that is a type of string for tying the shoe, and a heel counter that supports the heel.

These shoe bodies (10) can be manufactured in the same shape and purpose as shoes, but since the outsole (20) of the present invention, which will be described later, has the characteristic of having excellent grip, it is preferable to manufacture them as sneakers, training shoes, mountaineering sandals, or slippers in accordance with this purpose.

Since the detailed configuration of the shoe body (10) is the same as or similar to the known shoe, individual descriptions will be omitted.

The outsole (20) of the present invention, like a general outsole, occupies the lower part of the shoe and is a part that comes into direct contact with the ground, and has the special feature of being manufactured by recycling waste tires.

There are various methods for manufacturing an outsole (20) by recycling waste tires.

Figure 2 is a conceptual diagram illustrating a piece of scrap tire.

Referring to Fig. 2, a piece of waste tire cut to a predetermined size is prepared and then the same is extruded to produce an outsole (20).

At this time, it is possible to extrude and mold the waste tire pieces into thin sheets in the shape of sheets by laminating several layers so that a height corresponding to the thickness of the outsole (20) can be manufactured.

Furthermore, as another embodiment of manufacturing an outsole (20) based on a waste tire, it can be manufactured through a powder generation, recycled rubber manufacturing, and extrusion molding process.

Figure 3 is a conceptual diagram illustrating part of the manufacturing process of an outsole made from recycled waste tires.

First, the powder creation process involves collecting waste tires, then going through a preprocessing process to remove iron cores, scraps, and other impurities from the waste tires, a cutting process to cut the waste tires into small pieces, and a process to crush the cut small pieces into even smaller pieces, called powder, using a crusher.

After the waste tire powder is created in this way, it is also possible to wash it a second time to remove any remaining impurities.

The recycled rubber manufacturing process is a process of heating crushed waste tire powder to produce recycled rubber, and this process can restore the flexibility of the recycled rubber.

Additionally, it is also possible to form cross-links by adding a vulcanizing agent containing sulfur and a vulcanization accelerator to the recycled rubber.

Lastly, the extrusion molding process is a process of extruding regenerated rubber through an extruder into a desired thickness and shape, then putting the extruded regenerated rubber into a mold and molding it into the shape of an outsole (20).

During this process, it is possible to form multiple home groups together.

Additionally, the molded rubber can be heated at 140 to 160°C to promote a vulcanization reaction, and then the vulcanized rubber can be cooled to stabilize the final rubber properties.

Afterwards, unnecessary parts can be trimmed and removed after molding. FIG. 3 shows the state before the integral outsole (20) for a pair of left and right shoes (i.e., the outsole before separation) is extruded and then trimmed.

Finally, the quality of the outsole (20) can be inspected to check performance such as uniformity, durability, and grip.

The outsole (20) based on recycled waste tires completed through this process can be bonded to the shoe body (10) using an adhesive, and if necessary, the outsole (20) and the shoe body (10) can be subjected to a stitching process to ensure additional sturdiness.

Through this process, waste tires can be recycled to produce a shoe outsole (20) with excellent durability and functionality, which can provide an eco-friendly method that also contributes to environmental protection and resource conservation.

Figure 4 is a conceptual diagram illustrating the advantages of manufacturing shoes using recycled waste tires.

Referring to Figure 4, it can be seen that about 3 pairs of shoes can be produced per waste tire, which can achieve a carbon emission reduction effect of about 9 kg per pair.

In this way, by recycling waste tires to produce an outsole (20), it is possible to provide a unique feature that provides excellent grip while being environmentally friendly.

That is, general tires use natural rubber, such as latex extracted from rubber trees, or various synthetic rubbers, such as styrene-butadiene rubber (SBR), butyl rubber, neoprene, or nitrile rubber. Since these rubbers were originally used for automobile tires, they have higher grip than the outsoles used in general sneakers.

In other words, since the characteristics and design of tire rubber are made to provide optimal grip under various road conditions, it has the advantage of being able to utilize these characteristics even when recycled into an outsole (20) for shoes, as in the present invention.

Referring again to FIGS. 1 and 2, it can be seen that a plurality of home groups having different shapes are formed on the bottom surface of the outsole (20).

These home groups can have different shapes as well as different depths, for example, a first home group having a circular shape, a second home group having a linear shape, and a third home group having a zigzag shape.

These home groups can be arranged in specific patterns to provide balanced traction and stability.

Figure 5 is a conceptual diagram illustrating a state of wearing the shoes of the present invention and doing weight training.

As can be seen from Fig. 5, when performing weight movements such as deadlifts or Bulgarian split squats, it is most important for the outsole to not slip on the floor and to provide firm grip in order to ensure stability of the movement. Since the outsole of the present invention (20) is manufactured by recycling waste tires, it can be optimized for such weight use and can further be utilized for additional purposes such as mountaineering boots and ridge boots.

In summary, the functional shoes of the present invention are equipped with an outsole (20) made from recycled waste tires, so they are environmentally friendly, and they also have various functions such as excellent grip, anti-slip, and shock absorption, so they can be used as functional shoes for weight lifting, mountaineering, work, etc.

Figure 6 is a conceptual diagram illustrating a home group of a shoe of the present invention.

The home group of the present invention can be a combination of home groups having various shapes as described above, and presents a pattern for further strengthening the grounding force.

Specifically, as can be seen from FIG. 6, the home group of the present invention can include the first, second, and third home groups (40, 50, and 60).

The first home group (40) refers to a pair of grooves that extend in the length direction of the shoe, i.e. the outsole (20), with a certain width.

This first home group (40) strengthens the overall grip of the outsole (20), and provides stability when the wearer moves in various directions, especially when moving forward and backward, as well as increasing the bending and flexibility of the foot to ensure a function that helps with comfortable walking.

The second home group (50) refers to a home that is extended in a lattice-like matrix structure in the inner region of the first home. Here, "inner" can be understood to refer to an outer direction, that is, a direction toward the ring finger and little toe, when the first home group (40) spans the index and middle toes. Conversely, "outer" refers to a direction toward the big toe.

According to this second home group (50), a square block surrounded by grid-shaped grooves is formed, and on the surface of this block, a plurality of sub-grooves are formed along the formation direction of the first home group (40) with a certain width interval, so that additional contact area and frictional force can be secured.

This second home group (50) can be strengthened to maximize friction in various directions, thereby providing stability when the wearer moves in various directions and improving anti-slip performance.

The third home group (60) refers to a plurality of grooves that are inserted in an X shape at regular intervals along the length direction of the outsole (20) in the inner area of the first home.

In this third home group (60), as in the second home group (50), multiple sub-homes are formed to secure additional contact area and frictional force.

This third home group (60) is extended in a diagonal direction to strengthen lateral grip, thereby ensuring stability when the wearer moves sideways or is subject to lateral external force, and also has the advantage of maintaining grip when making sudden changes in direction or performing weight lifting while lifting heavy weights.

By forming various types of home groups in the outsole (20), it is possible to ensure the safety and comfort of the user through various functions such as anti-slip, enhanced grip, and shock absorption.

Furthermore, the outsole (20) can be manufactured not only from waste tire powder but also from natural rubber and synthetic rubber.

Specifically, the outsole (20) may include 50 to 70 parts by weight of recycled rubber manufactured from waste tire powder, 10 to 20 parts by weight of natural rubber, and 10 to 20 parts by weight of synthetic rubber.

Adding natural rubber and synthetic rubber to the recycled rubber manufactured from waste tire powder provides many advantages in improving the performance and characteristics of the outsole (20). Each type of rubber has its own unique characteristics, and mixing them can produce a synergistic effect.

Specifically, adding natural rubber can enhance excellent elasticity and flexibility, ensure excellent grip and coefficient of friction, and add the advantage of flexibility even in cold environments.

At this time, natural rubber can be made of polyisoprene obtained from latex extracted from the latex tree (Hevea brasiliensis).

In addition, the addition of synthetic rubber provides high resistance to chemicals, high temperature stability, and design flexibility, as well as the convenience of mass production and cost savings.

At this time, synthetic rubber can be applied, such as styrene-butadiene rubber (SBR), which has excellent wear resistance and heat stability and whose performance is improved when mixed with natural rubber, butadiene rubber (BR), which has excellent flexibility, or ethylene propylene diene monomer (EPDM), which has excellent oxidation resistance and heat resistance.

That is, by adding natural rubber and synthetic rubber to the recycled rubber, it can provide the advantages of a comfortable fit, flexibility, improved grip, and expanded use range of shoes with excellent environmental adaptability.

Furthermore, the outsole (20) may include a material other than natural rubber and synthetic rubber that can maximize the overall durability of the outsole (20).

Specifically, the outsole (20) may include 80 to 90 parts by weight of recycled rubber manufactured from waste tire powder and 10 to 20 parts by weight of an outsole reinforcing agent.

The outsole reinforcing agent is basically composed of nickel-molybdenum nanoparticles and hexaaluminate.

Nickel-molybdenum nanoparticles have a structure in which nickel (Ni) and molybdenum (Mo) atoms are combined into nanometer-sized particles. The combination of nickel and molybdenum enhances the mechanical strength of regenerated rubber, providing a function that greatly improves wear resistance and impact resistance.

In addition, it provides high heat resistance based on molybdenum, allowing the performance of recycled rubber to be maintained even at high temperatures, and its overall excellent corrosion resistance helps to maintain the performance of recycled rubber even in extreme chemical environments.

Hexaaluminate is an inorganic compound with a crystal structure in which aluminum (Al) and oxygen (O) atoms are bonded, and generally exists in the form of BaO·6Al2O3 or MgO·6Al2O3.

These hexaaluminates have high hardness, which significantly improves the wear resistance of the recycled rubber and ensures excellent impact resistance.

Additionally, it can help improve the physical properties of the recycled rubber by providing structural strength to the recycled rubber.

These outsole reinforcing agents have the advantage of greatly improving wear resistance and impact resistance, especially compared to combinations of natural rubber and synthetic rubber, and can additionally secure heat resistance and corrosion resistance.

In summary, by adding the outsole reinforcing agent of the present invention to recycled rubber, it is possible to provide properties that maximize overall durability, such as impact resistance, wear resistance, heat resistance, and corrosion resistance.
Hereinafter, in order to explain the properties according to various components of the outsole reinforcing layer of the present invention, the evaluation results of examples and comparative examples will be compared and explained.

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Example 1 is composed of the regenerated rubber of the present invention and the outsole reinforcing agent, and Comparative Examples 1 and 2 are composed of polyurethane itself and a component including polyurethane and alumina, which is a representative aluminum oxide.

<Example 1>

85 parts by weight of recycled rubber manufactured from waste tire powder, 5 parts by weight of nickel-molybdenum nanoparticles, and 10 parts by weight of hexaaluminate were mixed and then extrusion-molded to produce sample 1 having a rectangular shape with a thickness of 3.2 mm, a width of 12.7 mm, and a length of 63.5 mm, and sample 2 having a width and length of 100 mm and a thickness of 10 mm, respectively.

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<Comparative Example 1>

Sample 1, a rectangular sample having a thickness of 3.2 mm, a width of 12.7 mm, and a length of 63.5 mm, and Sample 2, a rectangular sample having a width and length of 100 mm and a thickness of 10 mm, were produced by extrusion molding 100 parts by weight of recycled rubber manufactured from waste tire powder.

<Comparative Example 2>

70 parts by weight of recycled rubber manufactured from waste tire powder, 15 parts by weight of polyisoprene rubber obtained from latex, and 15 parts by weight of styrene-butadiene rubber (SBR) were mixed and then extrusion-molded to produce sample 1 in the shape of a rectangle having a thickness of 3.2 mm, a width of 12.7 mm, and a length of 63.5 mm, and sample 2 having a width and length of 100 mm, and a thickness of 10 mm, respectively.

[Experiment 1: Impact resistance test]

Based on ASTM D256, each sample 1 was mounted on an Izod pendulum impact tester, and then a 5 kg pendulum was dropped from a height of 1 meter onto sample 1 to apply an impact.

The impact resistance energy required to destroy Sample 1 was measured in J.

Table 1 below shows the experimental results.

Example 1 Comparative Example 1 Comparative Example 2 Impact resistance energy (J) 15.2 10.3 12.8

As can be seen from Table 1 above, it can be seen that the impact resistance is excellent in the order of Example 1 - Comparative Example 2 - Comparative Example 1. In other words, it can be seen that Example 1 to which the outsole reinforcing layer of the present invention is applied exhibits excellent impact resistance.

[Experiment 2: Grounding Test]

The ASTM F609 standard provides a method for evaluating the traction of shoe soles on a variety of surfaces, and this test aims to measure the coefficient of friction of Sample 2 using a Horizontal Pull Slipmeter (HPS).

Sample 2 was placed on a metal surface and the test was performed, and the friction force was measured while Sample 2 was moved horizontally at 1 m/s.

The coefficient of friction was recorded by calculating the ratio of the measured friction force and the vertical load, and the average value was obtained by repeating the experiment 10 times for each sample 2.

Table 2 below shows the experimental results.

Example 1 Comparative Example 1 Comparative Example 2 Average coefficient of friction (μ) 0.85 0.60 0.76

As can be seen from Table 2 above, it can be seen that the grip strength is excellent in the order of Example 1 - Comparative Example 2 - Comparative Example 1. In other words, it can be seen that Example 1 to which the outsole reinforcing layer of the present invention is applied exhibits excellent grip strength.

As described so far, the configuration and operation of the functional shoe including the outsole made of recycled waste tire according to the present invention have been expressed in the above description and drawings, but this is merely described as an example, and the spirit of the present invention is not limited to the above description and drawings, and it goes without saying that various changes and modifications are possible within a scope that does not depart from the technical spirit of the present invention.

10: Shoe body 20: Outsole
40: Home Group 1 50: Home Group 2
60: Third Home Group

Claims (6)

As a functional shoe with an outsole made from recycled waste tires,
Shoe body;
An outsole made of recycled waste tires, with a plurality of groove groups having different shapes formed on the bottom surface;
The above outsole is,
80 to 90 parts by weight of recycled rubber manufactured from waste tire powder,
A functional shoe characterized by comprising 10 to 20 parts by weight of an outsole reinforcing agent including nickel-molybdenum nanoparticles and hexaaluminate. In paragraph 1,
The above outsole is,
A step of removing foreign substances from waste tires and then crushing them to create waste tire powder;
A step of manufacturing recycled rubber by heating the above waste tire powder, and
A functional shoe characterized by being manufactured through a step of extruding the above-mentioned recycled rubber to complete the outsole. In paragraph 1,
The above home group is,
A pair of first groove groups extending in the longitudinal direction of the above outsole with a certain width,
A second groove group extended in a lattice-like matrix structure in the outer region of the first groove, and
A functional shoe characterized in that it includes a third groove group formed in a plurality of X shapes at regular intervals along the length direction of the outsole in the inner area of the first groove. In paragraph 1,
The above outsole is,
A functional shoe characterized by comprising 50 to 70 parts by weight of recycled rubber manufactured from waste tire powder, 10 to 20 parts by weight of natural rubber, and 10 to 20 parts by weight of synthetic rubber. delete delete