KR20240045646A - Outsole with improved abrasion resistance by grafting carbon fiber and method for manufacturing the same - Google Patents

Abstract

The present invention relates to an outsole with improved wear resistance by grafting carbon fiber and a manufacturing method thereof, comprising: an outsole body having an upper and lower surface; A first sole made of rubber and carbon fiber material formed on the lower surface of the outsole body at a position corresponding to the rear foot; A plurality of second soles are formed at positions corresponding to the forefoot and midfoot on the lower surface of the outsole body, are spaced apart at regular intervals along the longitudinal direction of the outsole body, and are made of a rubber material. ; and a plurality of third bottom portions disposed between the plurality of second bottom portions and made of a rubber material. As a result, by manufacturing an outsole containing carbon fiber, wear resistance can be improved through carbon fiber while maintaining the rubber elasticity of the outsole and friction on dry ground, and the carbon fiber destroys the water film between the ground and the outsole, thereby protecting the floor or It has the effect of improving slip resistance on slippery surfaces such as ice.

Description

Outsole with improved abrasion resistance by grafting carbon fiber and method for manufacturing the same {Outsole with improved abrasion resistance by grafting carbon fiber and method for manufacturing the same}

The present invention relates to an outsole with improved abrasion resistance by grafting carbon fiber and a manufacturing method thereof. More specifically, the present invention relates to an outsole containing carbon fiber, which maintains the rubber elasticity of the outsole and friction on dry ground while maintaining the elasticity of the rubber on the outsole and the manufacturing method thereof. An outsole with improved abrasion resistance and a manufacturing method thereof by incorporating carbon fiber, which can improve abrasion resistance and improve slip resistance on slippery surfaces such as floors or ice by destroying the water film between the ground and the outsole with carbon fiber. It's about.

The outsole, which corresponds to the sole of a shoe, is generally manufactured by foaming and molding rubber or polyurethane, and the outsole must have a certain amount of elasticity and shock absorption so that the wearer of the shoe does not feel uncomfortable. do. In particular, in the case of tennis shoes, basketball shoes, badminton shoes, hiking shoes, and walking shoes, abrasion resistance is greatly required to prevent shortening of the service life of the outsole due to frequent friction with the ground. Additionally, along with elasticity, shock absorption, and abrasion resistance, slip resistance to prevent slipping off the ground, and chemical resistance to prevent physical properties from changing from various contaminants are additionally required.

In particular, recently, due to the rapid improvement in living standards, corridors and stairs in all spaces where people live, buildings, underground passages, etc., are being constructed using marble or various types of tiles. Accordingly, accidents resulting in fractures due to slipping frequently occur during daily life, and safety accidents resulting in fractures due to slipping easily also occur on frozen icy surfaces or floors where ice has melted and formed a water film.

Therefore, in order to solve the above problems, a technology is known to increase slip resistance to prevent slipping on the ground by roughening the surface of the outsole or manufacturing the outsole in a direction to increase the hardness of the outsole. However, when the surface of the outsole is manufactured to be rough in order to increase slip resistance, there is a problem in that the wear resistance is reduced, such as the service life of the outsole being shortened due to friction with the surface. Therefore, it is necessary to develop an outsole that has both excellent slip resistance and wear resistance.

Korea Intellectual Property Office Registered Patent No. 10-2092723

The present invention was developed to solve the above problems, and by manufacturing an outsole containing carbon fiber, wear resistance can be improved through carbon fiber while maintaining the rubber elasticity of the outsole and friction on dry ground, and carbon fiber The purpose is to provide an outsole with improved abrasion resistance and a manufacturing method thereof by grafting carbon fiber, which can improve slip resistance from slippery surfaces such as floors or ice by destroying the water film between the ground and the outsole.

The above object is an outsole body having an upper and lower surface; A first sole made of rubber and carbon fiber material formed on the lower surface of the outsole body at a position corresponding to the rear foot; A plurality of second soles are formed at positions corresponding to the forefoot and midfoot on the lower surface of the outsole body, are spaced apart at regular intervals along the longitudinal direction of the outsole body, and are made of a rubber material. ; and a plurality of third bottom parts disposed between the plurality of second bottom parts spaced apart from each other and made of a rubber material. This is achieved by an outsole with improved wear resistance by grafting carbon fiber.

Here, the second bottom part is preferably formed of a rubber-carbon mixture in which the rubber is mixed with carbon fiber, and the third bottom part is preferably formed in a herringbone pattern.

Additionally, the carbon fiber preferably has a length of 6 mm.

The above object also includes a rubber mixture preparation step of preparing a rubber mixture of natural rubber, butadiene rubber, and nitrile butadiene rubber; A carbon fiber and additive mixing step of mixing carbon fiber and additives with the rubber mixture to form a rubber-carbon mixture; A sheet forming and carbon fiber spraying step of forming a sheet using the rubber-carbon mixture and spraying the carbon fiber on the surface of the sheet; And a sheet compression molding step of manufacturing an outsole by compression molding the sheet; It is also achieved by a method of manufacturing an outsole with improved wear resistance by grafting carbon fiber, which includes a.

As described above, according to the present invention, by manufacturing an outsole containing carbon fiber, abrasion resistance can be improved through carbon fiber while maintaining the rubber elasticity of the outsole and the friction force on dry ground, and the carbon fiber provides a barrier between the ground and the outsole. By destroying the water film, it has the effect of improving slip resistance on slippery surfaces such as floors or ice.

Figure 1 is a photograph of an outsole with improved wear resistance by grafting carbon fiber according to an embodiment of the present invention.
Figure 2 is a flowchart of a method for manufacturing an outsole with improved wear resistance by grafting carbon fiber according to an embodiment of the present invention;
Figure 3 is a detailed flowchart of the carbon fiber and additive mixing step in the outsole manufacturing method,
Figures 4 to 6 are test reports showing the test results of the outsole.

Hereinafter, the technical idea of the present invention will be described in more detail using the attached drawings. The attached drawings are merely examples to illustrate the technical idea of the present invention in more detail, so the technical idea of the present invention is not limited to the form of the attached drawings.

Figure 1 is a photograph of an outsole with improved abrasion resistance by grafting carbon fiber according to an embodiment of the present invention, Figure 2 is a flowchart of a method of manufacturing an outsole with improved wear resistance by grafting carbon fiber according to an embodiment of the present invention, and Figure 3 is a detailed flow chart of the carbon fiber and additive mixing step in the outsole manufacturing method, and Figures 4 to 6 are test reports showing the test results of the outsole.

The outsole 10, which has improved wear resistance by grafting carbon fiber according to an embodiment of the present invention, includes an outsole body 100, a first bottom portion 200, a second bottom portion 300, and It includes a third bottom portion 400.

First, the outsole body 100 is composed of a plate shape similar to the foot of the wearer wearing the shoe, and has an upper and lower surface. Here, the upper surface of the outsole body 100 refers to the surface facing the wearer's foot, and the lower surface of the outsole main body 100 refers to the surface facing the ground. This outsole body 100 is manufactured from a rubber mixture of several types of rubber. Among several types of rubber, in the present invention, a rubber mixture obtained by mixing natural rubber, butadiene rubber, and nitrile butadiene rubber is used to form the outsole body (100). ) is manufactured.

Natural rubber refers to a rubber material obtained from natural plants, and is manufactured by collecting latex containing rubber powder called latex from rubber trees and then drying the latex. It is preferable to mix 5 to 10 parts by weight of natural rubber, but if the amount of natural rubber is less than 5 parts by weight, the elasticity is not excellent and an outsole with high hardness is produced, which can be a factor in increasing wear resistance. In addition, if the content of expensive natural rubber exceeds 10 parts by weight, it is an undesirable content because the manufacturing cost for manufacturing the outsole increases.

Butadiene rubber is a synthetic rubber made by polymerizing butadiene obtained from acetylene, and has excellent heat resistance and corrosion resistance, making it a suitable material for use in the outsole body (100). This butadiene rubber is preferably included in an amount of 20 to 30 parts by weight, which accounts for the largest proportion of the rubber mixture. If the butadiene rubber is less than 20 parts by weight, the heat resistance and corrosion resistance that meet the basic requirements of the outsole body 100 are poor. , if it exceeds 30 parts by weight, the effect of each rubber is not balanced because it is added in an excessive amount compared to natural rubber and nitrile butadiene rubber.

Nitrilebutadiene rubber is a synthetic rubber made by copolymerizing acronitrile and butadiene. It has excellent stain resistance and can withstand water and oil, but is not as good in processability as natural rubber and butadiene rubber. It should contain a low content of 2 to 5 parts by weight. If the nitrile butadiene rubber is less than 2 parts by weight, the contamination resistance of the outsole body 100 will be insufficient, and if it exceeds 5 parts by weight, the processability of the outsole body 100 will be poor, making it impossible to form the outsole body 100 of the desired shape. There will be no more.

The optimal content of this rubber mixture is 6 parts by weight of natural rubber, 26 parts by weight of butadiene rubber, and 4 parts by weight of nitrile butadiene rubber, respectively, but is not limited thereto.

The first bottom portion 200 is formed at a position corresponding to the rear foot on the lower surface of the outsole body 100 and is made of a rubber-carbon mixture of rubber and carbon fiber materials. In detail, the first bottom portion 200 is formed at a corresponding position so that the rearfoot portion, commonly called the heel, is seated on the lower surface of the outsole body 100. That is, when the wearer wears shoes and moves on the ground, the first bottom portion 200 is formed at a position that directly touches the ground when the wearer's heel touches the ground. This first bottom portion 200 is made of rubber and carbon fiber materials. In the case of rubber, it corresponds to the rubber mixture used to manufacture the outsole body 100, and carbon fiber with a length of 6 mm is added to the rubber mixture. The first bottom portion 200 is manufactured.

Carbon fiber is added to increase the wear resistance and slip resistance of the first bottom portion 200. In the case of carbon fiber, it has higher strength than the rubber mixture and has a rough surface. When such carbon fiber is manufactured into the first bottom portion 200 together with the rubber mixture, the carbon fiber is formed on the inside and surface of the first bottom portion 200. It is located. The carbon fibers present inside the first bottom portion 200 are entangled with the rubber mixture and serve to increase the durability of the first bottom portion 200, and the carbon fibers present on the surface of the first bottom portion 200 are It causes friction with the ground. In this way, when the first bottom portion 200 generates friction with the ground, the strength of the carbon fiber is higher than that of the rubber mixture, so wear of the carbon fiber is minimized and the wear resistance of the first bottom portion 200 increases. In other words, if only the rubber mixture exists, it is easily worn out by friction with the ground, but if carbon fiber is included, not only does the worn area decrease, but the carbon fiber comes into contact with the ground first, preventing the rubber mixture from wearing out. Do it.

In addition, when carbon fiber is included in the surface of the first bottom portion 200, slip resistance when moving on the ground can be prevented due to the carbon fiber having a rough surface compared to the rubber mixture, thereby increasing slip resistance. In addition, by destroying the water film that may exist between the ground and the first bottom part 200 using carbon fiber, it is possible to improve the grip between the ground and the first bottom part 200 from water film or ice, etc. The lifespan of the bottom portion 200 can be increased.

Here, the carbon fiber is preferably selected from the group consisting of PAN-based carbon fiber, PITCH-based carbon fiber, carbon chop, milled carbon, and mixtures thereof, but is not limited thereto.

PAN-based carbon fiber refers to carbon fiber made from PAN (poly acrylo nitrile) as a raw material, and is divided into regular tow type and large tow type. Among these, the regular tow type consists of 1,000 to 24,000 single fibers constituting the fiber bundle, and is classified as an excellent high-performance grade with high mechanical properties as it corresponds to carbon fiber with relatively thin fiber bundles. The large tow type is a fiber bundle of more than 40,000 single yarns and corresponds to carbon fiber that can be used for general purposes.

PITCH-based carbon fiber is a carbon fiber that is classified into anisotropic type and isotropic type depending on the characteristics of the raw material pitch. It is manufactured using pitch from oil or coal as a raw material.

These carbon fibers have a length of 6 mm, and are preferably mixed in an amount of 0.5 to 1 part by weight. If the length of the carbon fiber is less than 6mm, it is difficult to increase the durability of the first bottom part 200 and the wear resistance and slip resistance of the surface due to the short length, and if it exceeds 6mm, the carbon fibers clump together to make a high-quality product. There is a problem that the bottom part 200 cannot be manufactured. In addition, if carbon fiber is added in less than 0.5 parts by weight, the amount added is not sufficient, making it difficult to increase wear resistance and slip resistance, and if it exceeds 1 part by weight, the first bottom portion (200) is hard due to the high rigidity due to the rubber mixture. ) has the disadvantage that it becomes inconvenient for users to use.

In other words, since the first bottom part 200 is the part that causes the most friction with the ground when the wearer moves on the ground, it is manufactured using a material mixed with a rubber mixture and carbon fiber to prevent the first bottom part 200 from wearing out. Do your best to minimize this. This first bottom portion 200 may be formed in a water drop shape composed of curved lines and straight lines, but is not limited thereto.

The second bottom portion 300 is formed at a position corresponding to the forefoot and midfoot on the lower surface of the outsole body 100 and is constant along the longitudinal direction of the outsole body 100. They are placed at intervals and are made of rubber material. Here, the forefoot and midfoot correspond to the toes and sole of the wearer's foot excluding the heel, and the second sole 300 is a first sole 200 located in the rearfoot, which is the heel, of the lower surface of the outsole body 100. ) corresponds to the configuration formed overall on the lower surface of the outsole body 100, excluding.

These second bottom portions 300 are arranged to be spaced apart at regular intervals along the longitudinal direction of the outsole body 100. In detail, the second bottom portion 300 is arranged in a horizontal direction with respect to the longitudinal direction of the outsole body 100. They are arranged at regular intervals in a long shape or in a stacked shape. At this time, one second bottom portion 300 is made up of rectangular shapes connected to each other like stairs, and a plurality of second bottom portions 300 formed horizontally in the shape of steps are located on the lower surface of the outsole body 100 at regular intervals. are placed at a distance from

Here, the second bottom portion 300 may be formed of the same rubber mixture as the outsole body 100, but is manufactured from the same material as the first bottom portion 200 to prevent wear and slip through the second bottom portion 300. It is more desirable to make prevention possible. That is, the second bottom portion 300 is preferably formed of a rubber-carbon mixture obtained by adding carbon fibers having a length of 6 mm to a rubber mixture made of the same material as the first bottom portion 200.

The third bottom portion 400 is composed of a plurality of components disposed between the plurality of second bottom portions 300 spaced apart from each other, and is made of a rubber material. That is, the plurality of third bottom portions 400 are arranged between the plurality of second bottom portions 200 and arranged alternately with each other, and are specifically located on the forefoot and midfoot portions of the outsole body 100. The second bottom part 300 - the third bottom part 400 - the second bottom part 300 - the third bottom part 400 - are arranged alternately at corresponding positions. This third bottom portion 400, like the second bottom portion 300, is made up of rectangular shapes connected to each other like steps, and in addition, the third bottom portion 400 has a herringbone pattern to increase slip resistance. (herringborn pattern) is formed. In the case of the third bottom part 400, unlike the second bottom part 300, it does not contain carbon fiber and is formed only of a rubber mixture material, so a separate herringbone pattern is added to prevent sliding by the second bottom part 300. Help prevent problems.

In this way, the first bottom portion 200 and the second bottom portion 300 disposed at the lower part of the outsole body 100 of the present invention can improve wear resistance and slip resistance by grafting carbon fiber, and the first bottom portion 200 and the second bottom portion 300 are grafted with carbon fiber. Unlike the portion 200 and the second bottom portion 300, the third bottom portion 400 to which carbon fiber is not grafted can improve slip resistance by forming a herringbone pattern. That is, because the first bottom portion 200, the second bottom portion 300, and the third bottom portion 400 improve slip resistance in different ways, the slip resistance is improved compared to the case where only a material grafted with carbon fiber exists. Slip properties can be further improved.

The method of manufacturing the outsole 10 with improved wear resistance by grafting carbon fiber of the present invention corresponds to a method of manufacturing the first and second bottom portions of the outsole made of a rubber mixture and a carbon fiber material, which is shown in Figure 2 As shown, it includes a rubber mixture preparation step (S100), a carbon fiber and additive mixing step (S200), a sheet forming and carbon fiber spraying step (S300), and a sheet compression molding step (S400).

First, the rubber mixture preparation step (S100) refers to the step of preparing a rubber mixture of natural rubber, butadiene rubber, and nitrile butadiene rubber.

In order to obtain the rubber that accounts for most of the first bottom portion 200 and the second bottom portion 300, various types of rubber are mixed to form a rubber mixture. Among the various types of rubber, the present invention includes natural rubber, butadiene rubber, and Nitrile butadiene rubber is mixed to form a rubber mixture. The optimal content of this rubber mixture is 6 parts by weight of natural rubber, 26 parts by weight of butadiene rubber, and 4 parts by weight of nitrile butadiene rubber, respectively, but is not limited thereto.

In some cases, the rubber mixture may be used to manufacture not only the first bottom portion 200 and the second bottom portion 300, but also the outsole body 100 and the third bottom portion 400.

The carbon fiber and additive mixing step (S200) refers to the step of mixing carbon fiber and additives with the rubber mixture to form a rubber-carbon mixture. As shown in FIG. 3, this carbon fiber and additive mixing step (S200) includes a carbon fiber preparation step (S210), a carbon fiber surface modification step (S220), and a carbon fiber and additive input step (S230).

The carbon fiber preparation step (S210) refers to the step of preparing 6 mm long carbon fiber.

Carbon fiber is added to increase the wear resistance and slip resistance of the first bottom part 200 and the second bottom part 300. It has higher strength than the rubber mixture and has a rough surface, so the first bottom part 200 And the wear resistance and slip resistance of the second bottom portion 300 can be increased.

These carbon fibers have a length of 6 mm, and are preferably mixed in an amount of 0.5 to 1 part by weight. If the carbon fiber is made to a length of less than 6 mm, it is difficult to increase the durability of the first bottom portion 200 and the second bottom portion 300 and increase the wear resistance and slip resistance of the surface due to the short length. In this case, there is a problem in that the first bottom portion 200 and the second bottom portion 300 of good quality cannot be manufactured by clumping together the carbon fibers. In addition, if carbon fiber is added in less than 0.5 parts by weight, the amount added is not sufficient, making it difficult to increase wear resistance and slip resistance, and if it exceeds 1 part by weight, the first bottom portion (200) is hard due to the high rigidity due to the rubber mixture. ) and the second bottom portion 300 are manufactured, which has the disadvantage that it becomes inconvenient for the user to use.

The carbon fiber surface modification step (S220) refers to a step of modifying the surface of the carbon fiber through plasma treatment and silane treatment.

Surface modification of carbon fiber is performed to uniformly disperse the carbon fiber while improving the interfacial adhesive strength between the carbon fiber and the rubber mixture. If carbon fiber is mixed with the rubber mixture as is without surface modification, a problem may occur where the carbon fiber does not mix with the rubber mixture and the carbon fibers clump together. Therefore, the carbon fiber is surface modified so that it can be easily dispersed in the rubber mixture. .

In the case of carbon fiber, since it does not contain hydroxyl groups (-OH) on the surface, it is difficult to expect an effect of increasing the interfacial strength even if silane treatment is applied directly to it. Therefore, various methods such as cleaning, oxidation treatment, and polymerization can be used to impart hydroxyl groups to carbon fiber, but among them, plasma treatment is used, which can easily generate hydroxyl groups in a short time while generating almost no by-products. It is desirable. Therefore, the carbon fiber is first subjected to plasma treatment to obtain activated carbon fiber with an activated surface, which is then subjected to silane treatment.

In the case of plasma treatment conditions for carbon fiber, plasma treatment is performed at 1,000 to 1,500 W for 30 seconds to 3 minutes. If plasma treatment is performed at less than 1,000 W or for less than 30 seconds, hydroxyl groups are not sufficiently generated on the surface of the carbon fiber. Therefore, even with silane treatment, the effect of increasing the interfacial adhesion strength is minimal, and if plasma treatment is performed at 1,500 W or for more than 3 minutes, the surface of the carbon fiber will not be activated and the entire carbon fiber will be burned or carboxyl groups (carboxylic groups) will be formed beyond the generation of hydroxy groups. -COOH) may be generated, causing problems with changes in traits. When plasma treatment is performed in this way, activated carbon fibers with hydroxyl groups generated on the surface can be obtained. The most desirable plasma processing conditions are to use atmospheric air plasma, input voltage is 220±10%, single phase [VAC], plasma output is 1,000 [Watt], plasma The processing jig head size is 40 pi (mm), and the carbon fiber plasma processing time is 1 minute.

Next, the process of treating activated carbon fiber with silane using a silane coupling agent is a method of surface modifying carbon fiber by mixing a silane coupling agent, which forms a strong chemical bond with a material having hydroxy groups on the surface, with the activated carbon fiber. It consists of At this time, the organic functional group of silane forms an interpenetration polymer network (IPN), which is a physical cross-linking with the rubber mixture, increasing the interfacial adhesion strength of the rubber mixture, which is difficult to chemically bond.

As a silane treatment method, 1 to 5 parts by weight of a silane coupling agent is added to 100 parts by weight of acetic acid aqueous solution at pH 4.2, stirred for 1 hour to form an aqueous silane solution, and activated carbon fibers are immersed in this for 20 to 60 minutes. Then, it is taken out and dried in an oven at 80 to 130°C for 1 hour to obtain surface-modified carbon fiber.

The carbon fiber and additive input step (S230) refers to the step of forming a rubber-carbon mixture by adding and mixing the surface-modified carbon fiber and additives into the rubber mixture.

The carbon fiber and additives from the carbon fiber surface modification step (S220) are added to the rubber mixture obtained through the rubber mixture preparation step (S100), and then placed in a stirrer and stirred to form a uniformly mixed rubber-carbon mixture. In the case of the stirrer, the temperature is set to 50 to 60°C, and then the rubber mixture, carbon fiber and additives are added and stirred for 10 to 20 minutes to obtain a rubber-carbon mixture to form an outsole.

Here, the additives include 2.3 parts by weight of zinc oxide to fuse the rubber-carbon mixture, 0.35 parts by weight of stearic acid to prevent the manufactured outsoles from sticking together, 1.6 parts by weight of polyethylene glycol to increase and disperse viscosity, and a rubber mixture with inorganic properties. 1 part by weight of silane coupling agent for mixing between additives, 1 part by weight of abrasive agent to increase wear resistance, 1.5 parts by weight of rubber compounding oil to adjust the elasticity of the outsole, 0.15 parts by weight of 2-mercaptobenzothiazole Add 0.4 parts by weight of dibenzothiazyl disulfide and 0.04 parts by weight of tetramethyl thiuram disulfide. These additives correspond to components that must be included to form an outsole using a rubber mixture.

The sheet forming and carbon fiber spraying step (S300) refers to forming a sheet using a rubber-carbon mixture and spraying carbon fiber on the surface of the sheet.

In order to form a sheet to be used in the manufacture of the first bottom portion 200 and the second bottom portion 300 using the rubber-carbon mixture, sulfur is added to the rubber-carbon mixture and then uniformly distributed using an open roll mill. After being well dispersed, the rubber-carbon mixture is formed into a sheet shape. At this time, sulfur is added to harden the rubber-carbon mixture and is mixed in an amount of 0.6 to 1 part by weight. If sulfur is added in less than 0.6 parts by weight, the rubber-carbon mixture does not cure properly, and if it exceeds 1 part by weight, the rubber-carbon mixture hardens while being formed into a sheet shape, making it impossible to obtain a sheet of the desired thickness and shape. Additionally, the rotation speed of the open roll mill is 20 times/min, and the rolling temperature is preferably set to 50 to 90°C.

In this way, while forming a sheet using a rubber-carbon mixture, a process of spraying carbon fibers on the surface of the sheet is performed. In detail, an open roll mill is used to position carbon fibers to be sprayed on the upper part of the roller forming the sheet, and carbon fibers are sprayed on the upper part of the rolled sheet so that the carbon fibers are positioned on the surface of the sheet. This is to further increase the slip resistance and abrasion resistance of the carbon fiber by exposing the carbon fiber from the surface of the outsole. In this way, it is preferable to spray 0.1 to 0.2 parts by weight of carbon fiber so that the carbon fiber is located on the surfaces of the first bottom part 200 and the second bottom part 300.

The sheet compression molding step (S400) refers to the step of manufacturing an outsole by compression molding a sheet.

The sheet manufactured through the sheet forming and carbon fiber spraying step (S300) is compression molded at 110 to 120°C at a pressure of 50 to 100 kg/cm2 to manufacture the first bottom portion 200 and the second bottom portion 300. do. In the case of the sheet, it is obtained by simply rolling a rubber-carbon mixture, and in this state, the sheet goes through a process of compression molding so that it can be used as the first bottom part 200 and the second bottom part 300. At this time, some of the carbon fibers present on the surface of the sheet penetrate into the sheet during the sheet compression molding process to ensure that it is firmly fixed. That is, through compression molding of the sheet, a portion of the length of the carbon fiber is exposed to the surfaces of the first bottom portion 200 and the second bottom portion 300, and the remaining region is exposed to the first bottom portion 200 and the second bottom portion 300. By being inserted into the bottom portion 300, the carbon fiber may be manufactured to be stably fixed without being separated from the first bottom portion 200 and the second bottom portion 300.

Next, the compression molded sheet can be finally manufactured into the form of the first bottom portion 200 and the second bottom portion 300 through washing, drying, and cutting.

Hereinafter, embodiments of the present invention will be described in more detail.

<Example>

A rubber mixture is prepared by mixing 6 parts by weight of natural rubber, 26 parts by weight of butadiene rubber, and 4 parts by weight of nitrile butadiene rubber, and then mixed with 0.66 parts by weight of surface-modified carbon fibers having lengths of 1 mm, 3 mm, and 6 mm, respectively. Next, as additives to the rubber mixture, 0.35 parts by weight of stearic acid, 1.6 parts by weight of polyethylene glycol, 1 part by weight of silane coupling agent, 1 part by weight of abrasive agent, 1.5 parts by weight of rubber compounding oil, 0.15 parts by weight of 2-mercaptobenzothiazole, and die. After adding 0.4 parts by weight of benzothiazyl disulfite and 0.04 parts by weight of tetramethylthiuram disulfide, the mixture was stirred for 12 minutes in a stirrer set to a temperature of 55°C to form a rubber-carbon mixture.

The formed rubber-carbon mixture is put into an open roll mill and manufactured into a sheet shape with 0.6 parts by weight of sulfur added, and 0.1 parts by weight of carbon fiber is sprinkled on the top of the sheet to produce a sheet with carbon fibers on the surface. The manufactured sheet is then compression molded at 110°C to manufacture the outsole.

Table 1 and Figures 4 to 6 show the results of testing the tensile strength, elongation, specific gravity, slip resistance, and abrasion resistance of outsoles containing carbon fibers with lengths of 1 mm, 3 mm, and 6 mm, respectively. Among them, when 6mm of carbon fiber was included, the wear resistance was the best, and other results were confirmed to show significant values.

Test Items unit Example 1 Example 2 Example 3 carbon fiber length mm One 3 6 tensile strength MPa 10.7 12.2 11.7 elongation rate % 341 383 376 importance - 1.15 1.15 1.12 Skid resistance test
(deflation) - 1.30 1.08 1.05 Skid resistance test
(wet) - 0.98 0.91 1.00 Wear test
(NBS type) % 223 241 317

In this way, the outsole manufactured using the outsole manufacturing method with improved abrasion resistance by grafting carbon fiber according to the present invention can improve abrasion resistance through carbon fiber while maintaining the rubber elasticity of the outsole and friction on dry ground. By destroying the water film between the ground and the outsole through the fibers, slip resistance can be improved on slippery surfaces such as floors or ice. In particular, in the case of slip resistance and abrasion resistance, specific values were confirmed through example results, and through this, it was possible to prove that when an outsole containing carbon fiber was manufactured, slip resistance and abrasion resistance were improved.

The present invention is not limited to the above-described embodiments, and the scope of application is diverse. Of course, various modifications are possible without departing from the gist of the present invention as claimed in the claims.

10: Outsole
100: Outsole body
200: first bottom part
300: second bottom part
400: Third bottom part
S100: Rubber mixture preparation step
S200: Carbon fiber and additive mixing step
S210: Carbon fiber preparation stage
S220: Carbon fiber surface modification step
S230: Carbon fiber and additive input step
S300: Sheet formation and carbon fiber spraying step
S400: Sheet compression molding step

Claims (5)

Outsole body having an upper and lower surface;
A first sole made of rubber and carbon fiber material formed on the lower surface of the outsole body at a position corresponding to the rear foot;
A plurality of second soles are formed at positions corresponding to the forefoot and midfoot on the lower surface of the outsole body, are spaced apart at regular intervals along the longitudinal direction of the outsole body, and are made of a rubber material. ; and
An outsole with improved wear resistance by grafting carbon fiber, comprising: a plurality of third bottom parts disposed between the plurality of second bottom parts spaced apart from each other and made of a rubber material. According to clause 1,
The second bottom part,
An outsole with improved wear resistance by grafting carbon fiber, which is formed of a rubber-carbon mixture in which carbon fiber is mixed with the rubber. According to clause 1,
The third bottom part,
An outsole with improved wear resistance by incorporating carbon fiber, which features a herringbone pattern. According to clause 1,
An outsole with improved wear resistance by grafting carbon fiber, characterized in that the carbon fiber has a length of 6 mm. A rubber mixture preparation step of preparing a rubber mixture of natural rubber, butadiene rubber, and nitrile butadiene rubber;
A carbon fiber and additive mixing step of mixing carbon fiber and additives with the rubber mixture to form a rubber-carbon mixture;
A sheet forming and carbon fiber spraying step of forming a sheet using the rubber-carbon mixture and spraying the carbon fiber on the surface of the sheet; and
A method of manufacturing an outsole with improved wear resistance by grafting carbon fiber, comprising a sheet compression molding step of manufacturing an outsole by compression molding the sheet.