KR20180062541A - A Elastic Sheet for Outsole and A Manufacturing Method thereof - Google Patents

Abstract

The present invention relates to an elastic sheet for an outsole and a manufacturing method thereof. The manufacturing method of an elastic sheet for an outsole comprises: a first step of mixing a butadiene composition containing 34 wt% of acrylonitrile and a first additive; a second step of adding a second additive to the mixture in the first step and forming a first rubber composition with pellets in a molding machine; a third step of mixing a butadiene composition containing 18 wt% of acrylonitrile and a first additive; a fourth step of adding a second additive to the mixture in the third step and forming a second rubber composition with pellets in the molding machine; and a fifth step of mixing the first rubber composition and the second rubber composition to manufacture the same into an elastic sheet through the molding machine. According to the present invention, it is possible to manufacture an elastic sheet for an outsole capable of maintaining soft physical properties even at temperatures below zero.

Description

Technical Field [0001] The present invention relates to an elastic sheet for an outsole,

The present invention relates to an elastic sheet, and more particularly, to an elastic sheet for an outsole capable of retaining elasticity even at a sub-zero position, and a method of manufacturing the elastic sheet.

Generally, the shoe has a structure for preventing slippage in accordance with the type of shoe. In other words, a stud or a spike is attached to the bottom of a shoe such as a soccer shoe or a baseball shoe used in an athletic event to prevent slippage, and on the bottom of a shoe such as a running shoe or a shoe used in the outdoors, So as to prevent slippage.

However, when walking on the ice road or snowy road in winter, since the sole of the shoe mainly uses synthetic rubber or polyurethane resin, the slippery can not be sufficiently prevented, and the shoe can fall down. In addition, the aqua shoe, which is mainly used in the summer season, has increased the convenience of watering. However, when walking on rocks or gravels wet with water such as a valley or a stream, the slippery is maximized, There was an increasing problem.

Typical rubber materials are high temperature fats with high temperature, soft properties in summer, cold fats in low temperature, and hardness in winter. When it comes to a low hardness, the force to grab the ground drops, causing many accidents to slip.

For this reason, in order to obtain a soft property even under a low temperature condition, a rubber which maintains a moderate property is used, but when it is used in summer, the strength is lowered and the rubber is not firmly retained.

Patent No. 10-1432961

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an elastic sheet for an outsole which can maintain soft physical properties even at a low temperature and a method for manufacturing the same.

In order to achieve the above-mentioned object, the elastic sheet for outsole of the present invention and the method of manufacturing the same are manufactured by mixing rubber compositions having different hardnesses.

Wherein the rubber composition is a first rubber composition having a hardness of 80 A or more at -20 캜 and a second rubber composition having a hardness of -70 캜 or less at -20 캜.

The first rubber composition was prepared by mixing 100 parts by weight of a butadiene composition containing 34% by weight of acrylonitrile and 66% by weight of butadiene, 50 parts by weight of the first additive and 2.1 parts by weight of the second additive, , And the second rubber composition was prepared by mixing 100 parts by weight of a butadiene composition containing 18% by weight of acrylonitrile and 82% by weight of butadiene, 50 parts by weight of the first additive and 3.2 parts by weight of the second additive, .

The first additive may be Zinc Oxide (ZnO), Stearic Acid (St / A), Titanium Dioxide, Silica, or Polyethylene Glycol (PEG) And the second additive is selected from the group consisting of 2-mercaptobenzothiazole (M), dibenzothiazyl Dissulfide (DM), tetramethyl thiuram disulfide (TT), sulfur (S).

The method for producing an elastic sheet for an outsole according to still another embodiment of the present invention comprises a first step of mixing and mixing a butadiene composition containing 34% by weight of acrylonitrile and a first additive, A second step of adding a second additive and then pelletizing the first rubber composition in a molding machine, a third step of mixing and mixing the butadiene composition containing 18% by weight of acrylonitrile and the first additive, and the third step A fourth step of adding a second additive to a mixture of the first rubber composition and the second rubber composition and then pelletizing the second rubber composition in a molding machine, The method comprising the steps of:

The elastic sheet for an outsole according to the present invention and its manufacturing method have the following effects.

There is an effect that elastic sheet having different hardness is mixed with each other to produce an elastic sheet for outsole to minimize the decrease in durability and improve the feeling of grip.

1 is a flowchart showing a manufacturing process of an elastic sheet for an outsole according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of an elastic sheet for outsole and a method of manufacturing the same according to the present invention will be described in detail with reference to the accompanying drawings.

The elastic sheet for outsole according to the present invention is produced by mixing rubber compositions having different hardnesses.

The method for producing an elastic sheet for outsole according to the present invention comprises a first step of mixing and mixing a butadiene composition containing 34% by weight of acrylonitrile and a first additive, and a second step of adding a second additive to the mixture of the first step A second step of making a first rubber composition from pellets in a molding machine, a third step of mixing and mixing the butadiene composition containing 18% by weight of acrylonitrile with the first additive, and a third step of mixing A second step of preparing a second rubber composition by pelletizing in a molding machine after adding the second additive, and a fifth step of mixing the first rubber composition and the second rubber composition and then producing the elastic sheet through a molding machine .

First, the first rubber composition and the second rubber composition are prepared in the form of pellets in order to produce the elastic sheet for outsole of the present invention.

The first rubber composition has a hardness of 80 A or higher at -20 캜, and the second rubber composition has a hardness of -20 캜 to 70 A or less.

In order to obtain such physical properties, the first rubber composition and the first rubber composition and the second rubber composition first mix the first additive with butadiene.

More specifically, the first rubber composition is prepared by first adding a first additive to a butadiene composition prepared by mixing 34% by weight of acrylonitrile (AN) and 66% by weight of butadiene and mixing.

The first additive may be Zinc Oxide (ZnO), Stearic Acid (St / A), Titanium Dioxide, Silica, Polyethylene Glycol (PEG), or the like .

100 parts by weight of the mixture may be mixed with 50 parts by weight of the first additive.

Next, a promoter and a cross-linking agent, which are second additives, are added to the mixture and mixed.

As the accelerator of the second additive, 2-mercaptobenzothiazole (M), dibenzothiazyl disulfide (DM), tetramethyl thiuram disulfide (TT), tetra Tetramethyl Thiuram Monosulfide (TT) and the like may be used.

As the crosslinking agent, sulfur (S) or sulfur compounds may be used.

100 parts by weight of the butadiene composition and 2.1 parts by weight of the second additive may be mixed.

Next, the mixture in which the second additive is mixed is molded into a pellet of the first rubber composition through a molding machine. That is, the mixture is poured into a twin roll mill to produce a sheet downward and then pulverized to produce a pellet, or a pellet can be produced through an extruder.

The second rubber composition is prepared by mixing 18% by weight of acrylonitrile (AN) and 82% by weight of butadiene into a butadiene composition and mixing the first additive first.

The first additive may be Zinc Oxide (ZnO), Stearic Acid (St / A), Titanium Dioxide, Silica, Polyethylene Glycol (PEG), or the like .

100 parts by weight of the mixture may be mixed with 50 parts by weight of the first additive.

Next, a promoter and a cross-linking agent, which are second additives, are added to the mixture and mixed.

As the accelerator of the second additive, 2-mercaptobenzothiazole (M), dibenzothiazyl disulfide (DM), tetramethyl thiuram disulfide (TT), tetra Tetramethyl Thiuram Monosulfide (TT) and the like may be used.

As the crosslinking agent, sulfur (S) or sulfur compounds may be used.

100 parts by weight of the butadiene composition and 3.2 parts by weight of the second additive may be mixed.

Next, the mixture containing the second additive is formed into a pellet of the second rubber composition through a molding machine. That is, the mixture is poured into a twin roll mill to produce a sheet downward and then pulverized to produce a pellet, or a pellet can be produced through an extruder.

Next, the first rubber composition and the pellets of the second rubber composition are mixed. At this time, the pellets of the first rubber composition and the pellets of the second rubber composition can be mixed evenly.

The ratio of the first rubber composition to the rubber composition may be 30 to 60% by weight of the second rubber composition for 40 to 70% by weight of the first rubber composition.

The first rubber composition and the second rubber composition are mixed through a dry blend, and an elastic sheet is produced through a molding machine.

Next, details of the production of the sheet by mixing in the composition shown in Table 1 using the rubber composition having different hardness in the present invention will be described in detail.

First, the process of producing the first rubber composition and the second rubber composition will be described first.

First Embodiment Second Embodiment Butadiene composition (acrylonitrile 34%) 100 Butadiene composition (18% acrylonitrile) 100 M 0.5 1.0 DM 0.5 1.0 TT 0.1 0.2 S 1.0 1.0 ZnO 3 St / A One TiO2 4 Sillica 40 Polyethylene Glycol 2.0 Hardness (tupe A) Room temperature 69 66 -20 ° C 80 70

1. Butadiene composition (acrylonitrile 34%): KNB35L, Kumho Petrochemical

2. Butadiene composition (acrylonitrile 18%): KNB1845, KKPC

3. Silica: Zeosil 155

2. Polyethylene glycol: PEG4000

[Example 1]

3 g of zinc oxide (ZnO), 1 g of stearic acid (St / A), 4 g of titanium dioxide (Titanium Dioxide), and 10 g of titanium dioxide were mixed with 100 g of a butadiene composition containing 34% by weight of acrylonitrile and 66% 40 g of silica and 2.0 g of polyethyleneglycol (PEG) were added and mixed in a line. 0.5 g of 2-mercaptobenzothiazole (M), 0.5 g of dibenzothiazyl disulfide, DM), 0.1 g of tetramethyl thiuram disulfide (TT) and 1.0 g of sulfur are put into a kneader, and the kneaded mixture is molded into pellets by an extruder. The hardness of Example 1 was 80 A at -20 캜.

[Example 2]

3 g of zinc oxide (ZnO), 1 g of stearic acid (St / A), 1 g of titanium dioxide (hereinafter referred to as " titanium dioxide ") were added to 100 g of a butadiene composition containing 18% by weight of acrylonitrile and 82% , 2.0 g of polyethylene glycol (PEG), and the mixture was pre-mixed, 1.0 g of 2-mercaptobenzothiazole (M), 1.0 g of dibenzothiazyl disulfide 1.0 g of Dibenzothiazyl Dissulfide (DM), 0.2 g of tetramethyl thiuram disulfide (TT) and 1.0 g of sulfur are put into a kneader, and the kneaded mixture is molded into a pellet by an extruder. The hardness of Example 1 was 70 A at -20 캜.

Next, the experimental results of preparing the elastic sheet of the present invention at the composition ratio shown in Table 2 will be described in detail.

Comparative Example 1 Comparative Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 1 100 30 40 50 60 70 80 Example 2 100 70 60 50 40 30 20

[Comparative Example 1]

100 g of the rubber composition of Example 1 was molded at 155 to 160 DEG C within 10 minutes through a molding machine to produce an elastic sheet.

[Comparative Example 2]

100 g of the rubber composition of Example 2 was molded at 155 to 160 DEG C within 10 minutes through a molding machine to produce an elastic sheet.

[Example 3]

70 g of the rubber composition of Example 2 was mixed with 30 g of the rubber composition of Example 1 through dry blending and molded at 155 to 160 ° C within 10 minutes through a molding machine to produce an elastic sheet.

[Example 4]

60 g of the rubber composition of Example 2 was mixed with 40 g of the rubber composition of Example 1 through dry blending and molded at 155 to 160 ° C within 10 minutes through a molding machine to produce an elastic sheet.

[Example 5]

50 g of the rubber composition of Example 2 was mixed with 50 g of the rubber composition of Example 1 through a dry blend and molded at 155 to 160 캜 within 10 minutes through a molding machine to produce an elastic sheet.

[Example 6]

40 g of the rubber composition of Example 2 was mixed with 60 g of the rubber composition of Example 1 through a dry blend and molded at 155 to 160 ° C within 10 minutes through a molding machine to produce an elastic sheet.

[Example 7]

30 g of the rubber composition of Example 2 was mixed with 70 g of the rubber composition of Example 1 through dry blending and molded at 155 to 160 ° C within 10 minutes through a molding machine to produce an elastic sheet.

[Example 8]

20 g of the rubber composition of Example 2 was mixed with 80 g of the rubber composition of Example 1 through dry blending and molded at 155 to 160 ° C within 10 minutes through a molding machine to produce an elastic sheet.

The results of investigating the circular recovery rates of the sheets produced in Examples 3 to 8 are shown in Table 3 below.

Comparative Example 1 Comparative Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Hardness
(type A) 69 66 69 68 68 69 69 69 Round recovery rate 1 minute 45 78 75 73 71 65 55 47 Round recovery rate 10 minutes 78 86 88 92 95 95 90 85 Wear 255 175 190 205 212 214 238 249

For outsole materials, the wear rate should be at least 200 or more. Below 200, it is difficult to apply to shoes because of weak grip. Example 3 can not be used as an outsole material because the wear rate is less than 190. In Example 8, the wear rate is high but the roundness recovery rate is 90 or less.

That is, as shown in Table 3, the results of the round recovery (10 minutes) of Examples 4 to 7 show a result of 90 or more, so that they can be used for outsole of footwear and the like.

It is to be understood that the invention is not limited to the disclosed embodiment, but is capable of many modifications and variations within the scope of the appended claims. It is self-evident.

Claims (5)

Wherein the elastic sheet is manufactured by mixing rubber compositions having different hardnesses. The method according to claim 1,
The rubber composition
Wherein the first rubber composition is a first rubber composition having a hardness of not less than 80 A at -20 캜 and a second rubber composition having a hardness of not higher than 70 A at -20 캜. The method according to claim 1,
Wherein the first rubber composition comprises:
100 parts by weight of a butadiene composition containing 34% by weight of acrylonitrile and 66% by weight of butadiene;
50 parts by weight of the first additive; And
And 2.1 parts by weight of a second additive were mixed to prepare pellets,
Wherein the second rubber composition comprises:
100 parts by weight of a butadiene composition containing 18% by weight of acrylonitrile and 82% by weight of butadiene;
50 parts by weight of the first additive; And
And 3.2 parts by weight of a second additive are mixed to produce a pellet. The method of claim 3,
Wherein the first additive comprises:
Characterized in that the metal oxide is zinc oxide (ZnO), stearic acid (St / A), titanium dioxide, silica, polyethylene glycol (PEG)
Wherein the second additive comprises:
(2-mercaptobenzothiazole, M), dibenzothiazyl disulfide (DM), tetramethyl thiuram disulfide (TT), sulfur (S) Wherein the elastic sheet is made of an elastic material. A first step of mixing and mixing the butadiene composition containing 34% by weight of acrylonitrile and the first additive;
A second step of adding a second additive to the mixture of the first step and then pelletizing the first rubber composition in a molding machine;
A third step of mixing and mixing the butadiene composition containing 18% by weight of acrylonitrile and the first additive;
A fourth step of adding a second additive to the mixture in the third step and then forming a second rubber composition with pellets in a molding machine;
And a fifth step of mixing the first rubber composition and the second rubber composition and then forming the elastic sheet through a molding machine.

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