KR20000009283A - Production method for out-sole of shoes - Google Patents

Abstract

PURPOSE: A production method for an out-sole of shoes is provided to improve the all property of matter containing the lightening, the abrasion resistance of the out-sole of shoes. CONSTITUTION: The production method for the out-sole of shoes which has lightening, and abrasion resistance comprises of:mixing the ethylene vinyl acetate 60 - 95 wt.%, high polar polymer 5 - 40 wt.%, the stearyl zinc, the zinc oxide, the dicumyl peroxide, the foaming agent; making a foaming body by thermo-pressing for 30 - 50 minutes at 140 - 180°C; spreading a glue in the one face of the foaming body; laminating a non-bridged common rubber compound in a sheet type; press-molding by a thermo-press for 10 minutes at 155°C; cooling under 40°C by cool-pressing for 7 - 10 minutes.

Description

Method of manufacturing shoe outsoles.

The present invention relates to a shoe outsole manufacturing method, and more particularly, to a shoe outsole manufacturing method that can realize the weight and high wear resistance of the outsole.

Typically, shoe outsoles are largely classified into solid outsoles and foam outsoles, where the solid outsole is made of ordinary rubber, thermoplastic rubber, polyurethane, and the like. That is, the general rubber is most widely used as a material for shoe outsoles because of its excellent characteristics, and the specific gravity of the outsole made of rubber is about 1.12 to 1.14, which is not suitable for light weight implementation. The thermoplastic rubber has advantages such as moldability, scrap recyclability, and fashion, and has a specific gravity of less than 1.0, which is superior to the general rubber outsole, but has a specific gravity of about 0.9 due to the characteristics of the base polymer. As such, it is not suitable for lightweight implementations. Finally, polyurethane has the best wear resistance or general properties among the outsole material, but the specific gravity of the polymer itself is 1.2 or more, so the specific gravity is heavy, which is not suitable for light weight.

And, the foam outsole is usually made of 1,2-polybutadiene, ethylene-vinylacetate copolymer and polyurethane foam, which also have many problems. That is, in the case of the foam, it is possible to reduce the weight, but not only the physical properties (hardness, tensile strength, elongation rate, etc.) are lowered, but also the wear resistance and moldability are remarkably decreased in proportion to the decrease in specific gravity.

Accordingly, it is an object of the present invention to provide a method for manufacturing a shoe outsole that can improve the overall physical properties including the weight and wear resistance of the shoe outsole.

Another object of the present invention is to provide a shoe outsole manufacturing method that can implement the specific gravity of the shoe outsole to about 0.3 to 0.6.

Still another object of the present invention is to provide a shoe outsole manufactured by laminating a compound for general rubber outsole and a foam for weight reduction.

In order to achieve the above object, the manufacturing method of the shoe outsole of the present invention is 60 to 95 parts by weight of ethylene vinyl acetate and 5 to 40 parts by weight of a high polar polymer and a predetermined amount of zinc stearate, zinc oxide, dicumyl peroxide, foaming agent. To form a foam by heat pressing for about 30 to 50 minutes at about 140 ~ 180 ℃, apply an adhesive to one surface of the foam and then laminated the uncrosslinked general rubber compound in a sheet form, 10 at 155 ℃ It is characterized by producing a lightweight, highly wear-resistant outsole by compression molding by hot press for 10 minutes, by cold press for 7 to 10 minutes and cooling below 40 ° C.

Hereinafter, preferred embodiments of the present invention will be described in detail. In the following description, it should be noted that only parts necessary for understanding the shoe outsole of the present invention and a method of manufacturing the same will be omitted so as not to obscure the subject matter of the present invention.

According to the manufacturing method of the shoe outsole of the present invention, it consists of two main processes, which are manufactured for the general rubber-based outsole compound and the foam for weight reduction, respectively, then laminated and compression molded by a press. That is, 60 to 95 parts by weight of ethylene vinyl acetate and 5 to 40 parts by weight of a high polar polymer for improving adhesion upon lamination, preferably 5 to 5 materials selected from ethylene ethyl acrylate, ionomer, maleic anhydride modified ethylene vinyl acetate 40 parts by weight and a predetermined weight part of zinc stearate, zinc oxide, dicumyl peroxide for foaming, a predetermined amount of blowing agent and a predetermined amount of magnesium carbonate or hard calcium carbonate for densification of the foam cell are then mixed at about 155 ° C. The foam is produced by compression in a press for 45 minutes. In this case, the high polar polymer may be any one selected from acrylonitrile-butadiene rubber, chloroprene rubber, chlorinated polyethylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, and the like, or may be selected and blended from two or more thereof. . Thereafter, the general rubber-based outsole compound is prepared into an uncrosslinked sheet, and preferably, a predetermined amount of natural rubber or synthetic rubber is mixed with zinc oxide, stearic acid, sulfur, an accelerator, silica, and diethylene glycol to form an uncrosslinked state. Makes a rubber sheet. The synthetic rubber may be styrene-butadiene rubber, butadiene rubber, isoprene rubber, chloroprene rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber, chlorinated polyethylene rubber, polyurethane rubber, acrylonitrile-butadiene rubber, fluorine rubber, etc. These may be used alone or in combination of two or more thereof. After applying the adhesive on one side of the foam prepared as described above, after laminating the uncrosslinked rubber sheet, heat for 3 to 20 minutes in the range of about 140 to 180 ℃, preferably at about 155 ℃ for 10 minutes Compression molding by press The uncrosslinked rubber sheet is then crosslinked and bonded to the foam at the same time. The compression molded product is then cooled to about 40 ° C. or less with a cold press and then pressed for about 5 to 20 minutes, preferably 7 to 10 minutes at a pressure of about 80 to 180 kg / cm 2, and cooled to 40 ° C. or less. The foam is then molded while compacting to produce a lightweight, high wear resistant shoe outsole.

Hereinafter, the present invention will be described in detail based on the best preferred embodiment of the present invention, but the present invention is not limited to the embodiments.

Example 1

70 parts by weight of ethylene vinyl acetate, 30 parts by weight of ethylene ethyl acrylate, 12 parts by weight of magnesium carbonate, 2 parts by weight of zinc stearate, 2.3 parts by weight of zinc oxide and 0.8 parts by weight of dicumyl peroxide, 3.5 parts by weight of modified azodicarbonamide blowing agent. The blend is then compressed by press at about 155 ° C. for 45 minutes to produce a foam. Meanwhile, 45 parts by weight of styrene-butadiene rubber, 55 parts by weight of butadiene rubber, 5 parts by weight of zinc oxide, 1.5 parts by weight of stearic acid and 2 parts by weight of sulfur for crosslinking and 1.6 parts by weight of dibenzopiazolyl disulfide accelerator, tetramethylthiuram 0.1 parts by weight of the monosulfide promoter, 40 parts by weight of silica, and 3.75 parts by weight of diethylene glycol are combined to prepare an uncrosslinked general rubber compound. Here, the physical properties of the foam are specific gravity 0.2, hardness (type C) 65, tensile strength 26 kg / cm 2, elongation rate 280%, tear strength 12 kg / cm, wear resistance (NBS) 80%. General properties of the general rubber compound is specific gravity 1.12, hardness (type A) 65, tensile strength 150kg / ㎠, elongation 550%, tear strength 45kg / cm, wear resistance (NBS) 320%. Thereafter, the foam is cut to a thickness of 3 mm and then coated with an adhesive on one side, and then dried in an oven at about 60 ° C. for 10 minutes. Subsequently, the general rubber compound is made into a 0.5 mm sheet, and then laminated with the foam to be molded by compression for 10 minutes in a heat press at about 155 ° C., and then transferred to a cooling press while the mold is fastened to 30 ° C. or less. This completes the lightweight, high wear resistant shoe outsole.

Example 2

80 parts by weight of ethylene vinyl acetate, 5 parts by weight of ethylene ethyl acrylate, 15 parts by weight of ionomer, 10 parts by weight of magnesium carbonate, 1.5 parts by weight of zinc stearate and 0.8 parts by weight of dicumyl peroxide, and 3.3 parts by weight of modified azodicarbonamide blowing agent. The blend is then compressed by press at about 155 ° C. for 45 minutes to produce a foam. Meanwhile, 45 parts by weight of styrene-butadiene rubber, 55 parts by weight of butadiene rubber, 5 parts by weight of zinc oxide, 1.5 parts by weight of stearic acid and 2 parts by weight of sulfur for crosslinking and 1.6 parts by weight of dibenzopiazolyl disulfide accelerator, tetramethylthiuram 0.1 parts by weight of the monosulfide promoter, 40 parts by weight of silica, and 3.75 parts by weight of diethylene glycol are combined to prepare an uncrosslinked general rubber compound. Here, the physical properties of the foam are specific gravity 0.21, hardness (type C) 64, tensile strength 24 kg / cm 2, elongation rate 250%, tear strength 13 kg / cm, wear resistance (NBS) 85%. General properties of the general rubber compound is specific gravity 1.12, hardness (type A) 65, tensile strength 150 kg / ㎠, elongation 550%, tear strength 45kg / cm, wear resistance (NBS) 320%. Thereafter, an adhesive is applied to one side of the foam, and then the general rubber-based compound sheet in the uncrosslinked state is laminated, and then molded by compression for 4 minutes in a heat press at about 180 ° C., followed by a cold press The mixture is cooled to 30 ° C. or lower, and the molded article is taken out. This completes the lightweight, high wear resistant shoe outsole.

Example 3

80 parts by weight of ethylene vinyl acetate, 20 parts by weight of maleic anhydride modified ethylene vinyl acetate, 25 parts by weight of hard calcium carbonate, 1 part by weight of zinc stearate and 0.8 parts by weight of dicumyl peroxide, and 4.5 parts by weight of modified azodicarbonamide blowing agent The foam is prepared by pressing in a press at about 155 ° C. for 45 minutes. On the other hand, 60 parts by weight of styrene-butadiene rubber, 40 parts by weight of butadiene rubber, 4 parts by weight of zinc oxide, 1 part by weight of stearic acid and 2.4 parts by weight of sulfur for crosslinking and 0.65 parts by weight of hexamethylenetetramine accelerator, dibenzopiazolyl disulfide accelerator 0.87 parts by weight, tetramethylthiuram monosulfide accelerator, 0.1 parts by weight, silica 40 parts by weight, diethylene glycol 1.5 parts by weight of the compound to prepare a non-crosslinked general rubber compound. Here, the physical properties of the foam are specific gravity 0.12, hardness (type C) 45, tensile strength 18㎏ / ㎠, elongation 210%, tear strength 8㎏ / cm, wear resistance (NBS) 60%. General properties of the general rubber compound is specific gravity 1.13, hardness (type A) 67, tensile strength 135kg / ㎠, elongation 650%, tear strength 39kg / cm, wear resistance (NBS) 300%. Thereafter, the foam is cut to a thickness of 3 mm and then coated with an adhesive on one side, and then dried in an oven at about 60 ° C. for 10 minutes. Subsequently, the general rubber compound is made into a 0.5 mm sheet, and then laminated with the foam, followed by compression for 12 minutes in a heat press at about 145 ° C., and then transferred to a cold press while the mold is fastened to 30 ° C. or less. This completes the lightweight, high wear resistant shoe outsole.

Example 4

80 parts by weight of ethylene vinyl acetate, 20 parts by weight of maleic anhydride modified ethylene vinyl acetate, 25 parts by weight of hard calcium carbonate, 1 part by weight of zinc stearate and 0.8 parts by weight of dicumyl peroxide, and 4.5 parts by weight of modified azodicarbonamide blowing agent The foam is prepared by pressing in a press at about 155 ° C. for 45 minutes. On the other hand, 70 parts by weight of butadiene rubber, 30 parts by weight of natural rubber, 5.4 parts by weight of zinc oxide, 1 part by weight of stearic acid and 3 parts by weight of sulfur for crosslinking and 1.5 parts by weight of dibenzopiazolyl disulfide accelerator, tetramethylthiuram monosulfur 0.1 parts by weight of the feed promoter, 45 parts by weight of silica, and 2 parts by weight of diethylene glycol were blended to prepare an uncrosslinked general rubber compound. Here, the physical properties of the foam are specific gravity 0.12, hardness (type C) 45, tensile strength 18㎏ / ㎠, elongation 210%, tear strength 8㎏ / cm, wear resistance (NBS) 60%. General properties of the general rubber compound is specific gravity 1.12, hardness (type A) 68, tensile strength 140kg / ㎠, elongation 600%, tear strength 42kg / cm, wear resistance (NBS) 280%. Thereafter, the foam is cut to a thickness of 3 mm and then coated with an adhesive on one side, and then dried in an oven at about 60 ° C. for 10 minutes. Subsequently, the general rubber compound is made into a 0.5 mm sheet, laminated with the foam, and molded by compression for 12 minutes in a heat press at about 145 ° C., and then transferred to a cold press while the mold is fastened to 30 ° C. or less. This completes the lightweight, high wear resistant shoe outsole.

Here, in order to contrast the general characteristics of the shoe outsole manufactured according to each embodiment of the present invention and the shoe outsole manufactured by a different method to each other, some comparative examples are presented.

[Comparative Example]

Comparative Example 1 is a solid outsole manufactured using ordinary rubber.

Comparative Example 2 is a shoe outsole molded according to the conditions of Example 1 using only a normal sponge without lamination.

Comparative Example 3 is a shoe outsole in which a general rubber compound sheet manufactured in the same manner as in Example 1 or 2 using a general sponge for shoe soles is laminated according to the conditions of Example 1.

Hereinafter, when comparing the physical properties of the shoe outsole according to each of the examples and comparative examples prepared by the above method as follows.

As described above, the present invention satisfies the required characteristics of the shoe outsole such as wear resistance, such as abrasion resistance, because the rubber-based outsole compound and foam are laminated to the ground, and at the same time, the overall specific gravity of the outsole ranges from 0.3 to 0.6. Because of this, the weight of the shoe can be realized. In addition, it has superior characteristics (specific gravity, hardness, tensile strength, elongation rate and tear strength, etc.) compared to conventional shoe outsoles to improve the quality of the product. have.

Claims (5)

In the manufacturing method of a shoe outsole, 60 to 95 parts by weight of ethylene vinyl acetate, 5 to 40 parts by weight of a polymer, a predetermined amount of zinc stearate, zinc oxide, dicumyl peroxide, and a blowing agent are mixed, and thermally pressed at about 140 to 180 ° C. for 30 to 50 minutes. And then applying an adhesive to one surface of the foam, and then stacking the uncrosslinked general rubber compound into a sheet, then compression molding with a hot press and cooling with a cold press to produce a lightweight, highly wear-resistant outsole. Method of manufacturing shoe outsoles. The method of claim 1, wherein the polymer is ethylene ethyl acrylate, ionomer, maleic anhydride modified ethylene vinyl acetate, acrylonitrile-butadiene rubber, chloroprene rubber, chlorinated polyethylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber Method for producing a shoe outsole characterized in that. The method of claim 1, wherein the polymer is at least two of ethylene ethyl acrylate, ionomer, maleic anhydride modified ethylene vinyl acetate, acrylonitrile-butadiene rubber, chloroprene rubber, chlorinated polyethylene rubber, chlorosulfonated polyethylene rubber, and acrylic rubber. Method for producing a shoe outsole, characterized in that the composition is a blend of the above components. The method of claim 1, wherein the hot press is made at about 140 ~ 180 ℃ about 3 to 20 minutes. The method of claim 1, wherein the cooling press cools the foam to which the general rubber compound is bonded at 40 ° C. or less at a pressure of about 80 to 180 kg / cm 2 for about 5 to 20 minutes. .