JPH06113902A - Manufacture of shoes - Google Patents

Abstract

PURPOSE:To provide a manufacture of shoes by which post-treatment processes such as buffing process chlorination treatment, primer treatment and adhesive application process or the like can be shortened to reduce the cost, the adhesiveness between a sole made by polyurethane and a rubber antislipping piece can be improved and further hydrolysis deterioration of polyurethane can be decreased. CONSTITUTION:At the time of manufacturing a composite sole formed by disposing a rubber antislipping piece on a part or the whole of the grounding surface side of a sole made by polyurethane, a piece of cloth 2 is set on one surface of an unvulcanized rubber piece 1, and then pressed under a designated temperature to form an antislipping piece 3 where the cloth 2 is applied under pressure. Subsequently polyurethane is injected between an instep cover 5 mounted in metal molds 21, 22, 23 and the antislipping piece 3 to connect a sole 6 made by polyurethane and the rubber antislipping piece 3 to each other through the cloth 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoe having a double sole (composite sole) in which a rubber anti-slip is arranged on a part or the whole of a ground surface side of a polyurethane sole. Regarding the method.

[0002]

2. Description of the Related Art Generally, polyurethane is lightweight, has a high cushioning property, and is excellent in abrasion resistance, while vulcanized rubber is excellent in slip resistance. A shoe with a double shoe sole (composite shoe sole) in which a shoe sole made of rubber and an anti-slip shoe made of vulcanized rubber are joined has been developed and is widely used in fields such as sports shoes, casual shoes, and business shoes. There is.

However, since the adhesion between polyurethane and vulcanized rubber is low, there is a problem of lacking durability,
As a method of increasing the adhesion between polyurethane and vulcanized rubber, the adhesive side of the vulcanized anti-slip piece is buffed to roughen it, then that surface is chlorinated, and then the acrylic-modified urethane-based A complicated method is performed in which a primer treatment is performed, a urethane-based adhesive or the like is further applied, and then the resultant is mounted on a mold and polyurethane is injected.

[0004]

However, a large number of post-treatments such as buffing, chlorination treatment, primer treatment, and adhesive coating applied to the adhesive surface of the anti-slip piece cause a high cost. In addition, the treatment agent used for the chlorination treatment may accelerate the hydrolysis of polyurethane, and may cause the shoe sole (polyurethane) and the adhesive layer to be worn out.

The present invention has been made against the background of the above-mentioned conventional technical problems, and an object thereof is to shorten the post-treatment steps such as buffing, chlorination treatment, primer treatment and adhesive application to reduce the cost. Another object of the present invention is to provide a method for manufacturing a shoe in which the adhesion between a shoe sole made of polyurethane and a rubber anti-slip piece is improved and the polyurethane is less likely to be hydrolyzed and degraded.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in the process of manufacturing a shoe having a composite shoe sole in which rubber anti-slip pieces are arranged on a part or the whole of the ground surface side of the sole made of polyurethane. After setting the cloth on one surface of the vulcanized rubber piece, press it at a predetermined temperature to form a slip-proof piece in which the cloth is pressure-bonded,
Next, a method for manufacturing a shoe is characterized in that polyurethane is injected between the scabbard attached to the mold and the anti-slip piece, and the shoe sole made of polyurethane and the rubber anti-slip piece are joined together via a cloth. It is provided.

The polyurethane used in the present invention is produced by reacting an organic diisocyanate component and a polyol component as main components, and optionally a chain extender, a catalyst, water as a foaming agent, a pigment, a surfactant and the like. It is a thing.

The part of the shoe sole on the side of the ground contact surface in the present invention means, for example, a stepping part or a heel part.

The rubber used in the present invention is
Usually, rubber used for shoe soles, such as natural rubber, styrene-butadiene rubber (SBR), isoprene rubber (I
R), at least one unvulcanized rubber selected from natural rubber and synthetic rubber such as acrylonitrile-butadiene rubber (NBR). And, for unvulcanized rubber,
Calcium carbonate, silane-treated or fatty acid-treated calcium carbonate or magnesium carbonate, hydrous silicates such as hydrous aluminum silicate, fillers such as titanium dioxide and zinc oxide, crosslinking agents, other antioxidants, softeners, pigments, etc. It is compounded.

The fabric used in the present invention is
Fabrics such as woven fabrics, knitted fabrics, and non-woven fabrics, and those fibers are cotton, hemp, plant fibers such as ramie, animal fibers such as wool, camel hair, alpaca, cashmere, mohair, rabbit hair, viscose rayon and copper. Recycled fibers such as ammonia rayon, semi-synthetic fibers such as acetate, polyamide,
Vinylon, polyvinyl chloride, polyester, acrylic,
It is at least one type of fiber selected from synthetic fibers such as polyethylene, polypropylene, and polyurethane.

The temperature for vulcanizing the unvulcanized rubber piece is 140 to 180 ° C., preferably around 160 ° C., and the pressure for vulcanization is 10 to 200 kg / cm ² , preferably 50 to 100 kg / cm ² , vulcanization time is 1 to 1
It is 0 minutes, preferably about 5 minutes.

The thickness of the anti-slip pieces is 1 to 10 mm, preferably 3 to 5 mm.

The cloth may be impregnated with a resin such as SBR latex which improves the adhesiveness to unvulcanized rubber during press molding. Further, in order to improve the adhesiveness between the cloth and the sole made of polyurethane, the bonding surface side of the cloth may be raised or an adhesive may be applied.

The adhesive composition that constitutes the adhesive is preferably one containing, as a main component, a urethane resin, which is made of polyurethane and has good adhesion to the shoe sole.

The polyisocyanate constituting the urethane resin includes tolylene 2,4-diisocyanate, tolylene 2,6-diisocyanate and mixtures thereof, diphenylmethane-4,4'-diisocyanate and 3-methyldiphenylmethane-4,4. ′ -Diisocyanate, isophorone diisocyanate, hydrogenated MD
I, hexamethylene diisocyanate, crude products thereof, etc. are preferred, and diphenylmethane-4,4 'diisocyanate is preferred.

As the polyol, adipic acid and a diol (ethylene glycol, butylene glycol,
In addition to polyester polyols such as lactone-based polyester glycols obtained by ring-opening polymerization of ε-caprolactone with polyester diols and glycols (ethylene glycol, butylene glycol, etc.) as the initiator, cyclohexane, cyclohexanediol, neopentyl glycol, etc. Polytetramethylene glycol obtained by ring polymerization, sucrose, sorbitol, glycerin, trimethylolpropane, pentaerythritol, hexanetriol, ethylenediamine,
Examples thereof include polyether polyols using triethanolamine or the like as an initiator.

Further, as the chain extender, diols such as ethylene glycol, butylene glycol and diethylene glycol can be used.

The solid concentration of the adhesive composition is usually 10 to 20% by weight. Also, as a diluent solvent,
Toluene, methyl ethyl ketone, ethyl acetate, dimethylformamide, cyclohexanone, isopropyl alcohol and the like can be mentioned.

Further, in the adhesive composition constituting the adhesive layer, in addition to the above components, for example, Desmodur R (manufactured by Bayer Co., Ltd.), Coronate L and Coronate HL.
A cross-linking agent such as [Nippon Polyurethane Industry Co., Ltd.] may be contained.

Further, for the treatment of the adhesive on the cloth, for example, a coating method such as brush coating, spray coating or dipping can be used.

The adhesive layer is formed by applying the adhesive composition on a cloth and then drying it for a while.

In the present invention, the cover is not particularly limited, and any of natural leather, synthetic leather, PVC leather, canvas, etc. may be used.

[0023]

After the cloth is set on one surface of the unvulcanized rubber piece in this way, it is pressed at a predetermined temperature to form a slip-proof piece in which the cloth is pressure-bonded, and then the cover and the slip-proof piece attached to the mold are By injecting polyurethane between the two and binding the shoe bottom made of polyurethane and the rubber anti-slip through the cloth, buffing, chlorination, which was conventionally applied to the anti-slip,
Post-processing steps such as primer processing and adhesive application can be shortened, and cost can be reduced. In addition, there is no concern that the polyurethane constituting the shoe sole, adhesive, etc. will be hydrolyzed and deteriorated.

Further, since the shoe sole made of polyurethane and the rubber anti-slip piece are bonded via the cloth, the adhesion between the shoe sole made of polyurethane and the rubber anti-slip piece can be improved.

Hereinafter, a method for manufacturing a shoe according to the present invention will be described with reference to the drawings. In addition, in this example, a case where a slip-proof piece to which a nonwoven fabric is pressure-bonded is used is taken as an example.

First, as shown in FIG. 1, a mold (female mold) 1
An unvulcanized rubber piece 1 is loaded into the mold 1, and a non-woven fabric 2 made of synthetic fiber is placed thereon, and then a mold (male mold) 1
2 is set and then pressed (pressed) for a predetermined time at a predetermined temperature, as shown in FIG. 2, a part of the vulcanized rubber 1a enters between the fibers constituting the nonwoven fabric 2 and is integrated. The anti-slip piece 3 that is physically bonded is molded.

An adhesive is applied to the upper surface (nonwoven fabric side) of the anti-slip piece 3 thus obtained to form an adhesive layer 4 as shown in FIG.

Then, as shown in FIG. 4, a bottom mold 21 having the anti-slip pieces 3 incorporated therein, a last mold 22 having a California sword 5 suspended therein, and a side mold 23.
By press-contacting each other with each other to form the shoe sole molding void 24, and then by injecting polyurethane into the shoe sole molding void 24, the sole 6 made of polyurethane and the California squid 5 are formed.
A shoe in which the rubber-made anti-slip piece 3 is integrated is molded.

In the present invention, the buffing, chlorination treatment, and primer treatment which have been conventionally performed on the anti-slip pieces can be omitted, so that the cost can be reduced accordingly. Further, since the shoe sole made of polyurethane and the rubber anti-slip piece are bonded together via the cloth, the adhesion between the shoe sole made of polyurethane and the rubber anti-slip piece is improved. Moreover, since there is no need for chlorination or the like, it is possible to reduce hydrolysis deterioration of the polyurethane constituting the shoe sole and the adhesive.

[0030]

EXAMPLES Next, the present invention will be described in more detail by way of examples. Example 1 As shown in FIG. 1, a mold (female mold) was loaded with unvulcanized rubber pieces, and a nonwoven fabric made of synthetic fiber was placed thereon, and then the mold (male mold) was set. Then, it was pressed at a temperature of 160 ° C. for 5 minutes (pressure 100 kg / cm ² ), and as shown in FIG. 2, a part of the vulcanized rubber entered between the fibers constituting the nonwoven fabric and integrally formed. A bonded anti-slip piece was obtained.

Next, an adhesive (polyurethane adhesive containing polytetramethylene glycol, hydrogenated MDI, butylene glycol as a main component) is applied to the upper surface (nonwoven fabric side) of the anti-slip piece, and as shown in FIG. An adhesive layer was formed.

Next, as shown in FIG. 4, polyurethane was placed in the shoe sole molding void formed by mutually pressing the bottom mold incorporating the anti-slip pieces, the last mold suspending the California vine, and the side mold. Injection injection was performed to form a shoe in which a sole made of polyurethane, a California sword and an anti-slip piece were integrated.

The interfacial adhesive strength after the adhesion between the rubber sole and the shoe sole made of polyurethane of the shoe thus molded was 3.5 kg / cm ² .

The adhesion between the shoe sole made of polyurethane and the rubber anti-slip piece is determined according to JIS K6301 (7. Peeling test) [7.2.2 (1) Tumble-shaped test piece 7.4]. .3 calculation]. In addition, the compounding example of unvulcanized rubber is as shown in Table 1.

[0035]

[Table 1]

* 1) Kuraray Co., Ltd., isoprene rubber * 2) Nippon Zeon Co., Ltd., styrene-butadiene rubber * 3) Idemitsu Kosan Co., Ltd., process oil (naphthene type) * 4) Nippon Silica ( Ltd., white carbon

The non-woven fabric is made of polyester / nylon (weight ratio = 30/70) fiber and has a basis weight = 130 g /
m ² , thickness 0.7 mm, SBR latex impregnation [fiber /
SBR (weight ratio) = 60/40] was used. further,
The adhesive layer was formed by applying the adhesive on the surface of the non-woven fabric by brushing at 30 g / m ² (dry weight) and then drying for 3 hours.

Although the present invention has been described above, the present invention is not limited to the above description, and modifications and the like without departing from the scope of the invention are included in the present invention. is there.

[0039]

As described above, according to the present invention, after the cloth is set on one surface of the unvulcanized rubber piece, it is pressed at a predetermined temperature to form the anti-slip piece in which the cloth is pressure-bonded, and then the mold is formed. By injecting polyurethane between the fitted hood and the anti-slip piece and binding the shoe sole made of polyurethane and the rubber anti-slip piece via the cloth, the buffing that has been conventionally applied to the anti-slip piece, Post-treatment steps such as hydrochloric acid treatment, primer treatment, and adhesive application can be shortened, and the cost can be reduced. Further, since the shoe sole made of polyurethane and the rubber anti-slip piece are bonded to each other via the cloth, the adhesion between the shoe sole made of polyurethane and the rubber anti-slip piece can be improved. Furthermore, a shoe sole with less hydrolysis deterioration could be manufactured.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a molding method of a slip preventive piece applied to a method for manufacturing a shoe according to the present invention.

FIG. 2 is a cross-sectional view of a press-molded anti-slip piece.

FIG. 3 is a cross-sectional view of an anti-slip piece having an adhesive layer on the non-woven fabric side.

FIG. 4 is an explanatory view showing a method for manufacturing shoes according to the present invention.

[Explanation of symbols]

 1 Unvulcanized rubber piece 2 Fabric 3 Anti-slip piece 5 Cover 6 Polyurethane shoe sole 21 Bottom mold 22 Last mold 23 Side mold

Claims (1)

[Claims] 1. When manufacturing a shoe having a composite shoe sole in which a rubber anti-slip piece is arranged on a part or the whole of a ground surface side of a sole made of polyurethane, a cloth is formed on one surface of an unvulcanized rubber piece. After setting, press at a predetermined temperature to form a slip-proof piece with the cloth pressure-bonded, and then inject polyurethane between the slip cover and the slip-proof piece attached to the mold, and the sole and rubber made of polyurethane A method for manufacturing a shoe, characterized in that the anti-slip member made of the same is bonded via a cloth.