JPH09121902A - Sueded material for shoe sole and manufacture of sueded material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sole material whose rich quality is not degraded even through a long time of service. SOLUTION: Fibrillated short fibers are compounded in a rubber matrix compound suitable for shoe sole, and after vulcanization, the surface is subjected to a buffing process so that the fibrillated short fibers in the facial layer are raised. Then the specified pattern is gravure printed, and thereover a top coat is applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoe sole and a method for producing the same. More specifically, the present invention relates to a shoe sole having a suede-like texture and a method for manufacturing the same.

[0002]

2. Description of the Related Art Suede is made by licking the skin of a calf or goat and fluffing the back of the skin with sandpaper or the like to make it soft and velvety. Its strengths are:
It is elegant and has a soft texture. Utilizing its advantages, it is used as a material for clothing and shoes. As a typical conventional technology for producing suede-like synthetic leather,
Nonwoven fabric, woven fabric, or knitted fabric made of various natural or synthetic fibers is impregnated with a polyurethane elastomer, or a polymer mainly composed of natural rubber or synthetic rubber, and then wet-coagulated, or There is a method of forming a porous structure by dry coagulation, and buffing the surface with sandpaper or the like to give a suede-like appearance.

In another conventional technique, a laminated sheet obtained by laminating a synthetic fiber web layer and a non-woven fabric sheet is needle-punched and impregnated with a polyurethane elastomer or a polymer mainly composed of natural rubber or synthetic rubber,
There is a method of forming a porous structure by wet coagulation or dry coagulation, and buffing the surface with sandpaper or the like to give a suede-like appearance.

The suede-like synthetic leather produced by these conventional techniques has weak tear strength or tensile strength, or is apt to cause delamination, or is used as a shoe sole material, or is used as a fiber and a base material. Because of poor adhesion to rubber,
There was a drawback that the fibers detached during the course of use.

[0005]

The problem to be solved by the invention is that in the prior art for producing a suede-like synthetic leather, the sole for shoes has physical properties such as tear strength or tensile strength and does not cause delamination. That is, it was not possible to manufacture suede-like bottom materials that could be used as timber. Other problems and advantages to be solved by the invention will be made clear successively below.

[0006]

Means for Solving the Problems In devising means for solving the above-mentioned problems, the present inventors have to use high tear strength, flexibility,
To control the physical properties of the bottom material such as elasticity. Do not cause delamination. The main consideration was to have a homogeneous and rich suede tone. As a result of repeated examinations, in order to solve the problem, use matrice as natural or synthetic rubber. In order to solve the problem, unlike the prior art, do not use a multi-layer machined base fabric such as a hare layer sheet in which a synthetic fiber web layer and a nonwoven fabric sheet are laminated. In order to solve the problem, when buffing the surface, a large amount of short fibers may be blended in the matrix so that the fibers are raised in a rich manner, or on the surface of the rubber matrix where the short fibers are uniformly exposed. It has been discovered that if a predetermined pattern is gravure-printed and a top coat is applied if desired, a suede tone with further improved high-class feeling can be obtained. It is also understood that blending short fibers into rubber improves processability, reduces deformation and shrinkage, and contributes to increasing hardness, and that blending into foams gives uniform cells. did.

Therefore, according to the present invention, which is a means for solving the above-mentioned problems, the fibrillated short fibers contained in the rubber matrix suitable for the sole material for shoemaking are uniformly exposed from the surface layer of the rubber matrix. A suede-like sole material for shoes, which is characterized by being raised and raised.

Further, according to the present invention, which is a means for solving the above-mentioned problems, fibrillated short fibers are uniformly mixed in a rubber matrix suitable for a sole material for shoes, and the surface thereof has a predetermined pattern. Gravure printing, and a topcoat layer is applied, a part of the fibrillated short fibers is embedded in the gravure printing, and a topcoat layer, and a part is exposed from the surface of the topcoat layer. It is a suede-like sole material for shoes, which is characterized by

The rich and robust suede-like sole material for suede-prepared shoes of the present invention is a natural or synthetic rubber, or a rubber obtained by mixing them with various additives for rubber and fibrillated short fibers. It is manufactured by molding into a sheet by compression molding by a conventional method, then buffing the surface of the sheet, and raising the fibrillated short fibers in the surface layer.

The rich and robust suede sole material for shoes according to the present invention comprises natural or synthetic rubber, or a rubber obtained by mixing them with various additives for rubber and fibrillated short fibers. A sheet is formed by compression molding into a sheet by a conventional method, and then the surface of the sheet is buffed to raise the fibrillated short fibers of the surface layer and exposed to the surface layer, and then at least one primer is applied to the surface layer. Then, a predetermined pattern is gravure printed, then at least one top coat layer is applied to the printing surface, a part of the fibrillated short fibers is embedded in the gravure printing and the top coat layer, and a part of the fibrillated short fibers is embedded. It is manufactured by exposing the surface of the top coat layer.

The fibers used in the present invention include cotton,
Examples include natural fibers such as hemp, rayon, and acetate, or synthetic fibers such as nylon, polyester, polyacrylonitrile, and polyolefin. However, since the surface temperature of the sheet rises during the buffing process, it is necessary to use fibers that can withstand this temperature, but this problem is solved by improvement of the buffing technology, for example, proper selection of the buffing speed. . Further, in the case of cotton fibers, there are problems in so-called firmness and elasticity, but this problem can also be solved by modifying the surface of the cotton fibers.
It was found that the most preferable fiber used in the present invention is hemp staple fiber in consideration of cost, effect and the like. However, natural fibers other than hemp or synthetic fibers may also be used in the present invention by suitable treatment to modify the surface.

Considering cost and effect, the most preferable fiber used in the present invention is a hemp short fiber having a value exemplified below: fiber length 0.1 to 5 mm fiber diameter 1 to 10 μ Crystallinity 20 to 50% Water content of fiber 7 to 10%

The short fibers used in the present invention are raised to be as rich as possible when subjected to buffing, in order to develop a texture close to that of natural suede, and the effect of entanglement between short fibers or rubber matrix. In order to improve the above, a so-called fibrillated short fiber obtained by splitting a monofilament constituting the fiber in the longitudinal direction is preferable. Therefore, the most preferred fibers for use in the present invention are fibrillated hemp staple fibers having the above numerical range. However, natural fibers other than hemp or synthetic fibers may also be used in the present invention by suitable treatment to modify the surface. Accordingly, fibrillated short fibers of surface-modified natural or synthetic fibers are also used in the present invention.

The amount of the short fibers used in the present invention is 5
-50 parts by weight, more preferably 10-30 parts by weight, 5
If it is less than 50 parts by weight, a rich suede tone cannot be obtained, and if it is more than 50 parts by weight, it is difficult to process and there is no cost advantage.

As the rubber used in the present invention, a material suitable as a bottom material is appropriately selected from natural or synthetic rubber.
The rubber as the matrix of the bottom material may be foamed, and when foamed, in addition to the original effect of reducing the weight, the refractive index of the foamed portion and the short fiber portion raised by the buffing process is changed. Due to the optical effect, a suede tone with good texture with shadow and depth is obtained.

The basic bottom material of the present invention includes natural or synthetic rubber suitable for the bottom material, short fibers, and fillers, processing aids, vulcanizing agents, vulcanization accelerators, lubricants, colorants, It is manufactured by forming a sheet having a thickness of 3 mm by a proper blending of a foaming agent and the like, and then polishing the sheet at a buffing speed of 4 to 5 m / mm to raise short fibers on the surface.

Furthermore, the shoe sole material of the present invention is obtained by applying a one-part cross-linking urethane resin solution as a primer to the surface of the basic sole material produced by the above-mentioned method, and further, if desired, a second primer. As a solid solution, a two-component cross-linking urethane resin solution is applied, and then a one-component cross-linking urethane resin solution is applied at least once, preferably three times,
After drying at room temperature for 10 minutes and printing a predetermined pattern, a polyurethane solution having a thickness of 0.01 to 0.03 mm, for example, is preferably applied twice as a top coat. The rubber sheet coated with the top coat is dried in a drying oven, for example, a far infrared oven, and then cooled.

The surface of the basic bottom material produced by the present invention is gravure-printed, and a top coat layer is further applied to the surface to uniformly expose the surface of the rubber matrix of the basic bottom material. A part of the fibrillated short fibers that had been used was embedded in the gravure printing and topcoat layer,
A part is exposed from the surface of the top coat layer. Therefore,
The fibrillated short fibers exposed from the surface of the topcoat layer of the bottom material give the texture and feel peculiar to suede, while the fibrillated short fibers embedded in the gravure printing and the topcoat layer. However, in combination with the effect of printing, an improved optical effect is exhibited, the sense of quality is further improved as compared with a bottom material not subjected to gravure printing, and the use as a bottom material is expanded.

The present invention will be specifically described below with reference to Examples and Comparative Examples.

Example 1 Example 1 is an example of producing a solid suede bottom material. (1) Used short fibers Fiber length 0.8 mm Fiber diameter about 2 to 7 μ Crystallinity about 40% Water content about 8%

[0020] (2) Recipe -1 Ingredient Amount (parts by weight) SBR1502 75 two poles 2057SS (manufactured by Nippon Zeon) 25 Short fibers 20 Zinc white 5 Antioxidant 1.5 Hard Clay 60 two Pushiru ER-R ( Made in Japan Silica) 45 Carbon black 30 Process oil 10

(3) Formulation table-2 Component amount (parts by weight) Sulfur 2.7 Accelerator TT 0.3 Accelerator DM 1.5 Accelerator F 1.5 Triethanolamine 1 Stearic acid 1

The formulations shown in Table-1 were kneaded in a Banbury mixer at 60 ° C. for about 6 minutes by a conventional method, and the formulations shown in Table-2 were added by an open roll. Then temperature 165
At 10 ° C and a pressure of 100 Kg / cm ² by compression molding
A sheet having a size of 00 mm × 1200 mm × 3 mm was manufactured.
Then, this sheet is sanded belt AA-80
(Sankyo Rigaku Co., Ltd.) was used to buff the surface layer of the sheet at a buffing speed of 5 m / min. The surface produced as a result of buffing was a fine, velvety suede-like surface. Furthermore, as a result of observing the surface with a microscope of 20 times, about 500 napped short fibers were observed per 1 cm ² .

[0023]

Example 2 Example 2 is an example of producing a suede-like bottom material of sponge. (1) Short fibers used The same short fibers as in Example 1 were used. (2) Recipe -3 Ingredient Amount (parts by weight) RB820 (manufactured by JSR) 50 two-pole 2057SS (manufactured by Nippon Zeon) 30 Natural rubber 20 Zinc white 5 two Pushiru _VN 3 30 HAF carbon black 10 Polyethylene glycol 2 Hard clay 10

[0024] (3) Recipe -4 Ingredient Amount (parts by weight) Sulfur 2.5 accelerators F 0.5 accelerator DM 0.5 VINYFOR AK # 2 5 (foaming agent) stearate 1

The formulations shown in Table 3 were kneaded in a Banbury mixer at 60 ° C. for about 5 minutes by a conventional method, and the formulations shown in Table 4 were added by an open roll. Then, temperature 160
At 10 ° C. and a pressure of 100 kg / cm ² by compression molding.
A sheet having a size of 00 mm × 1200 mm × 10 mm was manufactured. The expansion ratio of the produced sheet was 1.3. Then, attach this sheet to the sanding belt AA-8.
0 (manufactured by Sankyo Rikagaku Co., Ltd.) was used to buff the surface layer of the sheet at a buffing speed of 5 m / min. The surface produced as a result of buffing was a fine, velvety suede-like surface. Furthermore, as a result of observing the surface with a microscope of 20 times, about 500 napped short fibers were observed per 1 cm ² . Furthermore, since the surface is foamed, a delicate optical effect is exhibited between the diffuse reflection of the surface and the napped short fibers, and the bottom material produced in Example 1 is
Bottom materials with different textures were obtained. In addition, the bottom materials manufactured in Examples 1 and 2 had various physical properties that could be used as shoe soles.

[0026]

Comparative Example Non-fibrillated hemp staple fibers having the following characteristics were used. Fiber length 0.8 mm Fiber diameter about 50 μm Crystallinity about 79% Moisture content of fiber about 8% The same procedure as in Example 1 was carried out except that the above short fibers were used. The bottom material manufactured in Comparative Example and the bottom material manufactured in Example 1 were subjected to a short fiber peeling test using cellophane tape. As a result, in the case of using Example 1, that is, using fibrillated short fibers, Although the short fibers were hardly peeled from the surface, most of the bran fibers on the surface were peeled off and the suede state was poor in the comparative example, that is, when the non-fibrillated short fibers were not used. From this, it was confirmed that by fibrillating the short fibers, the entanglement between the short fibers and the entanglement with the rubber matrix are strengthened, and a suede tone having a rich texture is obtained.

[0027]

Example 3 Gravure printing was performed on the surface of the solid bottom material produced in Example 1. The processing agents used in the printing process are as follows. First primer: One-component crosslinking reaction type urethane resin solution Second primer: Two-component crosslinking reaction type urethane resin solution First solid: One-component crosslinking reaction type urethane resin solution First top coat: Two-component crosslinking reaction type urethane resin solution 1 Topcoat: Two-component crosslinking reaction type urethane resin solution

The first primer was applied to the surface of the bottom material produced in Example 1, and after drying, the second primer was applied. After applying the primer, the first solid, the second solid, and the third solid are applied in this order, followed by drying at room temperature for 10 minutes, then printing a predetermined pattern, and then applying the first top coat and the second top coat. After coating, it was passed through a hot air oven at 130 ° C. for 5 minutes and then cooled.

[0029]

Example 4 The bottom material of the sponge produced in Example 2 was gravure printed by the same procedure as in Example 3.

Observation of Printed Surface When the printed surface of the bottom material produced in Examples 3 and 4 was observed with a 40 × microscope, it was found that the fibrillated short film was uniformly exposed on the bottom material from the surface layer before printing. A part of the fiber is embedded in the gravure printing and the top coat layer,
In addition to the printing effect, the optical effect is further improved. On the other hand, part of the fibrillated short fibers is exposed from the surface of the top coat layer, so the texture and feel peculiar to suede are obtained. Was maintained.

[0031]

As described above, the basic shoe sole material according to the present invention is produced by blending fibrillated short fibers in a rubber matrix, vulcanizing and buffing the surface to raise the fibers. As a result, it becomes a rich suede-like sole material with excellent texture. Since the short fibers are fibrillated, the short fibers are tightly entangled with each other in the rubber matrix, so the short fibers are not peeled from the surface even after long-term use, and the suede-like texture is maintained for a long time. Moreover, since the tip surface of the fiber is intricately cleaved, a subtle and deep suede tone can be obtained. Improves physical properties as a shoe sole material. And so on. Further, the bottom material of the present invention obtained by performing Gravure printing on the surface of the basic shoe bottom material, the surface material was uniformly exposed from the surface layer surface to the bottom material before printing. Since a part of the fibrillated short fibers that were uniformly exposed from the above is embedded in the gravure printing and the top coat layer, the improved optical effect is exhibited in combination with the effect of printing. ,
On the other hand, since part of the fibrillated short fibers is exposed from the surface of the top coat layer, the texture and feel peculiar to suede are maintained, and the overall fastness and high-grade feeling are improved. The application as a sole material for shoemaking will be expanded without damaging the rich texture.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical indication location B32B 27/16 (72) Inventor Shozaburo Dobashi 5-22-3 Miyaura, Mihara-shi, Hiroshima (72) Inventor Hisaichiro Uchida 573-7 Shiromachi, Mihara City, Hiroshima Prefecture

Claims (8)

[Claims] 1. A suede-like sole material for shoemaking, wherein fibrillated short fibers contained in a rubber matrix suitable for a shoemaking sole material are uniformly exposed from the surface layer of the rubber matrix and are raised. Suede-like sole material for shoes, characterized by being in the state of being. 2. A suede-like sole material for shoemaking, wherein fibrillated short fibers are uniformly mixed in a rubber matrix suitable for the sole material for shoemaking, and gravure printing with a predetermined pattern is formed on the surface thereof, and A top coat layer is applied, a part of the fibrillated short fibers is embedded in the gravure printing, and the top coat layer, and a part is exposed from the surface of the top coat layer. A suede-like sole material for shoes. 3. A method for producing a suede-like sole material for shoes, comprising blending natural or synthetic rubber, or a rubber obtained by mixing them with various additives for rubber and fibrillated short fibers, and compressing by a conventional method. A method for producing a rich and robust suede-like bottoming material, which comprises molding into a sheet by molding, then buffing the surface of the sheet, raising the fibrillated short fibers of the surface layer, and exposing the fibrillated short fibers on the surface layer. . 4. A method for producing a suede-like sole material for shoes, comprising blending natural or synthetic rubber, or a rubber obtained by mixing them with various additives for rubber and fibrillated short fibers, and compressing by a conventional method. Molded into a sheet by molding, then buffing the surface of the sheet, raising the fibrillated short fibers of the surface layer, after exposing the surface layer surface, at least one primer is applied to the surface layer surface, predetermined Gravure print the pattern, then apply at least one topcoat layer on the printed surface, part of the fibrillated short fibers are embedded in the gravure printing and topcoat layer, part of the topcoat layer A method for producing a rich and robust suede bottom material, which comprises exposing from the surface of the. 5. The suede-like sole material for shoes according to claim 1, wherein the fibrillated short fibers are hemp fibrillated short fibers. 6. The method for producing a suede sole material for shoes according to claim 3, wherein the fibrillated short fibers are hemp fibrillated short fibers. 7. The suede-like sole material for shoes according to claim 1, wherein the fibrillated short fiber is a surface-modified natural or synthetic fiber. 8. The method for producing a suede-like sole material for shoes according to claim 3, wherein the fibrillated short fibers are surface-modified natural or synthetic fibers.