JP2006230978A - Antislip sole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antislip sole prevented from a lowering of antislip function by maintaining strength through improvement in strength degradation due to the long-term use of an antislip sole for walking on a road surface with water standing, a frozen road surface and a high hardness road surface, and improved from the viewpoints of productivity, production cost and merchandising. <P>SOLUTION: Zirconia added alumina grains with zirconia fine grains with the grain diameter of 10-300 μm added are dispersed in an optional pattern in a sole mold, and at least one kind selected out of a group comprising jute fiber, chaff grains and stone grains of fruits is dispersed at a request. Sole rubber and/or a thermoplastic synthetic resin compound is then filled and pressed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an anti-slip shoe sole. More specifically, the present invention relates to an anti-slip shoe sole in which a part of ceramic particles is exposed and embedded on a ground contact surface of a shoe sole made of a rubber and / or thermoplastic synthetic resin compound.

  When walking on wet roads such as rainy sidewalks, snowy roads, icy roads, boat decks, fish markets, etc., soles with rubber and / or thermoplastic synthetic resin as the main component Various methods have been adopted to provide a slip-proof function.

  The most classic method is to thicken the bottom to form deep wrinkles. In the case of this conventional method, there is a disadvantage that the snow slips into a deep groove and freezes and the anti-slip effect is reduced, or the anti-slip effect is reduced on an icy road.

  As another conventional technique, there is a method of embedding studs in a shoe sole. In the case of this prior art, when walking on a road without snow, a pavement road with no icing, or an iron plate, there is a disadvantage that it is slippery and a mass of the entire shoe is increased.

  Furthermore, as another prior art, there is a method in which a steel fork-shaped anchor is embedded in the heel portion of the shoe sole so that the fork bites the road surface as necessary. In the case of this prior art, there is a drawback that it is troublesome because the shoes do not always have an anti-slip function.

  However, theoretically considering the physical phenomenon of “sliding”, rubber used for walking on wet roads such as rainy sidewalks, snowy roads, frozen roads, boat decks, fish markets, etc. In order for the anti-slip material used for the sole of the shoe, the main component of which is a thermoplastic synthetic resin, to successfully perform the anti-slip function, the anti-slip material absorbs water at the interface between the shoe bottom and the road surface well. It is understood that the contradictory property of maintaining strength must be imparted simultaneously.

  In general, when two objects are trying to move relative to each other, or when they are moving relative to each other, at the interface, a force that tries to prevent the movement acts in a tangential direction. Resistance to is called friction. Friction is as follows: (1) True contact occurs at some point within the apparent contact area, where both sides adhere, and the adhesion occurs along with plastic deformation, and the surrounding area undergoes plastic deformation. When the movement always involves shearing of the adhesive part, (2) When one side moves up and down the unevenness of the other side with the movement, a part of the mechanical energy is lost as heat (3 ) Occurs when there is work in which the convex part of one surface digs up the other's surface.

  When walking, the surface of the bottom of the shoe, which is mainly composed of rubber and / or thermoplastic synthetic resin, is in contact with the road surface, and the convex part of the road surface digs up the surface of the bottom of the shoe for work. Friction occurs and does not slip even when walking. Conversely, a film that covers the bottom of the shoe is formed at the interface between the bottom surface of the shoe and the hard surface of the road, and the projecting portion of the road surface digs up the bottom surface of the shoe. When it becomes impossible, friction does not occur and a phenomenon of slipping occurs.

  The cause of the formation of a film formed at the interface between the bottom surface of the shoe and the road surface, the main component of which is rubber and / or thermoplastic synthetic resin, is water. Therefore, in order to prevent slipping, (i) the water at the interface between the bottom surface of the shoe and the road surface is quickly removed, and the convex portion of the road surface digs up the bottom surface of the shoe. (B) The convex part of the bottom surface of the shoe should be able to work by digging up the road surface. For (i), it is necessary to give the shoe sole the property of absorbing as much water as possible quickly. For (b), an altitude higher than the hardness of the road surface is given to the sole of the shoe, and a property of biting the road surface with certainty, that is, a throwing effect is given.

  Considering this sliding theory, rubber and / or heat characterized in that 3 to 30 parts by weight of at least one of seed shell, fruit core and leather pulverized product is blended with 100 parts by weight of diene rubber. A rubber composition for shoe soles mainly composed of a plastic synthetic resin has been proposed (JP-A-5-154005).

  However, this conventional technique has the disadvantages that the water-absorbing seed shell, fruit core and leather pulverized product swell during long-term use, resulting in reduced strength and reduced anti-slip function.

  Further, considering this slip theory, 0.05 weight of pulverized material obtained by pulverizing walnut shells or gramineous cereal shells to an average particle diameter of 1.0 mm or less with respect to 100 parts by weight of rubber and / or resin. A method of blending not less than 2.0 parts by weight and not more than 2.0 parts by weight has been proposed. (Japanese Patent No. 3270387)

  However, this prior art also has the disadvantages that the pulverized water-absorbent seed shell swells during long-term use, resulting in reduced strength and reduced anti-slip function.

JP-A-5-154005 Japanese Patent No. 3270387

  The problem to be solved by the present invention is that rubber and / or thermoplastic synthetic used when walking on wet roads such as rainy sidewalks, snowy roads, icy roads, boat decks, fish markets, etc. Anti-slip soles, which are mainly composed of rubber and / or thermoplastic synthetic resin as the main component, improve the disadvantage that strength decreases during long-term use, and maintain anti-slip function. It is to prevent degradation and to provide an improved antiskid sole from the standpoint of productivity, production cost and merchandising.

Means to solve the problem

  In order to devise means for solving the problem, the present inventor has proposed the above-described anti-slip theory, that is, (b) preventing water from staying at the interface between the contact surface of the shoe sole and the road surface, and (b) We applied that the convex part of the ground contact surface of the shoe sole can work to dig up the road surface.

  As a means for simultaneously solving (a) and (b), the use of ceramics having a specific particle size range was studied.

  In order to allow the convex part of the ground contact surface of the shoe sole to dig up the road surface and to perform work, some ceramic particles are placed on the ground contact surface of the shoe sole made of rubber and / or a thermoplastic synthetic resin compound. By exposing and embedding, the convex part of the ceramic can work to dig up the road surface, that is, the convex part of the ceramic can bite the road surface reliably when walking. In addition, it was studied to prevent water from staying at the interface between the contact surface of the shoe sole and the road surface.

  To that end, (A) if the volume formed by the adjacent ceramic particles embedded in the ground contact surface of the shoe sole and the shoe sole and the ground contact surface is made as small as possible, the amount of water contained therein is reduced, We thought that the hydroforming effect could be prevented. Also, (B) the convex portion of the ceramic embedded in the ground contact surface of the shoe sole enables the work to dig up the road surface, that is, the convex portion of the ceramic reliably bites the road surface during walking. In order to be able to do so, it was thought that as much ceramic particles as possible should be embedded in the ground contact surface of the shoe sole.

  In order to solve both of the above (A) and (B), the present inventor conducted experiments by changing the particle diameter of the ceramic particles, and confirmed the effect.

  Furthermore, it has been found that the above (A) is more effective by dispersing at least one selected from the group consisting of jute fibers, rice husk particles and fruit core seed particles in combination with ceramics.

Therefore, the above problem is solved as follows.
(1) It was manufactured by dispersing ceramic particles having a particle size of 10 to 300 μm in a shoe mold with an arbitrary pattern, filling a rubber for soles and / or a thermoplastic synthetic resin compound, and pressing. Anti-slip soles.

  (2) In the above item (1), the ceramic is alumina, aluminate, mullite, zinc oxide, rare earth oxide, chromium oxide, cobalt oxide, silica, zirconia, tin oxide, tungsten oxide, zirconic acid Salts, nitrides (Si3N4, AlN, BN, TiN, etc.), carbides (SiC, TiC, B4C, WC, etc.), borides (LaB6, TiB2, ZrB2, etc.), sulfides (CdS, MoS2, etc.), silicides ( MoSi2 etc.), fiber-mixed ceramic composite material, particle-dispersed ceramic, cermet which is a composite material of ceramic and metal, titanium carbide-dispersed alumina composed of alumina and titanium carbide, zirconia-added alumina to which zirconia fine particles are added, alumina-dispersed zirconia , Titanium carbide, tungsten carbide, titanium nitride, titanium boride, It is at least one selected from the group consisting of zirconium.

  (3) In the item (1) or (2), the ceramic is porous.

  (4) In any one of the items (1) to (3), at least one selected from the group consisting of jute fibers, rice husk particles, and fruit seed particles is dispersed.

  The term “ceramics” used in the present invention is defined as “a solid material in which the main constituent material produced by sintering or melting at a high temperature is inorganic or non-metallic”.

  Examples of the ceramic used in the present invention include oxide ceramics. Oxide ceramics include alumina (aluminum oxide), aluminate, mullite, zinc oxide, rare earth oxide, chromium oxide, cobalt oxide, silica, zirconia, tin oxide, tungsten oxide, zirconate, etc. Illustrated.

  Another example of the ceramic used in the present invention is a non-oxide ceramic. Non-oxide ceramics include nitrides (Si3N4, AlN, BN, TiN, etc.), carbides (SiC, TiC, B4C, WC, etc.), borides (LaB6, TiB2, ZrB2, etc.), sulfides (CdS, MoS2, etc.) ), Silicides (MOSi2 and the like).

  In the present invention, a ceramic composite material further comprising a ceramic matrix, a fiber reinforced ceramic whose strength or toughness is enhanced by blending fibers in the ceramic, and particles of a material different from the base material are dispersed in the ceramic to provide strength or toughness. It is also possible to use a cermet which is a composite material of particle dispersed ceramics and ceramics and metal reinforced.

  Preferred ceramics used in the present invention are dense titanium carbide-dispersed alumina composed of oxide alumina and non-oxide titanium carbide, having a large Vickers hardness of 2000, or zirconia-added alumina to which zirconia fine particles are added, partially stable Alumina-dispersed zirconia, titanium carbide, tungsten carbide, titanium nitride, titanium boride, zirconium boride, etc., in which alumina is dispersed in zirconium zirconia or the like to suppress zirconia grain growth and further improve strength and toughness.

  It is preferable that the ceramic particles used in the present invention have a water absorption performance to the extent that they are present. For this purpose, it is preferable to form pores on the surface of the ceramic particles. The pores are preferably independent pores rather than continuous pores. However, it is difficult to form 100% continuous pores or 100% independent pores, and most of them are mixed. Pores are generally formed by mixing and burning rice husks and organic fibers at the time of ceramic production. When these are gasified at a temperature at which glassy material is formed, the porous body has closed pores. Is manufactured.

  The average particle diameter of the ceramic particles used in the present invention is 10 to 300 μm. When the average particle size of the ceramic particles is 10 μm or less, it is not preferable because it becomes a fine powder, the anti-slip effect is reduced, and the productivity is also lowered. Conversely, when the average particle diameter of the ceramic particles is 300 μm or more, the volume formed by the adjacent ceramic particles embedded in the ground contact surface of the shoe sole, the shoe sole, and the ground contact surface increases, and the water contained in the inside is increased. This is not preferable because the amount of the water increases and a hydroforming effect occurs.

  In the present invention, the amount of the ceramic particles placed on the shoe mold is preferably about 0.1 to 0.2 g per 1 cm 2. When the amount of ceramic particles is less than 0.1 g / cm 2, the anti-slip effect is reduced, which is not preferable. On the other hand, if the amount of ceramic particles is 0.2 g / cm 2 or more, it is not preferable because of excessive physical properties in terms of the anti-slip effect, which increases the cost.

  The anti-slip shoe sole of the present invention is manufactured by dispersing a predetermined amount of ceramic particles in a shoe mold in an arbitrary pattern, and then filling and pressing the shoe sole rubber and / or thermoplastic synthetic resin compound. . An advantage of this manufacturing method is that it is possible to produce a non-slip shoe sole with a relatively small amount of ceramics.

  The main material used for the anti-slip shoe sole of the present invention is rubber or thermoplastic synthetic resin, or a mixture of rubber and thermoplastic synthetic resin, and is not particularly limited. However, when rubber is used as the main material used for the anti-slip shoe sole of the present invention, the rubber compounding can be produced irrespective of the relatively soft rubber (hardness of 45 to 70 °).

  In the present invention, jute fibers, rice husk particles of certain plants, or fruit seed particles may be used in combination with ceramic particles. As a result, water intervening at the interface between the contact surface of the shoe sole and the road surface is absorbed, and a water layer is formed at the interface between the contact surface of the shoe sole and the road surface to prevent a hydroforming phenomenon from occurring. The effect can be further improved.

  The term “rice husk” used in the present invention is defined as a ground product of cereals such as rice, barley, wheat, buckwheat, straw, millet and acne.

  The term “fruit seed particles” used in the present invention is defined as ground particles of fruit seeds such as apricots, peaches, walnuts, and plums. The particle size of the nuclear seed particles of these fruits is in the range of 0.4 mm to 2.0 mm, preferably in the range of 0.9 mm to 1.2 mm, for example.

The invention's effect

  According to the invention described in claim 1, since the particle size of the ceramic particles embedded in the ground contact surface of the shoe sole is reduced to 10 to 300 μm, the adjacent ceramic particles embedded in the ground contact surface of the shoe sole and the shoe sole The volume formed by the ground contact surface is reduced, the amount of water contained therein is reduced, the occurrence of the hydroforming effect can be prevented, and the convex portion of the ceramic embedded in the ground contact surface of the shoe sole, The work of digging up the road surface can be performed, that is, the convex portion of the ceramic can bite the road surface reliably during walking.

  According to the second aspect of the present invention, among ceramics, ceramics having particularly high hardness, strength, and toughness are used, so that slip resistance and durability are guaranteed.

  According to the invention described in claim 3, since the ceramic is porous, it has water absorption performance to the extent that it is present, so water can be prevented from staying between the shoe sole and the ground contact surface. The occurrence of the hydroforming effect can be prevented.

  According to the invention described in claim 4, since at least one selected from the group consisting of ceramic particles and jute fibers, rice husk particles and fruit kernel seed particles is used in combination, jute fibers, rice husk particles and fruit kernel seed particles Since it exhibits water absorption, water can be prevented from staying between the shoe sole and the ground contact surface, and the hydroforming effect can be prevented.

  Hereinafter, the best mode for carrying out the invention will be specifically described with reference to Examples and Test Examples.

[Example 1]
White ceramic random fused white alumina manufactured by Showa Denko Co., Ltd. was used as ceramic particles. These ceramic particles have an apparent specific gravity of 1.75 and a Mohs hardness of 9. The standard particle size is 60 to 70 μm.

A rubber compound for shoe soles was produced with the following composition.
Ingredient Mass part
Natural rubber 100
Isoprene Rubber 150
Silica 25
Vulcanization accelerator M 5.5
Vulcanization accelerator TS 0.7
Stearic acid 2.5
Zinc oxide 12.5
Sulfur 6

  First, about 0.15 g of the ceramic particles per 1 cm 2 was dispersed on a shoe mold, filled with 100 g of the above rubber compound, and molded by a conventional method to produce a shoe sole.

[Effect Confirmation Test Example 1]
The anti-slip performance on the iron plate of the shoe sole with the anti-slip material of Example 1 is shown in Table 1 in comparison with that of Control Example 1 (rubber without additive for anti-slip material).

[Effect confirmation test example 2]
Table 2 shows the anti-slip performance of the shoe sole with the anti-slip material of Example 1 in comparison with that of the control example 1 (non-slip material-free rubber) by spraying water on the iron plate.

[Example 2]
The same ceramic particles as in Example 1 were used.

  Walnut particles were used as fruit seed particles. The particle size of the walnut particles is in the range of 0.4 mm to 2.0 mm.

  In the same manner as in Example 1, about 0.15 g of the ceramic particles per cm 2 was dispersed on the shoe mold, and 0.1 g of walnut particles were further dispersed, and 100 g of the same rubber compound as in Example 1 was filled. Then, a shoe sole was manufactured by molding according to a conventional method.

  An effect confirmation test was performed in the same manner as in Example 1, and it was confirmed that the antiskid effect of the antiskid shoe sole of Example 2 was excellent.

[Example 3]
The same ceramic particles as in Example 1 were used.

  Peach fruit particles were used as fruit seeds. The particle size of the peach fruit particles is in the range of 0.4 mm to 2.0 mm.

  In the same manner as in Example 1, about 0.15 g of the ceramic particles per 1 cm 2 is dispersed on the shoe mold, and 0.1 g of peach fruit particles are further dispersed. 100 g was filled and molded by a conventional method to produce a shoe sole.

  An effect confirmation test was performed in the same manner as in Example 1, and it was confirmed that the antiskid effect of the antiskid shoe sole of Example 3 was excellent.

[Example 4]
The same ceramic particles as in Example 1 were used.

  Rice husk was used as rice husk particles. As for the particle size distribution of the rice husk particles, 50 mesh (about 0.28 mm or more) is 70% or more, 50 to 100 mesh (about 0.28 to 0.15 mm) is 28% or less, and 100 mesh pass (0.15 mm or less). 2% or less.

  In the same manner as in Example 1, about 0.15 g of the ceramic particles per cm 2 were dispersed on the shoe mold, and 0.1 g of rice husk particles were further dispersed, and 100 g of the same rubber compound as in Example 1 was filled. Then, a shoe sole was manufactured by molding according to a conventional method.

  An effect confirmation test was performed in the same manner as in Example 1, and it was confirmed that the antiskid effect of the antiskid shoe sole of Example 4 was excellent.

  Rubber used for walking on wet roads such as rainy sidewalks, snowy roads, frozen roads, boat decks, fish markets, and / or rubbers based on thermoplastic synthetic resins and / or Anti-slip shoe soles composed mainly of a thermoplastic synthetic resin improve the disadvantage of swelling and lowering strength during long-term use, and preventing the decrease in anti-slip function by maintaining strength, productivity, To provide an improved non-slip sole from the viewpoint of production cost and merchandising, and expand the application of ceramic particles.

Claims (4)

  Non-slip shoe sole produced by dispersing ceramic particles having a particle size of 10 to 300 μm in a shoe mold with an arbitrary pattern, filling a rubber for sole and / or a thermoplastic synthetic resin compound, and pressing .   Ceramics are alumina, aluminate, mullite, zinc oxide, rare earth oxide, chromium oxide, cobalt oxide, silica, zirconia, tin oxide, tungsten oxide, zirconate, nitride (Si3N4, AlN, BN) TiN, etc.), carbides (SiC, TiC, B4C, WC, etc.), borides (LaB6, TiB2, ZrB2, etc.), sulfides (CdS, MoS2, etc.), silicides (MoSi2, etc.), fiber-containing ceramic composite materials, Particle-dispersed ceramics, Cermet, which is a composite material of ceramics and metal, Titanium carbide-dispersed alumina composed of alumina and titanium carbide, Zirconia-added alumina with zirconia fine particles added, Alumina-dispersed zirconia, Titanium carbide, Tungsten carbide, Titanium nitride, Is it a group consisting of titanium boride and zirconium boride? Slip sole according to claim 1 is at least one selected.   The antiskid shoe sole according to claim 1 or 2, wherein the ceramic is porous.   The antiskid shoe sole according to any one of claims 1 to 3, wherein at least one selected from the group consisting of jute fibers, rice husk particles, and fruit seed particles is dispersed.