JPH06155646A - Rubber sheet material molded by integrally layering solid layer and sponge layer simultaneously - Google Patents

Abstract

PURPOSE:To eliminate all work processes including adhering process so as to remarkably improve work efficiency by integrally molding in layer a non- foamed solid layer whose apparent specific gravity is specified and a sponge layer simultaneously. CONSTITUTION:For mixing components at a sponge side, butadiene resin is made to be 40-80 parts, cross linking agent is made to be 1.0 parts or less based on polymer 100 parts, and apparent specific gravity is made to be within 0.45-0.95. For a solid side, the butadiene resin is 30-60 parts, thermoplastic rubber is 20-40 parts, the cross linking agent is 1.0 parts or less with respect to the polymer 100 parts, and the apparent specific gravity is within 0.85-1.5. A sponge layer 1 and a solid layer 2 are integrally molded in layer simultaneously so as to obtain a rubber sheet material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber sheet material in which a solid layer and a sponge layer are integrally laminated.

[0002]

2. Description of the Related Art Conventionally, rubber sheet materials for artificially made shoe soles, for example, are roughly classified into sponge which is a foam, burnt sole which is not foamed or what is called a light plate. There is.

[0003]

Generally, sponges are light as much as they are foamed, but they are slightly inferior in physical properties, and solid (non-foamed) products are excellent in physical properties but heavy. There are drawbacks. For this reason, conventionally, solids with good physical properties are used on the ground contact side, and light sponges are used for the other parts. Therefore, in sports shoes and the like, solids and sponges are pasted together with an adhesive for practical use. However, in this method, the solid and the sponge must be molded separately and then bonded together later, which is a time-consuming method. Therefore, it is possible to mold the sponge-mixed fabric and the solid-mixed fabric together at the same time. It was impossible to commercialize the products that warped.

The present invention has been made in view of the above problems of the prior art. The object of the present invention is to make it possible to manufacture a solid and a sponge at the same time without warping. An object of the present invention is to provide a rubber sheet material in which a solid layer and a sponge layer are simultaneously laminated and molded.

[0005]

In order to achieve the above object, the present invention uses a polymer 10 as a blending component on the sponge side.
For 0 parts, 40 to 80 parts of butadiene resin and 1.
The content is 0 part or less, and the apparent specific gravity is 0.45 to 0.95. Also, on the solid side, for 100 parts of polymer,
Butadiene resin 30-60 parts, thermoplastic rubber 20-40
Parts, cross-linking agent 1.0 part or less, apparent specific gravity 0.85-
Within the range of 1.5, the sponge layer and the solid layer are simultaneously laminated and molded to obtain the integrally laminated rubber sheet material.

[0006]

Even if the sponge layer and the solid layer are simultaneously foam-molded, the expansion of the sponge side also expands the solid side, and there is no warping due to internal stress on the solid side.

[0007]

【Example】

 Example I 1) Compounding ingredients Sponge layer (weight part) Solid layer (weight part) Butadiene resin 70 50 High styrene rubber 15-Thermoplastic rubber-30 Synthetic rubber (SBR) 15-Synthetic rubber (IR) -20 Zinc flower 5 5 Stearic acid 11 White carbon 20 20 Hard clay 30-Surface treated charcoal 30-Process oil 5-Activator 11 Crosslinking agent 1 0.8 Foaming agent 3-Foaming aid 3--━━━━━━━━━ ━━━━━━━━━━━━━━━━━━━━━━━━━━ Total 199 127.8

2) Physical properties Sponge layer Solid layer Apparent specific gravity 0.75 1.95 Hardness (Hs-C) 80 90 Tensile strength (kgf / cm ² ) 45 120 Elongation (%) 350 450 450 Tear strength (kgf / cm) ) 29 40 Abrasion resistance (CC / HP / H) 350 50 (By Williams type abrasion tester) Flex resistance 50,000 times bending length after bending (mm) -9 (Demacha type bending tester, from 2 mm crack) Growth) The pressing conditions for the sample product were 164 ° C. × 15 minutes. Further, in FIG. 1, the sponge layer 1 and the solid layer 2 are
A good result was obtained in the total thickness range of 0.5 to 5 mm.

Example II 1) Compounding ingredients Sponge part Solid part Butadiene resin 60 40 High styrene rubber 15-Thermoplastic rubber-15 Synthetic rubber (SBR) 25 25 Synthetic rubber (IR) -20 Zinc white 55 5 Stearic acid 11 1 White carbon 15 10 Hard clay 20-Surface treated charcoal 50-Process oil 5-Activator 11 Crosslinker 1 0.7 Foaming agent 3.5-Foaming aid 3.5-━━━━━━━━━ ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Total 205.0 117.8 2) Physical properties Sponge part Solid part Apparent specific gravity 0.71 0.92 Hardness ( hs-C) 75 78 tensile strength (kgf / cm ²⁾ 40 98 elongation (%) 320 400 tear strength (kgf / cm) 25 32 abrasion resistance (CC / HP · H) 400 65 ( Williams formula milling Bending resistance 50,000 times bending length after bending (mm) -9 (Demacha type bending tester, growth from 2 mm crack) The pressing condition for the above sample product is 164 ° C x 15 minutes. It was Further, in FIG. 1, the sponge layer 1 and the solid layer 2 are
A good result was obtained in the total thickness range of 0.5 to 5 mm.

[0010]

Since the present invention is constructed as described above, it has the following effects. A rubber sheet material in which a sponge layer and a solid layer are integrally laminated and adhered can be commercialized by foam molding at the same time in a molding die, and all the processing steps such as adhesion are reduced, resulting in a significant improvement in work efficiency. Can be expected.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a rubber sheet material in which a solid layer and a sponge layer are integrally laminated at the same time.

[Explanation of symbols]

 1 Sponge layer 2 Solid layer

Claims (1)

[Claims] 1. A rubber sheet material in which a non-foamed solid layer having an apparent specific gravity of 0.85 to 1.5 and a sponge layer having an apparent specific gravity of 0.45 to 0.95 are integrally laminated at the same time.