JPH05179072A - Rubber composition and molded product therefrom - Google Patents

Abstract

PURPOSE:To obtain a rubber composition capable of giving molded products of high slip resistance along with retaining wear resistance by incorporating a rubber component consisting of natural rubber and/or synthetic rubber with a specified amount of keratin powder. CONSTITUTION:The objective composition excellent in slip resistance on ice roads can be obtained by incorporating (A) 100 pts.wt. of a rubber component consisting of natural rubber and/or synthetic rubber like butadiene rubber with (B) 1-100 pts.wt. of keratin powder pref. consisting of animal hair powder and/or feather down powder. The keratin powder is pref. 1mum to 1mm in mean diameter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber composition and a molded article using the same, and more specifically, it imparts excellent anti-slip property in the production of a rubber molded article such as a tire tread or a shoe sole. In particular, the present invention relates to a rubber composition that exhibits excellent performance in preventing slippage on ice and snow surfaces.

[0002]

2. Description of the Related Art Conventionally, spiked tires have been generally used when a vehicle travels on a snowy and snowy road surface, but they have been prohibited because of serious social problems such as damage to the road surface and generation of dust. Instead of this, a studless tire will be used, and various studies have been made to improve the slip resistance.

For example, fine air bubbles are added to a tire tread, fibers of collagen protein which is the main component of leather in rubber (Japanese Patent Laid-Open No. 2-219837, 2-235980), short vegetable fibers or shells of walnuts. Powder is added to improve the slip resistance. However, the performance cannot be said to be sufficient, and for example, even if the slip resistance is solved to some extent, the wear resistance often becomes extremely poor.

Further, as a bottom material for footwear, a material having urethane as a base material is often used as a material having good slip resistance, but it has a drawback that it has poor wear resistance. Conventionally used rubber-based materials have good wear resistance, but have the drawback of slippery on ice and snow roads.

On the other hand, a synthetic leather made of a synthetic resin mixed with animal hair powder has been proposed (Japanese Patent Laid-Open No. 3-45785, 457).
86, 45787), all of which relate to synthetic leather using a polyurethane resin, and no rubber composition is known.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a rubber composition which, when molded, has excellent slip resistance and does not impair wear resistance, and a rubber composition The object is to obtain molded products such as tires and footwear obtained by the above.

[0007]

Means for Solving the Problems The inventors have found that by incorporating keratin powder in a rubber composition, a molded product having excellent slip resistance can be obtained without impairing conventional rubber properties, The present invention has been completed. That is, the present invention relates to a rubber composition comprising natural rubber and / or synthetic rubber, containing 1 to 100 parts by weight of keratin powder to 100 parts by weight of a rubber component, and molding the same. The present invention relates to a tire tread and footwear obtained by

The rubber used in the present invention is a natural rubber (N
R) and / or one or more synthetic rubbers, or a mixture thereof are used. As the synthetic rubber, butadiene rubber (BR), styrene butadiene rubber (SBR), isoprene rubber (IR), butyl rubber, etc. are used.

The keratin powder referred to in the present invention is fibrous keratin powder such as animal hair fiber and feather fiber, or amorphous keratin powder such as horns and hooves, of which fibrous keratin is particularly preferred. Animal hair means animal hair obtained from animals such as sheep, goats, rabbits, camels, and alpaca, and feathers include poultry such as chickens, ducks, gooses, water birds such as ducks, pigeons, It means feathers obtained from birds such as ostriches. In the present invention, a powder obtained by crushing these is used. Average particle size of keratin powder is 1 μm
It is preferably 1 mm or less and more preferably 10 μm
˜200 μm is preferable. The grinding method is, for example, freeze grinding.

The keratin powder may be used alone or in combination. The total addition amount of these is generally 1 to 100 parts by weight, preferably 20 to 80 parts by weight, based on 100 parts by weight of the rubber component. If it is more than this range, the wear resistance is lowered, and if it is less than this, the slip resistance is lowered.

In addition to the above components, it goes without saying that other known resins, vulcanizing agents, vulcanization accelerators, antioxidants, fillers, reinforcing agents, tackifiers, coloring agents and the like can be added.
The rubber composition of the present invention is prepared by a conventional kneading method, for example,
It can be obtained by using a kneading roll, a kneader, a Banbury mixer, or the like.

By molding the rubber composition of the present invention into a tire tread, a shoe sole, etc., a product having excellent slip resistance can be obtained. The molding method is, for example, mold molding. Hereinafter, the present invention will be described in detail with reference to examples.

[0013]

【Example】

Test method Friction resistance index Tests were carried out using a constant speed rotary disc type friction tester. Ice having a smooth surface was fixed on a rotating disk having a diameter of about 20 cm, and a 3 cm × 5 cm test piece was pressed against this with a constant load (500 g). The frictional force applied to the test piece when the rotating disk was rotated at a constant speed was detected by a load cell. The value (index) is shown when the frictional force of the comparative sample is 100, and the larger the value, the better the frictional force, that is, the slip resistance.

Abrasion resistance index In the above test method, the asphalt was used as the surface material of the rotating plate, and the abrasion resistance ratio of the comparative sample was calculated as 100 from the residual amount ratio (abrasion resistance ratio) when rotating for a certain period of time. The value (index) when The larger the value, the better the wear resistance.

Example 1 Car tire tread NR 70 parts, BR 30 parts, carbon black (N33
0) 40 parts, naphthene oil 7 parts, zinc oxide 5 parts, stearic acid 2 parts, sulfur 3 parts, vulcanization accelerator (MBT) 1.4
Parts, 0.8 parts of anti-aging agent (PBN), and predetermined amounts of the natural keratin powder according to the present invention and the comparative additive described in Table 1 were thoroughly kneaded for 5 minutes with a Banbury mixer to prepare a rubber composition. . This was molded into the same tread and vulcanized at 160 ° C. for 20 minutes.

The obtained tire tread was evaluated for the performance test items shown in Table 1. As a result, as shown in the same table, it is clear that the tire tread obtained by the present invention is excellent in slip resistance, and also with respect to abrasion resistance, leather powder is inferior to the additive-free comparative sample. It was better than the added sample.

[0017]

[Table 1]

Example 2 Sole 100 parts SBR, 30 parts white carbon, 30 parts fatty acid-treated calcium carbonate, 30 parts light calcium carbonate, 10 parts titanium white, 5 parts coumarone resin, 5 parts naphthenic process oil, 1 wax Parts, stearic acid 1 part, amine-based surfactant 1.5 parts, sulfur 2 parts, vulcanization accelerator (DM) 2
Parts, vulcanization accelerator (TT) 0.25 parts, and each of the keratin powder according to the present invention and the additive for comparison described in Table 2 were thoroughly kneaded with a roll, and then shoes for tennis shoes. It was molded at the bottom and press-vulcanized at 130 ° C. for 30 minutes.

The obtained shoe sole was evaluated for performance in the same manner as in Example 1. As a result, as shown in Table 2, the shoe sole composition obtained according to the present invention had excellent slip resistance and abrasion resistance within a practical range.

[0020]

[Table 2]

[0021]

EFFECTS OF THE INVENTION Molded articles obtained from the rubber composition of the present invention, that is, tires and shoe soles have excellent slip resistance and wear resistance, and are therefore practically used as studless tires and shoe soles for slip prevention. It is very useful.

Claims (5)

[Claims] 1. A rubber composition comprising natural rubber and / or synthetic rubber, containing 1 to 100 parts by weight of keratin powder to 100 parts by weight of a rubber component. 2. The resin composition according to claim 1, wherein the keratin powder is animal hair powder and / or feather powder. 3. The keratin powder has an average particle size of 1 μm to 1 mm.
The resin composition according to claim 1, wherein 4. A tire comprising a tread obtained from the resin composition according to any one of claims 1 to 3. 5. Footwear comprising a shoe sole obtained from the resin composition according to any one of claims 1 to 3.