KR0131522B1 - Snow-tire and a process for preparing the same - Google Patents

Abstract

The invention relates to a snow tire which can perform the function of a spike snow tire as well as the function of a foam snow tire. The watersoluble crystalized base is mixed with a rubber compound for the tread of a tire so that a watersoluble crystalized base (1) exists in the inside of tire. As the tread portion wears due to running, the crystalized base (1) contained in the rubber compound of the tire tread portion appears on the surface and thereafter, a crystalized base (2) projected performs the function of a spike because the projected crystalized base (2) is harder than rubber. For the watersoluble crystalized base which is mixed in the rubber compound (3) for the tire tread, salt is available: watersoluble crystalized base of 10 ~ 100g portion to 100g portion is added and mixed, and the watersoluble crystalized base (1) of 30 ~ 500 micron in size is available. However, the size is formed within 80 micron. The invention improves power for towing and stopping.

Description

Snow tires and manufacturing method

1 is a cross-sectional explanatory diagram of a tire manufactured by the present invention,

2 (a), 2 (b) and 2 (c) are photographs taken by electron microscopy of the surfaces of tires produced in Examples 4 to 6 according to the present invention, respectively.

* Explanation of symbols for main parts of the drawings

1: crystal salt 2: protruding crystal salt

3: rubber composition 4: recessed portion

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to snow tires for automobiles. In particular, the water-soluble crystalline flames are separated from the tires or dissolved in water while incorporating the water-soluble crystalline flames in the cap tread, thereby allowing the crystalline flames to function as spikes. If it is, the flaw is formed in the part occupied by the water-soluble crystallization salt, and the flaw can perform the same function as the foam groove in the automobile tire made of foam rubber, thereby improving the traction and braking performance on ice and snow. It is to improve drainage performance when driving.

In order to improve the towing and braking performance on the ice surface, conventionally, spikes are installed on tires, inhaled hard powders such as glass, etc. are used on tread rubber compositions, or flexible polymers are used at low temperatures. The technique of mixing the crosslinked crushed rubber, forming the foamed rubber which formed the independent bubble, etc. is known. However, when the tire is spiked or mixed with hard powder, the tire tread surface is damaged and the road is damaged, causing dust pollution. When using low temperature flexible polymer or incorporating crosslinked crushed rubber, ice sheet braking performance is achieved. This is not satisfactory, and there is a drawback that the steering safety is lowered and the wear resistance is lowered. In addition, the above known technology of foamed rubber made by using a low temperature softener to have an independent bubble in the rubber has only a part that is concave by bubbles in the tread surface, and there is a drawback that the drainage is not easy without a protruding part. The processing technology was very complex and the manufacturing costs were excessively flawed.

Accordingly, an object of the present invention is to provide a snow tire capable of simultaneously performing a role of a spike or a STUDESS snow tire in a snow tire and simultaneously serving as a snow tire made of foam rubber.

Hereinafter, the present invention will be described in detail.

The present invention provides a snow tire and a method for producing the same, which are prepared by mixing 10-100 parts by weight of a water-soluble crystalline salt with respect to 100 parts by weight of a rubber composition for tire tread. Hereinafter, the present invention will be described in more detail.

1 is an explanatory view of a surface cross section of a tire produced by the present invention.

That is, the water-soluble crystalline salt (1) is mixed and vulcanized into the rubber tread rubber composition of the tire so that the water-soluble crystalline salt (1) is present in the solid state, and the tread portion of the tire is worn when the tread portion is worn as the vehicle runs. The crystallized salt 1 contained in the rubber composition protrudes to the surface, and then the protruding crystallized salt 2 has a higher hardness than the rubber, thereby acting as a spike.

The crystallized salt mixed in the tire tread rubber composition 3 is preferably salt (NaCl), and preferably mixed with 10-100 parts by weight of a water-soluble crystallized salt with respect to 100 parts by weight of the rubber composition.

In addition, the size of the water-soluble crystallization salt (1) is preferably 30-500 microns (μm), but more preferably formed within a size of 80 microns (μm). If the size of the crystallization salt is too large, there is a risk of harming the tensile strength of the rubber composition.

In addition, it is preferable to distribute the crystal salt (1) of about 50-100 pieces / mm ² of the rubber composition. Outside the above range, since the number of molecules of the bonded rubber per fracture area decreases, the physical properties of the rubber composition may decrease.

According to the present invention, the water-soluble crystalline flame protruding from the surface of the tread portion of the tire is dissolved in water of the road surface during vehicle driving or is separated from the rubber composition 3 to form the recessed portion 4, and the concave portion 4 is the road surface. It improves braking performance by facilitating drainage between the tire tread and the tire tread and improves traction and braking performance by performing a function like a groove in a tire made of foam rubber.

For example, the water-soluble crystallization salt, such as salt, used in the present invention, since the initial size is not broken after mixing, and is maintained as it is, the grooves generated by the separation of the water-soluble crystallization salt are determined according to the size of the crystallization salt to be blended. The number of grooves is determined by the amount of crystallized salt to be blended.

In addition, dissolution of crystalline salt (NaCl) does not occur even when the unvulcanized rubber composition containing NaCl according to the present invention is left at room temperature for about one week.

In addition, the dispersibility of the crystallized salt in the rubber composition was found to be good.

The snow tire manufactured by the manufacturing method of the present invention as described above, while having both the mounting effect of the spike and the advantages of the tire made of foam rubber, not only does not generate pollution such as dust during running, in particular during tire manufacturing There is an advantage that the raw material cost can be greatly reduced compared to the snow tire made of foam rubber without requiring special properties in rubber. In addition, the present invention has the advantage that the size and distribution of the grooves caused by the departure of the crystal salt is uniformly formed because the crystal is not destroyed even if the rubber mixed with a water-soluble crystal salt is mixed with a banbury mixer or roll. have.

Hereinafter, the present invention will be described in more detail with reference to Examples. The present invention is not limited by the following Examples.

[Examples 1 to 6]

The master batch was prepared by mixing well in a Benbury mixer with a composition as shown in Table 1, and then manufacturing a tire through a conventional manufacturing process, and the physical property test of the tire tread portion of the tire was carried out as follows. Shown in

Comparative Example 1

Physical property test values of conventional snow tires (manufactured with foam rubber for 918 patterns) are shown in Table 1 below.

[Property Test]

The following tests were all measured by the test regulations of ASTM-D1456-86.

i) hardness test

This test stipulates the hardness measurement of rubber. In the present invention, the spring hardness tester (SHORE-A) was used.

ii) Modulus measurement (Stress at 300% elongation, M300) This is the stress when a specific elongation is given to the rubber test piece. In this test, the elongation at 300% was measured.

iii) elongation measurement (Eb)

In the elongation test, the rubber was stretched to a certain length and maintained for a certain time, and then rapidly contracted to measure the residual after a certain time.

iv) tensile strength test (Tb)

Tensile strength was measured by measuring the maximum load that would break when the rubber was tensioned.

[Dynamic Friction Coefficient (μ) Test]

a) wet traction

The tires manufactured in Examples 4 to 6 and the tires prepared in Comparative Example 1 were mounted on a passenger car, and run at a constant speed (40 km / hr and 60 km / hr) on an asphalt on which a water film was formed at room temperature (about 23 ° C.). The wet dynamic friction test was measured, and the results are shown in Table 2 below. The apparatus used at the time of this friction coefficient test used the SUNNY KOKEN company of Japan.

b) ice traction

The tires prepared in Examples 4 to 6 and the tires prepared in Comparative Example 1 were mounted on a passenger car, and the ice dynamic friction test was performed while driving on the ice at a constant speed (40 km / hr and km / hr) at about -10 ° C. The measurement results are shown in Table 3 below.

In Table 3, * has no re-power so that the friction coefficient cannot be measured.

In addition, it was observed by an electron microscope to determine whether the crystal flame is uniformly distributed in the tread portion of the snow tire according to the present invention. That is, FIGS. 2A, 2B and 2C are photographs taken by electron microscopy of the surfaces of tires manufactured according to Examples 4 to 6 according to the present invention, respectively. That is, as shown in FIG. 2, the surface of the tire contained NaCl particles.

Claims (6)

10 to 100 parts by weight of a water-soluble crystallization salt is mixed with 100 parts by weight of a rubber composition of a tread part of a tire. The snow tire of claim 1, wherein the water-soluble crystallization salt is a salt (NaCl) having a particle size of 30 to 500 µm. The snow tire according to claim 1 or 2, wherein the water-soluble crystallization flame is contained in the cross section of the rubber composition for the frying tire tread. 10 to 100 parts by weight of a water-soluble crystallization salt is prepared by mixing 100 parts by weight of a rubber composition for a tire tread. The method of claim 4, wherein the water-soluble crystallization salt is a manufacturing method of the snow tire, characterized in that the salt (NaCl) of the particle size of 30 to 500㎛. The method for producing a snow tire according to claim 4 or 5, wherein the water-soluble crystallization salt is contained in the cross section of the rubber tread rubber composition in a range of 50 to 100 pieces / mm 2.