KR100803318B1 - Rubber composition for tire comprising chain type carbon black - Google Patents

Abstract

A rubber composition for a tire, and a tire containing the rubber prepared from the composition are provided to prevent a component contained in rubber from being effused from a tire. A rubber composition comprises 0.1-20 parts by weight of the chained carbon black having arrangement or orientation based on 100 parts by weight of a rubber material. Preferably the chained carbon black having arrangement or orientation has a DBP absorption of 170-190 mL/100 g and an iodine adsorption number of 180-200 gm/g.

Description

Rubber composition for tire comprising chain type carbon black}

1 is a photograph showing amorphous carbon black.

2 is a photograph showing a chain carbon black.

Figure 3 is a photograph showing that the anti-aging agent flows to the outside of the tire in the conventional tire.

Figure 4 is a photograph showing that the anti-aging agent flows to the outside of the tire of the present invention.

Figure 5 is a photograph showing the appearance of the rubber specimen prepared in Comparative Example 1.

Figure 6 is a photograph showing the appearance of the rubber specimen prepared in Comparative Example 2.

Figure 7 is a photograph showing the appearance of the rubber specimen prepared in Example 1.

Figure 8 is a photograph showing the appearance of the rubber specimen prepared in Example 2.

The present invention relates to a rubber composition for a tire comprising a chain carbon black, and more particularly, to a tire comprising a rubber composition comprising a chain carbon black having a longitudinal or transverse direction. SUMMARY OF THE INVENTION An object of the present invention is to provide a rubber composition for a tire which can prevent the components added to the rubber from flowing out of the tire appearance due to the dispersed form of the chain carbon black having a longitudinal or transverse direction.

The tire consists of an exterior that is immediately visible to the eye and an internal configuration that is not immediately visible to the eye.

The part that is directly visible is typical of the tread part that is in direct contact with the ground, and the sidewall part that is the side part of the tire where various information about the tire is written. There are parts such as casing, tire cord and under tread.

Tires have different required properties for different parts. For example, the sidewall of the side of the tire should have excellent ozone resistance and crack resistance.

In the conventional rubber composition for tires, carbon black used as one of the reinforcing fillers generally uses amorphous carbon black as shown in FIG. 1.

After the tire sidewall is manufactured with a tire rubber composition including amorphous carbon black as shown in FIG. 1 and other various additives, as shown in FIG. 3, an additive such as an anti-aging agent and wax flows into the exterior of the tire as shown in FIG. 3. Not only the appearance of poor appearance, but the additives such as the anti-aging agent, wax flows into the tire appearance, there is a problem that ultimately reduce the ozone resistance and crack resistance of the tire.

In the present invention, while trying to solve the above-mentioned problems, the carbon black used as the reinforcing filler is not the intangible carbon black as shown in FIG. 1 but the chain carbon black having the directional direction in the longitudinal or transverse direction as shown in FIG. 2 and the sidewall of the tire is manufactured with a rubber composition for the tire comprising a chain carbon black having a directionality as shown in FIG. 2, as shown in FIG. Therefore, it was found that a rubber composition for a tire can be obtained without contaminating the appearance of the tire and ultimately reducing ozone resistance and crack resistance.

Therefore, in the rubber composition for tires of the present invention, in the rubber composition for tires, when the chain carbon black having the directionality in the longitudinal or transverse direction is added, the anti-aging agent, the wax or the like is dispersed by the dispersion of the aromatic chain carbon black. It is possible to obtain a rubber composition for a tire in which an additive or the like is prevented from flowing out of the tire appearance, thereby contaminating the appearance of the tire, and ultimately improving ozone resistance and crack resistance.

Meanwhile, Korean Patent Laid-Open Publication No. 2000-0046695 as a related art related to the present invention provides a rubber composition for sidewalls made of diene rubber, ethylene propylene diene terpolymer rubber, halogenated butyl rubber, and low molecular liquid isobutylene rubber. An object of the present invention is to maintain physical properties such as tensile strength, tear strength and crack growth resistance, fatigue resistance while preventing the appearance discoloration of the rubber composition. However, in the present invention, the work processability is lowered according to the application of various kinds of raw rubbers, and the fairness of the compounded rubber, that is, the scorch stability is decreased due to the application of the halogenated butyl rubber. In addition, if the low molecular weight liquid isobutylene rubber is not treated carefully in the working process, there is a fear that there may be a deviation in the physical properties of the rubber compounded in the batch type.

In another prior art related to the present invention, Korean Patent Laid-Open Publication No. 1998-0036876 proposes to divide a rubber composition by dualizing a tire sidewall into an inner layer and an outer layer. The patent proposes to apply a rubber composition having excellent ozone resistance to the inner layer or the outer layer by extruding the side wall in a double. However, in order to double-extrude the sidewall, it is necessary to modify the extrusion equipment or to install new equipment. If there is a difference in physical properties between the extrudate of the extruded sidewall, the dimensional stability decreases and affects the assembly process such as green case molding. And ultimately affect tire performance.

As another prior art related to the present invention, Exxon Chemical Co., Ltd., at ITEC (International Exbition and Conference) in 1998, isobutylene, bromo-para-methylstyrene, para-methylstyrene terpolymer rubber The results of the study to improve the ozone resistance of the composition were published. In this study, the isobutylene moiety in the terpolymer copolymer interfered with ozone permeability, and the rest of the content suggested that the interactions with the filler and the physical properties were secured. However, in the above publication, methyl styrene group containing bromide is applied as a reaction site for vulcanization, and thus there is a fairness problem such as decrease in scorch stability.

The prior art is to prevent the additives such as anti-aging agent, wax, etc. to the tire appearance by dispersing the aromatic chain carbon black in the tire rubber composition containing the aromatic chain carbon black, the ultimate The technical configuration is different from the present invention showing the rubber composition for the tire is improved ozone resistance and crack resistance.

The present invention has been proposed to solve the problems of the prior art as described above, by applying an aromatic chain carbon black to the rubber composition for tires, such as anti-aging agent, wax, etc. that can affect the ozone resistance It is an object of the present invention to provide a rubber composition for a tire that prevents the additive from flowing out of the tire appearance and disappears, thereby ultimately improving ozone resistance and crack resistance.

The rubber composition for tires of the present invention can be applied to sidewall portions of tires.

Another object of the present invention is to provide a tire including a rubber made of a rubber composition for a tire comprising the chain carbon black having the aforementioned directionality.

The present invention relates to a rubber composition for a tire comprising a chain-shaped carbon black having aromaticity in a rubber composition for a tire.

In the rubber composition for tires of the present invention, the raw rubber may be natural rubber, synthetic rubber, or mixed rubber mixed with natural rubber and synthetic rubber.

When the mixed rubber mixed with natural rubber and synthetic rubber is used as the raw material rubber, the mixed rubber mixed with 10 to 90 parts by weight of natural rubber and 10 to 90 parts by weight of synthetic rubber may be used among 100 parts by weight of raw rubber.

In the above synthetic rubber, one kind of synthetic rubber may be used as a raw material rubber, and raw synthetic rubber may be used as a mixed synthetic rubber in which two or more synthetic rubbers are mixed.

The synthetic rubber may be any one or more selected from styrene butadiene rubber, butadiene rubber, butyl rubber, halogenated butyl rubber, styrene butadiene rubber containing isoprene, styrene butadiene rubber including nitrile and neoprene rubber.

As an example of the raw rubber, styrene butadiene rubber (SBR) having a vinyl content of 50 to 60% and a styrene content of 10 to 15% may be used.

As an example of the raw rubber, styrene butadiene rubber having a vinyl content of 65 to 75% and a styrene content of 20 to 25% may be used.

Examples of the raw material rubbers include styrene butadiene rubber (SBR) having a vinyl content of 50 to 60%, a styrene content of 10 to 15%, and a styrene butadiene rubber having a vinyl content of 65 to 75% and a styrene content of 20 to 25%. Mixed rubber can be used.

As an example of the raw material rubber, the vinyl content of 50 to 60%, the styrene content of 10 to 15% of styrene butadiene rubber (SBR) and the vinyl content of 65 to 75%, styrene of 100 parts by weight of the raw material rubber Styrene butadiene rubber having a content of 20 to 25% may use 10 to 90 parts by weight of mixed rubber.

In the present invention, the chain carbon black having a direction has a certain direction in the longitudinal or transverse direction, and has a chain (chain) shape when the chain carbon black having the direction is added to the rubber composition in the longitudinal or transverse direction It is dispersed in the direction of. Due to this dispersion form, the rubber composition for the tire prevents additives such as anti-aging agents and waxes from flowing out of the tire exterior during the manufacture of the tire, preferably tire sidewall rubber, to prevent the tire from being contaminated. Ultimately, the ozone resistance and crack resistance of tire sidewall rubber can be improved.

The chain carbon black having the aromaticity in the above has a direction in the longitudinal or transverse direction, DBP adsorption value can be used that is 170 ~ 190ml / 100g.

In the above-described aromatic carbon black chain having a directional direction in the longitudinal or transverse direction, the iodine adsorption value of 180 to 200 mg / g can be used.

In the above-mentioned chain carbon black having a directional direction has a direction in the longitudinal or transverse direction, DBP adsorption value of 170 ~ 190ml / 100g, iodine adsorption value of 180 ~ 200mg / g can be used.

The present invention relates to a rubber composition for a tire comprising 0.1 to 20 parts by weight of a chain carbon black having an orientation with respect to 100 parts by weight of the raw rubber.

In the rubber composition for tires of the present invention, the tire rubber composition is applied under various conditions such as various components and contents. In order to achieve the object of the present invention, it is understood that the rubber composition for tires under the conditions mentioned above is preferable. Could.

According to the present invention, various additives such as reinforcing fillers, activators, anti-aging agents, process oils, vulcanizing agents, and vulcanization accelerators, which are used in rubber compositions for tires, in addition to the raw rubbers and aromatic carbon blacks mentioned above, are needed. It can be used at a predetermined content by selecting an enemy. However, these are general components used in a rubber composition for a tire and are not essential components of the present invention.

On the other hand, the present invention includes a rubber produced by the above-mentioned tire rubber composition.

The present invention includes a tire containing as a tread the rubber produced by the above-mentioned rubber composition for tires.

The tire represents any one selected from a tire for an automobile, a tire for a bus, a tire for a truck, an tire for an aircraft, and a tire for a motorcycle.

Hereinafter, the present invention will be described by the following comparative examples, examples and test examples. However, these are not limited to the scope of the present invention by these as an embodiment of the present invention.

Comparative Example 1

5 parts by weight of aromatic oil, DBP adsorption value of 91ml / 100g, iodine adsorption of 36mg / g, and amorphous carbon black (N660) based on 100 parts by weight of raw rubber consisting of 60 parts by weight of natural rubber and 40 parts by weight of butadiene rubber ) 50 parts by weight, 3 parts by weight of zinc oxide, 2 parts by weight of stearic acid, 2 parts by weight of anti-aging agent (TMDQ, Polymerized 2,2,4-trimethyl-1,2-dihydroquinoline), 2 parts by weight of wax, sulfur as vulcanization system 2 parts by weight, 1 part by weight of a vulcanization accelerator (NS, N-tert-butyl-2-benzothiazolesulfenamide) was placed in a Banbury mixer and vulcanized at 160 ° C. for 25 minutes to prepare a rubber specimen.

Comparative Example 2

5 parts by weight of aromatic oil, DBP adsorption value of 91ml / 100g, iodine adsorption of 36mg / g, and amorphous carbon black (N660) based on 100 parts by weight of raw rubber consisting of 60 parts by weight of natural rubber and 40 parts by weight of butadiene rubber 40 parts by weight and 10 parts by weight of carbon black (N103) having a DBP adsorption value of 130 ml / 100 g and iodine adsorption of 140 mg / g, 3 parts by weight of zinc oxide, 2 parts by weight of stearic acid, 2 parts by weight of an antioxidant (TMDQ), wax 2 2 parts by weight of sulfur and 1 part by weight of vulcanization accelerator (NS) were added to a Banbury mixer and vulcanized at 160 ° C. for 25 minutes to prepare rubber specimens.

<Example 1>

5 parts by weight of aromatic oil, DBP adsorption value of 91ml / 100g, iodine adsorption of 36mg / g, 40 parts by weight of amorphous carbon black as shown in FIG. 1 with respect to 100 parts by weight of raw rubber consisting of 60 parts by weight of natural rubber and 40 parts by weight of butadiene rubber (N660) and DBP adsorption value of 177ml / 100g, iodine adsorption of 185mg / g, 10 parts by weight of chain carbon black as shown in Figure 2, 3 parts by weight of zinc oxide, 2 parts by weight of stearic acid, 2 parts by weight of antioxidant (TMDQ) 2 parts by weight of wax, 2 parts by weight of sulfur as a vulcanization system, and 1 part by weight of vulcanization accelerator (NS) were placed in a Banbury mixer and vulcanized at 160 ° C. for 25 minutes to prepare a rubber specimen.

<Example 2>

5 parts by weight of aromatic oil, 100 parts by weight of raw rubber consisting of 60 parts by weight of natural rubber and 40 parts by weight of butadiene rubber, 30 parts by weight of carbon black (N660) having a DBP adsorption value of 91 ml / 100g, and an iodine adsorption value of 36 mg / g Is 177ml / 100g, iodine adsorption is 185mg / g, 20 parts by weight of chain carbon black, 3 parts by weight of zinc oxide, 2 parts by weight of stearic acid, 2 parts by weight of antioxidant (TMDQ), 2 parts by weight of wax, vulcanized As a system, 2 parts by weight of sulfur and 1 part by weight of vulcanization accelerator (NS) were placed in a Banbury mixer and vulcanized at 160 ° C. for 25 minutes to prepare a rubber specimen.

Table 1. Rubber compositions of Comparative Examples and Examples (unit: parts by weight)

division Comparative Example 1 Comparative Example 2 Example 1 Example 2 Natural rubber 60 60 60 60 Butadiene rubber 40 40 40 40 Aromatic Oil 5 5 5 5 Carbon black (N660) 50 40 40 30 Carbon black (N103) 0 10 0 0 Chain carbon black 0 0 10 20 Zinc oxide 3 3 3 3 Stearic acid 2 2 2 2 Anti-aging 2 2 2 2 Wax 2 2 2 2 sulfur 2 2 2 2 Vulcanization accelerator One One One One

<Test Example 1>

The rubber specimens prepared in Comparative Examples and Examples were measured for physical properties such as hardness, 300% modulus, tensile strength, and elongation by ASTM-related regulations, and the results are shown in Table 2 below.

Table 2. Comparative Example and Example Rubber Specimen Property Test Results

construction Comparative Example 1 Comparative Example 2 Example 1 Example 2 Properties Hardness 100 107 104 108 300% modulus 100 108 102 106 The tensile strength 100 115 106 110 Elongation 100 95 100 103

In Table 2, the physical property values of Comparative Examples 2 and 1 and 1 are converted when the value of Comparative Example 1 is 100, and the higher the value, the better the physical properties.

<Test Example 2>

The ozone resistance of the rubber specimens prepared in Comparative Examples and Examples was measured by ASTM-related regulations, and the results are shown in FIGS. 5 to 8.

In the ozone resistance test, the vulcanized rubber specimens with 20% elongation were stored for 72 hours in a chamber maintaining an ozone concentration of 50 ppm at a temperature of 40 ° C., and then the appearance characteristics were evaluated.

5 is a photograph showing the appearance of the rubber specimen prepared in Comparative Example 1, Figure 6 is a photograph showing the appearance of the rubber specimen prepared in Comparative Example 2.

7 is a photograph showing the appearance of the rubber specimen prepared in Example 1, Figure 8 is a photograph showing the appearance of the rubber specimen prepared in Example 2.

Rubber specimens of Examples 1 and 2 prepared from the rubber composition containing the chain carbon black of the present invention as in the result of Test Example 1 of Comparative Examples 1 and 2 prepared from the rubber composition containing no chain carbon black. Compared with the rubber specimens, the rubber specimens of Examples 1 and 2 having the same or higher physical properties, and also the external appearance of the rubber specimens of FIGS. 5 to 8 are made of the rubber composition containing the chain carbon black of the present invention. 7 and 8 are more excellent in appearance characteristics than in FIGS. 5 and 6, which are rubber samples of Comparative Examples 1 and 2, which are made of a rubber composition to which aromatic carbon black is not applied.

This is because the aromatic carbon black having the aromatic structure of the present invention has an advanced structure and surface area, which may affect the physical properties. Also, due to the dispersed form of the aromatic carbon black, additives such as anti-aging agents and waxes may be applied to the tire appearance. It can be seen that it is possible to provide a rubber composition for tires that prevents the appearance of tires and prevents contamination of the tire appearance and ultimately improves ozone resistance and crack resistance.

Claims (4)

In the rubber composition for tires, Rubber composition for tires containing a chain carbon black having a directional. The rubber composition for a tire according to claim 1, comprising 0.1 to 20 parts by weight of a chain carbon black having an orientation with respect to 100 parts by weight of the raw material rubber. The rubber composition for tires according to claim 1, wherein the aromatic chain carbon black has a DBP adsorption value of 170 to 190 ml / 100 g and an iodine adsorption value of 180 to 200 mg / g. A tire comprising a rubber comprising the rubber composition for tires according to claim 1.

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