KR100638626B1 - Tire rubber composition improved fatigue property - Google Patents

Abstract

Provided are a rubber composition for a tire which is remarkably improved in fatigue resistance characteristics, and a tire containing the sidewall comprising the composition. The rubber composition comprises 30-35 parts by weight of the carbon black (N330) which has a N2 adsorption specific surface area of 78 m^2/g, a STSA (statistical thickness surface area) of 75 m^2/g, an iodine adsorption number of 76-84 g/kg, a DBP oil absorption of 98-106 mL/100 g, a CDBPA of 88 mL/100g, a CTAB of 82 m^2/g and a degree of coloration of 102 %; 40-50 parts by weight of the carbon black (N660) which has a N2 adsorption specific surface area of 35 m^2/g, a STSA of 34 m^2/g, an iodine adsorption number of 32-40 g/kg, a DBP oil absorption of 87-95 mL/100 g, a CDBPA of 74 mL/100g, a CTAB of 36 m^2/g and a degree of coloration of 56 %; and 0.5-1.5 parts by weight of N-dicyclohexyl-2-benzothiazole sulfonamide as a vulcanization accelerator, based on 100 parts by weight of a rubber material.

Description

Rubber composition for tires with improved fatigue resistance {TIRE RUBBER COMPOSITION IMPROVED FATIGUE PROPERTY}

The present invention relates to a rubber composition for tires with improved fatigue resistance, and more specifically, 30 to 35 parts by weight of N330 carbon black, 45 to 50 parts by weight of N660 carbon black, and vulcanization accelerator DZ based on 100 parts by weight of raw material rubber. It relates to a rubber composition for a tire applied 0.5 to 1.5 parts by weight.

With the development of automobile civilization and being used from the time of development until now, many people know that tires are used only as a function of vehicle support and transportation. However, with the recent development of the global economy and technological prowess, the importance of tire function is emerging in various fields, and the demand characteristics of consumers are rapidly changing accordingly, and the performance of tires is also proportionally improved due to the improvement of the performance of the vehicle. Therefore, it is urgent to develop a tire having a new performance that can meet this.

The typical trend of truck / bus tires is that of long-term use characteristics rather than general passenger tires. In particular, tires for trucks / buses are relatively expensive products and have a large variation in the service life due to tire performance. In addition, since consumers are required to use additional recycling according to long-term use, it is very important to maintain fatigue resistance according to long-term use of tires, and it is necessary to develop a rubber composition that can maintain fatigue resistance for a long time.

It is known that reinforcement of the carcass is essential in order to use the tire for a long time and to maintain the performance similar to or higher than that of the new tire even after regeneration. Since the carcass unit supports excessive loads and burdens from the vehicle against the air pressure, stabilization of the carcass layer is known as an essential condition for securing long-term durability. The backing layer is used to distinguish the carcass part from the inner liner part which is in direct contact with the air pressure. Giving functions.

In general, in the case of long-run tires, since the carcass layer is gradually destroyed after the backup layer is first destroyed, the present invention improves the fatigue resistance of the backup layer to protect the carcass and at the same time long-term durability. It is intended to invent a rubber composition that improves.

In order to solve this problem, US Pat. No. 6,519,925 improves fatigue resistance by using multi-filamentary yarns, and US Pat. No. 6,6427736 uses invention to improve fatigue resistance of pneumatic tires using cellulose fibers. Was done.

The present invention is to improve the above problems, an object of the present invention is to improve the long-term durability by using a rubber composition that can protect the carcass layer which has an important effect on the durability of the tire in the backup layer fatigue resistance characteristics The improved rubber composition for a tire is provided.

The present invention relates to a rubber composition for tires with improved fatigue resistance, and more specifically, 30 to 35 parts by weight of N330 carbon black, 45 to 50 parts by weight of N660 carbon black, and vulcanization accelerator DZ based on 100 parts by weight of raw material rubber. It relates to a rubber composition for a tire applied 0.5 to 1.5 parts by weight.

30-35 weight part is preferable and, as for content of N330 carbon black, 32-34 weight part is more preferable.

As for content of N660 carbon black, 45-50 weight part is preferable, and 46-48 weight part is more preferable.

The rubber composition for a tire of the present invention is used by mixing N330 and N660 as the carbon black in the content range as described above, thereby improving fatigue resistance of the rubber composition and long-term durability of the finished tire.

The main properties and main features of the carbon blacks (trade names; N330, N660) used in the present invention are as follows.

Manufacturer: COLUMBIAN CHEMICALS COMPANY CO., LTD

Composition N330 N660 Nitrogen adsorption specific surface area value; NSA (㎡ / g) 78 35 STSA (㎡ / g) 75 34 Iodine adsorption value; IODINE (g / kg) 76-84 32-40 DBP oil absorption; DBPA (mL / 100 g) 98-106 87-95 CDBPA (mL / 100 g) 88 74 CTAB (㎡ / g) 82 36 Degree of coloring; TINT (% IRTB) 102 56

week)

ㆍ STSA (Statistical Thickness Surface Area): External specific surface area of carbon black.

ㆍ CDBPA: It is a measure of the structure, and the oil absorption is measured after breaking by applying 4 times of shear compression at 24Mpa pressure.

CTAB: It is measured using cetyltrimethylammonium bromide as a method of measuring specific surface area, that is, carbon particle size, similarly to iodine adsorption value and nitrogen adsorption value.

The vulcanization accelerator DZ used in the present invention is N-dicyclohexyl-2-benzothiazolesulfonamide, and 0.5 to 1.5 parts by weight of a BAYER company is preferably used. If the amount of the DZ exceeds 1.5 parts by weight, the vulcanization rate is so fast that a crosslinking reaction occurs before the smooth bonding between the rubber compositions, so that the desired rubber composition cannot be obtained. If the amount is less than 0.5 parts by weight, the vulcanization time becomes long, which causes process instability and an increase in manufacturing cost.

The present invention can be understood in more detail by the following examples and comparative examples, the following examples are only for illustrating the present invention, and are not intended to limit the protection scope of the present invention.

Examples and Comparative Examples

A rubber composition was prepared according to the composition shown in Table 1, the basic physical properties and fatigue resistance were measured, and the results are shown in Tables 2 and 3, respectively.

The mixing ratios shown in Table 1 were sheeted in a mill maintained at 100 ° C. after kneading at a chamber temperature of 90 ° C. for less than 4 minutes and 30 seconds at a rotational speed of 60 RPM. The seated rubber compound was added to a vulcanizing agent at a half-barrier chamber temperature of 80 ° C. or less, and then mixed for 2 minutes and quenched at 145 ° C. for 30 minutes to carry out fatigue resistance test.

ㆍ Rubber: used STR-10K by Soviet Union

ㆍ MANOBOND: COBALT BORONEODECANOATE (Adhesive Promoter), Taekwang Fine Chemical.

B-18-S: Resorcinol formaldehyde resin (adhesive), INDSPEC (PITSUBURG, USA).

MOR: N-oxydiethylene-2-benzothiazole-sulfenamide (a vulcanization accelerator), the Tong Yang Steel Chemical Co., Ltd. product.

ㆍ SULFASAN: 4,4-Dithiodimorpholine (vulcanization accelerator), Shanghai Kyunghwa Chemical (China).

PVI: N-cyclohexylthioptalimide (vulcanization delaying agent), a lysing emulsifier.

Sulfur: 80% -Crystex

CYREZ964: Hexa-methoxy-methyl-melamine (HMMM) (65%) + HISIL 233 (35%) (adhesive), manufactured by Kumho Petrochemical Co., Ltd.

-Fatigue resistance was recorded as the amount of crack growth after 30,000 repeated refractions using a DIMATIA tester, indicating that the less crack growth is a rubber composition with greater fatigue resistance effect.

As can be seen from the results of the above examples, fatigue resistance by long-term repetition can be improved by using variably applying N330 carbon black and N660 carbon black.

As can be seen from the above comparative examples and examples, the rubber composition for tires with improved fatigue resistance produced by the present invention has an effect of significantly improving fatigue resistance.

Claims (2)

Nitrogen adsorption specific surface area value is 78 m2 / g, STSA is 75 m2 / g, iodine adsorption value is 76-84 g / kg, DBP oil absorption is 98-106 mL / 100 g, and CDBPA 30 to 35 parts by weight of carbon black having 88 mL / 100 g, CTAB of 82 m 2 / g, 102% coloration, nitrogen adsorption specific surface area of 35 m 2 / g, STSA of 34 m 2 / g, and iodine adsorption value of 32 45-50 parts by weight of carbon black with ~ 40 g / kg, DBP oil absorption of 87-95 mL / 100 g, CDBPA of 74 mL / 100 g, CTAB of 36 m2 / g, coloration of 56%, and as a vulcanization accelerator. Rubber composition for tires with improved fatigue resistance characterized in that it comprises 0.5 to 1.5 parts by weight of clohexyl-2-benzothiazolesulfonamide. A tire made of the rubber composition for tires of claim 1.