KR101314581B1

KR101314581B1 - Rubber composition for tire inner liner and tire manufactured by using the same

Info

Publication number: KR101314581B1
Application number: KR1020100118646A
Authority: KR
Inventors: 강아라; 강철한; 김학주
Original assignee: 한국타이어 주식회사
Priority date: 2010-11-26
Filing date: 2010-11-26
Publication date: 2013-10-07
Also published as: KR20120057074A

Abstract

The present invention is 100 parts by weight of the raw material rubber containing epoxidized natural rubber having an epoxy group content of 20 to 60 mol%, 60 to 95 parts by weight of non-petroleum raw materials including silica and natural oil, and 2 to 22 parts by weight of silane coupling agent. It relates to a rubber composition for a tire inner liner comprising and a tire inner liner produced using the same.
According to an embodiment of the present invention, it is possible to produce an environmentally friendly rubber composition for the inner liner by maximizing the content of non-petroleum-based raw materials in the entire rubber composition, and various physical properties required for the inner liner are equivalent to those of the conventional rubber composition. It has a sustainable effect.

Description

RUBBER COMPOSITION FOR TIRE INNER LINER AND TIRE MANUFACTURED BY USING THE SAME}

The present invention relates to a rubber composition for an inner liner and a tire manufactured using the same, and more particularly, to an environment-friendly rubber composition for an inner liner and a tire manufactured by maximizing the content of non-petroleum-based raw materials in the rubber composition. It is about.

The rubber currently used as an inner liner is butyl rubber. The reason for using it is that it has the performance required for the innerliner such as air permeability, crack resistance, and adhesion.

In addition, tires currently on the market are made using petroleum resources more than 60% of the total weight. For example, a typical radial tire for a passenger car contains 25% of the total weight of synthetic rubber, 20% of carbon black and 15% of aromatic oils. have.

Since the use of such petroleum resources is shown to be limited, there is an urgent need for a method for manufacturing tires using materials that can replace petroleum.

In particular, considering that most tire rubber compositions are currently focused on treads, it can be said that the use of non-petroleum-based raw materials for the innerliner composition is revolutionary.

Accordingly, the present invention is to solve the problems of the prior art as described above, and replace the rubber composition of the inner liner which is not currently focused with non-petroleum-based raw materials, as well as for the inner liner with improved air permeability and adhesion. It is an object to provide a rubber composition.

Another object of the present invention is to provide a tire inner liner obtained using the rubber composition for inner liner.

In order to achieve the above object, the rubber composition for the inner liner according to an embodiment of the present invention comprises 100 parts by weight of raw rubber, including epoxidized natural rubber having an epoxy group content of 20 to 60 mol%, silica and natural oil 60 to 95 parts by weight of the non-petroleum raw material, and 2 to 22 parts by weight of the silane coupling agent may be included.

The silica may be included in 50 to 70 parts by weight based on 100 parts by weight of the raw material rubber.

The silica may have a BET surface area of 140 to 260 m 2 / g.

The natural oil may be included in 5 to 25 parts by weight based on 100 parts by weight of the raw rubber.

The natural oil may include at least one selected from the group consisting of vegetable oil, semi-dry oil of 100 to 130 oxo, and undried oil of 100 or less oxo.

The vegetable oil may include one or more selected from the group consisting of palm oil, grape seed oil, jojoba oil, camellia oil, castor oil, soybean oil, and sunflower seed oil.

The tire inner liner rubber composition may further include an aromatic oil within 10 parts by weight based on 100 parts by weight of the raw rubber.

The silane coupling agent may be selected from bis (triethoxysilylpropyl) disulfide (TESPD) and bis (triethoxysilylpropyl) tetrasulfide (TESPT).

In addition, in order to achieve the above further another object, according to an embodiment of the present invention may be an inner liner tire manufactured using the rubber composition.

According to an embodiment of the present invention, it is possible to produce an environmentally friendly rubber composition for the inner liner by maximizing the content of non-petroleum-based raw materials in the entire rubber composition, and various physical properties required for the inner liner are equivalent to those of the conventional rubber composition. It has a sustainable effect.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a," "an," and "the" include singular forms unless the context clearly dictates otherwise. Also, " comprise "and / or" comprising "when used herein should be interpreted as specifying the presence of stated shapes, numbers, steps, operations, elements, elements, and / And does not preclude the presence or addition of one or more other features, integers, operations, elements, elements, and / or groups.

Hereinafter, the present invention will be described in more detail.

The rubber composition for a tire inner liner according to the present invention uses an epoxidized natural rubber having an epoxy group as a natural rubber as a raw material rubber, silica as a reinforcing material, and contains the maximum amount of natural oil in the total oil. In addition to improving air permeability and adhesion, alternative raw materials have been applied due to the depletion of petroleum resources.

The rubber composition for a tire inner liner according to the present invention includes 60 to 95 parts by weight of the non-petroleum raw material and 2 to 22 parts by weight of the silane coupling agent based on 100 parts by weight of the raw material rubber.

The rubber used in the present invention uses epoxidized natural rubber which is a kind of modified natural rubber. That is, by using a natural rubber, rather than using a synthetic rubber as in the prior art has the advantage that can be prepared for problems caused by the exhaustion of petroleum resources.

Epoxidized natural rubber according to the present invention is a natural rubber modified with an epoxy group, the content of the epoxy group in the rubber is suitable 20 to 60 mol%. If the content of the epoxy group is less than 20 mol%, the adhesion improvement is not greatly improved, and if it exceeds 60 mol%, cold resistance tends to be lowered, which is not preferable.

In addition, the rubber composition of the present invention is characterized in that the content of the non-petroleum raw material in the total rubber composition is 60 to 95 parts by weight.

In the conventional rubber composition for innerliner, synthetic rubber is used as a component of the raw material rubber, and carbon black and aromatic oil are used as the reinforcing material, so that the content of the petroleum-based raw material in the total rubber composition exceeds 60 parts by weight.

However, in the present invention, by replacing the content occupied by the petroleum-based raw materials with non-petroleum-based raw materials, it is environmentally friendly and can solve the problems caused by petroleum depletion.

Non-petroleum raw materials included in the rubber composition of the present invention are silica and natural oils.

The silica has a BET surface area of 140 to 260 m 2 / g, preferably 50 to 70 parts by weight based on 100 parts by weight of the raw material rubber. When the BET surface area of the silica is less than 140 m 2 / g, there is a problem of poor reinforcement, and when the BET surface area is more than 260 m 2 / g, there is a problem that the physical properties are lowered because the dispersibility is lowered and aggregates, which is not preferable.

In addition, one of the non-petroleum raw material in the rubber composition of the present invention is a natural oil, the natural oil may be included in 5 to 25 parts by weight, preferably 7 to 9 parts by weight with respect to 100 parts by weight of the raw rubber.

Although it is preferable to replace the entire amount of the aromatic oil conventionally used with natural oil, in terms of physical properties, it is preferable to replace with 5 to 25 parts by weight based on 100 parts by weight of raw rubber, and if less than 25 parts by weight of petroleum resources The effect of suppressing use cannot be obtained.

The natural oils preferably include at least one selected from the group consisting of vegetable oils, semi-dry oils having an oxo of 100 to 130, and undry oils having an oxo of 100 or less. In this case, the oxo value means the number of grams of iodine absorbed by 100 g of oil or fat.

The plant fat and oil preferably comprises at least one selected from the group consisting of palm oil, grape seed oil, jojoba oil, camellia oil, castor oil, soybean oil, and sunflower seed oil.

The tire inner liner rubber composition may further include an aromatic oil within 10 parts by weight based on 100 parts by weight of the raw rubber in addition to the natural oil. Any of the aromatic oils can be used as long as they are conventionally used for tire inner liners.

In addition, a silane coupling agent is required to react with the silica. The silane coupling agent is preferably selected from bis (triethoxysilylpropyl) disulfide (bisPD) and bis (triethoxysilylpropyl) tetrasulfide (bis (triethoxysilylpropyl) tetrasulfide (TESPT).

The silane coupling agent preferably contains 2 to 22 parts by weight based on 100 parts by weight of epoxidized natural rubber, and when the content of the silane coupling agent is less than 2 parts by weight, a reaction effect with the silica may not be obtained, and it is more than 22 parts by weight. In this case, the coupling agent may remain in the rubber composition after the coupling, thereby deteriorating the physical properties of the tire.

In addition to the above composition, as other additives such as zinc oxide, stearic acid, sulfur, vulcanization accelerators, and other known innerliner rubber additives, each of these is sufficient to be appropriately selected and carried out according to a range of known amounts. The description is omitted.

Hereinafter, the present invention will be described in more detail with reference to Examples. The embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, and the following examples can be modified in various other forms, and the scope of the present invention is It is not limited to an Example. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept to those skilled in the art.

Comparative Examples 1 to 5 and Examples 1 to 2

To prepare a rubber composition according to each comparative example and Example with the composition shown in Table 1.

(Content: parts by weight) Comparative Example Example One 2 3 4 5 One 2 Raw rubber Butyl rubber 100 - - - - - - Natural Rubber (NR) - 100 - - - - - Epoxidized Natural Rubber - - 100 100 100 100 100 reinforcement Carbon black 50 50 50 - - - - Silica - - - 50 50 50 50 Silane
Coupling agent TESPD - - - 7.5 - 7.5 7.5 TESPT - - - - 7.5 - 7.5 oil Aromatic oils
(N # 2 oil) 10 10 10 10 10 2 2 Natural Oil (Sunflower Oil) - - - - - 8 8 Zinc oxide 3 3 3 3 3 3 3 Stearic acid 2 2 2 2 2 2 2 Vulcanization accelerator 2 2 2 2 2 2 2 brimstone 1.8 1.8 1.8 1.8 1.8 1.8 1.8

(Unit: parts by weight)

The evaluation results of the rubber specimens prepared in Comparative Examples and Examples are shown in Table 2, and the measurement was performed according to the following method.

(1) Mooney viscosity (ML1 + 4, 125 ° C): Measured using a Mooney MV2000 (Alpha Technology) apparatus at a large rotor, preheating for 1 minute, rotor operating time of 4 minutes,

(2) Tensile properties: The hardness was measured using a Shore A hardness tester and the tensile properties were measured using an Instron tester according to ASTM D412.

(3) Gas permeability: The unit of gas permeability is (cc · mm / ㎡ · atm · day) × 10 ⁶ .

Physical property (unit: index) Comparative Example Example One 2 3 4 5 One 2 Hardness 50 54 58 67 70 70 68 Tensile strength (kgf / cm2) 101 102 101 110 115 137 108 Elongation (%) 612 470 422 398 412 437 375 Gas permeability 428 578 684 345 367 380 324 Adhesion 39 45 47 52 56 61 65

As shown in Table 2, Comparative Example 1 using butyl rubber as the raw material rubber has a problem that can not be applied to the inner liner because the gas permeability required for the tire inner liner rubber composition is low.

In addition, in the case of Examples 1 to 2, while applying non-petroleum-based raw materials, it can be seen that the hardness, tensile strength and elongation rate are superior to Comparative Examples 1 to 5, and the air resistance and adhesion are greatly improved.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of right.

Claims

100 parts by weight of raw material rubber containing epoxidized natural rubber having an epoxy group content of 20 to 60 mol%,
60 to 95 parts by weight of non-petroleum raw materials including silica and natural oils,
2 to 22 parts by weight of the silane coupling agent, and
Contains less than 10 parts by weight of aromatic oil,
The silica is included in 50 to 70 parts by weight based on 100 parts by weight of the raw material rubber,
The natural oil is a rubber composition for a tire inner liner is contained in 5 to 25 parts by weight based on 100 parts by weight of the raw rubber.

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The rubber composition for tire innerliner according to claim 1, wherein the silica has a BET surface area of 140 to 260 m 2 / g.

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The rubber composition for a tire inner liner according to claim 1, wherein the natural oil comprises at least one selected from the group consisting of vegetable oil, semi-dry oil having an oxo value of 100 to 130, and undry oil having an oxo value of 100 or less. .

The rubber composition for a tire inner liner according to claim 5, wherein the plant oil and fat contains at least one selected from the group consisting of palm oil, grape seed oil, jojoba oil, camellia oil, castor oil, soybean oil, and sunflower seed oil.

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The rubber composition for tire innerliner according to claim 1, wherein the silane coupling agent is selected from bis (triethoxysilylpropyl) disulfide (TESPD) and bis (triethoxysilylpropyl) tetrasulfide (TESPT). .

A tire innerliner manufactured using the rubber composition for tire innerliner according to any one of claims 1, 3, 5, 6, and 8.