KR20130112481A - Tread rubber composition for tire improved wear resistance - Google Patents

Abstract

PURPOSE: A tire tread rubber composition provides a tire with improved abrasion resistance and improves tire replacement period due to abrasion. CONSTITUTION: A tire tread rubber composition includes 1-10 parts by weight of a fatty acid amide represented by chemical formula 1: C_nH_(2n+1)CONHCH_2OH based on 100.0 parts by weight of raw rubber. In chemical formula 1, n is 6-18. The raw rubber is a mixed rubber formed of 5-95 parts by weight of a butadiene rubber and 5-95 parts by weight of natural rubber. The butadiene rubber is selected from a butadiene rubber manufactured by using a lithium catalyst, a butadiene rubber manufactured by using a neodymium catalyst, a butadiene rubber manufactured by using a lithium catalyst, or a butadiene rubber manufactured by using a neodymium catalyst.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a tire tread rubber composition having improved wear resistance,

The present invention relates to a tire tread rubber composition having improved wear resistance. More particularly, the present invention relates to a tire tread rubber composition comprising a rubber composition comprising, as essential components, 100 parts by weight of a raw rubber, And 10 to 10 parts by weight of a rubber composition comprising a rubber composition comprising a rubber composition having improved abrasion resistance.

C _n H _{2n +1} CONHCH ₂ OH ????? (1)

In the above formula (1), n is 6 to 18.

The abrasion resistance of the tire tread is determined by the properties of the tread surface layer in contact with the ground.

Heat generation inevitably accompanied by the friction between the tire and the road at the time of driving the vehicle on the road lowers the physical properties and abrasion characteristics of the tire and causes rapid wear of the tire.

In order to prevent the deterioration of the abrasion resistance of the tire, conventionally, a method of using an antioxidant having good heat resistance characteristics or a mixture of rubber with rubber, a method of using a crosslinking agent as a single sulfur A method of improving thermal stability by changing to a monosulfide bond has been performed.

Various rubber compositions have been developed to improve the abrasion resistance of tire treads.

Accordingly, in the present invention, in order to improve the abrasion resistance of tire tread, the tire tread rubber composition includes at least one butadiene rubber selected from among butadiene rubber prepared using lithium (Li) catalyst and butadiene prepared using neodymium (Nd) , A tire tread rubber composition containing a fatty acid amide, and a tire comprising a rubber composed of the rubber composition.

As a prior art related to the present invention, Korean Patent Laid-Open Publication No. 1999-0080527 discloses a case in which tires are torn or broken in existing mountainous areas and unpacked roads. In order to prevent such tires from being torn or damaged, a ruthenium complex ₃ · 3H ₂ O) was added to show the rubber composition for tire with improved in cut and chip performance.

Korean Patent Laid-Open No. 2002-0086695 discloses a process for preparing a polymer base comprising a natural rubber and a styrene-butadiene rubber, using an organic filler as an organic filler and adding sulfur, sulfenamide, guanidine and 1,6-bis (N, N'-dibenzylthiocarbamoyl (Separation, abrasion and cut / chip performance) caused by a rise in the vulcanized outer temperature during vulcanization using a crosslinking system comprising a dicyclopentadiene-dithio-hexane copolymer, And a rubber composition for a truck tire tread having an improvement effect.

However, since the technical features of the prior art are different from those of the present invention, the inventions have different configurations.

It is an object of the present invention to provide a tire tread rubber composition having improved wear resistance.

Another object of the present invention is to provide a tire comprising a rubber made of a tire tread rubber composition having improved abrasion resistance.

The present invention relates to a tire tread rubber composition, which comprises 1 to 10 parts by weight of a fatty acid amide having the following formula (1) based on 100 parts by weight of a raw rubber, And the like.

C _n H _{2n +1} CONHCH ₂ OH ????? (1)

In the above formula (1), n is 6 to 18.

According to the present invention, it is possible to provide a tire having improved wear resistance to a consumer, thereby increasing the time for consumers of the vehicle owner to replace the tire by abrasion, thereby providing a cost advantage in terms of tire replacement.

The present invention relates to a tire tread rubber composition.

The present invention relates to a tire tread rubber composition having improved wear resistance.

The present invention relates to a tire tread rubber composition which comprises 1 to 10 parts by weight of a fatty acid amide having the following formula (1) based on 100 parts by weight of a raw rubber, thereby improving the abrasion resistance of the tire tread rubber composition.

C _n H _{2n +1} CONHCH ₂ OH ????? (1)

In the above formula (1), n is 6 to 18.

The butadiene rubber prepared using a lithium (Li) catalyst may be used as the starting rubber.

The butadiene rubber prepared by using a neodymium (Nd) catalyst may be used as the starting rubber.

The raw rubber may be composed of at least one butadiene rubber and a natural rubber (NR) selected from among butadiene rubber prepared by using a lithium (Li) catalyst and butadiene rubber produced by using a neodymium (Nd) catalyst.

When the total content of the raw rubber is 100, 5 to 95 parts by weight of a butadiene rubber produced by using a lithium (Li) catalyst and 5 to 95 parts by weight of a natural rubber may be used.

When the total content of the raw rubber is 100, 5 to 95 parts by weight of at least one butadiene rubber selected from butadiene produced by using neodymium (Nd) catalyst and 5 to 95 parts by weight of natural rubber may be used as the raw rubber .

When the total content of the starting rubber is 100, 5 to 95 parts by weight of at least one butadiene rubber selected from among butadiene rubber prepared by using a lithium (Li) catalyst and butadiene produced by using a neodymium (Nd) And 5 to 95 parts by weight of natural rubber may be used.

When the butadiene rubber prepared by using a lithium (Li) catalyst and the butadiene rubber produced by using a neodymium (Nd) catalyst are simultaneously used as a raw rubber, a butadiene rubber and a neodymium (Nd) catalyst, mixed butadiene rubber mixed at a weight ratio of 1: 9 to 9: 1 may be used.

The butadiene rubber prepared by using lithium (Li) catalyst may be a butadiene rubber prepared by using a lithium catalyst when preparing butadiene rubber.

The butadiene rubber prepared by using the lithium (Li) catalyst may be a butadiene rubber prepared by using a lithium catalyst in the production of butadiene rubber (a sheath content of 32% and a vinyl content of 11%).

The butadiene rubber prepared by using the lithium (Li) catalyst is a butadiene rubber prepared by using the lithium catalyst described in Korean Patent Application No. 1987-0700277 (Rubber for tire tread and composition thereof) (sheath content 32%, vinyl 11%) can be used.

The butadiene rubber prepared by using the neodymium (Nd) catalyst may be a butadiene rubber (having a sheath content of 98% and a vinyl content of 0.5%) prepared using a neodymium catalyst in the conventional butadiene rubber production.

1 to 10 parts by weight of fatty acid amide of the following formula (1) may be used for 100 parts by weight of the starting rubber.

C _n H _{2n +1} CONHCH ₂ OH ????? (1)

In the above formula (1), n is 6 to 18.

When the rubber composition of the present invention is used in an amount of less than 1 part by weight or more than 10 parts by weight of the fatty acid amide of the formula (1) based on 100 parts by weight of the raw rubber, the rubber composition of the present invention may not be obtained. , The fatty acid amide of formula (1) is preferably used in an amount of 1 to 10 parts by weight based on 100 parts by weight of the starting rubber.

The tire tread rubber composition of the present invention can be used as a reinforcing agent in a conventional tire tread rubber composition in addition to the fatty acid amide of the formula (1).

The reinforcing agent may be used in an amount of 30 to 80 parts by weight based on 100 parts by weight of the raw rubber.

As the reinforcing agent, carbon black may be used.

The reinforcing agent may be silica.

The reinforcing agent may be a mixed component in which carbon black and silica are mixed.

The reinforcing agent may be a mixed component in which carbon black and silica are mixed in a weight ratio of 1: 9 to 9: 1.

In the above, carbon black having an iodine adsorption of 50 to 200 g / kg and a DBP adsorption of 50 to 200 ml / 100 g may be used.

In the above, carbon black having an iodine adsorption of 120 ± 5 g / kg and a DBP adsorption of 130 ± 5 ml / 100 g may be used.

The silica may have an iodine adsorption of 100 to 200 g / kg and a DBP adsorption of 100 to 200 ml / 100 g.

The silica may have an iodine adsorption of 150 5 g / kg and a DBP adsorption of 150 5 ml / 100 g.

When silica is used as a reinforcing agent in the present invention, a silica dispersant may be used for dispersibility of silica.

Examples of the above silica dispersant include bis- (3-triethoxysilylpropyl) -tetrasulfane, TESPT, bis- (3-ethoxysilylpropyl) - (3-ethoxysilylpropyl) disulfane, ESPD), N- [2- (vinylbenzylamino) -3-aminopropyltrimethoxysilane, N- An acid salt, and a zirconate salt represented by the formula (3) may be used.

...... 화학식(2)

(2)

......화학식(3)

(3)

The silica dispersant may be used in an amount of 3 to 8 parts by weight based on 100 parts by weight of the raw material rubber.

The tire tread rubber composition of the present invention may further comprise a functional component for improving the functionality of the tire tread rubber composition.

The functional ingredient may further include 1 to 10 parts by weight based on 100 parts by weight of the raw rubber.

In the above, starch can be used as the functional ingredient.

The starch may be at least one selected from corn starch, potato starch, sweet potato starch, tapioca starch, rice starch or wheat starch.

The starch may be at least one selected from the group consisting of corn starch, potato starch, sweet potato starch, tapioca starch, rice starch and wheat starch, wherein the starch has a surface area of ² to 100 m ² / g, Preferably 15 to 75 m ² / g, more preferably 30 to 50 m ² / g.

In the present invention, various additives such as an active agent, a process oil, an antioxidant, a vulcanizing agent and a vulcanization accelerator used in conventional tire rubber compositions, as well as the above-mentioned raw rubber, the fatty acid amide of formula (1) And can be used in a predetermined amount. However, these are general components used in conventional tire tread rubber compositions and are not essential constituents of the present invention, and therefore, detailed description thereof will be omitted.

In order to achieve the object of the present invention, the tire rubber composition of the present invention having improved abrasion resistance has been subjected to various conditions, and it is preferable to provide the tire rubber composition improved in abrasion resistance by the above-mentioned conditions.

The present invention includes a rubber composed of the above-mentioned rubber composition.

The present invention includes a tire containing a rubber composed of the above-mentioned rubber composition.

The present invention includes a tire containing a rubber composed of the above-mentioned rubber composition as a tread.

The present invention includes a tire containing a rubber composed of the above-mentioned rubber composition, wherein the tire is any one selected from the group of automobile tires, truck tires, bus tires, aircraft tires, and motorcycle tires .

Hereinafter, the present invention will be described by the following examples, comparative examples and test examples. However, the scope of the present invention is not limited by these embodiments.

≪ Example 1 >

50 parts by weight of a butadiene rubber (having a sheath content of 32% by weight and a vinyl content of 11%) prepared using a lithium catalyst, 20 parts by weight of a butadiene rubber (sheath content: 98%, vinyl content: 0.5%) prepared using a neodymium catalyst, 50 parts by weight of carbon black, 3 parts by weight of process oil and 5 parts by weight of polymerized 2,2,4-trimethyl-1,2-dihydroquinoline (TMDQ) were added to 100 parts by weight of raw rubber composed of 30 parts by weight of rubber 5 parts by weight of zinc oxide (ZnO), 2 parts by weight of stearic acid, and 5 parts by weight of fatty acid amide of formula (1) were mixed to obtain a rubber compound.

1.5 parts by weight of sulfur, 2 parts by weight of cyclohexyl benzothiazole sulfenamide (CZ) and 0.5 parts by weight of a vulcanization accelerator (DPG) were added to the above rubber compound and vulcanized at 160 DEG C for 25 minutes to prepare rubber specimens.

The carbon black used was one having an iodine adsorption of 120 ± 5 g / kg and a DBP adsorption of 130 ± 5 ml / 100 g.

The rubber composition of Example 1 is shown in Table 1 below.

C ₆ H ₁₃ CONHCH ₂ OH ????? (1)

<Example 2>

30 parts by weight of a butadiene rubber (having a sheath content of 32% by weight and a vinyl content of 11%) prepared using a lithium catalyst as a raw rubber and 20 parts by weight of a butadiene rubber (sheath content: 98%, vinyl content: 0.5%) prepared using a neodymium catalyst And 50 parts by weight of a natural rubber were used in place of 100 parts by weight of the raw rubber.

<Comparative Example>

Rubber specimens were prepared in the same manner as in Example 1 except that 100 parts by weight of natural rubber was used as the raw rubber.

Rubber compositions (units: parts by weight) of Examples 1 to 2 and Comparative Examples Item Comparative Example Example 1 Example 2 Natural rubber 100 30 50 Lithium butadiene rubber * - 50 30 Neodymium butadiene rubber * - 20 20 Carbon black 50 50 50 Process oil 3 3 3 Antioxidants (TMDQ) 5 5 5 Zinc oxide 5 5 5 Stearic acid 2 2 2 Fatty acid amide - 5 5 brimstone 1.5 1.5 1.5 Vulcanization accelerator 0.8 0.8 0.8

<Test Example>

The rubber specimens prepared in Examples 1 and 2 and the rubber specimens prepared in Comparative Examples were tested for viscosity, tensile strength, REBOUND, HBU (Heat Built Up), blow out, abrasion , And actual vehicle wear, and the results are shown in Table 2 below.

Properties of Examples 1 and 2 and Comparative Examples division Comparative Example Example 1 Example 2 Viscosity 100 ℃ 63 70 75 TENSILE
(Initial) HD'S 65 67 69 300% -M 155 150 145 T.S. 300 285 260 E.B. (%) 500 480 460 REBOUND Resilience (%) 40 48 52 H.B.U ΔT (° C.) 22 22 22 Blow-Out (100 ° C) Minute 7.6 16.7 19.9 Wear* (g) 3.05 2.87 2.67 Actual vehicle wear Wear Index (%) 100 112 125

1) Wear: Rain. F. The BFGoodrich abrasion tester was used to test the test piece while pressing the upper side of the rotating test piece. The value was obtained by the weight difference between the initial test piece weight and the test piece weight after the test. .

2) Wear of actual vehicle: Indicates the wear index. The higher the value, the better the abrasion resistance.

<Example 3>

50 parts by weight of silica, 5 parts by weight of a silica dispersing agent, 50 parts by weight of a rubber raw material composed of 50 parts by weight of butadiene rubber (sheath content: 32% by weight, vinyl content: 11% 3 parts by weight of process oil, 5 parts by weight of anti-aging agent (TMDQ), 5 parts by weight of zinc oxide (ZnO), 2 parts by weight of stearic acid, 3 parts by weight of fatty acid amide of formula (1) Parts by weight were blended to obtain a rubber compound.

1.5 parts by weight of sulfur, 2 parts by weight of a vulcanization accelerator (CZ) and 0.5 parts by weight of a vulcanization accelerator (DPG) were added to the rubber compound and vulcanized at 160 DEG C for 25 minutes to prepare rubber specimens.

The silica used herein was one having an iodine adsorption of 150 ± 5 g / kg and a DBP adsorption of 150 ± 5 ml / 100 g.

In the above, bis- (3-triethoxysilylpropyl) -tetrasulfane (TESPT) was used as the silica dispersant.

In the above, corn starch had a surface area of 50 ± 2 m ² / g as a BET measurement value.

C ₈ H ₁₇ CONHCH ₂ OH ????? (1)

<Example 4>

25 parts by weight of butadiene rubber (having a sheath content of 32% by weight and a vinyl content of 11%) prepared by using a lithium catalyst and 50 parts by weight of a natural rubber were mixed with 50 parts by weight of silica, 5 parts by weight of a silica dispersant, 3 parts by weight of process oil, 5 parts by weight of anti-aging agent (TMDQ), 5 parts by weight of zinc oxide (ZnO), 2 parts by weight of stearic acid, 3 parts by weight of fatty acid amide of formula (1) Parts by weight were blended to obtain a rubber compound.

1.5 parts by weight of sulfur, 2 parts by weight of a vulcanization accelerator (CZ) and 0.5 parts by weight of a vulcanization accelerator (DPG) were added to the rubber compound and vulcanized at 160 DEG C for 25 minutes to prepare rubber specimens.

The silica used herein was one having an iodine adsorption of 150 ± 5 g / kg and a DBP adsorption of 150 ± 5 ml / 100 g.

As the silica dispersant, a zirconate salt represented by the following formula (2) was used.

In the above, corn starch had a surface area of 50 ± 2 m ² / g as a BET measurement value.

C ₁₀ H ₂₁ CONHCH ₂ OH ????? (1)

...... 화학식(2)

(2)

<Example 5>

25 parts by weight of butadiene rubber (having a sheath content of 32% by weight and a vinyl content of 11%) prepared by using a lithium catalyst and 50 parts by weight of a natural rubber were mixed with 50 parts by weight of silica, 5 parts by weight of a silica dispersant, 3 parts by weight of process oil, 5 parts by weight of anti-aging agent (TMDQ), 5 parts by weight of zinc oxide (ZnO), 2 parts by weight of stearic acid, 3 parts by weight of fatty acid amide of formula (1) Parts by weight were blended to obtain a rubber compound.

1.5 parts by weight of sulfur, 2 parts by weight of a vulcanization accelerator (CZ) and 0.5 parts by weight of a vulcanization accelerator (DPG) were added to the rubber compound and vulcanized at 160 DEG C for 25 minutes to prepare rubber specimens.

The silica used herein was one having an iodine adsorption of 150 ± 5 g / kg and a DBP adsorption of 150 ± 5 ml / 100 g.

As the silica dispersant, a zirconate salt represented by the following formula (3) was used.

In the above, corn starch had a surface area of 50 ± 2 m ² / g as a BET measurement value.

C ₁₂ H ₂₃ CONHCH ₂ OH ????? (1)

......화학식(3)

(3)

According to the present invention, it is possible to provide a tire improved in wear resistance to a consumer, thereby increasing the time for consumers of the vehicle owner to replace the tire by wear, thereby providing a cost advantage in terms of tire replacement, Which can contribute to the development of the tire-related industry.

Claims (3)

In a tire tread rubber composition,
A tire tread rubber composition comprising 1 to 10 parts by weight of fatty acid amide of formula (1) based on 100 parts by weight of raw rubber.
C _n H _{2n +1} CONHCH ₂ OH ????? (1)
In the above formula (1), n is 6 to 18. The method of claim 1,
The raw material rubber is (1) butadiene rubber made using lithium (Li) catalyst, (2) butadiene rubber made using neodymium (Nd) catalyst or (3) made using lithium (Li) catalyst. A tire tread rubber composition comprising butadiene rubber and a mixed rubber composed of 5 to 95 parts by weight of at least one butadiene rubber selected from butadiene rubber prepared using a neodymium (Nd) catalyst and 5 to 95 parts by weight of natural rubber. A tire comprising a rubber comprising the rubber composition of claim 1 or 2.