KR100971728B1 - Rubber Composition For Passenger Car Carcass Including BCDD - Google Patents

Abstract

In the carcass rubber composition for automobiles, 40 to 60 parts by weight of carbon black and 2,3-bis (phenylamino) cyclohexa-2,5-diene-1 represented by the following Chemical Formula 1 with respect to 100 parts by weight of the raw material rubber A carcass rubber composition for automobiles comprising a reinforcing agent composed of a blend of 2 to 4 parts by weight of, 4-dione (2,3-bis (phenylamino) cyclohexa-2,5-diene-1,4-dione, BCDD). .

...화학식(1)

... Formula (1)

The present invention also relates to a rubber made of the rubber composition and a tire made of the rubber composition.

Carcass rubber composition, carbon black, BCDD

Description

Rubber composition For Passenger Car Carcass Including BCDD}

In the carcass rubber composition for automobiles, 40 to 60 parts by weight of carbon black and 2,3-bis (phenylamino) cyclohexa-2,5-diene-1,4-dione based on 100 parts by weight of the raw material rubber (2,3-bis (phenylamino) cyclohexa-2,5-diene-1,4-dione, BCDD) A carcass rubber composition for automobiles comprising a reinforcing agent composed of a blend of 2 to 4 parts by weight.

Tires are molded from rubber consisting of a composition containing various additive components. Since tires support the load of a vehicle and are a means by which a vehicle moves, various characteristics are calculated | required. For example, in order for a vehicle to stop while moving, the braking force must be good, and most tires must have good abrasion resistance and / or durability because wear occurs when the vehicle is supported, moved, or stopped, and tire damage may occur due to aging of the rubber. Aging characteristics should also be good.

The present invention relates to a carcass rubber composition for automobiles, and more particularly, to a carcass rubber composition designed to improve durability in the running of a high load tire.

The above-mentioned carcass refers to a layer of cords that endure high-pressure air inside the tire and form an important part of the skeleton, which must support a load and withstand shock, and have a strong fatigue resistance to flexing movements while driving. The casing structure is composed of a composite material of fiber cord and rubber component. The codes commonly used for the carcass structure use polyester cords or rayon cords treated with resocinol formaldehyde resin (RFL). The resorcinol formaldehyde resin treated on the cord is used to improve the adhesion between the rubber compound and the cord, and a hydroxyl group (-OH) is present on the surface.

Typically, the rubber composition for carcass serves as a support for the adhesion to the fiber cord, the flexural aging performance and the tire can be supported from the load, reinforcing additives are used in the rubber composition to reinforce this role.

As in the vinyl structure disclosed in Korean Patent No. 1999-0026210, the composition ratio of rubber has been changed to improve reinforcement of a rubber composition for carcass. However, the adhesion between the vinyl structure and the double bond of the rubber may be somewhat improved, but there is a limit to improving the separation of the carcass turn-up part.

In order to improve the separation, it is indispensable to improve the adhesive force of the rubber used in the tire, but in particular, the carcass, which constitutes the tire body, is used for rubber-to-metal adhesion, rubber-rubber adhesion, and rubber-rubber adhesion. At the same time, there are many limitations in the process due to the difficulty of holding and especially the nature of the overuse of organic chemicals.

In addition, the carcass compounding rubber should not only use relatively small amounts of reinforcing agents, adhesive aids, anti-aging agents and sulfur, but also a small amount of oil. Therefore, it is difficult to avoid an increase in the thermal history during the rolling process and to control the pattern viscosity. It is very difficult to maintain adhesion.

The present invention provides 2,3-bis (phenylamino) cyclohexa-2,5-diene-1,4-dione (2,3-bis (phenylamino) cyclohexa-2,5-diene-1,4-dione, BCDD It is intended to provide a carcass rubber composition for automobiles including).

In the carcass rubber composition for automobiles, 40 to 60 parts by weight of carbon black and 2,3-bis (phenylamino) cyclohexa-2,5-diene-1,4-dione based on 100 parts by weight of the raw material rubber It is an object of the present invention to provide a carcass rubber composition comprising a reinforcing agent composed of a blend of (2,3-bis (phenylamino) cyclohexa-2,5-diene-1,4-dione, BCDD) 2 to 4 parts by weight.

Automotive carcass rubber composition of the present invention has the effect of improving the adhesive force between the rubber and the fiber cord.

The tire manufactured using the carcass rubber composition for automobiles of the present invention has an effect of excellent durability even under high loads.

The present invention provides 2,3-bis (phenylamino) cyclohexa-2,5-diene-1,4-dione (2,3-bis (phenylamino) cyclohexa-2,5-diene-1,4-dione, BCDD An automobile carcass rubber composition comprising

The present invention relates to a carcass rubber composition for automobiles comprising a reinforcing agent composed of a blend of 40 to 60 parts by weight of carbon black and 2 to 4 parts by weight of BCDD based on 100 parts by weight of the raw material rubber.

As the chemicals are added to the rubbers, the rubbers have properties that suit the purpose of use. The chemicals used are called rubber compounding agents. There are various kinds of compounding agents such as reinforcing agents, vulcanizing agents, vulcanization accelerators, vulcanization retardants, anti-aging agents and tackifiers. Among them, the present invention produced an excellent rubber composition using a reinforcing agent including carbon black and BCDD having a particularly important function.

 Even if the above reinforcing agent is put into natural rubber, since the original rubber itself has high strength, there is little change in the strength thereof, but the wear resistance is greatly improved. On the other hand, when the reinforcing agent is added to synthetic rubber, the strength may be increased up to 10 times.

Carbon black used in the present invention was used as a component of this reinforcing agent. The carbon black is fine particles made by incomplete combustion or pyrolysis of natural gas or mineral oil. The main component is carbon.

Looking at the structure of BCDD (2,3-bis (phenylamino) cyclohexa-2,5-diene-1,4-dione) of Formula 1 below, an amine is bound to benzoquinone, and the amine is phenyl. The groups are combined. Benzoquinone is located in the downward direction of the amine, thereby increasing the activity of the amine. The phenyl group functions to chemically bond the rubber double bonds, and the non-covalent electron pairs of the amine function well to hydrogen bond the rubber, thus improving the adhesion between the rubber composition including BCDD and the fiber cord. Play a role.

[Formula 1]

In addition, the phenyl group of BCDD acts to stabilize the double bond of the amine and the rubber, which can significantly improve the separation occurring at the turn-up site of the carcass rubber composition. The above-mentioned separation means deterioration of the rubber or fiber cord or deterioration of adhesive force that may occur when the tire generates heat of about 125 ° C. or more, which is a temperature of a general belt that can withstand heat. This separation is caused by various causes, such as air pressure, load, and driving time of the vehicle. The cause of the separation will be described below.

When the air pressure of the tire is insufficient, the bending motion of the tire becomes excessively large, and the restoring force to return by the bending increases. As a result, the tire cord may be scattered due to fatigue of rubber or tire cord constituting the tire and a decrease in adhesive force. On the contrary, if the tire pressure is too high, the carcass inside the tire is extremely tense, which may weaken the trauma or impact and cause separation.

Increasing the load increases the amount of deformation of the tire and increases the internal temperature. In the case of overloading, in general, high air pressure is often filled, so that a strong stress is generated on the shoulder portion and the bead portion of the tire, which causes abnormal heat generation, and easily causes separation or overheating of the shoulder portion and the bead portion. In addition, it is easy to cause a penetration image on the tread portion, and a tear due to impact is also likely to occur, which may cause separation.

As the driving speed of the car increases, the tire flexion movement during driving increases and the amount of heat generated in the tire increases. In addition to the static load, the inertia force due to acceleration is applied as the load applied to the tire by the up and down vibration received from the road surface while the vehicle is traveling. In this way, all the loads applied during driving are called dynamic loads. As the speed of the vehicle increases, the impact and acceleration received from the unevenness of the road surface also increase, and the dynamic magnification (increase of dynamic load against static load) increases. Therefore, the bending motion of the tire is larger, and of course, the temperature inside the tire is high, which may cause separation.

The tire is heated by repeated bending movements while driving. If the tire continues to run for a long time at high temperature, the rubber, tire cord, etc. constituting the tire may age and the adhesive force may be degraded, causing separation.

  As such, BCDD is used in the present invention to significantly improve the separation that may be caused by various causes.

The anti-aging agent is an organic compound used to extend the life of the product mainly by preventing the rubber cracks caused by oxidation as a kind of component added in the production of rubber products including tires.

The anti-aging agent is of various kinds depending on the causes of aging, such as oxygen, ozone, heat, ultraviolet rays, moisture. Normally, anti-aging means that can protect rubber from oxidation and heat, and ozone anti-aging agent is used to prevent surface cracking caused by ozone when the rubber product is exposed to ozone-containing air in the stretched state. do. Such anti-aging agents may use one type of anti-aging agent when used in rubber products, but in general, two or more types of anti-aging agents are selected and used to improve the life of rubber products due to various aging causes.

The raw material rubber may be used only natural rubber or a mixture of natural rubber and styrene-butadiene in a weight ratio of 4: 1.

Said styrene butadiene is a synthetic rubber which hybridized styrene and butadiene in the ratio of about 1 to 3, and has the characteristic which is excellent in elasticity, heat resistance, and aging resistance.

Moreover, this invention shows the rubber | gum which consists of said rubber composition.

Moreover, this invention shows the tire containing the rubber | gum which consists of said rubber composition.

Hereinafter, the content of the present invention will be described in more detail with reference to Examples and Comparative Examples. However, these examples are only presented to understand the contents of the present invention, the scope of the present invention is not limited to these examples.

<Examples>

100 parts by weight of natural rubber composed of 80 parts by weight of natural rubber, 20 parts by weight of styrene-butadiene rubber, 50 parts by weight of carbon black N660, 2.0 parts by weight of hexamethylmelamine (HMMM), 2,3-bis (phenylamino) cyclohexa-2 , 5-diene-1,4-dione (BCDD) 2.5 parts by weight and other active agents, preservatives, vulcanizing agents are blended as shown in the following [Table 1] and vulcanized at 160 ℃ temperature for 25 minutes to prepare a rubber composition for carcass Prepared. Sulfur was used here as a component of the vulcanizing agent.

Comparative Example

In order to compare the effect of adding BCDD to the rubber composition in the above embodiment, the rubber composition was prepared in the comparative example except for BCDD.

That is, 100 parts by weight of raw material rubber composed of 80 parts by weight of natural rubber, 20 parts by weight of styrene-butadiene rubber, 50 parts by weight of carbon black N660, 2.0 parts by weight of hexamethylmelamine (HMMM), and other active agents, preservatives, and vulcanizing agents. It mix | blends as following [Table 1], and it was vulcanized at 160 degreeC for 25 minutes, and manufactured the rubber composition for carcass.

[Table 1] Compounding ratio of rubber composition for carcass (unit: parts by weight)

Item Example Comparative example Natural rubber 80 80 Styrene Butadiene Rubber 20 20 Carbon black 50 50 HMMM 2.0 2.0 BCDD 2.5 - Zinc oxide 5 5 Stearic acid 2.5 2.5 Process oil 5 5 accelerant 0.6 0.6 DPG 0.3 0.3 brimstone 4 4 Anti-aging 3 3

Experimental Example 1

Rubber samples were prepared using the rubber compositions prepared according to the above examples and comparative examples, and experiments were conducted to check physical properties. That is, the experiment was performed by dividing the items of hardness, 100 ° C pattern viscosity, tensile strength, and adhesion / adhesive force.

Hardness was measured by a shore a method. Shore hardness test is a method of measuring the hardness of the sample by the height of the hammer protruding from the test surface of the specimen at a certain height.

100 ° C. pattern viscosity was measured using a Mooney tester.

Tensile strength was measured using an Instron tester.

Adhesion / adhesion was measured using H-Test. The H-Test described above was evaluated by vulcanization at 175 ° C. for 15 minutes using the ASTM method (1500D / 2P PET Cord).

The experimental results are shown in the following [Table 2].

[Table 2] Properties of Rubber Specimen

Action Items Example Comparative example
Rubber Specimen Hardness 62 60 100 ℃ 44 42 The tensile strength 185 175 Adhesion / Adhesion 23/100% 17/100%

As shown in Table 2, the rubber specimens of the examples prepared according to the present invention showed superior effects in terms of hardness, 100 ° C pattern viscosity, tensile strength, and adhesion / adhesive force than the rubber specimens of the comparative examples. This difference is due to the use of the BCDD component in the rubber composition of the present invention.

Experimental Example 2

Using the rubber produced in the above Examples and Comparative Examples to produce a finished tire was tested for durability. The results are shown in the following [Table 3] by measuring the running time until an accident that occurs on average under normal load and 130% load.

[Table 3] Durability of finished tire

Action Items Example Comparative example Condition
Finished product tires
(ECC-R54) Average travel time 76 hours 72 hours General load Average accident type Bead bursts Bead bursts General load Average travel time 68 hours 62 hours 130% load Average accident type Bead bursts Bead bursts 130% load

As shown in [Table 3], it can be seen that the finished tire manufactured using the rubber of the above example is considerably superior in durability compared to the finished tire manufactured using the rubber of the comparative example.

That is, the bead bursts when the finished tire according to the embodiment travels for an average of 76 hours under normal load conditions, but the bead bursts when the finished tire according to the comparative example travels for an average of 72 hours. .

In addition, even when a load of 130% was applied, the finished tire according to the embodiment was able to travel longer than the finished tire according to the comparative example until the accident of bead popping occurred.

 As can be seen in Table 3 above, using the rubber composition of the present invention can significantly improve the durability of the tire.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and modified within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. It will be appreciated that it can be changed.

According to the present invention, 2,3-bis (phenylamino) cyclohexa-2,5-diene-1,4-dione (2,3-bis (phenylamino) cyclohexa-2,5-diene-1,4-dione, By manufacturing the carcass rubber composition for automobiles containing BCDD), the tire which was excellent in durability can be manufactured.

Claims (4)

In the carcass rubber composition for automobiles, 40 to 60 parts by weight of carbon black and 2,3-bis (phenylamino) cyclohexa-2,5-diene-1,4-dione (2,3-bis (phenylamino) ) cyclohexa-2,5-diene-1,4-dione, BCDD) Car carcass rubber composition comprising a reinforcing agent composed of a blend of 2 to 4 parts by weight. [Formula 1]

The carcass rubber composition of claim 1, wherein the raw material rubber is mixed with natural rubber or natural rubber with styrene-butadiene in a weight ratio of 4: 1. Rubber consisting of the rubber composition of claim 1. A tire comprising a rubber consisting of the rubber composition of claim 1.