KR960002294B1 - Rubber composition of tire tread using special coupling agent - Google Patents

Abstract

n,n'-bis(2-methyl, 1,2-nitropropyl)-1,6-diaminohexane, as carbon black-rubber coupling agent, which is of below 4phr; carbon black having 60-150 mg/g of N SA value and 100-140 ml/100g of DBP value which is using of below 40-70 phr. The rubber is used with natural rubber of 100 phr, or natural rubber of above 40 phr and SBR or BR of below 60 phr. The obtd. tire tread has a improved abrasion resistance, a heating resistance, a controlling stability and a lower fuel property.

Description

[Name of invention]

Rubber composition of tire tread with special coupling agent

Detailed description of the invention

The present invention relates to tire tread rubber as N, N'-bis (2-methyl-2-nitropropyl) -1.6 diaminohexane (N, N'-bis (2-methyl-2nitropropyl)-as a carbon black-rubber coupling agent. 1, 6-diaminohexane (hereinafter referred to as Sumifine 1162) relates to a tread rubber composition characterized by having a tread wear resistance, exothermic resistance, improved steering stability and low fuel consumption.

In general, a large amount of carbon black should be used to improve the wear performance of the tread rubber.However, in the case of heavy use, the temperature inside the tire rises during driving, causing separation, which may cause the risk of accidents and recap. As it is a fuel-saving tread rubber, the modulus increases when using a special carbon black with large structure, which can cause cracks on the surface of the tread rubber while driving. In order to improve the traction (Traction), which is the main factor of the stability of adjustment, styrene butadiene copolymer rubber (SBR) should be used.In this case, the tire temperature rises while driving to reduce the durability of the tire. Increasing tire manufacturing costs when using solution polymerized S-SBR, a special polymer W may be the cause of rising prices.

The present invention aims to provide a tread rubber composition of a tire in which fuel is saved while improving the wear resistance, heat resistance, adjustment stability, and the like by solving the above problems.

The present invention uses only 100 phr of natural rubber (parts per hundred rubber) as the raw material rubber, or more than 40 phr of natural rubber and less than 60 phr of SBR, polybutadiene rubber, and carbon black (C / B) used as a rubber reinforcement is N 60-150 mg / g SA (specific surface area measured by nitrogen adsorption) and 100-140 ml / 100 g of DBPA (Dibutyl Phthalate Absorption) using 30-70 phr, and the C / B-rubber coupling agent As a composition of a tire tread rubber characterized by adding up to 3 phr of Sumifine 1162.

In particular, the addition of the coupling agent improves the dispersibility of the rubber matrix of C / B, and reduces the heat generation of the tread rubber by minimizing energy loss when running tires at the interface between C / B-rubber, thereby improving durability. Increasingly, the C / B of the vehicle can be used for the tread rubber, which significantly improves the wear resistance. In addition, the wet traction is increased to improve the steering stability of the vehicle while minimizing the energy loss while driving the tire, it is characterized by the effect of saving fuel while driving.

The rubber-C / B coupling agent used in the present invention is most effective when used in natural rubber, but also effective in mixing natural rubber and SBR and mixing natural rubber and polybutadiene (BR), but using SBR and polybutadiene alone (100 phr). Or, when the use degree of SBR, BR is more than 60phr, the effect was slight. In addition, even when the C / B-rubber coupling agent is used more than 4phr, the effect was slight.

EXAMPLE

[Lab test]

As raw material rubber, natural rubber, SBR, BR rubber were used, and C / B used six types of C / B such as N110, N220, N234, N330, N351, N375, and the amount of C / B-rubber coupling agent Used. Table 1 shows the blending ratios for the laboratory tests and their performance.

TABLE 1

[Test Methods]

[Fever characteristic]

A goodrich flexometer was used to measure the difference between the initial and final temperatures of the specimen while applying a load. At this time, the reference compound "A" was calculated as 100 and compared (the larger the value, the better the performance).

[Wear resistance]

BP Goodrich's pico wear tester was used to measure the difference in weight after the test, and the standard compound "A" was calculated as 100 and compared. )

[Viscoelasticity (Tan δ)]

Toyo Baldwin's Dynamic Viscoelastometer model, DDV-IIIC, 0 ° C showing wet grip substitution characteristics while changing temperature, 60 rotation resistance Tan δ was measured at 0 ° C. (The higher the value of Tan δ at 0 ° C, the better the friction. The lower the value of Tan δ at 60 ° C, the better the rolling resistance and the lower fuel consumption.)

Claims (2)

In the tread rubber composition of a tire, the carbon black-rubber coupling agent is N, N'-bis (2-methyl, 1,2-nitropropyl) -1, 6-diaminohexane of 4 phr or less and carbon black The composition of the rubber for tire treads, characterized in that the N SA value is 60-150 mg / g, and the DBP value is 100-140 ml / 100 g, using 40-70 PhR. The composition as claimed in claim 1, wherein the rubber is 100 PHR or more of natural rubber and 40 PHR or more of rubber and 60 PHR or less of SBR or BR rubber.