Styrene-butadiene rubber compound and rubber composition for tire bead fillers comprising the same

Active Publication Date: 2020-04-30
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a rubber composition that can be used to manufacture tires using only synthetic rubber, without using natural rubber and phenol-based resin. This can be achieved by blending two styrene-butadiene rubbers with different styrene contents, which exhibits excellent thermal stability and adhesivity during processing. The resulting rubber composition has improved physical properties such as strength and stiffness.

Problems solved by technology

However, when the content of the clay is high in this way, the hardness of the rubber is enhanced, but rolling resistance performance of tires may be deteriorated due to increase of heat generated between the clay and the rubber, rubber blending characteristics may be degraded, and a tensile strength may be lowered.
Also, the clay commonly used in the art has a low reinforcing effect on a rubber composition due to a low oil adsorption quantity thereof.
Such a method has an advantage in that the stiffness and hardness of the rubber are improved, but it has also a drawback in that stiffness of the rubber may be degraded as stiffness of the resin is degraded at a high-temperature condition, that is, a driving condition after tires are mounted.
Such methods have an advantage in that the stiffness is somewhat improved, but they do not yield satisfactory results.
In particular, since a natural rubber is used in the rubber composition as disclosed in the patents, it is impossible to secure sufficient hardness of a finally manufactured bead filler due to low compatibility with a synthetic rubber added together with the natural rubber.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0082](1) Manufacture of First Styrene-Butadiene-Based Rubber

[0083]1.2 parts by weight of potassium rosinate and 1.5 parts by weight of potassium oleate, both of which served as the emulsifying agents, 0.05 parts by weight of dodecyl mercaptan, 0.5 parts by weight of cumene hydroperoxide, and 200 parts by weight of water were added to a reaction container, based on 100 parts by weight of the monomer including 12 parts by weight of 1,4-butadiene and 88 parts by weight of styrene, and the resulting mixture was subjected to emulsion polymerization at 10° C. to prepare first styrene-butadiene rubber latex. The reaction was terminated at a point of time when a conventional polymerization conversion rate reached 90%.

[0084]2 parts by weight of calcium chloride was added to 100 parts by weight (solid content) of the prepared first styrene-butadiene rubber latex, and the resulting mixture was warmed to 70° C., aged for 20 minutes, and then cooled to obtain a coagulum. Then, the coagulum was ...

example 2

[0092]A rubber compound specimen was manufactured in the same manner as in Example 1, except that a first styrene-butadiene rubber having an average particle diameter of 140 nm was manufactured and used.

example 3

[0093]A rubber compound specimen was manufactured in the same manner as in Example 1, except that a first styrene-butadiene rubber having an average particle diameter of 180 nm was manufactured and used.

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Abstract

The present invention relates to a styrene-butadiene rubber compound and a rubber composition for tire bead fillers including the same, and more particularly, to a styrene-butadiene rubber compound capable of improving stiffness and hardness even when styrene-butadiene rubbers having different styrene contents are used instead of a combination of a conventional natural rubber and a phenol-based resin, and a rubber composition for tire bead fillers including the same.

Description

TECHNICAL FIELD[0001]This application claims priority to and the benefit of Korean Patent Application No. 10-2016-0149391, filed on Nov. 10, 2016 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in their entirety.[0002]The present invention relates to a styrene-butadiene rubber compound having excellent stiffness and hardness, and a rubber composition for tire bead fillers including the same.BACKGROUND ART[0003]A tire bead filler rubber requires higher stiffness and hardness when compared to rubber compounds in other parts in order to support a load of a vehicle transferred to a rim when the rim is installed in a tire. Also, the high rubber stiffness is required to prevent bead unseating that may be caused during car driving.[0004]A method of increasing a content of an inorganic substance such as clay to enhance hardness and stiffness of a rubber is used to improve stiffness of a tire bead filler rubber. However, when the conten...

Claims

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Application Information

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IPC IPC(8): C08L9/06C08F212/08C08F236/10B60C1/00
CPCB60C2001/0058C08L2205/025B60C1/00C08F236/10C08L9/06C08F212/08B60C15/06C08F2/24C08K3/04C08K3/36C08L9/08C08L2205/02B60C15/0603C08F2500/17
InventorLEE, SE EUNKIM, BYOUNG YUNJO, IN SUNGLEE, JAE MINCHOI, WOO SEOK
OwnerLG CHEM LTD