KR-102962311-B1 - Styrene-butadiene rubber and Butadiene rubber mixed wetmasterbastch and Method for Preparing the Same

Abstract

The present invention relates to a wet masterbatch composition of mixed styrene-butadiene rubber and butadiene rubber and a method for manufacturing the same, wherein the wear resistance can be improved by including 20 to 200 parts by weight of an inorganic filler per 100 parts by weight of rubber containing solution-polymerized styrene-butadiene rubber and solution-polymerized butadiene rubber in a content ratio of 1:1 to 5:1.

Inventors

• 이홍대
• 윤주영
• 유혁
• 송윤주

Assignees

• 주식회사 엠엔비그린어스

Dates

Publication Date

20260508

Application Date

20201231

Claims (5)

1. Based on 100 parts by weight of rubber composed of solution-polymerized styrene-butadiene rubber containing 5% to 50% by weight of oil and solution-polymerized butadiene rubber containing 50% to 95% by weight of a cis-1,4 structure in a content ratio of 1:1 to 5:1 A wet masterbatch composition of mixed styrene butadiene rubber and butadiene rubber comprising 20 to 200 parts by weight of an inorganic filler, wherein silica surface-treated with 1% to 10% by weight of a silane having a functional group containing or not containing a sulfur atom in a single molecule relative to the total weight of silica having a specific surface area BET of 90 to 300 m²/g.
2. A styrene butadiene rubber and butadiene rubber mixed wet masterbatch composition according to claim 1, characterized in that the solution-polymerized styrene-butadiene rubber contains a styrene content of 5% to 50% by weight.
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5. (a) a step of preparing a mixture by mixing a solution polymerized styrene-butadiene rubber containing 5% to 50% by weight of oil and a solution polymerized butadiene rubber containing 50% to 95% by weight of a cis-1,4 structure into a rubber solution in a content ratio of 1:1 to 5:1, and silica surface-treated with 1 % to 10% by weight of a silane having a functional group containing or not containing a sulfur atom in a single molecule relative to the total weight of silica having a specific surface area BET of 90 to 300 m²/g as an inorganic filler; (b) A method for preparing an acrylic rubber wet masterbatch composition comprising the step of drying the above mixture.

Description

Styrene-butadiene rubber and butadiene rubber mixed wet masterbatch composition and method for preparing the same The present invention relates to a wet masterbatch composition of styrene butadiene rubber and butadiene rubber mixture and a method for manufacturing the same. The background technology related to the present disclosure is provided herein, and these do not necessarily constitute known technology. With the recent rise in prominence of eco-friendly vehicles such as electric cars, there is a growing demand for tires to reduce rolling resistance to ensure long driving ranges, while also requiring improved wear resistance to prevent wear caused by the high torque and battery loads generated by the electric power source during initial acceleration. Tires are also required to provide braking power capable of stopping the vehicle by utilizing friction with the road surface. Since braking power and rolling resistance in tires tend to be inversely related, a trade-off occurs where choosing one performance aspect results in a disadvantage for the other, and wear resistance is also affected by this. Accordingly, technologies to improve tire treads are continuously being developed to achieve high performance, and various technologies are being developed to effectively improve braking power, rolling resistance, and wear resistance on wet surfaces. Korean Registered Patent No. 2070987 describes a method of obtaining an SBR/BR-silica composite by adding hydrophobically modified nested silica, modified with polyetheramine, to a mixed solution of SBR and BR using a wet masterbatch method, and adding Si-69 and 2-ethylhexanoate zinc salt thereto. This prevents a deterioration in physical properties even when silica components are included instead of carbon black, but since the amount of BR used is limited, there is still a need for improvement in wear resistance. Accordingly, the inventors of the present invention, as a result of efforts to solve the above problem, confirmed that when a wet masterbatch composition of styrene butadiene rubber and butadiene rubber mixed, comprising 20 to 200 parts by weight of an inorganic filler to 100 parts by weight of rubber containing solution-polymerized styrene-butadiene rubber and solution-polymerized butadiene rubber in a content ratio of 1:1 to 5:1, is applied to a tire, the wear resistance is improved, and thus the present invention was completed. Before describing the present invention in detail below, it should be understood that the terms used in this specification are intended only to describe specific embodiments and are not intended to limit the scope of the invention, which is limited solely by the appended claims. Furthermore, terms and words used in this specification and claims shall not be interpreted as being limited to their ordinary or dictionary meanings, but shall be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor may appropriately define the concept of a term to best describe their invention. However, unless otherwise stated, all technical and scientific terms used in this specification shall have the same meaning as generally understood by those skilled in the art. Throughout this specification and claims, unless otherwise noted, the terms "comprise," "comprising," and "comprising" mean including the mentioned article, step, or group of articles and steps, and are not used to mean excluding any other article, step, or group of articles or groups of steps. Meanwhile, various embodiments of the present invention may be combined with any other embodiments unless explicitly stated otherwise. Any feature indicated as particularly desirable or advantageous may be combined with any other features and features indicated as desirable or advantageous. A preferred embodiment of the present invention is to provide a wet masterbatch composition of styrene butadiene rubber and butadiene rubber mixed, comprising solution-polymerized styrene-butadiene rubber, solution-polymerized butadiene rubber, and an inorganic filler. The above styrene-butadiene rubber and butadiene rubber mixed wet masterbatch composition comprises solution-polymerized styrene-butadiene rubber and butadiene rubber, and the vinyl structure content and styrene content of the styrene-butadiene rubber can be controlled by solution polymerization, and the molecular weight and physical properties can be controlled by inorganic fillers, etc., thereby increasing the bonding strength between the rubber and the inorganic filler. The above wet masterbatch composition of mixed styrene-butadiene rubber and butadiene rubber may contain solution-polymerized styrene-butadiene rubber and solution-polymerized butadiene rubber in a content ratio of 1:1 to 5:1, and preferably 2:1 to 4:1. By having the solution-polymerized butadiene rubber in a content ratio of 1:1 to 5:1 with the solution-polymerized styrene-butadiene rubber, wear res