Double-end-functionalized ternary copolymer rubber and preparation method thereof

Abstract

The invention provides ternary copolymer rubber with both double ends of a macromolecular chain being functionally modified. In the invention, a functionalization initiator and an end terminating method are employed so that different functional groups are formed on two ends of the molecular chain and meanwhile the two ends of the molecular chain have excellent binding force with carbon black / white carbon black. On one end, an organic lithium initiator having a protecting group is employed to enable the molecular chain to contain a [-Si-(OR)3] group, which is beneficial to nano dispersion of a filler in a rubber substrate; and on the other end, a carboxylic group is included so that interaction with carbon black is promoted, thereby promoting dispersion of the carbon black in the rubber substrate. Meanwhile, the two ends of the macromolecular chain act on the carbon black / white carbon black to reduce the freedom degree of a chain section between a final crosslinked point and a chain terminal in the rubber network, so that the macromolecular chain effectively participates in elastic recovery of the whole crosslinked network, thereby reducing energy loss during periodic deformation and improving heat generation and rolling resistance. The double-end-functionalized ternary copolymer rubber has low rolling resistance and high anti-moisture sliding performance, so that the rubber is an excellent high-performance tyre rubber.

Description

technical field [0001] The invention belongs to the technical field of synthetic rubber, and relates to a double-terminal functionalized ternary copolymer rubber and a synthesis method thereof, thereby obtaining a novel ternary copolymer rubber with excellent comprehensive performance, especially high wet skid resistance and low rolling resistance. Background technique [0002] With the technological progress of the automobile and tire industry, the performance requirements of synthetic rubber are getting higher and higher. Tire tread rubber should not only have low rolling resistance and good wet skid resistance, but also have excellent wear resistance, etc. . Solution-polymerized styrene-butadiene rubber (SSBR) has gradually become one of the preferred rubbers for high-performance tire treads due to its good balance of low rolling resistance and high wet skid resistance. Terpolymerized rubber (SIBR) is a new generation of polystyrene butadiene rubber. Its design concept i...

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Problems solved by technology

However, multifunctional initiators have problems such as unstable storage and high system viscosity when initiating polymerization, resulting in a low degree of functionalization of siloxane groups. When preparing high-molecular-weight rubber materials, the degree of functionalization is only 40-60%. , the most important thing is to bring an excessive amount of functionalized end-capping agent and hydrogen chloride generated by the reaction into the polymerization system, which brings great difficulties for solvent refining and recycling, and limits its application in industrial production

[0006] From the existing report technology, there are mainly the following deficiencies: (1) some functional groups can only partially modify one end of the macromolecular chain, and usually only interact with carbon black or white carbon black, but cannot simultaneously improve the interaction with carbon black, Compatibility of white carbon black; (2) functionalized initiators are unstable and usually have relatively poor solubility in hydrocarbon solvents of the type usually used for anionic polymerization; (3) functionalized initiators are used for polymerization During the process, the viscosity of the system is too high to maintain the growth of the active end, which negatively affects the polymerization rate and efficiency; (4) the degree of functionalization of the alkoxy groups prepared by the end-capping agent method is not high, and the dispersion effect of rubber and silica is not improved. Obviously; (5) It is mainly used for the modification of butadiene and styrene copolymerization, but there are few reports for the modification of butadiene, styrene and isoprene copolymerization

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