Two-end functionalized ternary copolymer rubber and preparation method thereof

Abstract

The invention provides a ternary copolymer rubber with functionalized modification at both ends of the macromolecular chain, which uses a functional initiator and an end-capping method to make both ends of the molecular chain contain different functional groups and simultaneously combine with carbon black / silica Good binding force: one end adopts the organolithium initiator of the protective group to make the molecular chain contain [—Si‑(OR)3] group, which is helpful to realize the nano-dispersion of the filler in the rubber matrix; the other end contains (—COOH ) group, which is beneficial to interact with carbon black, thereby promoting the dispersion of carbon black in the rubber matrix. At the same time, due to the interaction between the two ends of the macromolecular chain and carbon black / silica, the degree of freedom of the chain link between the final cross-linking point and the chain end in the rubber network is reduced, so that it can effectively participate in the elastic recovery of the entire cross-linking network , reduce energy loss in periodic deformation, improve heat generation and rolling resistance. The double-end functionalized ternary copolymer rubber of the present invention is an ideal rubber for high-performance tires due to its low rolling resistance and high anti-wet skid resistance.

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...

AI Technical Summary

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

Images