Functional SSBR (solution polymerized styrene-butadiene rubber) in silane coupling agent modification chain and synthesis method of functional SSBR

Abstract

The invention discloses functional SSBR (solution polymerized styrene-butadiene rubber) in a silane coupling agent modification chain and a synthesis method of the functional SSBR. The method comprises steps as follows: under argon protection, butadiene and styrene are added to a hydrocarbon solvent, and organolithium is added to remove impurities and taken as an initiator; a structure modifier isadded for random copolymerization of butadiene and styrene; when conversion rate of a copolymerization is close to 100%, organolithium is added to a hydrocarbon solution of unterminated activated SSBR for a reaction, and a rubber solution is obtained; a silane coupling agent is added to the rubber solution for a reaction, an antioxidant is added through termination, discharging is performed, therubber solution is subjected to wet agglomeration and dried, and the functional SSBR in the branched chain is obtained. The functional SSBR and the synthesis method have beneficial effects as follows:processability of the SSBR can be improved greatly, compatibility of the SSBR and white carbon black is improved, and functional groups are distributed in the polymer chain more uniformly.

Description

technical field [0001] The invention belongs to the technical field of synthesis of solution-polymerized styrene-butadiene rubber, and relates to functionalized solution-polymerized styrene-butadiene rubber in a chain modified by a silane coupling agent and a synthesis method thereof. Background technique [0002] As a tire tread rubber, solution polystyrene butadiene rubber has good wet skid resistance, excellent wear resistance and low rolling resistance. Branched functionalized solution polystyrene butadiene rubber (SSBR) is a synthetic part with It is a mixed rubber with large molecular weight styrene-butadiene rubber linear main chain structure and small molecular linear branch structure. Because of its unique branched structure, and the functional groups contained in the branched structure can improve its affinity with carbon black or silica, thereby improving the processing performance of solution-polymerized styrene-butadiene rubber. [0003] At present, the solutio...

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Problems solved by technology

However, its functional group content is very limited, so it cannot solve the problem of dispersion of active fillers in rubber well, thus affecting its reinforcing effect

[0007] CN104017133A (publication date: 2014.04.18) discloses a synthesis of multifunctional solution-polymerized styrene-butadiene rubber in nitrogen-containing chain end chains and a preparation method thereof. In the process of copolymerization of styrene-butadiene, a nitrogen-containing third monomer is introduced to synthesize Multifunctional solution polymerization of styrene-butadiene rubber in the nitrogen-containing chain end chain, this method overcomes the disadvantage of only chain end modification in the traditional solution polymerization of styrene-butadiene rubber, but needs to add a third monomer during the polymerization process, and the functional group restricted to nitrogen-containing groups

However, in the synthesis of this method, 1,1-diphenylethylene derivatives containing siloxane group monomers need to be introduced, and the production cost is relatively high

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