Synthetic method of solution-polymerized styrene-butadiene rubber

Abstract

The invention discloses a synthetic method of solution-polymerized styrene-butadiene rubber. The synthetic method sequentially comprises the steps of (1) adding an inert hydrocarbon solvent, butadiene and an non-essential structure modifier required by reaction into a reactor, then adding an effective amount of organic lithium initiator, and performing polymerization on a section A in the presence of the initiator to ensure that the conversion rate of polymerization of the section A reaches 97-100%, wherein the adding weight ratio of butadiene to the total reaction monomers is 10-70%, preferably 10-60% and more preferably 20-50%; (2) adding butadiene, styrene and the structure modifier to perform polymerization on a section B, wherein the adding weight ratio of butadiene to a styrene monomer is 40:60 to 80:20, preferably 50:50 to 70:30; (3) adding a coupling agent to perform a coupling reaction when the conversion rate of the section B reaches 100%; (4) ending the reaction after the coupling reaction is finished.

Description

technical field [0001] The invention relates to a synthesis method of solution-polymerized styrene-butadiene rubber (SSBR), more specifically, relates to a synthesis method of solution-polymerized styrene-butadiene rubber with wide temperature range and high damping. Background technique [0002] According to literature reports, SSBR is a copolymer of butadiene and styrene, and its preparation process belongs to anionic living polymerization. It can not only adjust the microstructure within a certain range through the means of molecular structure design, but also adjust the proportion of monomers. Varieties with different performance characteristics, so as to meet the special requirements of the prepared products in terms of strength modulus, density, temperature adaptability, pressure adaptability, and damping performance in a wide frequency range. [0003] Document 1 (Elastomer 2009; 6:35-37) prepared SSBR / butyl rubber material by solution co-precipitation method, which im...

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Problems solved by technology

However, the temperature range in the high damping area is narrow, and the temperature range of the loss factor Tan 6 ≥ 0.3 is about -25-4°C, which affects the use of the product in the field of damping and shock absorption

[0004] Document 2 (Materials Engineering 2009; S1:192-195) used ethoxyethyl morpholine (EOEM) to prepare SSBR with high vinyl content, and the product loss factor Tan 6 can reach 0.9, but the temperature range of its high damping zone It is also narrow, and the temperature range of loss factor Tan 6≥0.3 is about -1-+23°C, which affects the use of the product in the field of damping and shock absorption

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