Solution polymerization method of rare earth isoprene rubber

Abstract

A solution polymerization method for rare earth isoprene rubber includes the following steps: (1) performing physical absorption and chemical treatment to a hexane solution and an isoprene monomer to obtain anhydrous oxygen-free hexane solvent and an anhydrous oxygen-free isoprene monomer; (2) uniformly dispersing the anhydrous oxygen-free isoprene monomer with one part of the anhydrous oxygen-free hexane, an activator, and a homogeneous-phase rare earth catalyst in an activation kettle, and performing an activating reaction to form an active material; (3) directly feeding the active material into a pre-polymerization kettle to perform an isoprene pre-polymerization reaction to form a pre-polymerization reaction material containing a non-reacted monomer and a polymer; (4) feeding the pre-polymerization reaction material and the other one part of the anhydrous oxygen-free hexane directly into a polymerization reaction system which is composed of, in a series manner, three double-helical belt continuous stirred tank reactors having self-power scraper boards to perform an isoprene polymerization reaction; and (5) when the polymerization reaction is finished, fully mixing a polymerization product with an anti-aging agent in a highly dispersing machine, introducing a rubber liquid carrier, and coating the surface of high-viscosity rubber liquid with the rubber liquid carrier, and feeding the rubber liquid into a rubber liquid storage tank for condensation.

Description

technical field [0001] The invention relates to a synthetic rubber solution polymerization technology, in particular to a rapid, high conversion rate and controllable rare earth isoprene rubber solution polymerization method. Background technique [0002] Isoprene rubber (cis-1,4-polyisoprene rubber, IR), whose full name is cis-1,4-polyisoprene rubber, is a synthetic rubber made of isoprene through solution polymerization. The chemical composition, three-dimensional structure and physical and mechanical properties similar to natural rubber, also known as synthetic natural rubber, can be used alone or in combination with natural rubber or other synthetic rubber. It is an ideal material to replace natural rubber in the manufacture of radial truck tires, light truck radial tires, passenger car tires, etc. It is also used in the manufacture of industrial supplies, medical supplies and daily necessities, such as: rubber shoes, cord glue, adhesives, sealants, wires and cables, Sp...

AI Technical Summary

Problems solved by technology

Through the activation reaction and monomer prepolymerization reaction, a stable polymerization system is obtained, which solves the problems of glue hanging on the wall and pipeline blockage at the initial stage of polymerization, and ensures the continuous and stable operation of industrial equipment; adopts a double spiral belt with self-operated scraper in series with multiple reactors The polymerization system of the stirring full-mixing reactor solves the problem of rapid heat transfer in the high-viscosity polymerization system, realizes controllable polymerization temperature and stable product quality; by optimizing the synergy between the rare earth catalyst and the activator, the molecular weight and molecular weight distribution of the polymer are realized On-line control of Mooney viscosity, directly producing any brand of isoprene rubber products according to user needs, and ensuring the stability of the microstructure and macroscopic properties of the product between batches; by introducing a high-viscosity liquid carrier fluid, the resistance of glue liquid transportation is reduced, effectively It solves the transportation problem of high-viscosity liquid and reduces the difficulty of industrial scale-up

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