Devolatilization method of trans-butadiene-isoprene rubber

Abstract

The invention provides a devolatilization method of trans-butadiene-isoprene rubber, which comprises the following steps: (a) putting trans-butadiene-isoprene rubber into an extraction tank, introducing a supercritical fluid, and raising the extraction pressure to 5-35MPa, wherein the supercritical fluid is supercritical carbon dioxide; (b) under the extraction pressure, extracting the trans-butadiene-isoprene rubber through the flowing supercritical fluid to respectively obtain the supercritical fluid containing volatile components and the extracted trans-butadiene-isoprene rubber; and (c) reducing the pressure of the extracted trans-butadiene-isoprene rubber obtained in the step (b) to obtain devolatilized trans-butadiene-isoprene rubber. Compared with the prior art, according to the devolatilization method provided by the invention, residual monomers and dimers in the trans-butadiene-isoprene rubber are removed by utilizing the supercritical fluid, and by means of good solubility and diffusion performance of the supercritical fluid, a good overall effect is achieved under specific process steps and conditions, the solubility of volatile components in the fluid can be increased,the mass transfer rate of the volatile components in a polymer can be increased, and deep devolatilization is achieved.

Description

technical field [0001] The invention relates to the technical field of polymer devolatilization, more specifically, relates to a devolatilization method of trans-butadiene rubber. Background technique [0002] Trans-butadiene rubber is a new generation of functional synthetic rubber material, which has excellent fatigue resistance, wear resistance and low heat performance; at the same time, its preparation method adopts bulk polymerization, which has the advantages of simple process, low equipment investment, large production capacity, and easy Continuous, solvent-free, low production cost. [0003] The residual volatile matter in the polymer not only affects the performance of the product, but also causes environmental pollution, threatening people's safety and health. With the continuous improvement of people's awareness of environmental protection, safety and health, in the production process of trans-butadiene rubber, devolatilization has become a key process for post-p...

AI Technical Summary

Problems solved by technology

[0004] However, in actual production, such as the double-screw devolatilization process, as the volatile content continues to decrease, the viscosity of the system continues to increase. The high elasticity and high viscosity of the product hinder the interface renewal, resulting in an increase in system temperature, polymer degradation, and equipment failure. jam

If the volatile matter is removed simply by hot nitrogen purging, it can only increase the diffusion rate of the volatile matter on the polymer surface, but cannot increase the mass transfer rate of the volatile matter in the polymer.