Method for preparing rare earth catalyst applied to isoprene rubber production

Abstract

The invention discloses a method for preparing a rare earth catalyst applied to isoprene rubber production, and provides a technology for preparing a catalyst required by industrial and continuous polymerization production, and a high-activity high-uniformity catalytic system required by industrial production of isoprene rubber. By controlling the feeding speed of each component of the catalyst and fully mixing components of the catalyst, the coordination reaction is controlled, so that the preparation efficiency and performance indexes of the rare earth catalyst are improved. In the process of preparing the rare earth catalyst, at least two preparation devices for fully mixing materials are used to alternately perform preparation and standing ageing of the catalyst. The materials for preparing the catalyst comprise a hexane solvent, and neodymium naphthenate, sesquiethyl aluminum chloride and triisobutyl aluminum which are mixed in sequence, and the molar ratio of Nd to Cl to Al is 1:(2-4):(10-20); the preparation and ageing temperatures are controlled to be between 0 and 40DEG C; and the ageing concentration (based on Nd) is 0.01 to 0.05mol / L, and the ageing time is controlled to be 1-24 hours.

Description

technical field [0001] The invention relates to a preparation method of a rare-earth catalyst applied to the production of isoprene rubber, that is, the manufacturing process and preparation control points for realizing industrialization, continuous preparation and production supply, and belongs to the technical field of polymer materials and production automation. Background technique [0002] Cis-1,4-polyisoprene rubber (referred to as isoprene rubber) is an important synthetic rubber obtained by directional polymerization of isoprene. It has excellent comprehensive properties because of its molecular structure and natural rubber The same, the performance is close to natural rubber, so it is also commonly known as synthetic natural rubber. It can be used alone or in combination with natural rubber or other synthetic rubber to replace or partially replace natural rubber. [0003] The production of isoprene rubber in foreign countries originated in the 1960s. The production...

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Problems solved by technology

[0010] And the more critical restrictive factor is, in the small-scale catalyst preparation process in the existing laboratory, the feeding rate of each component of the catalyst is easy to control uniformly and slowly, and it is also easy to mix uniformly between each component, but industrial production The feeding speed and mixing degree in the process have not been controlled and solved by key links, and have not attracted the attention and understanding of relevant R&D and production personnel

In fact, the feeding speed and mixing uniformity of each component of the rare earth catalyst have a great influence on the catalyst activity. The degree of uniformity directly affects the structure of the coordination product, which directly leads to the difference in catalyst activity

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