Catalyst charging method in neodymium polybutadiene rubber polymerization processes

A technology of polybutadiene rubber and feeding method, applied in the field of rubber production, can solve the problems of large fluctuation of reaction temperature, high Mooney, unsatisfactory reaction effect, etc., and achieves stable temperature and stable product quality, which is beneficial to Mooney. control effect

Inactive Publication Date: 2014-07-30
华宇橡胶有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the process of preparing neodymium-based polybutadiene rubber by the existing method, the catalyst adopts a three-way aging catalyst to add all at once to the reaction, the reaction temperature fluctuates greatly, and the Mooney High, unsatisfactory response

Method used

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  • Catalyst charging method in neodymium polybutadiene rubber polymerization processes

Examples

Experimental program
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Effect test

Embodiment 2

[0021] Embodiment 2 (new method):

[0022] (1) Mix the mixed catalyst composed of sesquiethylaluminum chloride (referred to as sesquialuminum), diisobutylaluminum hydride (abbreviated as aluminum hydride), and neodymium neodecanoate in a certain proportion through a static mixer for ternary Aging, aging time 25-35min, temperature 25°C-35°C; (2) After aging, the mixed catalyst and butyl oil enter the premixing tank for buffering and then enter the polymerization tank to participate in the polymerization reaction. The pressure of the polymerization tank is 0.35-0.45MPa , The temperature of the first polymerization tank is 60°C-75°C, and the temperature of the remaining polymerization tanks is 60-90°C; Butyl oil includes butadiene and solvent oil, and the solvent oil is n-hexane; (3) At the same time, partially hydrogenated diisobutyl Aluminum (referred to as single-added aluminum) is directly added from the middle and lower part of the premixing tank without aging, and enters th...

Embodiment 3

[0030] Embodiment 3 (new method):

[0031] The amount of mixed catalyst used in ternary aging remains unchanged, the formula of monohydrogenated diisobutylaluminum (abbreviated as mono-added aluminum) and neodecanoic acid neodymium is adjusted to HAL / Nd (mol / mol) 1.8:1, and the rest are the same as in the examples 2 is the same. After testing, the Mooney is 47, and the temperature fluctuation is between 66°C and 75°C.

Embodiment 4

[0032] Embodiment 4 (new method):

[0033] The amount of mixed catalyst used in ternary aging remains unchanged, the formula of monohydrogenated diisobutylaluminum (referred to as mono-added aluminum) and neodecanoic acid neodymium is adjusted to HAL / Nd (mol / mol) 4:1, and the rest are the same as in the examples 2 is the same. It reflects that the trend basically tends to be stable, and the temperature fluctuation is between 70°C±2°C. Mooney 44, the response state tends to be stable with little fluctuation.

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Abstract

The invention discloses a catalyst charging method in neodymium polybutadiene rubber polymerization processes. The catalyst charging method comprises following steps: (1) ethylaluminum sesquichloride, diisobutylaluminum hydride, and neodymium neodecanoate are mixed according to a certain ratio so as to obtain a mixed catalyst, the mixed catalyst is delivered into a static mixer for ternary aging, wherein aging time ranges from 25 to 35min, and aging temperature ranges from 25 to 35 DEG C; (2) the mixed catalyst obtained via aging is delivered into a premixing kettle with a mixture of butadiene and a solvent oil for buffer treatment, and then an obtained mixed material is delivered into a polymerization kettle for polymerization, wherein pressure of the polymerization kettle ranges from 0.35 to 0.45 MPa, a first polymerization kettle temperature ranges from 60 to 75 DEG C; and (3) a part of diisobutylaluminum hydride is directly added through the middle-lower part of the premixing kettle into the polymerization kettle without aging, and is reacted with the mixed material obtained via step (2) for polymerization so as to prepare polybutadiene rubber. Beneficial effects of the catalyst charging method are that: reaction is stable; activity is stable; temperature is stable; the catalyst charging method is beneficial for Mooney viscosity control; and polybutadiene rubber product quality is stable.

Description

technical field [0001] The invention belongs to the field of rubber production and relates to a catalyst feeding method in the polymerization process of neodymium-based polybutadiene rubber. Background technique [0002] In the process of preparing neodymium-based polybutadiene rubber in the existing method, a three-way aging catalyst is used as a catalyst and added to the reaction at one time, the reaction temperature fluctuates greatly, the Mooney is high, and the reaction effect is not ideal. Contents of the invention [0003] In order to make up for the deficiencies of the prior art, the invention provides a catalyst feeding method in the polymerization process of neodymium-based polybutadiene rubber with stable reaction, stable activity and favorable Mooney control. [0004] The present invention is achieved through the following technical solutions: [0005] Catalyst feeding method in the neodymium series polybutadiene rubber polymerization process of th...

Claims

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Application Information

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IPC IPC(8): C08F136/06C08F2/00
Inventor 王胜伟朱建民贺卫伟刘玉生王守勇
Owner 华宇橡胶有限责任公司
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