Homogenous neodymium-based rare earth catalyst, and its preparation method and application

A rare earth catalyst and catalyst technology, applied in the field of neodymium-based homogeneous rare earth catalysts and their preparation, can solve the problems of large amount of alkyl aluminum, high catalyst cost, and poor performance, and achieve high activity, excellent processing performance, and good stability Effect

Active Publication Date: 2012-07-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low content of cis 1,4-structure, the performance of tire products is poor, and the amount of alkylaluminum in the catalyst is relatively large, and the cost of the catalyst is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The concentration of the solution of neodymium naphthenate in cyclohexane is 0.2 mol / l. The concentration of diisobutylaluminum hydride and diethylaluminum chloride in cyclohexane is 1 mol / l. The water value of the solvent is lower than 15ppm, and the oxygen is exhausted with nitrogen before use; the aging tank is dried and oxygenated.

[0041] Under the protection of nitrogen, add 580g cyclohexane solution in the 2L catalyst aging kettle, then add 54ml isoprene, 60ml neodymium naphthenate solution and 192ml diisobutylaluminum hydride solution in the aging kettle, at 20 ℃ and stirring conditions for 15 minutes of contact reaction. Then, 42ml of diethylaluminum chloride solution was added into the aging kettle, and aged at 10°C for 30 minutes. The catalyst concentration was 1.0×10 -5 mol / ml.

[0042] Under the protection of nitrogen, 400 g of isoprene, 1541 g of cyclohexane and 88 ml of catalyst were successively added into a 5 L polymerization kettle, and the monome...

Embodiment 2

[0044] Triisobutylaluminum and sesquiethylaluminum were respectively prepared into hexane solutions with a concentration of 0.5 mol / l for future use. Neodymium naphthenate is prepared into a hexane solution with a concentration of 0.2 mol / l for later use. The treatment mode of the solvent and the aging tank is the same as in Example 1.

[0045] Under the protection of nitrogen, add 195ml of isoprene, 130ml of neodymium naphthenate solution, 936ml of triisobutylaluminum solution, 104ml of sesquiethylaluminum solution and 1278g of hexane solution into a 5L catalyst aging kettle, at 10°C and aging under stirring conditions for 2 hours. The catalyst concentration is 0.8×10 -5 mol / ml.

[0046] Under the protection of nitrogen, 350 g of isoprene, 1800 g of hexane and 103 ml of catalyst were successively added into a 5 L polymerization kettle, and the monomer concentration was 15%. After reacting at 15°C for 1.5 hours, the polymer solution was discharged from the kettle and 2,6-d...

Embodiment 3

[0048] Triisobutylaluminum and diethylaluminum chloride were respectively prepared into hexane solutions with a concentration of 0.5 mol / l for future use. Neodymium neodecanoate was prepared into a hexane solution with a concentration of 0.2 mol / l for later use. The treatment mode of the solvent and the aging tank is the same as in Example 1.

[0049] Under the protection of nitrogen, add 158g of hexane solution, 20ml of butadiene, 30ml of neodymium naphthenate solution and 180ml of triisobutylaluminum solution into a 1L catalyst aging kettle, and contact and react for 10 minutes at 25°C under stirring conditions, Then 30ml of diethylaluminum chloride solution was added to continue aging at 25°C for 1 hour. The catalyst concentration was 1.2×10 -5 mol / ml.

[0050] Under the protection of nitrogen, 350 g of isoprene, 1800 g of hexane and 56 ml of catalyst were successively added into a 5 L polymerization kettle, and the monomer concentration was 15.4%. After reacting at 10°...

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PUM

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Abstract

The invention relates to a novel homogenous neodymium-based rare earth catalyst, and a preparation method of the catalyst and application in polymerization of conjugated diene. The synthesis method of the catalyst is simple and easy to control, thus the obtained catalyst has high activity and good stability. By using the inventive homogenous neodymium-based rare earth catalyst for catalyzing polymerization of isoprene, the polymerization process is stable, easy to control, and suitable for continuous operation, and polyisoprene with a cis structure content higher than 98% and adjustable Mooney viscosity range within 60-100 can be synthesized.

Description

technical field [0001] The invention relates to a rare earth catalyst, in particular to a novel neodymium homogeneous rare earth catalyst and a preparation method thereof. The neodymium-based homogeneous rare-earth catalyst of the invention is especially suitable as a catalyst for the polymerization of conjugated dienes to synthesize polymers with high cis-structure content. technical background [0002] Conjugated dienes (such as butadiene and isoprene) can synthesize stereoregular polymers through coordination polymerization to produce important synthetic rubber varieties (such as cis-1,4-polybutadiene and cis-1 , 4-polyisoprene). Polyisoprene rubber with high cis-structure content has tensile crystallization properties similar to natural rubber, and has excellent physical and mechanical properties. It is the only variety in synthetic rubber that can replace natural rubber. It is widely used in tires, medical, hose tapes and other industries. Among them, the tire indust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F4/54C08F4/52C08F36/04C08F36/08
Inventor 张杰李传清谭金枚梁爱民徐林于国柱欧阳素芳杨亮亮赵姜维辛益双
Owner CHINA PETROLEUM & CHEM CORP
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