Composition used for rare earth catalyst, rare earth catalyst and its application

A rare earth compound and rare earth catalyst technology, applied in the field of rare earth catalyst compositions, can solve the problems of poor stability, high gel content of diolefin polymers, difficult control of molecular weight and molecular weight distribution, etc., and achieve stable quality and good stability. Effect

Active Publication Date: 2013-12-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the heterogeneous phase state of the catalyst, there are multiple active centers with different lifetimes, and the stability is very poor, which makes the catalytic process and polymerization process difficult to control. High, low cis 1,4-structure content, and the possibility of bimodal distribution of molecular weight and wide distribution, difficult to control molecular weight and molecular weight distribution, etc.
[0003] By adding an electron donor to the neodymium chloride catalyst system, the solubility of neodymium chloride can be increased, which is beneficial to the catalyst acti

Method used

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  • Composition used for rare earth catalyst, rare earth catalyst and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Catalyst preparation:

[0049] 300ml of NdCl 3 ·3C 2 h 5 OH / hexane dispersion (Nd content: 6 mmol) was added to the aging reactor, then 12 g of isoprene was added, and then 300 ml of triisobutylaluminum (Al content was 168 mmol) was added under stirring conditions, and the temperature was continued at room temperature for 20 ℃ for 1 hour to obtain neodymium-based rare earth catalyst C1. The degree of polymerization of the isoprene prepolymer in the catalyst was 268.

[0050] Solution polymerization of isoprene using prepared catalyst C1:

[0051] Under the protection of nitrogen, 400 g of isoprene, 1491 g of cyclohexane and 160 ml of catalyst C1 were successively added into a 5 L polymerization kettle, and the monomer concentration was 20% by weight. After reacting at 30° C. for 1 hour, the polymer solution was discharged from the kettle and 2,6-di-tert-butylhydroquinone methanol solution was added to terminate the reaction. The monomer conversion rate is 80%, the...

Embodiment 2

[0053] Catalyst preparation:

[0054] 300ml of NdCl 3 ·3C 3 h 7 Add OH / hexane dispersion (Nd content is 6mmol) into the aging reactor, then add 1.1mol / l isoprene hexane solution 210ml, then add triethylaluminum 90ml (Al content is 90mmol ), and continue to stand at 50° C. for 0.5 hour to obtain the neodymium-based rare earth catalyst C2. The degree of polymerization of the isoprene prepolymer in the catalyst was 380.

[0055] Solution polymerization of isoprene using prepared catalyst C2:

[0056] Under the protection of nitrogen, 350 g of isoprene, 1907 g of hexane and 112 ml of catalyst C2 were sequentially added into a 5 L polymerization kettle, and the monomer concentration was 15% by weight. After reacting at 50° C. for 1 hour, the polymer solution was released from the kettle and 2,6-di-tert-butylhydroquinone methanol solution was added to terminate the reaction. The monomer conversion rate was 91%, the cis 1,4-structure content in the polymer was 96.0%, the Mooney...

Embodiment 3

[0058] Catalyst preparation:

[0059] 200ml of NdCl 3 2THF / hexane dispersion (with Nd content of 5mmol) was added to the aging reactor, then 20g of isoprene was added, and then 160ml of triethylaluminum (with an Al content of 80mmol) and 410g of hexane were added under stirring conditions, Continue to stand at room temperature 15° C. for 1.5 hours to obtain neodymium-based rare earth catalyst C3. The degree of polymerization of the isoprene prepolymer in the catalyst was 750.

[0060] Solution polymerization of isoprene using prepared catalyst C3:

[0061] Under the protection of nitrogen, 250 g of isoprene, 2148 g of hexane and 150 ml of catalyst C3 were successively added into a 5 L polymerization kettle, and the monomer concentration was 10% by weight. After reacting at 10° C. for 3.5 hours, the polymer solution was released from the kettle and 2,6-di-tert-butylhydroquinone methanol solution was added to terminate the reaction. The monomer conversion rate was 89%, the c...

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Abstract

The invention provides a composition used for a rare earth catalyst. The composition contains alkyl aluminum and/or alkyl aluminum hydride, a rare earth compound and conjugated diene. The rare earth compound is a compound having a general formula as MR3.nL, wherein M is a rare earth metal, R is halogen, L is an electron-donating ligand, and the value of n is 1-3. Also, the alkyl aluminum and/or alkyl aluminum hydride, the rare earth compound and the conjugated diene are in a molar ratio of 0.05-1.5:0.01-0.05:1. The invention provides a rare earth catalyst, which is obtained by enabling the composition provided in the invention to contact an inert organic solvent mutually under the protection of an inert gas. Specifically, the contact condition enables the conjugated diene in the composition to polymerize so as to obtain a conjugated diene polymer with a polymerization degree of not less than 150. The invention also provides application of the catalyst in the polymerization of conjugated diene. The rare earth catalyst provided in the invention has good stability, and is in favor of synthesizing polymer products with stable quality and uniformity when it is used for conjugated diene polymerization.

Description

technical field [0001] The invention relates to a rare earth catalyst composition, a rare earth catalyst and the application of the rare earth catalyst in the polymerization of conjugated dienes. Background technique [0002] Neodymium chloride / alkyl aluminum rare earth catalyst is the earliest neodymium rare earth catalyst used in the polymerization of conjugated dienes. NdCl is used in "Rare Earth Catalytic Synthetic Rubber Collection" 3 -C 2 h 5 OH-Al(C 2 h 5 ) 3 The catalyst is used to polymerize butadiene or isoprene to obtain cis-polybutadiene or cis-polyisoprene. However, due to the heterogeneous phase state of the catalyst, there are multiple active centers with different lifetimes, and the stability is very poor, which makes the catalytic process and polymerization process difficult to control. High, low content of cis 1,4-structure, and possible problems such as bimodal distribution of molecular weight and wide distribution, difficulty in controlling molecul...

Claims

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Application Information

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IPC IPC(8): C08F4/54C08F4/52C08F36/04
Inventor 谭金枚张杰王超欧阳素芳杨亮亮赵姜维孙伟辛益双李传清徐林于国柱梁爱民
Owner CHINA PETROLEUM & CHEM CORP
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