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Rare earth catalysis system and application thereof in preparation of conjugated diene liquid rubber

A technology of rare earth catalysis and conjugated dienes, which is applied in the field of catalysts and can solve problems such as rubber difficulties

Active Publication Date: 2013-01-23
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this invention is to solve the problem that the existing catalytic system is difficult to prepare rubber with low molecular weight (relative molecular mass less than 10000) and narrow molecular weight distribution (molecular weight distribution PDI is 1.0-2.0), and to provide a rare earth catalytic system And its application in the preparation of conjugated diene liquid rubber

Method used

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  • Rare earth catalysis system and application thereof in preparation of conjugated diene liquid rubber
  • Rare earth catalysis system and application thereof in preparation of conjugated diene liquid rubber

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Embodiment １

[0036] In the 10mL catalyst reaction bottle filled with nitrogen after vacuum baking, add neodymium isopropoxide (Nd), isoprene (IP) and diisobutylaluminum hydride (Al), dichlorodimethyl Silane (Cl), react in a constant temperature water bath at 20°C for 60 minutes to obtain a homogeneous rare earth catalyst, the molar ratio of [Nd] / [Al] / [Cl] / [IP] in this catalyst is 1 / 10 / 4 / 3 .

Embodiment 2

[0038] In the 10mL catalyst reaction bottle filled with nitrogen after vacuum baking, add lanthanum isopropoxide (La), isoprene (IP) and diisobutylaluminum hydride (Al), carbon tetrachloride ( Cl), react in a constant temperature water bath at 20°C for 60 minutes to obtain a homogeneous rare earth catalyst, and the molar ratio of [La] / [Al] / [Cl] / [IP] in this catalyst is 1 / 10 / 4 / 3.

Embodiment 3

[0040] In the 10mL catalyst reaction bottle filled with nitrogen after vacuum baking, add samarium n-propoxide (Sm), isoprene (IP) and diethylaluminum hydride (Al), dichlorodimethylsilane in sequence (Cl), react in a constant temperature water bath at 60°C for 20 minutes to obtain a homogeneous rare earth catalyst, and the molar ratio of [Sm] / [Al] / [Cl] / [IP] in this catalyst is 1 / 5 / 4 / 10.

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Abstract

The invention provides a rare earth catalysis system and application of the rare earth catalysis system in preparation of conjugated diene liquid rubber, and relates to the field of catalysts, aiming at solving the problem that the rubber which is low in molecular weight and narrow in molecular weight distribution is hard to prepare by the existing catalysis system. The rare earth catalysis system comprises an alkoxy rare earth compound, a hydrogenated alkyl aluminum compound, chloride and conjugated alkadiene. The alkoxy rare earth compound is ethoxy neodymium, n-propyloxy neodymium, n-propyloxy lanthanum, n-propyloxy samarium, isopropoxy neodymium, isopropoxy lanthanum, isopropoxy samarium, isobutoxy neodymium, isobutoxy lanthanum, isobutoxy samarium, tert-butoxy neodymium, iso-octyl oxygroup neodymium, iso-octyl oxygroup lanthanum or iso-octyl oxygroup samarium. The invention further provides the application of the rare earth catalysis system in the preparation of the conjugated diene liquid rubber. The molecular weight of the prepared conjugated diene liquid rubber is 1.0*10<3>-8.22*10<3>, and the molecular weight dispersion index of the prepared conjugated diene liquid rubber is 1.1-1.4.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a rare earth catalyst system and its application in preparing conjugated diene liquid rubber. Background technique [0002] The composition of the rare earth neodymium catalyst system currently used for the synthesis of diene rubber is Nd-AlR 3 -X (rare earth neodymium compound-alkylaluminum-halogen compound), can be divided into two types of binary components and ternary components. Binary rare earth compounds contain halogen, the general formula is NdX 3 -nL / AlR 3 , L is a neutral ligand; the rare earth compound in the ternary rare earth catalytic system does not contain halogen, and a halogen-containing compound needs to be added. The composition of the binary catalyst system is simple, but the rare earth chloride of the binary catalyst system has poor solubility in organic solvents, which limits the development of the binary catalyst. At present, there is no industrialized binary...

Claims

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Application Information

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IPC IPC(8): C08F4/54C08F4/58C08F136/08C08F136/06
Inventor 张学全王凤张春雨白晨曦毕吉福代全权那丽华于琦周
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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