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A kind of metallocene catalyst system and its method of catalyzing olefin polymerization

A metallocene catalyst and catalyst technology, applied in the field of olefin polymerization, can solve the problems of limited development and further application, high toxicity of toluene, low catalytic activity, etc., and achieve the effects of high molecular weight, reduced production cost, and high catalytic activity

Active Publication Date: 2021-03-19
北京引发科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with saturated alkane solvents, toluene is highly toxic, pollutes the environment, is expensive, and is difficult to remove from polymers, which limits its development and further application.
[0003] Ji et al. reported a class of metallocene catalytic systems soluble in saturated alkanes, consisting of a mono-titanocene complex procatalyst containing phenolic oxyanion ligands and diisooctyl phosphate (P204) and a MAO cocatalyst. Composition, the highest catalytic activity is only 1.1×10 6 g polymer mol -1 of Ti·h -1 , low catalytic activity (see Procedia Engineering, 2011, 18, 422–426)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] At 50°C, 10 wt% MMAO / heptane solution (component B) and 1,3-bis(2, 6-diisopropylphenyl)-iminoimidazoline-isooctanoic acid-cyclopentadienyl titanium chloride (component A) / hexane solution, wherein the moles of Al in component B and Ti in component A The ratio was 2000:1. After 30 minutes of polymerization, 5% ethanol solution of hydrochloric acid was added to terminate the reaction. The obtained copolymer was vacuum-dried at 40° C. to constant weight to obtain 3.7 g of binary copolymer. The catalyst activity is 1.5×10 6 g polymer mol -1 of Ti·h -1 , the weight average molecular weight of the copolymer (M w ) is 3.2×10 5 , molecular weight distribution index (M w / M n ) is 2.1; the ethylene content in the copolymer is 61wt%, and the propylene content is 39wt%.

Embodiment 2

[0049] At 50°C, add 10 wt% MMAO / heptane solution (component B) and component A and triisobutyl Aluminum (component C) is mixed for 1 minute and added to the polymerization system. The molar ratio of Al in component B to Ti in component A is 1000:1, and the molar ratio of Ti in component C to component A is 20: 1. The polymerization time was 30 minutes, and the termination process was the same as in Example 1 to obtain 2.8 g of binary copolymers. The catalytic activity is 1.1×10 6 gpolymer mol -1 of Ti·h -1 ; M of the copolymer w 3.8×10 5 ,M w / M n It is 2.0; the ethylene content in the copolymer is 66wt%, and the propylene content is 34wt%.

Embodiment 3

[0051] The polymerization process is as described in Example 2, except that the molar ratio of Al in component B to Ti in component A is 300:1, and the molar ratio of Ti in component C to component A is 100:1, 5.4 g of binary copolymer were obtained. The catalytic activity is 2.2×10 6 gpolymer mol -1 of Ti·h -1 . Copolymer M w 2.7×10 5 ,M w / M n It is 2.3; the ethylene content in the copolymer is 56wt%, and the propylene content is 44wt%.

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PUM

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Abstract

The invention relates to the technical field of olefin polymerization, and provides a metallocene catalyst system and a method for catalyzing olefin polymerization through the metallocene catalyst system. The metallocene catalyst system comprises a component A, a component B, and optionally a component C, wherein the component A is a metallocene compound, the component B is aluminoxane or modifiedaluminoxane, the component C is an alkyl aluminum compound, the general formula of the metallocene compound is L1L2L3MX, L1 is selected from cyclopentadienyl or a cyclopentadienyl derivative, L2 is the same as L1 or is a monodentate anionic ligand, and L3 is selected from C4-C20 alkoxy negative ions, carboxylic acid negative ions, phosphate negative ions or sulfate negative ions. The method for catalyzing olefin-based monomer polymerization through the metallocene catalyst system comprises: making the catalyst system contact a monomer solution, and carrying out a polymerization reaction. According to the present invention, with the catalyst system and the polymerization method, the environment protection advantage can be achieved, and the high catalytic activity and the high monomer conversion rate can be maintained while the catalyst consumption can be substantially reduced.

Description

technical field [0001] The invention relates to the technical field of olefin polymerization, and more specifically, to a metallocene catalyst system and a method for catalyzing olefin polymerization. Background technique [0002] Metallocene catalysts are widely used in olefin polymerization because of their high catalytic activity, narrow relative molecular weight distribution of polymers, and controllable polymer structures (see Chem.Rev., 2000, 1205-1220; Prog.Polym . Sci., 2008, 33, 797-819). The metallocene catalyst consists of metallocene compound (main catalyst) and methyl aluminoxane (MAO), modified methyl alkoxide aluminum (MMAO) or organoboron compound (co-catalyst). The structure of the main catalyst, especially the structure of the ligand, has an important influence on the catalytic activity and the structure of the polymerization product. Therefore, metallocene catalysts with different catalytic properties can be obtained by designing and synthesizing ligands ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/06C08F210/02C08F232/08C08F4/6592
CPCC08F4/6592C08F210/02C08F210/06C08F232/08
Inventor 吴一弦张树曲俊腾张志乾
Owner 北京引发科技有限公司