Cascade catalytic system and method for preparing LLDPE by using system

A technology for catalytic preparation and catalyst, applied in the field of LLDPE, can solve the problems of affecting the mechanical properties of polymers, reducing the molecular weight of polymers, etc.

Active Publication Date: 2020-09-15
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although many cascaded catalytic systems have been reported in the literature, most of them are not specific to the ethylene / α-olefin copolymer production equipment and its polymerization conditions currently being used in industry
After the addition of comonomers to traditional copolymerization catalysts, the molecular weight of the polymer decreases significantly, which affects the mechanical properties of the polymer

Method used

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  • Cascade catalytic system and method for preparing LLDPE by using system
  • Cascade catalytic system and method for preparing LLDPE by using system
  • Cascade catalytic system and method for preparing LLDPE by using system

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1-1

[0134] Dissolve pyrrole (1 mol) and 2-pyrrole formaldehyde (1 mol) in 100 ml of pentane solution, slowly add phosphorus oxychloride (0.2 mol) dropwise at room temperature, react for 1-2 hours, and filter to obtain the insoluble pentane solution Dipyrrole cationic salt, ionic salt dissolved in Ca(OH) 2 In the pentane solution of the suspension, shake vigorously for 5-10 minutes to obtain a pentane solution of dipyrromethene. At -78°C, add excess n-butyllithium (3mol) dropwise to the dipyrromethene pentane solution, slowly warm up to room temperature, stir for 2 to 3 hours, filter and add diphenyl to the solution at -78°C Phosphine chloride (2.5mol), stirred for 2 to 3 hours, overnight at room temperature, purified by column chromatography, and recrystallized to obtain the ligand L 1 . 1 H NMR (400MHz, CDCl 3 ): 3.80~4.0(m, 1H) 7.24~7.35(m, 20H) 7.0~7.10(m, 2H), 5.8~6.1(m, 4H). in the N 2 Add dehydrated methylcyclohexane (200ml), tetrahydrofuran chromium chloride (100μmol) ...

preparation Embodiment 1-2

[0137] At room temperature, trimethylacetaldehyde (2mol) and pyrrole (4.5mol) were dissolved in 100ml of dichloromethane solution, and trifluoroacetic acid (20mL) was dissolved in dichloromethane solution, stirred for 3 to 4 hours to generate a dipyrromethene solution, and at -78°C, add an excess of n-butyllithium (3mol) dropwise to the dipyrromethene solution, slowly warm up to room temperature, stir for 2 to 3 hours, and filter in Diphenylphosphine chloride (2.5mol) was added to the solution at -78°C, stirred for 2-3 hours, left overnight at room temperature, purified by column chromatography, and recrystallized to obtain the ligand L 2 . 1 H NMR (400MHz, CDCl 3 ): 3.68~3.80(m, 1H), 7.24~7.35(m, 20H), 70.0~7.10(m, 2H), 5.8~6.1(m, 4H), 0.95(s, 9H). in the N 2 Add dehydrated toluene (200ml), tetrahydrofuran chromium chloride (100μmol) and ligand L to the replaced Schlenk glass bottle2 (120 μmol), and stirred for 12 minutes to obtain a homogeneous solution of the first catal...

preparation Embodiment 1-3

[0140] The trimethyl acetaldehyde in embodiment 1-2 is changed into isobutyraldehyde, and other conditions are unchanged, obtain ligand L 3 . 1 H NMR (400MHz, CDCl 3 ):3.80~4.0(m, 1H), 7.24~7.35(m, 20H), 7.0~7.10(m, 2H), 5.8~6.1(m, 4H), 0.95(s, 6H), 2.40~2.50(m, 1H ). in the N 2 Add dehydrated Isopar E (200ml), tetrahydrofuran chromium chloride (100μmol) and ligand L to the replaced Schlenk glass bottle 3 (120 μmol), and stirred for 10 minutes to obtain a homogeneous solution of the first catalyst I-c.

[0141]

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Abstract

The invention relates to a catalyst composition for preparing LLDPE by cascade catalysis, a catalytic polymerization system for preparing LLDPE by cascade catalysis comprising the catalyst composition, a method for preparing LLDPE by using the polymerization system, and LLDPE prepared by the method. The catalyst combination comprises a first catalyst, a second catalyst and a cocatalyst, wherein the first catalyst is a pyrrolophosphine metal complex represented by a formula I, the second catalyst is an arylamino ether metal complex represented by a formula II, and the cocatalyst is selected from at least one of alkylaluminoxane, alkylaluminium or modified alkylaluminoxane. The LLDPE prepared by using the catalyst composition is relatively high in molecular weight, narrow in molecular weightdistribution and excellent in performance.

Description

technical field [0001] The invention belongs to the field of ethylene polymerization, and relates to a catalyst combination for preparing LLDPE by cascade catalysis, a catalytic polymerization system for preparing LLDPE by cascade catalysis comprising the catalyst combination, a method for preparing LLDPE by using the polymerization system, and the method Prepared LLDPE. Background technique [0002] Linear low density polyethylene (LLDPE) is a type of vinyl copolymer with 1-butene, 1-hexene or 1-octene as comonomers. LLDPE has high mechanical strength and good processing performance, and is widely used in film, pipe, molding and other fields. At present, the mainstream production process of LLDPE in China uses 1-butene as comonomer, while developed countries in Europe and the United States use 1-hexene and 1-octene as main comonomers to produce LLDPE. Compared with 1-butene, copolymers prepared with 1-hexene, 1-octene and other higher α-olefins as comonomers have better t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/16C08F210/14C08F4/69C08F4/642
CPCC08F210/16C08F2410/04C08F210/14C08F2500/03C08F4/69086C08F4/642C08F4/64189
Inventor 刘帮明张彦雨陈冠良张鹏坤黄传兵郭华陈海波
Owner WANHUA CHEM GRP CO LTD
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