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Supported composite catalyst for producing high melt strength polypropylene

A high melt strength, composite catalyst technology, applied in the field of polyolefin catalysts, can solve problems such as hindering long-chain branch structures, and achieve the effects of simplifying the preparation process, saving equipment investment and energy investment

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The compounding of dual catalysts in situ to prepare long-chain branched polyethylene is widely used, but it is rarely used in polypropylene, because for polypropylene, the diversity of insertion and termination methods hinders long-chain branching. structure formation

Method used

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  • Supported composite catalyst for producing high melt strength polypropylene
  • Supported composite catalyst for producing high melt strength polypropylene
  • Supported composite catalyst for producing high melt strength polypropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Prepare a carrier with internal pores of 1.5 nm, particle size of 5.0 μm, external pores of 20 nm and thickness of 20 μm using ZSM-5 molecular sieve material.

[0025] Activated carrier: Take 200 g of the carrier and dry it at 200 ℃ for 2 h under the protection of nitrogen flow, then slowly raise the temperature to 600 ℃ and continue drying for 4 h to obtain the dehydrated carrier. The dehydrated carrier was dispersed in 5 L of hexane solvent, and 0.14 mol of triethylaluminum was added, stirred at 30°C for 2 h, and then dried to obtain a treated carrier.

[0026] (2) Take 5 mmol of iron acetylacetonate and 5 mmol of bisiminopyridine ligand and dissolve them in 100 ml of toluene at room temperature. After they are completely dissolved, add 10 g of the treatment carrier, heat up to 50 ℃, and stir. Run for 4 h, wash with toluene 3 times, purge and dry with nitrogen.

[0027] (3) Take 3.0 g of magnesium dichloride, dissolve it in 200 ml of tetrahydrofuran at 60 ℃, add 1 ml of...

Embodiment 2

[0034] (1) Prepare a carrier with an internal pore channel of 1.5 nm, a particle size of 5.0 μm, an external channel of 20 nm, and a thickness of 20 μm using diatomaceous earth materials.

[0035] Activated carrier: Take 200 g of the carrier and dry it at 200 ℃ for 2 h under the protection of nitrogen flow, then slowly raise the temperature to 600 ℃ and continue drying for 4 h to obtain the dehydrated carrier. The dehydrated carrier was dispersed in 5 L of hexane solvent, and 0.1 mol of triethylaluminum (for an alkyl aluminum or alkyl aluminum oxide) was added, stirred at 70°C for 1 h, and then dried to obtain a treated carrier.

[0036] (2) The obtained treatment carrier reduces the load of the late transition metal catalyst to prepare a composite catalyst. Compared with Example 1, the addition amount of iron acetylacetonate and the bisiminopyridine ligand are both 2 mmol, and the internal electron donor is ethyl benzoate. The other catalyst preparation conditions remain unchanged...

Embodiment 3

[0040] (1) Prepare a carrier with internal pores of 1.2 nm, particle size of 4.0 μm, external pores of 30 nm and thickness of 15 μm using montmorillonite material.

[0041] Take 100 g of the carrier and dry it at 200 ℃ for 2 h under the protection of nitrogen flow, then slowly raise the temperature to 600 ℃, and continue to dry for 4 h to obtain the dehydrated carrier. The dehydrated carrier was dispersed in 5 L of hexane solvent, and 0.10 mol of triethylaluminum was added, stirred for 2 h, and then dried to obtain a treated carrier.

[0042] (2) Take 3 mmol of cobalt chloride and 3 mmol of bisiminopyridine ligand, and dissolve them in 100 ml of toluene at room temperature. After they are completely dissolved, add 10 g of the treatment carrier and raise the temperature to 50 ℃. Stir and run for 4 h, wash with toluene 3 times, and dry with nitrogen.

[0043] (3) Take 5.2 g of magnesium dibromide, dissolve it in 200 ml of ether at 60 ℃, add 1.2 ml of phenyltriethoxysilane and 1 ml of ...

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Abstract

The invention discloses a supported composite catalyst for producing high melt strength polypropylene. The invention relates to a polyolefin catalyst which is prepared through the following steps: (1) preparing an inorganic support of which the internal pores are micropores and the external pores are mesoporous; (2) loading a late transition metal on the support by a dipping method, and drying; (3) independently dissolving the halide of magnesium in a polar solvent, and also adding a titanium compound and an internal electron donor; (4) pouring the solution obtained in the step (3) into the material obtained in the step (2), stirring, and then drying to obtain the catalyst. According to the invention, the high melt strength polypropylene can be obtained through in situ polymerization based on the preparation of the special catalyst; the subsequent polypropylene modification process is not required, so that the preparation process of the high melt strength polypropylene is simplified and the equipment investment and the energy investment also are saved.

Description

technical field [0001] The present invention relates to polyolefin catalysts, in particular to a supported Ziegler-Natta catalyst for the production of high melt strength polypropylene. Background technique [0002] Polypropylene (PP) resin has the characteristics of rich raw material sources, light weight, superior performance / price ratio, excellent heat resistance, chemical corrosion resistance, and easy recycling. It is one of the most widely used and fastest growing resins in the world. one. Polypropylene has low density, good mechanical properties, high temperature resistance, and excellent chemical stability. It is suitable for extrusion, injection molding, blow molding, and spinning, but it has defects in melt strength. This is mainly due to the general Ziegler Natta catalyst and The polypropylene prepared by the metallocene catalyst has only a linear chain structure and is in a partially crystalline state, resulting in low melt strength and poor sag resistance. At ...

Claims

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Application Information

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IPC IPC(8): C08F10/06C08F4/02C08F4/70
Inventor 梅利笪文忠胡庆云马广生
Owner CHINA PETROLEUM & CHEM CORP
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