Preparation method of polypropylene with wide molecular weight distribution and polymer thereof

A wide molecular weight distribution, polypropylene technology, applied in the preparation method of polypropylene and its polymer field, can solve the problems of complex asymmetric hydrogenation step-by-step polymerization operation, large fluctuation of product performance indicators, etc., and achieve xylene soluble Low material, excellent physical properties and processing properties, and the effect of stable control of performance indicators

Active Publication Date: 2010-06-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the asymmetric hydrogenation step polymerization opera...

Method used

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  • Preparation method of polypropylene with wide molecular weight distribution and polymer thereof
  • Preparation method of polypropylene with wide molecular weight distribution and polymer thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The preparation of catalyst component: in the glass reaction vial of 500ml, add 100ml titanium tetrachloride, add 8g spherical magnesium chloride alcoholate (MgCl 2 2.6C 2 h 5 OH), the temperature was raised to 120°C, 1.5ml of 2,4-pentanediol dibenzoate and 0.5ml of dibutyl phthalate were added during the temperature rise, and the temperature was maintained at 120°C for 1 hour, and the solution was filtered off. Add 100ml of titanium tetrachloride, stir at 120°C for 0.5 hour, and filter off the solution. The solid was washed with 100 ml of hexane and dried under vacuum to obtain a solid catalyst component. The content of 2,4-pentanediol dibenzoate in the catalyst component is 10.6wt%, and the content of dibutyl phthalate is 2.8wt%.

[0049] Propylene polymerization: in a 5L autoclave, purging with nitrogen gas flow, then introduce 5ml of triethylaluminum hexane solution (the concentration of triethylaluminum is 0.05mmol / ml), 1ml of triethylaluminum in nitrogen gas fl...

Embodiment 2

[0072] Preparation of catalyst components: at 3m 3 Add 1.5m 3 Titanium tetrachloride, add 180kg spherical magnesium chloride alcoholate (MgCl 2 2·6C 2 h 5 OH), the temperature was raised to 120°C, and 36kg of 2,4-pentanediol dibenzoate and 11.3kg of dibutyl phthalate were added during the heating process, and the temperature was maintained at 120°C for 1 hour, and the solution was filtered off. Join 1.5m 3 Titanium tetrachloride was stirred at 120°C for 0.5 hour, and the solution was filtered off. The solid was washed with 1.5 m3 of hexane and dried under vacuum to obtain a solid catalyst component. The content of 2,4-pentanediol dibenzoate in the catalyst component is 9.0wt%, and the content of dibutyl phthalate is 4.0wt%.

[0073] Propylene polymerization: In a 120,000-ton / year single-loop polymerization reactor, continuously add propylene and hydrogen, the above-prepared catalyst components (with a concentration of 230g / L paste) and triethylaluminum as external electr...

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Abstract

The invention provides a preparation method of molecular weight distribution polypropylene and a polymer thereof. By using the method, polymerization reaction is carried out in a single reactor or a plurality of series reactors in the presence of catalysts, wherein the catalysts are reactants containing the following components: (1) at least one solid catalyst component comprising magnesium, titanium, halogen and at least two electron donors of a and b, wherein the electron donor a is selected from a diol ester compound; the electron donor b is selected from unitary or multi-element aliphatic carboxylic ester, aromatic aliphatic carboxylic ester or diether compounds; and the weight ratio of the electron donor a to the electron donor b is 2-80; (2) an alkyl aluminum compound; and (3) optimally, an external electron donor component. The acrylic polymer has the advantages of wide molecular weight distribution, high isotacticity and the like; meanwhile, the preparation method has simple operation.

Description

technical field [0001] The present invention relates to a method for preparing polypropylene and its polymer, more particularly to a method for preparing polypropylene with a wide molecular weight distribution and its polymer. technical background [0002] In general, polypropylene resins with a broad molecular weight distribution usually have better performance, because the high molecular weight fraction provides high modulus, high impact strength and high melt strength of the resin, and the low molecular weight fraction provides high melt flow In addition, the wide molecular weight distribution polypropylene melt has a shear thinning effect, so the wide molecular weight distribution polypropylene is more competitive than the narrow distribution propylene polymer. [0003] In the industrial production and synthesis of polypropylene with wide molecular weight distribution, stepwise polymerization is mostly used. [0004] For example, US Pat. No. 7,365,136 discloses a method...

Claims

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Application Information

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IPC IPC(8): C08F10/06C08F4/654C08F4/651
Inventor 刘月祥夏先知王新生张天一高平乔素珍尹茂平李威莅张继贵赵瑾彭人琪
Owner CHINA PETROLEUM & CHEM CORP
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