Composition for increasing stereo tacticity of polypropylene and application thereof

A technology of tacticity and polypropylene, which is applied in the field of compositions for improving tacticity of polypropylene, to achieve the effects of easy implementation, improvement of the performance of polypropylene products, and improvement of tacticity

Inactive Publication Date: 2015-01-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, no one has found that the mixture of triethylaluminum and diethylaluminum chloride can be used to adjust the tacticity of propylene polymerization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Under the protection of high-purity nitrogen, in a 0.5-liter reactor with a mechanical stirring device, add the following substances in sequence: 200 milliliters of n-heptane, methylcyclohexyldimethoxysilane (with the titanium in the main catalyst) The molar ratio between is 5) and a mixture of diethylaluminum chloride and triethylaluminum in a molar ratio of 1:100 (the molar ratio of triethylaluminum to titanium in the main catalyst is 100); The temperature was raised to 60°C, and the nitrogen in the kettle was removed by vacuuming, and 0.018MPa of hydrogen and 0.3MPa of propylene were successively pressed into the kettle. After the solvent absorbed propylene to saturation, 0.10g of the main catalyst was added (the main catalyst was TiCl 4 / MgCl 2 Diisobutyl phthalate, whose titanium content is 2.8% (wt)), start the polymerization reaction, keep the pressure of propylene in the kettle at 0.3MPa during the polymerization by continuously replenishing propylene, at a rate...

Embodiment 2

[0024] Compared with Example 1, except that the molar ratio of 1:100 diethylaluminum chloride and triethylaluminum was changed to pure triethylaluminum, the rest of the operations and conditions were the same, after 0.5 hours of polymerization After the reaction, 33.4 g of the product was obtained.

[0025] The catalyst efficiency is 668gPP / g catalyst hour; The isotacticity of the polymer measured by n-heptane extraction method is 95.2%; The weight average molecular weight of the polymer measured by high temperature gel chromatography is 120,000, and the molecular weight distribution index It is 7.2; the maximum value of the crystalline melting peak of the polymer is measured at 160.7°C by differential scanning calorimetry (DSC).

Embodiment 3

[0027] Compared with Example 2, except that methylcyclohexyldimethoxysilane was not added, other operations and conditions were the same, and 15.7 g of the product was obtained after 0.5 hours of polymerization.

[0028] Catalyst efficiency is 314gPP / g catalyst hour; The isotacticity of polymer is 58.3% as measured by n-heptane extraction method; It is 8.5; the maximum value of the crystalline melting peak of the polymer is located at 159.2°C as measured by differential scanning calorimetry (DSC).

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Abstract

The invention discloses a composition for increasing the stereo tacticity of polypropylene and the application thereof. The composition comprises triethyl aluminum and aluminium diethyl monochloride. The composition for increasing the stereo tacticity of polypropylene can significantly improve the stereo tacticity of polypropylene, while improving catalytic efficiency, distribution uniformity of the molecular weight of polypropylene and polypropylene product performance, and has the advantages of simpleness, effectiveness and easiness for implementation.

Description

technical field [0001] The invention relates to a composition for improving the tacticity of polypropylene and its application. Background technique [0002] Isotactic polypropylene (iPP) is a synthetic polymer material with a wide range of uses. The mechanical properties, crystallization behavior, thermal properties, and material structure of iPP are closely related to its tacticity (also expressed as isotacticity). Isotactic polypropylene with high tacticity exhibits excellent mechanical properties such as high rigidity, high modulus, and high impact resistance, and can be used in a series of applications where polypropylene with low isotacticity is incompetent. Improving the isotacticity of polypropylene resin has important practical application value. The methods of adjusting the isotacticity of iPP used in the past industrial production practice and scientific research mainly include: improving the organic electron donor compound (internal electron donor) added in the...

Claims

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Application Information

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IPC IPC(8): C08F110/06C08F4/649C08F4/646
Inventor 胡庆云笪文忠梅利范志强傅智盛
Owner CHINA PETROLEUM & CHEM CORP
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