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Catalyst component for olefin polymerization and preparation method thereof

A technology for olefin polymerization and catalysts, which is applied in the field of olefin polymerization catalyst components and the preparation of said catalysts, and can solve the problems of polymer isotacticity decline, reaction equipment blockage, and difficulty in industrial production, etc.

Active Publication Date: 2016-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned disclosed catalysts prepared with diether compounds as internal electron donors generally have the defect of narrow polymer molecular weight distribution in the practical application of olefin polymerization; Among the components, 2-n-pentyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 2-isopentyl-2-benzyl-1,3-dimethoxy 1,3-diether compounds such as propane are used as electron donors. Although the molecular weight distribution of the polymer can be broadened by using this type of catalyst in the practical application of olefin polymerization, but in the polymerization process, when the concentration of hydrogen during polymerization is increased , will lead to a sharp drop in the isotacticity of the polymer, not only cannot make good use of the concentration of hydrogen to adjust the molecular weight of the final polymer, but also easily cause blockage of the reaction equipment, making it difficult to realize industrial production

Method used

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  • Catalyst component for olefin polymerization and preparation method thereof
  • Catalyst component for olefin polymerization and preparation method thereof
  • Catalyst component for olefin polymerization and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Preparation of catalyst solid components

[0050] Under nitrogen protection, add 4.8g of anhydrous magnesium chloride, 19.5g of isooctyl alcohol and 19.5g of decane solvent into a 500ml reactor equipped with a stirrer, heat to 130°C, react for 1.5 hours until magnesium chloride is completely dissolved, and add 1.1g Phthalic anhydride, continue to react at 130°C for 1 hour to obtain an alcoholate; cool the alcoholate to room temperature. Under the protection of nitrogen, add the above alcoholate dropwise to 120ml titanium tetrachloride solution precooled to -22°C, slowly raise the temperature to 100°C, add 2-n-pentyl-2-(2-ethylhexyl) -1,3-dimethoxypropane 5mmol, 9,9-bis(methylmethoxy)fluorene 5mmol, heat up to 110°C for 2 hours, filter while hot, add 120ml of titanium tetrachloride, rise to 110 React for 1 hour and filter. The solid particles were washed 4 times with anhydrous hexane, and the solid catalyst was obtained after drying.

[0051] (2) Polymerization of...

Embodiment 2

[0054] Same as Example 1, the difference is that the temperature is raised to 100°C, "add 5 mmol of 2-n-pentyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 9,9-di( Methylmethoxy) fluorene 5mmol" is replaced by "Add the compound 2-n-pentyl-2-(2-ethylhexyl)-1,3-dimethoxypropane 3mmol and 9,9-bis(methylmethoxypropane Oxygen) fluorene 7mmol", the specific results are shown in Table 1.

Embodiment 3

[0056] Same as Example 1, the difference is that the temperature is raised to 100°C, "add 5 mmol of 2-n-pentyl-2-(2-ethylhexyl)-1,3-dimethoxypropane, 9,9-di( Methylmethoxy) fluorene 5mmol" is replaced by "Add compound 2-n-pentyl-2-(2-ethylhexyl)-1,3-dimethoxypropane 7mmol and 9,9-bis(methylmethoxypropane Oxygen)fluorene 3mmol", the specific results are shown in Table 1.

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Abstract

The invention provides a catalyst component for alkene polymerization reactions and a catalyst thereof. The catalyst component is prepared through the following steps: (1) mixing a magnesium compound with organic alcoholic compounds and an inert solvent, adding a precipitation assisting agent to carry out reactions; (2) contacting the alcoholic adduct obtained in the step (1) with a titanium compound solution at a low temperature, adding electron donor compounds a and b to carry out reactions, filtering so as to obtain solid particles; (3) adding the solid particles into a titanium compound solution, stirring to carry out reactions, filtering so as to obtain solid particles; (4) washing the solid particles with an inert solvent, and drying so as to obtain the catalyst component. When the catalyst is applied to propylene polymerization, a satisfactory polymerization yield can be obtained, furthermore, the polymer obtained has the advantages of high isotacticity, wide molecular weight distribution range, and good sensitivity to hydrogen, and even under a polymerization condition of high hydrogen gas concentration, the isotacticity of polymer can still be maintained in a high level and meets the requirement on industrial production.

Description

technical field [0001] The present invention relates to an olefin polymerization catalyst component and a method for preparing the catalyst, more specifically to an olefin polymerization catalyst component compounded with two electron donor compounds as an internal electron donor and its application. technical background [0002] It is well known that solid titanium catalyst components based on magnesium, titanium, halogen and electron donors can be used for CH 2 = CHR olefin polymerization, especially in the polymerization of α-olefins with 3 or more carbon atoms, where the electron donor compound is one of the essential components in the catalyst component, and along with the internal electron donor compound The development of polyolefin catalysts has led to continuous replacement. At present, binary aromatic carboxylic acid esters are commonly used, such as di-n-butyl phthalate or diisobutyl phthalate, etc., such as Chinese patent CN85100997A. [0003] In recent years, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F4/654C08F4/651C08F4/649
Inventor 陈建华高明智蔡晓霞刘海涛张晓帆马吉星李季禹王军李昌秀李现忠马晶胡建军
Owner CHINA PETROLEUM & CHEM CORP