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Catalyst component, catalyst and preparation method thereof for olefin polymerization

A catalyst and solid catalyst technology, applied in the field of preparing the olefin polymerization catalyst components, can solve the problems of high xylene soluble content, low polymerization activity, and no mention of phosphorus content and the like

Active Publication Date: 2015-09-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The stereospecificity of the catalyst is still not high, and cannot meet the requirements of preparing products with high melt flow rate and high tacticity at the same time, and the polymerization activity is low
[0008] The patent CN101326201A discloses a catalyst component for the polymerization of ethylene olefins, including magnesium, titanium, halogen and a compound selected from phosphorus derivatives. The catalyst component can be used for ethylene homopolymerization or copolymerization, but the obtained polymer Low melt flow rate, high content of xylene solubles, and no mention of phosphorus content in the final catalyst component in the patent publication

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Preparation of catalyst solid components

[0043] In the reactor fully replaced by high-purity nitrogen, 4.8g of magnesium chloride, 97ml of toluene, 4ml of epichlorohydrin, and 12.5ml of tributyl phosphate were sequentially added, and the temperature was raised to 50°C under stirring and maintained for 2.5 hours. After the solid is completely dissolved, add 1.4 g of phthalic anhydride and keep it for 1 hour, cool the solution to below -25°C, and add TiCl dropwise within 1 hour 4 , slowly raised the temperature to 80°C, added 6 mmol of the electron donor compound diisobutyl phthalate, and maintained at 80°C for 1 hour. After filtering, add 70ml of toluene and wash twice. Add 60ml of toluene, TiCl 4 40ml, heated up to 110°C and maintained for 2 hours. After filtration, add toluene 60ml, TiCl 4 40ml, heated up to 110°C and maintained for 2 hours. After filtration, 80 ml of toluene and 2.66 g of tributyl phosphate were added, and the mixture was maintained at 90° ...

Embodiment 2

[0047] Same as Example 1, except that 1.33 g of tributyl phosphate is added during washing. Aggregated data are shown in Table 1.

Embodiment 3

[0049] Same as Example 1, except that 1.82 g of triethyl phosphate was added during washing. Aggregated data are shown in Table 1.

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Abstract

The invention provides a catalyst component for olefin polymerization. The catalyst component contains the reaction product of a magnesium compound, a titanium compound, a phosphorus-containing compound and a phosphorus-free internal electron donor compound. The phosphorus-containing compound is added in a step except the step of magnesium compound dissolution, and the catalyst component has a phosphorus content of 0.4-3.0wt%. The involved catalyst has strong stereospecificity and good hydrogen regulation sensitivity. When the catalyst is used for olefin polymerization, especially propylene polymerization, a product with a high isotactic index, a high melt flow rate and a low dimethylbenzene soluble substance content can be obtained simultaneously. Especially when the catalyst is used for propylene polymerization under a high hydrogen concentration condition, the obtained polymer can have a high melt flow rate, a high isotactic index and a low dimethylbenzene soluble substance content, and at the same time, the polymer has a relatively narrow molecular weight distribution.

Description

technical field [0001] The present invention relates to the field of olefin polymerization catalysts. Further, the present invention specifically relates to a catalyst component and catalyst for olefin polymerization containing magnesium, titanium, halogen and phosphorus. The present invention also relates to a process for preparing said olefin polymerization catalyst component. Background technique [0002] Stereoregularity and melt flow rate are two important indicators of polyolefins. Polyolefin products with high stereoregularity have high rigidity and crystallization properties, which are conducive to the production of high-strength products. Stereoregularity can usually be measured by isotactic index or xylene soluble content. Melt flow rate is a measure of a polymer's ability to flow under certain conditions. Melt flow rate provides an indicator of the processing properties of polymer resins, such as polymer resins must be softened or melted during extrusion or mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F4/646C08F4/654C08F10/02C08F10/06
Inventor 张晓帆高明智刘海涛蔡晓霞马吉星陈建华马晶王军李昌秀李现忠李季禹胡建军
Owner CHINA PETROLEUM & CHEM CORP
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