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Catalyst system and prepolymerization catalyst for olefin polymerization and olefin polymerization process

A technology of olefin polymerization and catalyst, which is applied in the field of olefin polymerization, can solve the problems of decreased catalyst activity, increased resin ash content, and affecting resin performance, etc., to achieve the effect of increasing molecular weight, reducing ash content, and maintaining isotacticity

Active Publication Date: 2021-08-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these catalysts already have good orientation ability, it is still necessary to add an external electron donor to ensure the isotactic index of the final resin during polymerization; and adding an external electron donor usually causes a large decrease in catalyst activity, resulting in a decrease in resin ash content. increase, affecting the properties of the resin

Method used

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  • Catalyst system and prepolymerization catalyst for olefin polymerization and olefin polymerization process
  • Catalyst system and prepolymerization catalyst for olefin polymerization and olefin polymerization process
  • Catalyst system and prepolymerization catalyst for olefin polymerization and olefin polymerization process

Examples

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preparation example Construction

[0039] The specific preparation method of the spherical magnesium alkoxide carrier includes: mixing anhydrous magnesium halide and low-carbon alcohol, adding or not adding an electron donor compound, heating and reacting to form a magnesium halide alkoxide melt, and the reaction temperature is 90 ~140°C, after high shear in the dispersion medium, put it into the cooled inert medium to form spherical magnesium halide alcoholate particles, and obtain spherical carriers after washing and drying. High shear can be obtained by conventional methods, such as high-speed stirring method (such as CN1330086A), spray method (such as US6020279A), and high gravity rotating bed (such as CN1580136A) and emulsifier method (CN1463990A). The dispersion medium can use hydrocarbon inert solvents, such as kerosene, white oil, silicone oil, paraffin oil, vaseline oil, etc. The cooling inert medium can be selected from pentane, hexane, heptane, petroleum ether, raffinate and the like.

[0040] Accor...

Embodiment 1

[0067] This example is used to illustrate the catalyst system and olefin polymerization method of the present invention.

[0068] 1. Preparation of solid catalyst components

[0069] Preparation of spherical magnesium chloride alcoholate: mix anhydrous magnesium chloride and ethanol at a molar ratio of 1:2.6, heat up and react to form a magnesium chloride alcoholate melt, the reaction temperature is 90-140°C, in the dispersion medium white oil and silicone oil. After high-speed stirring, it is placed in cooled hexane to form spherical magnesium chloride alcoholate particles, which are washed and dried to obtain spherical magnesium chloride alcoholate carriers.

[0070] Preparation of spherical solid catalyst components: Add 100mL of titanium tetrachloride to a 300mL stirred glass reaction bottle fully replaced by high-purity nitrogen, cool to -20°C, add spherical magnesium chloride alcoholate, and slowly heat up to 110°C, add 1.5mL of 2-isopropyl-2-isopentyl-1,3-dimethoxyprop...

Embodiment 2

[0077] This example is used to illustrate the catalyst system and olefin polymerization method of the present invention.

[0078] Same as Example 1, except that the hexane solution of 2-butyldiethylmalonate was replaced by the hexane solution of benzylidene diethylmalonate of the same concentration. The aggregation results are shown in Table 1.

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Abstract

The invention belongs to the field of olefin polymerization catalysts, and specifically discloses a catalyst system for olefin polymerization, a prepolymerization catalyst and an olefin polymerization method. The catalyst system comprises the reaction product of the following components: 1) solid catalyst component: comprising magnesium, titanium, halogen and an internal electron donor compound; the internal electron donor compound comprises a glycol ester compound and a diether compound; 2) Aluminum alkyl compound; 3) External electron donor compound: selected from malonate compounds. The catalyst system of the invention has high catalyst activity, good hydrogen adjustment sensitivity, and improved polymer isotacticity. In addition, the catalyst system of the invention can be used to prepare high rigidity products under the condition of low hydrogenation amount.

Description

technical field [0001] The invention belongs to the field of olefin polymerization catalysts, and in particular relates to a catalyst system for olefin polymerization, a prepolymerization catalyst for olefin polymerization, and an olefin polymerization method. Background technique [0002] The activity, stereospecificity and hydrogen modulation sensitivity of polyolefin catalysts are very important indicators. The improvement of catalyst activity can optimize the utilization of the device, which is of great economic significance; the catalyst activity also directly affects the ash content of the polymer. Under the condition of the same catalyst addition, the higher the activity, the lower the ash content of the product in the form of titanium, magnesium, aluminum, etc. Different polyolefin catalysts have different stereospecificities, which directly determine the regularity of the microstructure of the product, which in turn affects the mechanical properties of the product. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F110/06C08F4/649
CPCC08F4/6494C08F10/00C08F110/06
Inventor 张晓帆张军辉赵惠林洁夏先知赵瑾张天一万真
Owner CHINA PETROLEUM & CHEM CORP