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Modified silica gel carrier and supported metallocene catalyst, preparation methods thereof as well as metallocene catalyst system

A metallocene catalyst and metallocene technology, applied in the field of supported metallocene catalyst and its preparation, modified silica gel carrier and its preparation, metallocene catalyst system for olefin polymerization, can solve uncontrollable, poor particle shape of carrier, polymerization The molecular weight of the compound and its distribution changes, etc., to achieve the effect of simple preparation method, high bulk density and high polymerization activity

Active Publication Date: 2017-12-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many research reports on metallocene loading, among which SiO 2 It is the most reported study of carrier (such as CN1174848A, CN1174849A, CN1356343A, US4,808,561, US5,026,797, US5,763,543, US5,661,098), but the preparation method of this type of carrier is complicated, the cost of catalyst loading is high, and the carrier granular shape poor, uncontrollable
[0004] There are also documents (US4265785, US20010006931) directly using alkylaluminum and manganese dichloride as additives to prepare catalysts for polymerization, which significantly improves the polymerization activity, but the molecular weight and distribution of the polymer change greatly, and the polymerization cannot be effectively controlled. performance

Method used

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  • Modified silica gel carrier and supported metallocene catalyst, preparation methods thereof as well as metallocene catalyst system
  • Modified silica gel carrier and supported metallocene catalyst, preparation methods thereof as well as metallocene catalyst system
  • Modified silica gel carrier and supported metallocene catalyst, preparation methods thereof as well as metallocene catalyst system

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preparation example Construction

[0030] According to a second aspect of the present invention, the present invention provides a method for preparing the above-mentioned modified silica gel carrier, the method comprising:

[0031] 1) In the presence of the first solvent, manganese chloride is reacted with silica gel to obtain a manganese chloride / silica gel carrier;

[0032] 2) Reacting the manganese chloride / silica gel support with an alkylaluminoxane in the presence of a second solvent.

[0033] In step 1), based on the total weight of manganese chloride and silica gel, the amount of manganese chloride can be 0.1-60% by weight, preferably 0.5-45% by weight.

[0034] In step 1), the reaction is usually carried out under the protection condition of an inert gas (for example, nitrogen). The first solvent can be used to dissolve the manganese chloride, and then the silica gel can be added to carry out the reaction. The reaction can be carried out under stirring, and the reaction conditions can include: the tem...

Embodiment 1

[0079] This example is used to illustrate the modified silica gel carrier and supported metallocene catalyst of the present invention and their respective preparation methods.

[0080] 1) Preparation of manganese chloride / silica gel carrier

[0081] Under the protection of nitrogen, add 0.52 g of anhydrous manganese chloride to the glass reactor at room temperature, then add 350 ml of tetrahydrofuran, start stirring, add 13.9 g of silica gel into the reactor, raise the temperature to 65 ° C, stir and dissolve for 2 hours , and the solvent was evaporated at 80°C to obtain a white solid powder. The white solid powder was vacuum-dried at 100°C for 2 hours, and then vacuum-dried at 300°C for 10 hours to obtain a manganese chloride / silica gel carrier with good fluidity. Through gas chromatography analysis, no tetrahydrofuran was detected.

[0082] 2) Preparation of alkylaluminoxane / manganese chloride / silica gel carrier

[0083] Under nitrogen protection, take 4.64 grams of the ma...

Embodiment 2

[0087] This example is used to illustrate the modified silica gel carrier and supported metallocene catalyst of the present invention and their respective preparation methods.

[0088] 1) Preparation of manganese chloride / silica gel carrier

[0089] Under the protection of nitrogen, add 0.8 g of anhydrous manganese chloride to the glass reactor at room temperature, then add 250 ml of tetrahydrofuran, start stirring, add 7.0 g of silica gel into the reactor, heat up to 65 ° C, stir and dissolve for 2 hours, The solvent was evaporated at 80°C to give a white solid powder. The white solid powder was vacuum-dried at 100°C for 2 hours, and then vacuum-dried at 300°C for 10 hours to obtain a manganese chloride / silica gel carrier with good fluidity. Through gas chromatography analysis, no tetrahydrofuran was detected.

[0090] 2) Preparation of alkylaluminoxane / manganese chloride / silica gel carrier

[0091] Under the protection of nitrogen, take 4.13 grams of the manganese chloride...

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Abstract

The invention belongs to the field of olefin polymerization catalysts and particularly relates to a modified silica gel carrier and a supported metallocene catalyst, preparation methods thereof as well as a metallocene catalyst system. The modified silica gel carrier comprises the following reaction products: silica gel, manganese chloride and alkylaluminoxane; alkylaluminoxane has the general formula as shown in the specification, wherein R is selected from C1-C12 alkyls; and a is an integer from 4 to 30, and preferably, an integer from 10 to 30. The preparation method of the modified silica gel carrier is simple, and the prepared catalyst is good in particle morphology; in addition, the supported metallocene catalyst is wide in application range in term of an olefin polymerization process and high in polymerization activity, the obtained polymers are high in stacking density, and the molecular weights and distribution of the polymers are basically kept constant.

Description

technical field [0001] The invention belongs to the field of olefin polymerization catalysts, and specifically relates to a modified silica gel carrier and a preparation method thereof, a supported metallocene catalyst and a preparation method thereof, and a metallocene catalyst system for olefin polymerization. Background technique [0002] The development and application of metallocene catalysts is another major breakthrough in the field of olefin polymerization catalysts after the traditional Ziegler-Natta catalysts, especially in the 1980s, Kaminsky and Sinn et al. (Angew.Chem., 1980,19,390; Adv.Organoment. Chem., 1980, 18, 99.) developed a high-efficiency cocatalyst methylaluminoxane (MAO), making the research on metallocene catalysts enter a stage of rapid development. Because the homogeneous metallocene catalyst requires a large amount of MAO to achieve high activity, the production cost is high, and the obtained polymer is amorphous, so it cannot be used in the widel...

Claims

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Application Information

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IPC IPC(8): C08F4/02C08F4/643C08F4/6592C08F110/02
CPCC08F4/027C08F4/643C08F4/65925C08F110/02
Inventor 刘东兵刘雨平李岩高榕周俊领
Owner CHINA PETROLEUM & CHEM CORP
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