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External electron donor of catalyst for propylene polymerization, catalyst system for propylene polymerization, and preparation method and application of external electron donor and catalyst system

An external electron donor, propylene polymerization technology, applied in the field of olefin polymerization, can solve the problems of active advance, easy agglomeration, electrostatic fluctuation and so on

Active Publication Date: 2019-03-29
锦州英诺威科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems existing in the existing propylene gas-phase fluidized bed, such as activity advancement, static electricity fluctuation, and easy agglomeration, the purpose of the embodiment of the present invention is to provide an external electron donor for propylene polymerization Ziegler-Natta catalyst, propylene Ziegler-Natta catalyst system for polymerization and its preparation method and application

Method used

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  • External electron donor of catalyst for propylene polymerization, catalyst system for propylene polymerization, and preparation method and application of external electron donor and catalyst system
  • External electron donor of catalyst for propylene polymerization, catalyst system for propylene polymerization, and preparation method and application of external electron donor and catalyst system
  • External electron donor of catalyst for propylene polymerization, catalyst system for propylene polymerization, and preparation method and application of external electron donor and catalyst system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Preparation method of Ziegler-Natta catalyst system for propylene polymerization:

[0054] 1) Under nitrogen protection conditions, at -40°C, the active center is added to the carrier;

[0055] 2) Gradually raise the temperature to 50°C, add aromatic ester, then raise the temperature to 100°C, keep it warm for 1 hour, continue to raise the temperature to 150°C, stir for 1 hour, and precipitate solid particles;

[0056] 3) The filtered solid particles are repeatedly washed alternately with active centers and inert diluents, and dried to obtain solid components;

[0057] 4) physically mixing the dried solids and 1,3-diether;

[0058] 5) The mixture, co-catalyst and external electron donor obtained in step 4) are added to the polymerization reactor in no particular order during the propylene polymerization reaction,

[0059] The molar ratio of carrier, active center, internal electron donor, cocatalyst and external electron donor in the prepared catalyst system is 0.2:0....

Embodiment 2

[0063]The preparation method of the Ziegler-Natta catalyst system for propylene polymerization in this example is the same as in Example 1, except that the external electron donor includes n-propyltrimethoxysilane, hydrogenated castor oil monoglyceride and diglycerol Dioleate, the molar ratio is 0.3:0.1:0.6.

[0064] Polymerization reaction of propylene: heat and vacuumize the 5L high-pressure reactor, remove air and water, replace with nitrogen, repeat three times, add catalyst system, first feed hydrogen, then feed propylene to make the total pressure in the kettle reach 0.35MPa.

[0065] Close the reaction kettle, raise the temperature of the kettle to 70°C, and start polymerization. After 2 hours of reaction, remove unreacted propylene to obtain polypropylene powder. The performance of the polymerization agent and the particle size distribution of the obtained polypropylene are shown in Table 1 and Table 2. .

Embodiment 3

[0067] The preparation method of the Ziegler-Natta catalyst system for propylene polymerization in this embodiment is the same as in Example 1, except that the external electron donor includes dicyclopentyl dimethoxysilane, hydrogenated castor oil monoglyceride acetate and di Polyglycerol dioleate, the molar ratio is 0.05:0.8:0.1.

[0068] Polymerization reaction of propylene: heat and vacuumize the 5L high-pressure reactor, remove air and water, replace with nitrogen, repeat three times, add catalyst system, first feed hydrogen, then feed propylene to make the total pressure in the kettle reach 0.35MPa.

[0069] Close the reaction kettle, raise the temperature of the kettle to 70°C, and start polymerization. After 2 hours of reaction, remove unreacted propylene to obtain polypropylene powder. The performance of the polymerization agent and the particle size distribution of the obtained polypropylene are shown in Table 1 and Table 2. .

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Abstract

The embodiment of the invention discloses an external electron donor of a catalyst for propylene polymerization. The external electron donor comprises siloxane, glycerol fatty acid ester and polyglycerol fatty acid ester, wherein the molar ratio of the siloxane to the glycerin fatty acid ester to the polyglycerol fatty acid ester is (0.01-0.8):(0.09-0.9):(0.09-0.9). According to the invention, a catalyst system comprising the external electron donor which is the mixture of the siloxane, the glycerin fatty acid ester and the polyglycerol fatty acid ester is a high-efficiency propylene polymerization catalyst, and the polymerization activity is high. The glycerin fatty acid ester and the polyglycerol fatty acid ester containing polar groups are selected as external electron donor components,and the problem of activity advancing caused by ethers to catalytic polymerization is successfully solved. The advantages are as the follows that a polymerization process is stable, static fluctuation does not occur easily, the polymerization product is not agglomerated easily and is not easily hung on a wall, and the like, so that long-term stable operation of polymerization production is ensured, and meanwhile, the amount of the obtained polymer fine powder is small, the bulk density is moderate, and the particle size distribution of particles is reasonable. The catalyst system is wide in application range and is suitable for propylene polymerization in various processes.

Description

technical field [0001] The invention relates to the technical field of olefin polymerization, in particular to an external electron donor of a Ziegler-Natta catalyst for propylene polymerization, a Ziegler-Natta catalyst system for propylene polymerization, and a preparation method and application thereof. Background technique [0002] Polypropylene (Polypropylene) is a semi-crystalline thermoplastic. Due to its strong impact resistance and relatively strong mechanical properties, it is widely used in electronic appliances, automobiles, building materials, medical treatment, packaging and other fields. [0003] There are many production methods of polypropylene, which can be divided into: slurry method, bulk method, gas phase method and gas phase bulk method according to the polymerization method. Due to the characteristics of simple production process and convenient operation, the gas phase production process is widely used. For these methods, some large chemical companies...

Claims

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Application Information

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IPC IPC(8): C08F10/06C08F110/06C08F4/649C08F4/646
CPCC08F10/06C08F110/06C08F4/6494C08F4/6465C08F2500/12C08F2500/15C08F2500/18
Inventor 田军委李明亮朱学亮刘洋苏美南
Owner 锦州英诺威科技服务有限公司
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