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Method for preparing polyolefin in-kettle alloy and polyolefin in-kettle alloy prepared by method

A technology for alloying and polyolefin in a kettle, applied in the field of olefin polymerization, can solve the problems of large amount of monomers, reduced polymerization reaction activity, low efficiency, etc.

Active Publication Date: 2020-11-17
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, 1,9-decadiene can realize the reactor method to synthesize heterogeneous copolymerized polypropylene with cross-linked structure of ethylene-propylene rubber phase, but 1,9-decadiene will reduce the activity of polymerization reaction, and the monomer consumption is large , the efficiency is also low, and both have not reported the low temperature impact properties and flexural modulus of polypropylene alloys

Method used

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  • Method for preparing polyolefin in-kettle alloy and polyolefin in-kettle alloy prepared by method

Examples

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preparation example Construction

[0025] The preparation method of polyolefin still alloy provided by the invention comprises the following steps:

[0026] 1) Use the first olefin monomer to carry out the first polymerization reaction in the presence of a catalyst, and then pass the second olefin monomer into the polymerization reaction system to carry out the second polymerization reaction, and the first olefin monomer is different from the second olefin a monomer, the first polymerization and / or the second polymerization is carried out in the presence of an organosilane;

[0027] 2) making water and / or alcohol contact with the product obtained in step 1),

[0028] Wherein, the general formula of the organosilane is R 1 m SiX n R 2 k , where R 1 for C 7 -C 20 1-Alkenyl, R 2 for C 2 -C 20 X is halogen, m, n and k are each 1 or 2, and m+n+k=4.

[0029] According to the present invention, preferably, the general formula of the organosilane is R 1 m SiX n R 2 k , multiple R in the same general fo...

Embodiment 1

[0046] (1) Homopolymerization of propylene In a 500ml dry autoclave, first add 50ml of dry n-hexane, then add 1ml of triethylaluminum with a concentration of 1.8mol / L, a diether-type olefin catalyst (MgCl 2 / TiCl 4 / BMMF, wherein, BMMF is the internal electron donor 9,9-bis(methoxymethyl)fluorene, MgCl 2 、TiCl 4 The mass ratio to BMMF is 73.6:15.2:11.2) 20.0 mg, add 0.2 g of bis-(7-octenyl) dichlorosilane, feed 0.06 g hydrogen, and then feed propylene gas, at 60 ° C, 0.4 Polymerization under MPa pressure for 30 minutes to obtain polypropylene granules, which are directly subjected to the next step of reaction.

[0047] (2) Ethylene-propylene copolymerization

[0048] Vent the propylene gas in the above step (1), and use a vacuum pump to remove the hexane solvent in the polymerization system. The vacuum degree is about 5 mmHg, and the removal time is about 5 minutes. Then feed the ethylene-propylene mixed gas whose molar ratio is 1:1, the polymerization temperature is contr...

Embodiment 2

[0050] According to the method of Example 1, the difference is that after the completion of the polymerization reaction, the gas in the reactor was vented, and then the polymer was transferred to 100°C deionized water to continue the reaction for 30 minutes, and then vacuum-dried at 60°C to obtain a solid Pellet Product Polypropylene Kettle Alloy.

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Abstract

The invention relates to the field of olefin polymerization, and discloses a method for preparing polyolefin in-kettle alloy and the polyolefin in-kettle alloy prepared by the method. The preparationmethod comprises the following steps: 1) carrying out a first polymerization reaction on a first olefin monomer in the presence of a catalyst, and introducing a second olefin monomer into the polymerization reaction system to carry out a second polymerization reaction, the first olefin monomer being different from the second olefin monomer, and the first polymerization reaction and / or the second polymerization reaction being carried out in the presence of organosilane; and 2) bringing water and / or alcohol into contact with the product obtained in the step 1), with the organosilane having a general formula of R1mSiXnR2k, wherein R1 is a 1-alkylene group of C7-C20, R2 is a 1-alkylene group of C2-C20, X is halogen, m, n and k are respectively 1 or 2, and m + n + k = 4. The polyolefin in-kettle alloy rubber disclosed by the invention is high in cross-linking degree, and has higher impact toughness and bending modulus.

Description

technical field [0001] The invention relates to the field of olefin polymerization, in particular to a method for preparing a polyolefin tank alloy and a polyolefin tank alloy prepared by the method. Background technique [0002] Polypropylene is indispensable in our life, and it is also one of the most widely used and fastest-growing synthetic resins. It has the characteristics of low density, high melting point, easy processing, and excellent comprehensive performance. It is widely used in automobiles, Home improvement, construction, packaging and agriculture and other fields. [0003] Polyolefin in-kettle alloy refers to the method of in-kettle polymerization to obtain polyolefin alloy directly from reaction monomers, thus replacing the traditional blending method of melt blending polymers. The most common polyolefin tank alloy is polypropylene tank alloy. The alloy in the polypropylene kettle is based on the particle reactor technology. The primary particles of polypro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/08C08F110/06C08F210/16C08F210/06C08K5/5425
CPCC08L23/12C08F210/16C08F110/06C08K5/5425C08K5/5406C08L2312/08C08L23/0815C08F210/06
Inventor 董金勇尹学敏秦亚伟
Owner INST OF CHEM CHINESE ACAD OF SCI
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