A post-treatment process for solution polymerization

A solution and polymer technology, applied in the field of polymer post-processing, can solve the problems of deactivating agent, terminating agent residue, removing deactivating agent, terminating agent, insufficient polymerization activity, etc. The effect of reducing the load

Active Publication Date: 2020-09-11
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the case where the cocatalyst is expensive and the polymerization activity cannot reach a particularly high level, it is still only in the laboratory research stage, and there are no reports on related processes.
[0007] In addition, in the above process, it is difficult to completely remove the deactivator and terminator from the polymer, resulting in the residue of the deactivator and terminator in the polymer, which will also affect the performance of molded products made from the polymer, etc.

Method used

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  • A post-treatment process for solution polymerization
  • A post-treatment process for solution polymerization
  • A post-treatment process for solution polymerization

Examples

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preparation example Construction

[0055] Polymers can be prepared using techniques known in the art, such as solution polymerization, slurry polymerization, bulk polymerization and other methods. For example, it may be solution polymerization of α-olefin and cycloolefin, or polymerization of α-olefin and other monomers having polymerizable groups. The polymerization is carried out in the presence of a polymerization catalyst, which may be a commonly used catalyst in the art, such as a metallocene catalyst, a non-metallocene catalyst, or the like. In addition, in order to improve the polymerization efficiency, a co-catalyst is used in combination with the catalyst.

[0056] As cocatalysts, aluminoxanes and aluminum alkyls can be used.

[0057] As the aluminoxane, for example, a linear aluminoxane represented by the following general formula (I): (R)(R)Al-(Al(R)-O) n -O-Al(R)(R), and a cyclic aluminoxane represented by the following general formula (II): -(Al(R)-O-) n+2 -.

[0058]

[0059] In the aforeme...

Embodiment 1

[0105] Polymerization reaction of ethylene-norbornene copolymer, using toluene as solvent, main catalyst is 3,5-di-tert-butyl salicylidene 2-methylthioaniline titanium trichloride, co-catalyst is MAO, chain transfer agent For triethylaluminum. The amount of solvent added is 1L, so that the main catalyst concentration is 4×10 -5 mol / L, add MAO so that the ratio of MAO to aluminum and titanium is 1000:1, add triethylaluminum so that the ratio of triethylaluminum to aluminum and titanium is 20:1, the polymerization temperature is 75°C, the polymerization pressure is 0.2MPa, the reaction time for 15 minutes. After the polymerization reaction is completed, post-treatment is performed. The specific post-processing process is:

[0106] The toluene solution of ethylene-norbornene copolymer from the polymerization unit first enters the gas and liquid phase removal unit, which contains 3 flash tanks, and the pressure of the flash tank is controlled at 0.01MPa. In this unit, ethylene,...

Embodiment 2

[0113] Except that the reclaimed MAO solution obtained in Example 1 was used as the cocatalyst, the polymerization conditions, polymerization process and post-treatment process were the same as in Example 1.

[0114] The recovery of recovered MAO was determined to be 85%. Polymerization activity and polymer physical properties test are shown in the following table:

[0115]

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Abstract

The present invention provides a recovery method of a co-catalyst. The recovery method of the co-catalyst comprises the following steps: step (1): a polymer solid containing the co-catalyst is contacted with a solvent to obtain a slurry; and step (2): the polymer solid is separated from the slurry obtained from the step (1) and the co-catalyst is recovered; wherein the polymer solid containing theco-catalyst is contacted with the solvent at a temperature of 20-70DEG C. According to the recovery method of the co-catalyst, the co-catalyst can be recovered and reused efficiently and simply undera condition of maintaining the activity of the co-catalyst.

Description

technical field [0001] The invention belongs to the field of post-treatment of polymers, and in particular relates to a method for recovering co-catalysts and a method for preparing polymers. Background technique [0002] Solution polymerization is one of the important polymerization methods in the field of polymer manufacturing. It has the advantages of small size of polymerization reactor, short polymerization reaction time, less transition material when switching product grades, high production flexibility, high single-pass conversion rate of monomer, gel Low content, uniform monomer distribution, stable product quality, and the ability to produce products with special properties. Therefore, solution polymerization has always been one of the directions that people pay close attention to. [0003] At present, there are three main processes for solution polymerization involving α-olefins in the world: medium pressure solution polymerization process, low pressure adiabatic s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F6/06C08F6/12C08F210/02C08F232/08C08F2/06C08F210/16C08F210/14C08F210/06
CPCC08F6/06C08F6/12C08F210/02C08F210/16C08L23/0823C08L23/0815C08F232/08C08F2/06
Inventor 郭峰汪文睿李传峰檀子娟杨爱武柏基业
Owner SINOPEC YANGZI PETROCHEM
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