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Method for preparing superhigh molecular weight polythene catalyst and application thereof

An ultra-high molecular weight, catalyst technology, applied in the production of bulk chemicals, etc., can solve the problem of low polymerization activity of catalysts, and achieve the effect of simple and feasible preparation method, stable polymerization reaction, and simplified polymerization process

Inactive Publication Date: 2008-08-06
SHANGHAI RES INST OF CHEM IND
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  • Abstract
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Problems solved by technology

However, the polymerization activity of the catalyst is not high

Method used

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  • Method for preparing superhigh molecular weight polythene catalyst and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0033] (1) Preparation of new ecological magnesium compounds:

[0034] Under nitrogen protection, magnesium powder reacts with halogenated alkanes in alkane solvents to obtain the general formula (RMgX) y (MgX 2 ), wherein y=0.02-1, preferably 0.05-0.43, R is an alkyl group containing 3-12 carbons, X is halogen, preferably chlorine.

[0035] The reaction temperature is controlled at 10-100°C, preferably 20-80°C, and the reaction time is 0.5-10 hours, preferably 1-8 hours. After the reaction is completed, a new ecological magnesium compound is obtained, which is washed with a clean alkane solvent. The new eco-magnesium compound is dried several times to make it into a solid state for later use. The molar ratio of the magnesium powder to the halogenated alkane is 1: (1-3).

[0036] Alkane solvents are aliphatic hydrocarbons, alicyclic hydrocarbons and aromatic hydrocarbons, such as n-pentane, isopentane, n-hexane, n-octane, cyclopentane, cyclohexane, benzene, 1,2-dichloroetha...

Embodiment 1

[0065] (1) Preparation of new ecological magnesium chloride

[0066]Add 2.5L of hexane and 48g of magnesium powder into a 5L reactor equipped with pressure and temperature controllers and stirrers, add 418mL of n-chlorobutane into the reactor at 60°C for 3.0 hours, after the addition is complete , and continued to react at 60° C. for 4 hours to obtain a neoecological magnesium chloride solid suspension. Evaporate the hexane solvent at 70°C, add 3.0L tetrahydrofuran into the reactor after cooling, and stir evenly to obtain a new ecological magnesium chloride solution. After analysis, it can be seen that Mg: 1.6328mol / L, Cl: 2.8411mol / L, Cl / Mg=1.74, (BuMgCl) 0.35 (MgCl 2 );

[0067] (2) Preparation of main component of titanium-containing catalyst

[0068] Filter the solution obtained in step (1) into another 10L reactor, add 73ml of titanium tetrachloride, 124ml of diethylaluminum chloride, and 3.0L of tetrahydrofuran, heat up to 60°C and keep the reaction at this temperatu...

Embodiment 2

[0077] (1), (2) and (3) steps are with embodiment 1; It can be known that new ecological magnesium chloride is (BuMgCl) after analysis 0.02 (MgCl 2 );

[0078] Samples were taken for analysis, and the residual amount of tetrahydrofuran in the main component of the titanium-containing catalyst was 21 wt%.

[0079] (4) Preactivate the main component of the titanium-containing catalyst

[0080] Take out 18g from the main component of the solid titanium-containing catalyst prepared by the above method for pre-activation treatment, add 100mL of hexane solvent to dilute at room temperature, and then inject activator, wherein 3mL of tri-n-hexylaluminum, diethyl chloride Aluminum 3.5 mL (diethylaluminum chloride: tri-n-hexylaluminum = 2.5 (mol / mol)), stirred and mixed at 20°C for 2 hours.

[0081] Polymerization evaluation test:

[0082] Same as Example 1, see Table 1 for the result data of catalyst polymerization evaluation.

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Abstract

The invention relates to a preparation method of super high molecular weight polyethylene catalyst, which is characterized by comprising: (1) preparing the main components of ti-containing catalyst; (2) pre-activating the main components of a ti-containing catalyst; (3) using a catalyst promoter to completely activate the pre-activated main components of ti-containing catalyst. Compared with the prior art, the invention provides a preparation method of super high molecular weight polyethylene catalyst with high stack density and high activity, while the catalyst can be used for ethane polymerization directly, without pre-polymerization, thereby simplifying polymerization.

Description

technical field [0001] The invention belongs to the field of catalyst science and technology, and relates to a preparation method and application of an ultra-high molecular weight polyethylene catalyst. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) refers to linear polyethylene prepared by a low-pressure method. According to the definition of ASTM4020, linear polyethylene with a relative viscosity of 2.30 or higher, which is 0.05% of 100ml at 135°C Measured in Hydronaphthalene solution. Compared with other polyethylenes, it has high wear resistance, excellent toughness and thermal stability, and is widely used in textile industry, mechanical engineering, chemical industry and mining industry. [0003] Due to the huge molecular weight of UHMWPE, it is mainly used commercially in powder form. Therefore, the particle size and particle size distribution of polymer powder are particularly important. As the template of the polymer, the size and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F4/642
CPCY02P20/52
Inventor 肖明威余世炯叶晓峰
Owner SHANGHAI RES INST OF CHEM IND
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