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Solid catalyst component for preparing ultra-high molecular weight polyethylene

A solid catalyst and ultra-high molecular weight technology, applied in the field of solid catalyst components, can solve the problems of complex preparation process, increased polymer processing difficulty, unsatisfactory particle shape control, etc., and achieves increased reaction capacity, high catalytic activity, Good bulk density

Active Publication Date: 2014-03-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the polymerization activity of the catalyst is not too high, and the preparation process is more complicated
[0003] In short, although the existing catalysts can realize the preparation of ultra-high molecular weight polyethylene, the bulk density of the prepared polymer is still not ideal, and the particle shape control is not satisfactory, which further increases the difficulty of polymer processing, and the comprehensive performance of the catalyst still needs to be improved.

Method used

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  • Solid catalyst component for preparing ultra-high molecular weight polyethylene
  • Solid catalyst component for preparing ultra-high molecular weight polyethylene
  • Solid catalyst component for preparing ultra-high molecular weight polyethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Preparation of 4,5-bis(dimethylamide)-di-n-butyl phthalate

[0031]

[0032] (a) Reflux 1mmol of pyrene carboxylic acid and 1mmol of ethylene glycol, 2 drops of concentrated sulfuric acid in 50mL of toluene solvent for 1h, and distill off the solvent;

[0033] (b) Reflux the compound obtained in the above steps and 2 mmol hexamethylphosphoric triamide in 50 mL benzene for 30 min, and distill off the solvent;

[0034] (c) Reflux the compound obtained in the above steps and 2 mmol potassium carbonate in a mixed solvent composed of 40 mL ethanol and 5 mL water for 30 min, adjust the pH value of the system to 4 with dilute hydrochloric acid, and evaporate the solvent;

[0035] (d) Reflux the compound obtained in the above steps with 2 mmol of n-butanol and 2 drops of concentrated sulfuric acid in 50 mL of toluene solvent for 1 h, and evaporate the solvent to obtain the compound 4,5-bis(dimethylamide)-phthalic acid di n-Butyl ester; Ms:420.23; 1HNMR (300MHz, CDCl 3 )...

Embodiment 2

[0041] 1. Preparation of 4,5-bis(diethylamide)-diisobutyl phthalate compound

[0042]

[0043] The preparation method of the above compound is the same as in Example 1, except that the hexamethylphosphoric triamide in step (b) is replaced by hexaethylphosphoric triamide, and n-butanol is replaced by isobutanol in step (d).

[0044] 2. Preparation of catalyst components

[0045] Add 2mmol ethoxymagnesium and 200mmol isooctyl alcohol into a reactor fully replaced by nitrogen, and pass CO 2 , stirred for 1.5h; the above solution was added to -20°C 100mmol titanium tetrachloride solution, after the addition was completed, the temperature was slowly raised to 40°C, and 0.1mmol 4,5-bis(diethylamide)-phthalic acid was added Diisobutyl, after stirring for 1 hour, filter and wash to obtain a solid; add 100 mmol titanium tetrachloride and 20 mmol n-butyl titanate mixture to the obtained solid, raise the temperature to 90 ° C, react for 2 hours, filter and wash, Dry in vacuo to obta...

Embodiment 3

[0049] Using the same diester compound, the preparation process of the solid main component of the catalytic body is the same as in Example 1, except that the amount of the diester compound is changed to 0.08 mmol. Polymerization is the same as in Example 1. The results are shown in the table.

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Abstract

The invention discloses a solid catalyst component for preparing ultra-high molecular weight polyethylene. The solid catalyst component is mainly composed of anhydrous magnesium compound, alcohol, halogenated titanium, a titanate compound and a diester compound and is characterized in that the diester compound satisfies the structure represented by a general formula (I), the mol ratio of magnesium to diester in the catalyst is (100: 1)-(20: 1), and the mol ratio of the magnesium to titanium is (50: 1)-(1: 1). The diester compound with a specific structure is used as an internal electron donor so as to increase reaction capacity of active centre of chain propagation of the catalyst in the polymerization process and increase the chain length; the catalyst can be used for preparing the ultra-high molecular weight polyethylene, the catalytic activity is high, and the powder form stacking density of the polymerisate is good. The invention further discloses a preparation method of the catalyst component.

Description

technical field [0001] The present invention relates to a solid catalyst component for producing ultra-high molecular weight polyethylene. Background technique [0002] Solid titanium catalyst with magnesium, titanium, halogen and electron donor as basic components is one of the main catalysts used in ethylene polymerization. Ultra-high molecular weight polyethylene (UHMWPE) refers to polyethylene with a molecular weight of more than 1 million. UHMWPE catalysts have higher performance requirements than supported titanium-based catalysts for the production of ordinary polyethylene. In the prior art, UHMWPE catalysts have been reported in many literatures, such as US5587440, US4962167, USApplication 0030193110, USApplication 0050245653, ZL00819563.3, CN200710037051.1, CN200710042467.2, CN200610116330.X3, etc. CN94105011 discloses dialkylmagnesium reacts with halogenating agent to form general formula Mg-X 2 reactants, and then react with titanium compounds under the action o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/02C08F4/649C08F4/651
Inventor 李艳芹黄安平张华强刘小燕谢克锋李广全李朋朋贾军纪朱博超王霞高琳宋赛楠
Owner PETROCHINA CO LTD
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