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Ziegler-Natta catalyst

A Natta catalyst and catalyst technology, which is applied in the field of Ziegler-Natta catalysts, can solve the problems of poor activity and stereospecificity, high cost, and poor catalyst performance and activity, and achieve excellent comprehensive performance, high stereospecificity, and molecular weight. wide distribution effect

Active Publication Date: 2012-03-07
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Patent EP45977 discloses the use of unsubstituted maleic acid esters as internal electron donor compounds for the polymerization of olefins, resulting in poor activity and stereospecificity
Patent US5436213 relates to unsubstituted and 2-methyl unsubstituted maleic acid esters, the performance of the catalyst is poor especially in activity
Japanese patent JP58-138708 discloses an internal electron donor—an ester formed by a linear alcohol and a substituted or unsubstituted maleic acid. The performance of the catalyst is still unsatisfactory in terms of activity and stereospecificity
[0007] Patents CN1714105A, EP2002010049 and WO2003022894 disclose a series of monosubstituted and disubstituted maleic acid esters. The activity and stereospecificity of the catalyst are good, but the synthesis of the compound is difficult and costly

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1-7

[0043] 1. Synthesis of Maleate Compound

[0044] (1) Synthesis of dimethyl 7-oxabicyclo[2.2.1]hepta-2,5-diene-2,3-dicarboxylate

[0045] 14.2 g of dimethyl butyndioate and 50 mL of freshly distilled furan were added to a 100 mL flask, and heated to reflux with stirring for 12 hours. After the reaction mixture was cooled to room temperature, it was separated by column chromatography to obtain 19.3 g of an oily liquid product with a yield of 92%. 1 H NMR(TMS, CDCl 3 , 400MHz) analysis results: δ 5.79 (q, 2H, olefin H); δ 5.15 (q, 2H, CH); δ 3.73 (s, 6H, CH) 3 ).

[0046] (2) Synthesis of diethyl 7-oxabicyclo[2.2.1]heptane-2,5-diene-2,3-dicarboxylate

[0047] Add 10.5g of 7-oxabicyclo[2.2.1]heptane-2,5-diene-2,3-dicarboxylate to a beaker containing 100mL of 50% sodium hydroxide, stir at room temperature for 2 hours, and add Acidified with dilute hydrochloric acid, filtered, washed with water, dried and weighed to obtain 9.1g of 7-oxabicyclo[2.2.1]hept-2,5-diene-2,3-dicarboxylic acid wit...

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Abstract

The invention discloses a Ziegler-Natta catalyst, which concretely comprises the following components of: (a) 10-25% of magnesium by weight, 1-10% of titanium by weight, 40-60% of halogen by weight and 1-30% of catalyst component of at least one maleic acid ester selected from the general formula (I) by weight; (b) alkyl aluminum compounds; and (c) optionally, an external electron donor. Because a maleic acid ester compound with a special structure is adopted to be the external electron donor, the catalyst with excellent combination property is obtained, when the catalyst is used for propylene copolymerization, satisfactory copolymerization yield can be obtained, and the polymer has higher stereospecificity.

Description

Technical field [0001] The present invention relates to a Ziegler-Natta catalyst, in particular to a Ziegler-Natta catalyst for propylene (co)polymerization. Background technique [0002] As we all know, Ziegler-Natta catalyst is a solid titanium catalyst component with magnesium, titanium, halogen and electron donor as basic components, which can be used for CH 2 =CHR olefin polymerization, especially in the polymerization of α-olefins with 3 or more carbon atoms, a polymer with higher yield and higher stereoregularity can be obtained. Among them, the electron donor is one of the indispensable components of the catalyst component, and the development of the electron donor compound has led to the continuous updating of Ziegler-Natta catalysts. [0003] Earlier, a large number of electron donor compounds have been reported in the literature, such as polycarboxylic acids, mono- or poly-carboxylic acid esters, acid anhydrides, ketones, monoethers or polyethers, alcohols, amines, etc. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/06C08F4/649
Inventor 胡徐腾杨战军朱博超赵旭涛贾军纪刘文霞徐光华李洁张平生刘小燕黄春波王海王雄郝萍任峰
Owner PETROCHINA CO LTD