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Ziegler-Natta catalyst

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

Active Publication Date: 2010-09-08
PETROCHINA CO LTD
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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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Embodiment 1-7

[0043] 1. Synthesis of maleic acid ester compounds

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

[0045] Add 14.2 g of dimethyl butynedioate and 50 mL of freshly steamed furan into a 100 mL flask, and heat under reflux for 12 hours while stirring. 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: δ5.79(q, 2H, alkene H); δ5.15(q, 2H, CH); δ3.73(s, 6H, CH 3 ).

[0046] (2) Synthesis of 7-oxabicyclo[2.2.1]hepta-2,5-diene-2,3-dicarboxylic acid diethyl ester

[0047] Add 10.5g of 7-oxabicyclo[2.2.1]hept-2,5-diene-2,3-dicarboxylate into a beaker containing 100mL of 50% sodium hydroxide, stir at room temperature for 2 hours, add Acidify with dilute hydrochloric acid, filter, wash with water, and weigh after drying to obtain 9.1g of 7-oxabicyclo[2.2.1]hept-2,5-diene-...

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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 the basic components, which can be used for CH 2 =CHR Polymerization of olefins, especially in the polymerization of α-olefins with 3 carbon atoms or more, can give polymers with higher yield and higher stereoregularity. Among them, the electron donor is one of the essential components in the catalyst components, and with the development of electron donor compounds, Ziegler-Natta catalysts are constantly updated. [0003] Earlier, a large number of electron donor compounds were reported in the literature, such as polycarboxylic acids, monobasic or polycarboxylic acid esters, acid anhydrides, ketones, monoethers or polyethers, alcohols, amines, etc. and their...

Claims

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Application Information

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IPC IPC(8): C08F4/649C08F10/06
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
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